From: Arun Thomas Date: Mon, 8 Oct 2012 01:38:03 +0000 (-0400) Subject: ARM support for kernel and vm X-Git-Tag: v3.2.1~296 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doxygen.png?a=commitdiff_plain;h=471a03a362f61654bd004388cde07b4cc9211755;p=minix.git ARM support for kernel and vm --- diff --git a/include/arch/arm/include/vm.h b/include/arch/arm/include/vm.h index 974ce4743..3800d907b 100644 --- a/include/arch/arm/include/vm.h +++ b/include/arch/arm/include/vm.h @@ -116,7 +116,14 @@ arm/vm.h */ #define ARM_VM_PFE_TLB_CONFLICT 0x10 /* Caused by TLB conflict abort */ -#define ARM_VM_PFE_W (1<<11) /* Caused by write (otherwise read) */ + +#define ARM_VM_PFE_W (1<<11) /* Caused by write (otherwise read) */ +#define ARM_VM_PFE_FS4 (1<<10) /* Fault status (bit 4) */ +#define ARM_VM_PFE_FS3_0 0xf /* Fault status (bits 3:0) */ + +/* Fault status */ +#define ARM_VM_PFE_FS(s) \ + ((((s) & ARM_VM_PFE_FS4) >> 6) | ((s) & ARM_VM_PFE_FS3_0)) #ifndef __ASSEMBLY__ diff --git a/kernel/arch/arm/Makefile.inc b/kernel/arch/arm/Makefile.inc new file mode 100644 index 000000000..dca10e47a --- /dev/null +++ b/kernel/arch/arm/Makefile.inc @@ -0,0 +1,58 @@ + +# Makefile for arch-dependent kernel code +.include + +HERE=${.CURDIR}/arch/${MACHINE_ARCH} +.PATH: ${HERE} + +# objects we want unpaged from -lminlib, -lminc +MINLIB_OBJS_UNPAGED=get_bp.o +MINC_OBJS_UNPAGED=strcat.o strlen.o memcpy.o strcpy.o strncmp.o memset.o \ + memmove.o strcmp.o atoi.o ctype_.o _stdfile.o strtol.o _errno.o errno.o +# udivdi3.o umoddi3.o qdivrem.o +SYS_OBJS_UNPAGED=kprintf.o vprintf.o assert.o stacktrace.o +LIBGCC_OBJS_UNPAGED=_divsi3.o _udivsi3.o _divdi3.o _udivdi3.o _umoddi3.o \ + _dvmd_tls.o _aeabi_uldivmod.o _clzsi2.o bpabi.o + +# some object files we give a symbol prefix (or namespace) of __k_unpaged_ +# that must live in their own unique namespace. +# +.for UNPAGED_OBJ in head.o pre_init.o direct_tty_utils.o \ + pg_utils.o klib.o omap_serial.o utility.o arch_reset.o \ + $(MINLIB_OBJS_UNPAGED) $(MINC_OBJS_UNPAGED) $(SYS_OBJS_UNPAGED) $(LIBGCC_OBJS_UNPAGED) +unpaged_${UNPAGED_OBJ}: ${UNPAGED_OBJ} + ${OBJCOPY} --prefix-symbols=__k_unpaged_ ${UNPAGED_OBJ} unpaged_${UNPAGED_OBJ} +UNPAGED_OBJS += unpaged_${UNPAGED_OBJ} +ORIG_UNPAGED_OBJS += ${UNPAGED_OBJ} +.endfor + +# we have to extract some object files from libminc.a and libminlib.a +$(MINLIB_OBJS_UNPAGED) $(MINC_OBJS_UNPAGED) $(SYS_OBJS_UNPAGED) $(LIBGCC_OBJS_UNPAGED): $(LIBMINLIB) $(LIBMINC) $(LIBSYS) $(LIBGCC) + ${AR} x $(LIBMINLIB) $(MINLIB_OBJS_UNPAGED) + ${AR} x $(LIBMINC) $(MINC_OBJS_UNPAGED) + ${AR} x $(LIBSYS) $(SYS_OBJS_UNPAGED) + ${AR} x $(LIBGCC) $(LIBGCC_OBJS_UNPAGED) + +CLEANFILES+= $(ORIG_UNPAGED_OBJS) + +SRCS+= mpx.S arch_clock.c arch_do_vmctl.c arch_system.c \ + omap_serial.c omap_timer.c omap_intr.c exception.c \ + io_intr.S klib.S memory.c \ + protect.c direct_tty_utils.c arch_reset.c \ + pg_utils.c phys_copy.S phys_memset.S exc.S +OBJS.kernel+= ${UNPAGED_OBJS} + +klib.d mpx.d head.d: procoffsets.h + +# It's OK to hardcode the arch as arm here as this and procoffsets.cf +# are arm-specific. +TMP=procoffsets.h.tmp +INCLS=../include/arch/arm/include/ +PROCOFFSETSCF=procoffsets.cf + +procoffsets.h: $(PROCOFFSETSCF) kernel.h proc.h $(INCLS)/stackframe.h $(INCLS)/archtypes.h + ${_MKTARGET_CREATE} + cat ${HERE}/$(PROCOFFSETSCF) | \ + ${TOOL_GENASSYM} -- ${CC} ${CFLAGS} ${CPPFLAGS} ${PROF} >$TMP && \ + mv -f $TMP $@ + diff --git a/kernel/arch/arm/arch_clock.c b/kernel/arch/arm/arch_clock.c new file mode 100644 index 000000000..03759638d --- /dev/null +++ b/kernel/arch/arm/arch_clock.c @@ -0,0 +1,141 @@ + +/* ARM-specific clock functions. */ + +#include "kernel/kernel.h" + +#include "kernel/clock.h" +#include "kernel/proc.h" +#include "kernel/interrupt.h" +#include +#include "glo.h" +#include "profile.h" + + +#include "spinlock.h" + +#ifdef CONFIG_SMP +#include "kernel/smp.h" +#endif + +#include "omap_timer.h" +#include "omap_intr.h" + +static unsigned tsc_per_ms[CONFIG_MAX_CPUS]; + +int init_local_timer(unsigned freq) +{ + omap3_timer_init(freq); + /* always only 1 cpu in the system */ + tsc_per_ms[0] = 1; + + return 0; +} + +void stop_local_timer(void) +{ + omap3_timer_stop(); +} + +void arch_timer_int_handler(void) +{ + omap3_timer_int_handler(); +} + +void cycles_accounting_init(void) +{ + read_tsc_64(get_cpu_var_ptr(cpu, tsc_ctr_switch)); + + make_zero64(get_cpu_var(cpu, cpu_last_tsc)); + make_zero64(get_cpu_var(cpu, cpu_last_idle)); +} + +void context_stop(struct proc * p) +{ + u64_t tsc, tsc_delta; + u64_t * __tsc_ctr_switch = get_cpulocal_var_ptr(tsc_ctr_switch); + + read_tsc_64(&tsc); + p->p_cycles = add64(p->p_cycles, sub64(tsc, *__tsc_ctr_switch)); + + tsc_delta = sub64(tsc, *__tsc_ctr_switch); + + if(kbill_ipc) { + kbill_ipc->p_kipc_cycles = + add64(kbill_ipc->p_kipc_cycles, tsc_delta); + kbill_ipc = NULL; + } + + if(kbill_kcall) { + kbill_kcall->p_kcall_cycles = + add64(kbill_kcall->p_kcall_cycles, tsc_delta); + kbill_kcall = NULL; + } + + /* + * deduct the just consumed cpu cycles from the cpu time left for this + * process during its current quantum. Skip IDLE and other pseudo kernel + * tasks + */ + if (p->p_endpoint >= 0) { +#if DEBUG_RACE + make_zero64(p->p_cpu_time_left); +#else + /* if (tsc_delta < p->p_cpu_time_left) in 64bit */ + if (ex64hi(tsc_delta) < ex64hi(p->p_cpu_time_left) || + (ex64hi(tsc_delta) == ex64hi(p->p_cpu_time_left) && + ex64lo(tsc_delta) < ex64lo(p->p_cpu_time_left))) + { + p->p_cpu_time_left = sub64(p->p_cpu_time_left, tsc_delta); + } + else { + make_zero64(p->p_cpu_time_left); + } +#endif + } + + *__tsc_ctr_switch = tsc; +} + +void context_stop_idle(void) +{ + int is_idle; +#ifdef CONFIG_SMP + unsigned cpu = cpuid; +#endif + + is_idle = get_cpu_var(cpu, cpu_is_idle); + get_cpu_var(cpu, cpu_is_idle) = 0; + + context_stop(get_cpulocal_var_ptr(idle_proc)); + + if (is_idle) + restart_local_timer(); +#if SPROFILE + if (sprofiling) + get_cpulocal_var(idle_interrupted) = 1; +#endif +} + +void restart_local_timer(void) +{ +} + +int register_local_timer_handler(const irq_handler_t handler) +{ + return omap3_register_timer_handler(handler); +} + +u64_t ms_2_cpu_time(unsigned ms) +{ + return mul64u(tsc_per_ms[cpuid], ms); +} + +unsigned cpu_time_2_ms(u64_t cpu_time) +{ + return div64u(cpu_time, tsc_per_ms[cpuid]); +} + +short cpu_load(void) +{ + return 0; +} diff --git a/kernel/arch/arm/arch_do_vmctl.c b/kernel/arch/arm/arch_do_vmctl.c new file mode 100644 index 000000000..26f563d95 --- /dev/null +++ b/kernel/arch/arm/arch_do_vmctl.c @@ -0,0 +1,58 @@ +/* The kernel call implemented in this file: + * m_type: SYS_VMCTL + * + * The parameters for this kernel call are: + * SVMCTL_WHO which process + * SVMCTL_PARAM set this setting (VMCTL_*) + * SVMCTL_VALUE to this value + */ + +#include "kernel/system.h" +#include +#include + +#include "arch_proto.h" + +static void set_ttbr(struct proc *p, u32_t ttbr, u32_t *v) +{ + /* Set process TTBR. */ + p->p_seg.p_ttbr = ttbr; + assert(p->p_seg.p_ttbr); + p->p_seg.p_ttbr_v = v; + if(p == get_cpulocal_var(ptproc)) { + write_ttbr0(p->p_seg.p_ttbr); + } + if(p->p_nr == VM_PROC_NR) { + if (arch_enable_paging(p) != OK) + panic("arch_enable_paging failed"); + } + RTS_UNSET(p, RTS_VMINHIBIT); +} + +/*===========================================================================* + * arch_do_vmctl * + *===========================================================================*/ +int arch_do_vmctl(m_ptr, p) +register message *m_ptr; /* pointer to request message */ +struct proc *p; +{ + switch(m_ptr->SVMCTL_PARAM) { + case VMCTL_GET_PDBR: + /* Get process page directory base reg (TTBR). */ + m_ptr->SVMCTL_VALUE = p->p_seg.p_ttbr; + return OK; + case VMCTL_SETADDRSPACE: + set_ttbr(p, m_ptr->SVMCTL_PTROOT, (u32_t *) m_ptr->SVMCTL_PTROOT_V); + return OK; + case VMCTL_FLUSHTLB: + { + reload_ttbr0(); + return OK; + } + } + + + + printf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM); + return EINVAL; +} diff --git a/kernel/arch/arm/arch_reset.c b/kernel/arch/arm/arch_reset.c new file mode 100644 index 000000000..66232ba09 --- /dev/null +++ b/kernel/arch/arm/arch_reset.c @@ -0,0 +1,45 @@ + +#include "kernel/kernel.h" + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "archconst.h" +#include "arch_proto.h" +#include "serial.h" +#include "kernel/proc.h" +#include "kernel/debug.h" +#include "direct_utils.h" +#include + +void halt_cpu(void) +{ + asm volatile("dsb"); + asm volatile("wfi"); +} + +void +reset(void) +{ + while (1); +} + +__dead void arch_shutdown(int how) +{ + while (1); +} + +#ifdef DEBUG_SERIAL +void ser_putc(char c) +{ + omap3_ser_putc(c); +} + +#endif diff --git a/kernel/arch/arm/arch_system.c b/kernel/arch/arm/arch_system.c new file mode 100644 index 000000000..7e1922495 --- /dev/null +++ b/kernel/arch/arm/arch_system.c @@ -0,0 +1,182 @@ +/* system dependent functions for use inside the whole kernel. */ + +#include "kernel/kernel.h" + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "archconst.h" +#include "arch_proto.h" +#include "serial.h" +#include "kernel/proc.h" +#include "kernel/debug.h" + +#include "glo.h" + +void * k_stacks; + +static void ser_init(void); + +void fpu_init(void) +{ +} + +void save_local_fpu(struct proc *pr, int retain) +{ +} + +void save_fpu(struct proc *pr) +{ +} + +void arch_proc_reset(struct proc *pr) +{ + assert(pr->p_nr < NR_PROCS); + + /* Clear process state. */ + memset(&pr->p_reg, 0, sizeof(pr->p_reg)); + if(iskerneln(pr->p_nr)) + pr->p_reg.psr = INIT_TASK_PSR; + else + pr->p_reg.psr = INIT_PSR; +} + +void arch_proc_setcontext(struct proc *p, struct stackframe_s *state, int isuser) +{ +} + +void arch_set_secondary_ipc_return(struct proc *p, u32_t val) +{ + p->p_reg.r1 = val; +} + +int restore_fpu(struct proc *pr) +{ + return 0; +} + +void cpu_identify(void) +{ + u32_t midr; + unsigned cpu = cpuid; + + asm volatile("mrc p15, 0, %[midr], c0, c0, 0 @ read MIDR\n\t" + : [midr] "=r" (midr)); + + cpu_info[cpu].implementer = midr >> 24; + cpu_info[cpu].variant = (midr >> 20) & 0xF; + cpu_info[cpu].arch = (midr >> 16) & 0xF; + cpu_info[cpu].part = (midr >> 4) & 0xFFF; + cpu_info[cpu].revision = midr & 0xF; +} + +void arch_init(void) +{ + k_stacks = (void*) &k_stacks_start; + assert(!((vir_bytes) k_stacks % K_STACK_SIZE)); + +#ifndef CONFIG_SMP + /* + * use stack 0 and cpu id 0 on a single processor machine, SMP + * configuration does this in smp_init() for all cpus at once + */ + tss_init(0, get_k_stack_top(0)); +#endif + + ser_init(); +} + +/*===========================================================================* + * do_ser_debug * + *===========================================================================*/ +void do_ser_debug() +{ +} + +void arch_do_syscall(struct proc *proc) +{ + /* do_ipc assumes that it's running because of the current process */ + assert(proc == get_cpulocal_var(proc_ptr)); + /* Make the system call, for real this time. */ + proc->p_reg.retreg = + do_ipc(proc->p_reg.retreg, proc->p_reg.r1, proc->p_reg.r2); +} + +reg_t svc_stack; + +struct proc * arch_finish_switch_to_user(void) +{ + char * stk; + struct proc * p; + +#ifdef CONFIG_SMP + stk = (char *)tss[cpuid].sp0; +#else + stk = (char *)tss[0].sp0; +#endif + svc_stack = (reg_t)stk; + /* set pointer to the process to run on the stack */ + p = get_cpulocal_var(proc_ptr); + *((reg_t *)stk) = (reg_t) p; + + /* make sure I bit is clear in PSR so that interrupts won't be disabled + * once p's context is restored. this should not be possible. + */ + assert(!(p->p_reg.psr & PSR_I)); + + return p; +} + +void fpu_sigcontext(struct proc *pr, struct sigframe *fr, struct sigcontext *sc) +{ +} + +reg_t arch_get_sp(struct proc *p) { return p->p_reg.sp; } + +void get_randomness(struct k_randomness *rand, int source) +{ +} + +static void ser_init(void) +{ +} + +/*===========================================================================*/ +/* __switch_address_space */ +/*===========================================================================*/ +/* + * sets the ttbr register to the supplied value if it is not already set to the + * same value in which case it would only result in an extra TLB flush which is + * not desirable + */ +void __switch_address_space(struct proc *p, struct proc **__ptproc) +{ + reg_t orig_ttbr, new_ttbr; + + new_ttbr = p->p_seg.p_ttbr; + if (new_ttbr == 0) + return; + + orig_ttbr = read_ttbr0(); + + /* + * test if ttbr is loaded with the current value to avoid unnecessary + * TLB flushes + */ + if (new_ttbr == orig_ttbr) + return; + + refresh_tlb(); + write_ttbr0(new_ttbr); + + *__ptproc = p; + + return; +} diff --git a/kernel/arch/arm/direct_tty_utils.c b/kernel/arch/arm/direct_tty_utils.c new file mode 100644 index 000000000..9862cf273 --- /dev/null +++ b/kernel/arch/arm/direct_tty_utils.c @@ -0,0 +1,42 @@ + +#include "kernel.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include "string.h" +#include "arch_proto.h" +#include "libexec.h" +#include "direct_utils.h" +#include "serial.h" +#include "glo.h" +#include + +void direct_cls(void) +{ + /* Do nothing */ +} + +void direct_print_char(char c) +{ + if(c == '\n') + ser_putc('\r'); + ser_putc(c); +} + +void direct_print(const char *str) +{ + while (*str) { + direct_print_char(*str); + str++; + } +} + +int direct_read_char(unsigned char *ch) +{ + return 0; +} diff --git a/kernel/arch/arm/exc.S b/kernel/arch/arm/exc.S new file mode 100644 index 000000000..743102cb2 --- /dev/null +++ b/kernel/arch/arm/exc.S @@ -0,0 +1,22 @@ +#include + +IMPORT(undefined_inst_entry) +IMPORT(svc_entry) +IMPORT(prefetch_abort_entry) +IMPORT(data_abort_entry) +IMPORT(irq_entry) + +.text +.balign 4096 +LABEL(exc_vector_table) + ldr pc, =invalid_exc /* Reset */ + ldr pc, =undefined_inst_entry /* Undefined Instruction */ + ldr pc, =svc_entry /* Supervisor Call */ + ldr pc, =prefetch_abort_entry /* Prefetch Abort */ + ldr pc, =data_abort_entry /* Data Abort */ + ldr pc, =invalid_exc /* Hypervisor Call */ + ldr pc, =irq_entry /* Interrupt */ + ldr pc, =invalid_exc /* Fast Interrupt */ + +ENTRY(invalid_exc) + b . diff --git a/kernel/arch/arm/exception.c b/kernel/arch/arm/exception.c new file mode 100644 index 000000000..416dacb2e --- /dev/null +++ b/kernel/arch/arm/exception.c @@ -0,0 +1,223 @@ +/* This file contains a simple exception handler. Exceptions in user + * processes are converted to signals. Exceptions in a kernel task cause + * a panic. + */ + +#include "kernel/kernel.h" +#include "arch_proto.h" +#include +#include +#include +#include "kernel/proc.h" +#include "kernel/proto.h" +#include + +struct ex_s { + char *msg; + int signum; +}; + +static struct ex_s ex_data[] = { + { "Reset", 0}, + { "Undefined instruction", SIGILL}, + { "Supervisor call", 0}, + { "Prefetch Abort", SIGILL}, + { "Data Abort", SIGSEGV}, + { "Hypervisor call", 0}, + { "Interrupt", 0}, + { "Fast Interrupt", 0}, +}; + +static void inkernel_disaster(struct proc *saved_proc, + reg_t *saved_lr, struct ex_s *ep, int is_nested); + +extern int catch_pagefaults; + +static void proc_stacktrace_execute(struct proc *whichproc, reg_t v_bp, reg_t pc); + +static void pagefault( struct proc *pr, + reg_t *saved_lr, + int is_nested) +{ + int in_physcopy = 0, in_memset = 0; + + reg_t pagefault_addr, pagefault_status; + message m_pagefault; + int err; + + pagefault_addr = read_dfar(); + pagefault_status = read_dfsr(); + +#if 0 + printf("kernel: pagefault in pr %d, addr 0x%lx, his ttbr 0x%lx, actual ttbr 0x%lx\n", + pr->p_endpoint, pagefault_addr, pr->p_seg.p_ttbr, read_ttbr0()); +#endif + + in_physcopy = (*saved_lr > (vir_bytes) phys_copy) && + (*saved_lr < (vir_bytes) phys_copy_fault); + + in_memset = (*saved_lr > (vir_bytes) phys_memset) && + (*saved_lr < (vir_bytes) memset_fault); + + if((is_nested || iskernelp(pr)) && + catch_pagefaults && (in_physcopy || in_memset)) { +#if 0 + printf("pf caught! addr 0x%lx\n", pagefault_addr); +#endif + if (is_nested) { + if(in_physcopy) { + assert(!in_memset); + *saved_lr = (reg_t) phys_copy_fault_in_kernel; + } else { + *saved_lr = (reg_t) memset_fault_in_kernel; + } + } + else { + pr->p_reg.pc = (reg_t) phys_copy_fault; + pr->p_reg.retreg = pagefault_addr; + } + + return; + } + + if(is_nested) { + printf("pagefault in kernel at pc 0x%lx address 0x%lx\n", + *saved_lr, pagefault_addr); + inkernel_disaster(pr, saved_lr, NULL, is_nested); + } + + /* VM can't handle page faults. */ + if(pr->p_endpoint == VM_PROC_NR) { + /* Page fault we can't / don't want to + * handle. + */ + printf("pagefault for VM on CPU %d, " + "pc = 0x%x, addr = 0x%x, flags = 0x%x, is_nested %d\n", + cpuid, pr->p_reg.pc, pagefault_addr, pagefault_status, + is_nested); + proc_stacktrace(pr); + printf("pc of pagefault: 0x%lx\n", pr->p_reg.pc); + panic("pagefault in VM"); + + return; + } + + /* Don't schedule this process until pagefault is handled. */ + RTS_SET(pr, RTS_PAGEFAULT); + + /* tell Vm about the pagefault */ + m_pagefault.m_source = pr->p_endpoint; + m_pagefault.m_type = VM_PAGEFAULT; + m_pagefault.VPF_ADDR = pagefault_addr; + m_pagefault.VPF_FLAGS = pagefault_status; + + if ((err = mini_send(pr, VM_PROC_NR, + &m_pagefault, FROM_KERNEL))) { + panic("WARNING: pagefault: mini_send returned %d\n", err); + } + + return; +} + +static void inkernel_disaster(struct proc *saved_proc, + reg_t *saved_lr, struct ex_s *ep, + int is_nested) +{ +#if USE_SYSDEBUG + if(ep) + printf("\n%s\n", ep->msg); + + printf("cpu %d is_nested = %d ", cpuid, is_nested); + + if (saved_proc) { + printf("scheduled was: process %d (%s), ", saved_proc->p_endpoint, saved_proc->p_name); + printf("pc = 0x%x\n", (unsigned) saved_proc->p_reg.pc); + proc_stacktrace(saved_proc); + + panic("Unhandled kernel exception"); + } + + /* in an early stage of boot process we don't have processes yet */ + panic("exception in kernel while booting, no saved_proc yet"); + +#endif /* USE_SYSDEBUG */ +} + +void exception_handler(int is_nested, reg_t *saved_lr, int vector) +{ +/* An exception or unexpected interrupt has occurred. */ + struct ex_s *ep; + struct proc *saved_proc; + + saved_proc = get_cpulocal_var(proc_ptr); + + ep = &ex_data[vector]; + + /* + * handle special cases for nested problems as they might be tricky or filter + * them out quickly if the traps are not nested + */ + if (is_nested) { + /* + * if a problem occured while copying a message from userspace because + * of a wrong pointer supplied by userland, handle it the only way we + * can handle it ... + */ + if (((void*)*saved_lr >= (void*)copy_msg_to_user && + (void*)*saved_lr <= (void*)__copy_msg_to_user_end) || + ((void*)*saved_lr >= (void*)copy_msg_from_user && + (void*)*saved_lr <= (void*)__copy_msg_from_user_end)) { + switch(vector) { + /* these error are expected */ + case DATA_ABORT_VECTOR: + *saved_lr = (reg_t) __user_copy_msg_pointer_failure; + return; + default: + panic("Copy involving a user pointer failed unexpectedly!"); + } + } + } + + if (vector == DATA_ABORT_VECTOR) { + pagefault(saved_proc, saved_lr, is_nested); + return; + } + + /* If an exception occurs while running a process, the is_nested variable + * will be zero. Exceptions in interrupt handlers or system traps will make + * is_nested non-zero. + */ + if (is_nested == 0 && ! iskernelp(saved_proc)) { + cause_sig(proc_nr(saved_proc), ep->signum); + return; + } + + /* Exception in system code. This is not supposed to happen. */ + inkernel_disaster(saved_proc, saved_lr, ep, is_nested); + + panic("return from inkernel_disaster"); +} + +#if USE_SYSDEBUG +/*===========================================================================* + * proc_stacktrace_execute * + *===========================================================================*/ +static void proc_stacktrace_execute(struct proc *whichproc, reg_t v_bp, reg_t pc) +{ +} +#endif + +void proc_stacktrace(struct proc *whichproc) +{ +#if USE_SYSDEBUG + proc_stacktrace_execute(whichproc, whichproc->p_reg.fp, whichproc->p_reg.pc); +#endif /* USE_SYSDEBUG */ +} + +void enable_fpu_exception(void) +{ +} + +void disable_fpu_exception(void) +{ +} diff --git a/kernel/arch/arm/glo.h b/kernel/arch/arm/glo.h new file mode 100644 index 000000000..d12da4259 --- /dev/null +++ b/kernel/arch/arm/glo.h @@ -0,0 +1,9 @@ +#ifndef __GLO_ARM_H__ +#define __GLO_ARM_H__ + +#include "kernel/kernel.h" +#include "arch_proto.h" + +EXTERN struct tss_s tss[CONFIG_MAX_CPUS]; + +#endif /* __GLO_ARM_H__ */ diff --git a/kernel/arch/arm/head.S b/kernel/arch/arm/head.S new file mode 100644 index 000000000..5f8bd04f0 --- /dev/null +++ b/kernel/arch/arm/head.S @@ -0,0 +1,53 @@ +#include "kernel/kernel.h" /* configures the kernel */ + +/* sections */ + +#include +#include "../../kernel.h" +#include +#include +#include +#include +#include +#include "archconst.h" +#include "kernel/const.h" +#include "kernel/proc.h" +#include "sconst.h" +#include +#include + +#include "arch_proto.h" /* K_STACK_SIZE */ + +.text +/*===========================================================================*/ +/* MINIX */ +/*===========================================================================*/ +.global MINIX +MINIX: +/* this is the entry point for the MINIX kernel */ + b multiboot_init + +multiboot_init: + ldr sp, =load_stack_start /* make usable stack */ + mov fp, #0 + bl _C_LABEL(pre_init) + + /* Kernel is mapped high now and ready to go, with + * the boot info pointer returned in r0. Set the + * highly mapped stack, initialize it, push the boot + * info pointer and jump to the highly mapped kernel. + */ + ldr sp, =k_initial_stktop + mov r1, #0 + push {r1} /* Terminate stack */ + /* r0 holds kinfo_t ptr */ + bl _C_LABEL(kmain) + + /* not reached */ +hang: + b hang + +.data +load_stack: + .space 4096 +load_stack_start: diff --git a/kernel/arch/arm/include/arch_clock.h b/kernel/arch/arm/include/arch_clock.h new file mode 100644 index 000000000..21574aae5 --- /dev/null +++ b/kernel/arch/arm/include/arch_clock.h @@ -0,0 +1,6 @@ +#ifndef __CLOCK_ARM_H__ +#define __CLOCK_ARM_H__ + +void arch_timer_int_handler(void); + +#endif /* __CLOCK_ARM_H__ */ diff --git a/kernel/arch/arm/include/arch_proto.h b/kernel/arch/arm/include/arch_proto.h new file mode 100644 index 000000000..f0ae853b9 --- /dev/null +++ b/kernel/arch/arm/include/arch_proto.h @@ -0,0 +1,61 @@ + +#ifndef _ARM_PROTO_H +#define _ARM_PROTO_H + +#include + +#define K_STACK_SIZE ARM_PAGE_SIZE + + +#ifndef __ASSEMBLY__ + +#include "cpufunc.h" + +/* klib */ +__dead void reset(void); +phys_bytes vir2phys(void *); +vir_bytes phys_memset(phys_bytes ph, u32_t c, phys_bytes bytes); + +void __switch_address_space(struct proc *p, struct proc **__ptproc); +#define switch_address_space(proc) \ + __switch_address_space(proc, get_cpulocal_var_ptr(ptproc)) + +void __copy_msg_from_user_end(void); +void __copy_msg_to_user_end(void); +void __user_copy_msg_pointer_failure(void); + +/* multiboot.c */ +void multiboot_init(void); + +/* protect.c */ +struct tss_s { + reg_t sp0; /* stack pointer to use during interrupt */ +} __attribute__((packed)); +int tss_init(unsigned cpu, void * kernel_stack); + +void add_memmap(kinfo_t *cbi, u64_t addr, u64_t len); +phys_bytes alloc_lowest(kinfo_t *cbi, phys_bytes len); +void vm_enable_paging(void); +void cut_memmap(kinfo_t *cbi, phys_bytes start, phys_bytes end); +phys_bytes pg_roundup(phys_bytes b); +void pg_info(reg_t *, u32_t **); +void pg_clear(void); +void pg_identity(kinfo_t *); +phys_bytes pg_load(void); +void pg_map(phys_bytes phys, vir_bytes vaddr, vir_bytes vaddr_end, kinfo_t *cbi); +int pg_mapkernel(void); +void pg_mapproc(struct proc *p, struct boot_image *ip, kinfo_t *cbi); + +EXTERN void * k_stacks_start; +extern void * k_stacks; + +#define get_k_stack_top(cpu) ((void *)(((char*)(k_stacks)) \ + + 2 * ((cpu) + 1) * K_STACK_SIZE)) + + +/* functions defined in architecture-independent kernel source. */ +#include "kernel/proto.h" + +#endif /* __ASSEMBLY__ */ + +#endif diff --git a/kernel/arch/arm/include/arch_watchdog.h b/kernel/arch/arm/include/arch_watchdog.h new file mode 100644 index 000000000..2e6f73346 --- /dev/null +++ b/kernel/arch/arm/include/arch_watchdog.h @@ -0,0 +1,6 @@ +#ifndef __ARM_WATCHDOG_H__ +#define __ARM_WATCHDOG_H__ + +#include "kernel/kernel.h" + +#endif /* __ARM_WATCHDOG_H__ */ diff --git a/kernel/arch/arm/include/archconst.h b/kernel/arch/arm/include/archconst.h new file mode 100644 index 000000000..48307638b --- /dev/null +++ b/kernel/arch/arm/include/archconst.h @@ -0,0 +1,31 @@ + +#ifndef _ARM_ACONST_H +#define _ARM_ACONST_H + +#include +#include +#include + +/* Program stack words and masks. */ +#define INIT_PSR (MODE_USR | PSR_F) /* initial psr */ +#define INIT_TASK_PSR (MODE_SVC | PSR_F) /* initial psr for tasks */ + +/* Exception vector numbers */ +#define RESET_VECTOR 0 +#define UNDEFINED_INST_VECTOR 1 +#define SUPERVISOR_CALL_VECTOR 2 +#define PREFETCH_ABORT_VECTOR 3 +#define DATA_ABORT_VECTOR 4 +#define HYPERVISOR_CALL_VECTOR 5 +#define INTERRUPT_VECTOR 6 +#define FAST_INTERRUPT_VECTOR 7 + +/* + * defines how many bytes are reserved at the top of the kernel stack for global + * information like currently scheduled process or current cpu id + */ +#define ARM_STACK_TOP_RESERVED (2 * sizeof(reg_t)) + +#define PG_ALLOCATEME ((phys_bytes)-1) + +#endif /* _ARM_ACONST_H */ diff --git a/kernel/arch/arm/include/cpufunc.h b/kernel/arch/arm/include/cpufunc.h new file mode 100644 index 000000000..37366204d --- /dev/null +++ b/kernel/arch/arm/include/cpufunc.h @@ -0,0 +1,273 @@ +#ifndef _ARM_CPUFUNC_H +#define _ARM_CPUFUNC_H + +/* Data memory barrier */ +static inline void dmb(void) +{ + asm volatile("dmb" : : : "memory"); +} + +/* Data synchronization barrier */ +static inline void dsb(void) +{ + asm volatile("dsb" : : : "memory"); +} + +/* Instruction synchronization barrier */ +static inline void isb(void) +{ + asm volatile("isb" : : : "memory"); +} + +static inline void barrier(void) +{ + dsb(); + isb(); +} + +static inline void refresh_tlb(void) +{ + dsb(); + /* Invalidate entire unified TLB */ + asm volatile("mcr p15, 0, r0, c8, c7, 0 @ TLBIALL\n\t"); + dsb(); + isb(); +} + + +/* Read System Control Register */ +static inline u32_t read_sctlr() +{ + u32_t ctl; + + asm volatile("mrc p15, 0, %[ctl], c1, c0, 0 @ Read SCTLR\n\t" + : [ctl] "=r" (ctl)); + return ctl; +} + +/* Write System Control Register */ +static inline void write_sctlr(u32_t ctl) +{ + asm volatile("mcr p15, 0, %[ctl], c1, c0, 0 @ Write SCTLR\n\t" + : : [ctl] "r" (ctl)); +} + +/* Read Translation Table Base Register 0 */ +static inline u32_t read_ttbr0() +{ + u32_t bar; + + asm volatile("mrc p15, 0, %[bar], c2, c0, 0 @ Read TTBR0\n\t" + : [bar] "=r" (bar)); + return bar; +} + +/* Write Translation Table Base Register 0 */ +static inline void write_ttbr0(u32_t bar) +{ + barrier(); + asm volatile("mcr p15, 0, %[bar], c2, c0, 0 @ Write TTBR0\n\t" + : : [bar] "r" (bar)); + refresh_tlb(); +} + +/* Reload Translation Table Base Register 0 */ +static inline void reload_ttbr0(void) +{ + reg_t ttbr = read_ttbr0(); + write_ttbr0(ttbr); + refresh_tlb(); +} + +/* Read Translation Table Base Register 1 */ +static inline u32_t read_ttbr1() +{ + u32_t bar; + + asm volatile("mrc p15, 0, %[bar], c2, c0, 1 @ Read TTBR1\n\t" + : [bar] "=r" (bar)); + return bar; +} + +/* Write Translation Table Base Register 1 */ +static inline void write_ttbr1(u32_t bar) +{ + barrier(); + asm volatile("mcr p15, 0, %[bar], c2, c0, 1 @ Write TTBR1\n\t" + : : [bar] "r" (bar)); + refresh_tlb(); +} + +/* Reload Translation Table Base Register 1 */ +static inline void reload_ttbr1(void) +{ + reg_t ttbr = read_ttbr1(); + write_ttbr1(ttbr); + refresh_tlb(); +} + +/* Read Translation Table Base Control Register */ +static inline u32_t read_ttbcr() +{ + u32_t bcr; + + asm volatile("mrc p15, 0, %[bcr], c2, c0, 2 @ Read TTBCR\n\t" + : [bcr] "=r" (bcr)); + return bcr; +} + +/* Write Translation Table Base Control Register */ +static inline void write_ttbcr(u32_t bcr) +{ + asm volatile("mcr p15, 0, %[bcr], c2, c0, 2 @ Write TTBCR\n\t" + : : [bcr] "r" (bcr)); +} + +/* Read Domain Access Control Register */ +static inline u32_t read_dacr() +{ + u32_t dacr; + + asm volatile("mrc p15, 0, %[dacr], c3, c0, 0 @ Read DACR\n\t" + : [dacr] "=r" (dacr)); + return dacr; +} + +/* Write Domain Access Control Register */ +static inline void write_dacr(u32_t dacr) +{ + asm volatile("mcr p15, 0, %[dacr], c3, c0, 0 @ Write DACR\n\t" + : : [dacr] "r" (dacr)); +} + +/* Read Data Fault Status Register */ +static inline u32_t read_dfsr() +{ + u32_t fsr; + + asm volatile("mrc p15, 0, %[fsr], c5, c0, 0 @ Read DFSR\n\t" + : [fsr] "=r" (fsr)); + return fsr; +} + +/* Write Data Fault Status Register */ +static inline void write_dfsr(u32_t fsr) +{ + asm volatile("mcr p15, 0, %[fsr], c5, c0, 0 @ Write DFSR\n\t" + : : [fsr] "r" (fsr)); +} + +/* Read Instruction Fault Status Register */ +static inline u32_t read_ifsr() +{ + u32_t fsr; + + asm volatile("mrc p15, 0, %[fsr], c5, c0, 1 @ Read IFSR\n\t" + : [fsr] "=r" (fsr)); + return fsr; +} + +/* Write Instruction Fault Status Register */ +static inline void write_ifsr(u32_t fsr) +{ + asm volatile("mcr p15, 0, %[fsr], c5, c0, 1 @ Write IFSR\n\t" + : : [fsr] "r" (fsr)); +} + +/* Read Data Fault Address Register */ +static inline u32_t read_dfar() +{ + u32_t far; + + asm volatile("mrc p15, 0, %[far], c6, c0, 0 @ Read DFAR\n\t" + : [far] "=r" (far)); + return far; +} + +/* Write Data Fault Address Register */ +static inline void write_dfar(u32_t far) +{ + asm volatile("mcr p15, 0, %[far], c6, c0, 0 @ Write DFAR\n\t" + : : [far] "r" (far)); +} + +/* Read Instruction Fault Address Register */ +static inline u32_t read_ifar() +{ + u32_t far; + + asm volatile("mrc p15, 0, %[far], c6, c0, 2 @ Read IFAR\n\t" + : [far] "=r" (far)); + return far; +} + +/* Write Instruction Fault Address Register */ +static inline void write_ifar(u32_t far) +{ + asm volatile("mcr p15, 0, %[far], c6, c0, 2 @ Write IFAR\n\t" + : : [far] "r" (far)); +} + +/* Read Vector Base Address Register */ +static inline u32_t read_vbar() +{ + u32_t vbar; + + asm volatile("mrc p15, 0, %[vbar], c12, c0, 0 @ Read VBAR\n\t" + : [vbar] "=r" (vbar)); + return vbar; +} + +/* Write Vector Base Address Register */ +static inline void write_vbar(u32_t vbar) +{ + asm volatile("mcr p15, 0, %[vbar], c12, c0, 0 @ Write VBAR\n\t" + : : [vbar] "r" (vbar)); + asm volatile("dsb"); +} + +/* Read the Main ID Register */ +static inline u32_t read_midr() +{ + u32_t id; + + asm volatile("mrc p15, 0, %[id], c0, c0, 0 @ read MIDR\n\t" + : [id] "=r" (id)); + return id; +} + +/* Read Auxiliary Control Register */ +static inline u32_t read_actlr() +{ + u32_t ctl; + + asm volatile("mrc p15, 0, %[ctl], c1, c0, 1 @ Read ACTLR\n\t" + : [ctl] "=r" (ctl)); + return ctl; +} + +/* Write Auxiliary Control Register */ +static inline void write_actlr(u32_t ctl) +{ + asm volatile("mcr p15, 0, %[ctl], c1, c0, 1 @ Write ACTLR\n\t" + : : [ctl] "r" (ctl)); +} + +/* Read Current Program Status Register */ +static inline u32_t read_cpsr() +{ + u32_t status; + + asm volatile("mrs %[status], cpsr @ read CPSR" + : [status] "=r" (status)); + return status; +} + +/* Write Current Program Status Register */ +static inline void write_cpsr(u32_t status) +{ + asm volatile("msr cpsr_c, %[status] @ write CPSR" + : : [status] "r" (status)); +} + +#endif /* _ARM_CPUFUNC_H */ diff --git a/kernel/arch/arm/include/direct_utils.h b/kernel/arch/arm/include/direct_utils.h new file mode 100644 index 000000000..5b7943d74 --- /dev/null +++ b/kernel/arch/arm/include/direct_utils.h @@ -0,0 +1,11 @@ +#ifndef MB_UTILS_H +#define MB_UTILS_H + +#include "kernel/kernel.h" + +void direct_cls(void); +void direct_print(const char*); +void direct_print_char(char); +int direct_read_char(unsigned char*); + +#endif diff --git a/kernel/arch/arm/include/hw_intr.h b/kernel/arch/arm/include/hw_intr.h new file mode 100644 index 000000000..0e747c502 --- /dev/null +++ b/kernel/arch/arm/include/hw_intr.h @@ -0,0 +1,14 @@ +#ifndef __HW_INTR_ARM_H__ +#define __HW_INTR_ARM_H__ + +#include "kernel/kernel.h" +void irq_handle(int irq); + +#define hw_intr_mask(irq) omap3_irq_mask(irq) +#define hw_intr_unmask(irq) omap3_irq_unmask(irq) +#define hw_intr_ack(irq) +#define hw_intr_used(irq) +#define hw_intr_not_used(irq) +#define hw_intr_disable_all() + +#endif /* __HW_INTR_ARM_H__ */ diff --git a/kernel/arch/arm/include/io.h b/kernel/arch/arm/include/io.h new file mode 100644 index 000000000..7678148e3 --- /dev/null +++ b/kernel/arch/arm/include/io.h @@ -0,0 +1,16 @@ +#ifndef _ARM_IO_H_ +#define _ARM_IO_H_ + +#ifndef __ASSEMBLY__ + +#include + +/* Access memory-mapped I/O devices */ +#define mmio_read(a) (*(volatile u32_t *)(a)) +#define mmio_write(a,v) (*(volatile u32_t *)(a) = (v)) +#define mmio_set(a,v) mmio_write((a), mmio_read((a)) | (v)) +#define mmio_clear(a,v) mmio_write((a), mmio_read((a)) & ~(v)) + +#endif /* __ASSEMBLY__ */ + +#endif /* _ARM_IO_H_ */ diff --git a/kernel/arch/arm/io_intr.S b/kernel/arch/arm/io_intr.S new file mode 100644 index 000000000..60b420eaa --- /dev/null +++ b/kernel/arch/arm/io_intr.S @@ -0,0 +1,14 @@ +/* intr_disable(), intr_enable - Disable/Enable hardware interrupts. */ +/* void intr_disable(void); */ +/* void intr_enable(void); */ +#include + +ENTRY(intr_disable) + dsb + cpsid i + bx lr + +ENTRY(intr_enable) + dsb + cpsie i + bx lr diff --git a/kernel/arch/arm/kernel.lds b/kernel/arch/arm/kernel.lds new file mode 100644 index 000000000..b14cba49a --- /dev/null +++ b/kernel/arch/arm/kernel.lds @@ -0,0 +1,49 @@ +OUTPUT_ARCH("arm") +ENTRY(__k_unpaged_MINIX) + +_kern_phys_base = 0x80200000; /* phys 4MB aligned for convenient remapping */ +_kern_vir_base = 0xF0400000; /* map kernel high for max. user vir space */ +_kern_offset = (_kern_vir_base - _kern_phys_base); + +__k_unpaged__kern_offset = _kern_offset; +__k_unpaged__kern_vir_base = _kern_vir_base; +__k_unpaged__kern_phys_base = _kern_phys_base; + +SECTIONS +{ + . = _kern_phys_base; + __k_unpaged__kern_unpaged_start = .; + + .unpaged_text ALIGN(4096) : { unpaged_*.o(.text) } + .unpaged_data ALIGN(4096) : { unpaged_*.o(.data .rodata*) } + __k_unpaged__kern_unpaged__edata = .; + __k_unpaged__edata = .; + .unpaged_bss ALIGN(4096) : { unpaged_*.o(.bss COMMON) } + __k_unpaged__kern_unpaged_end = .; + __k_unpaged__end = .; + + . += _kern_offset; + + . = ALIGN(4096); usermapped_start = .; + .usermapped_glo : AT(ADDR(.usermapped_glo) - _kern_offset) { usermapped_glo*.o } + . = ALIGN(4096); usermapped_nonglo_start = .; + .usermapped : AT(ADDR(.usermapped) - _kern_offset) { usermapped_*.o } + . = ALIGN(4096); usermapped_end = .; + .text : AT(ADDR(.text) - _kern_offset) { *(.text*) } + _etext = .; + .data ALIGN(4096) : AT(ADDR(.data) - _kern_offset) { *(.data .rodata* ) } + . = ALIGN(4096); + _edata = .; + .bss ALIGN(4096) : AT(ADDR(.bss) - _kern_offset) { *(.bss* COMMON) + __k_unpaged__kern_size = . - _kern_vir_base; + _kern_size = __k_unpaged__kern_size; + . += 4096; + } + _end = .; + + /DISCARD/ : + { + *(.ARM.exidx*) + } + +} diff --git a/kernel/arch/arm/klib.S b/kernel/arch/arm/klib.S new file mode 100644 index 000000000..95bfa79bc --- /dev/null +++ b/kernel/arch/arm/klib.S @@ -0,0 +1,93 @@ +/* sections */ + + +#include +#include +#include +#include +#include +#include "archconst.h" +#include "kernel/const.h" +#include "sconst.h" +#include + + +/*===========================================================================*/ +/* copy_msg_from_user */ +/*===========================================================================*/ +/* + * int copy_msg_from_user(message * user_mbuf, message * dst); + * + * Copies a message of 36 bytes from user process space to a kernel buffer. This + * function assumes that the process address space is installed (cr3 loaded). + * + * This function from the callers point of view either succeeds or returns an + * error which gives the caller a chance to respond accordingly. In fact it + * either succeeds or if it generates a pagefault, general protection or other + * exception, the trap handler has to redirect the execution to + * __user_copy_msg_pointer_failure where the error is reported to the caller + * without resolving the pagefault. It is not kernel's problem to deal with + * wrong pointers from userspace and the caller should return an error to + * userspace as if wrong values or request were passed to the kernel + */ +ENTRY(copy_msg_from_user) + push {r4-r10, lr} + /* load the source pointer */ + mov r9, r0 + /* load the destination pointer */ + mov r10, r1 + /* do the copy */ + ldm r9, {r0-r8} + stm r10, {r0-r8} + +LABEL(__copy_msg_from_user_end) + pop {r4-r10, lr} + mov r0, #0 + bx lr + +/*===========================================================================*/ +/* copy_msg_to_user */ +/*===========================================================================*/ +/* + * void copy_msg_to_user(message * src, message * user_mbuf); + * + * Copies a message of 36 bytes to user process space from a kernel buffer. + * + * All the other copy_msg_from_user() comments apply here as well! + */ +ENTRY(copy_msg_to_user) + push {r4-r10, lr} + /* load the source pointer */ + mov r9, r0 + /* load the destination pointer */ + mov r10, r1 + /* do the copy */ + ldm r9, {r0-r8} + stm r10, {r0-r8} + +LABEL(__copy_msg_to_user_end) + pop {r4-r10, lr} + mov r0, #0 + bx lr + +/* + * if a function from a selected set of copies from or to userspace fails, it is + * because of a wrong pointer supplied by the userspace. We have to clean up and + * and return -1 to indicated that something wrong has happend. The place it was + * called from has to handle this situation. The exception handler redirect us + * here to continue, clean up and report the error + */ +ENTRY(__user_copy_msg_pointer_failure) + pop {r4-r10, lr} + mov r0, #-1 + bx lr + +ENTRY(interrupts_enable) + dsb + cpsie i + bx lr + +ENTRY(interrupts_disable) + dsb + cpsid i + bx lr diff --git a/kernel/arch/arm/memory.c b/kernel/arch/arm/memory.c new file mode 100644 index 000000000..2f22bb5b7 --- /dev/null +++ b/kernel/arch/arm/memory.c @@ -0,0 +1,775 @@ + +#include "kernel/kernel.h" +#include "kernel/proc.h" +#include "kernel/vm.h" + +#include + +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "arch_proto.h" +#include "kernel/proto.h" +#include "kernel/debug.h" + +phys_bytes device_mem_vaddr = 0; + +#define HASPT(procptr) ((procptr)->p_seg.p_ttbr != 0) +static int nfreepdes = 0; +#define MAXFREEPDES 2 +static int freepdes[MAXFREEPDES]; + +static u32_t phys_get32(phys_bytes v); + +void mem_clear_mapcache(void) +{ + int i; + for(i = 0; i < nfreepdes; i++) { + struct proc *ptproc = get_cpulocal_var(ptproc); + int pde = freepdes[i]; + u32_t *ptv; + assert(ptproc); + ptv = ptproc->p_seg.p_ttbr_v; + assert(ptv); + ptv[pde] = 0; + } +} + +/* This function sets up a mapping from within the kernel's address + * space to any other area of memory, either straight physical + * memory (pr == NULL) or a process view of memory, in 1MB windows. + * I.e., it maps in 1MB chunks of virtual (or physical) address space + * to 1MB chunks of kernel virtual address space. + * + * It recognizes pr already being in memory as a special case (no + * mapping required). + * + * The target (i.e. in-kernel) mapping area is one of the freepdes[] + * VM has earlier already told the kernel about that is available. It is + * identified as the 'pde' parameter. This value can be chosen freely + * by the caller, as long as it is in range (i.e. 0 or higher and corresonds + * to a known freepde slot). It is up to the caller to keep track of which + * freepde's are in use, and to determine which ones are free to use. + * + * The logical number supplied by the caller is translated into an actual + * pde number to be used, and a pointer to it (linear address) is returned + * for actual use by phys_copy or memset. + */ +static phys_bytes createpde( + const struct proc *pr, /* Requested process, NULL for physical. */ + const phys_bytes linaddr,/* Address after segment translation. */ + phys_bytes *bytes, /* Size of chunk, function may truncate it. */ + int free_pde_idx, /* index of the free slot to use */ + int *changed /* If mapping is made, this is set to 1. */ + ) +{ + u32_t pdeval; + phys_bytes offset; + int pde; + + assert(free_pde_idx >= 0 && free_pde_idx < nfreepdes); + pde = freepdes[free_pde_idx]; + assert(pde >= 0 && pde < 4096); + + if(pr && ((pr == get_cpulocal_var(ptproc)) || iskernelp(pr))) { + /* Process memory is requested, and + * it's a process that is already in current page table, or + * the kernel, which is always there. + * Therefore linaddr is valid directly, with the requested + * size. + */ + return linaddr; + } + + if(pr) { + /* Requested address is in a process that is not currently + * accessible directly. Grab the PDE entry of that process' + * page table that corresponds to the requested address. + */ + assert(pr->p_seg.p_ttbr_v); + pdeval = pr->p_seg.p_ttbr_v[ARM_VM_PDE(linaddr)]; + } else { + /* Requested address is physical. Make up the PDE entry. */ + pdeval = (linaddr & ARM_VM_SECTION_MASK) | + ARM_VM_SECTION | + ARM_VM_SECTION_DOMAIN | ARM_VM_SECTION_USER; + } + + /* Write the pde value that we need into a pde that the kernel + * can access, into the currently loaded page table so it becomes + * visible. + */ + assert(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v); + if(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v[pde] != pdeval) { + get_cpulocal_var(ptproc)->p_seg.p_ttbr_v[pde] = pdeval; + *changed = 1; + } + + /* Memory is now available, but only the 1MB window of virtual + * address space that we have mapped; calculate how much of + * the requested range is visible and return that in *bytes, + * if that is less than the requested range. + */ + offset = linaddr & ARM_VM_OFFSET_MASK_1MB; /* Offset in 1MB window. */ + *bytes = MIN(*bytes, ARM_BIG_PAGE_SIZE - offset); + + /* Return the linear address of the start of the new mapping. */ + return ARM_BIG_PAGE_SIZE*pde + offset; +} + + +/*===========================================================================* + * check_resumed_caller * + *===========================================================================*/ +static int check_resumed_caller(struct proc *caller) +{ + /* Returns the result from VM if caller was resumed, otherwise OK. */ + if (caller && (caller->p_misc_flags & MF_KCALL_RESUME)) { + assert(caller->p_vmrequest.vmresult != VMSUSPEND); + return caller->p_vmrequest.vmresult; + } + + return OK; +} + +/*===========================================================================* + * lin_lin_copy * + *===========================================================================*/ +static int lin_lin_copy(struct proc *srcproc, vir_bytes srclinaddr, + struct proc *dstproc, vir_bytes dstlinaddr, vir_bytes bytes) +{ + u32_t addr; + proc_nr_t procslot; + + assert(get_cpulocal_var(ptproc)); + assert(get_cpulocal_var(proc_ptr)); + assert(read_ttbr0() == get_cpulocal_var(ptproc)->p_seg.p_ttbr); + + procslot = get_cpulocal_var(ptproc)->p_nr; + + assert(procslot >= 0 && procslot < ARM_VM_DIR_ENTRIES); + + if(srcproc) assert(!RTS_ISSET(srcproc, RTS_SLOT_FREE)); + if(dstproc) assert(!RTS_ISSET(dstproc, RTS_SLOT_FREE)); + assert(!RTS_ISSET(get_cpulocal_var(ptproc), RTS_SLOT_FREE)); + assert(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v); + if(srcproc) assert(!RTS_ISSET(srcproc, RTS_VMINHIBIT)); + if(dstproc) assert(!RTS_ISSET(dstproc, RTS_VMINHIBIT)); + + while(bytes > 0) { + phys_bytes srcptr, dstptr; + vir_bytes chunk = bytes; + int changed = 0; + +#ifdef CONFIG_SMP + unsigned cpu = cpuid; + + if (srcproc && GET_BIT(srcproc->p_stale_tlb, cpu)) { + changed = 1; + UNSET_BIT(srcproc->p_stale_tlb, cpu); + } + if (dstproc && GET_BIT(dstproc->p_stale_tlb, cpu)) { + changed = 1; + UNSET_BIT(dstproc->p_stale_tlb, cpu); + } +#endif + + /* Set up 1MB ranges. */ + srcptr = createpde(srcproc, srclinaddr, &chunk, 0, &changed); + dstptr = createpde(dstproc, dstlinaddr, &chunk, 1, &changed); + if(changed) { + reload_ttbr0(); + refresh_tlb(); + } + /* Copy pages. */ + PHYS_COPY_CATCH(srcptr, dstptr, chunk, addr); + + if(addr) { + /* If addr is nonzero, a page fault was caught. */ + + if(addr >= srcptr && addr < (srcptr + chunk)) { + return EFAULT_SRC; + } + if(addr >= dstptr && addr < (dstptr + chunk)) { + return EFAULT_DST; + } + + panic("lin_lin_copy fault out of range"); + + /* Not reached. */ + return EFAULT; + } + + /* Update counter and addresses for next iteration, if any. */ + bytes -= chunk; + srclinaddr += chunk; + dstlinaddr += chunk; + } + + if(srcproc) assert(!RTS_ISSET(srcproc, RTS_SLOT_FREE)); + if(dstproc) assert(!RTS_ISSET(dstproc, RTS_SLOT_FREE)); + assert(!RTS_ISSET(get_cpulocal_var(ptproc), RTS_SLOT_FREE)); + assert(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v); + + return OK; +} + +static u32_t phys_get32(phys_bytes addr) +{ + const u32_t v; + int r; + + if((r=lin_lin_copy(NULL, addr, + proc_addr(SYSTEM), (phys_bytes) &v, sizeof(v))) != OK) { + panic("lin_lin_copy for phys_get32 failed: %d", r); + } + + return v; +} + +/*===========================================================================* + * umap_virtual * + *===========================================================================*/ +phys_bytes umap_virtual(rp, seg, vir_addr, bytes) +register struct proc *rp; /* pointer to proc table entry for process */ +int seg; /* T, D, or S segment */ +vir_bytes vir_addr; /* virtual address in bytes within the seg */ +vir_bytes bytes; /* # of bytes to be copied */ +{ + phys_bytes phys = 0; + + if(vm_lookup(rp, vir_addr, &phys, NULL) != OK) { + printf("SYSTEM:umap_virtual: vm_lookup of %s: seg 0x%x: 0x%lx failed\n", rp->p_name, seg, vir_addr); + phys = 0; + } else { + if(phys == 0) + panic("vm_lookup returned phys: %d", phys); + } + + if(phys == 0) { + printf("SYSTEM:umap_virtual: lookup failed\n"); + return 0; + } + + /* Now make sure addresses are contiguous in physical memory + * so that the umap makes sense. + */ + if(bytes > 0 && vm_lookup_range(rp, vir_addr, NULL, bytes) != bytes) { + printf("umap_virtual: %s: %lu at 0x%lx (vir 0x%lx) not contiguous\n", + rp->p_name, bytes, vir_addr, vir_addr); + return 0; + } + + /* phys must be larger than 0 (or the caller will think the call + * failed), and address must not cross a page boundary. + */ + assert(phys); + + return phys; +} + + +/*===========================================================================* + * vm_lookup * + *===========================================================================*/ +int vm_lookup(const struct proc *proc, const vir_bytes virtual, + phys_bytes *physical, u32_t *ptent) +{ + u32_t *root, *pt; + int pde, pte; + u32_t pde_v, pte_v; + + assert(proc); + assert(physical); + assert(!isemptyp(proc)); + assert(HASPT(proc)); + + /* Retrieve page directory entry. */ + root = (u32_t *) proc->p_seg.p_ttbr; + assert(!((u32_t) root % ARM_PAGEDIR_SIZE)); + pde = ARM_VM_PDE(virtual); + assert(pde >= 0 && pde < ARM_VM_DIR_ENTRIES); + pde_v = phys_get32((u32_t) (root + pde)); + + if(!(pde_v & ARM_VM_PDE_PRESENT)) { + return EFAULT; + } + + /* We don't expect to ever see this. */ + if(pde_v & ARM_VM_BIGPAGE) { + *physical = pde_v & ARM_VM_SECTION_MASK; + if(ptent) *ptent = pde_v; + *physical += virtual & ARM_VM_OFFSET_MASK_1MB; + } else { + /* Retrieve page table entry. */ + pt = (u32_t *) (pde_v & ARM_VM_PDE_MASK); + assert(!((u32_t) pt % ARM_PAGETABLE_SIZE)); + pte = ARM_VM_PTE(virtual); + assert(pte >= 0 && pte < ARM_VM_PT_ENTRIES); + pte_v = phys_get32((u32_t) (pt + pte)); + if(!(pte_v & ARM_VM_PTE_PRESENT)) { + return EFAULT; + } + + if(ptent) *ptent = pte_v; + + /* Actual address now known; retrieve it and add page offset. */ + *physical = pte_v & ARM_VM_PTE_MASK; + *physical += virtual % ARM_PAGE_SIZE; + } + + return OK; +} + +/*===========================================================================* + * vm_lookup_range * + *===========================================================================*/ +size_t vm_lookup_range(const struct proc *proc, vir_bytes vir_addr, + phys_bytes *phys_addr, size_t bytes) +{ + /* Look up the physical address corresponding to linear virtual address + * 'vir_addr' for process 'proc'. Return the size of the range covered + * by contiguous physical memory starting from that address; this may + * be anywhere between 0 and 'bytes' inclusive. If the return value is + * nonzero, and 'phys_addr' is non-NULL, 'phys_addr' will be set to the + * base physical address of the range. 'vir_addr' and 'bytes' need not + * be page-aligned, but the caller must have verified that the given + * linear range is valid for the given process at all. + */ + phys_bytes phys, next_phys; + size_t len; + + assert(proc); + assert(bytes > 0); + assert(HASPT(proc)); + + /* Look up the first page. */ + if (vm_lookup(proc, vir_addr, &phys, NULL) != OK) + return 0; + + if (phys_addr != NULL) + *phys_addr = phys; + + len = ARM_PAGE_SIZE - (vir_addr % ARM_PAGE_SIZE); + vir_addr += len; + next_phys = phys + len; + + /* Look up any next pages and test physical contiguity. */ + while (len < bytes) { + if (vm_lookup(proc, vir_addr, &phys, NULL) != OK) + break; + + if (next_phys != phys) + break; + + len += ARM_PAGE_SIZE; + vir_addr += ARM_PAGE_SIZE; + next_phys += ARM_PAGE_SIZE; + } + + /* We might now have overshot the requested length somewhat. */ + return MIN(bytes, len); +} + +/*===========================================================================* + * vm_suspend * + *===========================================================================*/ +static void vm_suspend(struct proc *caller, const struct proc *target, + const vir_bytes linaddr, const vir_bytes len, const int type) +{ + /* This range is not OK for this process. Set parameters + * of the request and notify VM about the pending request. + */ + assert(!RTS_ISSET(caller, RTS_VMREQUEST)); + assert(!RTS_ISSET(target, RTS_VMREQUEST)); + + RTS_SET(caller, RTS_VMREQUEST); + + caller->p_vmrequest.req_type = VMPTYPE_CHECK; + caller->p_vmrequest.target = target->p_endpoint; + caller->p_vmrequest.params.check.start = linaddr; + caller->p_vmrequest.params.check.length = len; + caller->p_vmrequest.params.check.writeflag = 1; + caller->p_vmrequest.type = type; + + /* Connect caller on vmrequest wait queue. */ + if(!(caller->p_vmrequest.nextrequestor = vmrequest)) + if(OK != send_sig(VM_PROC_NR, SIGKMEM)) + panic("send_sig failed"); + vmrequest = caller; +} + +/*===========================================================================* + * vm_check_range * + *===========================================================================*/ +int vm_check_range(struct proc *caller, struct proc *target, + vir_bytes vir_addr, size_t bytes) +{ + /* Public interface to vm_suspend(), for use by kernel calls. On behalf + * of 'caller', call into VM to check linear virtual address range of + * process 'target', starting at 'vir_addr', for 'bytes' bytes. This + * function assumes that it will called twice if VM returned an error + * the first time (since nothing has changed in that case), and will + * then return the error code resulting from the first call. Upon the + * first call, a non-success error code is returned as well. + */ + int r; + + if ((caller->p_misc_flags & MF_KCALL_RESUME) && + (r = caller->p_vmrequest.vmresult) != OK) + return r; + + vm_suspend(caller, target, vir_addr, bytes, VMSTYPE_KERNELCALL); + + return VMSUSPEND; +} + +/*===========================================================================* + * delivermsg * + *===========================================================================*/ +void delivermsg(struct proc *rp) +{ + int r = OK; + + assert(rp->p_misc_flags & MF_DELIVERMSG); + assert(rp->p_delivermsg.m_source != NONE); + + if (copy_msg_to_user(&rp->p_delivermsg, + (message *) rp->p_delivermsg_vir)) { + printf("WARNING wrong user pointer 0x%08lx from " + "process %s / %d\n", + rp->p_delivermsg_vir, + rp->p_name, + rp->p_endpoint); + r = EFAULT; + } + + /* Indicate message has been delivered; address is 'used'. */ + rp->p_delivermsg.m_source = NONE; + rp->p_misc_flags &= ~MF_DELIVERMSG; + + if(!(rp->p_misc_flags & MF_CONTEXT_SET)) { + rp->p_reg.retreg = r; + } +} + +/*===========================================================================* + * vmmemset * + *===========================================================================*/ +int vm_memset(struct proc* caller, endpoint_t who, phys_bytes ph, int c, + phys_bytes count) +{ + u32_t pattern; + struct proc *whoptr = NULL; + phys_bytes cur_ph = ph; + phys_bytes left = count; + phys_bytes ptr, chunk, pfa = 0; + int new_ttbr, r = OK; + + if ((r = check_resumed_caller(caller)) != OK) + return r; + + /* NONE for physical, otherwise virtual */ + if (who != NONE && !(whoptr = endpoint_lookup(who))) + return ESRCH; + + c &= 0xFF; + pattern = c | (c << 8) | (c << 16) | (c << 24); + + assert(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v); + assert(!catch_pagefaults); + catch_pagefaults = 1; + + /* We can memset as many bytes as we have remaining, + * or as many as remain in the 1MB chunk we mapped in. + */ + while (left > 0) { + new_ttbr = 0; + chunk = left; + ptr = createpde(whoptr, cur_ph, &chunk, 0, &new_ttbr); + + if (new_ttbr) { + reload_ttbr0(); + refresh_tlb(); + } + /* If a page fault happens, pfa is non-null */ + if ((pfa = phys_memset(ptr, pattern, chunk))) { + + /* If a process pagefaults, VM may help out */ + if (whoptr) { + vm_suspend(caller, whoptr, ph, count, + VMSTYPE_KERNELCALL); + assert(catch_pagefaults); + catch_pagefaults = 0; + return VMSUSPEND; + } + + /* Pagefault when phys copying ?! */ + panic("vm_memset: pf %lx addr=%lx len=%lu\n", + pfa , ptr, chunk); + } + + cur_ph += chunk; + left -= chunk; + } + + assert(get_cpulocal_var(ptproc)->p_seg.p_ttbr_v); + assert(catch_pagefaults); + catch_pagefaults = 0; + + return OK; +} + +/*===========================================================================* + * virtual_copy_f * + *===========================================================================*/ +int virtual_copy_f(caller, src_addr, dst_addr, bytes, vmcheck) +struct proc * caller; +struct vir_addr *src_addr; /* source virtual address */ +struct vir_addr *dst_addr; /* destination virtual address */ +vir_bytes bytes; /* # of bytes to copy */ +int vmcheck; /* if nonzero, can return VMSUSPEND */ +{ +/* Copy bytes from virtual address src_addr to virtual address dst_addr. */ + struct vir_addr *vir_addr[2]; /* virtual source and destination address */ + int i, r; + struct proc *procs[2]; + + assert((vmcheck && caller) || (!vmcheck && !caller)); + + /* Check copy count. */ + if (bytes <= 0) return(EDOM); + + /* Do some more checks and map virtual addresses to physical addresses. */ + vir_addr[_SRC_] = src_addr; + vir_addr[_DST_] = dst_addr; + + for (i=_SRC_; i<=_DST_; i++) { + endpoint_t proc_e = vir_addr[i]->proc_nr_e; + int proc_nr; + struct proc *p; + + if(proc_e == NONE) { + p = NULL; + } else { + if(!isokendpt(proc_e, &proc_nr)) { + printf("virtual_copy: no reasonable endpoint\n"); + return ESRCH; + } + p = proc_addr(proc_nr); + } + + procs[i] = p; + } + + if ((r = check_resumed_caller(caller)) != OK) + return r; + + if((r=lin_lin_copy(procs[_SRC_], vir_addr[_SRC_]->offset, + procs[_DST_], vir_addr[_DST_]->offset, bytes)) != OK) { + struct proc *target = NULL; + phys_bytes lin; + if(r != EFAULT_SRC && r != EFAULT_DST) + panic("lin_lin_copy failed: %d", r); + if(!vmcheck || !caller) { + return r; + } + + if(r == EFAULT_SRC) { + lin = vir_addr[_SRC_]->offset; + target = procs[_SRC_]; + } else if(r == EFAULT_DST) { + lin = vir_addr[_DST_]->offset; + target = procs[_DST_]; + } else { + panic("r strange: %d", r); + } + + assert(caller); + assert(target); + + vm_suspend(caller, target, lin, bytes, VMSTYPE_KERNELCALL); + return VMSUSPEND; + } + + return OK; +} + +/*===========================================================================* + * data_copy * + *===========================================================================*/ +int data_copy(const endpoint_t from_proc, const vir_bytes from_addr, + const endpoint_t to_proc, const vir_bytes to_addr, + size_t bytes) +{ + struct vir_addr src, dst; + + src.offset = from_addr; + dst.offset = to_addr; + src.proc_nr_e = from_proc; + dst.proc_nr_e = to_proc; + assert(src.proc_nr_e != NONE); + assert(dst.proc_nr_e != NONE); + + return virtual_copy(&src, &dst, bytes); +} + +/*===========================================================================* + * data_copy_vmcheck * + *===========================================================================*/ +int data_copy_vmcheck(struct proc * caller, + const endpoint_t from_proc, const vir_bytes from_addr, + const endpoint_t to_proc, const vir_bytes to_addr, + size_t bytes) +{ + struct vir_addr src, dst; + + src.offset = from_addr; + dst.offset = to_addr; + src.proc_nr_e = from_proc; + dst.proc_nr_e = to_proc; + assert(src.proc_nr_e != NONE); + assert(dst.proc_nr_e != NONE); + + return virtual_copy_vmcheck(caller, &src, &dst, bytes); +} + +void memory_init(void) +{ + assert(nfreepdes == 0); + + freepdes[nfreepdes++] = kinfo.freepde_start++; + freepdes[nfreepdes++] = kinfo.freepde_start++; + + assert(kinfo.freepde_start < ARM_VM_DIR_ENTRIES); + assert(nfreepdes == 2); + assert(nfreepdes <= MAXFREEPDES); +} + +/*===========================================================================* + * arch_proc_init * + *===========================================================================*/ +void arch_proc_init(struct proc *pr, const u32_t ip, const u32_t sp, char *name) +{ + arch_proc_reset(pr); + strcpy(pr->p_name, name); + + /* set custom state we know */ + pr->p_reg.pc = ip; + pr->p_reg.sp = sp; +} + +static int device_mem_mapping_index = -1, + usermapped_glo_index = -1, + usermapped_index = -1, first_um_idx = -1; + +char *device_mem; + +extern char usermapped_start, usermapped_end, usermapped_nonglo_start; + +int arch_phys_map(const int index, + phys_bytes *addr, + phys_bytes *len, + int *flags) +{ + static int first = 1; + int freeidx = 0; + u32_t glo_len = (u32_t) &usermapped_nonglo_start - + (u32_t) &usermapped_start; + + if(first) { + device_mem_mapping_index = freeidx++; + if(glo_len > 0) { + usermapped_glo_index = freeidx++; + } + + usermapped_index = freeidx++; + first_um_idx = usermapped_index; + if(usermapped_glo_index != -1) + first_um_idx = usermapped_glo_index; + first = 0; + } + + if(index == usermapped_glo_index) { + *addr = vir2phys(&usermapped_start); + *len = glo_len; + *flags = VMMF_USER | VMMF_GLO; + return OK; + } + else if(index == usermapped_index) { + *addr = vir2phys(&usermapped_nonglo_start); + *len = (u32_t) &usermapped_end - + (u32_t) &usermapped_nonglo_start; + *flags = VMMF_USER; + return OK; + } + else if (index == device_mem_mapping_index) { + /* map device memory */ + *addr = 0x48000000; + *len = 0x02000000; + *flags = VMMF_UNCACHED | VMMF_WRITE; + return OK; + } + + return EINVAL; +} + +int arch_phys_map_reply(const int index, const vir_bytes addr) +{ + if(index == first_um_idx) { + u32_t usermapped_offset; + assert(addr > (u32_t) &usermapped_start); + usermapped_offset = addr - (u32_t) &usermapped_start; + memset(&minix_kerninfo, 0, sizeof(minix_kerninfo)); +#define FIXEDPTR(ptr) (void *) ((u32_t)ptr + usermapped_offset) +#define FIXPTR(ptr) ptr = FIXEDPTR(ptr) +#define ASSIGN(minixstruct) minix_kerninfo.minixstruct = FIXEDPTR(&minixstruct) + ASSIGN(kinfo); + ASSIGN(machine); + ASSIGN(kmessages); + ASSIGN(loadinfo); + + /* adjust the pointers of the functions and the struct + * itself to the user-accessible mapping + */ + minix_kerninfo.kerninfo_magic = KERNINFO_MAGIC; + minix_kerninfo.minix_feature_flags = minix_feature_flags; + minix_kerninfo_user = (vir_bytes) FIXEDPTR(&minix_kerninfo); + + return OK; + } + + if(index == usermapped_index) return OK; + + if (index == device_mem_mapping_index) { + device_mem_vaddr = addr; + return OK; + } + + return EINVAL; +} + +int arch_enable_paging(struct proc * caller) +{ + assert(caller->p_seg.p_ttbr); + + /* load caller's page table */ + switch_address_space(caller); + + device_mem = (char *) device_mem_vaddr; + + return OK; +} + +void release_address_space(struct proc *pr) +{ + pr->p_seg.p_ttbr_v = NULL; + refresh_tlb(); +} diff --git a/kernel/arch/arm/mpx.S b/kernel/arch/arm/mpx.S new file mode 100644 index 000000000..d40a1fd7c --- /dev/null +++ b/kernel/arch/arm/mpx.S @@ -0,0 +1,295 @@ +/* This file is part of the lowest layer of the MINIX kernel. (The other part + * is "proc.c".) The lowest layer does process switching and message handling. + * + * Kernel is entered either because of kernel-calls, ipc-calls, interrupts or + * exceptions. TSS is set so that the kernel stack is loaded. The user context is + * saved to the proc table and the handler of the event is called. Once the + * handler is done, switch_to_user() function is called to pick a new process, + * finish what needs to be done for the next process to run, sets its context + * and switch to userspace. + */ + +#include "kernel/kernel.h" /* configures the kernel */ + +/* sections */ + +#include +#include "../../kernel.h" +#include +#include +#include +#include +#include +#include "archconst.h" +#include "kernel/const.h" +#include "kernel/proc.h" +#include "sconst.h" +#include +#include +#include +#include "omap_intr.h" + +#include "arch_proto.h" /* K_STACK_SIZE */ + +IMPORT(svc_stack) + +/* + * Adjust lr, switch to SVC mode, and push pc/psr when exception triggered + * The 'lr_offset' argument holds the adjustment. It differs based on + * which mode the CPU is in. + */ +.macro switch_to_svc lr_offset + sub lr, lr, #\lr_offset + srsdb #MODE_SVC! + cps #MODE_SVC +.endm + +/* + * Test if the exception/interrupt occured in the kernel. + * Jump to 'label' argument if it occurred in the kernel. + * + * NOTE: switch_to_svc must be called first + */ +.macro test_int_in_kernel, label + push {r3} + ldr r3, [sp, #8] /* spsr */ + and r3, r3, #PSR_MODE_MASK + cmp r3, #MODE_USR + pop {r3} + bne \label /* In-kernel handling */ +.endm + +/* Save the register context to the proc structure */ +.macro save_process_ctx + push {lr} + ldr lr, [sp, #12] /* proc ptr */ + stm lr, {r0-r14}^ + ldr r12, [sp, #8] + str r12, [lr, #PSREG] + ldr r12, [sp, #4] + str r12, [lr, #PCREG] + pop {lr} + add sp, sp, #8 +.endm + +.macro exception_handler exc_name, exc_num, lr_offset +ENTRY(\exc_name\()_entry) + switch_to_svc \lr_offset + test_int_in_kernel \exc_name\()_entry_nested + +\exc_name\()entry_from_user: + save_process_ctx + + /* save the pointer to the current process */ + ldr fp, [sp] + /* save the exception pc (saved lr_user) */ + ldr r4, [fp, #PCREG] + + /* stop user process cycles */ + mov r0, fp /* first param: caller proc ptr */ + mov fp, #0 /* for stack trace */ + bl _C_LABEL(context_stop) + + /* + * push a pointer to the interrupt state pushed by the cpu and the + * vector number pushed by the vector handler just before calling + * exception_entry and call the exception handler. + */ + mov r0, #0 /* it's not a nested exception */ + mov r1, r4 /* saved lr */ + mov r2, #\exc_num /* vector number */ + bl _C_LABEL(exception_handler) + + b _C_LABEL(switch_to_user) + +\exc_name\()_entry_nested: + push {r0-r12, lr} + mov r0, #1 /* it's a nested exception */ + add r1, sp, #56 /* saved lr */ + mov r2, #\exc_num /* vector number */ + bl _C_LABEL(exception_handler) + pop {r0-r12, lr} + rfeia sp! +.endm + + +/* Exception handlers */ +exception_handler data_abort DATA_ABORT_VECTOR 8 +exception_handler prefetch_abort PREFETCH_ABORT_VECTOR 4 +exception_handler undefined_inst UNDEFINED_INST_VECTOR 4 + + +ENTRY(irq_entry) + switch_to_svc 4 + test_int_in_kernel irq_entry_from_kernel + +irq_entry_from_user: + save_process_ctx + + /* save the pointer to the current process */ + ldr fp, [sp] + + push {fp} /* save caller proc ptr */ + + /* stop user process cycles */ + mov r0, fp /* first param: caller proc ptr */ + mov fp, #0 /* for stack trace */ + bl _C_LABEL(context_stop) + + /* get irq num */ + ldr r3, =OMAP3_INTR_SIR_IRQ + ldr r0, [r3] + and r0, r0, #OMAP3_INTR_ACTIVEIRQ_MASK /* irq */ + /* call handler */ + bl _C_LABEL(irq_handle) /* irq_handle(irq) */ + + pop {fp} /* caller proc ptr */ + + /* allow new interrupts */ + mov r1, #OMAP3_INTR_NEWIRQAGR + ldr r3, =OMAP3_INTR_CONTROL + str r1, [r3] + + /* data synchronization barrier */ + dsb + + b _C_LABEL(switch_to_user) + +irq_entry_from_kernel: + push {r0-r12, lr} + bl _C_LABEL(context_stop_idle) + + /* get irq num */ + ldr r3, =OMAP3_INTR_SIR_IRQ + ldr r0, [r3] + and r0, r0, #OMAP3_INTR_ACTIVEIRQ_MASK /* irq */ + /* call handler */ + bl _C_LABEL(irq_handle) /* irq_handle(irq) */ + + /* allow new interrupts */ + mov r1, #OMAP3_INTR_NEWIRQAGR + ldr r3, =OMAP3_INTR_CONTROL + str r1, [r3] + + /* data synchronization barrier */ + dsb + + pop {r0-r12, lr} + rfeia sp! + + +/* + * supervisor call (SVC) kernel entry point + */ +ENTRY(svc_entry) + srsdb #MODE_SVC! + save_process_ctx + + /* save the pointer to the current process */ + ldr fp, [sp] + + cmp r3, #KERVEC + beq kernel_call_entry + cmp r3, #IPCVEC + beq ipc_entry + b invalid_svc + +/* + * kernel call is only from a process to kernel + */ +ENTRY(kernel_call_entry) + /* + * pass the syscall arguments from userspace to the handler. + * save_process_ctx() does not clobber these registers, they are still + * set as the userspace has set them + */ + push {fp} /* save caller proc ptr */ + push {r0} /* save msg ptr so it's not clobbered */ + + /* stop user process cycles */ + mov r0, fp /* first param: caller proc ptr */ + mov fp, #0 /* for stack trace */ + bl _C_LABEL(context_stop) + + pop {r0} /* first param: msg ptr */ + pop {r1} /* second param: caller proc ptr */ + bl _C_LABEL(kernel_call) + + b _C_LABEL(switch_to_user) + +/* + * IPC is only from a process to kernel + */ +ENTRY(ipc_entry) + /* + * pass the syscall arguments from userspace to the handler. + * save_process_ctx() does not clobber these registers, they are still + * set as the userspace have set them + */ + push {fp} /* save caller proc ptr */ + push {r0-r2} /* save regs so they're not clobbered */ + + /* stop user process cycles */ + mov r0, fp /* first param: caller proc ptr */ + mov fp, #0 /* for stack trace */ + bl _C_LABEL(context_stop) + + pop {r0-r2} /* restore regs */ + bl _C_LABEL(do_ipc) + + /* restore the current process pointer and save the return value */ + pop {fp} /* caller proc ptr */ + str r0, [fp, #REG0] + + b _C_LABEL(switch_to_user) + +ENTRY(invalid_svc) + b . + +ENTRY(restore_user_context) + /* sp holds the proc ptr */ + mov sp, r0 + + /* Set SPSR and LR for return */ + ldr r0, [sp, #PSREG] + msr spsr_fsxc, r0 + ldr lr, [sp, #PCREG] + + /* Restore user-mode registers from proc struct */ + ldm sp, {r0-r14}^ + + ldr sp, =_C_LABEL(svc_stack) + ldr sp, [sp] + + /* To user mode! */ + movs pc, lr + +/*===========================================================================*/ +/* data */ +/*===========================================================================*/ + +.data +.short 0x526F /* this must be the first data entry (magic #) */ +.bss +.data +.balign 4 +k_initial_stack: +.space K_STACK_SIZE +LABEL(__k_unpaged_k_initial_stktop) + +/* + * the kernel stack + */ +k_boot_stack: +.space K_STACK_SIZE /* kernel stack */ /* FIXME use macro here */ +LABEL(k_boot_stktop) /* top of kernel stack */ + +.balign K_STACK_SIZE +LABEL(k_stacks_start) + +/* two pages for each stack, one for data, other as a sandbox */ +.space 2 * (K_STACK_SIZE * CONFIG_MAX_CPUS) + +LABEL(k_stacks_end) + +/* top of kernel stack */ diff --git a/kernel/arch/arm/omap_intr.c b/kernel/arch/arm/omap_intr.c new file mode 100644 index 000000000..14c0b3283 --- /dev/null +++ b/kernel/arch/arm/omap_intr.c @@ -0,0 +1,19 @@ +#include +#include +#include +#include "omap_intr.h" + +int intr_init(const int auto_eoi) +{ + return 0; +} + +void omap3_irq_unmask(int irq) +{ + mmio_write(OMAP3_INTR_MIR_CLEAR(irq >> 5), 1 << (irq & 0x1f)); +} + +void omap3_irq_mask(const int irq) +{ + mmio_write(OMAP3_INTR_MIR_SET(irq >> 5), 1 << (irq & 0x1f)); +} diff --git a/kernel/arch/arm/omap_intr.h b/kernel/arch/arm/omap_intr.h new file mode 100644 index 000000000..98f6e5cea --- /dev/null +++ b/kernel/arch/arm/omap_intr.h @@ -0,0 +1,146 @@ +#ifndef _OMAP_INTR_H +#define _OMAP_INTR_H + +/* Interrupt controller memory map */ +#define OMAP3_INTR_BASE 0x48200000 /* INTCPS physical address */ + +/* Interrupt controller registers */ +#define OMAP3_INTCPS_REVISION 0x000 /* IP revision code */ +#define OMAP3_INTCPS_SYSCONFIG 0x010 /* Controls params */ +#define OMAP3_INTCPS_SYSSTATUS 0x014 /* Status */ +#define OMAP3_INTCPS_SIR_IRQ 0x040 /* Active IRQ number */ +#define OMAP3_INTCPS_SIR_FIQ 0x044 /* Active FIQ number */ +#define OMAP3_INTCPS_CONTROL 0x048 /* New int agreement bits */ +#define OMAP3_INTCPS_PROTECTION 0x04C /* Protection for other regs */ +#define OMAP3_INTCPS_IDLE 0x050 /* Clock auto-idle/gating */ +#define OMAP3_INTCPS_IRQ_PRIORITY 0x060 /* Active IRQ priority level */ +#define OMAP3_INTCPS_FIQ_PRIORITY 0x064 /* Active FIQ priority level */ +#define OMAP3_INTCPS_THRESHOLD 0x068 /* Priority threshold */ +#define OMAP3_INTCPS_ITR0 0x080 /* Raw pre-masking interrupt status */ +#define OMAP3_INTCPS_MIR0 0x084 /* Interrupt mask */ +#define OMAP3_INTCPS_MIR_CLEAR0 0x088 /* Clear interrupt mask bits */ +#define OMAP3_INTCPS_MIR_SET0 0x08C /* Set interrupt mask bits */ +#define OMAP3_INTCPS_ISR_SET0 0x090 /* Set software int bits */ +#define OMAP3_INTCPS_ISR_CLEAR0 0x094 /* Clear software int bits */ +#define OMAP3_INTCPS_PENDING_IRQ0 0x098 /* IRQ status post-masking */ +#define OMAP3_INTCPS_PENDING_FIQ0 0x09C /* FIQ status post-masking */ +#define OMAP3_INTCPS_ILR0 0x100 /* Priority for interrupts */ + + +#define OMAP3_INTR_REVISION (OMAP3_INTR_BASE + OMAP3_INTCPS_REVISION) +#define OMAP3_INTR_SYSCONFIG (OMAP3_INTR_BASE + OMAP3_INTCPS_SYSCONFIG) +#define OMAP3_INTR_SYSSTATUS (OMAP3_INTR_BASE + OMAP3_INTCPS_SYSSTATUS) +#define OMAP3_INTR_SIR_IRQ (OMAP3_INTR_BASE + OMAP3_INTCPS_SIR_IRQ) +#define OMAP3_INTR_SIR_FIQ (OMAP3_INTR_BASE + OMAP3_INTCPS_SIR_FIQ) +#define OMAP3_INTR_CONTROL (OMAP3_INTR_BASE + OMAP3_INTCPS_CONTROL) +#define OMAP3_INTR_PROTECTION (OMAP3_INTR_BASE + OMAP3_INTCPS_PROTECTION) +#define OMAP3_INTR_IDLE (OMAP3_INTR_BASE + OMAP3_INTCPS_IDLE) +#define OMAP3_INTR_IRQ_PRIORITY (OMAP3_INTR_BASE + OMAP3_INTCPS_IRQ_PRIORITY) +#define OMAP3_INTR_FIQ_PRIORITY (OMAP3_INTR_BASE + OMAP3_INTCPS_FIQ_PRIORITY) +#define OMAP3_INTR_THRESHOLD (OMAP3_INTR_BASE + OMAP3_INTCPS_THRESHOLD) + +#define OMAP3_INTR_ITR(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_ITR0 + 0x20 * (n)) +#define OMAP3_INTR_MIR(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_MIR0 + 0x20 * (n)) +#define OMAP3_INTR_MIR_CLEAR(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_MIR_CLEAR0 + 0x20 * (n)) +#define OMAP3_INTR_MIR_SET(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_MIR_SET0 + 0x20 * (n)) +#define OMAP3_INTR_ISR_SET(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_ISR_SET0 + 0x20 * (n)) +#define OMAP3_INTR_ISR_CLEAR(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_ISR_CLEAR0 + 0x20 * (n)) +#define OMAP3_INTR_PENDING_IRQ(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_PENDING_IRQ0 + 0x20 * (n)) +#define OMAP3_INTR_PENDING_FIQ(n) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_PENDING_FIQ0 + 0x20 * (n)) +#define OMAP3_INTR_ILR(m) \ + (OMAP3_INTR_BASE + OMAP3_INTCPS_ILR0 + 0x4 * (m)) + +#define OMAP3_INTR_ACTIVEIRQ_MASK 0x7f /* Active IRQ mask for SIR_IRQ */ +#define OMAP3_INTR_NEWIRQAGR 0x1 /* New IRQ Generation */ + +#define OMAP3_NR_IRQ_VECTORS 96 + +/* Interrupt mappings */ +#define OMAP3_MCBSP2_ST_IRQ 4 /* Sidestone McBSP2 overflow */ +#define OMAP3_MCBSP3_ST_IRQ 5 /* Sidestone McBSP3 overflow */ +#define OMAP3_SYS_NIRQ 7 /* External source (active low) */ +#define OMAP3_SMX_DBG_IRQ 9 /* L3 interconnect error for debug */ +#define OMAP3_SMX_APP_IRQ 10 /* L3 interconnect error for application */ +#define OMAP3_PRCM_IRQ 11 /* PRCM module */ +#define OMAP3_SDMA0_IRQ 12 /* System DMA request 0 */ +#define OMAP3_SDMA1_IRQ 13 /* System DMA request 1 */ +#define OMAP3_SDMA2_IRQ 14 /* System DMA request 2 */ +#define OMAP3_SDMA3_IRQ 15 /* System DMA request 3 */ +#define OMAP3_MCBSP1_IRQ 16 /* McBSP module 1 */ +#define OMAP3_MCBSP2_IRQ 17 /* McBSP module 2 */ +#define OMAP3_GPMC_IRQ 20 /* General-purpose memory controller */ +#define OMAP3_SGX_IRQ 21 /* 2D/3D graphics module */ +#define OMAP3_MCBSP3_IRQ 22 /* McBSP module 3 */ +#define OMAP3_MCBSP4_IRQ 23 /* McBSP module 4 */ +#define OMAP3_CAM0_IRQ 24 /* Camera interface request 0 */ +#define OMAP3_DSS_IRQ 25 /* Display subsystem module */ +#define OMAP3_MAIL_U0_IRQ 26 /* Mailbox user 0 request */ +#define OMAP3_MCBSP5_IRQ 27 /* McBSP module 5 */ +#define OMAP3_IVA2_MMU_IRQ 28 /* IVA2 MMU */ +#define OMAP3_GPIO1_IRQ 29 /* GPIO module 1 */ +#define OMAP3_GPIO2_IRQ 30 /* GPIO module 2 */ +#define OMAP3_GPIO3_IRQ 31 /* GPIO module 3 */ +#define OMAP3_GPIO4_IRQ 32 /* GPIO module 4 */ +#define OMAP3_GPIO5_IRQ 33 /* GPIO module 5 */ +#define OMAP3_GPIO6_IRQ 34 /* GPIO module 6 */ +#define OMAP3_WDT3_IRQ 36 /* Watchdog timer module 3 overflow */ +#define OMAP3_GPT1_IRQ 37 /* General-purpose timer module 1 */ +#define OMAP3_GPT2_IRQ 38 /* General-purpose timer module 2 */ +#define OMAP3_GPT3_IRQ 39 /* General-purpose timer module 3 */ +#define OMAP3_GPT4_IRQ 40 /* General-purpose timer module 4 */ +#define OMAP3_GPT5_IRQ 41 /* General-purpose timer module 5 */ +#define OMAP3_GPT6_IRQ 42 /* General-purpose timer module 6 */ +#define OMAP3_GPT7_IRQ 43 /* General-purpose timer module 7 */ +#define OMAP3_GPT8_IRQ 44 /* General-purpose timer module 8 */ +#define OMAP3_GPT9_IRQ 45 /* General-purpose timer module 9 */ +#define OMAP3_GPT10_IRQ 46 /* General-purpose timer module 10 */ +#define OMAP3_GPT11_IRQ 47 /* General-purpose timer module 11 */ +#define OMAP3_SPI4_IRQ 48 /* McSPI module 4 */ +#define OMAP3_MCBSP4_TX_IRQ 54 /* McBSP module 4 transmit */ +#define OMAP3_MCBSP4_RX_IRQ 55 /* McBSP module 4 receive */ +#define OMAP3_I2C1_IRQ 56 /* I2C module 1 */ +#define OMAP3_I2C2_IRQ 57 /* I2C module 2 */ +#define OMAP3_HDQ_IRQ 58 /* HDQ/1-Wire */ +#define OMAP3_MCBSP1_TX_IRQ 59 /* McBSP module 1 transmit */ +#define OMAP3_MCBSP1_RX_IRQ 60 /* McBSP module 1 receive */ +#define OMAP3_I2C3_IRQ 61 /* I2C module 3 */ +#define OMAP3_MCBSP2_TX_IRQ 62 /* McBSP module 2 transmit */ +#define OMAP3_MCBSP2_RX_IRQ 63 /* McBSP module 2 receive */ +#define OMAP3_SPI1_IRQ 65 /* McSPI module 1 */ +#define OMAP3_SPI2_IRQ 66 /* McSPI module 2 */ +#define OMAP3_UART1_IRQ 72 /* UART module 1 */ +#define OMAP3_UART2_IRQ 73 /* UART module 2 */ +#define OMAP3_PBIAS_IRQ 75 /* Merged interrupt for PBIASlite 1/2 */ +#define OMAP3_OHCI_IRQ 76 /* OHCI HSUSB MP Host Interrupt */ +#define OMAP3_EHCI_IRQ 77 /* EHCI HSUSB MP Host Interrupt */ +#define OMAP3_TLL_IRQ 78 /* HSUSB MP TLL Interrupt */ +#define OMAP3_MCBSP5_TX_IRQ 81 /* McBSP module 5 transmit */ +#define OMAP3_MCBSP5_RX_IRQ 82 /* McBSP module 5 receive */ +#define OMAP3_MMC1_IRQ 83 /* MMC/SD module 1 */ +#define OMAP3_MMC2_IRQ 86 /* MMC/SD module 2 */ +#define OMAP3_ICR_IRQ 87 /* MPU ICR */ +#define OMAP3_D2DFRINT_IRQ 88 /* 3G coproc (in stacked modem config) */ +#define OMAP3_MCBSP3_TX_IRQ 89 /* McBSP module 3 transmit */ +#define OMAP3_MCBSP3_RX_IRQ 90 /* McBSP module 3 receive */ +#define OMAP3_SPI3_IRQ 91 /* McSPI module 3 */ +#define OMAP3_HSUSB_MC_IRQ 92 /* High-speed USB OTG */ +#define OMAP3_HSUSB_DMA_IRQ 93 /* High-speed USB OTG DMA */ +#define OMAP3_MMC3_IRQ 94 /* MMC/SD module 3 */ + + +#ifndef __ASSEMBLY__ + +void omap3_irq_unmask(int irq); +void omap3_irq_mask(int irq); + +#endif /* __ASSEMBLY__ */ + +#endif /* _OMAP_INTR_H */ diff --git a/kernel/arch/arm/omap_serial.c b/kernel/arch/arm/omap_serial.c new file mode 100644 index 000000000..30e744e99 --- /dev/null +++ b/kernel/arch/arm/omap_serial.c @@ -0,0 +1,17 @@ +#include +#include +#include +#include "omap_serial.h" + +void omap3_ser_putc(char c) +{ + int i; + + /* Wait until FIFO's empty */ + for (i = 0; i < 100000; i++) + if (mmio_read(OMAP3_UART3_LSR) & OMAP3_LSR_TX_FIFO_E) + break; + + /* Write character */ + mmio_write(OMAP3_UART3_THR, c); +} diff --git a/kernel/arch/arm/omap_serial.h b/kernel/arch/arm/omap_serial.h new file mode 100644 index 000000000..278d02883 --- /dev/null +++ b/kernel/arch/arm/omap_serial.h @@ -0,0 +1,30 @@ +#ifndef _OMAP_SERIAL_H +#define _OMAP_SERIAL_H + +/* UART register map */ +#define OMAP3_UART1_BASE 0x4806A000 /* UART1 physical address */ +#define OMAP3_UART2_BASE 0x4806C000 /* UART2 physical address */ +#define OMAP3_UART3_BASE 0x49020000 /* UART3 physical address */ + +/* UART registers */ +#define OMAP3_THR 0x000 /* Transmit holding register */ +#define OMAP3_LSR 0x014 /* Line status register */ +#define OMAP3_SSR 0x044 /* Supplementary status register */ + +/* Line status register fields */ +#define OMAP3_LSR_TX_FIFO_E (1 << 5) /* Transmit FIFO empty */ + +/* Supplementary status register fields */ +#define OMAP3_SSR_TX_FIFO_FULL (1 << 0) /* Transmit FIFO full */ + +#define OMAP3_UART3_THR (OMAP3_UART3_BASE + OMAP3_THR) +#define OMAP3_UART3_LSR (OMAP3_UART3_BASE + OMAP3_LSR) +#define OMAP3_UART3_SSR (OMAP3_UART3_BASE + OMAP3_SSR) + +#ifndef __ASSEMBLY__ + +void omap3_ser_putc(char c); + +#endif /* __ASSEMBLY__ */ + +#endif /* _OMAP_SERIAL_H */ diff --git a/kernel/arch/arm/omap_timer.c b/kernel/arch/arm/omap_timer.c new file mode 100644 index 000000000..20ac46110 --- /dev/null +++ b/kernel/arch/arm/omap_timer.c @@ -0,0 +1,66 @@ +#include "kernel/kernel.h" +#include "kernel/clock.h" +#include +#include +#include +#include "arch_proto.h" +#include "omap_timer.h" +#include "omap_intr.h" + +static irq_hook_t omap3_timer_hook; /* interrupt handler hook */ + +int omap3_register_timer_handler(const irq_handler_t handler) +{ + /* Initialize the CLOCK's interrupt hook. */ + omap3_timer_hook.proc_nr_e = NONE; + omap3_timer_hook.irq = OMAP3_GPT1_IRQ; + + put_irq_handler(&omap3_timer_hook, OMAP3_GPT1_IRQ, handler); + + return 0; +} + +void omap3_timer_init(unsigned freq) +{ + /* Stop timer */ + mmio_clear(OMAP3_GPTIMER1_TCLR, OMAP3_TCLR_ST); + + /* Use 32 KHz clock source for GPTIMER1 */ + mmio_clear(OMAP3_CM_CLKSEL_WKUP, OMAP3_CLKSEL_GPT1); + + /* Use 1-ms tick mode for GPTIMER1 */ + mmio_write(OMAP3_GPTIMER1_TPIR, 232000); + mmio_write(OMAP3_GPTIMER1_TNIR, -768000); + mmio_write(OMAP3_GPTIMER1_TLDR, 0xffffffe0); + mmio_write(OMAP3_GPTIMER1_TCRR, 0xffffffe0); + + /* Set frequency */ + mmio_write(OMAP3_GPTIMER1_TOWR, TIMER_COUNT(freq)); + + /* Set up overflow interrupt */ + mmio_write(OMAP3_GPTIMER1_TISR, ~0); + mmio_write(OMAP3_GPTIMER1_TIER, OMAP3_TIER_OVF_IT_ENA); + omap3_irq_unmask(OMAP3_GPT1_IRQ); + + /* Start timer */ + mmio_set(OMAP3_GPTIMER1_TCLR, + OMAP3_TCLR_OVF_TRG|OMAP3_TCLR_AR|OMAP3_TCLR_ST); +} + +void omap3_timer_stop() +{ + mmio_clear(OMAP3_GPTIMER1_TCLR, OMAP3_TCLR_ST); +} + +static u64_t tsc; +void omap3_timer_int_handler() +{ + /* Clear the interrupt */ + mmio_write(OMAP3_GPTIMER1_TISR, ~0); + tsc++; +} + +void read_tsc_64(u64_t *t) +{ + *t = tsc; +} diff --git a/kernel/arch/arm/omap_timer.h b/kernel/arch/arm/omap_timer.h new file mode 100644 index 000000000..5317b0e28 --- /dev/null +++ b/kernel/arch/arm/omap_timer.h @@ -0,0 +1,95 @@ +#ifndef _OMAP_TIMER_H +#define _OMAP_TIMER_H + +/* General-purpose timer register map */ +#define OMAP3_GPTIMER1_BASE 0x48318000 /* GPTIMER1 physical address */ +#define OMAP3_GPTIMER2_BASE 0x49032000 /* GPTIMER2 physical address */ +#define OMAP3_GPTIMER3_BASE 0x49034000 /* GPTIMER3 physical address */ +#define OMAP3_GPTIMER4_BASE 0x49036000 /* GPTIMER4 physical address */ +#define OMAP3_GPTIMER5_BASE 0x49038000 /* GPTIMER5 physical address */ +#define OMAP3_GPTIMER6_BASE 0x4903A000 /* GPTIMER6 physical address */ +#define OMAP3_GPTIMER7_BASE 0x4903C000 /* GPTIMER7 physical address */ +#define OMAP3_GPTIMER8_BASE 0x4903E000 /* GPTIMER8 physical address */ +#define OMAP3_GPTIMER9_BASE 0x49040000 /* GPTIMER9 physical address */ +#define OMAP3_GPTIMER10_BASE 0x48086000 /* GPTIMER10 physical address */ +#define OMAP3_GPTIMER11_BASE 0x48088000 /* GPTIMER11 physical address */ + +/* General-purpose timer registers */ +#define OMAP3_TIDR 0x000 /* IP revision code */ +#define OMAP3_TIOCP_CFG 0x010 /* Controls params for GP timer L4 interface */ +#define OMAP3_TISTAT 0x014 /* Status (excl. interrupt status) */ +#define OMAP3_TISR 0x018 /* Pending interrupt status */ +#define OMAP3_TIER 0x01C /* Interrupt enable */ +#define OMAP3_TWER 0x020 /* Wakeup enable */ +#define OMAP3_TCLR 0x024 /* Controls optional features */ +#define OMAP3_TCRR 0x028 /* Internal counter value */ +#define OMAP3_TLDR 0x02C /* Timer load value */ +#define OMAP3_TTGR 0x030 /* Triggers counter reload */ +#define OMAP3_TWPS 0x034 /* Indicates if Write-Posted pending */ +#define OMAP3_TMAR 0x038 /* Value to be compared with counter */ +#define OMAP3_TCAR1 0x03C /* First captured value of counter register */ +#define OMAP3_TSICR 0x040 /* Control posted mode and functional SW reset */ +#define OMAP3_TCAR2 0x044 /* Second captured value of counter register */ +#define OMAP3_TPIR 0x048 /* Positive increment (1 ms tick) */ +#define OMAP3_TNIR 0x04C /* Negative increment (1 ms tick) */ +#define OMAP3_TCVR 0x050 /* Defines TCRR is sub/over-period (1 ms tick) */ +#define OMAP3_TOCR 0x054 /* Masks tick interrupt */ +#define OMAP3_TOWR 0x058 /* Number of masked overflow interrupts */ + +/* Interrupt status register fields */ +#define OMAP3_TISR_MAT_IT_FLAG (1 << 0) /* Pending match interrupt status */ +#define OMAP3_TISR_OVF_IT_FLAG (1 << 1) /* Pending overflow interrupt status */ +#define OMAP3_TISR_TCAR_IT_FLAG (1 << 2) /* Pending capture interrupt status */ + +/* Interrupt enable register fields */ +#define OMAP3_TIER_MAT_IT_ENA (1 << 0) /* Enable match interrupt */ +#define OMAP3_TIER_OVF_IT_ENA (1 << 1) /* Enable overflow interrupt */ +#define OMAP3_TIER_TCAR_IT_ENA (1 << 2) /* Enable capture interrupt */ + +/* Timer control fields */ +#define OMAP3_TCLR_ST (1 << 0) /* Start/stop timer */ +#define OMAP3_TCLR_AR (1 << 1) /* Autoreload or one-shot mode */ +#define OMAP3_TCLR_OVF_TRG (1 << 10) /* Overflow trigger */ + +#define OMAP3_GPTIMER1_TIDR (OMAP3_GPTIMER1_BASE + OMAP3_TIDR) +#define OMAP3_GPTIMER1_TIOCP_CFG (OMAP3_GPTIMER1_BASE + OMAP3_TIOCP_CFG) +#define OMAP3_GPTIMER1_TISTAT (OMAP3_GPTIMER1_BASE + OMAP3_TISTAT) +#define OMAP3_GPTIMER1_TISR (OMAP3_GPTIMER1_BASE + OMAP3_TISR) +#define OMAP3_GPTIMER1_TIER (OMAP3_GPTIMER1_BASE + OMAP3_TIER) +#define OMAP3_GPTIMER1_TWER (OMAP3_GPTIMER1_BASE + OMAP3_TWER) +#define OMAP3_GPTIMER1_TCLR (OMAP3_GPTIMER1_BASE + OMAP3_TCLR) +#define OMAP3_GPTIMER1_TCRR (OMAP3_GPTIMER1_BASE + OMAP3_TCRR) +#define OMAP3_GPTIMER1_TLDR (OMAP3_GPTIMER1_BASE + OMAP3_TLDR) +#define OMAP3_GPTIMER1_TTGR (OMAP3_GPTIMER1_BASE + OMAP3_TTGR) +#define OMAP3_GPTIMER1_TWPS (OMAP3_GPTIMER1_BASE + OMAP3_TWPS) +#define OMAP3_GPTIMER1_TMAR (OMAP3_GPTIMER1_BASE + OMAP3_TMAR) +#define OMAP3_GPTIMER1_TCAR1 (OMAP3_GPTIMER1_BASE + OMAP3_TCAR1) +#define OMAP3_GPTIMER1_TSICR (OMAP3_GPTIMER1_BASE + OMAP3_TSICR) +#define OMAP3_GPTIMER1_TCAR2 (OMAP3_GPTIMER1_BASE + OMAP3_TCAR2) +#define OMAP3_GPTIMER1_TPIR (OMAP3_GPTIMER1_BASE + OMAP3_TPIR) +#define OMAP3_GPTIMER1_TNIR (OMAP3_GPTIMER1_BASE + OMAP3_TNIR) +#define OMAP3_GPTIMER1_TCVR (OMAP3_GPTIMER1_BASE + OMAP3_TCVR) +#define OMAP3_GPTIMER1_TOCR (OMAP3_GPTIMER1_BASE + OMAP3_TOCR) +#define OMAP3_GPTIMER1_TOWR (OMAP3_GPTIMER1_BASE + OMAP3_TOWR) + +#define OMAP3_CM_CLKSEL_WKUP 0x48004c40 /* source clock selection */ +#define OMAP3_CLKSEL_GPT1 (1 << 0) /* Selects GPTIMER 1 source + * clock: + * + * 0: use 32KHz clock + * 1: sys clock) + */ + +#define TIMER_FREQ 1000 /* clock frequency for OMAP timer (1ms) */ +#define TIMER_COUNT(freq) (TIMER_FREQ/(freq)) /* initial value for counter*/ + +#ifndef __ASSEMBLY__ + +void omap3_timer_init(unsigned freq); +void omap3_timer_stop(void); +int omap3_register_timer_handler(const irq_handler_t handler); +void omap3_timer_int_handler(void); + +#endif /* __ASSEMBLY__ */ + +#endif /* _OMAP_TIMER_H */ diff --git a/kernel/arch/arm/pg_utils.c b/kernel/arch/arm/pg_utils.c new file mode 100644 index 000000000..15877d4c8 --- /dev/null +++ b/kernel/arch/arm/pg_utils.c @@ -0,0 +1,292 @@ + +#include + +#include +#include +#include +#include "kernel.h" +#include "arch_proto.h" +#include + +#include +#include +#include + +/* These are set/computed in kernel.lds. */ +extern char _kern_vir_base, _kern_phys_base, _kern_size; + +/* Retrieve the absolute values to something we can use. */ +static phys_bytes kern_vir_start = (phys_bytes) &_kern_vir_base; +static phys_bytes kern_phys_start = (phys_bytes) &_kern_phys_base; +static phys_bytes kern_kernlen = (phys_bytes) &_kern_size; + +/* page directory we can use to map things */ +static u32_t pagedir[4096] __aligned(16384); + +void print_memmap(kinfo_t *cbi) +{ + int m; + assert(cbi->mmap_size < MAXMEMMAP); + for(m = 0; m < cbi->mmap_size; m++) { + phys_bytes addr = cbi->memmap[m].addr, endit = cbi->memmap[m].addr + cbi->memmap[m].len; + printf("%08lx-%08lx ",addr, endit); + } + printf("\nsize %08lx\n", cbi->mmap_size); +} + +void cut_memmap(kinfo_t *cbi, phys_bytes start, phys_bytes end) +{ + int m; + phys_bytes o; + + if((o=start % ARM_PAGE_SIZE)) + start -= o; + if((o=end % ARM_PAGE_SIZE)) + end += ARM_PAGE_SIZE - o; + + assert(kernel_may_alloc); + + for(m = 0; m < cbi->mmap_size; m++) { + phys_bytes substart = start, subend = end; + phys_bytes memaddr = cbi->memmap[m].addr, + memend = cbi->memmap[m].addr + cbi->memmap[m].len; + + /* adjust cut range to be a subset of the free memory */ + if(substart < memaddr) substart = memaddr; + if(subend > memend) subend = memend; + if(substart >= subend) continue; + + /* if there is any overlap, forget this one and add + * 1-2 subranges back + */ + cbi->memmap[m].addr = cbi->memmap[m].len = 0; + if(substart > memaddr) + add_memmap(cbi, memaddr, substart-memaddr); + if(subend < memend) + add_memmap(cbi, subend, memend-subend); + } +} + +phys_bytes alloc_lowest(kinfo_t *cbi, phys_bytes len) +{ + /* Allocate the lowest physical page we have. */ + int m; +#define EMPTY 0xffffffff + phys_bytes lowest = EMPTY; + assert(len > 0); + len = roundup(len, ARM_PAGE_SIZE); + + assert(kernel_may_alloc); + + for(m = 0; m < cbi->mmap_size; m++) { + if(cbi->memmap[m].len < len) continue; + if(cbi->memmap[m].addr < lowest) lowest = cbi->memmap[m].addr; + } + assert(lowest != EMPTY); + cut_memmap(cbi, lowest, len); + return lowest; +} + +void add_memmap(kinfo_t *cbi, u64_t addr, u64_t len) +{ + int m; +#define LIMIT 0xFFFFF000 + /* Truncate available memory at 4GB as the rest of minix + * currently can't deal with any bigger. + */ + if(addr > LIMIT) return; + if(addr + len > LIMIT) { + len -= (addr + len - LIMIT); + } + assert(cbi->mmap_size < MAXMEMMAP); + if(len == 0) return; + addr = roundup(addr, ARM_PAGE_SIZE); + len = rounddown(len, ARM_PAGE_SIZE); + + assert(kernel_may_alloc); + + for(m = 0; m < MAXMEMMAP; m++) { + phys_bytes highmark; + if(cbi->memmap[m].len) continue; + cbi->memmap[m].addr = addr; + cbi->memmap[m].len = len; + cbi->memmap[m].type = MULTIBOOT_MEMORY_AVAILABLE; + if(m >= cbi->mmap_size) + cbi->mmap_size = m+1; + highmark = addr + len; + if(highmark > cbi->mem_high_phys) { + cbi->mem_high_phys = highmark; + } + + return; + } + + panic("no available memmap slot"); +} + +u32_t *alloc_pagetable(phys_bytes *ph) +{ + u32_t *ret; +#define PG_PAGETABLES 24 + static u32_t pagetables[PG_PAGETABLES][256] __aligned(1024); + static int pt_inuse = 0; + if(pt_inuse >= PG_PAGETABLES) panic("no more pagetables"); + assert(sizeof(pagetables[pt_inuse]) == 1024); + ret = pagetables[pt_inuse++]; + *ph = vir2phys(ret); + return ret; +} + +#define PAGE_KB (ARM_PAGE_SIZE / 1024) + +phys_bytes pg_alloc_page(kinfo_t *cbi) +{ + int m; + multiboot_memory_map_t *mmap; + + assert(kernel_may_alloc); + + for(m = 0; m < cbi->mmap_size; m++) { + mmap = &cbi->memmap[m]; + if(!mmap->len) continue; + assert(mmap->len > 0); + assert(!(mmap->len % ARM_PAGE_SIZE)); + assert(!(mmap->addr % ARM_PAGE_SIZE)); + + u32_t addr = mmap->addr; + mmap->addr += ARM_PAGE_SIZE; + mmap->len -= ARM_PAGE_SIZE; + + return addr; + } + + panic("can't find free memory"); +} + +void pg_identity(kinfo_t *cbi) +{ + int i; + phys_bytes phys; + + /* We map memory that does not correspond to physical memory + * as non-cacheable. Make sure we know what it is. + */ + assert(cbi->mem_high_phys); + + /* Set up an identity mapping page directory */ + for(i = 0; i < ARM_VM_DIR_ENTRIES; i++) { + u32_t flags = ARM_VM_SECTION | + ARM_VM_SECTION_DOMAIN | ARM_VM_SECTION_USER; + phys = i * ARM_BIG_PAGE_SIZE; + pagedir[i] = phys | flags; + } +} + +int pg_mapkernel(void) +{ + int pde; + u32_t mapped = 0, kern_phys = kern_phys_start; + + assert(!(kern_vir_start % ARM_BIG_PAGE_SIZE)); + assert(!(kern_phys_start % ARM_BIG_PAGE_SIZE)); + pde = kern_vir_start / ARM_BIG_PAGE_SIZE; /* start pde */ + while(mapped < kern_kernlen) { + pagedir[pde] = (kern_phys & ARM_VM_PDE_MASK) | + ARM_VM_SECTION | + ARM_VM_SECTION_DOMAIN | ARM_VM_SECTION_WB | + ARM_VM_SECTION_SHAREABLE | ARM_VM_SECTION_SUPER; + mapped += ARM_BIG_PAGE_SIZE; + kern_phys += ARM_BIG_PAGE_SIZE; + pde++; + } + return pde; /* free pde */ +} + +void vm_enable_paging(void) +{ + u32_t sctlr; + + write_ttbcr(0); + + /* Set all Domains to Client */ + write_dacr(0x55555555); + + /* Enable MMU and access flag */ + sctlr = read_sctlr(); + sctlr |= (SCTLR_M); + write_sctlr(sctlr); +} + +phys_bytes pg_load() +{ + phys_bytes phpagedir = vir2phys(pagedir); + refresh_tlb(); + write_ttbr0(phpagedir); + return phpagedir; +} + +void pg_clear(void) +{ + memset(pagedir, 0, sizeof(pagedir)); +} + +phys_bytes pg_rounddown(phys_bytes b) +{ + phys_bytes o; + if(!(o = b % ARM_PAGE_SIZE)) + return b; + return b - o; +} + +void pg_map(phys_bytes phys, vir_bytes vaddr, vir_bytes vaddr_end, + kinfo_t *cbi) +{ + static int mapped_pde = -1; + static u32_t *pt = NULL; + int pde, pte; + + assert(kernel_may_alloc); + + if(phys == PG_ALLOCATEME) { + assert(!(vaddr % ARM_PAGE_SIZE)); + } else { + assert((vaddr % ARM_PAGE_SIZE) == (phys % ARM_PAGE_SIZE)); + vaddr = pg_rounddown(vaddr); + phys = pg_rounddown(phys); + } + assert(vaddr < kern_vir_start); + + while(vaddr < vaddr_end) { + phys_bytes source = phys; + assert(!(vaddr % ARM_PAGE_SIZE)); + if(phys == PG_ALLOCATEME) { + source = pg_alloc_page(cbi); + } else { + assert(!(phys % ARM_PAGE_SIZE)); + } + assert(!(source % ARM_PAGE_SIZE)); + pde = ARM_VM_PDE(vaddr); + pte = ARM_VM_PTE(vaddr); + if(mapped_pde < pde) { + phys_bytes ph; + pt = alloc_pagetable(&ph); + pagedir[pde] = (ph & ARM_VM_PDE_MASK) + | ARM_VM_PAGEDIR | ARM_VM_PDE_DOMAIN; + mapped_pde = pde; + } + assert(pt); + pt[pte] = (source & ARM_VM_PTE_MASK) + | ARM_VM_PAGETABLE + | ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE + | ARM_VM_PTE_USER; + vaddr += ARM_PAGE_SIZE; + if(phys != PG_ALLOCATEME) + phys += ARM_PAGE_SIZE; + } +} + +void pg_info(reg_t *pagedir_ph, u32_t **pagedir_v) +{ + *pagedir_ph = vir2phys(pagedir); + *pagedir_v = pagedir; +} diff --git a/kernel/arch/arm/phys_copy.S b/kernel/arch/arm/phys_copy.S new file mode 100644 index 000000000..e548f7eb0 --- /dev/null +++ b/kernel/arch/arm/phys_copy.S @@ -0,0 +1,389 @@ +/* $NetBSD: memcpy_arm.S,v 1.2 2008/04/28 20:22:52 martin Exp $ */ + +/*- + * Copyright (c) 1997 The NetBSD Foundation, Inc. + * All rights reserved. + * + * This code is derived from software contributed to The NetBSD Foundation + * by Neil A. Carson and Mark Brinicombe + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include + +/* + * This is one fun bit of code ... + * Some easy listening music is suggested while trying to understand this + * code e.g. Iron Maiden + * + * For anyone attempting to understand it : + * + * The core code is implemented here with simple stubs for memcpy(). + * + * All local labels are prefixed with Lmemcpy_ + * Following the prefix a label starting f is used in the forward copy code + * while a label using b is used in the backwards copy code + * The source and destination addresses determine whether a forward or + * backward copy is performed. + * Separate bits of code are used to deal with the following situations + * for both the forward and backwards copy. + * unaligned source address + * unaligned destination address + * Separate copy routines are used to produce an optimised result for each + * of these cases. + * The copy code will use LDM/STM instructions to copy up to 32 bytes at + * a time where possible. + * + * Note: r12 (aka ip) can be trashed during the function along with + * r0-r3 although r0-r2 have defined uses i.e. src, dest, len through out. + * Additional registers are preserved prior to use i.e. r4, r5 & lr + * + * Apologies for the state of the comments ;-) + */ + +/* For MINIX, we always spill r0, r4, r5, and lr, so we can easily + * clean up the stack after a phys_copy fault. NetBSD, in contrast, + * spills the minimum number of registers for each path. + */ +#if defined(__minix) +/* LINTSTUB: Func: void *phys_copy(void *src, void *dst, size_t len) */ +ENTRY(phys_copy) + /* switch the source and destination registers */ + eor r0, r1, r0 + eor r1, r0, r1 + eor r0, r1, r0 +#else +/* LINTSTUB: Func: void *memcpy(void *dst, const void *src, size_t len) */ +ENTRY(memcpy) +#endif + /* save leaf functions having to store this away */ +#if defined(__minix) + stmdb sp!, {r0, r4, r5, lr} /* memcpy() returns dest addr */ +#else + stmdb sp!, {r0, lr} /* memcpy() returns dest addr */ +#endif + + subs r2, r2, #4 + blt .Lmemcpy_l4 /* less than 4 bytes */ + ands r12, r0, #3 + bne .Lmemcpy_destul /* oh unaligned destination addr */ + ands r12, r1, #3 + bne .Lmemcpy_srcul /* oh unaligned source addr */ + +.Lmemcpy_t8: + /* We have aligned source and destination */ + subs r2, r2, #8 + blt .Lmemcpy_l12 /* less than 12 bytes (4 from above) */ + subs r2, r2, #0x14 + blt .Lmemcpy_l32 /* less than 32 bytes (12 from above) */ +#if !defined(__minix) + stmdb sp!, {r4} /* borrow r4 */ +#endif + + /* blat 32 bytes at a time */ + /* XXX for really big copies perhaps we should use more registers */ +.Lmemcpy_loop32: + ldmia r1!, {r3, r4, r12, lr} + stmia r0!, {r3, r4, r12, lr} + ldmia r1!, {r3, r4, r12, lr} + stmia r0!, {r3, r4, r12, lr} + subs r2, r2, #0x20 + bge .Lmemcpy_loop32 + + cmn r2, #0x10 + ldmgeia r1!, {r3, r4, r12, lr} /* blat a remaining 16 bytes */ + stmgeia r0!, {r3, r4, r12, lr} + subge r2, r2, #0x10 +#if !defined(__minix) + ldmia sp!, {r4} /* return r4 */ +#endif + +.Lmemcpy_l32: + adds r2, r2, #0x14 + + /* blat 12 bytes at a time */ +.Lmemcpy_loop12: + ldmgeia r1!, {r3, r12, lr} + stmgeia r0!, {r3, r12, lr} + subges r2, r2, #0x0c + bge .Lmemcpy_loop12 + +.Lmemcpy_l12: + adds r2, r2, #8 + blt .Lmemcpy_l4 + + subs r2, r2, #4 + ldrlt r3, [r1], #4 + strlt r3, [r0], #4 + ldmgeia r1!, {r3, r12} + stmgeia r0!, {r3, r12} + subge r2, r2, #4 + +.Lmemcpy_l4: + /* less than 4 bytes to go */ + adds r2, r2, #4 +#if defined(__minix) + ldmeqia sp!, {r0, r4, r5} + moveq r0, #0 + ldmeqia sp!, {pc} +#else +#ifdef __APCS_26_ + ldmeqia sp!, {r0, pc}^ /* done */ +#else + ldmeqia sp!, {r0, pc} /* done */ +#endif +#endif + /* copy the crud byte at a time */ + cmp r2, #2 + ldrb r3, [r1], #1 + strb r3, [r0], #1 + ldrgeb r3, [r1], #1 + strgeb r3, [r0], #1 + ldrgtb r3, [r1], #1 + strgtb r3, [r0], #1 +#if defined(__minix) + ldmia sp!, {r0, r4, r5} + mov r0, #0 + ldmia sp!, {pc} +#else + ldmia sp!, {r0, pc} +#endif + + /* erg - unaligned destination */ +.Lmemcpy_destul: + rsb r12, r12, #4 + cmp r12, #2 + + /* align destination with byte copies */ + ldrb r3, [r1], #1 + strb r3, [r0], #1 + ldrgeb r3, [r1], #1 + strgeb r3, [r0], #1 + ldrgtb r3, [r1], #1 + strgtb r3, [r0], #1 + subs r2, r2, r12 + blt .Lmemcpy_l4 /* less the 4 bytes */ + + ands r12, r1, #3 + beq .Lmemcpy_t8 /* we have an aligned source */ + + /* erg - unaligned source */ + /* This is where it gets nasty ... */ +.Lmemcpy_srcul: + bic r1, r1, #3 + ldr lr, [r1], #4 + cmp r12, #2 + bgt .Lmemcpy_srcul3 + beq .Lmemcpy_srcul2 + cmp r2, #0x0c + blt .Lmemcpy_srcul1loop4 + sub r2, r2, #0x0c +#if !defined(__minix) + stmdb sp!, {r4, r5} +#endif + +.Lmemcpy_srcul1loop16: +#ifdef __ARMEB__ + mov r3, lr, lsl #8 +#else + mov r3, lr, lsr #8 +#endif + ldmia r1!, {r4, r5, r12, lr} +#ifdef __ARMEB__ + orr r3, r3, r4, lsr #24 + mov r4, r4, lsl #8 + orr r4, r4, r5, lsr #24 + mov r5, r5, lsl #8 + orr r5, r5, r12, lsr #24 + mov r12, r12, lsl #8 + orr r12, r12, lr, lsr #24 +#else + orr r3, r3, r4, lsl #24 + mov r4, r4, lsr #8 + orr r4, r4, r5, lsl #24 + mov r5, r5, lsr #8 + orr r5, r5, r12, lsl #24 + mov r12, r12, lsr #8 + orr r12, r12, lr, lsl #24 +#endif + stmia r0!, {r3-r5, r12} + subs r2, r2, #0x10 + bge .Lmemcpy_srcul1loop16 +#if !defined(__minix) + ldmia sp!, {r4, r5} +#endif + adds r2, r2, #0x0c + blt .Lmemcpy_srcul1l4 + +.Lmemcpy_srcul1loop4: +#ifdef __ARMEB__ + mov r12, lr, lsl #8 +#else + mov r12, lr, lsr #8 +#endif + ldr lr, [r1], #4 +#ifdef __ARMEB__ + orr r12, r12, lr, lsr #24 +#else + orr r12, r12, lr, lsl #24 +#endif + str r12, [r0], #4 + subs r2, r2, #4 + bge .Lmemcpy_srcul1loop4 + +.Lmemcpy_srcul1l4: + sub r1, r1, #3 + b .Lmemcpy_l4 + +.Lmemcpy_srcul2: + cmp r2, #0x0c + blt .Lmemcpy_srcul2loop4 + sub r2, r2, #0x0c +#if !defined(__minix) + stmdb sp!, {r4, r5} +#endif + +.Lmemcpy_srcul2loop16: +#ifdef __ARMEB__ + mov r3, lr, lsl #16 +#else + mov r3, lr, lsr #16 +#endif + ldmia r1!, {r4, r5, r12, lr} +#ifdef __ARMEB__ + orr r3, r3, r4, lsr #16 + mov r4, r4, lsl #16 + orr r4, r4, r5, lsr #16 + mov r5, r5, lsl #16 + orr r5, r5, r12, lsr #16 + mov r12, r12, lsl #16 + orr r12, r12, lr, lsr #16 +#else + orr r3, r3, r4, lsl #16 + mov r4, r4, lsr #16 + orr r4, r4, r5, lsl #16 + mov r5, r5, lsr #16 + orr r5, r5, r12, lsl #16 + mov r12, r12, lsr #16 + orr r12, r12, lr, lsl #16 +#endif + stmia r0!, {r3-r5, r12} + subs r2, r2, #0x10 + bge .Lmemcpy_srcul2loop16 +#if !defined(__minix) + ldmia sp!, {r4, r5} +#endif + adds r2, r2, #0x0c + blt .Lmemcpy_srcul2l4 + +.Lmemcpy_srcul2loop4: +#ifdef __ARMEB__ + mov r12, lr, lsl #16 +#else + mov r12, lr, lsr #16 +#endif + ldr lr, [r1], #4 +#ifdef __ARMEB__ + orr r12, r12, lr, lsr #16 +#else + orr r12, r12, lr, lsl #16 +#endif + str r12, [r0], #4 + subs r2, r2, #4 + bge .Lmemcpy_srcul2loop4 + +.Lmemcpy_srcul2l4: + sub r1, r1, #2 + b .Lmemcpy_l4 + +.Lmemcpy_srcul3: + cmp r2, #0x0c + blt .Lmemcpy_srcul3loop4 + sub r2, r2, #0x0c +#if !defined(__minix) + stmdb sp!, {r4, r5} +#endif + +.Lmemcpy_srcul3loop16: +#ifdef __ARMEB__ + mov r3, lr, lsl #24 +#else + mov r3, lr, lsr #24 +#endif + ldmia r1!, {r4, r5, r12, lr} +#ifdef __ARMEB__ + orr r3, r3, r4, lsr #8 + mov r4, r4, lsl #24 + orr r4, r4, r5, lsr #8 + mov r5, r5, lsl #24 + orr r5, r5, r12, lsr #8 + mov r12, r12, lsl #24 + orr r12, r12, lr, lsr #8 +#else + orr r3, r3, r4, lsl #8 + mov r4, r4, lsr #24 + orr r4, r4, r5, lsl #8 + mov r5, r5, lsr #24 + orr r5, r5, r12, lsl #8 + mov r12, r12, lsr #24 + orr r12, r12, lr, lsl #8 +#endif + stmia r0!, {r3-r5, r12} + subs r2, r2, #0x10 + bge .Lmemcpy_srcul3loop16 +#if !defined(__minix) + ldmia sp!, {r4, r5} +#endif + adds r2, r2, #0x0c + blt .Lmemcpy_srcul3l4 + +.Lmemcpy_srcul3loop4: +#ifdef __ARMEB__ + mov r12, lr, lsl #24 +#else + mov r12, lr, lsr #24 +#endif + ldr lr, [r1], #4 +#ifdef __ARMEB__ + orr r12, r12, lr, lsr #8 +#else + orr r12, r12, lr, lsl #8 +#endif + str r12, [r0], #4 + subs r2, r2, #4 + bge .Lmemcpy_srcul3loop4 + +.Lmemcpy_srcul3l4: + sub r1, r1, #1 + b .Lmemcpy_l4 + +#if defined(__minix) +LABEL(phys_copy_fault) /* kernel can send us here */ + ldmia sp!, {r0, r4, r5} + ldmia sp!, {pc} + +LABEL(phys_copy_fault_in_kernel) /* kernel can send us here */ + ldmia sp!, {r0, r4, r5} + mrc p15, 0, r0, c6, c0, 0 /* Read DFAR */ + ldmia sp!, {pc} +#endif diff --git a/kernel/arch/arm/phys_memset.S b/kernel/arch/arm/phys_memset.S new file mode 100644 index 000000000..c3200230e --- /dev/null +++ b/kernel/arch/arm/phys_memset.S @@ -0,0 +1,274 @@ +/* $NetBSD: memset.S,v 1.1 2005/12/20 19:28:49 christos Exp $ */ + +/* + * Copyright 2003 Wasabi Systems, Inc. + * All rights reserved. + * + * Written by Steve C. Woodford for Wasabi Systems, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed for the NetBSD Project by + * Wasabi Systems, Inc. + * 4. The name of Wasabi Systems, Inc. may not be used to endorse + * or promote products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ +/* + * Copyright (c) 1995 Mark Brinicombe. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Mark Brinicombe. + * 4. The name of the company nor the name of the author may be used to + * endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include + +/* + * memset: Sets a block of memory to the specified value + * + * On entry: + * r0 - dest address + * r1 - byte to write + * r2 - number of bytes to write + * + * On exit: + * r0 - dest address + */ +#ifdef _BZERO +/* LINTSTUB: Func: void bzero(void *, size_t) */ +ENTRY(bzero) + mov r3, #0x00 +#else +#if defined(__minix) +/* LINTSTUB: Func: void *phys_memset(void *, int, size_t) */ +ENTRY(phys_memset) +#else +/* LINTSTUB: Func: void *memset(void *, int, size_t) */ +ENTRY(memset) +#endif + and r3, r1, #0xff /* We deal with bytes */ + mov r1, r2 +#endif + cmp r1, #0x04 /* Do we have less than 4 bytes */ + mov ip, r0 + blt .Lmemset_lessthanfour + + /* Ok first we will word align the address */ + ands r2, ip, #0x03 /* Get the bottom two bits */ + bne .Lmemset_wordunaligned /* The address is not word aligned */ + + /* We are now word aligned */ +.Lmemset_wordaligned: +#ifndef _BZERO + orr r3, r3, r3, lsl #8 /* Extend value to 16-bits */ +#endif +#ifdef __XSCALE__ + tst ip, #0x04 /* Quad-align for Xscale */ +#else + cmp r1, #0x10 +#endif +#ifndef _BZERO + orr r3, r3, r3, lsl #16 /* Extend value to 32-bits */ +#endif +#ifdef __XSCALE__ + subne r1, r1, #0x04 /* Quad-align if necessary */ + strne r3, [ip], #0x04 + cmp r1, #0x10 +#endif + blt .Lmemset_loop4 /* If less than 16 then use words */ + mov r2, r3 /* Duplicate data */ + cmp r1, #0x80 /* If < 128 then skip the big loop */ + blt .Lmemset_loop32 + + /* Do 128 bytes at a time */ +.Lmemset_loop128: + subs r1, r1, #0x80 +#ifdef __XSCALE__ + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 +#else + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} +#endif + bgt .Lmemset_loop128 +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) /* Zero length so just exit */ + + add r1, r1, #0x80 /* Adjust for extra sub */ + + /* Do 32 bytes at a time */ +.Lmemset_loop32: + subs r1, r1, #0x20 +#ifdef __XSCALE__ + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 +#else + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} +#endif + bgt .Lmemset_loop32 +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) /* Zero length so just exit */ + + adds r1, r1, #0x10 /* Partially adjust for extra sub */ + + /* Deal with 16 bytes or more */ +#ifdef __XSCALE__ + strged r2, [ip], #0x08 + strged r2, [ip], #0x08 +#else + stmgeia ip!, {r2-r3} + stmgeia ip!, {r2-r3} +#endif +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) /* Zero length so just exit */ + + addlt r1, r1, #0x10 /* Possibly adjust for extra sub */ + + /* We have at least 4 bytes so copy as words */ +.Lmemset_loop4: + subs r1, r1, #0x04 + strge r3, [ip], #0x04 + bgt .Lmemset_loop4 +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) /* Zero length so just exit */ + +#ifdef __XSCALE__ + /* Compensate for 64-bit alignment check */ + adds r1, r1, #0x04 +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) + cmp r1, #2 +#else + cmp r1, #-2 +#endif + + strb r3, [ip], #0x01 /* Set 1 byte */ + strgeb r3, [ip], #0x01 /* Set another byte */ + strgtb r3, [ip] /* and a third */ +#if defined(__minix) + mov r0, #0 +#endif + RET /* Exit */ + +.Lmemset_wordunaligned: + rsb r2, r2, #0x004 + strb r3, [ip], #0x01 /* Set 1 byte */ + cmp r2, #0x02 + strgeb r3, [ip], #0x01 /* Set another byte */ + sub r1, r1, r2 + strgtb r3, [ip], #0x01 /* and a third */ + cmp r1, #0x04 /* More than 4 bytes left? */ + bge .Lmemset_wordaligned /* Yup */ + +.Lmemset_lessthanfour: + cmp r1, #0x00 +#if defined(__minix) + moveq r0, #0 +#endif + RETc(eq) /* Zero length so exit */ + strb r3, [ip], #0x01 /* Set 1 byte */ + cmp r1, #0x02 + strgeb r3, [ip], #0x01 /* Set another byte */ + strgtb r3, [ip] /* and a third */ +#if defined(__minix) + mov r0, #0 +#endif + RET /* Exit */ + +#if defined(__minix) +LABEL(memset_fault) /* kernel can send us here */ + mov r0, #0 + RET + +LABEL(memset_fault_in_kernel) /* kernel can send us here */ + mrc p15, 0, r0, c6, c0, 0 /* Read DFAR */ + RET +#endif diff --git a/kernel/arch/arm/pre_init.c b/kernel/arch/arm/pre_init.c new file mode 100644 index 000000000..970e44d4a --- /dev/null +++ b/kernel/arch/arm/pre_init.c @@ -0,0 +1,240 @@ + +#define UNPAGED 1 /* for proper kmain() prototype */ + +#include "kernel.h" +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "string.h" +#include "arch_proto.h" +#include "libexec.h" +#include "direct_utils.h" +#include "serial.h" +#include "glo.h" +#include + +#if USE_SYSDEBUG +#define MULTIBOOT_VERBOSE 1 +#endif + +/* to-be-built kinfo struct, diagnostics buffer */ +kinfo_t kinfo; +struct kmessages kmessages; + +/* pg_utils.c uses this; in this phase, there is a 1:1 mapping. */ +phys_bytes vir2phys(void *addr) { return (phys_bytes) addr; } + +/* String length used for mb_itoa */ +#define ITOA_BUFFER_SIZE 20 + +/* Kernel may use memory */ +int kernel_may_alloc = 1; + +static int mb_set_param(char *bigbuf, char *name, char *value, kinfo_t *cbi) +{ + char *p = bigbuf; + char *bufend = bigbuf + MULTIBOOT_PARAM_BUF_SIZE; + char *q; + int namelen = strlen(name); + int valuelen = strlen(value); + + /* Some variables we recognize */ + if(!strcmp(name, SERVARNAME)) { cbi->do_serial_debug = 1; } + if(!strcmp(name, SERBAUDVARNAME)) { cbi->serial_debug_baud = atoi(value); } + + /* Delete the item if already exists */ + while (*p) { + if (strncmp(p, name, namelen) == 0 && p[namelen] == '=') { + q = p; + while (*q) q++; + for (q++; q < bufend; q++, p++) + *p = *q; + break; + } + while (*p++) + ; + p++; + } + + for (p = bigbuf; p < bufend && (*p || *(p + 1)); p++) + ; + if (p > bigbuf) p++; + + /* Make sure there's enough space for the new parameter */ + if (p + namelen + valuelen + 3 > bufend) + return -1; + + strcpy(p, name); + p[namelen] = '='; + strcpy(p + namelen + 1, value); + p[namelen + valuelen + 1] = 0; + p[namelen + valuelen + 2] = 0; + return 0; +} + +int overlaps(multiboot_module_t *mod, int n, int cmp_mod) +{ + multiboot_module_t *cmp = &mod[cmp_mod]; + int m; + +#define INRANGE(mod, v) ((v) >= mod->mod_start && (v) <= thismod->mod_end) +#define OVERLAP(mod1, mod2) (INRANGE(mod1, mod2->mod_start) || \ + INRANGE(mod1, mod2->mod_end)) + for(m = 0; m < n; m++) { + multiboot_module_t *thismod = &mod[m]; + if(m == cmp_mod) continue; + if(OVERLAP(thismod, cmp)) + return 1; + } + return 0; +} + +void get_parameters(u32_t ebx, kinfo_t *cbi) +{ + multiboot_memory_map_t *mmap; + multiboot_info_t *mbi = &cbi->mbi; + int var_i,value_i, m, k; + char *p; + extern char _kern_phys_base, _kern_vir_base, _kern_size, + _kern_unpaged_start, _kern_unpaged_end; + phys_bytes kernbase = (phys_bytes) &_kern_phys_base, + kernsize = (phys_bytes) &_kern_size; +#define BUF 1024 + static char cmdline[BUF]; + + /* get our own copy of the multiboot info struct and module list */ + memcpy((void *) mbi, (void *) ebx, sizeof(*mbi)); + + /* Set various bits of info for the higher-level kernel. */ + cbi->mem_high_phys = 0; + cbi->user_sp = (vir_bytes) &_kern_vir_base; + cbi->vir_kern_start = (vir_bytes) &_kern_vir_base; + cbi->bootstrap_start = (vir_bytes) &_kern_unpaged_start; + cbi->bootstrap_len = (vir_bytes) &_kern_unpaged_end - + cbi->bootstrap_start; + cbi->kmess = &kmess; + + /* set some configurable defaults */ + cbi->do_serial_debug = 1; + cbi->serial_debug_baud = 115200; + + /* parse boot command line */ + if (mbi->flags&MULTIBOOT_INFO_CMDLINE) { + static char var[BUF]; + static char value[BUF]; + + /* Override values with cmdline argument */ + memcpy(cmdline, (void *) mbi->cmdline, BUF); + p = cmdline; + while (*p) { + var_i = 0; + value_i = 0; + while (*p == ' ') p++; + if (!*p) break; + while (*p && *p != '=' && *p != ' ' && var_i < BUF - 1) + var[var_i++] = *p++ ; + var[var_i] = 0; + if (*p++ != '=') continue; /* skip if not name=value */ + while (*p && *p != ' ' && value_i < BUF - 1) + value[value_i++] = *p++ ; + value[value_i] = 0; + + mb_set_param(cbi->param_buf, var, value, cbi); + } + } + + /* round user stack down to leave a gap to catch kernel + * stack overflow; and to distinguish kernel and user addresses + * at a glance (0xf.. vs 0xe..) + */ + cbi->user_sp &= 0xF0000000; + cbi->user_end = cbi->user_sp; + + /* kernel bytes without bootstrap code/data that is currently + * still needed but will be freed after bootstrapping. + */ + kinfo.kernel_allocated_bytes = (phys_bytes) &_kern_size; + + assert(!(cbi->bootstrap_start % ARM_PAGE_SIZE)); + cbi->bootstrap_len = rounddown(cbi->bootstrap_len, ARM_PAGE_SIZE); + assert(mbi->flags & MULTIBOOT_INFO_MODS); + assert(mbi->mods_count < MULTIBOOT_MAX_MODS); + assert(mbi->mods_count > 0); + memcpy(&cbi->module_list, (void *) mbi->mods_addr, + mbi->mods_count * sizeof(multiboot_module_t)); + + memset(cbi->memmap, 0, sizeof(cbi->memmap)); + /* mem_map has a variable layout */ + if(mbi->flags & MULTIBOOT_INFO_MEM_MAP) { + cbi->mmap_size = 0; + for (mmap = (multiboot_memory_map_t *) mbi->mmap_addr; + (unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length; + mmap = (multiboot_memory_map_t *) + ((unsigned long) mmap + mmap->size + sizeof(mmap->size))) { + if(mmap->type != MULTIBOOT_MEMORY_AVAILABLE) continue; + add_memmap(cbi, mmap->addr, mmap->len); + } + } else { + assert(mbi->flags & MULTIBOOT_INFO_MEMORY); + add_memmap(cbi, 0, mbi->mem_lower_unused*1024); + add_memmap(cbi, 0x100000, mbi->mem_upper_unused*1024); + } + + /* Sanity check: the kernel nor any of the modules may overlap + * with each other. Pretend the kernel is an extra module for a + * second. + */ + k = mbi->mods_count; + assert(k < MULTIBOOT_MAX_MODS); + cbi->module_list[k].mod_start = kernbase; + cbi->module_list[k].mod_end = kernbase + kernsize; + cbi->mods_with_kernel = mbi->mods_count+1; + cbi->kern_mod = k; + + for(m = 0; m < cbi->mods_with_kernel; m++) { +#if 0 + printf("checking overlap of module %08lx-%08lx\n", + cbi->module_list[m].mod_start, cbi->module_list[m].mod_end); +#endif + if(overlaps(cbi->module_list, cbi->mods_with_kernel, m)) + panic("overlapping boot modules/kernel"); + /* We cut out the bits of memory that we know are + * occupied by the kernel and boot modules. + */ + cut_memmap(cbi, + cbi->module_list[m].mod_start, + cbi->module_list[m].mod_end); + } +} + +kinfo_t *pre_init(u32_t magic, u32_t ebx) +{ + /* Get our own copy boot params pointed to by ebx. + * Here we find out whether we should do serial output. + */ + get_parameters(ebx, &kinfo); + + /* Make and load a pagetable that will map the kernel + * to where it should be; but first a 1:1 mapping so + * this code stays where it should be. + */ + pg_clear(); + pg_identity(&kinfo); + kinfo.freepde_start = pg_mapkernel(); + pg_load(); + vm_enable_paging(); + + /* Done, return boot info so it can be passed to kmain(). */ + return &kinfo; +} + +int send_sig(endpoint_t proc_nr, int sig_nr) { return 0; } +void minix_shutdown(timer_t *t) { arch_shutdown(RBT_PANIC); } +void busy_delay_ms(int x) { } + diff --git a/kernel/arch/arm/procoffsets.cf b/kernel/arch/arm/procoffsets.cf new file mode 100644 index 000000000..3f592535a --- /dev/null +++ b/kernel/arch/arm/procoffsets.cf @@ -0,0 +1,24 @@ + +include "kernel.h" +include "proc.h" + +struct proc +member REG0 p_reg.retreg +member REG1 p_reg.r1 +member REG2 p_reg.r2 +member REG3 p_reg.r3 +member REG4 p_reg.r4 +member REG5 p_reg.r5 +member REG6 p_reg.r6 +member REG7 p_reg.r7 +member REG8 p_reg.r8 +member REG9 p_reg.r9 +member REG10 p_reg.r10 +member FPREG p_reg.fp +member REG12 p_reg.r12 +member SPREG p_reg.sp +member LRREG p_reg.lr +member PCREG p_reg.pc +member PSREG p_reg.psr +member P_TTBR p_seg.p_ttbr + diff --git a/kernel/arch/arm/protect.c b/kernel/arch/arm/protect.c new file mode 100644 index 000000000..c2afc447e --- /dev/null +++ b/kernel/arch/arm/protect.c @@ -0,0 +1,159 @@ +/* This file contains code for initialization of protected mode, to initialize + * code and data segment descriptors, and to initialize global descriptors + * for local descriptors in the process table. + */ + +#include +#include +#include + +#include "kernel/kernel.h" +#include "kernel/proc.h" +#include "archconst.h" + +#include "arch_proto.h" + +#include + +struct tss_s tss[CONFIG_MAX_CPUS]; +extern int exc_vector_table; + +int prot_init_done = 0; + +phys_bytes vir2phys(void *vir) +{ + extern char _kern_vir_base, _kern_phys_base; /* in kernel.lds */ + u32_t offset = (vir_bytes) &_kern_vir_base - + (vir_bytes) &_kern_phys_base; + return (phys_bytes)vir - offset; +} + +int tss_init(unsigned cpu, void * kernel_stack) +{ + + struct tss_s * t = &tss[cpu]; + + /* + * make space for process pointer and cpu id and point to the first + * usable word + */ + t->sp0 = ((unsigned) kernel_stack) - ARM_STACK_TOP_RESERVED; + /* + * set the cpu id at the top of the stack so we know on which cpu is + * this stak in use when we trap to kernel + */ + *((reg_t *)(t->sp0 + 1 * sizeof(reg_t))) = cpu; + + return 0; +} + +multiboot_module_t *bootmod(int pnr) +{ + int i; + + assert(pnr >= 0); + + /* Search for desired process in boot process + * list. The first NR_TASKS ones do not correspond + * to a module, however, so we don't search those. + */ + for(i = NR_TASKS; i < NR_BOOT_PROCS; i++) { + int p; + p = i - NR_TASKS; + if(image[i].proc_nr == pnr) { + assert(p < MULTIBOOT_MAX_MODS); + assert(p < kinfo.mbi.mods_count); + return &kinfo.module_list[p]; + } + } + + panic("boot module %d not found", pnr); +} + +int booting_cpu = 0; + +void prot_init() +{ + write_vbar((reg_t)&exc_vector_table); + + /* Set up a new post-relocate bootstrap pagetable so that + * we can map in VM, and we no longer rely on pre-relocated + * data. + */ + + pg_clear(); + pg_identity(&kinfo); /* Still need 1:1 for device memory . */ + pg_mapkernel(); + pg_load(); + + prot_init_done = 1; +} + +static int alloc_for_vm = 0; + +void arch_post_init(void) +{ + /* Let memory mapping code know what's going on at bootstrap time */ + struct proc *vm; + vm = proc_addr(VM_PROC_NR); + get_cpulocal_var(ptproc) = vm; + pg_info(&vm->p_seg.p_ttbr, &vm->p_seg.p_ttbr_v); +} + +int libexec_pg_alloc(struct exec_info *execi, off_t vaddr, size_t len) +{ + pg_map(PG_ALLOCATEME, vaddr, vaddr+len, &kinfo); + pg_load(); + memset((char *) vaddr, 0, len); + alloc_for_vm += len; + return OK; +} + +void arch_boot_proc(struct boot_image *ip, struct proc *rp) +{ + multiboot_module_t *mod; + + if(rp->p_nr < 0) return; + + mod = bootmod(rp->p_nr); + + /* Important special case: we put VM in the bootstrap pagetable + * so it can run. + */ + + if(rp->p_nr == VM_PROC_NR) { + struct exec_info execi; + + memset(&execi, 0, sizeof(execi)); + + /* exec parameters */ + execi.stack_high = kinfo.user_sp; + execi.stack_size = 32 * 1024; /* not too crazy as it must be preallocated */ + execi.proc_e = ip->endpoint; + execi.hdr = (char *) mod->mod_start; /* phys mem direct */ + execi.hdr_len = mod->mod_end - mod->mod_start; + strcpy(execi.progname, ip->proc_name); + execi.frame_len = 0; + + /* callbacks for use in the kernel */ + execi.copymem = libexec_copy_memcpy; + execi.clearmem = libexec_clear_memset; + execi.allocmem_prealloc = libexec_pg_alloc; + execi.allocmem_ondemand = libexec_pg_alloc; + execi.clearproc = NULL; + + /* parse VM ELF binary and alloc/map it into bootstrap pagetable */ + libexec_load_elf(&execi); + + /* Initialize the server stack pointer. Take it down three words + * to give startup code something to use as "argc", "argv" and "envp". + */ + arch_proc_init(rp, execi.pc, kinfo.user_sp - 3*4, ip->proc_name); + + /* Free VM blob that was just copied into existence. */ + cut_memmap(&kinfo, mod->mod_start, mod->mod_end); + + /* Remember them */ + kinfo.vm_allocated_bytes = alloc_for_vm; + } +} diff --git a/kernel/arch/arm/sconst.h b/kernel/arch/arm/sconst.h new file mode 100644 index 000000000..6282717ab --- /dev/null +++ b/kernel/arch/arm/sconst.h @@ -0,0 +1,7 @@ +#ifndef __SCONST_H__ +#define __SCONST_H__ + +#include "kernel/const.h" +#include "kernel/procoffsets.h" + +#endif /* __SCONST_H__ */ diff --git a/kernel/arch/arm/serial.h b/kernel/arch/arm/serial.h new file mode 100644 index 000000000..d403ee4ad --- /dev/null +++ b/kernel/arch/arm/serial.h @@ -0,0 +1,7 @@ + +#ifndef _KERN_SERIAL_H +#define _KERN_SERIAL_H + +#include "omap_serial.h" + +#endif diff --git a/kernel/arch/arm/timer.h b/kernel/arch/arm/timer.h new file mode 100644 index 000000000..df911b57b --- /dev/null +++ b/kernel/arch/arm/timer.h @@ -0,0 +1,7 @@ + +#ifndef _KERN_TIMER_H +#define _KERN_TIMER_H + +#include "omap_timer.h" + +#endif diff --git a/kernel/arch/i386/arch_clock.c b/kernel/arch/i386/arch_clock.c index b7b7c1ec3..62111f360 100644 --- a/kernel/arch/i386/arch_clock.c +++ b/kernel/arch/i386/arch_clock.c @@ -68,6 +68,10 @@ void stop_8253A_timer(void) outb(TIMER0, 0); } +void arch_timer_int_handler(void) +{ +} + static int calib_cpu_handler(irq_hook_t * UNUSED(hook)) { u64_t tsc; diff --git a/kernel/arch/i386/include/arch_clock.h b/kernel/arch/i386/include/arch_clock.h index a768c71a3..dfdcbd038 100644 --- a/kernel/arch/i386/include/arch_clock.h +++ b/kernel/arch/i386/include/arch_clock.h @@ -5,5 +5,6 @@ int init_8253A_timer(unsigned freq); void stop_8253A_timer(void); +void arch_timer_int_handler(void); #endif /* __CLOCK_X86_H__ */ diff --git a/kernel/clock.c b/kernel/clock.c index 7d478eec7..2ea4c17d0 100644 --- a/kernel/clock.c +++ b/kernel/clock.c @@ -146,6 +146,8 @@ int timer_int_handler(void) } + arch_timer_int_handler(); + return(1); /* reenable interrupts */ } diff --git a/kernel/debug.c b/kernel/debug.c index ad51a69c1..9f8936328 100644 --- a/kernel/debug.c +++ b/kernel/debug.c @@ -251,12 +251,16 @@ void print_proc(struct proc *pp) endpoint_t dep; printf("%d: %s %d prio %d time %d/%d cycles 0x%x%08x cpu %2d " - "cr3 0x%lx rts %s misc %s sched %s ", + "pdbr 0x%lx rts %s misc %s sched %s ", proc_nr(pp), pp->p_name, pp->p_endpoint, pp->p_priority, pp->p_user_time, pp->p_sys_time, ex64hi(pp->p_cycles), ex64lo(pp->p_cycles), pp->p_cpu, +#if defined(__i386__) pp->p_seg.p_cr3, +#elif defined(__arm__) + pp->p_seg.p_ttbr, +#endif rtsflagstr(pp->p_rts_flags), miscflagstr(pp->p_misc_flags), schedulerstr(pp->p_scheduler)); diff --git a/kernel/proc.c b/kernel/proc.c index 1fff91c30..0518551e1 100644 --- a/kernel/proc.c +++ b/kernel/proc.c @@ -380,7 +380,11 @@ check_misc_flags: */ p->p_misc_flags &= ~MF_CONTEXT_SET; +#if defined(__i386__) assert(p->p_seg.p_cr3 != 0); +#elif defined(__arm__) + assert(p->p_seg.p_ttbr != 0); +#endif #ifdef CONFIG_SMP if (p->p_misc_flags & MF_FLUSH_TLB) { if (tlb_must_refresh) diff --git a/kernel/system.c b/kernel/system.c index cb6ef14e8..8fd7de33a 100644 --- a/kernel/system.c +++ b/kernel/system.c @@ -209,8 +209,10 @@ void system_init(void) /* Device I/O. */ map(SYS_IRQCTL, do_irqctl); /* interrupt control operations */ +#if defined(__i386__) map(SYS_DEVIO, do_devio); /* inb, inw, inl, outb, outw, outl */ map(SYS_VDEVIO, do_vdevio); /* vector with devio requests */ +#endif /* Memory management. */ map(SYS_MEMSET, do_memset); /* write char to memory area */ @@ -255,11 +257,11 @@ void system_init(void) map(SYS_READBIOS, do_readbios); /* read from BIOS locations */ map(SYS_IOPENABLE, do_iopenable); /* Enable I/O */ map(SYS_SDEVIO, do_sdevio); /* phys_insb, _insw, _outsb, _outsw */ +#endif /* Machine state switching. */ map(SYS_SETMCONTEXT, do_setmcontext); /* set machine context */ map(SYS_GETMCONTEXT, do_getmcontext); /* get machine context */ -#endif /* Scheduling */ map(SYS_SCHEDULE, do_schedule); /* reschedule a process */ diff --git a/kernel/system/Makefile.inc b/kernel/system/Makefile.inc index 50f4e41b3..dc452d291 100644 --- a/kernel/system/Makefile.inc +++ b/kernel/system/Makefile.inc @@ -15,8 +15,6 @@ SRCS+= \ do_stime.c \ do_vtimer.c \ do_irqctl.c \ - do_devio.c \ - do_vdevio.c \ do_copy.c \ do_umap.c \ do_umap_remote.c \ @@ -42,3 +40,9 @@ SRCS+= \ do_schedctl.c \ do_statectl.c +.if ${MACHINE_ARCH} == "i386" +SRCS+= \ + do_devio.c \ + do_vdevio.c +.endif + diff --git a/kernel/system/do_fork.c b/kernel/system/do_fork.c index 1ba3369a0..dfad1db37 100644 --- a/kernel/system/do_fork.c +++ b/kernel/system/do_fork.c @@ -71,7 +71,9 @@ int do_fork(struct proc * caller, message * m_ptr) rpc->p_user_time = 0; /* set all the accounting times to 0 */ rpc->p_sys_time = 0; +#if defined(__i386__) rpc->p_reg.psw &= ~TRACEBIT; /* clear trace bit */ +#endif rpc->p_misc_flags &= ~(MF_VIRT_TIMER | MF_PROF_TIMER | MF_SC_TRACE | MF_SPROF_SEEN); rpc->p_virt_left = 0; /* disable, clear the process-virtual timers */ @@ -116,8 +118,13 @@ int do_fork(struct proc * caller, message * m_ptr) RTS_UNSET(rpc, (RTS_SIGNALED | RTS_SIG_PENDING | RTS_P_STOP)); (void) sigemptyset(&rpc->p_pending); +#if defined(__i386__) rpc->p_seg.p_cr3 = 0; rpc->p_seg.p_cr3_v = NULL; +#elif defined(__arm__) + rpc->p_seg.p_ttbr = 0; + rpc->p_seg.p_ttbr_v = NULL; +#endif return OK; } diff --git a/kernel/system/do_sigreturn.c b/kernel/system/do_sigreturn.c index f96a727be..b3603179c 100644 --- a/kernel/system/do_sigreturn.c +++ b/kernel/system/do_sigreturn.c @@ -34,9 +34,11 @@ int do_sigreturn(struct proc * caller, message * m_ptr) KERNEL, (vir_bytes) &sc, sizeof(struct sigcontext))) != OK) return r; +#if defined(__i386__) /* Restore user bits of psw from sc, maintain system bits from proc. */ sc.sc_psw = (sc.sc_psw & X86_FLAGS_USER) | (rp->p_reg.psw & ~X86_FLAGS_USER); +#endif #if defined(__i386__) /* Don't panic kernel if user gave bad selectors. */ diff --git a/kernel/system/do_trace.c b/kernel/system/do_trace.c index 10dd4bcb9..83f30c5b6 100644 --- a/kernel/system/do_trace.c +++ b/kernel/system/do_trace.c @@ -87,7 +87,9 @@ int do_trace(struct proc * caller, message * m_ptr) switch (tr_request) { case T_STOP: /* stop process */ RTS_SET(rp, RTS_P_STOP); +#if defined(__i386__) rp->p_reg.psw &= ~TRACEBIT; /* clear trace bit */ +#endif rp->p_misc_flags &= ~MF_SC_TRACE; /* clear syscall trace flag */ return(OK); @@ -148,11 +150,13 @@ int do_trace(struct proc * caller, message * m_ptr) i == (int) &((struct proc *) 0)->p_reg.ss) return(EFAULT); #endif +#if defined(__i386__) if (i == (int) &((struct proc *) 0)->p_reg.psw) /* only selected bits are changeable */ SETPSW(rp, tr_data); else *(reg_t *) ((char *) &rp->p_reg + i) = (reg_t) tr_data; +#endif m_ptr->CTL_DATA = 0; break; @@ -166,7 +170,9 @@ int do_trace(struct proc * caller, message * m_ptr) break; case T_STEP: /* set trace bit */ +#if defined(__i386__) rp->p_reg.psw |= TRACEBIT; +#endif RTS_UNSET(rp, RTS_P_STOP); m_ptr->CTL_DATA = 0; break; diff --git a/lib/libc/arch/arm/sys-minix/_ipc.S b/lib/libc/arch/arm/sys-minix/_ipc.S index e431270cd..352f33ce8 100644 --- a/lib/libc/arch/arm/sys-minix/_ipc.S +++ b/lib/libc/arch/arm/sys-minix/_ipc.S @@ -4,7 +4,7 @@ /**========================================================================* */ /* IPC assembly routines * */ /**========================================================================* */ -ENTRY(_send) +ENTRY(_send_orig) push {fp} mov fp, sp mov r2, r1 /* r2 = msg ptr */ @@ -15,7 +15,7 @@ ENTRY(_send) pop {fp} bx lr -ENTRY(_receive) +ENTRY(_receive_orig) push {fp} mov fp, sp push {r2} /* save status ptr */ @@ -29,7 +29,7 @@ ENTRY(_receive) pop {fp} bx lr -ENTRY(_sendrec) +ENTRY(_sendrec_orig) push {fp} mov fp, sp mov r2, r1 /* r2 = msg ptr */ @@ -55,7 +55,7 @@ ENTRY(_minix_kernel_info_struct) pop {fp} bx lr -ENTRY(_notify) +ENTRY(_notify_orig) push {fp} mov fp, sp mov r1, r0 /* r1 = src_dest */ @@ -65,7 +65,7 @@ ENTRY(_notify) pop {fp} bx lr -ENTRY(_sendnb) +ENTRY(_sendnb_orig) push {fp} mov fp, sp mov r2, r1 /* r2 = msg ptr */ @@ -77,7 +77,7 @@ ENTRY(_sendnb) bx lr -ENTRY(_do_kernel_call) +ENTRY(_do_kernel_call_orig) /* r0 already holds msg ptr */ mov r3, #KERVEC /* r3 determines the SVC type */ svc #0 /* trap to kernel */ diff --git a/lib/libc/arch/arm/sys-minix/_senda.S b/lib/libc/arch/arm/sys-minix/_senda.S index f91eb4fd8..7301bacb4 100644 --- a/lib/libc/arch/arm/sys-minix/_senda.S +++ b/lib/libc/arch/arm/sys-minix/_senda.S @@ -1,7 +1,7 @@ #include #include -ENTRY(_senda) +ENTRY(_senda_orig) push {fp} mov fp, sp mov r2, r0 /* r2 = table */ diff --git a/servers/vm/arch/arm/Makefile.inc b/servers/vm/arch/arm/Makefile.inc new file mode 100644 index 000000000..f3d71c80b --- /dev/null +++ b/servers/vm/arch/arm/Makefile.inc @@ -0,0 +1,5 @@ +.include + +#Arch-specific sources +.PATH: ${.CURDIR}/arch/${MACHINE_ARCH} +SRCS+= pagetable.c #util.S diff --git a/servers/vm/arch/arm/memory.h b/servers/vm/arch/arm/memory.h new file mode 100644 index 000000000..4ceb0464e --- /dev/null +++ b/servers/vm/arch/arm/memory.h @@ -0,0 +1,12 @@ +#include + +/* And what is the highest addressable piece of memory, when in paged + * mode? + */ +#define VM_DATATOP kernel_boot_info.user_end +#define VM_STACKTOP kernel_boot_info.user_sp + +#define SLAB_PAGESIZE ARM_PAGE_SIZE +#define VM_PAGE_SIZE ARM_PAGE_SIZE + +#define CLICKSPERPAGE (ARM_PAGE_SIZE/CLICK_SIZE) diff --git a/servers/vm/arch/arm/pagefaults.h b/servers/vm/arch/arm/pagefaults.h new file mode 100644 index 000000000..757cb7fb6 --- /dev/null +++ b/servers/vm/arch/arm/pagefaults.h @@ -0,0 +1,14 @@ + +#ifndef _PAGEFAULTS_H +#define _PAGEFAULTS_H 1 + +#include + +#define PFERR_PROT(e) ((ARM_VM_PFE_FS(e) == ARM_VM_PFE_L1PERM) \ + || (ARM_VM_PFE_FS(e) == ARM_VM_PFE_L2PERM)) +#define PFERR_NOPAGE(e) (!PFERR_PROT(e)) +#define PFERR_WRITE(e) ((e) & ARM_VM_PFE_W) +#define PFERR_READ(e) (!((e) & ARM_VM_PFE_W)) + +#endif + diff --git a/servers/vm/arch/arm/pagetable.c b/servers/vm/arch/arm/pagetable.c new file mode 100644 index 000000000..841fd4137 --- /dev/null +++ b/servers/vm/arch/arm/pagetable.c @@ -0,0 +1,1261 @@ + +#define _SYSTEM 1 +#define _POSIX_SOURCE 1 + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "proto.h" +#include "glo.h" +#include "util.h" +#include "vm.h" +#include "sanitycheck.h" + +#include "memory.h" + +static int vm_self_pages; + +/* PDE used to map in kernel, kernel physical address. */ +static int pagedir_pde = -1; +static u32_t pagedir_pde_val; + +static multiboot_module_t *kern_mb_mod = NULL; +static size_t kern_size = 0; +static int kern_start_pde = -1; + +/* 1MB page size available in hardware? */ +static int bigpage_ok = 1; + +/* Our process table entry. */ +struct vmproc *vmprocess = &vmproc[VM_PROC_NR]; + +/* Spare memory, ready to go after initialization, to avoid a + * circular dependency on allocating memory and writing it into VM's + * page table. + */ +#define SPAREPAGEDIRS 11 +#define STATIC_SPAREPAGEDIRS 10 +#define SPAREPAGES 250 +#define STATIC_SPAREPAGES 100 +int missing_sparedirs = SPAREPAGEDIRS; +static struct { + void *pagedir; + phys_bytes phys; +} sparepagedirs[SPAREPAGEDIRS]; + +int missing_spares = SPAREPAGES; +static struct { + void *page; + phys_bytes phys; +} sparepages[SPAREPAGES]; + +extern char _end; +#define is_staticaddr(v) ((vir_bytes) (v) < (vir_bytes) &_end) + +#define MAX_KERNMAPPINGS 10 +static struct { + phys_bytes phys_addr; /* Physical addr. */ + phys_bytes len; /* Length in bytes. */ + vir_bytes vir_addr; /* Offset in page table. */ + int flags; +} kern_mappings[MAX_KERNMAPPINGS]; +int kernmappings = 0; + +/* Clicks must be pages, as + * - they must be page aligned to map them + * - they must be a multiple of the page size + * - it's inconvenient to have them bigger than pages, because we often want + * just one page + * May as well require them to be equal then. + */ +#if CLICK_SIZE != ARM_PAGE_SIZE +#error CLICK_SIZE must be page size. +#endif + +/* Page table that contains pointers to all page directories. */ +phys_bytes page_directories_phys; +u32_t *page_directories = NULL; + +static char static_sparepagedirs[ARM_PAGEDIR_SIZE*STATIC_SPAREPAGEDIRS + ARM_PAGEDIR_SIZE] __aligned(ARM_PAGEDIR_SIZE); + +static char static_sparepages[ARM_PAGE_SIZE*STATIC_SPAREPAGES] __aligned(ARM_PAGE_SIZE); + +#if SANITYCHECKS +/*===========================================================================* + * pt_sanitycheck * + *===========================================================================*/ +void pt_sanitycheck(pt_t *pt, char *file, int line) +{ +/* Basic pt sanity check. */ + int slot; + + MYASSERT(pt); + MYASSERT(pt->pt_dir); + MYASSERT(pt->pt_dir_phys); + + for(slot = 0; slot < ELEMENTS(vmproc); slot++) { + if(pt == &vmproc[slot].vm_pt) + break; + } + + if(slot >= ELEMENTS(vmproc)) { + panic("pt_sanitycheck: passed pt not in any proc"); + } + + MYASSERT(usedpages_add(pt->pt_dir_phys, ARM_PAGE_SIZE) == OK); +} +#endif + +/*===========================================================================* + * findhole * + *===========================================================================*/ +static u32_t findhole(int pages) +{ +/* Find a space in the virtual address space of VM. */ + u32_t curv; + int pde = 0, try_restart; + static u32_t lastv = 0; + pt_t *pt = &vmprocess->vm_pt; + vir_bytes vmin, vmax; + u32_t holev; + + vmin = (vir_bytes) (&_end) & ARM_VM_ADDR_MASK; /* marks end of VM BSS */ + vmax = VM_STACKTOP; + + /* Input sanity check. */ + assert(vmin + ARM_PAGE_SIZE >= vmin); + assert(vmax >= vmin + ARM_PAGE_SIZE); + assert((vmin % ARM_PAGE_SIZE) == 0); + assert((vmax % ARM_PAGE_SIZE) == 0); + assert(pages > 0); + +#if SANITYCHECKS + curv = ((u32_t) random()) % ((vmax - vmin)/ARM_PAGE_SIZE); + curv *= ARM_PAGE_SIZE; + curv += vmin; +#else + curv = lastv; + if(curv < vmin || curv >= vmax) + curv = vmin; +#endif + try_restart = 1; + + /* Start looking for a free page starting at vmin. */ + while(curv < vmax) { + int pte; + int i, nohole; + + assert(curv >= vmin); + assert(curv < vmax); + + holev = curv; /* the candidate hole */ + nohole = 0; + for (i = 0; i < pages && !nohole; ++i) { + if(curv >= vmax) { + break; + } + + pde = ARM_VM_PDE(curv); + pte = ARM_VM_PTE(curv); + + /* if page present, no hole */ + if((pt->pt_dir[pde] & ARM_VM_PDE_PRESENT) && + (pt->pt_pt[pde][pte] & ARM_VM_PTE_PRESENT)) + nohole = 1; + + /* if not contiguous, no hole */ + if (curv != holev + i * ARM_PAGE_SIZE) + nohole = 1; + + curv+=ARM_PAGE_SIZE; + } + + /* there's a large enough hole */ + if (!nohole && i == pages) { + lastv = curv; + return holev; + } + + /* Reset curv */ + if(curv >= vmax && try_restart) { + curv = vmin; + try_restart = 0; + } + } + + printf("VM: out of virtual address space in vm\n"); + + return NO_MEM; +} + +/*===========================================================================* + * vm_freepages * + *===========================================================================*/ +void vm_freepages(vir_bytes vir, int pages) +{ + assert(!(vir % ARM_PAGE_SIZE)); + + if(is_staticaddr(vir)) { + printf("VM: not freeing static page\n"); + return; + } + + if(pt_writemap(vmprocess, &vmprocess->vm_pt, vir, + MAP_NONE, pages*ARM_PAGE_SIZE, 0, + WMF_OVERWRITE | WMF_FREE) != OK) + panic("vm_freepages: pt_writemap failed"); + + vm_self_pages--; + +#if SANITYCHECKS + /* If SANITYCHECKS are on, flush tlb so accessing freed pages is + * always trapped, also if not in tlb. + */ + if((sys_vmctl(SELF, VMCTL_FLUSHTLB, 0)) != OK) { + panic("VMCTL_FLUSHTLB failed"); + } +#endif +} + +/*===========================================================================* + * vm_getsparepage * + *===========================================================================*/ +static void *vm_getsparepage(phys_bytes *phys) +{ + int s; + assert(missing_spares >= 0 && missing_spares <= SPAREPAGES); + for(s = 0; s < SPAREPAGES; s++) { + if(sparepages[s].page) { + void *sp; + sp = sparepages[s].page; + *phys = sparepages[s].phys; + sparepages[s].page = NULL; + missing_spares++; + assert(missing_spares >= 0 && missing_spares <= SPAREPAGES); + return sp; + } + } + return NULL; +} + +/*===========================================================================* + * vm_getsparepagedir * + *===========================================================================*/ +static void *vm_getsparepagedir(phys_bytes *phys) +{ + int s; + assert(missing_sparedirs >= 0 && missing_sparedirs <= SPAREPAGEDIRS); + for(s = 0; s < SPAREPAGEDIRS; s++) { + if(sparepagedirs[s].pagedir) { + void *sp; + sp = sparepagedirs[s].pagedir; + *phys = sparepagedirs[s].phys; + sparepagedirs[s].pagedir = NULL; + missing_sparedirs++; + assert(missing_sparedirs >= 0 && missing_sparedirs <= SPAREPAGEDIRS); + return sp; + } + } + return NULL; +} + +/*===========================================================================* + * vm_checkspares * + *===========================================================================*/ +static void *vm_checkspares(void) +{ + int s, n = 0; + static int total = 0, worst = 0; + assert(missing_spares >= 0 && missing_spares <= SPAREPAGES); + for(s = 0; s < SPAREPAGES && missing_spares > 0; s++) + if(!sparepages[s].page) { + n++; + if((sparepages[s].page = vm_allocpage(&sparepages[s].phys, + VMP_SPARE))) { + missing_spares--; + assert(missing_spares >= 0); + assert(missing_spares <= SPAREPAGES); + } else { + printf("VM: warning: couldn't get new spare page\n"); + } + } + if(worst < n) worst = n; + total += n; + + return NULL; +} + +/*===========================================================================* + * vm_checksparedirs * + *===========================================================================*/ +static void *vm_checksparedirs(void) +{ + int s, n = 0; + static int total = 0, worst = 0; + assert(missing_sparedirs >= 0 && missing_sparedirs <= SPAREPAGEDIRS); + for(s = 0; s < SPAREPAGEDIRS && missing_sparedirs > 0; s++) + if(!sparepagedirs[s].pagedir) { + n++; + if((sparepagedirs[s].pagedir = vm_allocpage(&sparepagedirs[s].phys, + VMP_SPARE))) { + missing_sparedirs--; + assert(missing_sparedirs >= 0); + assert(missing_sparedirs <= SPAREPAGEDIRS); + } else { + printf("VM: warning: couldn't get new spare pagedir\n"); + } + } + if(worst < n) worst = n; + total += n; + + return NULL; +} + +static int pt_init_done; + +/*===========================================================================* + * vm_allocpage * + *===========================================================================*/ +void *vm_allocpage(phys_bytes *phys, int reason) +{ +/* Allocate a page for use by VM itself. */ + phys_bytes newpage; + vir_bytes loc; + pt_t *pt; + int r; + static int level = 0; + void *ret; + u32_t mem_bytes, mem_clicks, mem_flags; + + pt = &vmprocess->vm_pt; + assert(reason >= 0 && reason < VMP_CATEGORIES); + + level++; + + assert(level >= 1); + assert(level <= 2); + + if(level > 1 || !pt_init_done) { + void *s; + + if (reason == VMP_PAGEDIR) + s=vm_getsparepagedir(phys); + else + s=vm_getsparepage(phys); + + level--; + if(!s) { + util_stacktrace(); + printf("VM: warning: out of spare pages\n"); + } + if(!is_staticaddr(s)) vm_self_pages++; + return s; + } + + if (reason == VMP_PAGEDIR) { + mem_bytes = ARM_PAGEDIR_SIZE; + mem_flags = PAF_ALIGN16K; + } else { + mem_bytes = ARM_PAGE_SIZE; + mem_flags = 0; + } + mem_clicks = mem_bytes / ARM_PAGE_SIZE * CLICKSPERPAGE; + + /* VM does have a pagetable, so get a page and map it in there. + * Where in our virtual address space can we put it? + */ + loc = findhole(mem_bytes / ARM_PAGE_SIZE); + if(loc == NO_MEM) { + level--; + printf("VM: vm_allocpage: findhole failed\n"); + return NULL; + } + + /* Allocate page of memory for use by VM. As VM + * is trusted, we don't have to pre-clear it. + */ + if((newpage = alloc_mem(mem_clicks, mem_flags)) == NO_MEM) { + level--; + printf("VM: vm_allocpage: alloc_mem failed\n"); + return NULL; + } + + *phys = CLICK2ABS(newpage); + + /* Map this page into our address space. */ + if((r=pt_writemap(vmprocess, pt, loc, *phys, mem_bytes, + ARM_VM_PTE_PRESENT | ARM_VM_PTE_USER | ARM_VM_PTE_RW | + ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE, 0)) != OK) { + free_mem(newpage, mem_clicks); + printf("vm_allocpage writemap failed\n"); + level--; + return NULL; + } + + if((r=sys_vmctl(SELF, VMCTL_FLUSHTLB, 0)) != OK) { + panic("VMCTL_FLUSHTLB failed: %d", r); + } + + level--; + + /* Return user-space-ready pointer to it. */ + ret = (void *) loc; + + vm_self_pages++; + return ret; +} + +/*===========================================================================* + * vm_pagelock * + *===========================================================================*/ +void vm_pagelock(void *vir, int lockflag) +{ +/* Mark a page allocated by vm_allocpage() unwritable, i.e. only for VM. */ + vir_bytes m = (vir_bytes) vir; + int r; + u32_t flags = ARM_VM_PTE_PRESENT | ARM_VM_PTE_USER; + pt_t *pt; + + pt = &vmprocess->vm_pt; + + assert(!(m % ARM_PAGE_SIZE)); + + if(!lockflag) + flags |= ARM_VM_PTE_RW; + else + flags |= ARM_VM_PTE_RO; + flags |= ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE; + + /* Update flags. */ + if((r=pt_writemap(vmprocess, pt, m, 0, ARM_PAGE_SIZE, + flags, WMF_OVERWRITE | WMF_WRITEFLAGSONLY)) != OK) { + panic("vm_lockpage: pt_writemap failed"); + } + + if((r=sys_vmctl(SELF, VMCTL_FLUSHTLB, 0)) != OK) { + panic("VMCTL_FLUSHTLB failed: %d", r); + } + + return; +} + +/*===========================================================================* + * vm_addrok * + *===========================================================================*/ +int vm_addrok(void *vir, int writeflag) +{ + pt_t *pt = &vmprocess->vm_pt; + int pde, pte; + vir_bytes v = (vir_bytes) vir; + + pde = ARM_VM_PDE(v); + pte = ARM_VM_PTE(v); + + if(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)) { + printf("addr not ok: missing pde %d\n", pde); + return 0; + } + + if(!(pt->pt_pt[pde][pte] & ARM_VM_PTE_PRESENT)) { + printf("addr not ok: missing pde %d / pte %d\n", + pde, pte); + return 0; + } + + if(!writeflag && + !(pt->pt_pt[pde][pte] & ARM_VM_PTE_RO)) { + printf("addr not ok: pde %d / pte %d present but writable\n", + pde, pte); + return 0; + } + + return 1; +} + +/*===========================================================================* + * pt_ptalloc * + *===========================================================================*/ +static int pt_ptalloc(pt_t *pt, int pde, u32_t flags) +{ +/* Allocate a page table and write its address into the page directory. */ + int i; + phys_bytes pt_phys; + + /* Argument must make sense. */ + assert(pde >= 0 && pde < ARM_VM_DIR_ENTRIES); + assert(!(flags & ~(PTF_ALLFLAGS))); + + /* We don't expect to overwrite page directory entry, nor + * storage for the page table. + */ + assert(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)); + assert(!pt->pt_pt[pde]); + + /* Get storage for the page table. */ + if(!(pt->pt_pt[pde] = vm_allocpage(&pt_phys, VMP_PAGETABLE))) + return ENOMEM; + + for(i = 0; i < ARM_VM_PT_ENTRIES; i++) + pt->pt_pt[pde][i] = 0; /* Empty entry. */ + + /* Make page directory entry. + * The PDE is always 'present,' 'writable,' and 'user accessible,' + * relying on the PTE for protection. + */ + pt->pt_dir[pde] = (pt_phys & ARM_VM_PDE_MASK) + | ARM_VM_PDE_PRESENT | ARM_VM_PDE_DOMAIN; + + return OK; +} + +/*===========================================================================* + * pt_ptalloc_in_range * + *===========================================================================*/ +int pt_ptalloc_in_range(pt_t *pt, vir_bytes start, vir_bytes end, + u32_t flags, int verify) +{ +/* Allocate all the page tables in the range specified. */ + int pde, first_pde, last_pde; + + first_pde = ARM_VM_PDE(start); + last_pde = ARM_VM_PDE(end-1); + assert(first_pde >= 0); + assert(last_pde < ARM_VM_DIR_ENTRIES); + + /* Scan all page-directory entries in the range. */ + for(pde = first_pde; pde <= last_pde; pde++) { + assert(!(pt->pt_dir[pde] & ARM_VM_BIGPAGE)); + if(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)) { + int r; + if(verify) { + printf("pt_ptalloc_in_range: no pde %d\n", pde); + return EFAULT; + } + assert(!pt->pt_dir[pde]); + if((r=pt_ptalloc(pt, pde, flags)) != OK) { + /* Couldn't do (complete) mapping. + * Don't bother freeing any previously + * allocated page tables, they're + * still writable, don't point to nonsense, + * and pt_ptalloc leaves the directory + * and other data in a consistent state. + */ + printf("pt_ptalloc_in_range: pt_ptalloc failed\n"); + return r; + } + } + assert(pt->pt_dir[pde]); + assert(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT); + } + + return OK; +} + +static char *ptestr(u32_t pte) +{ +#define FLAG(constant, name) { \ + if(pte & (constant)) { strcat(str, name); strcat(str, " "); } \ +} + + static char str[30]; + if(!(pte & ARM_VM_PTE_PRESENT)) { + return "not present"; + } + str[0] = '\0'; + if(pte & ARM_VM_PTE_RO) { + strcat(str, "R "); + } else { + strcat(str, "W "); + } + FLAG(ARM_VM_PTE_USER, "U"); + FLAG(ARM_VM_PTE_SUPER, "S"); + FLAG(ARM_VM_PTE_SHAREABLE, "SH"); + FLAG(ARM_VM_PTE_WB, "WB"); + FLAG(ARM_VM_PTE_WT, "WT"); + + return str; +} + +/*===========================================================================* + * pt_map_in_range * + *===========================================================================*/ +int pt_map_in_range(struct vmproc *src_vmp, struct vmproc *dst_vmp, + vir_bytes start, vir_bytes end) +{ +/* Transfer all the mappings from the pt of the source process to the pt of + * the destination process in the range specified. + */ + int pde, pte; + vir_bytes viraddr; + pt_t *pt, *dst_pt; + + pt = &src_vmp->vm_pt; + dst_pt = &dst_vmp->vm_pt; + + end = end ? end : VM_DATATOP; + assert(start % ARM_PAGE_SIZE == 0); + assert(end % ARM_PAGE_SIZE == 0); + assert(ARM_VM_PDE(start) >= 0 && start <= end); + assert(ARM_VM_PDE(end) < ARM_VM_DIR_ENTRIES); + +#if LU_DEBUG + printf("VM: pt_map_in_range: src = %d, dst = %d\n", + src_vmp->vm_endpoint, dst_vmp->vm_endpoint); + printf("VM: pt_map_in_range: transferring from 0x%08x (pde %d pte %d) to 0x%08x (pde %d pte %d)\n", + start, ARM_VM_PDE(start), ARM_VM_PTE(start), + end, ARM_VM_PDE(end), ARM_VM_PTE(end)); +#endif + + /* Scan all page-table entries in the range. */ + for(viraddr = start; viraddr <= end; viraddr += ARM_PAGE_SIZE) { + pde = ARM_VM_PDE(viraddr); + if(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)) { + if(viraddr == VM_DATATOP) break; + continue; + } + pte = ARM_VM_PTE(viraddr); + if(!(pt->pt_pt[pde][pte] & ARM_VM_PTE_PRESENT)) { + if(viraddr == VM_DATATOP) break; + continue; + } + + /* Transfer the mapping. */ + dst_pt->pt_pt[pde][pte] = pt->pt_pt[pde][pte]; + + if(viraddr == VM_DATATOP) break; + } + + return OK; +} + +/*===========================================================================* + * pt_ptmap * + *===========================================================================*/ +int pt_ptmap(struct vmproc *src_vmp, struct vmproc *dst_vmp) +{ +/* Transfer mappings to page dir and page tables from source process and + * destination process. Make sure all the mappings are above the stack, not + * to corrupt valid mappings in the data segment of the destination process. + */ + int pde, r; + phys_bytes physaddr; + vir_bytes viraddr; + pt_t *pt; + + pt = &src_vmp->vm_pt; + +#if LU_DEBUG + printf("VM: pt_ptmap: src = %d, dst = %d\n", + src_vmp->vm_endpoint, dst_vmp->vm_endpoint); +#endif + + /* Transfer mapping to the page directory. */ + viraddr = (vir_bytes) pt->pt_dir; + physaddr = pt->pt_dir_phys & ARM_VM_ADDR_MASK; + if((r=pt_writemap(dst_vmp, &dst_vmp->vm_pt, viraddr, physaddr, ARM_PAGEDIR_SIZE, + ARM_VM_PTE_PRESENT | ARM_VM_PTE_USER | ARM_VM_PTE_RW | + ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE, + WMF_OVERWRITE)) != OK) { + return r; + } +#if LU_DEBUG + printf("VM: pt_ptmap: transferred mapping to page dir: 0x%08x (0x%08x)\n", + viraddr, physaddr); +#endif + + /* Scan all non-reserved page-directory entries. */ + for(pde=0; pde < ARM_VM_DIR_ENTRIES; pde++) { + if(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)) { + continue; + } + + /* Transfer mapping to the page table. */ + viraddr = (vir_bytes) pt->pt_pt[pde]; + physaddr = pt->pt_dir[pde] & ARM_VM_PDE_MASK; + if((r=pt_writemap(dst_vmp, &dst_vmp->vm_pt, viraddr, physaddr, ARM_PAGE_SIZE, + ARM_VM_PTE_PRESENT | ARM_VM_PTE_USER | ARM_VM_PTE_RW | + ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE, + WMF_OVERWRITE)) != OK) { + return r; + } + } + + return OK; +} + +void pt_clearmapcache(void) +{ + /* Make sure kernel will invalidate tlb when using current + * pagetable (i.e. vm's) to make new mappings before new cr3 + * is loaded. + */ + if(sys_vmctl(SELF, VMCTL_CLEARMAPCACHE, 0) != OK) + panic("VMCTL_CLEARMAPCACHE failed"); +} + +/*===========================================================================* + * pt_writemap * + *===========================================================================*/ +int pt_writemap(struct vmproc * vmp, + pt_t *pt, + vir_bytes v, + phys_bytes physaddr, + size_t bytes, + u32_t flags, + u32_t writemapflags) +{ +/* Write mapping into page table. Allocate a new page table if necessary. */ +/* Page directory and table entries for this virtual address. */ + int p, pages; + int verify = 0; + int ret = OK; + +#ifdef CONFIG_SMP + int vminhibit_clear = 0; + /* FIXME + * don't do it everytime, stop the process only on the first change and + * resume the execution on the last change. Do in a wrapper of this + * function + */ + if (vmp && vmp->vm_endpoint != NONE && vmp->vm_endpoint != VM_PROC_NR && + !(vmp->vm_flags & VMF_EXITING)) { + sys_vmctl(vmp->vm_endpoint, VMCTL_VMINHIBIT_SET, 0); + vminhibit_clear = 1; + } +#endif + + if(writemapflags & WMF_VERIFY) + verify = 1; + + assert(!(bytes % ARM_PAGE_SIZE)); + assert(!(flags & ~(PTF_ALLFLAGS))); + + pages = bytes / ARM_PAGE_SIZE; + + /* MAP_NONE means to clear the mapping. It doesn't matter + * what's actually written into the PTE if ARM_VM_PRESENT + * isn't on, so we can just write MAP_NONE into it. + */ + assert(physaddr == MAP_NONE || (flags & ARM_VM_PTE_PRESENT)); + assert(physaddr != MAP_NONE || !flags); + + /* First make sure all the necessary page tables are allocated, + * before we start writing in any of them, because it's a pain + * to undo our work properly. + */ + ret = pt_ptalloc_in_range(pt, v, v + ARM_PAGE_SIZE*pages, flags, verify); + if(ret != OK) { + printf("VM: writemap: pt_ptalloc_in_range failed\n"); + goto resume_exit; + } + + /* Now write in them. */ + for(p = 0; p < pages; p++) { + u32_t entry; + int pde = ARM_VM_PDE(v); + int pte = ARM_VM_PTE(v); + + if(!v) { printf("VM: warning: making zero page for %d\n", + vmp->vm_endpoint); } + + assert(!(v % ARM_PAGE_SIZE)); + assert(pte >= 0 && pte < ARM_VM_PT_ENTRIES); + assert(pde >= 0 && pde < ARM_VM_DIR_ENTRIES); + + /* Page table has to be there. */ + assert(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT); + + /* We do not expect it to be a bigpage. */ + assert(!(pt->pt_dir[pde] & ARM_VM_BIGPAGE)); + + /* Make sure page directory entry for this page table + * is marked present and page table entry is available. + */ + assert(pt->pt_pt[pde]); + +#if SANITYCHECKS + /* We don't expect to overwrite a page. */ + if(!(writemapflags & (WMF_OVERWRITE|WMF_VERIFY))) + assert(!(pt->pt_pt[pde][pte] & ARM_VM_PTE_PRESENT)); +#endif + if(writemapflags & (WMF_WRITEFLAGSONLY|WMF_FREE)) { + physaddr = pt->pt_pt[pde][pte] & ARM_VM_PTE_MASK; + } + + if(writemapflags & WMF_FREE) { + free_mem(ABS2CLICK(physaddr), 1); + } + + /* Entry we will write. */ + entry = (physaddr & ARM_VM_PTE_MASK) | flags; + + if(verify) { + u32_t maskedentry; + maskedentry = pt->pt_pt[pde][pte]; + /* Verify pagetable entry. */ + if(entry & ARM_VM_PTE_RW) { + /* If we expect a writable page, allow a readonly page. */ + maskedentry |= ARM_VM_PTE_RW; + } + if(maskedentry != entry) { + printf("pt_writemap: mismatch: "); + if((entry & ARM_VM_PTE_MASK) != + (maskedentry & ARM_VM_PTE_MASK)) { + printf("pt_writemap: physaddr mismatch (0x%lx, 0x%lx); ", + (long)entry, (long)maskedentry); + } else printf("phys ok; "); + printf(" flags: found %s; ", + ptestr(pt->pt_pt[pde][pte])); + printf(" masked %s; ", + ptestr(maskedentry)); + printf(" expected %s\n", ptestr(entry)); + ret = EFAULT; + goto resume_exit; + } + } else { + /* Write pagetable entry. */ + pt->pt_pt[pde][pte] = entry; + } + + physaddr += ARM_PAGE_SIZE; + v += ARM_PAGE_SIZE; + } + +resume_exit: + +#ifdef CONFIG_SMP + if (vminhibit_clear) { + assert(vmp && vmp->vm_endpoint != NONE && vmp->vm_endpoint != VM_PROC_NR && + !(vmp->vm_flags & VMF_EXITING)); + sys_vmctl(vmp->vm_endpoint, VMCTL_VMINHIBIT_CLEAR, 0); + } +#endif + + return ret; +} + +/*===========================================================================* + * pt_checkrange * + *===========================================================================*/ +int pt_checkrange(pt_t *pt, vir_bytes v, size_t bytes, + int write) +{ + int p, pages; + + assert(!(bytes % ARM_PAGE_SIZE)); + + pages = bytes / ARM_PAGE_SIZE; + + for(p = 0; p < pages; p++) { + int pde = ARM_VM_PDE(v); + int pte = ARM_VM_PTE(v); + + assert(!(v % ARM_PAGE_SIZE)); + assert(pte >= 0 && pte < ARM_VM_PT_ENTRIES); + assert(pde >= 0 && pde < ARM_VM_DIR_ENTRIES); + + /* Page table has to be there. */ + if(!(pt->pt_dir[pde] & ARM_VM_PDE_PRESENT)) + return EFAULT; + + /* Make sure page directory entry for this page table + * is marked present and page table entry is available. + */ + assert((pt->pt_dir[pde] & ARM_VM_PDE_PRESENT) && pt->pt_pt[pde]); + + if(!(pt->pt_pt[pde][pte] & ARM_VM_PTE_PRESENT)) { + return EFAULT; + } + + if(write && (pt->pt_pt[pde][pte] & ARM_VM_PTE_RO)) { + return EFAULT; + } + + v += ARM_PAGE_SIZE; + } + + return OK; +} + +/*===========================================================================* + * pt_new * + *===========================================================================*/ +int pt_new(pt_t *pt) +{ +/* Allocate a pagetable root. On ARM, allocate a page-aligned page directory + * and set them to 0 (indicating no page tables are allocated). Lookup + * its physical address as we'll need that in the future. Verify it's + * page-aligned. + */ + int i; + + /* Don't ever re-allocate/re-move a certain process slot's + * page directory once it's been created. This is a fraction + * faster, but also avoids having to invalidate the page + * mappings from in-kernel page tables pointing to + * the page directories (the page_directories data). + */ + if(!pt->pt_dir && + !(pt->pt_dir = vm_allocpage((phys_bytes *)&pt->pt_dir_phys, VMP_PAGEDIR))) { + return ENOMEM; + } + assert(!((u32_t)pt->pt_dir_phys % ARM_PAGEDIR_SIZE)); + + for(i = 0; i < ARM_VM_DIR_ENTRIES; i++) { + pt->pt_dir[i] = 0; /* invalid entry (ARM_VM_PRESENT bit = 0) */ + pt->pt_pt[i] = NULL; + } + + /* Where to start looking for free virtual address space? */ + pt->pt_virtop = 0; + + /* Map in kernel. */ + if(pt_mapkernel(pt) != OK) + panic("pt_new: pt_mapkernel failed"); + + return OK; +} + +static int freepde(void) +{ + int p = kernel_boot_info.freepde_start++; + assert(kernel_boot_info.freepde_start < ARM_VM_DIR_ENTRIES); + return p; +} + +/*===========================================================================* + * pt_init * + *===========================================================================*/ +void pt_init(void) +{ + pt_t *newpt; + int s, r, p; + vir_bytes sparepages_mem; + vir_bytes sparepagedirs_mem; + static u32_t currentpagedir[ARM_VM_DIR_ENTRIES]; + int m = kernel_boot_info.kern_mod; + u32_t myttbr; + + /* Find what the physical location of the kernel is. */ + assert(m >= 0); + assert(m < kernel_boot_info.mods_with_kernel); + assert(kernel_boot_info.mods_with_kernel < MULTIBOOT_MAX_MODS); + kern_mb_mod = &kernel_boot_info.module_list[m]; + kern_size = kern_mb_mod->mod_end - kern_mb_mod->mod_start; + assert(!(kern_mb_mod->mod_start % ARM_BIG_PAGE_SIZE)); + assert(!(kernel_boot_info.vir_kern_start % ARM_BIG_PAGE_SIZE)); + kern_start_pde = kernel_boot_info.vir_kern_start / ARM_BIG_PAGE_SIZE; + + /* Get ourselves spare pages. */ + sparepages_mem = (vir_bytes) static_sparepages; + assert(!(sparepages_mem % ARM_PAGE_SIZE)); + + /* Get ourselves spare pagedirs. */ + sparepagedirs_mem = (vir_bytes) static_sparepagedirs; + assert(!(sparepagedirs_mem % ARM_PAGEDIR_SIZE)); + + /* Spare pages are used to allocate memory before VM has its own page + * table that things (i.e. arbitrary physical memory) can be mapped into. + * We get it by pre-allocating it in our bss (allocated and mapped in by + * the kernel) in static_sparepages. We also need the physical addresses + * though; we look them up now so they are ready for use. + */ + missing_sparedirs = 0; + assert(STATIC_SPAREPAGEDIRS < SPAREPAGEDIRS); + for(s = 0; s < SPAREPAGEDIRS; s++) { + vir_bytes v = (sparepagedirs_mem + s*ARM_PAGEDIR_SIZE);; + phys_bytes ph; + if((r=sys_umap(SELF, VM_D, (vir_bytes) v, + ARM_PAGEDIR_SIZE, &ph)) != OK) + panic("pt_init: sys_umap failed: %d", r); + if(s >= STATIC_SPAREPAGEDIRS) { + sparepagedirs[s].pagedir = NULL; + missing_sparedirs++; + continue; + } + sparepagedirs[s].pagedir = (void *) v; + sparepagedirs[s].phys = ph; + } + + missing_spares = 0; + assert(STATIC_SPAREPAGES < SPAREPAGES); + for(s = 0; s < SPAREPAGES; s++) { + vir_bytes v = (sparepages_mem + s*ARM_PAGE_SIZE);; + phys_bytes ph; + if((r=sys_umap(SELF, VM_D, (vir_bytes) v, + ARM_PAGE_SIZE*SPAREPAGES, &ph)) != OK) + panic("pt_init: sys_umap failed: %d", r); + if(s >= STATIC_SPAREPAGES) { + sparepages[s].page = NULL; + missing_spares++; + continue; + } + sparepages[s].page = (void *) v; + sparepages[s].phys = ph; + } + + /* 1MB pages available? */ + bigpage_ok = 1; + + /* Allocate us a page table in which to remember page directory + * pointers. + */ + if(!(page_directories = vm_allocpage(&page_directories_phys, + VMP_PAGETABLE))) + panic("no virt addr for vm mappings"); + + memset(page_directories, 0, ARM_PAGE_SIZE); + + /* Now reserve another pde for kernel's own mappings. */ + { + int kernmap_pde; + phys_bytes addr, len; + int flags, index = 0; + u32_t offset = 0; + + kernmap_pde = freepde(); + offset = kernmap_pde * ARM_BIG_PAGE_SIZE; + + while(sys_vmctl_get_mapping(index, &addr, &len, + &flags) == OK) { + vir_bytes vir; + if(index >= MAX_KERNMAPPINGS) + panic("VM: too many kernel mappings: %d", index); + kern_mappings[index].phys_addr = addr; + kern_mappings[index].len = len; + kern_mappings[index].flags = flags; + kern_mappings[index].vir_addr = addr; + kern_mappings[index].flags = + ARM_VM_PTE_PRESENT; + if(flags & VMMF_UNCACHED) + kern_mappings[index].flags |= ARM_VM_PTE_DEVICE; + else + kern_mappings[index].flags |= + ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE; + if(flags & VMMF_USER) + kern_mappings[index].flags |= ARM_VM_PTE_USER; + else + kern_mappings[index].flags |= ARM_VM_PTE_SUPER; + if(flags & VMMF_WRITE) + kern_mappings[index].flags |= ARM_VM_PTE_RW; + else + kern_mappings[index].flags |= ARM_VM_PTE_RO; + if(addr % ARM_PAGE_SIZE) + panic("VM: addr unaligned: %d", addr); + if(len % ARM_PAGE_SIZE) + panic("VM: len unaligned: %d", len); + vir = offset; + if(sys_vmctl_reply_mapping(index, vir) != OK) + panic("VM: reply failed"); + offset += len; + index++; + kernmappings++; + } + } + + /* Find a PDE below processes available for mapping in the + * page directories. + */ + pagedir_pde = freepde(); + pagedir_pde_val = (page_directories_phys & ARM_VM_PDE_MASK) | + ARM_VM_PDE_PRESENT | ARM_VM_PDE_DOMAIN; + + /* Allright. Now. We have to make our own page directory and page tables, + * that the kernel has already set up, accessible to us. It's easier to + * understand if we just copy all the required pages (i.e. page directory + * and page tables), and set up the pointers as if VM had done it itself. + * + * This allocation will happen without using any page table, and just + * uses spare pages. + */ + newpt = &vmprocess->vm_pt; + if(pt_new(newpt) != OK) + panic("vm pt_new failed"); + + /* Get our current pagedir so we can see it. */ + if(sys_vmctl_get_pdbr(SELF, &myttbr) != OK) + panic("VM: sys_vmctl_get_pdbr failed"); + if(sys_vircopy(NONE, myttbr, SELF, + (vir_bytes) currentpagedir, ARM_PAGEDIR_SIZE) != OK) + panic("VM: sys_vircopy failed"); + + /* We have mapped in kernel ourselves; now copy mappings for VM + * that kernel made, including allocations for BSS. Skip identity + * mapping bits; just map in VM. + */ + for(p = 0; p < ARM_VM_DIR_ENTRIES; p++) { + u32_t entry = currentpagedir[p]; + phys_bytes ptaddr_kern, ptaddr_us; + + /* BIGPAGEs are kernel mapping (do ourselves) or boot + * identity mapping (don't want). + */ + if(!(entry & ARM_VM_PDE_PRESENT)) continue; + if((entry & ARM_VM_BIGPAGE)) continue; + + if(pt_ptalloc(newpt, p, 0) != OK) + panic("pt_ptalloc failed"); + assert(newpt->pt_dir[p] & ARM_VM_PDE_PRESENT); + + ptaddr_kern = entry & ARM_VM_PDE_MASK; + ptaddr_us = newpt->pt_dir[p] & ARM_VM_PDE_MASK; + + /* Copy kernel-initialized pagetable contents into our + * normally accessible pagetable. + */ + if(sys_abscopy(ptaddr_kern, ptaddr_us, ARM_PAGETABLE_SIZE) != OK) + panic("pt_init: abscopy failed"); + } + + /* Inform kernel vm has a newly built page table. */ + assert(vmproc[VM_PROC_NR].vm_endpoint == VM_PROC_NR); + pt_bind(newpt, &vmproc[VM_PROC_NR]); + + pt_init_done = 1; + + /* All OK. */ + return; +} + +/*===========================================================================* + * pt_bind * + *===========================================================================*/ +int pt_bind(pt_t *pt, struct vmproc *who) +{ + int slot; + u32_t phys; + void *pdes; + int i; + int pages_per_pagedir = ARM_PAGEDIR_SIZE/ARM_PAGE_SIZE; + + /* Basic sanity checks. */ + assert(who); + assert(who->vm_flags & VMF_INUSE); + assert(pt); + + assert(pagedir_pde >= 0); + + slot = who->vm_slot; + assert(slot >= 0); + assert(slot < ELEMENTS(vmproc)); + assert(slot < ARM_VM_PT_ENTRIES / pages_per_pagedir); + + phys = pt->pt_dir_phys & ARM_VM_PTE_MASK; + assert(pt->pt_dir_phys == phys); + assert(!(pt->pt_dir_phys % ARM_PAGEDIR_SIZE)); + + /* Update "page directory pagetable." */ + for (i = 0; i < pages_per_pagedir; i++) + page_directories[slot*pages_per_pagedir+i] = + (phys+i*ARM_PAGE_SIZE) | + ARM_VM_PTE_PRESENT | ARM_VM_PTE_RW | + ARM_VM_PTE_USER; + + /* This is where the PDE's will be visible to the kernel + * in its address space. + */ + pdes = (void *) (pagedir_pde*ARM_BIG_PAGE_SIZE + + slot * ARM_PAGEDIR_SIZE); + +#if 0 + printf("VM: slot %d endpoint %d has pde val 0x%lx at kernel address 0x%lx\n", + slot, who->vm_endpoint, page_directories[slot], pdes); +#endif + /* Tell kernel about new page table root. */ + return sys_vmctl_set_addrspace(who->vm_endpoint, pt->pt_dir_phys, pdes); +} + +/*===========================================================================* + * pt_free * + *===========================================================================*/ +void pt_free(pt_t *pt) +{ +/* Free memory associated with this pagetable. */ + int i; + + for(i = 0; i < ARM_VM_DIR_ENTRIES; i++) + if(pt->pt_pt[i]) + vm_freepages((vir_bytes) pt->pt_pt[i], 1); + + return; +} + +/*===========================================================================* + * pt_mapkernel * + *===========================================================================*/ +int pt_mapkernel(pt_t *pt) +{ + int i; + int kern_pde = kern_start_pde; + phys_bytes addr, mapped = 0; + + /* Any ARM page table needs to map in the kernel address space. */ + assert(bigpage_ok); + assert(pagedir_pde >= 0); + assert(kern_pde >= 0); + + /* pt_init() has made sure this is ok. */ + addr = kern_mb_mod->mod_start; + + /* Actually mapping in kernel */ + while(mapped < kern_size) { + pt->pt_dir[kern_pde] = (addr & ARM_VM_PDE_MASK) | + ARM_VM_SECTION | + ARM_VM_SECTION_DOMAIN | ARM_VM_SECTION_WB | + ARM_VM_SECTION_SHAREABLE | ARM_VM_SECTION_SUPER; + kern_pde++; + mapped += ARM_BIG_PAGE_SIZE; + addr += ARM_BIG_PAGE_SIZE; + } + + /* Kernel also wants to know about all page directories. */ + assert(pagedir_pde > kern_pde); + pt->pt_dir[pagedir_pde] = pagedir_pde_val; + + /* Kernel also wants various mappings of its own. */ + for(i = 0; i < kernmappings; i++) { + if(pt_writemap(NULL, pt, + kern_mappings[i].vir_addr, + kern_mappings[i].phys_addr, + kern_mappings[i].len, + kern_mappings[i].flags, 0) != OK) { + panic("pt_mapkernel: pt_writemap failed"); + } + } + + return OK; +} + +/*===========================================================================* + * pt_cycle * + *===========================================================================*/ +void pt_cycle(void) +{ + vm_checkspares(); + vm_checksparedirs(); +} + +int get_vm_self_pages(void) { return vm_self_pages; } diff --git a/servers/vm/arch/arm/pagetable.h b/servers/vm/arch/arm/pagetable.h new file mode 100644 index 000000000..f78be1578 --- /dev/null +++ b/servers/vm/arch/arm/pagetable.h @@ -0,0 +1,51 @@ + +#ifndef _PAGETABLE_H +#define _PAGETABLE_H 1 + +#include +#include + +#include "vm.h" + +/* An ARM pagetable. */ +typedef struct { + /* Directory entries in VM addr space - root of page table. */ + u32_t *pt_dir; /* 16KB aligned (ARM_VM_DIR_ENTRIES) */ + u32_t pt_dir_phys; /* physical address of pt_dir */ + + /* Pointers to page tables in VM address space. */ + u32_t *pt_pt[ARM_VM_DIR_ENTRIES]; + + /* When looking for a hole in virtual address space, start + * looking here. This is in linear addresses, i.e., + * not as the process sees it but the position in the page + * page table. This is just a hint. + */ + u32_t pt_virtop; +} pt_t; + +/* Mapping flags. */ +#define PTF_WRITE ARM_VM_PTE_RW +#define PTF_READ ARM_VM_PTE_RO +#define PTF_PRESENT ARM_VM_PTE_PRESENT +#define PTF_SUPER ARM_VM_PTE_SUPER +#define PTF_USER ARM_VM_PTE_USER +#define PTF_NOCACHE ARM_VM_PTE_DEVICE +#define PTF_CACHEWB ARM_VM_PTE_WB +#define PTF_CACHEWT ARM_VM_PTE_WT +#define PTF_SHARE ARM_VM_PTE_SHAREABLE + +/* For arch-specific PT routines to check if no bits outside + * the regular flags are set. + */ +#define PTF_ALLFLAGS (PTF_READ|PTF_WRITE|PTF_PRESENT|PTF_SUPER|PTF_USER|PTF_NOCACHE|PTF_CACHEWB|PTF_CACHEWT|PTF_SHARE) + +#if SANITYCHECKS +#define PT_SANE(p) { pt_sanitycheck((p), __FILE__, __LINE__); } +#else +#define PT_SANE(p) +#endif + +#endif + + diff --git a/servers/vm/proto.h b/servers/vm/proto.h index 2824d84e2..19917f7dd 100644 --- a/servers/vm/proto.h +++ b/servers/vm/proto.h @@ -96,6 +96,7 @@ int pt_writemap(struct vmproc * vmp, pt_t *pt, vir_bytes v, phys_bytes int pt_checkrange(pt_t *pt, vir_bytes v, size_t bytes, int write); int pt_bind(pt_t *pt, struct vmproc *who); void *vm_allocpage(phys_bytes *p, int cat); +void *vm_allocpagedir(phys_bytes *p); void pt_cycle(void); int pt_mapkernel(pt_t *pt); void vm_pagelock(void *vir, int lockflag);