From: Ben Gras Date: Wed, 30 May 2012 23:25:31 +0000 (+0200) Subject: kernel: compact utility functions X-Git-Tag: v3.2.1~549 X-Git-Url: http://zhaoyanbai.com/repos/man.dnssec-keyfromlabel.html?a=commitdiff_plain;h=1daf36038cf1debd282fd70c17802892fc79521c;p=minix.git kernel: compact utility functions --- diff --git a/kernel/arch/i386/klib.S b/kernel/arch/i386/klib.S index 55bf9b2c9..20ea88306 100644 --- a/kernel/arch/i386/klib.S +++ b/kernel/arch/i386/klib.S @@ -11,6 +11,53 @@ #include "sconst.h" #include + +/* Easy way to make functions */ + +/* Make a function of the form func(arg) */ + +#define STACKARG 8(%ebp) + +#define ARG_EAX_ACTION(FUNCTION, ACTION) ;\ +ENTRY(FUNCTION) ;\ + push %ebp ;\ + mov %esp, %ebp ;\ + mov STACKARG, %eax ;\ + ACTION ;\ + pop %ebp ;\ + ret + +/* Make a function of the form ret = func() */ +#define ARG_EAX_RETURN(FUNCTION, EXPR) ;\ +ENTRY(FUNCTION) ;\ + push %ebp ;\ + mov %esp, %ebp ;\ + mov EXPR, %eax ;\ + pop %ebp ;\ + ret + +/* Make a function of the form ret = func() */ +#define ARG_EAX_SET(FUNCTION, DEST) ;\ +ENTRY(FUNCTION) ;\ + push %ebp ;\ + mov %esp, %ebp ;\ + mov STACKARG, %eax ;\ + mov %eax, DEST ;\ + jmp 0f /* a jump is required for some sets */ ;\ +0: pop %ebp ;\ + ret + +/* Make a function of the form ret = func() */ +#define ARG_AX_SET(FUNCTION, DEST) ;\ +ENTRY(FUNCTION) ;\ + push %ebp ;\ + mov %esp, %ebp ;\ + mov STACKARG, %eax ;\ + mov %ax, DEST ;\ + jmp 0f /* a jump is required for some sets */ ;\ +0: pop %ebp ;\ + ret + /* * This file contains a number of assembly code utility routines needed by the * kernel. @@ -450,33 +497,6 @@ ENTRY(fnstsw) fnstsw %ax ret -/* store control word (non-waiting) */ -ENTRY(fnstcw) - push %eax - mov 8(%esp), %eax - - /* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */ - fnstcw (%eax) - pop %eax - ret - -/*===========================================================================*/ -/* fxsave */ -/*===========================================================================*/ -ENTRY(fxsave) - mov 4(%esp), %eax - fxsave (%eax) /* Do not change the operand! (gas2ack) */ - ret - -/*===========================================================================*/ -/* fnsave */ -/*===========================================================================*/ -ENTRY(fnsave) - mov 4(%esp), %eax - fnsave (%eax) /* Do not change the operand! (gas2ack) */ - fwait /* required for compatibility with processors prior pentium */ - ret - /*===========================================================================*/ /* fxrstor */ /*===========================================================================*/ @@ -502,107 +522,37 @@ ENTRY(__frstor_failure) mov $1, %eax ret -/*===========================================================================*/ -/* read_cr0 */ -/*===========================================================================*/ -/* PUBLIC unsigned long read_cr0(void); */ -ENTRY(read_cr0) - push %ebp - mov %esp, %ebp - mov %cr0, %eax - pop %ebp - ret - -/*===========================================================================*/ -/* write_cr0 */ -/*===========================================================================*/ -/* PUBLIC void write_cr0(unsigned long value); */ -ENTRY(write_cr0) - push %ebp - mov %esp, %ebp - mov 8(%ebp), %eax - mov %eax, %cr0 - jmp 0f /* A jump is required for some flags */ -0: - pop %ebp - ret - -/*===========================================================================*/ -/* read_cr2 */ -/*===========================================================================*/ -/* PUBLIC reg_t read_cr2(void); */ -ENTRY(read_cr2) - mov %cr2, %eax - ret - -/*===========================================================================*/ -/* read_cr3 */ -/*===========================================================================*/ -/* PUBLIC unsigned long read_cr3(void); */ -ENTRY(read_cr3) - push %ebp - mov %esp, %ebp - - /* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */ - mov %cr3, %eax - pop %ebp - ret - -/*===========================================================================*/ -/* read_cr4 */ -/*===========================================================================*/ -/* PUBLIC unsigned long read_cr4(void); */ -ENTRY(read_cr4) - push %ebp - mov %esp, %ebp - - /* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */ - mov %cr4, %eax - pop %ebp - ret - -/*===========================================================================*/ -/* write_cr4 */ -/*===========================================================================*/ -/* PUBLIC void write_cr4(unsigned long value); */ -ENTRY(write_cr4) - push %ebp - mov %esp, %ebp - mov 8(%ebp), %eax - - /* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */ - mov %eax, %cr4 - jmp 0f -0: - pop %ebp - ret - -/*===========================================================================*/ -/* write_cr3 */ -/*===========================================================================*/ -/* PUBLIC void write_cr3(unsigned long value); */ -ENTRY(write_cr3) - push %ebp - mov %esp, %ebp - mov 8(%ebp), %eax - - /* DO NOT CHANGE THE OPERAND!!! gas2ack does not handle it yet */ - mov %eax, %cr3 - - pop %ebp - ret - -/*===========================================================================*/ -/* i386_invlpg */ -/*===========================================================================*/ -/* PUBLIC void i386_invlpg(unsigned long linaddr); */ -ENTRY(i386_invlpg) - push %ebp - mov %esp, %ebp - mov 8(%ebp), %eax - invlpg (%eax) - pop %ebp - ret +/* Read/write control registers */ +ARG_EAX_RETURN(read_cr0, %cr0); +ARG_EAX_RETURN(read_cr2, %cr2); +ARG_EAX_RETURN(read_cr3, %cr3); +ARG_EAX_RETURN(read_cr4, %cr4); +ARG_EAX_SET(write_cr4, %cr4); +ARG_EAX_SET(write_cr0, %cr0); +ARG_EAX_SET(write_cr3, %cr3); + +/* Read/write various descriptor tables */ +ARG_EAX_ACTION(x86_ltr, ltr STACKARG ); +ARG_EAX_ACTION(x86_lidt, lidtl (%eax)); +ARG_EAX_ACTION(x86_lgdt, lgdt (%eax)); +ARG_EAX_ACTION(x86_lldt, lldt STACKARG); +ARG_EAX_ACTION(x86_sgdt, sgdt (%eax)); +ARG_EAX_ACTION(x86_sidt, sidt (%eax)); + +/* Load segments */ +ARG_AX_SET(x86_load_ds, %ds) +ARG_AX_SET(x86_load_es, %es) +ARG_AX_SET(x86_load_fs, %fs) +ARG_AX_SET(x86_load_gs, %gs) +ARG_AX_SET(x86_load_ss, %ss) + +/* FPU */ +ARG_EAX_ACTION(fnsave, fnsave (%eax) ; fwait); +ARG_EAX_ACTION(fxsave, fxsave (%eax)); +ARG_EAX_ACTION(fnstcw, fnstcw (%eax)); + +/* invlpg */ +ARG_EAX_ACTION(i386_invlpg, invlpg (%eax)); /*===========================================================================*/ /* getcr3val */