From: Ben Gras Date: Fri, 9 Nov 2012 18:00:46 +0000 (+0100) Subject: vm: reduce noise in merged pagetable.c X-Git-Tag: v3.2.1~232 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/zpipe.c?a=commitdiff_plain;h=6cf98dbe00d10dca91f35136e9739948b11d7a23;p=minix.git vm: reduce noise in merged pagetable.c --- diff --git a/servers/vm/arch/i386/pagetable.c b/servers/vm/arch/i386/pagetable.c index 424b452e4..9ceac7409 100644 --- a/servers/vm/arch/i386/pagetable.c +++ b/servers/vm/arch/i386/pagetable.c @@ -38,23 +38,14 @@ static int vm_self_pages; /* PDE used to map in kernel, kernel physical address. */ static int pagedir_pde = -1; -#if defined(__i386__) static u32_t global_bit = 0, pagedir_pde_val; -#elif defined(__arm__) -static u32_t pagedir_pde_val; -#endif static multiboot_module_t *kern_mb_mod = NULL; static size_t kern_size = 0; static int kern_start_pde = -1; -#if defined(__i386__) -/* 4MB page size available in hardware? */ -static int bigpage_ok = 0; -#elif defined(__arm__) -/* 1MB page size available in hardware? */ +/* big page size available in hardware? */ static int bigpage_ok = 1; -#endif /* Our process table entry. */ struct vmproc *vmprocess = &vmproc[VM_PROC_NR]; @@ -81,8 +72,8 @@ static struct { void *pagedir; phys_bytes phys; } sparepagedirs[SPAREPAGEDIRS]; - #endif + int missing_spares = SPAREPAGES; static struct { void *page; @@ -116,17 +107,13 @@ int kernmappings = 0; phys_bytes page_directories_phys; u32_t *page_directories = NULL; -#if defined(__i386__) static char static_sparepages[VM_PAGE_SIZE*STATIC_SPAREPAGES] __aligned(VM_PAGE_SIZE); -#elif defined(__arm__) -static char static_sparepagedirs[ARCH_PAGEDIR_SIZE*STATIC_SPAREPAGEDIRS + ARCH_PAGEDIR_SIZE] __aligned(ARCH_PAGEDIR_SIZE); -#endif #if defined(__arm__) -static char static_sparepages[VM_PAGE_SIZE*STATIC_SPAREPAGES] __aligned(VM_PAGE_SIZE); - +static char static_sparepagedirs[ARCH_PAGEDIR_SIZE*STATIC_SPAREPAGEDIRS + ARCH_PAGEDIR_SIZE] __aligned(ARCH_PAGEDIR_SIZE); #endif + #if SANITYCHECKS /*===========================================================================* * pt_sanitycheck * @@ -417,11 +404,7 @@ void *vm_allocpage(phys_bytes *phys, int reason) assert(level >= 1); assert(level <= 2); -#if defined(__i386__) if((level > 1) || !pt_init_done) { -#elif defined(__arm__) - if(level > 1 || !pt_init_done) { -#endif void *s; #if defined(__i386__) s=vm_getsparepage(phys); @@ -852,12 +835,12 @@ int pt_ptmap(struct vmproc *src_vmp, struct vmproc *dst_vmp) physaddr = pt->pt_dir[pde] & ARCH_VM_PDE_MASK; #endif if((r=pt_writemap(dst_vmp, &dst_vmp->vm_pt, viraddr, physaddr, VM_PAGE_SIZE, -#if defined(__i386__) - ARCH_VM_PTE_PRESENT | ARCH_VM_PTE_USER | ARCH_VM_PTE_RW, -#elif defined(__arm__) - ARCH_VM_PTE_PRESENT | ARCH_VM_PTE_USER | ARCH_VM_PTE_RW | - ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE, + ARCH_VM_PTE_PRESENT | ARCH_VM_PTE_USER | ARCH_VM_PTE_RW +#ifdef __arm__ + | ARCH_VM_PTE_PRESENT | ARCH_VM_PTE_USER | ARCH_VM_PTE_RW | + ARM_VM_PTE_WB | ARM_VM_PTE_SHAREABLE #endif + , WMF_OVERWRITE)) != OK) { return r; } @@ -1142,9 +1125,7 @@ void pt_init(void) { pt_t *newpt; int s, r, p; -#if defined(__i386__) int global_bit_ok = 0; -#endif vir_bytes sparepages_mem; #if defined(__arm__) vir_bytes sparepagedirs_mem; @@ -1175,8 +1156,8 @@ void pt_init(void) /* Get ourselves spare pagedirs. */ sparepagedirs_mem = (vir_bytes) static_sparepagedirs; assert(!(sparepagedirs_mem % ARCH_PAGEDIR_SIZE)); - #endif + /* 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 @@ -1207,18 +1188,10 @@ void pt_init(void) for(s = 0; s < SPAREPAGES; s++) { vir_bytes v = (sparepages_mem + s*VM_PAGE_SIZE);; phys_bytes ph; -#if defined(__i386__) - if((r=sys_umap(SELF, VM_D, (vir_bytes) v, -#elif defined(__arm__) if((r=sys_umap(SELF, VM_D, (vir_bytes) v, -#endif VM_PAGE_SIZE*SPAREPAGES, &ph)) != OK) panic("pt_init: sys_umap failed: %d", r); -#if defined(__i386__) if(s >= STATIC_SPAREPAGES) { -#elif defined(__arm__) - if(s >= STATIC_SPAREPAGES) { -#endif sparepages[s].page = NULL; missing_spares++; continue; @@ -1231,17 +1204,12 @@ void pt_init(void) /* global bit and 4MB pages available? */ global_bit_ok = _cpufeature(_CPUF_I386_PGE); bigpage_ok = _cpufeature(_CPUF_I386_PSE); -#elif defined(__arm__) - /* 1MB pages available? */ - bigpage_ok = 1; -#endif -#if defined(__i386__) /* Set bit for PTE's and PDE's if available. */ if(global_bit_ok) global_bit = I386_VM_GLOBAL; - #endif + /* Allocate us a page table in which to remember page directory * pointers. */ @@ -1382,11 +1350,7 @@ void pt_init(void) /* Copy kernel-initialized pagetable contents into our * normally accessible pagetable. */ -#if defined(__i386__) if(sys_abscopy(ptaddr_kern, ptaddr_us, VM_PAGE_SIZE) != OK) -#elif defined(__arm__) - if(sys_abscopy(ptaddr_kern, ptaddr_us, ARM_PAGETABLE_SIZE) != OK) -#endif panic("pt_init: abscopy failed"); } @@ -1408,10 +1372,7 @@ int pt_bind(pt_t *pt, struct vmproc *who) int slot; u32_t phys; void *pdes; -#if defined(__arm__) - int i; int pages_per_pagedir = ARCH_PAGEDIR_SIZE/VM_PAGE_SIZE; -#endif /* Basic sanity checks. */ assert(who); @@ -1423,11 +1384,7 @@ int pt_bind(pt_t *pt, struct vmproc *who) slot = who->vm_slot; assert(slot >= 0); assert(slot < ELEMENTS(vmproc)); -#if defined(__i386__) - assert(slot < ARCH_VM_PT_ENTRIES); -#elif defined(__arm__) assert(slot < ARCH_VM_PT_ENTRIES / pages_per_pagedir); -#endif #if defined(__i386__) phys = pt->pt_dir_phys & ARCH_VM_ADDR_MASK; @@ -1435,19 +1392,20 @@ int pt_bind(pt_t *pt, struct vmproc *who) phys = pt->pt_dir_phys & ARM_VM_PTE_MASK; #endif assert(pt->pt_dir_phys == phys); -#if defined(__arm__) assert(!(pt->pt_dir_phys % ARCH_PAGEDIR_SIZE)); -#endif /* Update "page directory pagetable." */ #if defined(__i386__) page_directories[slot] = phys | ARCH_VM_PDE_PRESENT|ARCH_VM_PTE_RW; #elif defined(__arm__) + { + int i; for (i = 0; i < pages_per_pagedir; i++) page_directories[slot*pages_per_pagedir+i] = (phys+i*VM_PAGE_SIZE) | ARCH_VM_PTE_PRESENT | ARCH_VM_PTE_RW | ARCH_VM_PTE_USER; + } #endif /* This is where the PDE's will be visible to the kernel @@ -1492,11 +1450,7 @@ int pt_mapkernel(pt_t *pt) int kern_pde = kern_start_pde; phys_bytes addr, mapped = 0; -#if defined(__i386__) - /* Any i386 page table needs to map in the kernel address space. */ -#elif defined(__arm__) - /* Any ARM page table needs to map in the kernel address space. */ -#endif + /* Any page table needs to map in the kernel address space. */ assert(bigpage_ok); assert(pagedir_pde >= 0); assert(kern_pde >= 0); diff --git a/servers/vm/arch/i386/pagetable.h b/servers/vm/arch/i386/pagetable.h index 69bb1cd1d..251802b78 100644 --- a/servers/vm/arch/i386/pagetable.h +++ b/servers/vm/arch/i386/pagetable.h @@ -25,7 +25,7 @@ #define ARCH_VM_PTE_PRESENT I386_VM_PRESENT #define ARCH_VM_PTE_USER I386_VM_USER #define ARCH_VM_PTE_RW I386_VM_WRITE -#define ARCH_PAGEDIR_SIZE I386_PAGEDIR_SIZE +#define ARCH_PAGEDIR_SIZE I386_PAGE_SIZE #define ARCH_VM_BIGPAGE I386_VM_BIGPAGE #define ARCH_VM_PT_ENTRIES I386_VM_PT_ENTRIES