1 /* 2 * Copyright 2008-2010, Ingo Weinhold, ingo_weinhold@gmx.de. 3 * Copyright 2002-2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved. 4 * Distributed under the terms of the MIT License. 5 * 6 * Copyright 2001-2002, Travis Geiselbrecht. All rights reserved. 7 * Distributed under the terms of the NewOS License. 8 */ 9 10 11 #include <arch/vm_translation_map.h> 12 13 #include <boot/kernel_args.h> 14 15 #ifdef __x86_64__ 16 # include "paging/64bit/X86PagingMethod64Bit.h" 17 #else 18 # include "paging/32bit/X86PagingMethod32Bit.h" 19 # include "paging/pae/X86PagingMethodPAE.h" 20 #endif 21 22 23 //#define TRACE_VM_TMAP 24 #ifdef TRACE_VM_TMAP 25 # define TRACE(x...) dprintf(x) 26 #else 27 # define TRACE(x...) ; 28 #endif 29 30 31 static union { 32 uint64 align; 33 #ifdef __x86_64__ 34 char sixty_four[sizeof(X86PagingMethod64Bit)]; 35 #else 36 char thirty_two[sizeof(X86PagingMethod32Bit)]; 37 #if B_HAIKU_PHYSICAL_BITS == 64 38 char pae[sizeof(X86PagingMethodPAE)]; 39 #endif 40 #endif 41 } sPagingMethodBuffer; 42 43 44 // #pragma mark - VM API 45 46 47 status_t 48 arch_vm_translation_map_create_map(bool kernel, VMTranslationMap** _map) 49 { 50 return gX86PagingMethod->CreateTranslationMap(kernel, _map); 51 } 52 53 54 status_t 55 arch_vm_translation_map_init(kernel_args *args, 56 VMPhysicalPageMapper** _physicalPageMapper) 57 { 58 TRACE("vm_translation_map_init: entry\n"); 59 60 #ifdef TRACE_VM_TMAP 61 TRACE("physical memory ranges:\n"); 62 for (uint32 i = 0; i < args->num_physical_memory_ranges; i++) { 63 phys_addr_t start = args->physical_memory_range[i].start; 64 phys_addr_t end = start + args->physical_memory_range[i].size; 65 TRACE(" %#10" B_PRIxPHYSADDR " - %#10" B_PRIxPHYSADDR "\n", start, 66 end); 67 } 68 69 TRACE("allocated physical ranges:\n"); 70 for (uint32 i = 0; i < args->num_physical_allocated_ranges; i++) { 71 phys_addr_t start = args->physical_allocated_range[i].start; 72 phys_addr_t end = start + args->physical_allocated_range[i].size; 73 TRACE(" %#10" B_PRIxPHYSADDR " - %#10" B_PRIxPHYSADDR "\n", start, 74 end); 75 } 76 77 TRACE("allocated virtual ranges:\n"); 78 for (uint32 i = 0; i < args->num_virtual_allocated_ranges; i++) { 79 addr_t start = args->virtual_allocated_range[i].start; 80 addr_t end = start + args->virtual_allocated_range[i].size; 81 TRACE(" %#10" B_PRIxADDR " - %#10" B_PRIxADDR "\n", start, end); 82 } 83 #endif 84 85 #ifdef __x86_64__ 86 gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod64Bit; 87 #elif B_HAIKU_PHYSICAL_BITS == 64 88 bool paeAvailable = x86_check_feature(IA32_FEATURE_PAE, FEATURE_COMMON); 89 bool paeNeeded = false; 90 for (uint32 i = 0; i < args->num_physical_memory_ranges; i++) { 91 phys_addr_t end = args->physical_memory_range[i].start 92 + args->physical_memory_range[i].size; 93 if (end > 0x100000000LL) { 94 paeNeeded = true; 95 break; 96 } 97 } 98 99 if (paeAvailable && paeNeeded) { 100 dprintf("using PAE paging\n"); 101 gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethodPAE; 102 } else { 103 dprintf("using 32 bit paging (PAE not %s)\n", 104 paeNeeded ? "available" : "needed"); 105 gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit; 106 } 107 #else 108 gX86PagingMethod = new(&sPagingMethodBuffer) X86PagingMethod32Bit; 109 #endif 110 111 return gX86PagingMethod->Init(args, _physicalPageMapper); 112 } 113 114 115 status_t 116 arch_vm_translation_map_init_post_sem(kernel_args *args) 117 { 118 return B_OK; 119 } 120 121 122 status_t 123 arch_vm_translation_map_init_post_area(kernel_args *args) 124 { 125 TRACE("vm_translation_map_init_post_area: entry\n"); 126 127 return gX86PagingMethod->InitPostArea(args); 128 } 129 130 131 status_t 132 arch_vm_translation_map_early_map(kernel_args *args, addr_t va, phys_addr_t pa, 133 uint8 attributes, phys_addr_t (*get_free_page)(kernel_args *)) 134 { 135 TRACE("early_tmap: entry pa 0x%lx va 0x%lx\n", pa, va); 136 137 return gX86PagingMethod->MapEarly(args, va, pa, attributes, get_free_page); 138 } 139 140 141 /*! Verifies that the page at the given virtual address can be accessed in the 142 current context. 143 144 This function is invoked in the kernel debugger. Paranoid checking is in 145 order. 146 147 \param virtualAddress The virtual address to be checked. 148 \param protection The area protection for which to check. Valid is a bitwise 149 or of one or more of \c B_KERNEL_READ_AREA or \c B_KERNEL_WRITE_AREA. 150 \return \c true, if the address can be accessed in all ways specified by 151 \a protection, \c false otherwise. 152 */ 153 bool 154 arch_vm_translation_map_is_kernel_page_accessible(addr_t virtualAddress, 155 uint32 protection) 156 { 157 if (!gX86PagingMethod) 158 return true; 159 160 return gX86PagingMethod->IsKernelPageAccessible(virtualAddress, protection); 161 } 162