target-i386/arch_memory_mapping.c

   1 /*
   2  * i386 memory mapping
   3  *
   4  * Copyright Fujitsu, Corp. 2011, 2012
   5  *
   6  * Authors:
   7  *     Wen Congyang <wency@cn.fujitsu.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "cpu.h"
  15 #include "exec/cpu-all.h"
  16 #include "sysemu/memory_mapping.h"
  17
  18 /* PAE Paging or IA-32e Paging */
  19 static void walk_pte(MemoryMappingList *list, AddressSpace *as,
  20                      hwaddr pte_start_addr,
  21                      int32_t a20_mask, target_ulong start_line_addr)
  22 {
  23     hwaddr pte_addr, start_paddr;
  24     uint64_t pte;
  25     target_ulong start_vaddr;
  26     int i;
  27
  28     for (i = 0; i < 512; i++) {
  29         pte_addr = (pte_start_addr + i * 8) & a20_mask;
  30         pte = address_space_ldq(as, pte_addr, MEMTXATTRS_UNSPECIFIED, NULL);
  31         if (!(pte & PG_PRESENT_MASK)) {
  32             /* not present */
  33             continue;
  34         }
  35
  36         start_paddr = (pte & ~0xfff) & ~(0x1ULL << 63);
  37         if (cpu_physical_memory_is_io(start_paddr)) {
  38             /* I/O region */
  39             continue;
  40         }
  41
  42         start_vaddr = start_line_addr | ((i & 0x1ff) << 12);
  43         memory_mapping_list_add_merge_sorted(list, start_paddr,
  44                                              start_vaddr, 1 << 12);
  45     }
  46 }
  47
  48 /* 32-bit Paging */
  49 static void walk_pte2(MemoryMappingList *list, AddressSpace *as,
  50                       hwaddr pte_start_addr, int32_t a20_mask,
  51                       target_ulong start_line_addr)
  52 {
  53     hwaddr pte_addr, start_paddr;
  54     uint32_t pte;
  55     target_ulong start_vaddr;
  56     int i;
  57
  58     for (i = 0; i < 1024; i++) {
  59         pte_addr = (pte_start_addr + i * 4) & a20_mask;
  60         pte = address_space_ldl(as, pte_addr, MEMTXATTRS_UNSPECIFIED, NULL);
  61         if (!(pte & PG_PRESENT_MASK)) {
  62             /* not present */
  63             continue;
  64         }
  65
  66         start_paddr = pte & ~0xfff;
  67         if (cpu_physical_memory_is_io(start_paddr)) {
  68             /* I/O region */
  69             continue;
  70         }
  71
  72         start_vaddr = start_line_addr | ((i & 0x3ff) << 12);
  73         memory_mapping_list_add_merge_sorted(list, start_paddr,
  74                                              start_vaddr, 1 << 12);
  75     }
  76 }
  77
  78 /* PAE Paging or IA-32e Paging */
  79 #define PLM4_ADDR_MASK 0xffffffffff000ULL /* selects bits 51:12 */
  80
  81 static void walk_pde(MemoryMappingList *list, AddressSpace *as,
  82                      hwaddr pde_start_addr,
  83                      int32_t a20_mask, target_ulong start_line_addr)
  84 {
  85     hwaddr pde_addr, pte_start_addr, start_paddr;
  86     uint64_t pde;
  87     target_ulong line_addr, start_vaddr;
  88     int i;
  89
  90     for (i = 0; i < 512; i++) {
  91         pde_addr = (pde_start_addr + i * 8) & a20_mask;
  92         pde = address_space_ldq(as, pde_addr, MEMTXATTRS_UNSPECIFIED, NULL);
  93         if (!(pde & PG_PRESENT_MASK)) {
  94             /* not present */
  95             continue;
  96         }
  97
  98         line_addr = start_line_addr | ((i & 0x1ff) << 21);
  99         if (pde & PG_PSE_MASK) {
 100             /* 2 MB page */
 101             start_paddr = (pde & ~0x1fffff) & ~(0x1ULL << 63);
 102             if (cpu_physical_memory_is_io(start_paddr)) {
 103                 /* I/O region */
 104                 continue;
 105             }
 106             start_vaddr = line_addr;
 107             memory_mapping_list_add_merge_sorted(list, start_paddr,
 108                                                  start_vaddr, 1 << 21);
 109             continue;
 110         }
 111
 112         pte_start_addr = (pde & PLM4_ADDR_MASK) & a20_mask;
 113         walk_pte(list, as, pte_start_addr, a20_mask, line_addr);
 114     }
 115 }
 116
 117 /* 32-bit Paging */
 118 static void walk_pde2(MemoryMappingList *list, AddressSpace *as,
 119                       hwaddr pde_start_addr, int32_t a20_mask,
 120                       bool pse)
 121 {
 122     hwaddr pde_addr, pte_start_addr, start_paddr, high_paddr;
 123     uint32_t pde;
 124     target_ulong line_addr, start_vaddr;
 125     int i;
 126
 127     for (i = 0; i < 1024; i++) {
 128         pde_addr = (pde_start_addr + i * 4) & a20_mask;
 129         pde = address_space_ldl(as, pde_addr, MEMTXATTRS_UNSPECIFIED, NULL);
 130         if (!(pde & PG_PRESENT_MASK)) {
 131             /* not present */
 132             continue;
 133         }
 134
 135         line_addr = (((unsigned int)i & 0x3ff) << 22);
 136         if ((pde & PG_PSE_MASK) && pse) {
 137             /*
 138              * 4 MB page:
 139              * bits 39:32 are bits 20:13 of the PDE
 140              * bit3 31:22 are bits 31:22 of the PDE
 141              */
 142             high_paddr = ((hwaddr)(pde & 0x1fe000) << 19);
 143             start_paddr = (pde & ~0x3fffff) | high_paddr;
 144             if (cpu_physical_memory_is_io(start_paddr)) {
 145                 /* I/O region */
 146                 continue;
 147             }
 148             start_vaddr = line_addr;
 149             memory_mapping_list_add_merge_sorted(list, start_paddr,
 150                                                  start_vaddr, 1 << 22);
 151             continue;
 152         }
 153
 154         pte_start_addr = (pde & ~0xfff) & a20_mask;
 155         walk_pte2(list, as, pte_start_addr, a20_mask, line_addr);
 156     }
 157 }
 158
 159 /* PAE Paging */
 160 static void walk_pdpe2(MemoryMappingList *list, AddressSpace *as,
 161                        hwaddr pdpe_start_addr, int32_t a20_mask)
 162 {
 163     hwaddr pdpe_addr, pde_start_addr;
 164     uint64_t pdpe;
 165     target_ulong line_addr;
 166     int i;
 167
 168     for (i = 0; i < 4; i++) {
 169         pdpe_addr = (pdpe_start_addr + i * 8) & a20_mask;
 170         pdpe = address_space_ldq(as, pdpe_addr, MEMTXATTRS_UNSPECIFIED, NULL);
 171         if (!(pdpe & PG_PRESENT_MASK)) {
 172             /* not present */
 173             continue;
 174         }
 175
 176         line_addr = (((unsigned int)i & 0x3) << 30);
 177         pde_start_addr = (pdpe & ~0xfff) & a20_mask;
 178         walk_pde(list, as, pde_start_addr, a20_mask, line_addr);
 179     }
 180 }
 181
 182 #ifdef TARGET_X86_64
 183 /* IA-32e Paging */
 184 static void walk_pdpe(MemoryMappingList *list, AddressSpace *as,
 185                       hwaddr pdpe_start_addr, int32_t a20_mask,
 186                       target_ulong start_line_addr)
 187 {
 188     hwaddr pdpe_addr, pde_start_addr, start_paddr;
 189     uint64_t pdpe;
 190     target_ulong line_addr, start_vaddr;
 191     int i;
 192
 193     for (i = 0; i < 512; i++) {
 194         pdpe_addr = (pdpe_start_addr + i * 8) & a20_mask;
 195         pdpe = address_space_ldq(as, pdpe_addr, MEMTXATTRS_UNSPECIFIED, NULL);
 196         if (!(pdpe & PG_PRESENT_MASK)) {
 197             /* not present */
 198             continue;
 199         }
 200
 201         line_addr = start_line_addr | ((i & 0x1ffULL) << 30);
 202         if (pdpe & PG_PSE_MASK) {
 203             /* 1 GB page */
 204             start_paddr = (pdpe & ~0x3fffffff) & ~(0x1ULL << 63);
 205             if (cpu_physical_memory_is_io(start_paddr)) {
 206                 /* I/O region */
 207                 continue;
 208             }
 209             start_vaddr = line_addr;
 210             memory_mapping_list_add_merge_sorted(list, start_paddr,
 211                                                  start_vaddr, 1 << 30);
 212             continue;
 213         }
 214
 215         pde_start_addr = (pdpe & PLM4_ADDR_MASK) & a20_mask;
 216         walk_pde(list, as, pde_start_addr, a20_mask, line_addr);
 217     }
 218 }
 219
 220 /* IA-32e Paging */
 221 static void walk_pml4e(MemoryMappingList *list, AddressSpace *as,
 222                        hwaddr pml4e_start_addr, int32_t a20_mask)
 223 {
 224     hwaddr pml4e_addr, pdpe_start_addr;
 225     uint64_t pml4e;
 226     target_ulong line_addr;
 227     int i;
 228
 229     for (i = 0; i < 512; i++) {
 230         pml4e_addr = (pml4e_start_addr + i * 8) & a20_mask;
 231         pml4e = address_space_ldq(as, pml4e_addr, MEMTXATTRS_UNSPECIFIED,
 232                                   NULL);
 233         if (!(pml4e & PG_PRESENT_MASK)) {
 234             /* not present */
 235             continue;
 236         }
 237
 238         line_addr = ((i & 0x1ffULL) << 39) | (0xffffULL << 48);
 239         pdpe_start_addr = (pml4e & PLM4_ADDR_MASK) & a20_mask;
 240         walk_pdpe(list, as, pdpe_start_addr, a20_mask, line_addr);
 241     }
 242 }
 243 #endif
 244
 245 void x86_cpu_get_memory_mapping(CPUState *cs, MemoryMappingList *list,
 246                                 Error **errp)
 247 {
 248     X86CPU *cpu = X86_CPU(cs);
 249     CPUX86State *env = &cpu->env;
 250
 251     if (!cpu_paging_enabled(cs)) {
 252         /* paging is disabled */
 253         return;
 254     }
 255
 256     if (env->cr[4] & CR4_PAE_MASK) {
 257 #ifdef TARGET_X86_64
 258         if (env->hflags & HF_LMA_MASK) {
 259             hwaddr pml4e_addr;
 260
 261             pml4e_addr = (env->cr[3] & PLM4_ADDR_MASK) & env->a20_mask;
 262             walk_pml4e(list, cs->as, pml4e_addr, env->a20_mask);
 263         } else
 264 #endif
 265         {
 266             hwaddr pdpe_addr;
 267
 268             pdpe_addr = (env->cr[3] & ~0x1f) & env->a20_mask;
 269             walk_pdpe2(list, cs->as, pdpe_addr, env->a20_mask);
 270         }
 271     } else {
 272         hwaddr pde_addr;
 273         bool pse;
 274
 275         pde_addr = (env->cr[3] & ~0xfff) & env->a20_mask;
 276         pse = !!(env->cr[4] & CR4_PSE_MASK);
 277         walk_pde2(list, cs->as, pde_addr, env->a20_mask, pse);
 278     }
 279 }
 280