softmmu_template.h

   1 /*
   2  *  Software MMU support
   3  *
   4  *  Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #define DATA_SIZE (1 << SHIFT)
  21
  22 #if DATA_SIZE == 8
  23 #define SUFFIX q
  24 #define DATA_TYPE uint64_t
  25 #elif DATA_SIZE == 4
  26 #define SUFFIX l
  27 #define DATA_TYPE uint32_t
  28 #elif DATA_SIZE == 2
  29 #define SUFFIX w
  30 #define DATA_TYPE uint16_t
  31 #elif DATA_SIZE == 1
  32 #define SUFFIX b
  33 #define DATA_TYPE uint8_t
  34 #else
  35 #error unsupported data size
  36 #endif
  37
  38 static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr);
  39 static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val,
  40                                   void *retaddr);
  41
  42 static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr,
  43                                               unsigned long tlb_addr)
  44 {
  45     DATA_TYPE res;
  46     int index;
  47
  48     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
  49 #if SHIFT <= 2
  50     res = io_mem_read[index][SHIFT](physaddr);
  51 #else
  52 #ifdef TARGET_WORDS_BIGENDIAN
  53     res = (uint64_t)io_mem_read[index][2](physaddr) << 32;
  54     res |= io_mem_read[index][2](physaddr + 4);
  55 #else
  56     res = io_mem_read[index][2](physaddr);
  57     res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32;
  58 #endif
  59 #endif /* SHIFT > 2 */
  60     return res;
  61 }
  62
  63 static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
  64                                           DATA_TYPE val,
  65                                           unsigned long tlb_addr)
  66 {
  67     int index;
  68
  69     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
  70 #if SHIFT <= 2
  71     io_mem_write[index][SHIFT](physaddr, val);
  72 #else
  73 #ifdef TARGET_WORDS_BIGENDIAN
  74     io_mem_write[index][2](physaddr, val >> 32);
  75     io_mem_write[index][2](physaddr + 4, val);
  76 #else
  77     io_mem_write[index][2](physaddr, val);
  78     io_mem_write[index][2](physaddr + 4, val >> 32);
  79 #endif
  80 #endif /* SHIFT > 2 */
  81 }
  82
  83 /* handle all cases except unaligned access which span two pages */
  84 DATA_TYPE __attribute((regparm(1))) glue(glue(__ld, SUFFIX), _mmu)(unsigned long addr)
  85 {
  86     DATA_TYPE res;
  87     int is_user, index;
  88     unsigned long physaddr, tlb_addr;
  89     void *retaddr;
  90
  91     /* test if there is match for unaligned or IO access */
  92     /* XXX: could done more in memory macro in a non portable way */
  93     is_user = (env->cpl == 3);
  94     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
  95  redo:
  96     tlb_addr = env->tlb_read[is_user][index].address;
  97     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
  98         physaddr = addr + env->tlb_read[is_user][index].addend;
  99         if (tlb_addr & ~TARGET_PAGE_MASK) {
 100             /* IO access */
 101             if ((addr & (DATA_SIZE - 1)) != 0)
 102                 goto do_unaligned_access;
 103             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
 104         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 105             /* slow unaligned access (it spans two pages or IO) */
 106         do_unaligned_access:
 107             retaddr = __builtin_return_address(0);
 108             res = glue(slow_ld, SUFFIX)(addr, retaddr);
 109         } else {
 110             /* unaligned access in the same page */
 111             res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
 112         }
 113     } else {
 114         /* the page is not in the TLB : fill it */
 115         retaddr = __builtin_return_address(0);
 116         tlb_fill(addr, 0, retaddr);
 117         goto redo;
 118     }
 119     return res;
 120 }
 121
 122 /* handle all unaligned cases */
 123 static DATA_TYPE glue(slow_ld, SUFFIX)(unsigned long addr, void *retaddr)
 124 {
 125     DATA_TYPE res, res1, res2;
 126     int is_user, index, shift;
 127     unsigned long physaddr, tlb_addr, addr1, addr2;
 128
 129     is_user = (env->cpl == 3);
 130     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 131  redo:
 132     tlb_addr = env->tlb_read[is_user][index].address;
 133     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 134         physaddr = addr + env->tlb_read[is_user][index].addend;
 135         if (tlb_addr & ~TARGET_PAGE_MASK) {
 136             /* IO access */
 137             if ((addr & (DATA_SIZE - 1)) != 0)
 138                 goto do_unaligned_access;
 139             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
 140         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 141         do_unaligned_access:
 142             /* slow unaligned access (it spans two pages) */
 143             addr1 = addr & ~(DATA_SIZE - 1);
 144             addr2 = addr1 + DATA_SIZE;
 145             res1 = glue(slow_ld, SUFFIX)(addr1, retaddr);
 146             res2 = glue(slow_ld, SUFFIX)(addr2, retaddr);
 147             shift = (addr & (DATA_SIZE - 1)) * 8;
 148 #ifdef TARGET_WORDS_BIGENDIAN
 149             res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
 150 #else
 151             res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
 152 #endif
 153         } else {
 154             /* unaligned/aligned access in the same page */
 155             res = glue(glue(ldu, SUFFIX), _raw)((uint8_t *)physaddr);
 156         }
 157     } else {
 158         /* the page is not in the TLB : fill it */
 159         tlb_fill(addr, 0, retaddr);
 160         goto redo;
 161     }
 162     return res;
 163 }
 164
 165
 166 void __attribute((regparm(2))) glue(glue(__st, SUFFIX), _mmu)(unsigned long addr, DATA_TYPE val)
 167 {
 168     unsigned long physaddr, tlb_addr;
 169     void *retaddr;
 170     int is_user, index;
 171
 172     is_user = (env->cpl == 3);
 173     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 174  redo:
 175     tlb_addr = env->tlb_write[is_user][index].address;
 176     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 177         physaddr = addr + env->tlb_read[is_user][index].addend;
 178         if (tlb_addr & ~TARGET_PAGE_MASK) {
 179             /* IO access */
 180             if ((addr & (DATA_SIZE - 1)) != 0)
 181                 goto do_unaligned_access;
 182             glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
 183         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 184         do_unaligned_access:
 185             retaddr = __builtin_return_address(0);
 186             glue(slow_st, SUFFIX)(addr, val, retaddr);
 187         } else {
 188             /* aligned/unaligned access in the same page */
 189             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 190         }
 191     } else {
 192         /* the page is not in the TLB : fill it */
 193         retaddr = __builtin_return_address(0);
 194         tlb_fill(addr, 1, retaddr);
 195         goto redo;
 196     }
 197 }
 198
 199 /* handles all unaligned cases */
 200 static void glue(slow_st, SUFFIX)(unsigned long addr, DATA_TYPE val,
 201                                   void *retaddr)
 202 {
 203     unsigned long physaddr, tlb_addr;
 204     int is_user, index, i;
 205
 206     is_user = (env->cpl == 3);
 207     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 208  redo:
 209     tlb_addr = env->tlb_write[is_user][index].address;
 210     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 211         physaddr = addr + env->tlb_read[is_user][index].addend;
 212         if (tlb_addr & ~TARGET_PAGE_MASK) {
 213             /* IO access */
 214             if ((addr & (DATA_SIZE - 1)) != 0)
 215                 goto do_unaligned_access;
 216             glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
 217         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 218         do_unaligned_access:
 219             /* XXX: not efficient, but simple */
 220             for(i = 0;i < DATA_SIZE; i++) {
 221 #ifdef TARGET_WORDS_BIGENDIAN
 222                 slow_stb(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)), retaddr);
 223 #else
 224                 slow_stb(addr + i, val >> (i * 8), retaddr);
 225 #endif
 226             }
 227         } else {
 228             /* aligned/unaligned access in the same page */
 229             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 230         }
 231     } else {
 232         /* the page is not in the TLB : fill it */
 233         tlb_fill(addr, 1, retaddr);
 234         goto redo;
 235     }
 236 }
 237
 238 #undef SHIFT
 239 #undef DATA_TYPE
 240 #undef SUFFIX
 241 #undef DATA_SIZE