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 USUFFIX q
  25 #define DATA_TYPE uint64_t
  26 #elif DATA_SIZE == 4
  27 #define SUFFIX l
  28 #define USUFFIX l
  29 #define DATA_TYPE uint32_t
  30 #elif DATA_SIZE == 2
  31 #define SUFFIX w
  32 #define USUFFIX uw
  33 #define DATA_TYPE uint16_t
  34 #elif DATA_SIZE == 1
  35 #define SUFFIX b
  36 #define USUFFIX ub
  37 #define DATA_TYPE uint8_t
  38 #else
  39 #error unsupported data size
  40 #endif
  41
  42 static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
  43                                                         int is_user,
  44                                                         void *retaddr);
  45 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
  46                                                    DATA_TYPE val,
  47                                                    int is_user,
  48                                                    void *retaddr);
  49
  50 static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr,
  51                                               unsigned long tlb_addr)
  52 {
  53     DATA_TYPE res;
  54     int index;
  55
  56     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
  57 #if SHIFT <= 2
  58     res = io_mem_read[index][SHIFT](physaddr);
  59 #else
  60 #ifdef TARGET_WORDS_BIGENDIAN
  61     res = (uint64_t)io_mem_read[index][2](physaddr) << 32;
  62     res |= io_mem_read[index][2](physaddr + 4);
  63 #else
  64     res = io_mem_read[index][2](physaddr);
  65     res |= (uint64_t)io_mem_read[index][2](physaddr + 4) << 32;
  66 #endif
  67 #endif /* SHIFT > 2 */
  68     return res;
  69 }
  70
  71 static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
  72                                           DATA_TYPE val,
  73                                           unsigned long tlb_addr)
  74 {
  75     int index;
  76
  77     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
  78 #if SHIFT <= 2
  79     io_mem_write[index][SHIFT](physaddr, val);
  80 #else
  81 #ifdef TARGET_WORDS_BIGENDIAN
  82     io_mem_write[index][2](physaddr, val >> 32);
  83     io_mem_write[index][2](physaddr + 4, val);
  84 #else
  85     io_mem_write[index][2](physaddr, val);
  86     io_mem_write[index][2](physaddr + 4, val >> 32);
  87 #endif
  88 #endif /* SHIFT > 2 */
  89 }
  90
  91 /* handle all cases except unaligned access which span two pages */
  92 DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
  93                                                          int is_user)
  94 {
  95     DATA_TYPE res;
  96     int index;
  97     unsigned long physaddr, tlb_addr;
  98     void *retaddr;
  99
 100     /* test if there is match for unaligned or IO access */
 101     /* XXX: could done more in memory macro in a non portable way */
 102     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 103  redo:
 104     tlb_addr = env->tlb_read[is_user][index].address;
 105     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 106         physaddr = addr + env->tlb_read[is_user][index].addend;
 107         if (tlb_addr & ~TARGET_PAGE_MASK) {
 108             /* IO access */
 109             if ((addr & (DATA_SIZE - 1)) != 0)
 110                 goto do_unaligned_access;
 111             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
 112         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 113             /* slow unaligned access (it spans two pages or IO) */
 114         do_unaligned_access:
 115             retaddr = GETPC();
 116             res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr,
 117                                                          is_user, retaddr);
 118         } else {
 119             /* unaligned access in the same page */
 120             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
 121         }
 122     } else {
 123         /* the page is not in the TLB : fill it */
 124         retaddr = GETPC();
 125         tlb_fill(addr, 0, is_user, retaddr);
 126         goto redo;
 127     }
 128     return res;
 129 }
 130
 131 /* handle all unaligned cases */
 132 static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
 133                                                         int is_user,
 134                                                         void *retaddr)
 135 {
 136     DATA_TYPE res, res1, res2;
 137     int index, shift;
 138     unsigned long physaddr, tlb_addr, addr1, addr2;
 139
 140     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 141  redo:
 142     tlb_addr = env->tlb_read[is_user][index].address;
 143     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 144         physaddr = addr + env->tlb_read[is_user][index].addend;
 145         if (tlb_addr & ~TARGET_PAGE_MASK) {
 146             /* IO access */
 147             if ((addr & (DATA_SIZE - 1)) != 0)
 148                 goto do_unaligned_access;
 149             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
 150         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 151         do_unaligned_access:
 152             /* slow unaligned access (it spans two pages) */
 153             addr1 = addr & ~(DATA_SIZE - 1);
 154             addr2 = addr1 + DATA_SIZE;
 155             res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1,
 156                                                           is_user, retaddr);
 157             res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2,
 158                                                           is_user, retaddr);
 159             shift = (addr & (DATA_SIZE - 1)) * 8;
 160 #ifdef TARGET_WORDS_BIGENDIAN
 161             res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
 162 #else
 163             res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
 164 #endif
 165         } else {
 166             /* unaligned/aligned access in the same page */
 167             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
 168         }
 169     } else {
 170         /* the page is not in the TLB : fill it */
 171         tlb_fill(addr, 0, is_user, retaddr);
 172         goto redo;
 173     }
 174     return res;
 175 }
 176
 177
 178 void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(unsigned long addr,
 179                                                     DATA_TYPE val,
 180                                                     int is_user)
 181 {
 182     unsigned long physaddr, tlb_addr;
 183     void *retaddr;
 184     int index;
 185
 186     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 187  redo:
 188     tlb_addr = env->tlb_write[is_user][index].address;
 189     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 190         physaddr = addr + env->tlb_read[is_user][index].addend;
 191         if (tlb_addr & ~TARGET_PAGE_MASK) {
 192             /* IO access */
 193             if ((addr & (DATA_SIZE - 1)) != 0)
 194                 goto do_unaligned_access;
 195             glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
 196         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 197         do_unaligned_access:
 198             retaddr = GETPC();
 199             glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val,
 200                                                    is_user, retaddr);
 201         } else {
 202             /* aligned/unaligned access in the same page */
 203             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 204         }
 205     } else {
 206         /* the page is not in the TLB : fill it */
 207         retaddr = GETPC();
 208         tlb_fill(addr, 1, is_user, retaddr);
 209         goto redo;
 210     }
 211 }
 212
 213 /* handles all unaligned cases */
 214 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
 215                                                    DATA_TYPE val,
 216                                                    int is_user,
 217                                                    void *retaddr)
 218 {
 219     unsigned long physaddr, tlb_addr;
 220     int index, i;
 221
 222     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 223  redo:
 224     tlb_addr = env->tlb_write[is_user][index].address;
 225     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 226         physaddr = addr + env->tlb_read[is_user][index].addend;
 227         if (tlb_addr & ~TARGET_PAGE_MASK) {
 228             /* IO access */
 229             if ((addr & (DATA_SIZE - 1)) != 0)
 230                 goto do_unaligned_access;
 231             glue(io_write, SUFFIX)(physaddr, val, tlb_addr);
 232         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 233         do_unaligned_access:
 234             /* XXX: not efficient, but simple */
 235             for(i = 0;i < DATA_SIZE; i++) {
 236 #ifdef TARGET_WORDS_BIGENDIAN
 237                 glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)),
 238                                           is_user, retaddr);
 239 #else
 240                 glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8),
 241                                           is_user, retaddr);
 242 #endif
 243             }
 244         } else {
 245             /* aligned/unaligned access in the same page */
 246             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 247         }
 248     } else {
 249         /* the page is not in the TLB : fill it */
 250         tlb_fill(addr, 1, is_user, retaddr);
 251         goto redo;
 252     }
 253 }
 254
 255 #undef SHIFT
 256 #undef DATA_TYPE
 257 #undef SUFFIX
 258 #undef USUFFIX
 259 #undef DATA_SIZE