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