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 #ifdef SOFTMMU_CODE_ACCESS
  43 #define READ_ACCESS_TYPE 2
  44 #else
  45 #define READ_ACCESS_TYPE 0
  46 #endif
  47
  48 static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
  49                                                         int is_user,
  50                                                         void *retaddr);
  51 static inline DATA_TYPE glue(io_read, SUFFIX)(unsigned long physaddr,
  52                                               unsigned long tlb_addr)
  53 {
  54     DATA_TYPE res;
  55     int index;
  56
  57     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
  58 #if SHIFT <= 2
  59     res = io_mem_read[index][SHIFT](io_mem_opaque[index], physaddr);
  60 #else
  61 #ifdef TARGET_WORDS_BIGENDIAN
  62     res = (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr) << 32;
  63     res |= io_mem_read[index][2](io_mem_opaque[index], physaddr + 4);
  64 #else
  65     res = io_mem_read[index][2](io_mem_opaque[index], physaddr);
  66     res |= (uint64_t)io_mem_read[index][2](io_mem_opaque[index], physaddr + 4) << 32;
  67 #endif
  68 #endif /* SHIFT > 2 */
  69     return res;
  70 }
  71
  72 /* handle all cases except unaligned access which span two pages */
  73 DATA_TYPE REGPARM(1) glue(glue(__ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
  74                                                          int is_user)
  75 {
  76     DATA_TYPE res;
  77     int index;
  78     unsigned long physaddr, tlb_addr;
  79     void *retaddr;
  80
  81     /* test if there is match for unaligned or IO access */
  82     /* XXX: could done more in memory macro in a non portable way */
  83     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
  84  redo:
  85     tlb_addr = env->tlb_read[is_user][index].address;
  86     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
  87         physaddr = addr + env->tlb_read[is_user][index].addend;
  88         if (tlb_addr & ~TARGET_PAGE_MASK) {
  89             /* IO access */
  90             if ((addr & (DATA_SIZE - 1)) != 0)
  91                 goto do_unaligned_access;
  92             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
  93         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
  94             /* slow unaligned access (it spans two pages or IO) */
  95         do_unaligned_access:
  96             retaddr = GETPC();
  97             res = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr,
  98                                                          is_user, retaddr);
  99         } else {
 100             /* unaligned access in the same page */
 101             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
 102         }
 103     } else {
 104         /* the page is not in the TLB : fill it */
 105         retaddr = GETPC();
 106         tlb_fill(addr, READ_ACCESS_TYPE, is_user, retaddr);
 107         goto redo;
 108     }
 109     return res;
 110 }
 111
 112 /* handle all unaligned cases */
 113 static DATA_TYPE glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(unsigned long addr,
 114                                                         int is_user,
 115                                                         void *retaddr)
 116 {
 117     DATA_TYPE res, res1, res2;
 118     int index, shift;
 119     unsigned long physaddr, tlb_addr, addr1, addr2;
 120
 121     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 122  redo:
 123     tlb_addr = env->tlb_read[is_user][index].address;
 124     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 125         physaddr = addr + env->tlb_read[is_user][index].addend;
 126         if (tlb_addr & ~TARGET_PAGE_MASK) {
 127             /* IO access */
 128             if ((addr & (DATA_SIZE - 1)) != 0)
 129                 goto do_unaligned_access;
 130             res = glue(io_read, SUFFIX)(physaddr, tlb_addr);
 131         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 132         do_unaligned_access:
 133             /* slow unaligned access (it spans two pages) */
 134             addr1 = addr & ~(DATA_SIZE - 1);
 135             addr2 = addr1 + DATA_SIZE;
 136             res1 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr1,
 137                                                           is_user, retaddr);
 138             res2 = glue(glue(slow_ld, SUFFIX), MMUSUFFIX)(addr2,
 139                                                           is_user, retaddr);
 140             shift = (addr & (DATA_SIZE - 1)) * 8;
 141 #ifdef TARGET_WORDS_BIGENDIAN
 142             res = (res1 << shift) | (res2 >> ((DATA_SIZE * 8) - shift));
 143 #else
 144             res = (res1 >> shift) | (res2 << ((DATA_SIZE * 8) - shift));
 145 #endif
 146             res = (DATA_TYPE)res;
 147         } else {
 148             /* unaligned/aligned access in the same page */
 149             res = glue(glue(ld, USUFFIX), _raw)((uint8_t *)physaddr);
 150         }
 151     } else {
 152         /* the page is not in the TLB : fill it */
 153         tlb_fill(addr, READ_ACCESS_TYPE, is_user, retaddr);
 154         goto redo;
 155     }
 156     return res;
 157 }
 158
 159 #ifndef SOFTMMU_CODE_ACCESS
 160
 161 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
 162                                                    DATA_TYPE val,
 163                                                    int is_user,
 164                                                    void *retaddr);
 165
 166 static inline void glue(io_write, SUFFIX)(unsigned long physaddr,
 167                                           DATA_TYPE val,
 168                                           unsigned long tlb_addr,
 169                                           void *retaddr)
 170 {
 171     int index;
 172
 173     index = (tlb_addr >> IO_MEM_SHIFT) & (IO_MEM_NB_ENTRIES - 1);
 174     env->mem_write_vaddr = tlb_addr;
 175     env->mem_write_pc = (unsigned long)retaddr;
 176 #if SHIFT <= 2
 177     io_mem_write[index][SHIFT](io_mem_opaque[index], physaddr, val);
 178 #else
 179 #ifdef TARGET_WORDS_BIGENDIAN
 180     io_mem_write[index][2](io_mem_opaque[index], physaddr, val >> 32);
 181     io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val);
 182 #else
 183     io_mem_write[index][2](io_mem_opaque[index], physaddr, val);
 184     io_mem_write[index][2](io_mem_opaque[index], physaddr + 4, val >> 32);
 185 #endif
 186 #endif /* SHIFT > 2 */
 187 }
 188
 189 void REGPARM(2) glue(glue(__st, SUFFIX), MMUSUFFIX)(unsigned long addr,
 190                                                     DATA_TYPE val,
 191                                                     int is_user)
 192 {
 193     unsigned long physaddr, tlb_addr;
 194     void *retaddr;
 195     int index;
 196
 197     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 198  redo:
 199     tlb_addr = env->tlb_write[is_user][index].address;
 200     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 201         physaddr = addr + env->tlb_write[is_user][index].addend;
 202         if (tlb_addr & ~TARGET_PAGE_MASK) {
 203             /* IO access */
 204             if ((addr & (DATA_SIZE - 1)) != 0)
 205                 goto do_unaligned_access;
 206             retaddr = GETPC();
 207             glue(io_write, SUFFIX)(physaddr, val, tlb_addr, retaddr);
 208         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 209         do_unaligned_access:
 210             retaddr = GETPC();
 211             glue(glue(slow_st, SUFFIX), MMUSUFFIX)(addr, val,
 212                                                    is_user, retaddr);
 213         } else {
 214             /* aligned/unaligned access in the same page */
 215             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 216         }
 217     } else {
 218         /* the page is not in the TLB : fill it */
 219         retaddr = GETPC();
 220         tlb_fill(addr, 1, is_user, retaddr);
 221         goto redo;
 222     }
 223 }
 224
 225 /* handles all unaligned cases */
 226 static void glue(glue(slow_st, SUFFIX), MMUSUFFIX)(unsigned long addr,
 227                                                    DATA_TYPE val,
 228                                                    int is_user,
 229                                                    void *retaddr)
 230 {
 231     unsigned long physaddr, tlb_addr;
 232     int index, i;
 233
 234     index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
 235  redo:
 236     tlb_addr = env->tlb_write[is_user][index].address;
 237     if ((addr & TARGET_PAGE_MASK) == (tlb_addr & (TARGET_PAGE_MASK | TLB_INVALID_MASK))) {
 238         physaddr = addr + env->tlb_write[is_user][index].addend;
 239         if (tlb_addr & ~TARGET_PAGE_MASK) {
 240             /* IO access */
 241             if ((addr & (DATA_SIZE - 1)) != 0)
 242                 goto do_unaligned_access;
 243             glue(io_write, SUFFIX)(physaddr, val, tlb_addr, retaddr);
 244         } else if (((addr & 0xfff) + DATA_SIZE - 1) >= TARGET_PAGE_SIZE) {
 245         do_unaligned_access:
 246             /* XXX: not efficient, but simple */
 247             for(i = 0;i < DATA_SIZE; i++) {
 248 #ifdef TARGET_WORDS_BIGENDIAN
 249                 glue(slow_stb, MMUSUFFIX)(addr + i, val >> (((DATA_SIZE - 1) * 8) - (i * 8)),
 250                                           is_user, retaddr);
 251 #else
 252                 glue(slow_stb, MMUSUFFIX)(addr + i, val >> (i * 8),
 253                                           is_user, retaddr);
 254 #endif
 255             }
 256         } else {
 257             /* aligned/unaligned access in the same page */
 258             glue(glue(st, SUFFIX), _raw)((uint8_t *)physaddr, val);
 259         }
 260     } else {
 261         /* the page is not in the TLB : fill it */
 262         tlb_fill(addr, 1, is_user, retaddr);
 263         goto redo;
 264     }
 265 }
 266
 267 #endif /* !defined(SOFTMMU_CODE_ACCESS) */
 268
 269 #undef READ_ACCESS_TYPE
 270 #undef SHIFT
 271 #undef DATA_TYPE
 272 #undef SUFFIX
 273 #undef USUFFIX
 274 #undef DATA_SIZE