sim/bfin/dv-bfin_mmu.c

   1 /* Blackfin Memory Management Unit (MMU) model.
   2
   3    Copyright (C) 2010-2021 Free Software Foundation, Inc.
   4    Contributed by Analog Devices, Inc.
   5
   6    This file is part of simulators.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22
  23 #include "sim-main.h"
  24 #include "sim-options.h"
  25 #include "devices.h"
  26 #include "dv-bfin_mmu.h"
  27 #include "dv-bfin_cec.h"
  28
  29 /* XXX: Should this really be two blocks of registers ?  PRM describes
  30         these as two Content Addressable Memory (CAM) blocks.  */
  31
  32 struct bfin_mmu
  33 {
  34   bu32 base;
  35
  36   /* Order after here is important -- matches hardware MMR layout.  */
  37   bu32 sram_base_address;
  38
  39   bu32 dmem_control, dcplb_fault_status, dcplb_fault_addr;
  40   char _dpad0[0x100 - 0x0 - (4 * 4)];
  41   bu32 dcplb_addr[16];
  42   char _dpad1[0x200 - 0x100 - (4 * 16)];
  43   bu32 dcplb_data[16];
  44   char _dpad2[0x300 - 0x200 - (4 * 16)];
  45   bu32 dtest_command;
  46   char _dpad3[0x400 - 0x300 - (4 * 1)];
  47   bu32 dtest_data[2];
  48
  49   char _dpad4[0x1000 - 0x400 - (4 * 2)];
  50
  51   bu32 idk;     /* Filler MMR; hardware simply ignores.  */
  52   bu32 imem_control, icplb_fault_status, icplb_fault_addr;
  53   char _ipad0[0x100 - 0x0 - (4 * 4)];
  54   bu32 icplb_addr[16];
  55   char _ipad1[0x200 - 0x100 - (4 * 16)];
  56   bu32 icplb_data[16];
  57   char _ipad2[0x300 - 0x200 - (4 * 16)];
  58   bu32 itest_command;
  59   char _ipad3[0x400 - 0x300 - (4 * 1)];
  60   bu32 itest_data[2];
  61 };
  62 #define mmr_base()      offsetof(struct bfin_mmu, sram_base_address)
  63 #define mmr_offset(mmr) (offsetof(struct bfin_mmu, mmr) - mmr_base())
  64 #define mmr_idx(mmr)    (mmr_offset (mmr) / 4)
  65
  66 static const char * const mmr_names[BFIN_COREMMR_MMU_SIZE / 4] =
  67 {
  68   "SRAM_BASE_ADDRESS", "DMEM_CONTROL", "DCPLB_FAULT_STATUS", "DCPLB_FAULT_ADDR",
  69   [mmr_idx (dcplb_addr[0])] = "DCPLB_ADDR0",
  70   "DCPLB_ADDR1", "DCPLB_ADDR2", "DCPLB_ADDR3", "DCPLB_ADDR4", "DCPLB_ADDR5",
  71   "DCPLB_ADDR6", "DCPLB_ADDR7", "DCPLB_ADDR8", "DCPLB_ADDR9", "DCPLB_ADDR10",
  72   "DCPLB_ADDR11", "DCPLB_ADDR12", "DCPLB_ADDR13", "DCPLB_ADDR14", "DCPLB_ADDR15",
  73   [mmr_idx (dcplb_data[0])] = "DCPLB_DATA0",
  74   "DCPLB_DATA1", "DCPLB_DATA2", "DCPLB_DATA3", "DCPLB_DATA4", "DCPLB_DATA5",
  75   "DCPLB_DATA6", "DCPLB_DATA7", "DCPLB_DATA8", "DCPLB_DATA9", "DCPLB_DATA10",
  76   "DCPLB_DATA11", "DCPLB_DATA12", "DCPLB_DATA13", "DCPLB_DATA14", "DCPLB_DATA15",
  77   [mmr_idx (dtest_command)] = "DTEST_COMMAND",
  78   [mmr_idx (dtest_data[0])] = "DTEST_DATA0", "DTEST_DATA1",
  79   [mmr_idx (imem_control)] = "IMEM_CONTROL", "ICPLB_FAULT_STATUS", "ICPLB_FAULT_ADDR",
  80   [mmr_idx (icplb_addr[0])] = "ICPLB_ADDR0",
  81   "ICPLB_ADDR1", "ICPLB_ADDR2", "ICPLB_ADDR3", "ICPLB_ADDR4", "ICPLB_ADDR5",
  82   "ICPLB_ADDR6", "ICPLB_ADDR7", "ICPLB_ADDR8", "ICPLB_ADDR9", "ICPLB_ADDR10",
  83   "ICPLB_ADDR11", "ICPLB_ADDR12", "ICPLB_ADDR13", "ICPLB_ADDR14", "ICPLB_ADDR15",
  84   [mmr_idx (icplb_data[0])] = "ICPLB_DATA0",
  85   "ICPLB_DATA1", "ICPLB_DATA2", "ICPLB_DATA3", "ICPLB_DATA4", "ICPLB_DATA5",
  86   "ICPLB_DATA6", "ICPLB_DATA7", "ICPLB_DATA8", "ICPLB_DATA9", "ICPLB_DATA10",
  87   "ICPLB_DATA11", "ICPLB_DATA12", "ICPLB_DATA13", "ICPLB_DATA14", "ICPLB_DATA15",
  88   [mmr_idx (itest_command)] = "ITEST_COMMAND",
  89   [mmr_idx (itest_data[0])] = "ITEST_DATA0", "ITEST_DATA1",
  90 };
  91 #define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
  92
  93 static bool bfin_mmu_skip_cplbs = false;
  94
  95 static unsigned
  96 bfin_mmu_io_write_buffer (struct hw *me, const void *source,
  97                           int space, address_word addr, unsigned nr_bytes)
  98 {
  99   struct bfin_mmu *mmu = hw_data (me);
 100   bu32 mmr_off;
 101   bu32 value;
 102   bu32 *valuep;
 103
 104   /* Invalid access mode is higher priority than missing register.  */
 105   if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
 106     return 0;
 107
 108   value = dv_load_4 (source);
 109
 110   mmr_off = addr - mmu->base;
 111   valuep = (void *)((unsigned long)mmu + mmr_base() + mmr_off);
 112
 113   HW_TRACE_WRITE ();
 114
 115   switch (mmr_off)
 116     {
 117     case mmr_offset(dmem_control):
 118     case mmr_offset(imem_control):
 119       /* XXX: IMC/DMC bit should add/remove L1 cache regions ...  */
 120     case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[1]):
 121     case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[1]):
 122     case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
 123     case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
 124     case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
 125     case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
 126       *valuep = value;
 127       break;
 128     case mmr_offset(sram_base_address):
 129     case mmr_offset(dcplb_fault_status):
 130     case mmr_offset(dcplb_fault_addr):
 131     case mmr_offset(idk):
 132     case mmr_offset(icplb_fault_status):
 133     case mmr_offset(icplb_fault_addr):
 134       /* Discard writes to these.  */
 135       break;
 136     case mmr_offset(itest_command):
 137       /* XXX: Not supported atm.  */
 138       if (value)
 139         hw_abort (me, "ITEST_COMMAND unimplemented");
 140       break;
 141     case mmr_offset(dtest_command):
 142       /* Access L1 memory indirectly.  */
 143       *valuep = value;
 144       if (value)
 145         {
 146           bu32 addr = mmu->sram_base_address   |
 147             ((value >> (26 - 11)) & (1 << 11)) | /* addr bit 11 (Way0/Way1)   */
 148             ((value >> (24 - 21)) & (1 << 21)) | /* addr bit 21 (Data/Inst)   */
 149             ((value >> (23 - 15)) & (1 << 15)) | /* addr bit 15 (Data Bank)   */
 150             ((value >> (16 - 12)) & (3 << 12)) | /* addr bits 13:12 (Subbank) */
 151             (value & 0x47F8);                    /* addr bits 14 & 10:3       */
 152
 153           if (!(value & TEST_DATA_ARRAY))
 154             hw_abort (me, "DTEST_COMMAND tag array unimplemented");
 155           if (value & 0xfa7cb801)
 156             hw_abort (me, "DTEST_COMMAND bits undefined");
 157
 158           if (value & TEST_WRITE)
 159             sim_write (hw_system (me), addr, (void *)mmu->dtest_data, 8);
 160           else
 161             sim_read (hw_system (me), addr, (void *)mmu->dtest_data, 8);
 162         }
 163       break;
 164     default:
 165       dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
 166       return 0;
 167     }
 168
 169   return nr_bytes;
 170 }
 171
 172 static unsigned
 173 bfin_mmu_io_read_buffer (struct hw *me, void *dest,
 174                          int space, address_word addr, unsigned nr_bytes)
 175 {
 176   struct bfin_mmu *mmu = hw_data (me);
 177   bu32 mmr_off;
 178   bu32 *valuep;
 179
 180   /* Invalid access mode is higher priority than missing register.  */
 181   if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
 182     return 0;
 183
 184   mmr_off = addr - mmu->base;
 185   valuep = (void *)((unsigned long)mmu + mmr_base() + mmr_off);
 186
 187   HW_TRACE_READ ();
 188
 189   switch (mmr_off)
 190     {
 191     case mmr_offset(dmem_control):
 192     case mmr_offset(imem_control):
 193     case mmr_offset(dtest_command):
 194     case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[2]):
 195     case mmr_offset(itest_command):
 196     case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[2]):
 197       /* XXX: should do something here.  */
 198     case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
 199     case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
 200     case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
 201     case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
 202     case mmr_offset(sram_base_address):
 203     case mmr_offset(dcplb_fault_status):
 204     case mmr_offset(dcplb_fault_addr):
 205     case mmr_offset(idk):
 206     case mmr_offset(icplb_fault_status):
 207     case mmr_offset(icplb_fault_addr):
 208       dv_store_4 (dest, *valuep);
 209       break;
 210     default:
 211       dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
 212       return 0;
 213     }
 214
 215   return nr_bytes;
 216 }
 217
 218 static void
 219 attach_bfin_mmu_regs (struct hw *me, struct bfin_mmu *mmu)
 220 {
 221   address_word attach_address;
 222   int attach_space;
 223   unsigned attach_size;
 224   reg_property_spec reg;
 225
 226   if (hw_find_property (me, "reg") == NULL)
 227     hw_abort (me, "Missing \"reg\" property");
 228
 229   if (!hw_find_reg_array_property (me, "reg", 0, &reg))
 230     hw_abort (me, "\"reg\" property must contain three addr/size entries");
 231
 232   hw_unit_address_to_attach_address (hw_parent (me),
 233                                      &reg.address,
 234                                      &attach_space, &attach_address, me);
 235   hw_unit_size_to_attach_size (hw_parent (me), &reg.size, &attach_size, me);
 236
 237   if (attach_size != BFIN_COREMMR_MMU_SIZE)
 238     hw_abort (me, "\"reg\" size must be %#x", BFIN_COREMMR_MMU_SIZE);
 239
 240   hw_attach_address (hw_parent (me),
 241                      0, attach_space, attach_address, attach_size, me);
 242
 243   mmu->base = attach_address;
 244 }
 245
 246 static void
 247 bfin_mmu_finish (struct hw *me)
 248 {
 249   struct bfin_mmu *mmu;
 250
 251   mmu = HW_ZALLOC (me, struct bfin_mmu);
 252
 253   set_hw_data (me, mmu);
 254   set_hw_io_read_buffer (me, bfin_mmu_io_read_buffer);
 255   set_hw_io_write_buffer (me, bfin_mmu_io_write_buffer);
 256
 257   attach_bfin_mmu_regs (me, mmu);
 258
 259   /* Initialize the MMU.  */
 260   mmu->sram_base_address = 0xff800000 - 0;
 261                            /*(4 * 1024 * 1024 * CPU_INDEX (hw_system_cpu (me)));*/
 262   mmu->dmem_control = 0x00000001;
 263   mmu->imem_control = 0x00000001;
 264 }
 265
 266 const struct hw_descriptor dv_bfin_mmu_descriptor[] =
 267 {
 268   {"bfin_mmu", bfin_mmu_finish,},
 269   {NULL, NULL},
 270 };
 271 \f
 272 /* Device option parsing.  */
 273
 274 static DECLARE_OPTION_HANDLER (bfin_mmu_option_handler);
 275
 276 enum {
 277   OPTION_MMU_SKIP_TABLES = OPTION_START,
 278 };
 279
 280 const OPTION bfin_mmu_options[] =
 281 {
 282   { {"mmu-skip-cplbs", no_argument, NULL, OPTION_MMU_SKIP_TABLES },
 283       '\0', NULL, "Skip parsing of CPLB tables (big speed increase)",
 284       bfin_mmu_option_handler, NULL },
 285
 286   { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
 287 };
 288
 289 static SIM_RC
 290 bfin_mmu_option_handler (SIM_DESC sd, sim_cpu *current_cpu, int opt,
 291                          char *arg, int is_command)
 292 {
 293   switch (opt)
 294     {
 295     case OPTION_MMU_SKIP_TABLES:
 296       bfin_mmu_skip_cplbs = true;
 297       return SIM_RC_OK;
 298
 299     default:
 300       sim_io_eprintf (sd, "Unknown Blackfin MMU option %d\n", opt);
 301       return SIM_RC_FAIL;
 302     }
 303 }
 304 \f
 305 #define MMU_STATE(cpu) DV_STATE_CACHED (cpu, mmu)
 306
 307 static void
 308 _mmu_log_ifault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 pc, bool supv)
 309 {
 310   mmu->icplb_fault_addr = pc;
 311   mmu->icplb_fault_status = supv << 17;
 312 }
 313
 314 void
 315 mmu_log_ifault (SIM_CPU *cpu)
 316 {
 317   _mmu_log_ifault (cpu, MMU_STATE (cpu), PCREG, cec_get_ivg (cpu) >= 0);
 318 }
 319
 320 static void
 321 _mmu_log_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
 322                 bool inst, bool miss, bool supv, bool dag1, bu32 faults)
 323 {
 324   bu32 *fault_status, *fault_addr;
 325
 326   /* No logging in non-OS mode.  */
 327   if (!mmu)
 328     return;
 329
 330   fault_status = inst ? &mmu->icplb_fault_status : &mmu->dcplb_fault_status;
 331   fault_addr = inst ? &mmu->icplb_fault_addr : &mmu->dcplb_fault_addr;
 332   /* ICPLB regs always get updated.  */
 333   if (!inst)
 334     _mmu_log_ifault (cpu, mmu, PCREG, supv);
 335
 336   *fault_addr = addr;
 337   *fault_status =
 338         (miss << 19) |
 339         (dag1 << 18) |
 340         (supv << 17) |
 341         (write << 16) |
 342         faults;
 343 }
 344
 345 static void
 346 _mmu_process_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
 347                     bool inst, bool unaligned, bool miss, bool supv, bool dag1)
 348 {
 349   int excp;
 350
 351   /* See order in mmu_check_addr() */
 352   if (unaligned)
 353     excp = inst ? VEC_MISALI_I : VEC_MISALI_D;
 354   else if (addr >= BFIN_SYSTEM_MMR_BASE)
 355     excp = VEC_ILL_RES;
 356   else if (!mmu)
 357     excp = inst ? VEC_CPLB_I_M : VEC_CPLB_M;
 358   else
 359     {
 360       /* Misses are hardware errors.  */
 361       cec_hwerr (cpu, HWERR_EXTERN_ADDR);
 362       return;
 363     }
 364
 365   _mmu_log_fault (cpu, mmu, addr, write, inst, miss, supv, dag1, 0);
 366   cec_exception (cpu, excp);
 367 }
 368
 369 void
 370 mmu_process_fault (SIM_CPU *cpu, bu32 addr, bool write, bool inst,
 371                    bool unaligned, bool miss)
 372 {
 373   SIM_DESC sd = CPU_STATE (cpu);
 374   struct bfin_mmu *mmu;
 375
 376   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
 377     mmu = NULL;
 378   else
 379     mmu = MMU_STATE (cpu);
 380
 381   _mmu_process_fault (cpu, mmu, addr, write, inst, unaligned, miss,
 382                       cec_is_supervisor_mode (cpu),
 383                       BFIN_CPU_STATE.multi_pc == PCREG + 6);
 384 }
 385
 386 /* Return values:
 387     -2: no known problems
 388     -1: valid
 389      0: miss
 390      1: protection violation
 391      2: multiple hits
 392      3: unaligned
 393      4: miss; hwerr  */
 394 static int
 395 mmu_check_implicit_addr (SIM_CPU *cpu, bu32 addr, bool inst, int size,
 396                          bool supv, bool dag1)
 397 {
 398   bool l1 = ((addr & 0xFF000000) == 0xFF000000);
 399   bu32 amask = (addr & 0xFFF00000);
 400
 401   if (addr & (size - 1))
 402     return 3;
 403
 404   /* MMRs may never be executable or accessed from usermode.  */
 405   if (addr >= BFIN_SYSTEM_MMR_BASE)
 406     {
 407       if (inst)
 408         return 0;
 409       else if (!supv || dag1)
 410         return 1;
 411       else
 412         return -1;
 413     }
 414   else if (inst)
 415     {
 416       /* Some regions are not executable.  */
 417       /* XXX: Should this be in the model data ?  Core B 561 ?  */
 418       if (l1)
 419         return (amask == 0xFFA00000) ? -1 : 1;
 420     }
 421   else
 422     {
 423       /* Some regions are not readable.  */
 424       /* XXX: Should this be in the model data ?  Core B 561 ?  */
 425       if (l1)
 426         return (amask != 0xFFA00000) ? -1 : 4;
 427     }
 428
 429   return -2;
 430 }
 431
 432 /* Exception order per the PRM (first has highest):
 433      Inst Multiple CPLB Hits
 434      Inst Misaligned Access
 435      Inst Protection Violation
 436      Inst CPLB Miss
 437   Only the alignment matters in non-OS mode though.  */
 438 static int
 439 _mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
 440 {
 441   SIM_DESC sd = CPU_STATE (cpu);
 442   struct bfin_mmu *mmu;
 443   bu32 *fault_status, *fault_addr, *mem_control, *cplb_addr, *cplb_data;
 444   bu32 faults;
 445   bool supv, do_excp, dag1;
 446   int i, hits;
 447
 448   supv = cec_is_supervisor_mode (cpu);
 449   dag1 = (BFIN_CPU_STATE.multi_pc == PCREG + 6);
 450
 451   if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT || bfin_mmu_skip_cplbs)
 452     {
 453       int ret = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
 454       /* Valid hits and misses are OK in non-OS envs.  */
 455       if (ret < 0)
 456         return 0;
 457       _mmu_process_fault (cpu, NULL, addr, write, inst, (ret == 3), false, supv, dag1);
 458     }
 459
 460   mmu = MMU_STATE (cpu);
 461   fault_status = inst ? &mmu->icplb_fault_status : &mmu->dcplb_fault_status;
 462   fault_addr = inst ? &mmu->icplb_fault_addr : &mmu->dcplb_fault_addr;
 463   mem_control = inst ? &mmu->imem_control : &mmu->dmem_control;
 464   cplb_addr = inst ? &mmu->icplb_addr[0] : &mmu->dcplb_addr[0];
 465   cplb_data = inst ? &mmu->icplb_data[0] : &mmu->dcplb_data[0];
 466
 467   faults = 0;
 468   hits = 0;
 469   do_excp = false;
 470
 471   /* CPLBs disabled -> little to do.  */
 472   if (!(*mem_control & ENCPLB))
 473     {
 474       hits = 1;
 475       goto implicit_check;
 476     }
 477
 478   /* Check all the CPLBs first.  */
 479   for (i = 0; i < 16; ++i)
 480     {
 481       const bu32 pages[4] = { 0x400, 0x1000, 0x100000, 0x400000 };
 482       bu32 addr_lo, addr_hi;
 483
 484       /* Skip invalid entries.  */
 485       if (!(cplb_data[i] & CPLB_VALID))
 486         continue;
 487
 488       /* See if this entry covers this address.  */
 489       addr_lo = cplb_addr[i];
 490       addr_hi = cplb_addr[i] + pages[(cplb_data[i] & PAGE_SIZE) >> 16];
 491       if (addr < addr_lo || addr >= addr_hi)
 492         continue;
 493
 494       ++hits;
 495       faults |= (1 << i);
 496       if (write)
 497         {
 498           if (!supv && !(cplb_data[i] & CPLB_USER_WR))
 499             do_excp = true;
 500           if (supv && !(cplb_data[i] & CPLB_SUPV_WR))
 501             do_excp = true;
 502           if ((cplb_data[i] & (CPLB_WT | CPLB_L1_CHBL | CPLB_DIRTY)) == CPLB_L1_CHBL)
 503             do_excp = true;
 504         }
 505       else
 506         {
 507           if (!supv && !(cplb_data[i] & CPLB_USER_RD))
 508             do_excp = true;
 509         }
 510     }
 511
 512   /* Handle default/implicit CPLBs.  */
 513   if (!do_excp && hits < 2)
 514     {
 515       int ihits;
 516  implicit_check:
 517       ihits = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
 518       switch (ihits)
 519         {
 520         /* No faults and one match -> good to go.  */
 521         case -1: return 0;
 522         case -2:
 523           if (hits == 1)
 524             return 0;
 525           break;
 526         case 4:
 527           cec_hwerr (cpu, HWERR_EXTERN_ADDR);
 528           return 0;
 529         default:
 530           hits = ihits;
 531         }
 532     }
 533   else
 534     /* Normalize hit count so hits==2 is always multiple hit exception.  */
 535     hits = min (2, hits);
 536
 537   _mmu_log_fault (cpu, mmu, addr, write, inst, hits == 0, supv, dag1, faults);
 538
 539   if (inst)
 540     {
 541       int iexcps[] = { VEC_CPLB_I_M, VEC_CPLB_I_VL, VEC_CPLB_I_MHIT, VEC_MISALI_I };
 542       return iexcps[hits];
 543     }
 544   else
 545     {
 546       int dexcps[] = { VEC_CPLB_M, VEC_CPLB_VL, VEC_CPLB_MHIT, VEC_MISALI_D };
 547       return dexcps[hits];
 548     }
 549 }
 550
 551 void
 552 mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
 553 {
 554   int excp = _mmu_check_addr (cpu, addr, write, inst, size);
 555   if (excp)
 556     cec_exception (cpu, excp);
 557 }
 558
 559 void
 560 mmu_check_cache_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst)
 561 {
 562   bu32 cacheaddr;
 563   int excp;
 564
 565   cacheaddr = addr & ~(BFIN_L1_CACHE_BYTES - 1);
 566   excp = _mmu_check_addr (cpu, cacheaddr, write, inst, BFIN_L1_CACHE_BYTES);
 567   if (excp == 0)
 568     return;
 569
 570   /* Most exceptions are ignored with cache funcs.  */
 571   /* XXX: Not sure if we should be ignoring CPLB misses.  */
 572   if (inst)
 573     {
 574       if (excp == VEC_CPLB_I_VL)
 575         return;
 576     }
 577   else
 578     {
 579       if (excp == VEC_CPLB_VL)
 580         return;
 581     }
 582   cec_exception (cpu, excp);
 583 }