1 /* Blackfin Memory Management Unit (MMU) model.
3 Copyright (C) 2010-2013 Free Software Foundation, Inc.
4 Contributed by Analog Devices, Inc.
6 This file is part of simulators.
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.
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.
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/>. */
24 #include "sim-options.h"
26 #include "dv-bfin_mmu.h"
27 #include "dv-bfin_cec.h"
29 /* XXX: Should this really be two blocks of registers ? PRM describes
30 these as two Content Addressable Memory (CAM) blocks. */
36 /* Order after here is important -- matches hardware MMR layout. */
37 bu32 sram_base_address;
39 bu32 dmem_control, dcplb_fault_status, dcplb_fault_addr;
40 char _dpad0[0x100 - 0x0 - (4 * 4)];
42 char _dpad1[0x200 - 0x100 - (4 * 16)];
44 char _dpad2[0x300 - 0x200 - (4 * 16)];
46 char _dpad3[0x400 - 0x300 - (4 * 1)];
49 char _dpad4[0x1000 - 0x400 - (4 * 2)];
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)];
55 char _ipad1[0x200 - 0x100 - (4 * 16)];
57 char _ipad2[0x300 - 0x200 - (4 * 16)];
59 char _ipad3[0x400 - 0x300 - (4 * 1)];
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)
66 static const char * const mmr_names[BFIN_COREMMR_MMU_SIZE / 4] =
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",
91 #define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
93 static bool bfin_mmu_skip_cplbs = false;
96 bfin_mmu_io_write_buffer (struct hw *me, const void *source,
97 int space, address_word addr, unsigned nr_bytes)
99 struct bfin_mmu *mmu = hw_data (me);
104 value = dv_load_4 (source);
106 mmr_off = addr - mmu->base;
107 valuep = (void *)((unsigned long)mmu + mmr_base() + mmr_off);
113 case mmr_offset(dmem_control):
114 case mmr_offset(imem_control):
115 /* XXX: IMC/DMC bit should add/remove L1 cache regions ... */
116 case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[1]):
117 case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[1]):
118 case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
119 case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
120 case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
121 case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
124 case mmr_offset(sram_base_address):
125 case mmr_offset(dcplb_fault_status):
126 case mmr_offset(dcplb_fault_addr):
127 case mmr_offset(idk):
128 case mmr_offset(icplb_fault_status):
129 case mmr_offset(icplb_fault_addr):
130 /* Discard writes to these. */
132 case mmr_offset(itest_command):
133 /* XXX: Not supported atm. */
135 hw_abort (me, "ITEST_COMMAND unimplemented");
137 case mmr_offset(dtest_command):
138 /* Access L1 memory indirectly. */
142 bu32 addr = mmu->sram_base_address |
143 ((value >> (26 - 11)) & (1 << 11)) | /* addr bit 11 (Way0/Way1) */
144 ((value >> (24 - 21)) & (1 << 21)) | /* addr bit 21 (Data/Inst) */
145 ((value >> (23 - 15)) & (1 << 15)) | /* addr bit 15 (Data Bank) */
146 ((value >> (16 - 12)) & (3 << 12)) | /* addr bits 13:12 (Subbank) */
147 (value & 0x47F8); /* addr bits 14 & 10:3 */
149 if (!(value & TEST_DATA_ARRAY))
150 hw_abort (me, "DTEST_COMMAND tag array unimplemented");
151 if (value & 0xfa7cb801)
152 hw_abort (me, "DTEST_COMMAND bits undefined");
154 if (value & TEST_WRITE)
155 sim_write (hw_system (me), addr, (void *)mmu->dtest_data, 8);
157 sim_read (hw_system (me), addr, (void *)mmu->dtest_data, 8);
161 dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
169 bfin_mmu_io_read_buffer (struct hw *me, void *dest,
170 int space, address_word addr, unsigned nr_bytes)
172 struct bfin_mmu *mmu = hw_data (me);
176 mmr_off = addr - mmu->base;
177 valuep = (void *)((unsigned long)mmu + mmr_base() + mmr_off);
183 case mmr_offset(dmem_control):
184 case mmr_offset(imem_control):
185 case mmr_offset(dtest_command):
186 case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[2]):
187 case mmr_offset(itest_command):
188 case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[2]):
189 /* XXX: should do something here. */
190 case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
191 case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
192 case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
193 case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
194 case mmr_offset(sram_base_address):
195 case mmr_offset(dcplb_fault_status):
196 case mmr_offset(dcplb_fault_addr):
197 case mmr_offset(idk):
198 case mmr_offset(icplb_fault_status):
199 case mmr_offset(icplb_fault_addr):
200 dv_store_4 (dest, *valuep);
203 while (1) /* Core MMRs -> exception -> doesn't return. */
204 dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
212 attach_bfin_mmu_regs (struct hw *me, struct bfin_mmu *mmu)
214 address_word attach_address;
216 unsigned attach_size;
217 reg_property_spec reg;
219 if (hw_find_property (me, "reg") == NULL)
220 hw_abort (me, "Missing \"reg\" property");
222 if (!hw_find_reg_array_property (me, "reg", 0, ®))
223 hw_abort (me, "\"reg\" property must contain three addr/size entries");
225 hw_unit_address_to_attach_address (hw_parent (me),
227 &attach_space, &attach_address, me);
228 hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me);
230 if (attach_size != BFIN_COREMMR_MMU_SIZE)
231 hw_abort (me, "\"reg\" size must be %#x", BFIN_COREMMR_MMU_SIZE);
233 hw_attach_address (hw_parent (me),
234 0, attach_space, attach_address, attach_size, me);
236 mmu->base = attach_address;
240 bfin_mmu_finish (struct hw *me)
242 struct bfin_mmu *mmu;
244 mmu = HW_ZALLOC (me, struct bfin_mmu);
246 set_hw_data (me, mmu);
247 set_hw_io_read_buffer (me, bfin_mmu_io_read_buffer);
248 set_hw_io_write_buffer (me, bfin_mmu_io_write_buffer);
250 attach_bfin_mmu_regs (me, mmu);
252 /* Initialize the MMU. */
253 mmu->sram_base_address = 0xff800000 - 0;
254 /*(4 * 1024 * 1024 * CPU_INDEX (hw_system_cpu (me)));*/
255 mmu->dmem_control = 0x00000001;
256 mmu->imem_control = 0x00000001;
259 const struct hw_descriptor dv_bfin_mmu_descriptor[] =
261 {"bfin_mmu", bfin_mmu_finish,},
265 /* Device option parsing. */
267 static DECLARE_OPTION_HANDLER (bfin_mmu_option_handler);
270 OPTION_MMU_SKIP_TABLES = OPTION_START,
273 const OPTION bfin_mmu_options[] =
275 { {"mmu-skip-cplbs", no_argument, NULL, OPTION_MMU_SKIP_TABLES },
276 '\0', NULL, "Skip parsing of CPLB tables (big speed increase)",
277 bfin_mmu_option_handler, NULL },
279 { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
283 bfin_mmu_option_handler (SIM_DESC sd, sim_cpu *current_cpu, int opt,
284 char *arg, int is_command)
288 case OPTION_MMU_SKIP_TABLES:
289 bfin_mmu_skip_cplbs = true;
293 sim_io_eprintf (sd, "Unknown Blackfin MMU option %d\n", opt);
298 #define MMU_STATE(cpu) DV_STATE_CACHED (cpu, mmu)
301 _mmu_log_ifault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 pc, bool supv)
303 mmu->icplb_fault_addr = pc;
304 mmu->icplb_fault_status = supv << 17;
308 mmu_log_ifault (SIM_CPU *cpu)
310 _mmu_log_ifault (cpu, MMU_STATE (cpu), PCREG, cec_get_ivg (cpu) >= 0);
314 _mmu_log_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
315 bool inst, bool miss, bool supv, bool dag1, bu32 faults)
317 bu32 *fault_status, *fault_addr;
319 /* No logging in non-OS mode. */
323 fault_status = inst ? &mmu->icplb_fault_status : &mmu->dcplb_fault_status;
324 fault_addr = inst ? &mmu->icplb_fault_addr : &mmu->dcplb_fault_addr;
325 /* ICPLB regs always get updated. */
327 _mmu_log_ifault (cpu, mmu, PCREG, supv);
339 _mmu_process_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
340 bool inst, bool unaligned, bool miss, bool supv, bool dag1)
344 /* See order in mmu_check_addr() */
346 excp = inst ? VEC_MISALI_I : VEC_MISALI_D;
347 else if (addr >= BFIN_SYSTEM_MMR_BASE)
350 excp = inst ? VEC_CPLB_I_M : VEC_CPLB_M;
353 /* Misses are hardware errors. */
354 cec_hwerr (cpu, HWERR_EXTERN_ADDR);
358 _mmu_log_fault (cpu, mmu, addr, write, inst, miss, supv, dag1, 0);
359 cec_exception (cpu, excp);
363 mmu_process_fault (SIM_CPU *cpu, bu32 addr, bool write, bool inst,
364 bool unaligned, bool miss)
366 SIM_DESC sd = CPU_STATE (cpu);
367 struct bfin_mmu *mmu;
369 if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
372 mmu = MMU_STATE (cpu);
374 _mmu_process_fault (cpu, mmu, addr, write, inst, unaligned, miss,
375 cec_is_supervisor_mode (cpu),
376 BFIN_CPU_STATE.multi_pc == PCREG + 6);
380 -2: no known problems
383 1: protection violation
388 mmu_check_implicit_addr (SIM_CPU *cpu, bu32 addr, bool inst, int size,
389 bool supv, bool dag1)
391 bool l1 = ((addr & 0xFF000000) == 0xFF000000);
392 bu32 amask = (addr & 0xFFF00000);
394 if (addr & (size - 1))
397 /* MMRs may never be executable or accessed from usermode. */
398 if (addr >= BFIN_SYSTEM_MMR_BASE)
402 else if (!supv || dag1)
409 /* Some regions are not executable. */
410 /* XXX: Should this be in the model data ? Core B 561 ? */
412 return (amask == 0xFFA00000) ? -1 : 1;
416 /* Some regions are not readable. */
417 /* XXX: Should this be in the model data ? Core B 561 ? */
419 return (amask != 0xFFA00000) ? -1 : 4;
425 /* Exception order per the PRM (first has highest):
426 Inst Multiple CPLB Hits
427 Inst Misaligned Access
428 Inst Protection Violation
430 Only the alignment matters in non-OS mode though. */
432 _mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
434 SIM_DESC sd = CPU_STATE (cpu);
435 struct bfin_mmu *mmu;
436 bu32 *fault_status, *fault_addr, *mem_control, *cplb_addr, *cplb_data;
438 bool supv, do_excp, dag1;
441 supv = cec_is_supervisor_mode (cpu);
442 dag1 = (BFIN_CPU_STATE.multi_pc == PCREG + 6);
444 if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT || bfin_mmu_skip_cplbs)
446 int ret = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
447 /* Valid hits and misses are OK in non-OS envs. */
450 _mmu_process_fault (cpu, NULL, addr, write, inst, (ret == 3), false, supv, dag1);
453 mmu = MMU_STATE (cpu);
454 fault_status = inst ? &mmu->icplb_fault_status : &mmu->dcplb_fault_status;
455 fault_addr = inst ? &mmu->icplb_fault_addr : &mmu->dcplb_fault_addr;
456 mem_control = inst ? &mmu->imem_control : &mmu->dmem_control;
457 cplb_addr = inst ? &mmu->icplb_addr[0] : &mmu->dcplb_addr[0];
458 cplb_data = inst ? &mmu->icplb_data[0] : &mmu->dcplb_data[0];
464 /* CPLBs disabled -> little to do. */
465 if (!(*mem_control & ENCPLB))
471 /* Check all the CPLBs first. */
472 for (i = 0; i < 16; ++i)
474 const bu32 pages[4] = { 0x400, 0x1000, 0x100000, 0x400000 };
475 bu32 addr_lo, addr_hi;
477 /* Skip invalid entries. */
478 if (!(cplb_data[i] & CPLB_VALID))
481 /* See if this entry covers this address. */
482 addr_lo = cplb_addr[i];
483 addr_hi = cplb_addr[i] + pages[(cplb_data[i] & PAGE_SIZE) >> 16];
484 if (addr < addr_lo || addr >= addr_hi)
491 if (!supv && !(cplb_data[i] & CPLB_USER_WR))
493 if (supv && !(cplb_data[i] & CPLB_SUPV_WR))
495 if ((cplb_data[i] & (CPLB_WT | CPLB_L1_CHBL | CPLB_DIRTY)) == CPLB_L1_CHBL)
500 if (!supv && !(cplb_data[i] & CPLB_USER_RD))
505 /* Handle default/implicit CPLBs. */
506 if (!do_excp && hits < 2)
510 ihits = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
513 /* No faults and one match -> good to go. */
520 cec_hwerr (cpu, HWERR_EXTERN_ADDR);
527 /* Normalize hit count so hits==2 is always multiple hit exception. */
528 hits = MIN (2, hits);
530 _mmu_log_fault (cpu, mmu, addr, write, inst, hits == 0, supv, dag1, faults);
534 int iexcps[] = { VEC_CPLB_I_M, VEC_CPLB_I_VL, VEC_CPLB_I_MHIT, VEC_MISALI_I };
539 int dexcps[] = { VEC_CPLB_M, VEC_CPLB_VL, VEC_CPLB_MHIT, VEC_MISALI_D };
545 mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
547 int excp = _mmu_check_addr (cpu, addr, write, inst, size);
549 cec_exception (cpu, excp);
553 mmu_check_cache_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst)
558 cacheaddr = addr & ~(BFIN_L1_CACHE_BYTES - 1);
559 excp = _mmu_check_addr (cpu, cacheaddr, write, inst, BFIN_L1_CACHE_BYTES);
563 /* Most exceptions are ignored with cache funcs. */
564 /* XXX: Not sure if we should be ignoring CPLB misses. */
567 if (excp == VEC_CPLB_I_VL)
572 if (excp == VEC_CPLB_VL)
575 cec_exception (cpu, excp);