src/ds/ds.c (view raw)
1/* Copyright (c) 2013-2016 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include <mgba/internal/ds/ds.h>
7
8#include <mgba/core/interface.h>
9#include <mgba/internal/arm/decoder.h>
10#include <mgba/internal/arm/debugger/debugger.h>
11#include <mgba/internal/arm/isa-inlines.h>
12#include <mgba/internal/ds/bios.h>
13
14#include <mgba-util/crc32.h>
15#include <mgba-util/memory.h>
16#include <mgba-util/math.h>
17#include <mgba-util/vfs.h>
18
19#define SLICE_CYCLES 2048
20
21mLOG_DEFINE_CATEGORY(DS, "DS", "ds");
22
23const uint32_t DS_ARM946ES_FREQUENCY = 0x1FF61FE;
24const uint32_t DS_ARM7TDMI_FREQUENCY = 0xFFB0FF;
25const uint32_t DS_COMPONENT_MAGIC = 0x1FF61FE;
26const uint8_t DS_CHIP_ID[4] = { 0xC2, 0x0F, 0x00, 0x00 };
27
28static const size_t DS_ROM_MAGIC_OFFSET = 0x15C;
29static const uint8_t DS_ROM_MAGIC[] = { 0x56, 0xCF };
30static const uint8_t DS_ROM_MAGIC_2[] = { 0x1A, 0x9E };
31
32static const size_t DS_FIRMWARE_MAGIC_OFFSET = 0x8;
33static const uint8_t DS_FIRMWARE_MAGIC[] = { 0x4D, 0x41, 0x43 };
34
35enum {
36 DS7_SP_BASE = 0x380FD80,
37 DS7_SP_BASE_IRQ = 0x380FF80,
38 DS7_SP_BASE_SVC = 0x380FFC0,
39
40 DS9_SP_BASE = 0x3002F7C,
41 DS9_SP_BASE_IRQ = 0x3003F80,
42 DS9_SP_BASE_SVC = 0x3003FC0,
43};
44
45static void DSInit(void* cpu, struct mCPUComponent* component);
46
47static void DS7Reset(struct ARMCore* cpu);
48static void DS7TestIRQ(struct ARMCore* cpu);
49static void DS7InterruptHandlerInit(struct ARMInterruptHandler* irqh);
50static void DS7ProcessEvents(struct ARMCore* cpu);
51
52static void DS9Reset(struct ARMCore* cpu);
53static void DS9TestIRQ(struct ARMCore* cpu);
54static void DS9WriteCP15(struct ARMCore* cpu, int crn, int crm, int opcode1, int opcode2, uint32_t value);
55static uint32_t DS9ReadCP15(struct ARMCore* cpu, int crn, int crm, int opcode1, int opcode2);
56static void DS9InterruptHandlerInit(struct ARMInterruptHandler* irqh);
57static void DS9ProcessEvents(struct ARMCore* cpu);
58
59static void DSProcessEvents(struct DSCommon* dscore);
60static void DSHitStub(struct ARMCore* cpu, uint32_t opcode);
61static void DSIllegal(struct ARMCore* cpu, uint32_t opcode);
62static void DSBreakpoint(struct ARMCore* cpu, int immediate);
63
64static void _slice(struct mTiming* timing, void* context, uint32_t cyclesLate) {
65 UNUSED(cyclesLate);
66 struct DS* ds = context;
67 uint32_t cycles = mTimingCurrentTime(timing) - ds->sliceStart;
68 if (ds->activeCpu == ds->ds9.cpu) {
69 ds->activeCpu = ds->ds7.cpu;
70 ds->cycleDrift += cycles;
71 cycles = ds->cycleDrift >> 1;
72 timing = &ds->ds7.timing;
73 } else {
74 ds->activeCpu = ds->ds9.cpu;
75 ds->cycleDrift -= cycles << 1;
76 cycles = ds->cycleDrift + SLICE_CYCLES;
77 timing = &ds->ds9.timing;
78 }
79 mTimingSchedule(timing, &ds->slice, cycles);
80 ds->sliceStart = mTimingCurrentTime(timing);
81 ds->earlyExit = true;
82}
83
84static void _divide(struct mTiming* timing, void* context, uint32_t cyclesLate) {
85 UNUSED(timing);
86 UNUSED(cyclesLate);
87 struct DS* ds = context;
88 ds->memory.io9[DS9_REG_DIVCNT >> 1] &= ~0x8000;
89 int64_t numerator;
90 int64_t denominator;
91 LOAD_64LE(numerator, DS9_REG_DIV_NUMER_0, ds->memory.io9);
92 LOAD_64LE(denominator, DS9_REG_DIV_DENOM_0, ds->memory.io9);
93 bool max = false;
94 switch (ds->memory.io9[DS9_REG_DIVCNT >> 1] & 0x3) {
95 case 0:
96 numerator = (int64_t)(int32_t) numerator;
97 case 1:
98 case 3:
99 denominator = (int64_t)(int32_t) denominator;
100 break;
101 }
102 if (numerator == INT64_MIN) {
103 max = true;
104 }
105 if (!denominator) {
106 ds->memory.io9[DS9_REG_DIVCNT >> 1] |= 0x4000;
107 STORE_64LE(numerator, DS9_REG_DIVREM_RESULT_0, ds->memory.io9);
108 numerator >>= 63LL;
109 numerator = -numerator;
110 STORE_64LE(numerator, DS9_REG_DIV_RESULT_0, ds->memory.io9);
111 return;
112 }
113 if (denominator == -1LL && max) {
114 ds->memory.io9[DS9_REG_DIVCNT >> 1] |= 0x4000;
115 STORE_64LE(numerator, DS9_REG_DIV_RESULT_0, ds->memory.io9);
116 return;
117 }
118 ds->memory.io9[DS9_REG_DIVCNT >> 1] &= ~0x4000;
119 int64_t result = numerator / denominator;
120 int64_t remainder = numerator % denominator; // TODO: defined behavior for negative denominator?
121 STORE_64LE(result, DS9_REG_DIV_RESULT_0, ds->memory.io9);
122 STORE_64LE(remainder, DS9_REG_DIVREM_RESULT_0, ds->memory.io9);
123}
124
125static void _sqrt(struct mTiming* timing, void* context, uint32_t cyclesLate) {
126 UNUSED(timing);
127 UNUSED(cyclesLate);
128 struct DS* ds = context;
129 ds->memory.io9[DS9_REG_SQRTCNT >> 1] &= ~0x8000;
130 uint64_t param;
131 LOAD_64LE(param, DS9_REG_SQRT_PARAM_0, ds->memory.io9);
132 if (!(ds->memory.io9[DS9_REG_SQRTCNT >> 1] & 1)) {
133 param &= 0xFFFFFFFFULL;
134 }
135
136 uint64_t result = 0;
137 uint64_t bit = 0x4000000000000000ULL; // The second-to-top bit is set: 1 << 30 for 32 bits
138
139 // "bit" starts at the highest power of four <= the argument.
140 while (bit > param) {
141 bit >>= 2;
142 }
143
144 while (bit != 0) {
145 if (param >= result + bit) {
146 param -= result + bit;
147 result = (result >> 1) + bit;
148 } else {
149 result >>= 1;
150 }
151 bit >>= 2;
152 }
153 STORE_32LE(result, DS9_REG_SQRT_RESULT_LO, ds->memory.io9);
154}
155
156void DSCreate(struct DS* ds) {
157 ds->d.id = DS_COMPONENT_MAGIC;
158 ds->d.init = DSInit;
159 ds->d.deinit = NULL;
160 ds->ds7.p = ds;
161 ds->ds9.p = ds;
162 ds->ds7.cpu = NULL;
163 ds->ds9.cpu = NULL;
164 ds->ds7.ipc = &ds->ds9;
165 ds->ds9.ipc = &ds->ds7;
166}
167
168static void DSInit(void* cpu, struct mCPUComponent* component) {
169 struct DS* ds = (struct DS*) component;
170 struct ARMCore* core = cpu;
171 if (!ds->ds7.cpu) {
172 // The ARM7 must get initialized first
173 ds->ds7.cpu = core;
174 ds->debugger = 0;
175 ds->sync = 0;
176 return;
177 }
178 ds->ds9.cpu = cpu;
179 ds->activeCpu = NULL;
180
181 ds->ds9.cpu->cp15.r1.c0 = ARMControlRegFillVE(0);
182
183 ds->slice.name = "DS CPU Time Slicing";
184 ds->slice.callback = _slice;
185 ds->slice.context = ds;
186 ds->slice.priority = UINT_MAX;
187
188 CircleBufferInit(&ds->ds7.fifo, 64);
189 CircleBufferInit(&ds->ds9.fifo, 64);
190
191 DS7InterruptHandlerInit(&ds->ds7.cpu->irqh);
192 DS9InterruptHandlerInit(&ds->ds9.cpu->irqh);
193 DSMemoryInit(ds);
194 DSDMAInit(ds);
195
196 DSVideoInit(&ds->video);
197 ds->video.p = ds;
198
199 DSGXInit(&ds->gx);
200 ds->gx.p = ds;
201
202 DSAudioInit(&ds->audio, 2048);
203 ds->audio.p = ds;
204
205 ds->ds7.springIRQ = 0;
206 ds->ds9.springIRQ = 0;
207 DSTimerInit(ds);
208 ds->keySource = NULL;
209 ds->rtcSource = NULL;
210 ds->rumble = NULL;
211
212 ds->romVf = NULL;
213 DSSlot1SPIInit(ds, NULL);
214
215 ds->stream = NULL;
216 ds->keyCallback = NULL;
217 mCoreCallbacksListInit(&ds->coreCallbacks, 0);
218
219 ds->divEvent.name = "DS Hardware Divide";
220 ds->divEvent.callback = _divide;
221 ds->divEvent.context = ds;
222 ds->divEvent.priority = 0x50;
223
224 ds->sqrtEvent.name = "DS Hardware Sqrt";
225 ds->sqrtEvent.callback = _sqrt;
226 ds->sqrtEvent.context = ds;
227 ds->sqrtEvent.priority = 0x51;
228
229 mTimingInit(&ds->ds7.timing, &ds->ds7.cpu->cycles, &ds->ds7.cpu->nextEvent);
230 mTimingInit(&ds->ds9.timing, &ds->ds9.cpu->cycles, &ds->ds9.cpu->nextEvent);
231}
232
233void DSUnloadROM(struct DS* ds) {
234 if (ds->romVf) {
235 ds->romVf->close(ds->romVf);
236 ds->romVf = NULL;
237 }
238}
239
240void DSDestroy(struct DS* ds) {
241 CircleBufferDeinit(&ds->ds7.fifo);
242 CircleBufferDeinit(&ds->ds9.fifo);
243 DSUnloadROM(ds);
244 DSMemoryDeinit(ds);
245 DSGXDeinit(&ds->gx);
246 DSAudioDeinit(&ds->audio);
247 mTimingDeinit(&ds->ds7.timing);
248 mTimingDeinit(&ds->ds9.timing);
249 mCoreCallbacksListDeinit(&ds->coreCallbacks);
250}
251
252void DS7InterruptHandlerInit(struct ARMInterruptHandler* irqh) {
253 irqh->reset = DS7Reset;
254 irqh->processEvents = DS7ProcessEvents;
255 irqh->swi16 = DS7Swi16;
256 irqh->swi32 = DS7Swi32;
257 irqh->hitIllegal = DSIllegal;
258 irqh->readCPSR = DS7TestIRQ;
259 irqh->writeCP15 = NULL;
260 irqh->readCP15 = NULL;
261 irqh->hitStub = DSHitStub;
262 irqh->bkpt16 = DSBreakpoint;
263 irqh->bkpt32 = DSBreakpoint;
264}
265
266void DS9InterruptHandlerInit(struct ARMInterruptHandler* irqh) {
267 irqh->reset = DS9Reset;
268 irqh->processEvents = DS9ProcessEvents;
269 irqh->swi16 = DS9Swi16;
270 irqh->swi32 = DS9Swi32;
271 irqh->hitIllegal = DSIllegal;
272 irqh->readCPSR = DS9TestIRQ;
273 irqh->writeCP15 = DS9WriteCP15;
274 irqh->readCP15 = DS9ReadCP15;
275 irqh->hitStub = DSHitStub;
276 irqh->bkpt16 = DSBreakpoint;
277 irqh->bkpt32 = DSBreakpoint;
278}
279
280void DS7Reset(struct ARMCore* cpu) {
281 ARMSetPrivilegeMode(cpu, MODE_IRQ);
282 cpu->gprs[ARM_SP] = DS7_SP_BASE_IRQ;
283 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
284 cpu->gprs[ARM_SP] = DS7_SP_BASE_SVC;
285 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
286 cpu->gprs[ARM_SP] = DS7_SP_BASE;
287
288 struct DS* ds = (struct DS*) cpu->master;
289 mTimingClear(&ds->ds7.timing);
290 CircleBufferInit(&ds->ds7.fifo, 64);
291 DSMemoryReset(ds);
292 DSDMAReset(&ds->ds7);
293 DSAudioReset(&ds->audio);
294 DS7IOInit(ds);
295
296 DSConfigureWRAM(&ds->memory, 3);
297
298 struct DSCartridge* header = ds->romVf->map(ds->romVf, sizeof(*header), MAP_READ);
299 if (header) {
300 memcpy(&ds->memory.ram[0x3FF800 >> 2], DS_CHIP_ID, 4);
301 memcpy(&ds->memory.ram[0x3FF804 >> 2], DS_CHIP_ID, 4);
302 memcpy(&ds->memory.ram[0x3FFC00 >> 2], DS_CHIP_ID, 4);
303 memcpy(&ds->memory.ram[0x3FFC04 >> 2], DS_CHIP_ID, 4);
304 memcpy(&ds->memory.ram[0x3FFE00 >> 2], header, 0x170);
305 DS7IOWrite32(ds, DS_REG_ROMCNT_LO, header->busTiming | 0x2700000);
306 // TODO: Error check
307 ds->romVf->seek(ds->romVf, header->arm7Offset, SEEK_SET);
308 uint32_t base = header->arm7Base;
309 if (base >> DS_BASE_OFFSET == DS_REGION_RAM) {
310 base -= DS_BASE_RAM;
311 uint32_t* basePointer = &ds->memory.ram[base >> 2];
312 if (base < DS_SIZE_RAM && base + header->arm7Size <= DS_SIZE_RAM) {
313 ds->romVf->read(ds->romVf, basePointer, header->arm7Size);
314 }
315 } else {
316 uint32_t size;
317 for (size = header->arm7Size; size; --size) {
318 uint8_t b = 0;
319 ds->romVf->read(ds->romVf, &b, 1);
320 cpu->memory.store8(cpu, base, b, NULL);
321 ++base;
322 }
323 }
324 cpu->gprs[12] = header->arm7Entry;
325 cpu->gprs[ARM_LR] = header->arm7Entry;
326 cpu->gprs[ARM_PC] = header->arm7Entry;
327 int currentCycles = 0;
328 ARM_WRITE_PC;
329
330 ds->romVf->unmap(ds->romVf, header, sizeof(*header));
331 }
332}
333
334void DS9Reset(struct ARMCore* cpu) {
335 ARMSetPrivilegeMode(cpu, MODE_IRQ);
336 cpu->gprs[ARM_SP] = DS9_SP_BASE_IRQ;
337 ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
338 cpu->gprs[ARM_SP] = DS9_SP_BASE_SVC;
339 ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
340 cpu->gprs[ARM_SP] = DS9_SP_BASE;
341
342 struct DS* ds = (struct DS*) cpu->master;
343 mTimingClear(&ds->ds9.timing);
344 CircleBufferInit(&ds->ds9.fifo, 64);
345 DSVideoReset(&ds->video);
346 DSGXReset(&ds->gx);
347 DSDMAReset(&ds->ds9);
348 DS9IOInit(ds);
349
350 ds->activeCpu = cpu;
351 mTimingSchedule(&ds->ds9.timing, &ds->slice, SLICE_CYCLES);
352 ds->cycleDrift = 0;
353 ds->sliceStart = mTimingCurrentTime(&ds->ds9.timing);
354
355 struct DSCartridge* header = ds->romVf->map(ds->romVf, sizeof(*header), MAP_READ);
356 if (header) {
357 // TODO: Error check
358 ds->romVf->seek(ds->romVf, header->arm9Offset, SEEK_SET);
359 uint32_t base = header->arm9Base - DS_BASE_RAM;
360 uint32_t* basePointer = &ds->memory.ram[base >> 2];
361 if (base < DS_SIZE_RAM && base + header->arm9Size <= DS_SIZE_RAM) {
362 ds->romVf->read(ds->romVf, basePointer, header->arm9Size);
363 }
364 cpu->gprs[12] = header->arm9Entry;
365 cpu->gprs[ARM_LR] = header->arm9Entry;
366 cpu->gprs[ARM_PC] = header->arm9Entry;
367 int currentCycles = 0;
368 ARM_WRITE_PC;
369
370 ds->romVf->unmap(ds->romVf, header, sizeof(*header));
371 }
372}
373
374static void DS7ProcessEvents(struct ARMCore* cpu) {
375 struct DS* ds = (struct DS*) cpu->master;
376 DSProcessEvents(&ds->ds7);
377}
378
379static void DS9ProcessEvents(struct ARMCore* cpu) {
380 struct DS* ds = (struct DS*) cpu->master;
381 DSProcessEvents(&ds->ds9);
382}
383
384static void DSProcessEvents(struct DSCommon* dscore) {
385 struct ARMCore* cpu = dscore->cpu;
386 struct DS* ds = dscore->p;
387 if (dscore->springIRQ && !cpu->cpsr.i) {
388 ARMRaiseIRQ(cpu);
389 dscore->springIRQ = 0;
390 }
391
392 int32_t nextEvent = cpu->nextEvent;
393 while (cpu->cycles >= nextEvent) {
394 int32_t cycles = cpu->cycles;
395
396 cpu->cycles = 0;
397 cpu->nextEvent = 0;
398
399#ifndef NDEBUG
400 if (cycles < 0) {
401 mLOG(DS, FATAL, "Negative cycles passed: %i", cycles);
402 }
403#endif
404 nextEvent = cycles;
405 do {
406 nextEvent = mTimingTick(&dscore->timing, nextEvent);
407 } while (ds->cpuBlocked && !ds->earlyExit);
408
409 if (ds->earlyExit) {
410 ds->earlyExit = false;
411 break;
412 }
413
414 cpu->nextEvent = nextEvent;
415 if (cpu->halted) {
416 cpu->cycles = nextEvent;
417 }
418#ifndef NDEBUG
419 else if (nextEvent < 0) {
420 mLOG(DS, FATAL, "Negative cycles will pass: %i", nextEvent);
421 }
422#endif
423 }
424}
425
426void DSRunLoop(struct DS* ds) {
427 if (ds->activeCpu == ds->ds9.cpu) {
428 ARMv5RunLoop(ds->ds9.cpu);
429 } else {
430 ARMv4RunLoop(ds->ds7.cpu);
431 }
432}
433
434void DS7Step(struct DS* ds) {
435 int32_t pc = ds->ds7.cpu->gprs[ARM_PC];
436 do {
437 while (ds->activeCpu == ds->ds9.cpu) {
438 ARMv5RunLoop(ds->ds9.cpu);
439 }
440 ARMv4Run(ds->ds7.cpu);
441 } while (ds->ds7.cpu->halted || ds->ds7.cpu->gprs[ARM_PC] == pc);
442}
443
444void DS9Step(struct DS* ds) {
445 int32_t pc = ds->ds9.cpu->gprs[ARM_PC];
446 do {
447 while (ds->activeCpu == ds->ds7.cpu) {
448 ARMv4RunLoop(ds->ds7.cpu);
449 }
450 ARMv5Run(ds->ds9.cpu);
451 } while (ds->ds9.cpu->halted || ds->ds9.cpu->gprs[ARM_PC] == pc);
452}
453
454void DSAttachDebugger(struct DS* ds, struct mDebugger* debugger) {
455 ds->debugger = (struct ARMDebugger*) debugger->platform;
456 ds->ds7.cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
457 ds->ds9.cpu->components[CPU_COMPONENT_DEBUGGER] = &debugger->d;
458 ARMHotplugAttach(ds->ds7.cpu, CPU_COMPONENT_DEBUGGER);
459 ARMHotplugAttach(ds->ds9.cpu, CPU_COMPONENT_DEBUGGER);
460}
461
462void DSDetachDebugger(struct DS* ds) {
463 ds->debugger = NULL;
464 ARMHotplugDetach(ds->ds7.cpu, CPU_COMPONENT_DEBUGGER);
465 ARMHotplugDetach(ds->ds9.cpu, CPU_COMPONENT_DEBUGGER);
466 ds->ds7.cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
467 ds->ds9.cpu->components[CPU_COMPONENT_DEBUGGER] = NULL;
468}
469
470bool DSLoadROM(struct DS* ds, struct VFile* vf) {
471 DSUnloadROM(ds);
472 ds->romVf = vf;
473 // TODO: error check
474 return true;
475}
476
477bool DSLoadSave(struct DS* ds, struct VFile* sav) {
478 DSSlot1SPIInit(ds, sav);
479 return true;
480}
481
482bool DSIsROM(struct VFile* vf) {
483 if (vf->seek(vf, DS_ROM_MAGIC_OFFSET, SEEK_SET) < 0) {
484 return false;
485 }
486 uint8_t signature[sizeof(DS_ROM_MAGIC)];
487 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
488 return false;
489 }
490 return memcmp(signature, DS_ROM_MAGIC, sizeof(signature)) == 0 || memcmp(signature, DS_ROM_MAGIC_2, sizeof(signature)) == 0;
491}
492
493bool DSIsBIOS7(struct VFile* vf) {
494 size_t size = vf->size(vf);
495 void* data = NULL;
496 uint32_t crc;
497 if (size == DS7_SIZE_BIOS) {
498 data = vf->map(vf, size, MAP_READ);
499 }
500 if (!data) {
501 return false;
502 }
503 crc = doCrc32(data, size);
504 vf->unmap(vf, data, size);
505 return crc == DS7_BIOS_CHECKSUM;
506}
507
508bool DSIsBIOS9(struct VFile* vf) {
509 size_t size = vf->size(vf);
510 void* data = NULL;
511 uint32_t crc;
512 if (size == DS9_SIZE_BIOS) {
513 data = vf->map(vf, 0x1000, MAP_READ);
514 } else if (size == 0x1000) {
515 data = vf->map(vf, 0x1000, MAP_READ);
516 }
517 if (!data) {
518 return false;
519 }
520 crc = doCrc32(data, 0x1000);
521 vf->unmap(vf, data, 0x1000);
522 return crc == DS9_BIOS_CHECKSUM;
523}
524
525bool DSIsFirmware(struct VFile* vf) {
526 if (vf->seek(vf, DS_FIRMWARE_MAGIC_OFFSET, SEEK_SET) < 0) {
527 return false;
528 }
529 uint8_t signature[sizeof(DS_FIRMWARE_MAGIC)];
530 if (vf->read(vf, &signature, sizeof(signature)) != sizeof(signature)) {
531 return false;
532 }
533 return memcmp(signature, DS_FIRMWARE_MAGIC, sizeof(signature)) == 0;
534}
535
536bool DSLoadBIOS(struct DS* ds, struct VFile* vf) {
537 size_t size = vf->size(vf);
538 void* data = NULL;
539 uint32_t crc;
540 if (size == DS7_SIZE_BIOS) {
541 data = vf->map(vf, size, MAP_READ);
542 } else if (size == 0x1000) {
543 data = calloc(DS9_SIZE_BIOS, 1);
544 vf->read(vf, data, size);
545 } else if (size == DS9_SIZE_BIOS) {
546 data = vf->map(vf, size, MAP_READ);
547 } else if (size == DS_SIZE_FIRMWARE) {
548 return DSLoadFirmware(ds, vf);
549 }
550 if (!data) {
551 return false;
552 }
553 crc = doCrc32(data, size);
554 if (crc == DS7_BIOS_CHECKSUM) {
555 ds->bios7Vf = vf;
556 ds->memory.bios7 = data;
557 mLOG(DS, INFO, "Official DS ARM7 BIOS detected");
558 } else if (crc == DS9_BIOS_CHECKSUM) {
559 ds->bios9Vf = vf;
560 ds->memory.bios9 = data;
561 mLOG(DS, INFO, "Official DS ARM9 BIOS detected");
562 } else {
563 mLOG(DS, WARN, "BIOS checksum incorrect");
564 vf->unmap(vf, data, size);
565 return false;
566 }
567 return true;
568}
569
570bool DSLoadFirmware(struct DS* ds, struct VFile* vf) {
571 size_t size = vf->size(vf);
572 void* data = NULL;
573 if (!DSIsFirmware(vf)) {
574 return false;
575 }
576 if (size != DS_SIZE_FIRMWARE) {
577 return false;
578 }
579 mLOG(DS, INFO, "Found DS firmware");
580 ds->firmwareVf = vf;
581 return true;
582}
583
584void DSGetGameCode(struct DS* ds, char* out) {
585 memset(out, 0, 8);
586 if (!ds->romVf) {
587 return;
588 }
589
590 struct DSCartridge* cart = ds->romVf->map(ds->romVf, sizeof(*cart), MAP_READ);
591 // TODO: TWL-?
592 memcpy(out, "NTR-", 4);
593 memcpy(&out[4], &cart->id, 4);
594 ds->romVf->unmap(ds->romVf, cart, sizeof(*cart));
595}
596
597void DSGetGameTitle(struct DS* ds, char* out) {
598 memset(out, 0, 12);
599 if (!ds->romVf) {
600 return;
601 }
602
603 struct DSCartridge* cart = ds->romVf->map(ds->romVf, sizeof(*cart), MAP_READ);
604 memcpy(out, &cart->title, 12);
605 ds->romVf->unmap(ds->romVf, cart, sizeof(*cart));
606}
607
608void DSHitStub(struct ARMCore* cpu, uint32_t opcode) {
609 struct DS* ds = (struct DS*) cpu->master;
610 if (ds->debugger) {
611 struct mDebuggerEntryInfo info = {
612 .address = _ARMPCAddress(cpu),
613 .opcode = opcode
614 };
615 mDebuggerEnter(ds->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
616 }
617 // TODO: More sensible category?
618 mLOG(DS, ERROR, "Stub opcode: %08x", opcode);
619}
620
621void DSIllegal(struct ARMCore* cpu, uint32_t opcode) {
622 struct DS* ds = (struct DS*) cpu->master;
623 if ((opcode & 0xFFFF) == (redzoneInstruction & 0xFFFF)) {
624 int currentCycles = 0;
625 if (cpu->executionMode == MODE_THUMB) {
626 cpu->gprs[ARM_PC] -= WORD_SIZE_THUMB * 2;
627 THUMB_WRITE_PC;
628 } else {
629 cpu->gprs[ARM_PC] -= WORD_SIZE_ARM * 2;
630 ARM_WRITE_PC;
631 }
632 } else if (ds->debugger) {
633 struct mDebuggerEntryInfo info = {
634 .address = _ARMPCAddress(cpu),
635 .opcode = opcode
636 };
637 mDebuggerEnter(ds->debugger->d.p, DEBUGGER_ENTER_ILLEGAL_OP, &info);
638 } else {
639 ARMRaiseUndefined(cpu);
640 }
641}
642
643void DSBreakpoint(struct ARMCore* cpu, int immediate) {
644 struct DS* ds = (struct DS*) cpu->master;
645 if (immediate >= CPU_COMPONENT_MAX) {
646 return;
647 }
648 switch (immediate) {
649 case CPU_COMPONENT_DEBUGGER:
650 if (ds->debugger) {
651 struct mDebuggerEntryInfo info = {
652 .address = _ARMPCAddress(cpu)
653 };
654 mDebuggerEnter(ds->debugger->d.p, DEBUGGER_ENTER_BREAKPOINT, &info);
655 }
656 break;
657 default:
658 break;
659 }
660}
661
662void DS7TestIRQ(struct ARMCore* cpu) {
663 struct DS* ds = (struct DS*) cpu->master;
664 if (!ds->memory.io7[DS_REG_IME >> 1]) {
665 return;
666 }
667 uint32_t test = (ds->memory.io7[DS_REG_IE_LO >> 1] & ds->memory.io7[DS_REG_IF_LO >> 1]);
668 test |= (ds->memory.io7[DS_REG_IE_HI >> 1] & ds->memory.io7[DS_REG_IF_HI >> 1]) << 16;
669 if (test) {
670 ds->ds7.springIRQ = test;
671 cpu->nextEvent = cpu->cycles;
672 }
673}
674
675void DS9TestIRQ(struct ARMCore* cpu) {
676 struct DS* ds = (struct DS*) cpu->master;
677 if (!ds->memory.io9[DS_REG_IME >> 1]) {
678 return;
679 }
680 uint32_t test = (ds->memory.io9[DS_REG_IE_LO >> 1] & ds->memory.io9[DS_REG_IF_LO >> 1]);
681 test |= (ds->memory.io9[DS_REG_IE_HI >> 1] & ds->memory.io9[DS_REG_IF_HI >> 1]) << 16;
682 if (test) {
683 ds->ds9.springIRQ = test;
684 cpu->nextEvent = cpu->cycles;
685 }
686}
687
688static void _writeSysControl(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
689 mLOG(DS, STUB, "CP15 system control write: CRm: %i, Op2: %i, Value: 0x%08X", crm, opcode2, value);
690}
691
692static void _writeCacheControl(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
693 mLOG(DS, STUB, "CP15 cache control control write: CRm: %i, Op2: %i, Value: 0x%08X", crm, opcode2, value);
694 switch (opcode2) {
695 case 0:
696 cpu->cp15.r2.d = value;
697 break;
698 case 1:
699 cpu->cp15.r2.i = value;
700 break;
701 default:
702 mLOG(DS, GAME_ERROR, "CP15 cache control control bad op2: %i", opcode2);
703 break;
704 }
705}
706
707static void _writeWriteBufferControl(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
708 mLOG(DS, STUB, "CP15 write buffer control write: CRm: %i, Op2: %i, Value: 0x%08X", crm, opcode2, value);
709 switch (opcode2) {
710 case 0:
711 cpu->cp15.r3.d = value;
712 break;
713 default:
714 mLOG(DS, GAME_ERROR, "CP15 cache control control bad op2: %i", opcode2);
715 break;
716 }
717}
718
719static void _writeAccessControl(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
720 mLOG(DS, STUB, "CP15 access control write: CRm: %i, Op2: %i, Value: 0x%08X", crm, opcode2, value);
721}
722
723static void _writeRegionConfiguration(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
724 cpu->cp15.r6.region[crm] = value;
725 uint32_t base = ARMProtectionGetBase(value) << 12;
726 uint32_t size = 2 << ARMProtectionGetSize(value);
727 mLOG(DS, STUB, "CP15 region configuration write: Region: %i, Insn: %i, Base: %08X, Size: %08X", crm, opcode2, base, size);
728}
729
730static void _writeCache(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
731 switch (crm) {
732 case 0:
733 if (opcode2 == 4) {
734 ARMHalt(cpu);
735 return;
736 }
737 break;
738 }
739 mLOG(DS, STUB, "CP15 cache write: CRm: %i, Op2: %i, Value: 0x%08X", crm, opcode2, value);
740}
741
742static void _writeTCMControl(struct ARMCore* cpu, int crm, int opcode2, uint32_t value) {
743 uint32_t base = ARMTCMControlGetBase(value) << 12;
744 uint32_t size = 512 << ARMTCMControlGetVirtualSize(value);
745 struct DS* ds = (struct DS*) cpu->master;
746 mLOG(DS, DEBUG, "CP15 TCM control write: CRm: %i, Op2: %i, Base: %08X, Size: %08X", crm, opcode2, base, size);
747 switch (opcode2) {
748 case 0:
749 cpu->cp15.r9.d = value;
750 ds->memory.dtcmBase = base;
751 ds->memory.dtcmSize = size;
752 break;
753 case 1:
754 cpu->cp15.r9.i = value;
755 ds->memory.itcmSize = size;
756 break;
757 default:
758 mLOG(DS, GAME_ERROR, "CP15 TCM control bad op2: %i", opcode2);
759 break;
760 }
761}
762
763void DS9WriteCP15(struct ARMCore* cpu, int crn, int crm, int opcode1, int opcode2, uint32_t value) {
764 switch (crn) {
765 default:
766 mLOG(DS, STUB, "CP15 unknown write: CRn: %i, CRm: %i, Op1: %i, Op2: %i, Value: 0x%08X", crn, crm, opcode1, opcode2, value);
767 break;
768 case 0:
769 mLOG(DS, GAME_ERROR, "Attempted to write to read-only cp15 register");
770 ARMRaiseUndefined(cpu);
771 break;
772 case 1:
773 _writeSysControl(cpu, crm, opcode2, value);
774 break;
775 case 2:
776 _writeCacheControl(cpu, crm, opcode2, value);
777 break;
778 case 3:
779 _writeWriteBufferControl(cpu, crm, opcode2, value);
780 break;
781 case 5:
782 _writeAccessControl(cpu, crm, opcode2, value);
783 break;
784 case 6:
785 _writeRegionConfiguration(cpu, crm, opcode2, value);
786 break;
787 case 7:
788 _writeCache(cpu, crm, opcode2, value);
789 break;
790 case 9:
791 _writeTCMControl(cpu, crm, opcode2, value);
792 break;
793 }
794}
795
796static uint32_t _readTCMControl(struct ARMCore* cpu, int crm, int opcode2) {
797 switch (opcode2) {
798 case 0:
799 return cpu->cp15.r9.d;
800 case 1:
801 return cpu->cp15.r9.i;
802 default:
803 mLOG(DS, GAME_ERROR, "CP15 TCM control bad op2: %i", opcode2);
804 return 0;
805 }
806}
807
808uint32_t DS9ReadCP15(struct ARMCore* cpu, int crn, int crm, int opcode1, int opcode2) {
809 switch (crn) {
810 default:
811 mLOG(DS, STUB, "CP15 unknown read: CRn: %i, CRm: %i, Op1: %i, Op2: %i", crn, crm, opcode1, opcode2);
812 return 0;
813 case 9:
814 return _readTCMControl(cpu, crm, opcode2);
815 }
816}
817
818void DSWriteIE(struct ARMCore* cpu, uint16_t* io, uint32_t value) {
819 if (io[DS_REG_IME >> 1] && (value & io[DS_REG_IF_LO >> 1] || (value >> 16) & io[DS_REG_IF_HI >> 1])) {
820 ARMRaiseIRQ(cpu);
821 }
822}
823void DSWriteIME(struct ARMCore* cpu, uint16_t* io, uint16_t value) {
824 if (value && (io[DS_REG_IE_LO >> 1] & io[DS_REG_IF_LO >> 1] || io[DS_REG_IE_HI >> 1] & io[DS_REG_IF_HI >> 1])) {
825 ARMRaiseIRQ(cpu);
826 }
827}
828
829void DSRaiseIRQ(struct ARMCore* cpu, uint16_t* io, enum DSIRQ irq) {
830 if (irq < 16) {
831 io[DS_REG_IF_LO >> 1] |= 1 << irq;
832 } else {
833 io[DS_REG_IF_HI >> 1] |= 1 << (irq - 16);
834 }
835
836 if ((irq < 16 && (io[DS_REG_IE_LO >> 1] & 1 << irq)) || (io[DS_REG_IE_HI >> 1] & (1 << (irq - 16)))) {
837 cpu->halted = 0;
838 if (io[DS_REG_IME >> 1]) {
839 ARMRaiseIRQ(cpu);
840 }
841 }
842}
843
844void DSFrameStarted(struct DS* ds) {
845 size_t c;
846 for (c = 0; c < mCoreCallbacksListSize(&ds->coreCallbacks); ++c) {
847 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&ds->coreCallbacks, c);
848 if (callbacks->videoFrameStarted) {
849 callbacks->videoFrameStarted(callbacks->context);
850 }
851 }
852}
853
854void DSFrameEnded(struct DS* ds) {
855 size_t c;
856 for (c = 0; c < mCoreCallbacksListSize(&ds->coreCallbacks); ++c) {
857 struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&ds->coreCallbacks, c);
858 if (callbacks->videoFrameEnded) {
859 callbacks->videoFrameEnded(callbacks->context);
860 }
861 }
862
863 if (ds->stream && ds->stream->postVideoFrame) {
864 const color_t* pixels;
865 size_t stride;
866 ds->video.renderer->getPixels(ds->video.renderer, &stride, (const void**) &pixels);
867 ds->stream->postVideoFrame(ds->stream, pixels, stride);
868 }
869}
870
871uint16_t DSWriteRTC(struct DS* ds, DSRegisterRTC value) {
872 switch (ds->rtc.transferStep) {
873 case 0:
874 if ((value & 6) == 2) {
875 ds->rtc.transferStep = 1;
876 }
877 break;
878 case 1:
879 if ((value & 6) == 6) {
880 ds->rtc.transferStep = 2;
881 }
882 break;
883 case 2:
884 if (!DSRegisterRTCIsClock(value)) {
885 if (DSRegisterRTCIsDataDirection(value)) {
886 ds->rtc.bits &= ~(1 << ds->rtc.bitsRead);
887 ds->rtc.bits |= DSRegisterRTCGetData(value) << ds->rtc.bitsRead;
888 } else {
889 value = DSRegisterRTCSetData(value, GBARTCOutput(&ds->rtc));
890 }
891 } else {
892 if (DSRegisterRTCIsSelect(value)) {
893 // GPIO direction should always != reading
894 if (DSRegisterRTCIsDataDirection(value)) {
895 if (RTCCommandDataIsReading(ds->rtc.command)) {
896 mLOG(DS, GAME_ERROR, "Attempting to write to RTC while in read mode");
897 }
898 ++ds->rtc.bitsRead;
899 if (ds->rtc.bitsRead == 8) {
900 GBARTCProcessByte(&ds->rtc, ds->rtcSource);
901 }
902 } else {
903 value = DSRegisterRTCSetData(value, GBARTCOutput(&ds->rtc));
904 ++ds->rtc.bitsRead;
905 if (ds->rtc.bitsRead == 8) {
906 --ds->rtc.bytesRemaining;
907 if (ds->rtc.bytesRemaining <= 0) {
908 ds->rtc.commandActive = 0;
909 ds->rtc.command = RTCCommandDataClearReading(ds->rtc.command);
910 }
911 ds->rtc.bitsRead = 0;
912 }
913 }
914 } else {
915 ds->rtc.bitsRead = 0;
916 ds->rtc.bytesRemaining = 0;
917 ds->rtc.commandActive = 0;
918 ds->rtc.command = RTCCommandDataClearReading(ds->rtc.command);
919 ds->rtc.transferStep = 0;
920 }
921 }
922 break;
923 }
924 return value;
925}