mirror of https://github.com/mgba-emu/mgba.git
594 lines
16 KiB
C
594 lines
16 KiB
C
#include "gba.h"
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#include "gba-bios.h"
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#include "gba-io.h"
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#include "gba-thread.h"
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#include "memory.h"
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#include "debugger.h"
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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const uint32_t GBA_ARM7TDMI_FREQUENCY = 0x1000000;
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enum {
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SP_BASE_SYSTEM = 0x03FFFF00,
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SP_BASE_IRQ = 0x03FFFFA0,
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SP_BASE_SUPERVISOR = 0x03FFFFE0
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};
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struct GBACartridgeOverride {
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uint32_t id;
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enum SavedataType type;
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int gpio;
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};
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static const struct GBACartridgeOverride _overrides[] = {
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// Boktai: The Sun is in Your Hand
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{ 'EI3U', SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
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{ 'PI3U', SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
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// Boktai 2: Solar Boy Django
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{ 'E23U', SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
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{ 'P23U', SAVEDATA_EEPROM, GPIO_RTC | GPIO_LIGHT_SENSOR },
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// Drill Dozer
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{ 'J94V', SAVEDATA_SRAM, GPIO_RUMBLE },
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{ 'E94V', SAVEDATA_SRAM, GPIO_RUMBLE },
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// Pokemon Ruby
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{ 'JVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'EVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'PVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'IVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'SVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'DVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'FVXA', SAVEDATA_FLASH1M, GPIO_RTC },
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// Pokemon Sapphire
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{ 'JPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'EPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'PPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'IPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'SPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'DPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'FPXA', SAVEDATA_FLASH1M, GPIO_RTC },
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// Pokemon Emerald
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{ 'JEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'EEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'PEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'IEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'SEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'DEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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{ 'FEPB', SAVEDATA_FLASH1M, GPIO_RTC },
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// Pokemon FireRed
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{ 'JRPB', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'ERPB', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'PRPB', SAVEDATA_FLASH1M, GPIO_NONE },
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// Pokemon LeafGreen
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{ 'JGPB', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'EGPB', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'PGPB', SAVEDATA_FLASH1M, GPIO_NONE },
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// RockMan EXE 4.5 - Real Operation
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{ 'J4RB', SAVEDATA_FLASH512, GPIO_RTC },
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// Super Mario Advance 4
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{ 'J4XA', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'E4XA', SAVEDATA_FLASH1M, GPIO_NONE },
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{ 'P4XA', SAVEDATA_FLASH1M, GPIO_NONE },
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// Wario Ware Twisted
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{ 'JWZR', SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
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{ 'EWZR', SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
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{ 'PWZR', SAVEDATA_SRAM, GPIO_RUMBLE | GPIO_GYRO },
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{ 0, 0, 0 }
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};
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static void GBAProcessEvents(struct ARMBoard* board);
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static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles);
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static void GBAHitStub(struct ARMBoard* board, uint32_t opcode);
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static void GBAIllegal(struct ARMBoard* board, uint32_t opcode);
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static void _checkOverrides(struct GBA* gba, uint32_t code);
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void GBAInit(struct GBA* gba) {
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gba->debugger = 0;
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gba->savefile = 0;
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ARMInit(&gba->cpu);
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gba->memory.p = gba;
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GBAMemoryInit(&gba->memory);
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ARMAssociateMemory(&gba->cpu, &gba->memory.d);
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gba->board.p = gba;
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GBABoardInit(&gba->board);
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ARMAssociateBoard(&gba->cpu, &gba->board.d);
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gba->video.p = gba;
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GBAVideoInit(&gba->video);
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gba->audio.p = gba;
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GBAAudioInit(&gba->audio);
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GBAIOInit(gba);
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gba->timersEnabled = 0;
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memset(gba->timers, 0, sizeof(gba->timers));
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gba->springIRQ = 0;
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gba->keySource = 0;
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gba->rotationSource = 0;
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gba->rumble = 0;
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gba->logLevel = GBA_LOG_INFO | GBA_LOG_WARN | GBA_LOG_ERROR;
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gba->biosChecksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
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ARMReset(&gba->cpu);
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}
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void GBADeinit(struct GBA* gba) {
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GBAMemoryDeinit(&gba->memory);
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GBAVideoDeinit(&gba->video);
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GBAAudioDeinit(&gba->audio);
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}
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void GBABoardInit(struct GBABoard* board) {
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board->d.reset = GBABoardReset;
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board->d.processEvents = GBAProcessEvents;
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board->d.swi16 = GBASwi16;
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board->d.swi32 = GBASwi32;
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board->d.hitIllegal = GBAIllegal;
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board->d.readCPSR = GBATestIRQ;
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board->d.hitStub = GBAHitStub;
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}
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void GBABoardReset(struct ARMBoard* board) {
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struct ARMCore* cpu = board->cpu;
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ARMSetPrivilegeMode(cpu, MODE_IRQ);
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cpu->gprs[ARM_SP] = SP_BASE_IRQ;
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ARMSetPrivilegeMode(cpu, MODE_SUPERVISOR);
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cpu->gprs[ARM_SP] = SP_BASE_SUPERVISOR;
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ARMSetPrivilegeMode(cpu, MODE_SYSTEM);
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cpu->gprs[ARM_SP] = SP_BASE_SYSTEM;
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}
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static void GBAProcessEvents(struct ARMBoard* board) {
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do {
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struct GBABoard* gbaBoard = (struct GBABoard*) board;
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int32_t cycles = board->cpu->cycles;
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int32_t nextEvent = INT_MAX;
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int32_t testEvent;
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if (gbaBoard->p->springIRQ) {
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ARMRaiseIRQ(&gbaBoard->p->cpu);
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gbaBoard->p->springIRQ = 0;
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}
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testEvent = GBAVideoProcessEvents(&gbaBoard->p->video, cycles);
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if (testEvent < nextEvent) {
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nextEvent = testEvent;
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}
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testEvent = GBAAudioProcessEvents(&gbaBoard->p->audio, cycles);
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if (testEvent < nextEvent) {
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nextEvent = testEvent;
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}
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testEvent = GBATimersProcessEvents(gbaBoard->p, cycles);
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if (testEvent < nextEvent) {
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nextEvent = testEvent;
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}
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testEvent = GBAMemoryRunDMAs(&gbaBoard->p->memory, cycles);
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if (testEvent < nextEvent) {
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nextEvent = testEvent;
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}
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board->cpu->cycles -= cycles;
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board->cpu->nextEvent = nextEvent;
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} while (board->cpu->cycles >= board->cpu->nextEvent);
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}
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static int32_t GBATimersProcessEvents(struct GBA* gba, int32_t cycles) {
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int32_t nextEvent = INT_MAX;
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if (gba->timersEnabled) {
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struct GBATimer* timer;
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struct GBATimer* nextTimer;
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timer = &gba->timers[0];
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if (timer->enable) {
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timer->nextEvent -= cycles;
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timer->lastEvent -= cycles;
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if (timer->nextEvent <= 0) {
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timer->lastEvent = timer->nextEvent;
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timer->nextEvent += timer->overflowInterval;
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gba->memory.io[REG_TM0CNT_LO >> 1] = timer->reload;
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timer->oldReload = timer->reload;
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if (timer->doIrq) {
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GBARaiseIRQ(gba, IRQ_TIMER0);
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}
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if (gba->audio.enable) {
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if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 0) {
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GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
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}
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if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 0) {
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GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
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}
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}
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nextTimer = &gba->timers[1];
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if (nextTimer->countUp) {
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++gba->memory.io[REG_TM1CNT_LO >> 1];
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if (!gba->memory.io[REG_TM1CNT_LO >> 1]) {
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nextTimer->nextEvent = 0;
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}
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}
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}
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nextEvent = timer->nextEvent;
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}
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timer = &gba->timers[1];
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if (timer->enable) {
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timer->nextEvent -= cycles;
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timer->lastEvent -= cycles;
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if (timer->nextEvent <= 0) {
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timer->lastEvent = timer->nextEvent;
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timer->nextEvent += timer->overflowInterval;
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gba->memory.io[REG_TM1CNT_LO >> 1] = timer->reload;
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timer->oldReload = timer->reload;
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if (timer->doIrq) {
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GBARaiseIRQ(gba, IRQ_TIMER1);
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}
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if (gba->audio.enable) {
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if ((gba->audio.chALeft || gba->audio.chARight) && gba->audio.chATimer == 1) {
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GBAAudioSampleFIFO(&gba->audio, 0, timer->lastEvent);
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}
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if ((gba->audio.chBLeft || gba->audio.chBRight) && gba->audio.chBTimer == 1) {
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GBAAudioSampleFIFO(&gba->audio, 1, timer->lastEvent);
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}
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}
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if (timer->countUp) {
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timer->nextEvent = INT_MAX;
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}
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nextTimer = &gba->timers[2];
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if (nextTimer->countUp) {
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++gba->memory.io[REG_TM2CNT_LO >> 1];
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if (!gba->memory.io[REG_TM2CNT_LO >> 1]) {
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nextTimer->nextEvent = 0;
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}
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}
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}
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if (timer->nextEvent < nextEvent) {
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nextEvent = timer->nextEvent;
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}
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}
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timer = &gba->timers[2];
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if (timer->enable) {
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timer->nextEvent -= cycles;
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timer->lastEvent -= cycles;
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nextEvent = timer->nextEvent;
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if (timer->nextEvent <= 0) {
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timer->lastEvent = timer->nextEvent;
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timer->nextEvent += timer->overflowInterval;
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gba->memory.io[REG_TM2CNT_LO >> 1] = timer->reload;
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timer->oldReload = timer->reload;
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if (timer->doIrq) {
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GBARaiseIRQ(gba, IRQ_TIMER2);
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}
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if (timer->countUp) {
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timer->nextEvent = INT_MAX;
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}
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nextTimer = &gba->timers[3];
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if (nextTimer->countUp) {
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++gba->memory.io[REG_TM3CNT_LO >> 1];
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if (!gba->memory.io[REG_TM3CNT_LO >> 1]) {
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nextTimer->nextEvent = 0;
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}
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}
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}
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if (timer->nextEvent < nextEvent) {
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nextEvent = timer->nextEvent;
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}
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}
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timer = &gba->timers[3];
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if (timer->enable) {
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timer->nextEvent -= cycles;
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timer->lastEvent -= cycles;
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nextEvent = timer->nextEvent;
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if (timer->nextEvent <= 0) {
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timer->lastEvent = timer->nextEvent;
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timer->nextEvent += timer->overflowInterval;
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gba->memory.io[REG_TM3CNT_LO >> 1] = timer->reload;
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timer->oldReload = timer->reload;
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if (timer->doIrq) {
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GBARaiseIRQ(gba, IRQ_TIMER3);
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}
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if (timer->countUp) {
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timer->nextEvent = INT_MAX;
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}
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}
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if (timer->nextEvent < nextEvent) {
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nextEvent = timer->nextEvent;
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}
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}
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}
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return nextEvent;
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}
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#ifdef USE_DEBUGGER
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void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger) {
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ARMDebuggerInit(debugger, &gba->cpu);
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gba->debugger = debugger;
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}
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#endif
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void GBALoadROM(struct GBA* gba, int fd, const char* fname) {
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struct stat info;
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gba->memory.rom = fileMemoryMap(fd, SIZE_CART0, MEMORY_READ);
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gba->activeFile = fname;
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fstat(fd, &info);
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gba->memory.romSize = info.st_size;
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if (gba->savefile) {
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GBASavedataInit(&gba->memory.savedata, gba->savefile);
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}
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GBAGPIOInit(&gba->memory.gpio, &((uint16_t*) gba->memory.rom)[GPIO_REG_DATA >> 1]);
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_checkOverrides(gba, ((struct GBACartridge*) gba->memory.rom)->id);
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// TODO: error check
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}
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void GBALoadBIOS(struct GBA* gba, int fd) {
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gba->memory.bios = fileMemoryMap(fd, SIZE_BIOS, MEMORY_READ);
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gba->memory.fullBios = 1;
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uint32_t checksum = GBAChecksum(gba->memory.bios, SIZE_BIOS);
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GBALog(gba, GBA_LOG_DEBUG, "BIOS Checksum: 0x%X", checksum);
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if (checksum == GBA_BIOS_CHECKSUM) {
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GBALog(gba, GBA_LOG_INFO, "Official GBA BIOS detected");
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} else if (checksum == GBA_DS_BIOS_CHECKSUM) {
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GBALog(gba, GBA_LOG_INFO, "Official GBA (DS) BIOS detected");
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} else {
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GBALog(gba, GBA_LOG_WARN, "BIOS checksum incorrect");
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}
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gba->biosChecksum = checksum;
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if ((gba->cpu.gprs[ARM_PC] >> BASE_OFFSET) == BASE_BIOS) {
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gba->memory.d.setActiveRegion(&gba->memory.d, gba->cpu.gprs[ARM_PC]);
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}
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// TODO: error check
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}
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void GBATimerUpdateRegister(struct GBA* gba, int timer) {
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struct GBATimer* currentTimer = &gba->timers[timer];
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if (currentTimer->enable && !currentTimer->countUp) {
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gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu.cycles - currentTimer->lastEvent) >> currentTimer->prescaleBits);
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}
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}
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void GBATimerWriteTMCNT_LO(struct GBA* gba, int timer, uint16_t reload) {
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gba->timers[timer].reload = reload;
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}
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void GBATimerWriteTMCNT_HI(struct GBA* gba, int timer, uint16_t control) {
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struct GBATimer* currentTimer = &gba->timers[timer];
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GBATimerUpdateRegister(gba, timer);
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int oldPrescale = currentTimer->prescaleBits;
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switch (control & 0x0003) {
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case 0x0000:
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currentTimer->prescaleBits = 0;
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break;
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case 0x0001:
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currentTimer->prescaleBits = 6;
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break;
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case 0x0002:
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currentTimer->prescaleBits = 8;
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break;
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case 0x0003:
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currentTimer->prescaleBits = 10;
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break;
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}
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currentTimer->countUp = !!(control & 0x0004);
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currentTimer->doIrq = !!(control & 0x0040);
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currentTimer->overflowInterval = (0x10000 - currentTimer->reload) << currentTimer->prescaleBits;
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int wasEnabled = currentTimer->enable;
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currentTimer->enable = !!(control & 0x0080);
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if (!wasEnabled && currentTimer->enable) {
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if (!currentTimer->countUp) {
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currentTimer->nextEvent = gba->cpu.cycles + currentTimer->overflowInterval;
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} else {
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currentTimer->nextEvent = INT_MAX;
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}
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gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->reload;
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currentTimer->oldReload = currentTimer->reload;
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gba->timersEnabled |= 1 << timer;
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} else if (wasEnabled && !currentTimer->enable) {
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if (!currentTimer->countUp) {
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gba->memory.io[(REG_TM0CNT_LO + (timer << 2)) >> 1] = currentTimer->oldReload + ((gba->cpu.cycles - currentTimer->lastEvent) >> oldPrescale);
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}
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gba->timersEnabled &= ~(1 << timer);
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} else if (currentTimer->prescaleBits != oldPrescale && !currentTimer->countUp) {
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// FIXME: this might be before present
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currentTimer->nextEvent = currentTimer->lastEvent + currentTimer->overflowInterval;
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}
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if (currentTimer->nextEvent < gba->cpu.nextEvent) {
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gba->cpu.nextEvent = currentTimer->nextEvent;
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}
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};
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void GBAWriteIE(struct GBA* gba, uint16_t value) {
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if (value & (1 << IRQ_SIO)) {
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GBALog(gba, GBA_LOG_STUB, "SIO interrupts not implemented");
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}
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if (value & (1 << IRQ_KEYPAD)) {
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GBALog(gba, GBA_LOG_STUB, "Keypad interrupts not implemented");
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}
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if (value & (1 << IRQ_GAMEPAK)) {
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GBALog(gba, GBA_LOG_STUB, "Gamepak interrupts not implemented");
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}
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if (gba->memory.io[REG_IME >> 1] && value & gba->memory.io[REG_IF >> 1]) {
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ARMRaiseIRQ(&gba->cpu);
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}
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}
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void GBAWriteIME(struct GBA* gba, uint16_t value) {
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if (value && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
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ARMRaiseIRQ(&gba->cpu);
|
|
}
|
|
}
|
|
|
|
void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
|
|
gba->memory.io[REG_IF >> 1] |= 1 << irq;
|
|
|
|
if (gba->memory.io[REG_IME >> 1] && (gba->memory.io[REG_IE >> 1] & 1 << irq)) {
|
|
ARMRaiseIRQ(&gba->cpu);
|
|
}
|
|
}
|
|
|
|
void GBATestIRQ(struct ARMBoard* board) {
|
|
struct GBABoard* gbaBoard = (struct GBABoard*) board;
|
|
struct GBA* gba = gbaBoard->p;
|
|
if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
|
|
gba->springIRQ = 1;
|
|
gba->cpu.nextEvent = 0;
|
|
}
|
|
}
|
|
|
|
int GBAWaitForIRQ(struct GBA* gba) {
|
|
int irqs = gba->memory.io[REG_IF >> 1];
|
|
int newIRQs = 0;
|
|
gba->memory.io[REG_IF >> 1] = 0;
|
|
while (1) {
|
|
if (gba->cpu.nextEvent == INT_MAX) {
|
|
break;
|
|
} else {
|
|
gba->cpu.cycles = gba->cpu.nextEvent;
|
|
GBAProcessEvents(&gba->board.d);
|
|
if (gba->memory.io[REG_IF >> 1]) {
|
|
newIRQs = gba->memory.io[REG_IF >> 1];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
gba->memory.io[REG_IF >> 1] = newIRQs | irqs;
|
|
return newIRQs;
|
|
}
|
|
|
|
int GBAHalt(struct GBA* gba) {
|
|
return GBAWaitForIRQ(gba);
|
|
}
|
|
|
|
void GBALog(struct GBA* gba, enum GBALogLevel level, const char* format, ...) {
|
|
if (!gba) {
|
|
struct GBAThread* threadContext = GBAThreadGetContext();
|
|
if (threadContext) {
|
|
gba = threadContext->gba;
|
|
}
|
|
}
|
|
|
|
if (gba && gba->logHandler) {
|
|
va_list args;
|
|
va_start(args, format);
|
|
gba->logHandler(gba, level, format, args);
|
|
va_end(args);
|
|
return;
|
|
}
|
|
|
|
if (gba && !(level & gba->logLevel)) {
|
|
return;
|
|
}
|
|
|
|
va_list args;
|
|
va_start(args, format);
|
|
vprintf(format, args);
|
|
va_end(args);
|
|
printf("\n");
|
|
}
|
|
|
|
void GBAHitStub(struct ARMBoard* board, uint32_t opcode) {
|
|
struct GBABoard* gbaBoard = (struct GBABoard*) board;
|
|
GBALog(gbaBoard->p, GBA_LOG_STUB, "Stub opcode: %08x", opcode);
|
|
#ifdef USE_DEBUGGER
|
|
if (!gbaBoard->p->debugger) {
|
|
abort();
|
|
} else {
|
|
ARMDebuggerEnter(gbaBoard->p->debugger);
|
|
}
|
|
#else
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
void GBAIllegal(struct ARMBoard* board, uint32_t opcode) {
|
|
struct GBABoard* gbaBoard = (struct GBABoard*) board;
|
|
GBALog(gbaBoard->p, GBA_LOG_WARN, "Illegal opcode: %08x", opcode);
|
|
#ifdef USE_DEBUGGER
|
|
if (gbaBoard->p->debugger) {
|
|
ARMDebuggerEnter(gbaBoard->p->debugger);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void _checkOverrides(struct GBA* gba, uint32_t id) {
|
|
int i;
|
|
for (i = 0; _overrides[i].id; ++i) {
|
|
if (_overrides[i].id == id) {
|
|
switch (_overrides[i].type) {
|
|
case SAVEDATA_FLASH512:
|
|
case SAVEDATA_FLASH1M:
|
|
gba->memory.savedata.type = _overrides[i].type;
|
|
GBASavedataInitFlash(&gba->memory.savedata);
|
|
break;
|
|
case SAVEDATA_EEPROM:
|
|
GBASavedataInitEEPROM(&gba->memory.savedata);
|
|
break;
|
|
case SAVEDATA_SRAM:
|
|
GBASavedataInitSRAM(&gba->memory.savedata);
|
|
break;
|
|
case SAVEDATA_NONE:
|
|
break;
|
|
}
|
|
|
|
if (_overrides[i].gpio & GPIO_RTC) {
|
|
GBAGPIOInitRTC(&gba->memory.gpio);
|
|
}
|
|
|
|
if (_overrides[i].gpio & GPIO_GYRO) {
|
|
GBAGPIOInitGyro(&gba->memory.gpio);
|
|
}
|
|
|
|
if (_overrides[i].gpio & GPIO_RUMBLE) {
|
|
GBAGPIOInitRumble(&gba->memory.gpio);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
}
|