1131 lines
28 KiB
C
1131 lines
28 KiB
C
/* Copyright (c) 2013-2016 Jeffrey Pfau
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <mgba/internal/gb/gb.h>
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#include <mgba/internal/defines.h>
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#include <mgba/internal/gb/io.h>
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#include <mgba/internal/gb/mbc.h>
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#include <mgba/internal/sm83/sm83.h>
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#include <mgba/core/core.h>
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#include <mgba/core/cheats.h>
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#include <mgba-util/crc32.h>
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#include <mgba-util/memory.h>
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#include <mgba-util/math.h>
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#include <mgba-util/patch.h>
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#include <mgba-util/vfs.h>
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const uint32_t CGB_SM83_FREQUENCY = 0x800000;
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const uint32_t SGB_SM83_FREQUENCY = 0x418B1E;
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const uint32_t GB_COMPONENT_MAGIC = 0x400000;
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static const uint8_t _knownHeader[4] = {0xCE, 0xED, 0x66, 0x66};
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static const uint8_t _knownHeaderSachen[4] = {0x7C, 0xE7, 0xC0, 0x00};
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static const uint8_t _registeredTrademark[] = {0x3C, 0x42, 0xB9, 0xA5, 0xB9, 0xA5, 0x42, 0x3C};
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#define DMG0_BIOS_CHECKSUM 0xC2F5CC97
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#define DMG_BIOS_CHECKSUM 0x59C8598E
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#define MGB_BIOS_CHECKSUM 0xE6920754
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#define SGB_BIOS_CHECKSUM 0xEC8A83B9
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#define SGB2_BIOS_CHECKSUM 0X53D0DD63
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#define CGB_BIOS_CHECKSUM 0x41884E46
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#define AGB_BIOS_CHECKSUM 0xFFD6B0F1
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mLOG_DEFINE_CATEGORY(GB, "GB", "gb");
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static void GBInit(void* cpu, struct mCPUComponent* component);
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static void GBDeinit(struct mCPUComponent* component);
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static void GBInterruptHandlerInit(struct SM83InterruptHandler* irqh);
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static void GBProcessEvents(struct SM83Core* cpu);
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static void GBSetInterrupts(struct SM83Core* cpu, bool enable);
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static uint16_t GBIRQVector(struct SM83Core* cpu);
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static void GBIllegal(struct SM83Core* cpu);
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static void GBStop(struct SM83Core* cpu);
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static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate);
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void GBCreate(struct GB* gb) {
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gb->d.id = GB_COMPONENT_MAGIC;
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gb->d.init = GBInit;
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gb->d.deinit = GBDeinit;
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}
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static void GBInit(void* cpu, struct mCPUComponent* component) {
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struct GB* gb = (struct GB*) component;
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gb->cpu = cpu;
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gb->sync = NULL;
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GBInterruptHandlerInit(&gb->cpu->irqh);
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GBMemoryInit(gb);
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gb->video.p = gb;
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GBVideoInit(&gb->video);
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gb->audio.p = gb;
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GBAudioInit(&gb->audio, 2048, &gb->memory.io[GB_REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
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gb->sio.p = gb;
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GBSIOInit(&gb->sio);
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gb->timer.p = gb;
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gb->model = GB_MODEL_AUTODETECT;
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gb->biosVf = NULL;
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gb->romVf = NULL;
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gb->sramVf = NULL;
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gb->sramRealVf = NULL;
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gb->isPristine = false;
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gb->pristineRomSize = 0;
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gb->yankedRomSize = 0;
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memset(&gb->gbx, 0, sizeof(gb->gbx));
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mCoreCallbacksListInit(&gb->coreCallbacks, 0);
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gb->stream = NULL;
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mTimingInit(&gb->timing, &gb->cpu->cycles, &gb->cpu->nextEvent);
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gb->audio.timing = &gb->timing;
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gb->eiPending.name = "GB EI";
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gb->eiPending.callback = _enableInterrupts;
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gb->eiPending.context = gb;
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gb->eiPending.priority = 0;
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}
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static void GBDeinit(struct mCPUComponent* component) {
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struct GB* gb = (struct GB*) component;
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mTimingDeinit(&gb->timing);
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}
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bool GBLoadGBX(struct GBXMetadata* metadata, struct VFile* vf) {
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uint8_t footer[16];
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if (vf->seek(vf, -sizeof(footer), SEEK_END) < 0) {
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return false;
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}
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if (vf->read(vf, footer, sizeof(footer)) < (ssize_t) sizeof(footer)) {
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return false;
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}
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int32_t gbxSize = 0;
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uint32_t vers;
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LOAD_32BE(gbxSize, 0, footer);
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LOAD_32BE(vers, 4, footer);
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if (memcmp(&footer[12], "GBX!", 4) != 0 || gbxSize != 0x40 || vers != 1) {
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return false;
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}
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if (vf->seek(vf, -gbxSize, SEEK_END) < 0) {
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return false;
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}
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if (vf->read(vf, footer, sizeof(footer)) != (ssize_t) sizeof(footer)) {
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return false;
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}
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memset(metadata, 0, sizeof(*metadata));
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metadata->mbc = GBMBCFromGBX(footer);
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if (footer[4] == 1) {
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metadata->battery = true;
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}
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if (footer[5] == 1) {
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metadata->rumble = true;
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if (metadata->mbc == GB_MBC5) {
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metadata->mbc = GB_MBC5_RUMBLE;
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}
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}
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if (footer[6] == 1) {
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metadata->timer = true;
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if (metadata->mbc == GB_MBC3) {
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metadata->mbc = GB_MBC3_RTC;
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}
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}
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LOAD_32BE(metadata->romSize, 8, footer);
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LOAD_32BE(metadata->ramSize, 12, footer);
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vf->read(vf, &metadata->mapperVars, 0x20);
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// There's no dedicated mapper type for MBC1M so let's stash some data here
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if (memcmp(footer, "MBC1", 4) == 0) {
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metadata->mapperVars.u8[0] = 5;
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} else if (memcmp(footer, "MB1M", 4) == 0) {
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metadata->mapperVars.u8[0] = 4;
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}
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return true;
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}
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bool GBLoadROM(struct GB* gb, struct VFile* vf) {
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if (!vf) {
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return false;
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}
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GBUnloadROM(gb);
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if (!GBLoadGBX(&gb->gbx, vf)) {
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// GBX handles the pristine size itself, but other formats don't
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gb->pristineRomSize = vf->size(vf);
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} else {
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uint32_t fileSize = vf->size(vf);
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if (gb->gbx.romSize <= fileSize - 0x40) {
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gb->pristineRomSize = gb->gbx.romSize;
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} else {
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// TODO: Should we make a temporary buffer?
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mLOG(GB, WARN, "GBX file size %d is larger than real file size %d", gb->gbx.romSize, fileSize - 0x40);
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gb->pristineRomSize = fileSize - 0x40;
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}
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}
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gb->romVf = vf;
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vf->seek(vf, 0, SEEK_SET);
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gb->isPristine = true;
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gb->memory.rom = vf->map(vf, gb->pristineRomSize, MAP_READ);
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if (!gb->memory.rom) {
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return false;
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}
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gb->yankedRomSize = 0;
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gb->memory.romSize = gb->pristineRomSize;
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gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
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GBMBCReset(gb);
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if (gb->cpu) {
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struct SM83Core* cpu = gb->cpu;
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if (!gb->memory.romBase) {
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GBMBCSwitchBank0(gb, 0);
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}
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cpu->memory.setActiveRegion(cpu, cpu->pc);
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}
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// TODO: error check
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return true;
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}
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void GBYankROM(struct GB* gb) {
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gb->yankedRomSize = gb->memory.romSize;
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gb->yankedMbc = gb->memory.mbcType;
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gb->memory.romSize = 0;
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gb->memory.mbcType = GB_MBC_NONE;
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GBMBCReset(gb);
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if (gb->cpu) {
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struct SM83Core* cpu = gb->cpu;
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cpu->memory.setActiveRegion(cpu, cpu->pc);
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}
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}
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static void GBSramDeinit(struct GB* gb) {
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if (gb->sramVf) {
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gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
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if (gb->sramVf == gb->sramRealVf) {
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if (gb->memory.mbcType == GB_MBC3_RTC) {
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GBMBCRTCWrite(gb);
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} else if (gb->memory.mbcType == GB_HuC3) {
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GBMBCHuC3Write(gb);
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}
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}
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gb->sramVf = NULL;
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} else if (gb->memory.sram) {
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mappedMemoryFree(gb->memory.sram, gb->sramSize);
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}
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gb->memory.sram = 0;
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}
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bool GBLoadSave(struct GB* gb, struct VFile* vf) {
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GBSramDeinit(gb);
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gb->sramVf = vf;
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if (gb->sramRealVf && gb->sramRealVf != vf) {
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gb->sramRealVf->close(gb->sramRealVf);
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}
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gb->sramRealVf = vf;
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if (gb->sramSize) {
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GBResizeSram(gb, gb->sramSize);
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GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
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if (gb->memory.mbcType == GB_MBC3_RTC) {
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GBMBCRTCRead(gb);
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} else if (gb->memory.mbcType == GB_HuC3) {
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GBMBCHuC3Read(gb);
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}
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}
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return vf;
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}
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void GBResizeSram(struct GB* gb, size_t size) {
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if (gb->memory.sram && size <= gb->sramSize) {
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return;
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}
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struct VFile* vf = gb->sramVf;
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if (vf) {
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if (vf == gb->sramRealVf) {
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ssize_t vfSize = vf->size(vf);
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if (vfSize >= 0 && (size_t) vfSize < size) {
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uint8_t extdataBuffer[0x100];
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if (vfSize & 0xFF) {
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vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
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vf->read(vf, extdataBuffer, vfSize & 0xFF);
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}
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if (gb->memory.sram) {
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vf->unmap(vf, gb->memory.sram, gb->sramSize);
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}
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vf->truncate(vf, size + (vfSize & 0xFF));
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if (vfSize & 0xFF) {
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vf->seek(vf, size, SEEK_SET);
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vf->write(vf, extdataBuffer, vfSize & 0xFF);
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}
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gb->memory.sram = vf->map(vf, size, MAP_WRITE);
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memset(&gb->memory.sram[vfSize], 0xFF, size - vfSize);
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} else if (size > gb->sramSize || !gb->memory.sram) {
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if (gb->memory.sram) {
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vf->unmap(vf, gb->memory.sram, gb->sramSize);
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}
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gb->memory.sram = vf->map(vf, size, MAP_WRITE);
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}
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} else {
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if (gb->memory.sram) {
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vf->unmap(vf, gb->memory.sram, gb->sramSize);
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}
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if (vf->size(vf) < gb->sramSize) {
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void* sram = vf->map(vf, vf->size(vf), MAP_READ);
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struct VFile* newVf = VFileMemChunk(sram, vf->size(vf));
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vf->unmap(vf, sram,vf->size(vf));
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vf = newVf;
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gb->sramVf = newVf;
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vf->truncate(vf, size);
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}
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gb->memory.sram = vf->map(vf, size, MAP_READ);
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}
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if (gb->memory.sram == (void*) -1) {
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gb->memory.sram = NULL;
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}
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} else if (size) {
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uint8_t* newSram = anonymousMemoryMap(size);
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if (gb->memory.sram) {
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if (size > gb->sramSize) {
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memcpy(newSram, gb->memory.sram, gb->sramSize);
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memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
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} else {
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memcpy(newSram, gb->memory.sram, size);
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}
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mappedMemoryFree(gb->memory.sram, gb->sramSize);
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} else {
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memset(newSram, 0xFF, size);
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}
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gb->memory.sram = newSram;
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}
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if (gb->sramSize < size) {
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gb->sramSize = size;
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}
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}
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void GBSramClean(struct GB* gb, uint32_t frameCount) {
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// TODO: Share with GBASavedataClean
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if (!gb->sramVf) {
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return;
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}
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if (mSavedataClean(&gb->sramDirty, &gb->sramDirtAge, frameCount)) {
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if (gb->sramMaskWriteback) {
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GBSavedataUnmask(gb);
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}
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if (gb->memory.mbcType == GB_MBC3_RTC) {
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GBMBCRTCWrite(gb);
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} else if (gb->memory.mbcType == GB_HuC3) {
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GBMBCHuC3Write(gb);
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}
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if (gb->sramVf == gb->sramRealVf) {
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if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
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mLOG(GB_MEM, INFO, "Savedata synced");
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} else {
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mLOG(GB_MEM, INFO, "Savedata failed to sync!");
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}
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}
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size_t c;
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for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
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struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
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if (callbacks->savedataUpdated) {
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callbacks->savedataUpdated(callbacks->context);
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}
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}
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}
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}
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void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
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struct VFile* oldVf = gb->sramVf;
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GBSramDeinit(gb);
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if (oldVf && oldVf != gb->sramRealVf) {
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oldVf->close(oldVf);
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}
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gb->sramVf = vf;
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gb->sramMaskWriteback = writeback;
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GBResizeSram(gb, gb->sramSize);
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GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
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}
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void GBSavedataUnmask(struct GB* gb) {
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if (!gb->sramRealVf || gb->sramVf == gb->sramRealVf) {
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return;
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}
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struct VFile* vf = gb->sramVf;
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GBSramDeinit(gb);
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gb->sramVf = gb->sramRealVf;
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gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
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if (gb->sramMaskWriteback) {
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vf->seek(vf, 0, SEEK_SET);
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vf->read(vf, gb->memory.sram, gb->sramSize);
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gb->sramMaskWriteback = false;
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}
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GBMBCSwitchSramBank(gb, gb->memory.sramCurrentBank);
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vf->close(vf);
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}
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void GBUnloadROM(struct GB* gb) {
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// TODO: Share with GBAUnloadROM
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off_t romBase = gb->memory.romBase - gb->memory.rom;
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if (romBase >= 0 && ((size_t) romBase < gb->memory.romSize || (size_t) romBase < gb->yankedRomSize)) {
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gb->memory.romBase = NULL;
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}
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if (gb->memory.rom && !gb->isPristine) {
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if (gb->yankedRomSize) {
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gb->yankedRomSize = 0;
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}
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mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
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}
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if (gb->romVf) {
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#ifndef FIXED_ROM_BUFFER
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gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
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#endif
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gb->romVf->close(gb->romVf);
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gb->romVf = NULL;
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}
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gb->memory.rom = NULL;
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gb->memory.mbcType = GB_MBC_AUTODETECT;
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gb->isPristine = false;
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if (!gb->sramDirty) {
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gb->sramMaskWriteback = false;
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}
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GBSavedataUnmask(gb);
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GBSramDeinit(gb);
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if (gb->sramRealVf) {
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gb->sramRealVf->close(gb->sramRealVf);
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}
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gb->sramRealVf = NULL;
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gb->sramVf = NULL;
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if (gb->memory.cam && gb->memory.cam->stopRequestImage) {
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gb->memory.cam->stopRequestImage(gb->memory.cam);
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}
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}
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void GBSynthesizeROM(struct VFile* vf) {
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if (!vf) {
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return;
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}
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const struct GBCartridge cart = {
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.logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
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};
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vf->seek(vf, 0x100, SEEK_SET);
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vf->write(vf, &cart, sizeof(cart));
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}
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void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
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gb->biosVf = vf;
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}
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void GBApplyPatch(struct GB* gb, struct Patch* patch) {
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size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
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if (!patchedSize) {
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return;
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}
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if (patchedSize > GB_SIZE_CART_MAX) {
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patchedSize = GB_SIZE_CART_MAX;
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}
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void* newRom = anonymousMemoryMap(GB_SIZE_CART_MAX);
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if (!patch->applyPatch(patch, gb->memory.rom, gb->pristineRomSize, newRom, patchedSize)) {
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mappedMemoryFree(newRom, GB_SIZE_CART_MAX);
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return;
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}
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if (gb->romVf) {
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#ifndef FIXED_ROM_BUFFER
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gb->romVf->unmap(gb->romVf, gb->memory.rom, gb->pristineRomSize);
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#endif
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gb->romVf->close(gb->romVf);
|
|
gb->romVf = NULL;
|
|
}
|
|
gb->isPristine = false;
|
|
if (gb->memory.romBase == gb->memory.rom) {
|
|
gb->memory.romBase = newRom;
|
|
}
|
|
gb->memory.rom = newRom;
|
|
gb->memory.romSize = patchedSize;
|
|
gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
|
|
gb->cpu->memory.setActiveRegion(gb->cpu, gb->cpu->pc);
|
|
}
|
|
|
|
void GBDestroy(struct GB* gb) {
|
|
GBUnmapBIOS(gb);
|
|
GBUnloadROM(gb);
|
|
|
|
if (gb->biosVf) {
|
|
gb->biosVf->close(gb->biosVf);
|
|
gb->biosVf = 0;
|
|
}
|
|
|
|
GBMemoryDeinit(gb);
|
|
GBAudioDeinit(&gb->audio);
|
|
GBVideoDeinit(&gb->video);
|
|
GBSIODeinit(&gb->sio);
|
|
mCoreCallbacksListDeinit(&gb->coreCallbacks);
|
|
}
|
|
|
|
void GBInterruptHandlerInit(struct SM83InterruptHandler* irqh) {
|
|
irqh->reset = GBReset;
|
|
irqh->processEvents = GBProcessEvents;
|
|
irqh->setInterrupts = GBSetInterrupts;
|
|
irqh->irqVector = GBIRQVector;
|
|
irqh->hitIllegal = GBIllegal;
|
|
irqh->stop = GBStop;
|
|
irqh->halt = GBHalt;
|
|
}
|
|
|
|
static uint32_t _GBBiosCRC32(struct VFile* vf) {
|
|
ssize_t size = vf->size(vf);
|
|
if (size <= 0 || size > GB_SIZE_CART_BANK0) {
|
|
return 0;
|
|
}
|
|
void* bios = vf->map(vf, size, MAP_READ);
|
|
uint32_t biosCrc = doCrc32(bios, size);
|
|
vf->unmap(vf, bios, size);
|
|
return biosCrc;
|
|
}
|
|
|
|
bool GBIsBIOS(struct VFile* vf) {
|
|
switch (_GBBiosCRC32(vf)) {
|
|
case DMG_BIOS_CHECKSUM:
|
|
case DMG0_BIOS_CHECKSUM:
|
|
case MGB_BIOS_CHECKSUM:
|
|
case SGB_BIOS_CHECKSUM:
|
|
case SGB2_BIOS_CHECKSUM:
|
|
case CGB_BIOS_CHECKSUM:
|
|
case AGB_BIOS_CHECKSUM:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
void GBReset(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
gb->memory.romBase = gb->memory.rom;
|
|
GBDetectModel(gb);
|
|
|
|
cpu->b = 0;
|
|
cpu->d = 0;
|
|
|
|
gb->timer.internalDiv = 0;
|
|
|
|
gb->cpuBlocked = false;
|
|
gb->earlyExit = false;
|
|
gb->doubleSpeed = 0;
|
|
|
|
if (gb->yankedRomSize) {
|
|
gb->memory.romSize = gb->yankedRomSize;
|
|
gb->memory.mbcType = gb->yankedMbc;
|
|
gb->yankedRomSize = 0;
|
|
}
|
|
|
|
gb->sgbBit = -1;
|
|
gb->sgbControllers = 0;
|
|
gb->sgbCurrentController = 0;
|
|
gb->currentSgbBits = 0;
|
|
gb->sgbIncrement = false;
|
|
memset(gb->sgbPacket, 0, sizeof(gb->sgbPacket));
|
|
|
|
mTimingClear(&gb->timing);
|
|
|
|
GBMemoryReset(gb);
|
|
|
|
if (gb->biosVf) {
|
|
if (!GBIsBIOS(gb->biosVf)) {
|
|
gb->biosVf->close(gb->biosVf);
|
|
gb->biosVf = NULL;
|
|
} else {
|
|
GBMapBIOS(gb);
|
|
cpu->a = 0;
|
|
cpu->f.packed = 0;
|
|
cpu->c = 0;
|
|
cpu->e = 0;
|
|
cpu->h = 0;
|
|
cpu->l = 0;
|
|
cpu->sp = 0;
|
|
cpu->pc = 0;
|
|
}
|
|
}
|
|
|
|
switch (gb->model) {
|
|
case GB_MODEL_DMG:
|
|
case GB_MODEL_SGB:
|
|
case GB_MODEL_AUTODETECT: //Silence warnings
|
|
gb->audio.style = GB_AUDIO_DMG;
|
|
break;
|
|
case GB_MODEL_MGB:
|
|
case GB_MODEL_SGB2:
|
|
gb->audio.style = GB_AUDIO_MGB;
|
|
break;
|
|
case GB_MODEL_AGB:
|
|
case GB_MODEL_CGB:
|
|
case GB_MODEL_SCGB:
|
|
gb->audio.style = GB_AUDIO_CGB;
|
|
break;
|
|
}
|
|
|
|
GBVideoReset(&gb->video);
|
|
GBTimerReset(&gb->timer);
|
|
GBIOReset(gb);
|
|
if (!gb->biosVf && gb->memory.rom) {
|
|
GBSkipBIOS(gb);
|
|
} else {
|
|
mTimingSchedule(&gb->timing, &gb->timer.event, 0);
|
|
}
|
|
|
|
GBAudioReset(&gb->audio);
|
|
GBSIOReset(&gb->sio);
|
|
|
|
cpu->memory.setActiveRegion(cpu, cpu->pc);
|
|
|
|
gb->sramMaskWriteback = false;
|
|
GBSavedataUnmask(gb);
|
|
}
|
|
|
|
void GBSkipBIOS(struct GB* gb) {
|
|
struct SM83Core* cpu = gb->cpu;
|
|
const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
|
|
int nextDiv = 0;
|
|
|
|
switch (gb->model) {
|
|
case GB_MODEL_AUTODETECT: // Silence warnings
|
|
gb->model = GB_MODEL_DMG;
|
|
// Fall through
|
|
case GB_MODEL_DMG:
|
|
cpu->a = 1;
|
|
cpu->f.packed = 0xB0;
|
|
cpu->c = 0x13;
|
|
cpu->e = 0xD8;
|
|
cpu->h = 1;
|
|
cpu->l = 0x4D;
|
|
gb->timer.internalDiv = 0xABC;
|
|
nextDiv = 4;
|
|
break;
|
|
case GB_MODEL_SGB:
|
|
cpu->a = 1;
|
|
cpu->f.packed = 0x00;
|
|
cpu->c = 0x14;
|
|
cpu->e = 0x00;
|
|
cpu->h = 0xC0;
|
|
cpu->l = 0x60;
|
|
gb->timer.internalDiv = 0xD85;
|
|
nextDiv = 8;
|
|
break;
|
|
case GB_MODEL_MGB:
|
|
cpu->a = 0xFF;
|
|
cpu->f.packed = 0xB0;
|
|
cpu->c = 0x13;
|
|
cpu->e = 0xD8;
|
|
cpu->h = 1;
|
|
cpu->l = 0x4D;
|
|
gb->timer.internalDiv = 0xABC;
|
|
nextDiv = 4;
|
|
break;
|
|
case GB_MODEL_SGB2:
|
|
cpu->a = 0xFF;
|
|
cpu->f.packed = 0x00;
|
|
cpu->c = 0x14;
|
|
cpu->e = 0x00;
|
|
cpu->h = 0xC0;
|
|
cpu->l = 0x60;
|
|
gb->timer.internalDiv = 0xD84;
|
|
nextDiv = 8;
|
|
break;
|
|
case GB_MODEL_AGB:
|
|
cpu->b = 1;
|
|
// Fall through
|
|
case GB_MODEL_CGB:
|
|
case GB_MODEL_SCGB:
|
|
cpu->a = 0x11;
|
|
if (gb->model == GB_MODEL_AGB) {
|
|
cpu->f.packed = 0x00;
|
|
} else {
|
|
cpu->f.packed = 0x80;
|
|
}
|
|
cpu->c = 0;
|
|
cpu->h = 0;
|
|
if (cart->cgb & 0x80) {
|
|
cpu->d = 0xFF;
|
|
cpu->e = 0x56;
|
|
cpu->l = 0x0D;
|
|
gb->timer.internalDiv = 0x2F0;
|
|
} else {
|
|
cpu->e = 0x08;
|
|
cpu->l = 0x7C;
|
|
gb->timer.internalDiv = 0x260;
|
|
gb->model = GB_MODEL_DMG;
|
|
gb->memory.io[GB_REG_KEY1] = 0xFF;
|
|
gb->memory.io[GB_REG_BCPS] = 0x88; // Faked writing 4 BG palette entries
|
|
gb->memory.io[GB_REG_OCPS] = 0x90; // Faked writing 8 OBJ palette entries
|
|
gb->memory.io[GB_REG_SVBK] = 0xFF;
|
|
GBVideoDisableCGB(&gb->video);
|
|
}
|
|
nextDiv = 0xC;
|
|
break;
|
|
}
|
|
|
|
unsigned i;
|
|
for (i = 0; i < sizeof(cart->logo); ++i) {
|
|
uint8_t byte = GBLoad8(cpu, 0x104 + i);
|
|
|
|
uint8_t output0 = 0;
|
|
uint8_t output1 = 0;
|
|
|
|
output0 |= (byte & 0x80) >> 0;
|
|
output0 |= (byte & 0x40) >> 1;
|
|
output0 |= (byte & 0x20) >> 2;
|
|
output0 |= (byte & 0x10) >> 3;
|
|
output0 |= output0 >> 1;
|
|
|
|
output1 |= (byte & 0x08) << 3;
|
|
output1 |= (byte & 0x04) << 2;
|
|
output1 |= (byte & 0x02) << 1;
|
|
output1 |= (byte & 0x01) << 0;
|
|
output1 |= output1 << 1;
|
|
|
|
GBPatch8(cpu, 0x8010 + i * 8, output0, NULL, 0);
|
|
GBPatch8(cpu, 0x8012 + i * 8, output0, NULL, 0);
|
|
GBPatch8(cpu, 0x8014 + i * 8, output1, NULL, 0);
|
|
GBPatch8(cpu, 0x8016 + i * 8, output1, NULL, 0);
|
|
}
|
|
for (i = 0; i < sizeof(_registeredTrademark); ++i) {
|
|
GBPatch8(cpu, 0x8190 + i * 2, _registeredTrademark[i], NULL, 0);
|
|
}
|
|
if (gb->model < GB_MODEL_CGB) {
|
|
for (i = 0; i < 12; ++i) {
|
|
GBPatch8(cpu, 0x9904 + i, i + 1, NULL, 0);
|
|
GBPatch8(cpu, 0x9924 + i, i + 13, NULL, 0);
|
|
}
|
|
GBPatch8(cpu, 0x9910, 0x19, NULL, 0);
|
|
}
|
|
|
|
if (gb->memory.mbcType == GB_UNL_SACHEN_MMC2) {
|
|
gb->memory.mbcState.sachen.locked = GB_SACHEN_UNLOCKED;
|
|
}
|
|
|
|
cpu->sp = 0xFFFE;
|
|
cpu->pc = 0x100;
|
|
|
|
gb->timer.nextDiv = GB_DMG_DIV_PERIOD * (16 - nextDiv);
|
|
|
|
mTimingDeschedule(&gb->timing, &gb->timer.event);
|
|
mTimingSchedule(&gb->timing, &gb->timer.event, gb->timer.nextDiv);
|
|
|
|
if (gb->biosVf) {
|
|
GBUnmapBIOS(gb);
|
|
}
|
|
|
|
GBIOWrite(gb, GB_REG_LCDC, 0x91);
|
|
gb->memory.io[GB_REG_BANK] = 0x1;
|
|
GBVideoSkipBIOS(&gb->video);
|
|
}
|
|
|
|
void GBMapBIOS(struct GB* gb) {
|
|
gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
|
|
gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
|
|
ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
|
|
if (gb->memory.rom) {
|
|
memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
|
|
if (size > 0x100) {
|
|
memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], 0x100);
|
|
}
|
|
}
|
|
}
|
|
|
|
void GBUnmapBIOS(struct GB* gb) {
|
|
if (gb->memory.io[GB_REG_BANK] == 0xFF && gb->memory.romBase != gb->memory.rom) {
|
|
free(gb->memory.romBase);
|
|
if (gb->memory.mbcType == GB_MMM01) {
|
|
GBMBCSwitchBank0(gb, gb->memory.romSize / GB_SIZE_CART_BANK0 - 2);
|
|
} else {
|
|
GBMBCSwitchBank0(gb, 0);
|
|
}
|
|
}
|
|
// XXX: Force AGB registers for AGB-mode
|
|
if (gb->model == GB_MODEL_AGB && gb->cpu->pc == 0x100) {
|
|
gb->cpu->b = 1;
|
|
}
|
|
}
|
|
|
|
void GBDetectModel(struct GB* gb) {
|
|
if (gb->model != GB_MODEL_AUTODETECT) {
|
|
return;
|
|
}
|
|
if (gb->biosVf) {
|
|
switch (_GBBiosCRC32(gb->biosVf)) {
|
|
case DMG_BIOS_CHECKSUM:
|
|
case DMG0_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_DMG;
|
|
break;
|
|
case MGB_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_MGB;
|
|
break;
|
|
case SGB_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_SGB;
|
|
break;
|
|
case SGB2_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_SGB2;
|
|
break;
|
|
case CGB_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_CGB;
|
|
break;
|
|
case AGB_BIOS_CHECKSUM:
|
|
gb->model = GB_MODEL_AGB;
|
|
break;
|
|
default:
|
|
gb->biosVf->close(gb->biosVf);
|
|
gb->biosVf = NULL;
|
|
}
|
|
}
|
|
if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
|
|
const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
|
|
if (cart->cgb & 0x80) {
|
|
gb->model = GB_MODEL_CGB;
|
|
} else if (cart->sgb == 0x03 && cart->oldLicensee == 0x33) {
|
|
gb->model = GB_MODEL_SGB;
|
|
} else {
|
|
gb->model = GB_MODEL_DMG;
|
|
}
|
|
}
|
|
}
|
|
|
|
int GBValidModels(const uint8_t* bank0) {
|
|
const struct GBCartridge* cart = (const struct GBCartridge*) &bank0[0x100];
|
|
int models;
|
|
if (cart->cgb == 0x80) {
|
|
models = GB_MODEL_CGB | GB_MODEL_MGB;
|
|
} else if (cart->cgb == 0xC0) {
|
|
models = GB_MODEL_CGB;
|
|
} else {
|
|
models = GB_MODEL_MGB;
|
|
}
|
|
if (cart->sgb == 0x03 && cart->oldLicensee == 0x33) {
|
|
models |= GB_MODEL_SGB;
|
|
}
|
|
return models;
|
|
}
|
|
|
|
void GBUpdateIRQs(struct GB* gb) {
|
|
int irqs = gb->memory.ie & gb->memory.io[GB_REG_IF] & 0x1F;
|
|
if (!irqs) {
|
|
gb->cpu->irqPending = false;
|
|
return;
|
|
}
|
|
gb->cpu->halted = false;
|
|
|
|
if (!gb->memory.ime) {
|
|
gb->cpu->irqPending = false;
|
|
return;
|
|
}
|
|
if (gb->cpu->irqPending) {
|
|
return;
|
|
}
|
|
SM83RaiseIRQ(gb->cpu);
|
|
}
|
|
|
|
void GBProcessEvents(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
do {
|
|
int32_t cycles = cpu->cycles;
|
|
int32_t nextEvent;
|
|
|
|
cpu->cycles = 0;
|
|
cpu->nextEvent = INT_MAX;
|
|
|
|
nextEvent = cycles;
|
|
do {
|
|
#ifdef USE_DEBUGGERS
|
|
gb->timing.globalCycles += nextEvent;
|
|
#endif
|
|
nextEvent = mTimingTick(&gb->timing, nextEvent);
|
|
} while (gb->cpuBlocked);
|
|
// This loop cannot early exit until the SM83 run loop properly handles mid-M-cycle-exits
|
|
cpu->nextEvent = nextEvent;
|
|
|
|
if (cpu->halted) {
|
|
cpu->cycles = cpu->nextEvent;
|
|
if (!gb->memory.ie || !gb->memory.ime) {
|
|
break;
|
|
}
|
|
}
|
|
if (gb->earlyExit) {
|
|
break;
|
|
}
|
|
} while (cpu->cycles >= cpu->nextEvent);
|
|
gb->earlyExit = false;
|
|
if (gb->cpuBlocked) {
|
|
cpu->cycles = cpu->nextEvent;
|
|
}
|
|
}
|
|
|
|
void GBSetInterrupts(struct SM83Core* cpu, bool enable) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
mTimingDeschedule(&gb->timing, &gb->eiPending);
|
|
if (!enable) {
|
|
gb->memory.ime = false;
|
|
GBUpdateIRQs(gb);
|
|
} else {
|
|
mTimingSchedule(&gb->timing, &gb->eiPending, 4 * cpu->tMultiplier);
|
|
}
|
|
}
|
|
|
|
uint16_t GBIRQVector(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
int irqs = gb->memory.ie & gb->memory.io[GB_REG_IF];
|
|
|
|
if (irqs & (1 << GB_IRQ_VBLANK)) {
|
|
gb->memory.io[GB_REG_IF] &= ~(1 << GB_IRQ_VBLANK);
|
|
return GB_VECTOR_VBLANK;
|
|
}
|
|
if (irqs & (1 << GB_IRQ_LCDSTAT)) {
|
|
gb->memory.io[GB_REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
|
|
return GB_VECTOR_LCDSTAT;
|
|
}
|
|
if (irqs & (1 << GB_IRQ_TIMER)) {
|
|
gb->memory.io[GB_REG_IF] &= ~(1 << GB_IRQ_TIMER);
|
|
return GB_VECTOR_TIMER;
|
|
}
|
|
if (irqs & (1 << GB_IRQ_SIO)) {
|
|
gb->memory.io[GB_REG_IF] &= ~(1 << GB_IRQ_SIO);
|
|
return GB_VECTOR_SIO;
|
|
}
|
|
if (irqs & (1 << GB_IRQ_KEYPAD)) {
|
|
gb->memory.io[GB_REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
|
|
return GB_VECTOR_KEYPAD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void _enableInterrupts(struct mTiming* timing, void* user, uint32_t cyclesLate) {
|
|
UNUSED(timing);
|
|
UNUSED(cyclesLate);
|
|
struct GB* gb = user;
|
|
gb->memory.ime = true;
|
|
GBUpdateIRQs(gb);
|
|
}
|
|
|
|
void GBHalt(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
if (!(gb->memory.ie & gb->memory.io[GB_REG_IF] & 0x1F)) {
|
|
cpu->cycles = cpu->nextEvent;
|
|
cpu->halted = true;
|
|
} else if (!gb->memory.ime) {
|
|
mLOG(GB, GAME_ERROR, "HALT bug");
|
|
cpu->executionState = SM83_CORE_HALT_BUG;
|
|
}
|
|
}
|
|
|
|
void GBStop(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
if (gb->model >= GB_MODEL_CGB && gb->memory.io[GB_REG_KEY1] & 1) {
|
|
gb->doubleSpeed ^= 1;
|
|
gb->cpu->tMultiplier = 2 - gb->doubleSpeed;
|
|
gb->memory.io[GB_REG_KEY1] = 0;
|
|
gb->memory.io[GB_REG_KEY1] |= gb->doubleSpeed << 7;
|
|
} else {
|
|
int sleep = ~(gb->memory.io[GB_REG_JOYP] & 0x30);
|
|
size_t c;
|
|
for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
|
|
struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
|
|
if (sleep && callbacks->sleep) {
|
|
callbacks->sleep(callbacks->context);
|
|
} else if (callbacks->shutdown) {
|
|
callbacks->shutdown(callbacks->context);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void GBIllegal(struct SM83Core* cpu) {
|
|
struct GB* gb = (struct GB*) cpu->master;
|
|
mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X", cpu->pc, cpu->bus);
|
|
#ifdef USE_DEBUGGERS
|
|
if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
|
|
struct mDebuggerEntryInfo info = {
|
|
.address = cpu->pc,
|
|
.type.bp.opcode = cpu->bus
|
|
};
|
|
mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
|
|
}
|
|
#endif
|
|
// Hang forever
|
|
gb->memory.ime = 0;
|
|
--cpu->pc;
|
|
}
|
|
|
|
bool GBIsROM(struct VFile* vf) {
|
|
if (!vf) {
|
|
return false;
|
|
}
|
|
vf->seek(vf, 0x100, SEEK_SET);
|
|
uint8_t header[0x100];
|
|
|
|
if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
|
|
return false;
|
|
}
|
|
if (memcmp(&header[4], _knownHeader, sizeof(_knownHeader)) == 0) {
|
|
return true;
|
|
}
|
|
if (memcmp(&header[4], _knownHeaderSachen, sizeof(_knownHeaderSachen)) == 0) {
|
|
// Sachen logo
|
|
return true;
|
|
}
|
|
if (header[0x04] == _knownHeader[0] && header[0x44] == _knownHeader[1] &&
|
|
header[0x14] == _knownHeader[2] && header[0x54] == _knownHeader[3]) {
|
|
// Sachen MMC1 scrambled header
|
|
return true;
|
|
}
|
|
if (header[0x04] == _knownHeaderSachen[0] && header[0x44] == _knownHeaderSachen[1] &&
|
|
header[0x14] == _knownHeaderSachen[2] && header[0x54] == _knownHeaderSachen[3]) {
|
|
// Sachen MMC2 scrambled header
|
|
return true;
|
|
}
|
|
|
|
uint8_t footer[16];
|
|
vf->seek(vf, -sizeof(footer), SEEK_END);
|
|
if (vf->read(vf, footer, sizeof(footer)) < (ssize_t) sizeof(footer)) {
|
|
return false;
|
|
}
|
|
uint32_t size;
|
|
uint32_t vers;
|
|
LOAD_32BE(size, 0, footer);
|
|
LOAD_32BE(vers, 4, footer);
|
|
if (memcmp(&footer[12], "GBX!", 4) == 0 && size == 0x40 && vers == 1) {
|
|
// GBX file
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void GBGetGameTitle(const struct GB* gb, char* out) {
|
|
const struct GBCartridge* cart = NULL;
|
|
if (gb->memory.rom) {
|
|
cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
|
|
}
|
|
if (!cart) {
|
|
return;
|
|
}
|
|
if (cart->oldLicensee != 0x33) {
|
|
memcpy(out, cart->titleLong, 16);
|
|
} else {
|
|
memcpy(out, cart->titleShort, 11);
|
|
}
|
|
}
|
|
|
|
void GBGetGameCode(const struct GB* gb, char* out) {
|
|
memset(out, 0, 8);
|
|
const struct GBCartridge* cart = NULL;
|
|
if (gb->memory.rom) {
|
|
cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
|
|
}
|
|
if (!cart) {
|
|
return;
|
|
}
|
|
if (cart->cgb == 0xC0) {
|
|
memcpy(out, "CGB-????", 8);
|
|
} else {
|
|
memcpy(out, "DMG-????", 8);
|
|
}
|
|
if (cart->oldLicensee == 0x33) {
|
|
memcpy(&out[4], cart->maker, 4);
|
|
}
|
|
}
|
|
|
|
void GBFrameStarted(struct GB* gb) {
|
|
GBTestKeypadIRQ(gb);
|
|
|
|
size_t c;
|
|
for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
|
|
struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
|
|
if (callbacks->videoFrameStarted) {
|
|
callbacks->videoFrameStarted(callbacks->context);
|
|
}
|
|
}
|
|
}
|
|
|
|
void GBFrameEnded(struct GB* gb) {
|
|
GBSramClean(gb, gb->video.frameCounter);
|
|
|
|
if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
|
|
struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
|
|
size_t i;
|
|
for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
|
|
struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
|
|
mCheatRefresh(device, cheats);
|
|
}
|
|
}
|
|
|
|
// TODO: Move to common code
|
|
if (gb->stream && gb->stream->postVideoFrame) {
|
|
const color_t* pixels;
|
|
size_t stride;
|
|
gb->video.renderer->getPixels(gb->video.renderer, &stride, (const void**) &pixels);
|
|
gb->stream->postVideoFrame(gb->stream, pixels, stride);
|
|
}
|
|
|
|
size_t c;
|
|
for (c = 0; c < mCoreCallbacksListSize(&gb->coreCallbacks); ++c) {
|
|
struct mCoreCallbacks* callbacks = mCoreCallbacksListGetPointer(&gb->coreCallbacks, c);
|
|
if (callbacks->videoFrameEnded) {
|
|
callbacks->videoFrameEnded(callbacks->context);
|
|
}
|
|
}
|
|
}
|
|
|
|
enum GBModel GBNameToModel(const char* model) {
|
|
if (strcasecmp(model, "DMG") == 0 || strcasecmp(model, "GB") == 0) {
|
|
return GB_MODEL_DMG;
|
|
} else if (strcasecmp(model, "CGB") == 0 || strcasecmp(model, "GBC") == 0) {
|
|
return GB_MODEL_CGB;
|
|
} else if (strcasecmp(model, "AGB") == 0 || strcasecmp(model, "GBA") == 0) {
|
|
return GB_MODEL_AGB;
|
|
} else if (strcasecmp(model, "SGB") == 0) {
|
|
return GB_MODEL_SGB;
|
|
} else if (strcasecmp(model, "MGB") == 0) {
|
|
return GB_MODEL_MGB;
|
|
} else if (strcasecmp(model, "SGB2") == 0) {
|
|
return GB_MODEL_SGB2;
|
|
} else if (strcasecmp(model, "SCGB") == 0 || strcasecmp(model, "SGBC") == 0) {
|
|
return GB_MODEL_SCGB;
|
|
}
|
|
return GB_MODEL_AUTODETECT;
|
|
}
|
|
|
|
const char* GBModelToName(enum GBModel model) {
|
|
switch (model) {
|
|
case GB_MODEL_DMG:
|
|
return "DMG";
|
|
case GB_MODEL_SGB:
|
|
return "SGB";
|
|
case GB_MODEL_MGB:
|
|
return "MGB";
|
|
case GB_MODEL_SGB2:
|
|
return "SGB2";
|
|
case GB_MODEL_CGB:
|
|
return "CGB";
|
|
case GB_MODEL_AGB:
|
|
return "AGB";
|
|
case GB_MODEL_SCGB:
|
|
return "SCGB";
|
|
default:
|
|
case GB_MODEL_AUTODETECT:
|
|
return NULL;
|
|
}
|
|
}
|