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GB Memory: Fix OAM DMA blocking regions (fixes #1013)

This commit is contained in:
Vicki Pfau 2018-03-21 09:11:24 -07:00
parent 35716a0895
commit fac10eae96
3 changed files with 32 additions and 28 deletions
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1
CHANGES
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@ -53,6 +53,7 @@ Bugfixes:
- GBA: Fix SharkPort saves for EEPROM games
- Qt: Fix opening in fullscreen (fixes mgba.io/i/993)
- Python: Fix package directory
- GB Memory: Fix OAM DMA blocking regions (fixes mgba.io/i/1013)
Misc:
- GBA Timer: Use global cycles for timers
- GBA: Extend oddly-sized ROMs to full address space (fixes mgba.io/i/722)

1
include/mgba/internal/gb/video.h
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@ -26,7 +26,6 @@ enum {
GB_VIDEO_HORIZONTAL_LENGTH = 456,
GB_VIDEO_MODE_1_LENGTH = 65664,
GB_VIDEO_TOTAL_LENGTH = 70224,
GB_BASE_MAP = 0x1800,

58
src/gb/memory.c
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@ -16,31 +16,33 @@
mLOG_DEFINE_CATEGORY(GB_MEM, "GB Memory", "gb.memory");
struct OAMBlock {
uint16_t low;
uint16_t high;
enum GBBus {
GB_BUS_CPU,
GB_BUS_MAIN,
GB_BUS_VRAM,
GB_BUS_RAM
};
static const struct OAMBlock _oamBlockDMG[] = {
{ 0xA000, 0xFE00 },
{ 0xA000, 0xFE00 },
{ 0xA000, 0xFE00 },
{ 0xA000, 0xFE00 },
{ 0x8000, 0xA000 },
{ 0xA000, 0xFE00 },
{ 0xA000, 0xFE00 },
{ 0xA000, 0xFE00 },
static const enum GBBus _oamBlockDMG[] = {
GB_BUS_MAIN, // 0x0000
GB_BUS_MAIN, // 0x2000
GB_BUS_MAIN, // 0x4000
GB_BUS_MAIN, // 0x6000
GB_BUS_VRAM, // 0x8000
GB_BUS_MAIN, // 0xA000
GB_BUS_MAIN, // 0xC000
GB_BUS_CPU, // 0xE000
};
static const struct OAMBlock _oamBlockCGB[] = {
{ 0xA000, 0xC000 },
{ 0xA000, 0xC000 },
{ 0xA000, 0xC000 },
{ 0xA000, 0xC000 },
{ 0x8000, 0xA000 },
{ 0xA000, 0xC000 },
{ 0xC000, 0xFE00 },
{ 0xA000, 0xC000 },
static const enum GBBus _oamBlockCGB[] = {
GB_BUS_MAIN, // 0x0000
GB_BUS_MAIN, // 0x2000
GB_BUS_MAIN, // 0x4000
GB_BUS_MAIN, // 0x6000
GB_BUS_VRAM, // 0x8000
GB_BUS_MAIN, // 0xA000
GB_BUS_RAM, // 0xC000
GB_BUS_CPU // 0xE000
};
static void _pristineCow(struct GB* gba);
@ -192,9 +194,10 @@ uint8_t GBLoad8(struct LR35902Core* cpu, uint16_t address) {
struct GB* gb = (struct GB*) cpu->master;
struct GBMemory* memory = &gb->memory;
if (gb->memory.dmaRemaining) {
const struct OAMBlock* block = gb->model < GB_MODEL_CGB ? _oamBlockDMG : _oamBlockCGB;
block = &block[memory->dmaSource >> 13];
if (address >= block->low && address < block->high) {
const enum GBBus* block = gb->model < GB_MODEL_CGB ? _oamBlockDMG : _oamBlockCGB;
enum GBBus dmaBus = block[memory->dmaSource >> 13];
enum GBBus accessBus = block[address >> 13];
if (dmaBus != GB_BUS_CPU && dmaBus == accessBus) {
return 0xFF;
}
if (address >= GB_BASE_OAM && address < GB_BASE_UNUSABLE) {
@ -264,9 +267,10 @@ void GBStore8(struct LR35902Core* cpu, uint16_t address, int8_t value) {
struct GB* gb = (struct GB*) cpu->master;
struct GBMemory* memory = &gb->memory;
if (gb->memory.dmaRemaining) {
const struct OAMBlock* block = gb->model < GB_MODEL_CGB ? _oamBlockDMG : _oamBlockCGB;
block = &block[memory->dmaSource >> 13];
if (address >= block->low && address < block->high) {
const enum GBBus* block = gb->model < GB_MODEL_CGB ? _oamBlockDMG : _oamBlockCGB;
enum GBBus dmaBus = block[memory->dmaSource >> 13];
enum GBBus accessBus = block[address >> 13];
if (dmaBus != GB_BUS_CPU && dmaBus == accessBus) {
return;
}
if (address >= GB_BASE_OAM && address < GB_BASE_UNUSABLE) {