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More accurate DMA write conflicts

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This commit is contained in:
Lior Halphon 2022-02-13 12:56:16 +02:00
parent c730ba767b
commit efe31cefc9
1 changed files with 12 additions and 10 deletions
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22
Core/memory.c
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@ -255,9 +255,9 @@ static bool is_addr_in_dma_use(GB_gameboy_t *gb, uint16_t addr)
if (gb->dma_current_dest == 0xFF || gb->dma_current_dest == 0x0) return false; // Warm up
if (addr >= 0xfe00) return false;
if (gb->dma_current_src == addr) return false; // Shortcut for DMA access flow
if (gb->dma_current_src > 0xe000 && (gb->dma_current_src & ~0x2000) == addr) return false;
if (gb->dma_current_src >= 0xe000 && (gb->dma_current_src & ~0x2000) == addr) return false;
if (GB_is_cgb(gb)) {
if (addr >= 0xe000) {
if (addr >= 0xc000) {
return bus_for_addr(gb, gb->dma_current_src) != GB_BUS_VRAM;
}
if (gb->dma_current_src >= 0xe000) {
@ -485,7 +485,7 @@ internal uint8_t GB_read_oam(GB_gameboy_t *gb, uint8_t addr)
return (addr & 0xF0) | (addr >> 4);
case GB_MODEL_CGB_D:
if (addr > 0xc0) {
if (addr >= 0xc0) {
addr |= 0xf0;
}
return gb->extra_oam[addr - 0xa0];
@ -752,7 +752,7 @@ uint8_t GB_read_memory(GB_gameboy_t *gb, uint16_t addr)
// TODO: this should probably affect the DMA dest as well
addr = ((gb->dma_current_src - 1) & 0x1000) | (addr & 0xFFF) | 0xC000;
}
else if (GB_is_cgb(gb) && gb->dma_current_src >= 0xe000 && addr > 0xc000) {
else if (GB_is_cgb(gb) && gb->dma_current_src >= 0xe000 && addr >= 0xc000) {
// TODO: this should probably affect the DMA dest as well
addr = ((gb->dma_current_src - 1) & 0x1000) | (addr & 0xFFF) | 0xC000;
}
@ -1206,7 +1206,7 @@ static void write_oam(GB_gameboy_t *gb, uint8_t addr, uint8_t value)
}
switch (gb->model) {
case GB_MODEL_CGB_D:
if (addr > 0xc0) {
if (addr >= 0xc0) {
addr |= 0xf0;
}
gb->extra_oam[addr - 0xa0] = value;
@ -1661,19 +1661,20 @@ void GB_write_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
return;
}
if (GB_is_cgb(gb) && bus_for_addr(gb, gb->dma_current_src) != GB_BUS_RAM && addr >= 0xc000) {
if (GB_is_cgb(gb) && (gb->dma_current_src < 0xc000 || gb->dma_current_src >= 0xe000) && addr >= 0xc000) {
// TODO: this should probably affect the DMA dest as well
addr = ((gb->dma_current_src - 1) & 0x1000) | (addr & 0xFFF) | 0xC000;
goto write;
}
else if (GB_is_cgb(gb) && gb->dma_current_src >= 0xe000 && addr > 0xc000) {
else if (GB_is_cgb(gb) && gb->dma_current_src >= 0xe000 && addr >= 0xc000) {
// TODO: this should probably affect the DMA dest as well
addr = ((gb->dma_current_src - 1) & 0x1000) | (addr & 0xFFF) | 0xC000;
}
else {
addr = (gb->dma_current_src - 1);
}
if (GB_is_cgb(gb) || addr > 0xc000) {
if (addr < 0xc000) {
if (GB_is_cgb(gb) || addr >= 0xa000) {
if (addr < 0xa000) {
gb->oam[gb->dma_current_dest - 1] = 0;
}
else if ((gb->model < GB_MODEL_CGB_0 || gb->model == GB_MODEL_CGB_B)) {
@ -1682,9 +1683,10 @@ void GB_write_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
else if ((gb->model < GB_MODEL_CGB_C || gb->model > GB_MODEL_CGB_E) && !oam_write) {
gb->oam[gb->dma_current_dest - 1] = value;
}
if (gb->model < GB_MODEL_CGB_E || addr >= 0xc000) return;
if (gb->model < GB_MODEL_CGB_E || addr >= 0xa000) return;
}
}
write:
write_map[addr >> 12](gb, addr, value);
}