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https://github.com/bsnes-emu/bsnes.git
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926a39d701
byuu says: Changelog: - GB/C OAM DMA now runs in parallel with the CPU - CPU can only access HRAM during OAM DMA - fixed SGB mode again - brand new config files will default to the optimal drivers now (OpenGL, etc) instead of the safest - hopefully fixed remaining Windows UI issues
48 lines
990 B
C++
48 lines
990 B
C++
#ifdef CPU_CPP
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void CPU::op_io() {
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cycle_edge();
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add_clocks(4);
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}
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uint8 CPU::op_read(uint16 addr) {
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cycle_edge();
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add_clocks(4);
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if(oamdma.active) return hram[addr & 0x7f];
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return bus.read(addr);
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}
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void CPU::op_write(uint16 addr, uint8 data) {
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cycle_edge();
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add_clocks(4);
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if(oamdma.active) hram[addr & 0x7f] = data;
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else bus.write(addr, data);
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}
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void CPU::cycle_edge() {
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if(r.ei) {
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r.ei = false;
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r.ime = 1;
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}
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}
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//VRAM DMA source can only be ROM or RAM
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uint8 CPU::dma_read(uint16 addr) {
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if(addr < 0x8000) return bus.read(addr); //0000-7fff
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if(addr < 0xa000) return 0x00; //8000-9fff
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if(addr < 0xe000) return bus.read(addr); //a000-dfff
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return 0x00; //e000-ffff
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}
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//VRAM DMA target is always VRAM
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void CPU::dma_write(uint16 addr, uint8 data) {
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addr = 0x8000 | (addr & 0x1fff); //8000-9fff
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return bus.write(addr, data);
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}
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uint8 CPU::debugger_read(uint16 addr) {
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return bus.read(addr);
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}
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#endif
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