mirror of https://github.com/bsnes-emu/bsnes.git
97 lines
2.3 KiB
C++
97 lines
2.3 KiB
C++
auto SuperFX::read(uint24 addr, uint8 data) -> uint8 {
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if((addr & 0xc00000) == 0x000000) { //$00-3f:0000-7fff,:8000-ffff
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while(!regs.scmr.ron) {
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step(6);
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synchronize(cpu);
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}
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return rom.read((((addr & 0x3f0000) >> 1) | (addr & 0x7fff)) & romMask);
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}
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if((addr & 0xe00000) == 0x400000) { //$40-5f:0000-ffff
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while(!regs.scmr.ron) {
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step(6);
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synchronize(cpu);
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}
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return rom.read(addr & romMask);
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}
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if((addr & 0xe00000) == 0x600000) { //$60-7f:0000-ffff
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while(!regs.scmr.ran) {
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step(6);
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synchronize(cpu);
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}
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return ram.read(addr & ramMask);
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}
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return data;
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}
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auto SuperFX::write(uint24 addr, uint8 data) -> void {
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if((addr & 0xe00000) == 0x600000) { //$60-7f:0000-ffff
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while(!regs.scmr.ran) {
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step(6);
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synchronize(cpu);
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}
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return ram.write(addr & ramMask, data);
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}
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}
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auto SuperFX::readOpcode(uint16 addr) -> uint8 {
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uint16 offset = addr - regs.cbr;
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if(offset < 512) {
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if(cache.valid[offset >> 4] == false) {
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uint dp = offset & 0xfff0;
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uint sp = (regs.pbr << 16) + ((regs.cbr + dp) & 0xfff0);
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for(uint n : range(16)) {
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step(regs.clsr ? 5 : 6);
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cache.buffer[dp++] = read(sp++);
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}
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cache.valid[offset >> 4] = true;
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} else {
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step(regs.clsr ? 1 : 2);
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}
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return cache.buffer[offset];
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}
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if(regs.pbr <= 0x5f) {
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//$00-5f:0000-ffff ROM
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syncROMBuffer();
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step(regs.clsr ? 5 : 6);
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return read(regs.pbr << 16 | addr);
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} else {
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//$60-7f:0000-ffff RAM
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syncRAMBuffer();
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step(regs.clsr ? 5 : 6);
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return read(regs.pbr << 16 | addr);
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}
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}
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auto SuperFX::peekpipe() -> uint8 {
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uint8 result = regs.pipeline;
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regs.pipeline = readOpcode(regs.r[15]);
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regs.r[15].modified = false;
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return result;
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}
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auto SuperFX::pipe() -> uint8 {
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uint8 result = regs.pipeline;
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regs.pipeline = readOpcode(++regs.r[15]);
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regs.r[15].modified = false;
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return result;
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}
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auto SuperFX::flushCache() -> void {
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for(uint n : range(32)) cache.valid[n] = false;
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}
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auto SuperFX::readCache(uint16 addr) -> uint8 {
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addr = (addr + regs.cbr) & 511;
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return cache.buffer[addr];
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}
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auto SuperFX::writeCache(uint16 addr, uint8 data) -> void {
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addr = (addr + regs.cbr) & 511;
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cache.buffer[addr] = data;
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if((addr & 15) == 15) cache.valid[addr >> 4] = true;
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}
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