mirror of https://github.com/bsnes-emu/bsnes.git
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
auto CPU::iwram_read(uint mode, uint32 addr) -> uint32 {
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if(regs.memory.control.disable) return cpu.pipeline.fetch.instruction;
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if(mode & Word) return iwram_read(Half, addr &~ 2) << 0 | iwram_read(Half, addr | 2) << 16;
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if(mode & Half) return iwram_read(Byte, addr &~ 1) << 0 | iwram_read(Byte, addr | 1) << 8;
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return iwram[addr & 0x7fff];
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}
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auto CPU::iwram_write(uint mode, uint32 addr, uint32 word) -> void {
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if(regs.memory.control.disable) return;
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if(mode & Word) {
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iwram_write(Half, addr &~2, word >> 0);
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iwram_write(Half, addr | 2, word >> 16);
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return;
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}
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if(mode & Half) {
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iwram_write(Byte, addr &~1, word >> 0);
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iwram_write(Byte, addr | 1, word >> 8);
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return;
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}
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iwram[addr & 0x7fff] = word;
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}
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auto CPU::ewram_read(uint mode, uint32 addr) -> uint32 {
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if(regs.memory.control.disable) return cpu.pipeline.fetch.instruction;
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if(!regs.memory.control.ewram) return iwram_read(mode, addr);
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if(mode & Word) return ewram_read(Half, addr &~ 2) << 0 | ewram_read(Half, addr | 2) << 16;
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if(mode & Half) return ewram_read(Byte, addr &~ 1) << 0 | ewram_read(Byte, addr | 1) << 8;
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return ewram[addr & 0x3ffff];
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}
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auto CPU::ewram_write(uint mode, uint32 addr, uint32 word) -> void {
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if(regs.memory.control.disable) return;
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if(!regs.memory.control.ewram) return iwram_write(mode, addr, word);
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if(mode & Word) {
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ewram_write(Half, addr &~2, word >> 0);
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ewram_write(Half, addr | 2, word >> 16);
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return;
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}
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if(mode & Half) {
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ewram_write(Byte, addr &~1, word >> 0);
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ewram_write(Byte, addr | 1, word >> 8);
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return;
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}
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ewram[addr & 0x3ffff] = word;
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}
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