mirror of https://github.com/bsnes-emu/bsnes.git
26 lines
741 B
C++
26 lines
741 B
C++
BIOS::BIOS() {
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size = 16384;
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data = new uint8[size]();
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}
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BIOS::~BIOS() {
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delete[] data;
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}
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auto BIOS::read(uint mode, uint32 addr) -> uint32 {
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//unmapped memory
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if(addr >= 0x0000'4000) return cpu.pipeline.fetch.instruction; //0000'4000-01ff'ffff
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//GBA BIOS is read-protected; only the BIOS itself can read its own memory
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//when accessed elsewhere; this should return the last value read by the BIOS program
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if(cpu.r(15) >= 0x0000'4000) return mdr;
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if(mode & Word) return mdr = read(Half, addr &~ 2) << 0 | read(Half, addr | 2) << 16;
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if(mode & Half) return mdr = read(Byte, addr &~ 1) << 0 | read(Byte, addr | 1) << 8;
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return mdr = data[addr];
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}
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auto BIOS::write(uint mode, uint32 addr, uint32 word) -> void {
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}
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