mirror of https://github.com/bsnes-emu/bsnes.git
125 lines
2.5 KiB
C++
125 lines
2.5 KiB
C++
#include <sfc/sfc.hpp>
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namespace SuperFamicom {
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BSMemory bsmemory;
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auto BSMemory::init() -> void {
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}
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auto BSMemory::load() -> void {
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if(memory.size() == 0) {
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memory.allocate(1024 * 1024);
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}
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}
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auto BSMemory::unload() -> void {
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memory.reset();
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}
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auto BSMemory::power() -> void {
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regs.command = 0;
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regs.writeOld = 0x00;
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regs.writeNew = 0x00;
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regs.flashEnable = false;
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regs.readEnable = false;
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regs.writeEnable = false;
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memory.writeProtect(!regs.writeEnable);
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}
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auto BSMemory::size() const -> uint {
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return memory.size();
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}
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auto BSMemory::read(uint24 addr, uint8 data) -> uint8 {
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if(readonly) {
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return memory.read(bus.mirror(addr, memory.size()), data);
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}
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if(addr == 0x0002) {
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if(regs.flashEnable) return 0x80;
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}
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if(addr == 0x5555) {
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if(regs.flashEnable) return 0x80;
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}
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if(regs.readEnable && addr >= 0xff00 && addr <= 0xff13) {
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//read flash cartridge vendor information
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switch(addr - 0xff00) {
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case 0x00: return 0x4d;
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case 0x01: return 0x00;
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case 0x02: return 0x50;
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case 0x03: return 0x00;
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case 0x04: return 0x00;
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case 0x05: return 0x00;
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case 0x06: return 0x2a; //0x2a = 8mbit, 0x2b = 16mbit (not known to exist, though BIOS recognizes ID)
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case 0x07: return 0x00;
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default: return 0x00;
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}
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}
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return memory.read(addr, data);
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}
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auto BSMemory::write(uint24 addr, uint8 data) -> void {
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if(readonly) {
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return;
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}
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if((addr & 0xff0000) == 0) {
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regs.writeOld = regs.writeNew;
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regs.writeNew = data;
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if(regs.writeEnable && regs.writeOld == regs.writeNew) {
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return memory.write(addr, data);
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}
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} else {
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if(regs.writeEnable) {
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return memory.write(addr, data);
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}
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}
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if(addr == 0x0000) {
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regs.command <<= 8;
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regs.command |= data;
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if((regs.command & 0xffff) == 0x38d0) {
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regs.flashEnable = true;
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regs.readEnable = true;
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}
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}
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if(addr == 0x2aaa) {
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regs.command <<= 8;
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regs.command |= data;
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}
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if(addr == 0x5555) {
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regs.command <<= 8;
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regs.command |= data;
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if((regs.command & 0xffffff) == 0xaa5570) {
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regs.writeEnable = false;
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}
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if((regs.command & 0xffffff) == 0xaa55a0) {
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regs.writeOld = 0x00;
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regs.writeNew = 0x00;
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regs.flashEnable = true;
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regs.writeEnable = true;
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}
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if((regs.command & 0xffffff) == 0xaa55f0) {
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regs.flashEnable = false;
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regs.readEnable = false;
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regs.writeEnable = false;
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}
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memory.writeProtect(!regs.writeEnable);
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}
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}
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}
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