mirror of https://github.com/bsnes-emu/bsnes.git
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
#include <sfc/sfc.hpp>
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namespace SuperFamicom {
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Bus bus;
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Bus::Bus() {
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lookup = new uint8 [16 * 1024 * 1024];
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target = new uint32[16 * 1024 * 1024];
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}
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Bus::~Bus() {
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delete[] lookup;
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delete[] target;
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}
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auto Bus::reset() -> void {
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function<auto (uint24, uint8) -> uint8> reader = [](uint24, uint8 data) { return data; };
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function<auto (uint24, uint8) -> void> writer = [](uint24, uint8) {};
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idcount = 0;
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map(reader, writer, 0x00, 0xff, 0x0000, 0xffff);
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}
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auto Bus::map() -> void {
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for(auto& m : cartridge.mapping) {
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lstring part = m.addr.split(":", 1L);
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lstring banks = part(0).split(",");
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lstring addrs = part(1).split(",");
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for(auto& bank : banks) {
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for(auto& addr : addrs) {
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lstring bankpart = bank.split("-", 1L);
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lstring addrpart = addr.split("-", 1L);
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uint banklo = hex(bankpart(0));
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uint bankhi = hex(bankpart(1, bankpart(0)));
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uint addrlo = hex(addrpart(0));
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uint addrhi = hex(addrpart(1, addrpart(0)));
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map(m.reader, m.writer, banklo, bankhi, addrlo, addrhi, m.size, m.base, m.mask);
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}
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}
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}
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}
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auto Bus::map(
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const function<uint8 (uint24, uint8)>& reader,
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const function<void (uint24, uint8)>& writer,
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uint8 banklo, uint8 bankhi, uint16 addrlo, uint16 addrhi,
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uint size, uint base, uint mask
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) -> void {
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assert(banklo <= bankhi);
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assert(addrlo <= addrhi);
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assert(idcount < 255);
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uint id = idcount++;
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this->reader[id] = reader;
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this->writer[id] = writer;
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for(uint bank = banklo; bank <= bankhi; bank++) {
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for(uint addr = addrlo; addr <= addrhi; addr++) {
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uint offset = reduce(bank << 16 | addr, mask);
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if(size) offset = base + mirror(offset, size - base);
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lookup[bank << 16 | addr] = id;
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target[bank << 16 | addr] = offset;
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}
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}
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}
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}
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