102 lines
2.5 KiB
C++
Executable File
102 lines
2.5 KiB
C++
Executable File
#ifdef BSX_CPP
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void BSXCart::init() {
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}
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void BSXCart::enable() {
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for(uint16 i = 0x5000; i <= 0x5fff; i++) memory::mmio.map(i, *this);
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}
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void BSXCart::power() {
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reset();
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}
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void BSXCart::reset() {
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for(unsigned i = 0; i < 16; i++) regs.r[i] = 0x00;
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regs.r[0x07] = 0x80;
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regs.r[0x08] = 0x80;
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update_memory_map();
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}
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void BSXCart::update_memory_map() {
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Memory &cart = (regs.r[0x01] & 0x80) == 0x00 ? (Memory&)bsxflash : (Memory&)psram;
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if((regs.r[0x02] & 0x80) == 0x00) {
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//LoROM mapping
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bus.map(Bus::MapLinear, 0x00, 0x7d, 0x8000, 0xffff, cart);
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bus.map(Bus::MapLinear, 0x80, 0xff, 0x8000, 0xffff, cart);
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} else {
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//HiROM mapping
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bus.map(Bus::MapShadow, 0x00, 0x3f, 0x8000, 0xffff, cart);
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bus.map(Bus::MapLinear, 0x40, 0x7d, 0x0000, 0xffff, cart);
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bus.map(Bus::MapShadow, 0x80, 0xbf, 0x8000, 0xffff, cart);
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bus.map(Bus::MapLinear, 0xc0, 0xff, 0x0000, 0xffff, cart);
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}
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if(regs.r[0x03] & 0x80) {
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bus.map(Bus::MapLinear, 0x60, 0x6f, 0x0000, 0xffff, psram);
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//bus.map(Bus::MapLinear, 0x70, 0x77, 0x0000, 0xffff, psram);
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}
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if((regs.r[0x05] & 0x80) == 0x00) {
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bus.map(Bus::MapLinear, 0x40, 0x4f, 0x0000, 0xffff, psram);
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}
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if((regs.r[0x06] & 0x80) == 0x00) {
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bus.map(Bus::MapLinear, 0x50, 0x5f, 0x0000, 0xffff, psram);
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}
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if(regs.r[0x07] & 0x80) {
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bus.map(Bus::MapLinear, 0x00, 0x1f, 0x8000, 0xffff, memory::cartrom);
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}
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if(regs.r[0x08] & 0x80) {
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bus.map(Bus::MapLinear, 0x80, 0x9f, 0x8000, 0xffff, memory::cartrom);
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}
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bus.map(Bus::MapShadow, 0x20, 0x3f, 0x6000, 0x7fff, psram);
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bus.map(Bus::MapLinear, 0x70, 0x77, 0x0000, 0xffff, psram);
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}
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uint8 BSXCart::mmio_read(unsigned addr) {
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if((addr & 0xf0ffff) == 0x005000) { //$[00-0f]:5000 MMIO
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uint8 n = (addr >> 16) & 15;
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return regs.r[n];
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}
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if((addr & 0xf8f000) == 0x105000) { //$[10-17]:[5000-5fff] SRAM
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return sram.read(((addr >> 16) & 7) * 0x1000 + (addr & 0xfff));
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}
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return 0x00;
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}
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void BSXCart::mmio_write(unsigned addr, uint8 data) {
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if((addr & 0xf0ffff) == 0x005000) { //$[00-0f]:5000 MMIO
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uint8 n = (addr >> 16) & 15;
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regs.r[n] = data;
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if(n == 0x0e && data & 0x80) update_memory_map();
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return;
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}
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if((addr & 0xf8f000) == 0x105000) { //$[10-17]:[5000-5fff] SRAM
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return sram.write(((addr >> 16) & 7) * 0x1000 + (addr & 0xfff), data);
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}
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}
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BSXCart::BSXCart() {
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sram_data = new uint8_t[ 32 * 1024];
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psram_data = new uint8_t[512 * 1024];
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sram.map (sram_data, 32 * 1024);
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psram.map(psram_data, 512 * 1024);
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}
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BSXCart::~BSXCart() {
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delete[] sram_data;
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delete[] psram_data;
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}
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#endif
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