mirror of
https://github.com/rodamaral/lsnes.git
synced 2025-04-02 10:42:15 -04:00
7379b4570e
Instead of using time() in chip emulation, create new interface method currentTime(), defaulting to time(0). This way frontend can cleanly override the current time bsnes is using.
674 lines
17 KiB
C++
Executable file
674 lines
17 KiB
C++
Executable file
#include <snes/snes.hpp>
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#define SPC7110_CPP
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namespace SNES {
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SPC7110 spc7110;
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#include "serialization.cpp"
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#include "decomp.cpp"
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const unsigned SPC7110::months[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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void SPC7110::init() {
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}
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void SPC7110::load() {
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for(unsigned n = 0; n < 20; n++) rtc[n] = 0xff;
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if(cartridge.has_spc7110rtc()) cartridge.nvram.append({ ".rtc", rtc, 20 });
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}
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void SPC7110::unload() {
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}
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void SPC7110::power() {
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}
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void SPC7110::reset() {
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r4801 = 0x00;
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r4802 = 0x00;
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r4803 = 0x00;
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r4804 = 0x00;
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r4805 = 0x00;
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r4806 = 0x00;
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r4807 = 0x00;
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r4808 = 0x00;
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r4809 = 0x00;
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r480a = 0x00;
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r480b = 0x00;
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r480c = 0x00;
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decomp.reset();
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r4811 = 0x00;
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r4812 = 0x00;
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r4813 = 0x00;
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r4814 = 0x00;
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r4815 = 0x00;
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r4816 = 0x00;
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r4817 = 0x00;
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r4818 = 0x00;
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r481x = 0x00;
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r4814_latch = false;
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r4815_latch = false;
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r4820 = 0x00;
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r4821 = 0x00;
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r4822 = 0x00;
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r4823 = 0x00;
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r4824 = 0x00;
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r4825 = 0x00;
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r4826 = 0x00;
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r4827 = 0x00;
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r4828 = 0x00;
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r4829 = 0x00;
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r482a = 0x00;
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r482b = 0x00;
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r482c = 0x00;
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r482d = 0x00;
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r482e = 0x00;
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r482f = 0x00;
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r4830 = 0x00;
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mmio_write(0x4831, 0);
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mmio_write(0x4832, 1);
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mmio_write(0x4833, 2);
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r4834 = 0x00;
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r4840 = 0x00;
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r4841 = 0x00;
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r4842 = 0x00;
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if(cartridge.has_spc7110rtc()) {
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rtc_state = RTCS_Inactive;
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rtc_mode = RTCM_Linear;
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rtc_index = 0;
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}
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}
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unsigned SPC7110::datarom_addr(unsigned addr) {
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unsigned size = cartridge.rom.size() - data_rom_offset;
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while(addr >= size) addr -= size;
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return data_rom_offset + addr;
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}
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unsigned SPC7110::data_pointer() { return r4811 + (r4812 << 8) + (r4813 << 16); }
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unsigned SPC7110::data_adjust() { return r4814 + (r4815 << 8); }
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unsigned SPC7110::data_increment() { return r4816 + (r4817 << 8); }
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void SPC7110::set_data_pointer(unsigned addr) { r4811 = addr; r4812 = addr >> 8; r4813 = addr >> 16; }
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void SPC7110::set_data_adjust(unsigned addr) { r4814 = addr; r4815 = addr >> 8; }
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void SPC7110::update_time(int offset) {
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time_t rtc_time = (rtc[16] << 0) | (rtc[17] << 8) | (rtc[18] << 16) | (rtc[19] << 24);
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time_t current_time = SNES::interface->currentTime() - offset;
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//sizeof(time_t) is platform-dependent; though rtc[] needs to be platform-agnostic.
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//yet platforms with 32-bit signed time_t will overflow every ~68 years. handle this by
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//accounting for overflow at the cost of 1-bit precision (to catch underflow). this will allow
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//rtc[] timestamp to remain valid for up to ~34 years from the last update, even if
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//time_t overflows. calculation should be valid regardless of number representation, time_t size,
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//or whether time_t is signed or unsigned.
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time_t diff
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= (current_time >= rtc_time)
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? (current_time - rtc_time)
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: (std::numeric_limits<time_t>::max() - rtc_time + current_time + 1); //compensate for overflow
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if(diff > std::numeric_limits<time_t>::max() / 2) diff = 0; //compensate for underflow
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bool update = true;
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if(rtc[13] & 1) update = false; //do not update if CR0 timer disable flag is set
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if(rtc[15] & 3) update = false; //do not update if CR2 timer disable flags are set
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if(diff > 0 && update == true) {
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unsigned second = rtc[ 0] + rtc[ 1] * 10;
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unsigned minute = rtc[ 2] + rtc[ 3] * 10;
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unsigned hour = rtc[ 4] + rtc[ 5] * 10;
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unsigned day = rtc[ 6] + rtc[ 7] * 10;
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unsigned month = rtc[ 8] + rtc[ 9] * 10;
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unsigned year = rtc[10] + rtc[11] * 10;
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unsigned weekday = rtc[12];
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day--;
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month--;
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year += (year >= 90) ? 1900 : 2000; //range = 1990-2089
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second += diff;
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while(second >= 60) {
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second -= 60;
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minute++;
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if(minute < 60) continue;
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minute = 0;
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hour++;
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if(hour < 24) continue;
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hour = 0;
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day++;
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weekday = (weekday + 1) % 7;
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unsigned days = months[month % 12];
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if(days == 28) {
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bool leapyear = false;
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if((year % 4) == 0) {
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leapyear = true;
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if((year % 100) == 0 && (year % 400) != 0) leapyear = false;
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}
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if(leapyear) days++;
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}
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if(day < days) continue;
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day = 0;
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month++;
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if(month < 12) continue;
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month = 0;
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year++;
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}
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day++;
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month++;
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year %= 100;
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rtc[ 0] = second % 10;
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rtc[ 1] = second / 10;
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rtc[ 2] = minute % 10;
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rtc[ 3] = minute / 10;
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rtc[ 4] = hour % 10;
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rtc[ 5] = hour / 10;
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rtc[ 6] = day % 10;
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rtc[ 7] = day / 10;
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rtc[ 8] = month % 10;
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rtc[ 9] = month / 10;
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rtc[10] = year % 10;
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rtc[11] = (year / 10) % 10;
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rtc[12] = weekday % 7;
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}
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rtc[16] = current_time >> 0;
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rtc[17] = current_time >> 8;
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rtc[18] = current_time >> 16;
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rtc[19] = current_time >> 24;
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}
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uint8 SPC7110::mmio_read(unsigned addr) {
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addr &= 0xffff;
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switch(addr) {
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//==================
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//decompression unit
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//==================
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case 0x4800: {
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uint16 counter = (r4809 + (r480a << 8));
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counter--;
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r4809 = counter;
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r480a = counter >> 8;
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return decomp.read();
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}
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case 0x4801: return r4801;
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case 0x4802: return r4802;
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case 0x4803: return r4803;
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case 0x4804: return r4804;
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case 0x4805: return r4805;
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case 0x4806: return r4806;
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case 0x4807: return r4807;
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case 0x4808: return r4808;
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case 0x4809: return r4809;
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case 0x480a: return r480a;
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case 0x480b: return r480b;
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case 0x480c: {
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uint8 status = r480c;
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r480c &= 0x7f;
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return status;
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}
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//==============
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//data port unit
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//==============
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case 0x4810: {
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if(r481x != 0x07) return 0x00;
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unsigned addr = data_pointer();
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unsigned adjust = data_adjust();
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if(r4818 & 8) adjust = (int16)adjust; //16-bit sign extend
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unsigned adjustaddr = addr;
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if(r4818 & 2) {
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adjustaddr += adjust;
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set_data_adjust(adjust + 1);
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}
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uint8 data = cartridge.rom.read(datarom_addr(adjustaddr));
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if(!(r4818 & 2)) {
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unsigned increment = (r4818 & 1) ? data_increment() : 1;
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if(r4818 & 4) increment = (int16)increment; //16-bit sign extend
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if((r4818 & 16) == 0) {
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set_data_pointer(addr + increment);
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} else {
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set_data_adjust(adjust + increment);
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}
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}
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return data;
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}
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case 0x4811: return r4811;
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case 0x4812: return r4812;
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case 0x4813: return r4813;
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case 0x4814: return r4814;
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case 0x4815: return r4815;
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case 0x4816: return r4816;
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case 0x4817: return r4817;
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case 0x4818: return r4818;
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case 0x481a: {
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if(r481x != 0x07) return 0x00;
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unsigned addr = data_pointer();
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unsigned adjust = data_adjust();
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if(r4818 & 8) adjust = (int16)adjust; //16-bit sign extend
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uint8 data = cartridge.rom.read(datarom_addr(addr + adjust));
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if((r4818 & 0x60) == 0x60) {
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if((r4818 & 16) == 0) {
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set_data_pointer(addr + adjust);
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} else {
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set_data_adjust(adjust + adjust);
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}
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}
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return data;
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}
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//=========
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//math unit
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//=========
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case 0x4820: return r4820;
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case 0x4821: return r4821;
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case 0x4822: return r4822;
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case 0x4823: return r4823;
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case 0x4824: return r4824;
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case 0x4825: return r4825;
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case 0x4826: return r4826;
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case 0x4827: return r4827;
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case 0x4828: return r4828;
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case 0x4829: return r4829;
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case 0x482a: return r482a;
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case 0x482b: return r482b;
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case 0x482c: return r482c;
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case 0x482d: return r482d;
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case 0x482e: return r482e;
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case 0x482f: {
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uint8 status = r482f;
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r482f &= 0x7f;
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return status;
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}
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//===================
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//memory mapping unit
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//===================
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case 0x4830: return r4830;
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case 0x4831: return r4831;
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case 0x4832: return r4832;
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case 0x4833: return r4833;
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case 0x4834: return r4834;
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//====================
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//real-time clock unit
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//====================
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case 0x4840: return r4840;
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case 0x4841: {
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if(rtc_state == RTCS_Inactive || rtc_state == RTCS_ModeSelect) return 0x00;
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r4842 = 0x80;
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uint8 data = rtc[rtc_index];
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rtc_index = (rtc_index + 1) & 15;
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return data;
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}
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case 0x4842: {
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uint8 status = r4842;
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r4842 &= 0x7f;
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return status;
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}
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}
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return cpu.regs.mdr;
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}
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void SPC7110::mmio_write(unsigned addr, uint8 data) {
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addr &= 0xffff;
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switch(addr) {
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//==================
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//decompression unit
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//==================
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case 0x4801: r4801 = data; break;
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case 0x4802: r4802 = data; break;
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case 0x4803: r4803 = data; break;
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case 0x4804: r4804 = data; break;
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case 0x4805: r4805 = data; break;
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case 0x4806: {
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r4806 = data;
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unsigned table = (r4801 + (r4802 << 8) + (r4803 << 16));
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unsigned index = (r4804 << 2);
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unsigned length = (r4809 + (r480a << 8));
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unsigned addr = datarom_addr(table + index);
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unsigned mode = (cartridge.rom.read(addr + 0));
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unsigned offset = (cartridge.rom.read(addr + 1) << 16)
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+ (cartridge.rom.read(addr + 2) << 8)
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+ (cartridge.rom.read(addr + 3) << 0);
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decomp.init(mode, offset, (r4805 + (r4806 << 8)) << mode);
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r480c = 0x80;
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} break;
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case 0x4807: r4807 = data; break;
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case 0x4808: r4808 = data; break;
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case 0x4809: r4809 = data; break;
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case 0x480a: r480a = data; break;
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case 0x480b: r480b = data; break;
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//==============
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//data port unit
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//==============
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case 0x4811: r4811 = data; r481x |= 0x01; break;
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case 0x4812: r4812 = data; r481x |= 0x02; break;
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case 0x4813: r4813 = data; r481x |= 0x04; break;
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case 0x4814: {
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r4814 = data;
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r4814_latch = true;
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if(!r4815_latch) break;
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if(!(r4818 & 2)) break;
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if(r4818 & 0x10) break;
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if((r4818 & 0x60) == 0x20) {
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unsigned increment = data_adjust() & 0xff;
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if(r4818 & 8) increment = (int8)increment; //8-bit sign extend
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set_data_pointer(data_pointer() + increment);
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} else if((r4818 & 0x60) == 0x40) {
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unsigned increment = data_adjust();
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if(r4818 & 8) increment = (int16)increment; //16-bit sign extend
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set_data_pointer(data_pointer() + increment);
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}
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} break;
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case 0x4815: {
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r4815 = data;
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r4815_latch = true;
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if(!r4814_latch) break;
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if(!(r4818 & 2)) break;
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if(r4818 & 0x10) break;
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if((r4818 & 0x60) == 0x20) {
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unsigned increment = data_adjust() & 0xff;
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if(r4818 & 8) increment = (int8)increment; //8-bit sign extend
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set_data_pointer(data_pointer() + increment);
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} else if((r4818 & 0x60) == 0x40) {
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unsigned increment = data_adjust();
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if(r4818 & 8) increment = (int16)increment; //16-bit sign extend
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set_data_pointer(data_pointer() + increment);
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}
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} break;
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case 0x4816: r4816 = data; break;
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case 0x4817: r4817 = data; break;
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case 0x4818: {
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if(r481x != 0x07) break;
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r4818 = data;
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r4814_latch = r4815_latch = false;
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} break;
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//=========
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//math unit
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//=========
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case 0x4820: r4820 = data; break;
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case 0x4821: r4821 = data; break;
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case 0x4822: r4822 = data; break;
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case 0x4823: r4823 = data; break;
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case 0x4824: r4824 = data; break;
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case 0x4825: {
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r4825 = data;
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if(r482e & 1) {
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//signed 16-bit x 16-bit multiplication
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int16 r0 = (int16)(r4824 + (r4825 << 8));
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int16 r1 = (int16)(r4820 + (r4821 << 8));
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signed result = r0 * r1;
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r4828 = result;
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r4829 = result >> 8;
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r482a = result >> 16;
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r482b = result >> 24;
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} else {
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//unsigned 16-bit x 16-bit multiplication
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uint16 r0 = (uint16)(r4824 + (r4825 << 8));
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uint16 r1 = (uint16)(r4820 + (r4821 << 8));
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unsigned result = r0 * r1;
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r4828 = result;
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r4829 = result >> 8;
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r482a = result >> 16;
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r482b = result >> 24;
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}
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r482f = 0x80;
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} break;
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case 0x4826: r4826 = data; break;
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case 0x4827: {
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r4827 = data;
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if(r482e & 1) {
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//signed 32-bit x 16-bit division
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int32 dividend = (int32)(r4820 + (r4821 << 8) + (r4822 << 16) + (r4823 << 24));
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int16 divisor = (int16)(r4826 + (r4827 << 8));
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int32 quotient;
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int16 remainder;
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if(divisor) {
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quotient = (int32)(dividend / divisor);
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remainder = (int32)(dividend % divisor);
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} else {
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//illegal division by zero
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quotient = 0;
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remainder = dividend & 0xffff;
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}
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r4828 = quotient;
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r4829 = quotient >> 8;
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r482a = quotient >> 16;
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r482b = quotient >> 24;
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r482c = remainder;
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r482d = remainder >> 8;
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} else {
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//unsigned 32-bit x 16-bit division
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uint32 dividend = (uint32)(r4820 + (r4821 << 8) + (r4822 << 16) + (r4823 << 24));
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uint16 divisor = (uint16)(r4826 + (r4827 << 8));
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uint32 quotient;
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uint16 remainder;
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if(divisor) {
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quotient = (uint32)(dividend / divisor);
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remainder = (uint16)(dividend % divisor);
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} else {
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//illegal division by zero
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quotient = 0;
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remainder = dividend & 0xffff;
|
|
}
|
|
|
|
r4828 = quotient;
|
|
r4829 = quotient >> 8;
|
|
r482a = quotient >> 16;
|
|
r482b = quotient >> 24;
|
|
|
|
r482c = remainder;
|
|
r482d = remainder >> 8;
|
|
}
|
|
|
|
r482f = 0x80;
|
|
} break;
|
|
|
|
case 0x482e: {
|
|
//reset math unit
|
|
r4820 = r4821 = r4822 = r4823 = 0;
|
|
r4824 = r4825 = r4826 = r4827 = 0;
|
|
r4828 = r4829 = r482a = r482b = 0;
|
|
r482c = r482d = 0;
|
|
|
|
r482e = data;
|
|
} break;
|
|
|
|
//===================
|
|
//memory mapping unit
|
|
//===================
|
|
|
|
case 0x4830: r4830 = data; break;
|
|
|
|
case 0x4831: {
|
|
r4831 = data;
|
|
dx_offset = datarom_addr(data * 0x100000);
|
|
} break;
|
|
|
|
case 0x4832: {
|
|
r4832 = data;
|
|
ex_offset = datarom_addr(data * 0x100000);
|
|
} break;
|
|
|
|
case 0x4833: {
|
|
r4833 = data;
|
|
fx_offset = datarom_addr(data * 0x100000);
|
|
} break;
|
|
|
|
case 0x4834: r4834 = data; break;
|
|
|
|
//====================
|
|
//real-time clock unit
|
|
//====================
|
|
|
|
case 0x4840: {
|
|
r4840 = data;
|
|
if(!(r4840 & 1)) {
|
|
//disable RTC
|
|
rtc_state = RTCS_Inactive;
|
|
update_time();
|
|
} else {
|
|
//enable RTC
|
|
r4842 = 0x80;
|
|
rtc_state = RTCS_ModeSelect;
|
|
}
|
|
} break;
|
|
|
|
case 0x4841: {
|
|
r4841 = data;
|
|
|
|
switch(rtc_state) {
|
|
case RTCS_ModeSelect: {
|
|
if(data == RTCM_Linear || data == RTCM_Indexed) {
|
|
r4842 = 0x80;
|
|
rtc_state = RTCS_IndexSelect;
|
|
rtc_mode = (RTC_Mode)data;
|
|
rtc_index = 0;
|
|
}
|
|
} break;
|
|
|
|
case RTCS_IndexSelect: {
|
|
r4842 = 0x80;
|
|
rtc_index = data & 15;
|
|
if(rtc_mode == RTCM_Linear) rtc_state = RTCS_Write;
|
|
} break;
|
|
|
|
case RTCS_Write: {
|
|
r4842 = 0x80;
|
|
|
|
//control register 0
|
|
if(rtc_index == 13) {
|
|
//increment second counter
|
|
if(data & 2) update_time(+1);
|
|
|
|
//round minute counter
|
|
if(data & 8) {
|
|
update_time();
|
|
|
|
unsigned second = rtc[ 0] + rtc[ 1] * 10;
|
|
//clear seconds
|
|
rtc[0] = 0;
|
|
rtc[1] = 0;
|
|
|
|
if(second >= 30) update_time(+60);
|
|
}
|
|
}
|
|
|
|
//control register 2
|
|
if(rtc_index == 15) {
|
|
//disable timer and clear second counter
|
|
if((data & 1) && !(rtc[15] & 1)) {
|
|
update_time();
|
|
|
|
//clear seconds
|
|
rtc[0] = 0;
|
|
rtc[1] = 0;
|
|
}
|
|
|
|
//disable timer
|
|
if((data & 2) && !(rtc[15] & 2)) {
|
|
update_time();
|
|
}
|
|
}
|
|
|
|
rtc[rtc_index] = data & 15;
|
|
rtc_index = (rtc_index + 1) & 15;
|
|
} break;
|
|
} //switch(rtc_state)
|
|
} break;
|
|
}
|
|
}
|
|
|
|
SPC7110::SPC7110() {
|
|
}
|
|
|
|
//============
|
|
//SPC7110::MCU
|
|
//============
|
|
|
|
uint8 SPC7110::mcu_read(unsigned addr) {
|
|
if(addr <= 0xdfffff) return cartridge.rom.read(dx_offset + (addr & 0x0fffff));
|
|
if(addr <= 0xefffff) return cartridge.rom.read(ex_offset + (addr & 0x0fffff));
|
|
if(addr <= 0xffffff) return cartridge.rom.read(fx_offset + (addr & 0x0fffff));
|
|
return cpu.regs.mdr;
|
|
}
|
|
|
|
void SPC7110::mcu_write(unsigned addr, uint8 data) {
|
|
}
|
|
|
|
//============
|
|
//SPC7110::DCU
|
|
//============
|
|
|
|
uint8 SPC7110::dcu_read(unsigned) {
|
|
return mmio_read(0x4800);
|
|
}
|
|
|
|
void SPC7110::dcu_write(unsigned, uint8) {
|
|
}
|
|
|
|
//============
|
|
//SPC7110::RAM
|
|
//============
|
|
|
|
uint8 SPC7110::ram_read(unsigned addr) {
|
|
return cartridge.ram.read(addr & 0x1fff);
|
|
}
|
|
|
|
void SPC7110::ram_write(unsigned addr, uint8 data) {
|
|
if(r4830 & 0x80) cartridge.ram.write(addr & 0x1fff, data);
|
|
}
|
|
|
|
}
|