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Gericom
305
src/ntrCardRomGameR4.cpp
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305
src/ntrCardRomGameR4.cpp
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#include "common.h"
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#include <stdio.h>
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#include <string.h>
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#include "sd/fatfs/ff.h"
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#include "ntrCardRom.h"
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#include "ntrCardRomGameNoScramble.h"
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#ifdef ENABLE_R4_MODE
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static FIL sRomFile;
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static FIL sSaveFile;
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static volatile bool sInitR4Rom = false;
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static volatile u32 sR4RomFatEntryAddr = 0;
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static volatile u32 sR4RomFetchAddr = 0;
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static volatile u32 sR4CurRomBlockAddr = 0;
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static volatile u32 sR4RomReadStat = 1;
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static volatile bool sInitR4Save = false;
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static volatile u32 sR4SaveFatEntryAddr = 0;
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static volatile u32 sR4SaveFetchAddr = 0xFFFFFFFF;
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static volatile u32 sR4CurSaveBlockAddr = 0xFFFFFFFF;
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static volatile bool sSaveWriteBusy = true;
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static volatile u32 sWriteSaveAddr = 0xFFFFFFFF;
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static u8 sR4RomBlock[512];
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static u8 sR4SaveBlock[512];
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static u32 sR4RomBlockLargeAddr = 0xFFFFFFFF;
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static u8 sR4RomBlockLarge[16384];//512];
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static DWORD sClusterTab[16384];
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static DWORD sSaveClusterTab[4096];
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extern FATFS sFatFs;
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extern "C" void __scratch_y("cpu0") ntrc_gameR4DummyCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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ntrc_writeWord(pio, 0);
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4GetCardInfoCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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ntrc_writeWord(pio, 0x1F4);
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4StartSaveReadCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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u32 addr = word << 8;
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u32 result = 1;
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if (addr == sR4CurSaveBlockAddr)
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{
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result = 0;
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sR4CurSaveBlockAddr = 0xFFFFFFFF;
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}
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else if (sR4SaveFetchAddr != addr)
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{
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sR4SaveFetchAddr = addr;
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}
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ntrc_writeWord(pio, result); //0=cmd0,1=cmd1,2=payload
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romEmu->wordIdx = 1;
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4GetSaveDataCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 512);
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ntrc_dmaToBus(sR4SaveBlock, 512);
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4GetSaveDataCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_finishGameNoScrambleCmd1(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4GetSaveStatCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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u32 sdStat = 1;
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if (!sSaveWriteBusy && sWriteSaveAddr == 0xFFFFFFFF)
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{
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sdStat = 0;
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}
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ntrc_writeWord(pio, sdStat);
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4SendMapCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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u64 cmd = (((u64)romEmu->cmd0) << 32) | word;
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u32 addr = (cmd >> 24) & 0xFFFFFFFF;
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u32 result = 1;
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if (!(addr & 1))
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{
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//rom
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if (sR4RomFatEntryAddr == addr)
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{
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result = sInitR4Rom;
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}
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else
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{
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sR4RomFatEntryAddr = addr;
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sInitR4Rom = true;
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}
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}
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else
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{
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//save
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addr &= ~1;
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if (sR4SaveFatEntryAddr == addr)
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{
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result = sInitR4Save;
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}
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else
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{
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sR4SaveFatEntryAddr = addr;
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sInitR4Save = true;
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}
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}
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ntrc_writeWord(pio, result);
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ntrc_finishGameNoScrambleCmd1(romEmu);
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}
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static void __no_inline_not_in_flash_func(gameR4StartRomReadCmd0Cont)(ntr_rom_emu_t* romEmu)
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{
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u32 addr = romEmu->cmd0 << 8;
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if (addr == sR4CurRomBlockAddr)
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{
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sR4CurRomBlockAddr = 0;
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}
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else if (addr != sR4CurRomBlockAddr && sR4RomFetchAddr != addr)
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{
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sR4RomFetchAddr = addr;
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}
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romEmu->wordIdx = 1;
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4StartRomReadCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 4);
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u32 addr = romEmu->cmd0 << 8;
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u32 stat = (addr == sR4CurRomBlockAddr) ? 0 : 1;
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ntrc_writeWord(pio, stat);
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gameR4StartRomReadCmd0Cont(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4StartSaveWriteCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginRead(pio, 512);
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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static void __scratch_y("cpu0") r4SaveWritePayloadComplete(ntr_rom_emu_t* romEmu)
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{
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sWriteSaveAddr = romEmu->cmd0 << 8;
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sSaveWriteBusy = true;
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameR4StartSaveWriteCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_finishGameNoScrambleCmd1WithReadPayload(romEmu, (u32*)sR4SaveBlock, 512, r4SaveWritePayloadComplete);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameNoScrambleReadPageCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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ntrc_beginWrite(pio, 512);
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#ifdef ENABLE_R4_MODE
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if (romEmu->r4Mode)
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{
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u32 address = romEmu->cmd0 << 8;
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ntrc_dmaToBus(&sR4RomBlockLarge[address & 0x3FFF], 512);
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}
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#endif
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ntrc_finishGameNoScrambleCmd0(romEmu);
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}
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extern "C" void __scratch_y("cpu0") ntrc_gameNoScrambleReadPageCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
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{
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#ifdef ENABLE_R4_MODE
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if (!romEmu->r4Mode)
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#endif
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{
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//just send some garbage
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ntrc_dmaToBus(sR4RomBlockLarge, 512);
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}
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ntrc_finishGameNoScrambleCmd1(romEmu);
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}
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static void initFileFromFatEntry(FIL* file, u32 fatEntryAddr, bool save)
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{
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while (!gSdCard.TryReadSectorsSync(sR4RomBlock, fatEntryAddr >> 9, 1));
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const u8* fatEntry = &sR4RomBlock[fatEntryAddr & 0x1FF];
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u32 firstCluster = *(const u16*)&fatEntry[26];
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firstCluster |= *(const u16*)&fatEntry[20] << 16;
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file->obj.fs = &sFatFs;
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file->obj.id = sFatFs.id;
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file->obj.sclust = firstCluster;
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file->obj.attr = 0;
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file->obj.objsize = *(const u32*)&fatEntry[28];
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file->dir_sect = fatEntryAddr >> 9;
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file->dir_ptr = &sFatFs.win[fatEntryAddr & 0x1FF];
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file->cltbl = 0;
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file->flag = save ? (FA_READ | FA_WRITE) : FA_READ;
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file->err = 0;
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file->sect = 0;
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file->fptr = 0;
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}
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extern "C" void __time_critical_func(ntrc_gameR4Update)(void)
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{
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if (sInitR4Rom)
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{
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initFileFromFatEntry(&sRomFile, sR4RomFatEntryAddr, false);
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gNtrRomEmu.romSize = f_size(&sRomFile);
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sRomFile.cltbl = sClusterTab;
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sClusterTab[0] = 16384;
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while (f_lseek(&sRomFile, CREATE_LINKMAP) != FR_OK);
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gNtrRomEmu.r4Mode = true;
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sInitR4Rom = false;
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}
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if (sInitR4Save)
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{
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initFileFromFatEntry(&sSaveFile, sR4SaveFatEntryAddr, true);
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sSaveFile.cltbl = sSaveClusterTab;
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sSaveClusterTab[0] = 4096;
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while (f_lseek(&sSaveFile, CREATE_LINKMAP) != FR_OK);
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sInitR4Save = false;
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}
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if (sR4RomFetchAddr)
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{
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if ((sR4RomFetchAddr & ~0x3FFF) != sR4RomBlockLargeAddr)
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{
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while (f_lseek(&sRomFile, sR4RomFetchAddr & ~0x3FFF) != FR_OK);
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UINT br;
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while (f_read(&sRomFile, sR4RomBlockLarge, sizeof(sR4RomBlockLarge), &br) != FR_OK);
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sR4RomBlockLargeAddr = sR4RomFetchAddr & ~0x3FFF;
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}
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sR4CurRomBlockAddr = sR4RomFetchAddr;
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sR4RomFetchAddr = 0;
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}
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if (sR4SaveFetchAddr != 0xFFFFFFFF)
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{
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while (f_lseek(&sSaveFile, sR4SaveFetchAddr) != FR_OK);
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UINT br;
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while (f_read(&sSaveFile, sR4SaveBlock, 512, &br) != FR_OK);
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sR4CurSaveBlockAddr = sR4SaveFetchAddr;
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sR4SaveFetchAddr = 0xFFFFFFFF;
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}
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if (sSaveWriteBusy && sWriteSaveAddr != 0xFFFFFFFF)
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{
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while (f_lseek(&sSaveFile, sWriteSaveAddr) != FR_OK);
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UINT br;
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while (f_write(&sSaveFile, sR4SaveBlock, 512, &br) != FR_OK);
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while (f_sync(&sSaveFile) != FR_OK);
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sWriteSaveAddr = 0xFFFFFFFF;
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sSaveWriteBusy = false;
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}
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}
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extern "C" void ntrc_resetR4(void)
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{
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gNtrRomEmu.r4Mode = false;
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sInitR4Rom = false;
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sR4RomFatEntryAddr = 0;
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sR4RomFetchAddr = 0;
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sR4CurRomBlockAddr = 0;
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sR4RomReadStat = 1;
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sInitR4Save = false;
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sR4SaveFatEntryAddr = 0;
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sR4SaveFetchAddr = 0xFFFFFFFF;
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sR4CurSaveBlockAddr = 0xFFFFFFFF;
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sSaveWriteBusy = true;
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sWriteSaveAddr = 0xFFFFFFFF;
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sR4RomBlockLargeAddr = 0xFFFFFFFF;
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}
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#endif
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