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Add proper support for SuperFX 8MB ROM emulation

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This code adds support for SuperFX ROMS which use the extended 6MB CPU ROM region specified by the official SNES documentation. It's not super well-tested though.
This commit is contained in:
Yoshimaster96 2021-07-31 17:33:31 -05:00 committed by GitHub
parent 9398d21e01
commit 8980c6fc32
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 51 additions and 13 deletions
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2
fxemu.cpp
View File

@ -196,7 +196,7 @@ static void FxReset (struct FxInfo_s *psFxInfo)
else
{
b %= GSU.nRomBanks * 2;
GSU.apvRomBank[i] = &GSU.pvRom[(b << 16) + 0x200000];
GSU.apvRomBank[i] = &GSU.pvRom[(b << 16) + 0x800000];
}
}

60
memmap.cpp
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@ -1449,6 +1449,10 @@ bool8 CMemory::LoadROMInt (int32 ROMfillSize)
CalculatedSize = ((ROMfillSize + 0x1fff) / 0x2000) * 0x2000;
if (CalculatedSize > 0x400000 &&
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1320 && // exclude SuperFX
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1420 &&
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1520 &&
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x1A20 &&
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x3423 && // exclude SA-1
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x3523 &&
(ROM[0x7fd5] + (ROM[0x7fd6] << 8)) != 0x4332 && // exclude S-DD1
@ -3066,24 +3070,58 @@ void CMemory::Map_SuperFXLoROMMap (void)
printf("Map_SuperFXLoROMMap\n");
map_System();
// Replicate the first 2Mb of the ROM at ROM + 2MB such that each 32K
// Replicate the first 2Mb of the ROM at ROM + 8MB such that each 32K
// block is repeated twice in each 64K block.
for (int c = 0; c < 64; c++)
{
memmove(&ROM[0x200000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
memmove(&ROM[0x208000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
memmove(&ROM[0x800000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
memmove(&ROM[0x808000 + c * 0x10000], &ROM[c * 0x8000], 0x8000);
}
map_lorom(0x00, 0x3f, 0x8000, 0xffff, CalculatedSize);
map_lorom(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize);
// Check GSU revision (not 100% accurate but it works)
// GSU2
if (CalculatedSize > 0x400000)
{
map_lorom(0x00, 0x3f, 0x8000, 0xffff, 0x200000);
map_lorom_offset(0x80, 0xbf, 0x8000, 0xffff, 0x200000, 0x200000);
map_hirom_offset(0x40, 0x7f, 0x0000, 0xffff, CalculatedSize, 0);
map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize, 0);
map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, 0x200000, 0);
map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize - 0x400000, 0x400000);
map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
}
else if (CalculatedSize > 0x200000)
{
map_lorom(0x00, 0x3f, 0x8000, 0xffff, 0x200000);
map_lorom_offset(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize - 0x200000, 0x200000);
map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, 0x200000, 0);
map_hirom_offset(0xc0, 0xff, 0x0000, 0xffff, CalculatedSize - 0x200000, 0x200000);
map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
}
// GSU1
else
{
map_lorom(0x00, 0x3f, 0x8000, 0xffff, CalculatedSize);
map_lorom(0x80, 0xbf, 0x8000, 0xffff, CalculatedSize);
map_hirom_offset(0x40, 0x5f, 0x0000, 0xffff, CalculatedSize, 0);
map_hirom_offset(0xc0, 0xdf, 0x0000, 0xffff, CalculatedSize, 0);
map_space(0x00, 0x3f, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x80, 0xbf, 0x6000, 0x7fff, SRAM - 0x6000);
map_space(0x70, 0x70, 0x0000, 0xffff, SRAM);
map_space(0x71, 0x71, 0x0000, 0xffff, SRAM + 0x10000);
map_space(0xf0, 0xf0, 0x0000, 0xffff, SRAM);
map_space(0xf1, 0xf1, 0x0000, 0xffff, SRAM + 0x10000);
}
map_WRAM();

2
memmap.h
View File

@ -15,7 +15,7 @@
struct CMemory
{
enum
{ MAX_ROM_SIZE = 0x800000 };
{ MAX_ROM_SIZE = 0xC00000 };
enum file_formats
{ FILE_ZIP, FILE_JMA, FILE_DEFAULT };