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GB MBC: Ensure SRAM size is properly updated if GBMBCInit is called again

This commit is contained in:
Vicki Pfau 2025-03-15 01:32:37 -07:00
parent 84704502bd
commit 50a314913f
2 changed files with 19 additions and 17 deletions
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1
src/gb/gb.c
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@ -87,6 +87,7 @@ static void GBInit(void* cpu, struct mCPUComponent* component) {
gb->isPristine = false;
gb->pristineRomSize = 0;
gb->yankedRomSize = 0;
gb->sramSize = 0;
memset(&gb->gbx, 0, sizeof(gb->gbx));

35
src/gb/mbc.c
View File

@ -274,6 +274,7 @@ void GBMBCSwitchSramHalfBank(struct GB* gb, int half, int bank) {
void GBMBCInit(struct GB* gb) {
const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
size_t sramSize = 0;
if (gb->memory.rom && gb->memory.romSize) {
if (gb->memory.romSize >= 0x8000) {
const struct GBCartridge* cartFooter = (const struct GBCartridge*) &gb->memory.rom[gb->memory.romSize - 0x7F00];
@ -282,25 +283,25 @@ void GBMBCInit(struct GB* gb) {
}
}
if (gb->gbx.romSize) {
gb->sramSize = gb->gbx.ramSize;
sramSize = gb->gbx.ramSize;
gb->memory.mbcType = gb->gbx.mbc;
} else {
switch (cart->ramSize) {
case 0:
gb->sramSize = 0;
sramSize = 0;
break;
default:
case 2:
gb->sramSize = 0x2000;
sramSize = 0x2000;
break;
case 3:
gb->sramSize = 0x8000;
sramSize = 0x8000;
break;
case 4:
gb->sramSize = 0x20000;
sramSize = 0x20000;
break;
case 5:
gb->sramSize = 0x10000;
sramSize = 0x10000;
break;
}
}
@ -399,7 +400,7 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcWrite = _GBMBC2;
gb->memory.mbcRead = _GBMBC2Read;
gb->memory.directSramAccess = false;
gb->sramSize = 0x100;
sramSize = 0x100;
break;
case GB_MBC3:
gb->memory.mbcWrite = _GBMBC3;
@ -414,15 +415,15 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcWrite = _GBMBC6;
gb->memory.mbcRead = _GBMBC6Read;
gb->memory.directSramAccess = false;
if (!gb->sramSize) {
gb->sramSize = GB_SIZE_EXTERNAL_RAM; // Force minimum size for convenience
if (!sramSize) {
sramSize = GB_SIZE_EXTERNAL_RAM; // Force minimum size for convenience
}
gb->sramSize += GB_SIZE_MBC6_FLASH; // Flash is concatenated at the end
sramSize += GB_SIZE_MBC6_FLASH; // Flash is concatenated at the end
break;
case GB_MBC7:
gb->memory.mbcWrite = _GBMBC7;
gb->memory.mbcRead = _GBMBC7Read;
gb->sramSize = 0x100;
sramSize = 0x100;
break;
case GB_MMM01:
gb->memory.mbcWrite = _GBMMM01;
@ -440,7 +441,7 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcState.tama5.rtcAlarmPage[GBTAMA6_RTC_PAGE] = 1;
gb->memory.mbcState.tama5.rtcFreePage0[GBTAMA6_RTC_PAGE] = 2;
gb->memory.mbcState.tama5.rtcFreePage1[GBTAMA6_RTC_PAGE] = 3;
gb->sramSize = 0x20;
sramSize = 0x20;
break;
case GB_MBC3_RTC:
memset(gb->memory.rtcRegs, 0, sizeof(gb->memory.rtcRegs));
@ -452,8 +453,8 @@ void GBMBCInit(struct GB* gb) {
case GB_POCKETCAM:
gb->memory.mbcWrite = _GBPocketCam;
gb->memory.mbcRead = _GBPocketCamRead;
if (!gb->sramSize) {
gb->sramSize = GB_SIZE_EXTERNAL_RAM; // Force minimum size for convenience
if (!sramSize) {
sramSize = GB_SIZE_EXTERNAL_RAM; // Force minimum size for convenience
}
if (gb->memory.cam && gb->memory.cam->startRequestImage) {
gb->memory.cam->startRequestImage(gb->memory.cam, GBCAM_WIDTH, GBCAM_HEIGHT, mCOLOR_ANY);
@ -508,7 +509,7 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcReadBank1 = true;
gb->memory.mbcReadHigh = true;
gb->memory.mbcWriteHigh = true;
if (gb->sramSize) {
if (sramSize) {
gb->memory.sramAccess = true;
}
break;
@ -516,7 +517,7 @@ void GBMBCInit(struct GB* gb) {
gb->memory.mbcWrite = _GBSintax;
gb->memory.mbcRead = _GBSintaxRead;
gb->memory.mbcReadBank1 = true;
if (gb->sramSize) {
if (sramSize) {
gb->memory.sramAccess = true;
}
break;
@ -539,7 +540,7 @@ void GBMBCInit(struct GB* gb) {
}
memset(&gb->memory.rtcRegs, 0, sizeof(gb->memory.rtcRegs));
GBResizeSram(gb, gb->sramSize);
GBResizeSram(gb, sramSize);
if (gb->memory.mbcType == GB_MBC3_RTC) {
GBMBCRTCRead(gb);