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Revert DMA:Linger last DMA on bus ... 

Pulled in from merge of libretro fork, causes a regression in Croket 2.

This reverts commit a9f35645b7.
This commit is contained in:
Rafael Kitover 2021-10-23 22:34:35 +00:00
parent c37c472996
commit 173512f65a
No known key found for this signature in database
GPG Key ID: 08AB596679D86240
2 changed files with 8 additions and 11 deletions
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10
src/gba/GBA.cpp
View File

@ -50,9 +50,8 @@ bool busPrefetchEnable = false;
uint32_t busPrefetchCount = 0;
int cpuDmaTicksToUpdate = 0;
int cpuDmaCount = 0;
bool cpuDmaRunning = false;
bool cpuDmaHack = false;
uint32_t cpuDmaLast = 0;
uint32_t cpuDmaPC = 0;
int dummyAddress = 0;
bool cpuBreakLoop = false;
@ -2344,8 +2343,7 @@ void doDMA(uint32_t& s, uint32_t& d, uint32_t si, uint32_t di, uint32_t c, int t
int dw = 0;
int sc = c;
cpuDmaRunning = true;
cpuDmaPC = reg[15].I;
cpuDmaHack = true;
cpuDmaCount = c;
// This is done to get the correct waitstates.
if (sm > 15)
@ -2410,7 +2408,7 @@ void doDMA(uint32_t& s, uint32_t& d, uint32_t si, uint32_t di, uint32_t c, int t
}
cpuDmaTicksToUpdate += totalTicks;
cpuDmaRunning = false;
cpuDmaHack = false;
}
void CPUCheckDMA(int reason, int dmamask)
@ -3662,7 +3660,7 @@ void CPUReset()
systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;
cpuDmaRunning = false;
cpuDmaHack = false;
lastTime = systemGetClock();

9
src/gba/GBAinline.h
View File

@ -20,9 +20,8 @@ extern bool cpuSramEnabled;
extern bool cpuFlashEnabled;
extern bool cpuEEPROMEnabled;
extern bool cpuEEPROMSensorEnabled;
extern bool cpuDmaRunning;
extern bool cpuDmaHack;
extern uint32_t cpuDmaLast;
extern uint32_t cpuDmaPC;
extern bool timer0On;
extern int timer0Ticks;
extern int timer0ClockReload;
@ -141,7 +140,7 @@ static inline uint32_t CPUReadMemory(uint32_t address)
armMode ? armNextPC - 4 : armNextPC - 2);
}
#endif
if (cpuDmaRunning || ((reg[15].I - cpuDmaPC) == (armState ? 4 : 2))) {
if (cpuDmaHack) {
value = cpuDmaLast;
} else {
if (armState) {
@ -285,7 +284,7 @@ static inline uint32_t CPUReadHalfWord(uint32_t address)
// default
default:
unreadable:
if (cpuDmaRunning|| ((reg[15].I - cpuDmaPC) == (armState ? 4 : 2))) {
if (cpuDmaHack) {
value = cpuDmaLast & 0xFFFF;
} else {
int param = reg[15].I;
@ -418,7 +417,7 @@ static inline uint8_t CPUReadByte(uint32_t address)
armMode ? armNextPC - 4 : armNextPC - 2);
}
#endif
if (cpuDmaRunning || ((reg[15].I - cpuDmaPC) == (armState ? 4 : 2))) {
if (cpuDmaHack) {
return cpuDmaLast & 0xFF;
} else {
if (armState) {