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mgba
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Copy some IRQ infrastructure from GBA.js

This commit is contained in:
Jeffrey Pfau 2013-04-16 19:41:09 -07:00
parent bc9d0690bb
commit 20622b6135
2 changed files with 53 additions and 0 deletions
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48
src/gba/gba.c
View File

@ -37,6 +37,8 @@ void GBAInit(struct GBA* gba) {
gba->video.p = gba;
GBAVideoInit(&gba->video);
gba->springIRQ = 0;
ARMReset(&gba->cpu);
}
@ -127,6 +129,52 @@ void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq) {
}
}
void GBAPollNextEvent(struct GBA* gba) {
int32_t nextEvent = gba->video.nextEvent;
gba->cpu.nextEvent = nextEvent;
}
int GBATestIRQ(struct GBA* gba) {
if (gba->memory.io[REG_IME >> 1] && gba->memory.io[REG_IE >> 1] & gba->memory.io[REG_IF >> 1]) {
gba->springIRQ = 1;
gba->cpu.nextEvent = gba->cpu.cycles;
return 1;
}
return 0;
}
int GBAWaitForIRQ(struct GBA* gba) {
int irqPending = GBATestIRQ(gba) || gba->video.hblankIRQ || gba->video.vblankIRQ || gba->video.vcounterIRQ;
/*if (this.timersEnabled) {
timer = this.timers[0];
irqPending = irqPending || timer.doIrq;
timer = this.timers[1];
irqPending = irqPending || timer.doIrq;
timer = this.timers[2];
irqPending = irqPending || timer.doIrq;
timer = this.timers[3];
irqPending = irqPending || timer.doIrq;
}*/
if (!irqPending) {
return 0;
}
while (1) {
GBAPollNextEvent(gba);
if (gba->cpu.nextEvent == INT_MAX) {
return 0;
} else {
gba->cpu.cycles = gba->cpu.nextEvent;
GBAProcessEvents(&gba->board.d);
if (gba->memory.io[REG_IF >> 1]) {
return 1;
}
}
}
}
void GBALog(int level, const char* format, ...) {
va_list args;
va_start(args, format);

5
src/gba/gba.h
View File

@ -45,6 +45,8 @@ struct GBA {
struct ARMDebugger* debugger;
int springIRQ;
enum GBAError errno;
const char* errstr;
};
@ -61,6 +63,9 @@ void GBABoardReset(struct ARMBoard* board);
void GBAWriteIE(struct GBA* gba, uint16_t value);
void GBAWriteIME(struct GBA* gba, uint16_t value);
void GBARaiseIRQ(struct GBA* gba, enum GBAIRQ irq);
void GBAPollNextEvent(struct GBA* gba);
int GBATestIRQ(struct GBA* gba);
int GBAWaitForIRQ(struct GBA* gba);
void GBAAttachDebugger(struct GBA* gba, struct ARMDebugger* debugger);