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Implement FastCpuSet

This commit is contained in:
Jeffrey Pfau 2013-04-16 23:52:53 -07:00
parent c143dec77d
commit 45fcd0fcb5
1 changed files with 23 additions and 0 deletions
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23
src/gba/gba-bios.c
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@ -46,6 +46,26 @@ static void _CpuSet(struct GBA* gba) {
}
}
static void _FastCpuSet(struct GBA* gba) {
uint32_t source = gba->cpu.gprs[0] & 0xFFFFFFFC;
uint32_t dest = gba->cpu.gprs[1] & 0xFFFFFFFC;
uint32_t mode = gba->cpu.gprs[2];
int count = mode & 0x000FFFFF;
count = ((count + 7) >> 3) << 3;
int i;
if (mode & 0x01000000) {
int32_t word = GBALoad32(&gba->memory.d, source);
for (i = 0; i < count; ++i) {
GBAStore32(&gba->memory.d, dest + (i << 2), word);
}
} else {
for (i = 0; i < count; ++i) {
int32_t word = GBALoad32(&gba->memory.d, source + (i << 2));
GBAStore32(&gba->memory.d, dest + (i << 2), word);
}
}
}
void GBASwi16(struct ARMBoard* board, int immediate) {
struct GBA* gba = ((struct GBABoard*) board)->p;
switch (immediate) {
@ -55,6 +75,9 @@ void GBASwi16(struct ARMBoard* board, int immediate) {
case 0xB:
_CpuSet(gba);
break;
case 0xC:
_FastCpuSet(gba);
break;
default:
GBALog(GBA_LOG_STUB, "Stub software interrupt: %02x", immediate);
}