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#include <dolphin/dolphin.h>
#include <dolphin/os.h>
#include "__os.h"
struct Timer {
OSTimerCallback callback;
u32 currval;
u32 startval;
u32 mode;
BOOL stopped;
BOOL initialized;
};
static struct Timer Timer;
// prototypes
static void DecrementerExceptionHandler(__OSException exception, OSContext* context);
OSTimerCallback OSSetTimerCallback(OSTimerCallback callback) {
OSTimerCallback prevCallback;
#if DEBUG
if(!Timer.initialized) {
OSPanic(__FILE__, 135, "OSSetTimerCallback(): timer is not initialized.");
}
#endif
Timer.stopped = TRUE;
prevCallback = Timer.callback;
Timer.callback = callback;
return prevCallback;
}
void OSInitTimer(u32 time, u32 mode) {
#if DEBUG
if (time >= 0x80000000) {
OSPanic(__FILE__, 159, "OSInitTimer(): time param must be less than 0x80000000.");
}
#endif
Timer.stopped = TRUE;
Timer.currval = time;
Timer.startval = time;
Timer.mode = mode;
if (!Timer.initialized) {
__OSSetExceptionHandler(8, &DecrementerExceptionHandler);
Timer.initialized = TRUE;
Timer.callback = 0;
#if DEBUG
OSReport("Timer initialized\n");
#endif
}
}
void OSStartTimer(void) {
BOOL enabled;
#if DEBUG
if (!Timer.initialized) {
OSPanic(__FILE__, 192, "OSStartTimer(): timer is not initialized.");
}
#endif
enabled = OSDisableInterrupts();
PPCMtdec(Timer.currval);
Timer.stopped = FALSE;
OSRestoreInterrupts(enabled);
}
void OSStopTimer(void) {
BOOL enabled;
#if DEBUG
if (!Timer.initialized) {
OSPanic(__FILE__, 216, "OSStopTimer(): timer is not initialized.");
}
#endif
enabled = OSDisableInterrupts();
if (!Timer.stopped) {
Timer.stopped = TRUE;
Timer.currval = PPCMfdec();
if (Timer.currval & 0x80000000) {
Timer.currval = 0;
}
}
OSRestoreInterrupts(enabled);
}
static void DecrementerExceptionCallback(__OSException exception, OSContext* context) {
OSContext exceptionContext;
OSClearContext(&exceptionContext);
OSSetCurrentContext(&exceptionContext);
if (!Timer.stopped) {
if (Timer.mode == 1) {
PPCMtdec(Timer.startval);
}
if (Timer.mode == 2) {
Timer.stopped = TRUE;
}
if (Timer.callback) {
Timer.callback();
}
}
OSClearContext(&exceptionContext);
OSSetCurrentContext(context);
OSLoadContext(context);
}
#ifdef __GEKKO__
static asm void DecrementerExceptionHandler(__OSException exception,
__REGISTER OSContext* context) {
nofralloc
stw r0, context->gpr[0]
stw r1, context->gpr[1]
stw r2, context->gpr[2]
stmw r6, context->gpr[6]
mfspr r0, GQR1
stw r0, context->gqr[1]
mfspr r0, GQR2
stw r0, context->gqr[2]
mfspr r0, GQR3
stw r0, context->gqr[3]
mfspr r0, GQR4
stw r0, context->gqr[4]
mfspr r0, GQR5
stw r0, context->gqr[5]
mfspr r0, GQR6
stw r0, context->gqr[6]
mfspr r0, GQR7
stw r0, context->gqr[7]
stwu r1, -0x8(r1)
b DecrementerExceptionCallback
}
#endif
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