arm9 OS_tick

1 files changed, 70 insertions, 0 deletions

diff --git a/arm9/lib/src/OS_tick.c b/arm9/lib/src/OS_tick.c
new file mode 100644
index 00000000..f5f2df30
--- /dev/null
+++ b/arm9/lib/src/OS_tick.c
@@ -0,0 +1,70 @@
+#include "function_target.h"
+#include "OS_tick.h"
+#include "OS_interrupt.h"
+#include "OS_timer.h"
+#include "OS_system.h"
+
+static u16 OSi_UseTick = FALSE;
+vu64 OSi_TickCounter;
+BOOL OSi_NeedResetTimer = FALSE;
+
+extern void OSi_SetTimerReserved(u32 param1);
+
+ARM_FUNC void OS_InitTick(void)
+{
+    if (OSi_UseTick)
+    {
+        return;
+    }
+    OSi_UseTick = 1;
+    OSi_SetTimerReserved(0);
+    OSi_TickCounter = 0;
+    reg_OS_TM0CNT_H = 0;
+    reg_OS_TM0CNT_L = 0;
+    reg_OS_TM0CNT_H = 0xc1;
+    OS_SetIrqFunction(8, OSi_CountUpTick);
+    (void)OS_EnableIrqMask(8);
+    OSi_NeedResetTimer = FALSE;
+}
+
+ARM_FUNC BOOL OS_IsTickAvailable(void)
+{
+    return OSi_UseTick;
+}
+
+ARM_FUNC static void OSi_CountUpTick(void)
+{
+    OSi_TickCounter++;
+
+    if (OSi_NeedResetTimer)
+    {
+        OS_SetTimerControl(OS_TIMER_0, 0);
+        OS_SetTimerCount(OS_TIMER_0, 0);
+        OS_SetTimerControl(OS_TIMER_0, OSi_TICK_TIMERCONTROL);
+
+        OSi_NeedResetTimer = FALSE;
+    }
+
+    OSi_EnterTimerCallback(OS_TIMER_0, (void (*)(void *))OSi_CountUpTick, 0);
+}
+
+ARM_FUNC OSTick OS_GetTick(void)
+{
+    OSIntrMode prev = OS_DisableInterrupts();
+    vu16 countL = *(REGType16 *)((u32)&reg_OS_TM0CNT_L + OS_TIMER_0 * 4);
+    vu64 countH = OSi_TickCounter & 0xffffffffffffULL;
+
+    if (reg_OS_IF & OS_IE_TIMER0 && !(countL & 0x8000))
+    {
+        countH++;
+    }
+
+    (void)OS_RestoreInterrupts(prev);
+
+    return (countH << 16) | countL;
+}
+
+ARM_FUNC u16 OS_GetTickLo(void)
+{
+    return reg_OS_TM0CNT_L;
+}