1 files changed, 151 insertions, 0 deletions
diff --git a/arm9/asm/OS_tick.s b/arm9/asm/OS_tick.s
new file mode 100644
index 00000000..f43c45a1
--- /dev/null
+++ b/arm9/asm/OS_tick.s
@@ -0,0 +1,151 @@
+    .include "asm/macros.inc"
+    .include "global.inc"
+
+    .text
+
+	arm_func_start OS_GetTickLo
+OS_GetTickLo: ; 0x020CCC0C
+	ldr r0, _020CCC18 ; =0x04000100
+	ldrh r0, [r0, #0x0]
+	bx lr
+	.balign 4
+_020CCC18: .word 0x04000100
+
+	arm_func_start OS_GetTick
+OS_GetTick: ; 0x020CCC1C
+	stmdb sp!, {lr}
+	sub sp, sp, #0xc
+	bl OS_DisableInterrupts
+	ldr r1, _020CCCBC ; =0x04000100
+	ldr r3, _020CCCC0 ; =OSi_TickCounter
+	ldrh r12, [r1, #0x0]
+	ldr r2, _020CCCC4 ; =0x0000FFFF
+	mvn r1, #0x0
+	strh r12, [sp, #0x0]
+	ldr r12, [r3, #0x0]
+	ldr r3, [r3, #0x4]
+	and r1, r12, r1
+	and r2, r3, r2
+	str r1, [sp, #0x4]
+	ldr r1, _020CCCC8 ; =0x04000214
+	str r2, [sp, #0x8]
+	ldr r1, [r1, #0x0]
+	ands r1, r1, #0x8
+	beq _020CCC90
+	ldrh r1, [sp, #0x0]
+	ands r1, r1, #0x8000
+	bne _020CCC90
+	ldr r3, [sp, #0x4]
+	mov r1, #0x1
+	ldr r2, [sp, #0x8]
+	adds r3, r3, r1
+	adc r1, r2, #0x0
+	str r3, [sp, #0x4]
+	str r1, [sp, #0x8]
+_020CCC90:
+	bl OS_RestoreInterrupts
+	ldr r2, [sp, #0x4]
+	ldr r1, [sp, #0x8]
+	ldrh r0, [sp, #0x0]
+	mov r1, r1, lsl #0x10
+	orr r1, r1, r2, lsr #0x10
+	orr r1, r1, r0, asr #0x1f
+	orr r0, r0, r2, lsl #0x10
+	add sp, sp, #0xc
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020CCCBC: .word 0x04000100
+_020CCCC0: .word OSi_TickCounter
+_020CCCC4: .word 0x0000FFFF
+_020CCCC8: .word 0x04000214
+
+	arm_func_start OSi_CountUpTick
+OSi_CountUpTick: ; 0x020CCCCC
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	ldr r2, _020CCD40 ; =OSi_TickCounter
+	ldr r1, _020CCD44 ; =OSi_NeedResetTimer
+	ldr r12, [r2, #0x0]
+	mov r0, #0x1
+	ldr r3, [r2, #0x4]
+	adds r12, r12, r0
+	ldr r0, [r1, #0x0]
+	adc r3, r3, #0x0
+	str r12, [r2, #0x0]
+	str r3, [r2, #0x4]
+	cmp r0, #0x0
+	mov r3, #0x0
+	beq _020CCD24
+	ldr r2, _020CCD48 ; =0x04000102
+	ldr r0, _020CCD4C ; =0x04000100
+	strh r3, [r2, #0x0]
+	strh r3, [r0, #0x0]
+	mov r0, #0xc1
+	strh r0, [r2, #0x0]
+	str r3, [r1, #0x0]
+_020CCD24:
+	mov r0, #0x0
+	ldr r1, _020CCD50 ; =OSi_CountUpTick
+	mov r2, r0
+	bl OSi_EnterTimerCallback
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020CCD40: .word OSi_TickCounter
+_020CCD44: .word OSi_NeedResetTimer
+_020CCD48: .word 0x04000102
+_020CCD4C: .word 0x04000100
+_020CCD50: .word OSi_CountUpTick
+
+	arm_func_start OS_IsTickAvailable
+OS_IsTickAvailable: ; 0x020CCD54
+	ldr r0, _020CCD60 ; =OSi_UseTick
+	ldrh r0, [r0, #0x0]
+	bx lr
+	.balign 4
+_020CCD60: .word OSi_UseTick
+
+	arm_func_start OS_InitTick
+OS_InitTick: ; 0x020CCD64
+	stmdb sp!, {lr}
+	sub sp, sp, #0x4
+	ldr r1, _020CCDE8 ; =OSi_UseTick
+	ldrh r0, [r1, #0x0]
+	cmp r0, #0x0
+	addne sp, sp, #0x4
+	ldmneia sp!, {lr}
+	bxne lr
+	mov r2, #0x1
+	mov r0, #0x0
+	strh r2, [r1, #0x0]
+	bl OSi_SetTimerReserved
+	ldr r0, _020CCDEC ; =OSi_TickCounter
+	mov r2, #0x0
+	str r2, [r0, #0x0]
+	ldr r3, _020CCDF0 ; =0x04000102
+	str r2, [r0, #0x4]
+	ldr r0, _020CCDF4 ; =0x04000100
+	strh r2, [r3, #0x0]
+	ldr r1, _020CCDF8 ; =OSi_CountUpTick
+	strh r2, [r0, #0x0]
+	mov r2, #0xc1
+	mov r0, #0x8
+	strh r2, [r3, #0x0]
+	bl OS_SetIrqFunction
+	mov r0, #0x8
+	bl OS_EnableIrqMask
+	ldr r0, _020CCDFC ; =OSi_NeedResetTimer
+	mov r1, #0x0
+	str r1, [r0, #0x0]
+	add sp, sp, #0x4
+	ldmia sp!, {lr}
+	bx lr
+	.balign 4
+_020CCDE8: .word OSi_UseTick
+_020CCDEC: .word OSi_TickCounter
+_020CCDF0: .word 0x04000102
+_020CCDF4: .word 0x04000100
+_020CCDF8: .word OSi_CountUpTick
+_020CCDFC: .word OSi_NeedResetTimer