1 files changed, 128 insertions, 0 deletions
diff --git a/arm9/asm/OS_vramExclusive.s b/arm9/asm/OS_vramExclusive.s
new file mode 100644
index 00000000..7b780f69
--- /dev/null
+++ b/arm9/asm/OS_vramExclusive.s
@@ -0,0 +1,128 @@
+    .include "asm/macros.inc"
+    .include "global.inc"
+
+    .text
+
+	arm_func_start OsCountZeroBits
+OsCountZeroBits: ; 0x020CD5BC
+	clz r0, r0
+	bx lr
+
+	arm_func_start OSi_UnlockVram
+OSi_UnlockVram: ; 0x020CD5C4
+	stmdb sp!, {r4-r10,lr}
+	mov r5, r0
+	mov r10, r1
+	bl OS_DisableInterrupts
+	ldr r4, _020CD640 ; =OSi_vramExclusive
+	ldr r1, _020CD644 ; =0x000001FF
+	ldr r2, [r4, #0x0]
+	mov r8, r0
+	and r0, r5, r2
+	and r9, r0, r1
+	ldr r6, _020CD648 ; =OSi_vramLockId
+	mov r7, #0x1
+	mov r5, #0x0
+_020CD5F8:
+	mov r0, r9
+	bl OsCountZeroBits
+	rsbs r2, r0, #0x1f
+	bmi _020CD630
+	mov r1, r2, lsl #0x1
+	ldrh r0, [r6, r1]
+	mvn r2, r7, lsl r2
+	cmp r10, r0
+	ldreq r0, [r4, #0x0]
+	and r9, r9, r2
+	andeq r0, r0, r2
+	streqh r5, [r6, r1]
+	streq r0, [r4, #0x0]
+	b _020CD5F8
+_020CD630:
+	mov r0, r8
+	bl OS_RestoreInterrupts
+	ldmia sp!, {r4-r10,lr}
+	bx lr
+	.balign 4
+_020CD640: .word OSi_vramExclusive
+_020CD644: .word 0x000001FF
+_020CD648: .word OSi_vramLockId
+
+	arm_func_start OSi_TryLockVram
+OSi_TryLockVram: ; 0x020CD64C
+	stmdb sp!, {r4-r9,lr}
+	sub sp, sp, #0x4
+	mov r6, r0
+	mov r8, r1
+	bl OS_DisableInterrupts
+	ldr r1, _020CD714 ; =OSi_vramExclusive
+	mov r7, r0
+	ldr r0, [r1, #0x0]
+	and r5, r6, r0
+	ldr sb, _020CD718 ; =OSi_vramLockId
+	mov r4, #0x1
+_020CD678:
+	mov r0, r5
+	bl OsCountZeroBits
+	rsbs r1, r0, #0x1f
+	bmi _020CD6B8
+	mov r0, r1, lsl #0x1
+	ldrh r0, [r9, r0]
+	mvn r1, r4, lsl r1
+	cmp r8, r0
+	and r5, r5, r1
+	beq _020CD678
+	mov r0, r7
+	bl OS_RestoreInterrupts
+	add sp, sp, #0x4
+	mov r0, #0x0
+	ldmia sp!, {r4-r9,lr}
+	bx lr
+_020CD6B8:
+	ldr r0, _020CD71C ; =0x000001FF
+	and r6, r6, r0
+	ldr r4, _020CD718 ; =OSi_vramLockId
+	ldr sb, _020CD714 ; =OSi_vramExclusive
+	mov r5, #0x1
+_020CD6CC:
+	mov r0, r6
+	bl OsCountZeroBits
+	rsbs r1, r0, #0x1f
+	bmi _020CD6FC
+	ldr r0, [r9, #0x0]
+	mvn r2, r5, lsl r1
+	orr r0, r0, r5, lsl r1
+	mov r1, r1, lsl #0x1
+	strh r8, [r4, r1]
+	str r0, [r9, #0x0]
+	and r6, r6, r2
+	b _020CD6CC
+_020CD6FC:
+	mov r0, r7
+	bl OS_RestoreInterrupts
+	mov r0, #0x1
+	add sp, sp, #0x4
+	ldmia sp!, {r4-r9,lr}
+	bx lr
+	.balign 4
+_020CD714: .word OSi_vramExclusive
+_020CD718: .word OSi_vramLockId
+_020CD71C: .word 0x000001FF
+
+	arm_func_start OSi_InitVramExclusive
+OSi_InitVramExclusive: ; 0x020CD720
+	ldr r0, _020CD74C ; =OSi_vramExclusive
+	mov r3, #0x0
+	str r3, [r0, #0x0]
+	ldr r0, _020CD750 ; =OSi_vramLockId
+	mov r2, r3
+_020CD734:
+	mov r1, r3, lsl #0x1
+	add r3, r3, #0x1
+	strh r2, [r0, r1]
+	cmp r3, #0x9
+	blt _020CD734
+	bx lr
+	.balign 4
+_020CD74C: .word OSi_vramExclusive
+_020CD750: .word OSi_vramLockId