Begin disassembling bg.s

3 files changed, 552 insertions, 1081 deletions

diff --git a/asm/bg.s b/asm/bg.s
index 4526f8116..f48341dd6 100644
--- a/asm/bg.s
+++ b/asm/bg.s
@@ -5,1069 +5,6 @@
 
 	.text
 
-	thumb_func_start ResetBgs
-@ void ResetBgs()
-ResetBgs: @ 80012F0
-	push {lr}
-	bl ResetBgControlStructs
-	ldr r1, =gUnknown_030008E0
-	movs r0, 0
-	strh r0, [r1, 0x10]
-	bl SetTextModeAndHideBgs
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end ResetBgs
-
-	thumb_func_start SetBgModeInternal
-@ void SetBgModeInternal(u8 bgMode)
-SetBgModeInternal: @ 8001308
-	lsls r0, 24
-	lsrs r0, 24
-	ldr r3, =gUnknown_030008E0
-	ldrh r2, [r3, 0x10]
-	ldr r1, =0x0000fff8
-	ands r1, r2
-	orrs r1, r0
-	strh r1, [r3, 0x10]
-	bx lr
-	.pool
-	thumb_func_end SetBgModeInternal
-
-	thumb_func_start GetBgMode
-@ u8 GetBgMode()
-GetBgMode: @ 8001324
-	ldr r0, =gUnknown_030008E0
-	ldrb r1, [r0, 0x10]
-	movs r0, 0x7
-	ands r0, r1
-	bx lr
-	.pool
-	thumb_func_end GetBgMode
-
-	thumb_func_start ResetBgControlStructs
-@ void ResetBgControlStructs()
-ResetBgControlStructs: @ 8001334
-	push {lr}
-	ldr r2, =gUnknown_030008E0
-	ldr r0, =gZeroedBgControlStruct
-	ldr r0, [r0]
-	adds r1, r2, 0
-	adds r1, 0xC
-_08001340:
-	str r0, [r1]
-	subs r1, 0x4
-	cmp r1, r2
-	bge _08001340
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end ResetBgControlStructs
-
-	thumb_func_start Unused_ResetBgControlStruct
-@ void Unused_ResetBgControlStruct(u8 bg)
-Unused_ResetBgControlStruct: @ 8001354
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	adds r0, r4, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	cmp r0, 0
-	bne _08001372
-	ldr r1, =gUnknown_030008E0
-	lsls r0, r4, 2
-	adds r0, r1
-	ldr r1, =gZeroedBgControlStruct
-	ldr r1, [r1]
-	str r1, [r0]
-_08001372:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end Unused_ResetBgControlStruct
-
-	thumb_func_start SetBgControlAttributes
-@ void SetBgControlAttributes(u8 bg, u8 tilesBaseBlock, u8 tileMapBaseBlock, u8 screenSize, u8 paletteMode, u8 priority, u8 mosaic, u8 wraparound)
-SetBgControlAttributes: @ 8001380
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x10
-	ldr r4, [sp, 0x30]
-	ldr r5, [sp, 0x34]
-	ldr r6, [sp, 0x38]
-	mov r12, r6
-	ldr r6, [sp, 0x3C]
-	mov r8, r6
-	lsls r0, 24
-	lsrs r7, r0, 24
-	str r7, [sp]
-	lsls r1, 24
-	lsrs r1, 24
-	mov r10, r1
-	lsls r2, 24
-	lsrs r6, r2, 24
-	lsls r3, 24
-	lsrs r3, 24
-	mov r9, r3
-	lsls r4, 24
-	lsrs r4, 24
-	str r4, [sp, 0x4]
-	lsls r5, 24
-	lsrs r5, 24
-	mov r0, r12
-	lsls r0, 24
-	lsrs r4, r0, 24
-	mov r1, r8
-	lsls r1, 24
-	lsrs r1, 24
-	str r1, [sp, 0xC]
-	adds r0, r7, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	lsrs r0, 24
-	mov r12, r0
-	cmp r0, 0
-	bne _08001498
-	ldr r2, =gUnknown_030008E0
-	mov r8, r2
-	mov r0, r10
-	cmp r0, 0xFF
-	beq _080013F4
-	lsls r2, r7, 2
-	add r2, r8
-	movs r1, 0x3
-	ands r1, r0
-	ldrb r3, [r2, 0x1]
-	movs r0, 0x4
-	negs r0, r0
-	ands r0, r3
-	orrs r0, r1
-	strb r0, [r2, 0x1]
-_080013F4:
-	cmp r6, 0xFF
-	beq _0800140C
-	lsls r1, r7, 2
-	add r1, r8
-	movs r0, 0x1F
-	ands r6, r0
-	lsls r3, r6, 2
-	ldrb r2, [r1, 0x1]
-	subs r0, 0x9C
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1, 0x1]
-_0800140C:
-	mov r1, r9
-	cmp r1, 0xFF
-	beq _08001428
-	lsls r1, r7, 2
-	add r1, r8
-	movs r0, 0x3
-	mov r2, r9
-	ands r2, r0
-	lsls r3, r2, 2
-	ldrb r2, [r1]
-	subs r0, 0x10
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1]
-_08001428:
-	ldr r6, [sp, 0x4]
-	cmp r6, 0xFF
-	beq _0800143E
-	lsls r1, r7, 2
-	add r1, r8
-	lsls r3, r6, 7
-	ldrb r2, [r1, 0x1]
-	movs r0, 0x7F
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1, 0x1]
-_0800143E:
-	cmp r5, 0xFF
-	beq _08001456
-	lsls r1, r7, 2
-	add r1, r8
-	movs r0, 0x3
-	ands r5, r0
-	lsls r3, r5, 4
-	ldrb r2, [r1]
-	subs r0, 0x34
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1]
-_08001456:
-	cmp r4, 0xFF
-	beq _0800146E
-	lsls r1, r7, 2
-	add r1, r8
-	movs r0, 0x1
-	ands r4, r0
-	lsls r3, r4, 6
-	ldrb r2, [r1]
-	subs r0, 0x42
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1]
-_0800146E:
-	ldr r0, [sp, 0xC]
-	cmp r0, 0xFF
-	beq _08001484
-	lsls r1, r7, 2
-	add r1, r8
-	lsls r3, r0, 7
-	ldrb r2, [r1]
-	movs r0, 0x7F
-	ands r0, r2
-	orrs r0, r3
-	strb r0, [r1]
-_08001484:
-	ldr r1, [sp]
-	lsls r0, r1, 2
-	add r0, r8
-	mov r2, r12
-	strb r2, [r0, 0x2]
-	strb r2, [r0, 0x3]
-	ldrb r1, [r0]
-	movs r2, 0x1
-	orrs r1, r2
-	strb r1, [r0]
-_08001498:
-	add sp, 0x10
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end SetBgControlAttributes
-
-	thumb_func_start GetBgControlAttribute
-@ u8 GetBgControlAttribute(u8 bg, u8 attributeId)
-GetBgControlAttribute: @ 80014AC
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	lsls r1, 24
-	lsrs r5, r1, 24
-	adds r0, r4, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	cmp r0, 0
-	bne _08001558
-	ldr r1, =gUnknown_030008E0
-	lsls r2, r4, 2
-	adds r0, r2, r1
-	ldrb r0, [r0]
-	lsls r0, 31
-	adds r3, r1, 0
-	cmp r0, 0
-	beq _08001558
-	subs r0, r5, 0x1
-	cmp r0, 0x7
-	bhi _08001558
-	lsls r0, 2
-	ldr r1, =_080014EC
-	adds r0, r1
-	ldr r0, [r0]
-	mov pc, r0
-	.pool
-	.align 2, 0
-_080014EC:
-	.4byte _0800150C
-	.4byte _08001516
-	.4byte _08001520
-	.4byte _0800152A
-	.4byte _08001534
-	.4byte _0800153C
-	.4byte _08001546
-	.4byte _08001550
-_0800150C:
-	adds r0, r2, r3
-	ldrb r0, [r0]
-	lsls r0, 31
-	lsrs r0, 31
-	b _0800155A
-_08001516:
-	adds r0, r2, r3
-	ldrb r0, [r0, 0x1]
-	lsls r0, 30
-	lsrs r0, 30
-	b _0800155A
-_08001520:
-	adds r0, r2, r3
-	ldrb r0, [r0, 0x1]
-	lsls r0, 25
-	lsrs r0, 27
-	b _0800155A
-_0800152A:
-	adds r0, r2, r3
-	ldrb r0, [r0]
-	lsls r0, 28
-	lsrs r0, 30
-	b _0800155A
-_08001534:
-	adds r0, r2, r3
-	ldrb r0, [r0, 0x1]
-	lsrs r0, 7
-	b _0800155A
-_0800153C:
-	adds r0, r2, r3
-	ldrb r0, [r0]
-	lsls r0, 26
-	lsrs r0, 30
-	b _0800155A
-_08001546:
-	adds r0, r2, r3
-	ldrb r0, [r0]
-	lsls r0, 25
-	lsrs r0, 31
-	b _0800155A
-_08001550:
-	adds r0, r2, r3
-	ldrb r0, [r0]
-	lsrs r0, 7
-	b _0800155A
-_08001558:
-	movs r0, 0xFF
-_0800155A:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	thumb_func_end GetBgControlAttribute
-
-	thumb_func_start LoadBgVram
-@ u8 LoadBgVram(u8, void *src, u16 size, u16 destOffset, u8 mode)
-LoadBgVram: @ 8001560
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	mov r8, r1
-	ldr r1, [sp, 0x18]
-	lsls r0, 24
-	lsrs r4, r0, 24
-	lsls r2, 16
-	lsrs r7, r2, 16
-	lsls r3, 16
-	lsrs r6, r3, 16
-	lsls r1, 24
-	lsrs r5, r1, 24
-	adds r0, r4, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	cmp r0, 0
-	bne _080015D8
-	ldr r1, =gUnknown_030008E0
-	lsls r0, r4, 2
-	adds r1, r0, r1
-	ldrb r0, [r1]
-	lsls r0, 31
-	cmp r0, 0
-	beq _080015D8
-	cmp r5, 0x1
-	beq _080015A4
-	cmp r5, 0x2
-	beq _080015AC
-	movs r2, 0xFF
-	b _080015DC
-	.pool
-_080015A4:
-	ldrb r0, [r1, 0x1]
-	lsls r0, 30
-	lsrs r0, 16
-	b _080015B4
-_080015AC:
-	ldrb r0, [r1, 0x1]
-	lsls r0, 25
-	lsrs r0, 27
-	lsls r0, 11
-_080015B4:
-	adds r0, r6, r0
-	lsls r0, 16
-	lsrs r0, 16
-	movs r1, 0xC0
-	lsls r1, 19
-	adds r1, r0, r1
-	mov r0, r8
-	adds r2, r7, 0
-	movs r3, 0
-	bl RequestDma3Copy
-	lsls r0, 24
-	lsrs r2, r0, 24
-	asrs r0, 24
-	movs r1, 0x1
-	negs r1, r1
-	cmp r0, r1
-	bne _080015DC
-_080015D8:
-	movs r0, 0xFF
-	b _080015DE
-_080015DC:
-	adds r0, r2, 0
-_080015DE:
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	thumb_func_end LoadBgVram
-
-	thumb_func_start ShowBgInternal
-@ void ShowBgInternal(u8 bg)
-ShowBgInternal: @ 80015E8
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	adds r0, r4, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	cmp r0, 0
-	bne _08001656
-	ldr r5, =gUnknown_030008E0
-	lsls r0, r4, 2
-	adds r2, r0, r5
-	ldrb r3, [r2]
-	lsls r0, r3, 31
-	cmp r0, 0
-	beq _08001656
-	lsls r1, r3, 26
-	lsrs r1, 30
-	ldrb r2, [r2, 0x1]
-	lsls r0, r2, 30
-	lsrs r0, 28
-	orrs r1, r0
-	movs r0, 0x40
-	ands r0, r3
-	orrs r1, r0
-	lsrs r0, r2, 7
-	lsls r0, 7
-	orrs r1, r0
-	lsls r2, 25
-	lsrs r2, 27
-	lsls r2, 8
-	orrs r1, r2
-	lsrs r0, r3, 7
-	lsls r0, 13
-	orrs r1, r0
-	lsls r0, r3, 28
-	lsrs r0, 30
-	lsls r0, 14
-	orrs r1, r0
-	lsls r0, r4, 25
-	movs r2, 0x80
-	lsls r2, 20
-	adds r0, r2
-	lsrs r0, 24
-	bl SetGpuReg
-	adds r1, r4, 0
-	adds r1, 0x8
-	movs r0, 0x1
-	lsls r0, r1
-	ldrh r1, [r5, 0x10]
-	orrs r0, r1
-	ldr r1, =0x00000f07
-	ands r0, r1
-	strh r0, [r5, 0x10]
-_08001656:
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end ShowBgInternal
-
-	thumb_func_start HideBgInternal
-@ void HideBgInternal(u8 bg)
-HideBgInternal: @ 8001664
-	push {r4,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	adds r0, r4, 0
-	bl IsInvalidBg
-	lsls r0, 24
-	cmp r0, 0
-	bne _0800168A
-	ldr r2, =gUnknown_030008E0
-	adds r0, r4, 0
-	adds r0, 0x8
-	movs r1, 0x1
-	lsls r1, r0
-	ldrh r0, [r2, 0x10]
-	bics r0, r1
-	ldr r1, =0x00000f07
-	ands r0, r1
-	strh r0, [r2, 0x10]
-_0800168A:
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end HideBgInternal
-
-	thumb_func_start SyncBgVisibilityAndMode
-@ void SyncBgVisibilityAndMode()
-SyncBgVisibilityAndMode: @ 8001698
-	push {lr}
-	movs r0, 0
-	bl GetGpuReg
-	ldr r1, =0x0000f0f8
-	ands r1, r0
-	ldr r0, =gUnknown_030008E0
-	ldrh r0, [r0, 0x10]
-	orrs r1, r0
-	movs r0, 0
-	bl SetGpuReg
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end SyncBgVisibilityAndMode
-
-	thumb_func_start SetTextModeAndHideBgs
-@ void SetTextModeAndHideBgs()
-SetTextModeAndHideBgs: @ 80016BC
-	push {lr}
-	movs r0, 0
-	bl GetGpuReg
-	ldr r1, =0x0000f0f8
-	ands r1, r0
-	movs r0, 0
-	bl SetGpuReg
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end SetTextModeAndHideBgs
-
-	thumb_func_start SetBgAffineInternal
-@ void SetBgAffineInternal(u8 bg, u16 srcCenterX, u16 srcCenterY, u16 dispCenterX, u16 dispCenterY, u16 scaleX, u16 scaleY, u16 rotationAngle)
-SetBgAffineInternal: @ 80016D8
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x24
-	mov r12, r1
-	mov r8, r2
-	ldr r1, [sp, 0x3C]
-	ldr r2, [sp, 0x40]
-	ldr r4, [sp, 0x44]
-	ldr r5, [sp, 0x48]
-	lsls r0, 24
-	lsrs r6, r0, 24
-	lsls r3, 16
-	lsrs r3, 16
-	lsls r1, 16
-	lsrs r7, r1, 16
-	lsls r2, 16
-	lsrs r2, 16
-	lsls r4, 16
-	lsrs r4, 16
-	lsls r5, 16
-	lsrs r5, 16
-	ldr r0, =gUnknown_030008E0
-	ldrh r0, [r0, 0x10]
-	movs r1, 0x7
-	ands r1, r0
-	cmp r1, 0x1
-	beq _08001720
-	cmp r1, 0x1
-	ble _08001796
-	cmp r1, 0x2
-	beq _08001726
-	b _08001796
-	.pool
-_08001720:
-	cmp r6, 0x2
-	bne _08001796
-	b _08001730
-_08001726:
-	subs r0, r6, 0x2
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x1
-	bhi _08001796
-_08001730:
-	mov r0, r12
-	str r0, [sp]
-	mov r0, r8
-	str r0, [sp, 0x4]
-	mov r0, sp
-	strh r3, [r0, 0x8]
-	strh r7, [r0, 0xA]
-	strh r2, [r0, 0xC]
-	strh r4, [r0, 0xE]
-	strh r5, [r0, 0x10]
-	add r4, sp, 0x14
-	adds r1, r4, 0
-	movs r2, 0x1
-	bl BgAffineSet
-	ldrh r1, [r4]
-	movs r0, 0x20
-	bl SetGpuReg
-	ldrh r1, [r4, 0x2]
-	movs r0, 0x22
-	bl SetGpuReg
-	ldrh r1, [r4, 0x4]
-	movs r0, 0x24
-	bl SetGpuReg
-	ldrh r1, [r4, 0x6]
-	movs r0, 0x26
-	bl SetGpuReg
-	ldrh r1, [r4]
-	movs r0, 0x20
-	bl SetGpuReg
-	ldrh r1, [r4, 0x8]
-	movs r0, 0x28
-	bl SetGpuReg
-	ldrh r1, [r4, 0xA]
-	movs r0, 0x2A
-	bl SetGpuReg
-	ldrh r1, [r4, 0xC]
-	movs r0, 0x2C
-	bl SetGpuReg
-	ldrh r1, [r4, 0xE]
-	movs r0, 0x2E
-	bl SetGpuReg
-_08001796:
-	add sp, 0x24
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	thumb_func_end SetBgAffineInternal
-
-	thumb_func_start IsInvalidBg
-@ bool8 IsInvalidBg(u8 bg)
-IsInvalidBg: @ 80017A4
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	cmp r0, 0x3
-	bhi _080017B2
-	movs r0, 0
-	b _080017B4
-_080017B2:
-	movs r0, 0x1
-_080017B4:
-	pop {r1}
-	bx r1
-	thumb_func_end IsInvalidBg
-
-	thumb_func_start DummiedOutFireRedLeafGreenTileAllocFunc
-@ int DummiedOutFireRedLeafGreenTileAllocFunc()
-DummiedOutFireRedLeafGreenTileAllocFunc: @ 80017B8
-	movs r0, 0
-	bx lr
-	thumb_func_end DummiedOutFireRedLeafGreenTileAllocFunc
-
-	thumb_func_start ResetBgsAndClearDma3BusyFlags
-@ void ResetBgsAndClearDma3BusyFlags(u32 leftoverFireRedLeafGreenVariable)
-ResetBgsAndClearDma3BusyFlags: @ 80017BC
-	push {r4,lr}
-	adds r4, r0, 0
-	bl ResetBgs
-	ldr r1, =gUnknown_03000938
-	movs r2, 0
-	adds r0, r1, 0
-	adds r0, 0xC
-_080017CC:
-	str r2, [r0]
-	subs r0, 0x4
-	cmp r0, r1
-	bge _080017CC
-	ldr r0, =gUnneededFireRedVariable
-	str r4, [r0]
-	pop {r4}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end ResetBgsAndClearDma3BusyFlags
-
-	thumb_func_start InitBgsFromTemplates
-@ void InitBgsFromTemplates(u8 bgMode, struct BgTemplate *templates, u8 numTemplates)
-InitBgsFromTemplates: @ 80017E8
-	push {r4-r7,lr}
-	mov r7, r10
-	mov r6, r9
-	mov r5, r8
-	push {r5-r7}
-	sub sp, 0x10
-	adds r5, r1, 0
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r2, 24
-	lsrs r4, r2, 24
-	bl SetBgModeInternal
-	bl ResetBgControlStructs
-	cmp r4, 0
-	beq _08001894
-	movs r7, 0
-	ldr r0, =gUnknown_030008F8
-	mov r9, r0
-	movs r2, 0xC
-	add r2, r9
-	mov r10, r2
-	adds r6, r5, 0
-	mov r8, r4
-_0800181A:
-	ldr r4, [r6]
-	lsls r0, r4, 30
-	lsrs r5, r0, 30
-	cmp r5, 0x3
-	bhi _08001886
-	lsls r1, r4, 28
-	lsrs r1, 30
-	lsls r2, r4, 23
-	lsrs r2, 27
-	lsls r3, r4, 21
-	lsrs r3, 30
-	lsls r0, r4, 20
-	lsrs r0, 31
-	str r0, [sp]
-	lsls r0, r4, 18
-	lsrs r0, 30
-	str r0, [sp, 0x4]
-	str r7, [sp, 0x8]
-	str r7, [sp, 0xC]
-	adds r0, r5, 0
-	bl SetBgControlAttributes
-	lsls r4, r5, 4
-	mov r5, r9
-	adds r3, r4, r5
-	ldr r2, [r6]
-	lsls r2, 8
-	lsrs r2, 22
-	ldrh r0, [r3]
-	ldr r5, =0xfffffc00
-	adds r1, r5, 0
-	ands r0, r1
-	orrs r0, r2
-	strh r0, [r3]
-	ldrb r0, [r3, 0x1]
-	movs r2, 0x3D
-	negs r2, r2
-	adds r1, r2, 0
-	ands r0, r1
-	strb r0, [r3, 0x1]
-	ldr r0, [r3]
-	ldr r1, =0x00003fff
-	ands r0, r1
-	str r0, [r3]
-	mov r0, r9
-	adds r0, 0x4
-	adds r0, r4, r0
-	str r7, [r0]
-	mov r0, r9
-	adds r0, 0x8
-	adds r0, r4, r0
-	str r7, [r0]
-	add r4, r10
-	str r7, [r4]
-_08001886:
-	adds r6, 0x4
-	movs r5, 0x1
-	negs r5, r5
-	add r8, r5
-	mov r0, r8
-	cmp r0, 0
-	bne _0800181A
-_08001894:
-	add sp, 0x10
-	pop {r3-r5}
-	mov r8, r3
-	mov r9, r4
-	mov r10, r5
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end InitBgsFromTemplates
-
-	thumb_func_start InitBgFromTemplate
-@ void InitBgFromTemplate(struct BgTemplate *templates)
-InitBgFromTemplate: @ 80018B0
-	push {r4-r7,lr}
-	sub sp, 0x10
-	adds r7, r0, 0
-	ldr r4, [r7]
-	lsls r0, r4, 30
-	lsrs r5, r0, 30
-	cmp r5, 0x3
-	bhi _08001920
-	lsls r1, r4, 28
-	lsrs r1, 30
-	lsls r2, r4, 23
-	lsrs r2, 27
-	lsls r3, r4, 21
-	lsrs r3, 30
-	lsls r0, r4, 20
-	lsrs r0, 31
-	str r0, [sp]
-	lsls r0, r4, 18
-	lsrs r0, 30
-	str r0, [sp, 0x4]
-	movs r6, 0
-	str r6, [sp, 0x8]
-	str r6, [sp, 0xC]
-	adds r0, r5, 0
-	bl SetBgControlAttributes
-	ldr r4, =gUnknown_030008F8
-	lsls r5, 4
-	adds r3, r5, r4
-	ldr r1, [r7]
-	lsls r1, 8
-	lsrs r1, 22
-	ldrh r2, [r3]
-	ldr r0, =0xfffffc00
-	ands r0, r2
-	orrs r0, r1
-	strh r0, [r3]
-	ldrb r1, [r3, 0x1]
-	movs r0, 0x3D
-	negs r0, r0
-	ands r0, r1
-	strb r0, [r3, 0x1]
-	ldr r0, [r3]
-	ldr r1, =0x00003fff
-	ands r0, r1
-	str r0, [r3]
-	adds r0, r4, 0x4
-	adds r0, r5, r0
-	str r6, [r0]
-	adds r0, r4, 0
-	adds r0, 0x8
-	adds r0, r5, r0
-	str r6, [r0]
-	adds r4, 0xC
-	adds r5, r4
-	str r6, [r5]
-_08001920:
-	add sp, 0x10
-	pop {r4-r7}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end InitBgFromTemplate
-
-	thumb_func_start SetBgMode
-@ void SetBgMode(u8 bgMode)
-SetBgMode: @ 8001934
-	push {lr}
-	lsls r0, 24
-	lsrs r0, 24
-	bl SetBgModeInternal
-	pop {r0}
-	bx r0
-	thumb_func_end SetBgMode
-
-	thumb_func_start LoadBgTiles
-@ u8 LoadBgTiles(u8 bg, void *src, u16 size, u16 destOffset)
-LoadBgTiles: @ 8001944
-	push {r4-r7,lr}
-	mov r7, r8
-	push {r7}
-	sub sp, 0x4
-	adds r7, r1, 0
-	lsls r0, 24
-	lsrs r5, r0, 24
-	lsls r2, 16
-	lsrs r2, 16
-	mov r8, r2
-	lsls r3, 16
-	lsrs r4, r3, 16
-	adds r0, r5, 0
-	movs r1, 0x5
-	bl GetBgControlAttribute
-	lsls r0, 16
-	cmp r0, 0
-	bne _08001980
-	ldr r1, =gUnknown_030008F8
-	lsls r0, r5, 4
-	adds r0, r1
-	ldrh r0, [r0]
-	lsls r0, 22
-	lsrs r0, 22
-	adds r0, r4
-	lsls r0, 21
-	b _08001990
-	.pool
-_08001980:
-	ldr r1, =gUnknown_030008F8
-	lsls r0, r5, 4
-	adds r0, r1
-	ldrh r0, [r0]
-	lsls r0, 22
-	lsrs r0, 22
-	adds r0, r4
-	lsls r0, 22
-_08001990:
-	lsrs r4, r0, 16
-	movs r6, 0x1
-	str r6, [sp]
-	adds r0, r5, 0
-	adds r1, r7, 0
-	mov r2, r8
-	adds r3, r4, 0
-	bl LoadBgVram
-	lsls r2, r0, 24
-	lsrs r1, r2, 24
-	adds r7, r1, 0
-	cmp r1, 0xFF
-	bne _080019B8
-	ldr r0, =0x0000ffff
-	b _080019E6
-	.pool
-_080019B8:
-	ldr r0, =gUnknown_03000938
-	lsrs r2, 29
-	lsls r2, 2
-	adds r2, r0
-	movs r0, 0x1F
-	ands r0, r1
-	adds r1, r6, 0
-	lsls r1, r0
-	ldr r0, [r2]
-	orrs r0, r1
-	str r0, [r2]
-	ldr r0, =gUnneededFireRedVariable
-	ldr r0, [r0]
-	cmp r0, 0x1
-	bne _080019E4
-	lsrs r1, r4, 5
-	mov r0, r8
-	lsrs r2, r0, 5
-	adds r0, r5, 0
-	movs r3, 0x1
-	bl DummiedOutFireRedLeafGreenTileAllocFunc
-_080019E4:
-	adds r0, r7, 0
-_080019E6:
-	add sp, 0x4
-	pop {r3}
-	mov r8, r3
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end LoadBgTiles
-
-	thumb_func_start LoadBgTilemap
-@ u8 LoadBgTilemap(u8 bg, void *src, u16 size, u16 destOffset)
-LoadBgTilemap: @ 80019FC
-	push {r4,lr}
-	sub sp, 0x4
-	lsls r0, 24
-	lsrs r0, 24
-	lsls r2, 16
-	lsrs r2, 16
-	lsls r3, 17
-	lsrs r3, 16
-	movs r4, 0x2
-	str r4, [sp]
-	bl LoadBgVram
-	lsls r2, r0, 24
-	lsrs r3, r2, 24
-	cmp r3, 0xFF
-	beq _08001A3C
-	ldr r0, =gUnknown_03000938
-	lsrs r2, 29
-	lsls r2, 2
-	adds r2, r0
-	movs r0, 0x1F
-	ands r0, r3
-	movs r1, 0x1
-	lsls r1, r0
-	ldr r0, [r2]
-	orrs r0, r1
-	str r0, [r2]
-	adds r0, r3, 0
-	b _08001A3E
-	.pool
-_08001A3C:
-	ldr r0, =0x0000ffff
-_08001A3E:
-	add sp, 0x4
-	pop {r4}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end LoadBgTilemap
-
-	thumb_func_start Unused_LoadBgPalette
-@ u8 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
-Unused_LoadBgPalette: @ 8001A4C
-	push {r4-r7,lr}
-	adds r7, r1, 0
-	lsls r0, 24
-	lsrs r4, r0, 24
-	lsls r2, 16
-	lsrs r6, r2, 16
-	lsls r3, 16
-	lsrs r5, r3, 16
-	adds r0, r4, 0
-	bl IsInvalidBg_
-	cmp r0, 0
-	bne _08001A98
-	ldr r1, =gUnknown_030008F8
-	lsls r0, r4, 4
-	adds r0, r1
-	ldrb r1, [r0, 0x1]
-	lsls r1, 26
-	lsrs r1, 28
-	lsls r1, 5
-	lsls r0, r5, 1
-	adds r1, r0
-	lsls r1, 16
-	lsrs r1, 16
-	movs r0, 0xA0
-	lsls r0, 19
-	adds r1, r0
-	adds r0, r7, 0
-	adds r2, r6, 0
-	movs r3, 0
-	bl RequestDma3Copy
-	lsls r3, r0, 24
-	asrs r1, r3, 24
-	movs r0, 0x1
-	negs r0, r0
-	cmp r1, r0
-	bne _08001AA4
-_08001A98:
-	ldr r0, =0x0000ffff
-	b _08001AC8
-	.pool
-_08001AA4:
-	ldr r4, =gUnknown_03000938
-	adds r0, r1, 0
-	cmp r1, 0
-	bge _08001AAE
-	adds r0, 0x1F
-_08001AAE:
-	asrs r0, 5
-	lsls r2, r0, 2
-	adds r2, r4
-	lsls r0, 5
-	subs r0, r1, r0
-	lsls r0, 24
-	asrs r0, 24
-	movs r1, 0x1
-	lsls r1, r0
-	ldr r0, [r2]
-	orrs r0, r1
-	str r0, [r2]
-	lsrs r0, r3, 24
-_08001AC8:
-	pop {r4-r7}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end Unused_LoadBgPalette
-
 	thumb_func_start IsDma3ManagerBusyWithBgCopy
 @ bool8 IsDma3ManagerBusyWithBgCopy()
 IsDma3ManagerBusyWithBgCopy: @ 8001AD4
@@ -1371,7 +308,7 @@ ChangeBgX: @ 8001D04
 	lsls r2, 24
 	lsrs r5, r2, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08001D28
 	adds r0, r4, 0
@@ -1522,7 +459,7 @@ GetBgX: @ 8001E40
 	lsls r0, 24
 	lsrs r0, 24
 	adds r4, r0, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08001E70
 	adds r0, r4, 0
@@ -1557,7 +494,7 @@ ChangeBgY: @ 8001E7C
 	lsls r2, 24
 	lsrs r5, r2, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08001EA0
 	adds r0, r4, 0
@@ -1711,7 +648,7 @@ ChangeBgY_ScreenOff: @ 8001FB8
 	lsls r2, 24
 	lsrs r5, r2, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08001FDC
 	adds r0, r4, 0
@@ -1862,7 +799,7 @@ GetBgY: @ 80020F4
 	lsls r0, 24
 	lsrs r0, 24
 	adds r4, r0, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08002124
 	adds r0, r4, 0
@@ -2053,7 +990,7 @@ SetBgTilemapBuffer: @ 8002250
 	lsls r0, 24
 	lsrs r4, r0, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _0800227A
 	adds r0, r4, 0
@@ -2081,7 +1018,7 @@ UnsetBgTilemapBuffer: @ 8002284
 	lsls r0, 24
 	lsrs r4, r0, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	adds r5, r0, 0
 	cmp r5, 0
 	bne _080022AE
@@ -2110,7 +1047,7 @@ GetBgTilemapBuffer: @ 80022B8
 	lsls r0, 24
 	lsrs r0, 24
 	adds r4, r0, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _080022E8
 	adds r0, r4, 0
@@ -2152,7 +1089,7 @@ CopyToBgTilemapBuffer: @ 80022F0
 	lsrs r5, r3, 16
 	mov r8, r5
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _08002358
 	adds r0, r4, 0
@@ -2204,7 +1141,7 @@ CopyBgTilemapBufferToVram: @ 800236C
 	lsls r0, 24
 	lsrs r4, r0, 24
 	adds r0, r4, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _080023C8
 	adds r0, r4, 0
@@ -2276,7 +1213,7 @@ CopyToBgTilemapBufferRect: @ 80023D4
 	lsls r4, 24
 	lsrs r6, r4, 24
 	adds r0, r5, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _080024C4
 	adds r0, r5, 0
@@ -2483,7 +1420,7 @@ CopyRectToBgTilemapBufferRect: @ 800251C
 	lsrs r0, 16
 	str r0, [sp, 0x24]
 	ldr r0, [sp, 0x4]
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	beq _08002592
 	b _080026EE
@@ -2701,7 +1638,7 @@ FillBgTilemapBufferRect_Palette0: @ 8002704
 	lsls r5, 24
 	lsrs r5, 24
 	adds r0, r6, 0
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	bne _080027F0
 	adds r0, r6, 0
@@ -2880,7 +1817,7 @@ WriteSequenceToBgTilemapBuffer: @ 8002840
 	lsrs r0, 16
 	str r0, [sp, 0x10]
 	mov r0, r9
-	bl IsInvalidBg_
+	bl IsInvalidBgDuplicate
 	cmp r0, 0
 	beq _0800288E
 	b _080029D4
@@ -3320,9 +2257,9 @@ _08002B90:
 	.pool
 	thumb_func_end GetBgType
 
-	thumb_func_start IsInvalidBg_
-@ bool8 IsInvalidBg_(u8 bg)
-IsInvalidBg_: @ 8002B9C
+	thumb_func_start IsInvalidBgDuplicate
+@ bool8 IsInvalidBgDuplicate(u8 bg)
+IsInvalidBgDuplicate: @ 8002B9C
 	push {lr}
 	lsls r0, 24
 	lsrs r0, 24
@@ -3335,7 +2272,7 @@ _08002BAA:
 _08002BAC:
 	pop {r1}
 	bx r1
-	thumb_func_end IsInvalidBg_
+	thumb_func_end IsInvalidBgDuplicate
 
 	thumb_func_start IsTileMapOutsideWram
 @ bool8 IsTileMapOutsideWram(u8 bg)
diff --git a/ld_script.txt b/ld_script.txt
index d0ae744d1..6668cf5d6 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -42,6 +42,7 @@ SECTIONS {
         src/malloc.o(.text);
         src/dma3_manager.o(.text);
         src/gpu_regs.o(.text);
+        src/bg.o(.text);
         asm/bg.o(.text);
         asm/blit.o(.text);
         src/window.o(.text);
diff --git a/src/bg.c b/src/bg.c
new file mode 100644
index 000000000..4130e4bab
--- /dev/null
+++ b/src/bg.c
@@ -0,0 +1,533 @@
+#include "global.h"
+#include "dma3.h"
+
+#define DISPCNT_ALL_BG_AND_MODE_BITS    0x0F07
+#define SECONDARY_TILESET_BASE_TILE     0x4000
+#define SECONDARY_TILESET_BASE_BLOCK    0x800
+
+struct BgControl {
+    struct BgConfig {
+        u16 visible:1;
+        u16 unknown_1:1;
+        u16 screenSize:2;
+        u16 priority:2;
+        u16 mosaic:1;
+        u16 wraparound:1;
+        
+        u16 tilesBaseBlock:2;
+        u16 tileMapBaseBlock:5;
+        u16 paletteMode:1;
+        
+        u8 unknown_2;
+        u8 unknown_3;
+    } configs[4];
+    
+    u16 bgVisibilityAndMode;
+};
+
+struct BgTemplate {
+    u32 bg:2;
+    u32 tilesBaseBlock:2;
+    u32 tileMapBaseBlock:5;
+    u32 screenSize:2;
+    u32 paletteMode:1;
+    u32 priority:2;
+    u32 unk_1:10;
+};
+
+struct BgConfig2 {
+    u32 unk_1:10;
+    u32 unk_2:4;
+    u32 unk_3:18;
+    
+    u32 unk_4;
+    u32 unk_5;
+    u32 unk_6;
+};
+
+extern struct BgControl gUnknown_030008E0;    // gGpuBgConfigs
+extern struct BgConfig2 gUnknown_030008F8[4]; // gGpuBgConfigs2
+extern u32 gUnknown_03000938[4];
+extern u32 gUnneededFireRedVariable;
+extern struct BgConfig gZeroedBgControlStruct;
+extern bool32 IsInvalidBgDuplicate(u8 bg);
+
+void ResetBgControlStructs();
+
+extern void SetTextModeAndHideBgs();
+extern bool8 IsInvalidBg(u8 bg);
+extern void SetGpuReg(u8 regOffset, u16 value);
+extern u16 GetGpuReg(u8 regOffset);
+
+void ResetBgs(void)
+{
+    ResetBgControlStructs();
+    gUnknown_030008E0.bgVisibilityAndMode = 0;
+    SetTextModeAndHideBgs();
+}
+
+void SetBgModeInternal(u8 bgMode)
+{
+    gUnknown_030008E0.bgVisibilityAndMode &= 0xFFF8;
+    gUnknown_030008E0.bgVisibilityAndMode |= bgMode;
+}
+
+u8 GetBgMode(void)
+{
+    return gUnknown_030008E0.bgVisibilityAndMode & 0x7;
+}
+
+void ResetBgControlStructs(void)
+{
+    struct BgConfig* bgConfigs = &gUnknown_030008E0.configs[0];
+    struct BgConfig zeroedConfig = gZeroedBgControlStruct;
+    int i;
+    
+    for (i = 0; i < 4; i++)
+    {
+        bgConfigs[i] = zeroedConfig;
+    }
+}
+
+void Unused_ResetBgControlStruct(u8 bg)
+{
+    if (IsInvalidBg(bg) == FALSE)
+    {
+        gUnknown_030008E0.configs[bg] = gZeroedBgControlStruct;
+    }
+}
+
+void SetBgControlAttributes(u8 bg, u8 tilesBaseBlock, u8 tileMapBaseBlock, u8 screenSize, u8 paletteMode, u8 priority, u8 mosaic, u8 wraparound)
+{
+    if (IsInvalidBg(bg) == FALSE)
+    {
+        if (tilesBaseBlock != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].tilesBaseBlock = tilesBaseBlock & 0x3;
+        }
+        
+        if (tileMapBaseBlock != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].tileMapBaseBlock = tileMapBaseBlock & 0x1F;
+        }
+        
+        if (screenSize != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].screenSize = screenSize & 0x3;
+        }
+        
+        if (paletteMode != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].paletteMode = paletteMode;
+        }
+        
+        if (priority != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].priority = priority & 0x3;
+        }
+        
+        if (mosaic != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].mosaic = mosaic & 0x1;
+        }
+        
+        if (wraparound != 0xFF)
+        {
+            gUnknown_030008E0.configs[bg].wraparound = wraparound;
+        }
+        
+        gUnknown_030008E0.configs[bg].unknown_2 = 0;
+        gUnknown_030008E0.configs[bg].unknown_3 = 0;
+        
+        gUnknown_030008E0.configs[bg].visible = 1;
+    }
+}
+
+u16 GetBgControlAttribute(u8 bg, u8 attributeId)
+{
+    if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+    {
+        switch (attributeId)
+        {
+            case 1:
+                return gUnknown_030008E0.configs[bg].visible;
+            case 2:
+                return gUnknown_030008E0.configs[bg].tilesBaseBlock;
+            case 3:
+                return gUnknown_030008E0.configs[bg].tileMapBaseBlock;
+            case 4:
+                return gUnknown_030008E0.configs[bg].screenSize;
+            case 5:
+                return gUnknown_030008E0.configs[bg].paletteMode;
+            case 6:
+                return gUnknown_030008E0.configs[bg].priority;
+            case 7:
+                return gUnknown_030008E0.configs[bg].mosaic;
+            case 8:
+                return gUnknown_030008E0.configs[bg].wraparound;
+        }
+    }
+    
+    return 0xFF;
+}
+
+u8 LoadBgVram(u8 bg, void *src, u16 size, u16 destOffset, u8 mode)
+{
+    u16 offset;
+    s8 cursor;
+    
+    if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+    {
+        switch (mode)
+        {
+            case 0x1:
+                offset = gUnknown_030008E0.configs[bg].tilesBaseBlock * SECONDARY_TILESET_BASE_TILE;
+                break;
+            case 0x2:
+                offset = gUnknown_030008E0.configs[bg].tileMapBaseBlock * SECONDARY_TILESET_BASE_BLOCK;
+                break;
+            default:
+                cursor = -1;
+                goto end;
+        }
+        
+        offset = destOffset + offset;
+        
+        cursor = RequestDma3Copy(src, (void*)(offset + BG_VRAM), size, 0);
+        
+        if (cursor == -1)
+        {
+            return -1;
+        }
+    }
+    else
+    {
+       return -1;
+    }
+    
+end:
+    return cursor;
+}
+
+void ShowBgInternal(u8 bg)
+{
+    u16 value;
+    if (IsInvalidBg(bg) == FALSE && gUnknown_030008E0.configs[bg].visible != FALSE)
+    {
+        value = gUnknown_030008E0.configs[bg].priority |
+                (gUnknown_030008E0.configs[bg].tilesBaseBlock << 2) |
+                (gUnknown_030008E0.configs[bg].mosaic << 6) |
+                (gUnknown_030008E0.configs[bg].paletteMode << 7) |
+                (gUnknown_030008E0.configs[bg].tileMapBaseBlock << 8) |
+                (gUnknown_030008E0.configs[bg].wraparound << 13) |
+                (gUnknown_030008E0.configs[bg].screenSize << 14);
+        
+        SetGpuReg((bg << 1) + 0x8, value);
+        
+        gUnknown_030008E0.bgVisibilityAndMode |= 1 << (bg + 8);
+        gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
+    }
+}
+
+void HideBgInternal(u8 bg)
+{
+    if (IsInvalidBg(bg) == FALSE)
+    {
+        gUnknown_030008E0.bgVisibilityAndMode &= ~(1 << (bg + 8));
+        gUnknown_030008E0.bgVisibilityAndMode &= DISPCNT_ALL_BG_AND_MODE_BITS;
+    }
+}
+
+void SyncBgVisibilityAndMode()
+{
+    SetGpuReg(0, (GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS) | gUnknown_030008E0.bgVisibilityAndMode);
+}
+
+void SetTextModeAndHideBgs()
+{
+    SetGpuReg(0, GetGpuReg(0) & ~DISPCNT_ALL_BG_AND_MODE_BITS);
+}
+
+void SetBgAffineInternal(u8 bg, u32 srcCenterX, u32 srcCenterY, u16 dispCenterX, u16 dispCenterY, u16 scaleX, u16 scaleY, u16 rotationAngle)
+{
+    struct BgAffineSrcData src;
+    struct BgAffineDstData dest;
+    
+    switch (gUnknown_030008E0.bgVisibilityAndMode & 0x7)
+    {
+        case 1:
+            if (bg != 2)
+                return;
+            break;
+        case 2:
+            if (bg < 2 || bg > 3)
+                return;
+            break;
+        case 0:
+        default:
+            return;
+    }
+    
+    src.texX = srcCenterX;
+    src.texY = srcCenterY;
+    src.scrX = dispCenterX;
+    src.scrY = dispCenterY;
+    src.sx = scaleX;
+    src.sy = scaleY;
+    src.alpha = rotationAngle;
+    
+    BgAffineSet(&src, &dest, 1);
+
+    SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
+    SetGpuReg(REG_OFFSET_BG2PB, dest.pb);
+    SetGpuReg(REG_OFFSET_BG2PC, dest.pc);
+    SetGpuReg(REG_OFFSET_BG2PD, dest.pd);
+    SetGpuReg(REG_OFFSET_BG2PA, dest.pa);
+    SetGpuReg(REG_OFFSET_BG2X_L, (s16)(dest.dx));
+    SetGpuReg(REG_OFFSET_BG2X_H, (s16)(dest.dx >> 16));
+    SetGpuReg(REG_OFFSET_BG2Y_L, (s16)(dest.dy));
+    SetGpuReg(REG_OFFSET_BG2Y_H, (s16)(dest.dy >> 16));
+}
+
+bool8 IsInvalidBg(u8 bg)
+{
+    if (bg > 3)
+        return TRUE;
+    return FALSE;
+}
+
+int DummiedOutFireRedLeafGreenTileAllocFunc(int a1, int a2, int a3, int a4)
+{
+    return 0;
+}
+
+void ResetBgsAndClearDma3BusyFlags(u32 leftoverFireRedLeafGreenVariable)
+{
+    int i;
+    ResetBgs();
+    
+    for (i = 0; i < 4; i++)
+    {
+        gUnknown_03000938[i] = 0;
+    }
+    
+    gUnneededFireRedVariable = leftoverFireRedLeafGreenVariable;
+}
+
+void InitBgsFromTemplates(u8 bgMode, struct BgTemplate *templates, u8 numTemplates)
+{
+    int i;
+    u8 bg;
+    
+    SetBgModeInternal(bgMode);
+    ResetBgControlStructs();
+
+    for (i = 0; i < numTemplates; i++)
+    {
+        bg = templates[i].bg;
+        if (bg < 4) {
+            SetBgControlAttributes(bg,
+                                   templates[i].tilesBaseBlock,
+                                   templates[i].tileMapBaseBlock,
+                                   templates[i].screenSize,
+                                   templates[i].paletteMode,
+                                   templates[i].priority,
+                                   0,
+                                   0);
+            
+            gUnknown_030008F8[bg].unk_1 = templates[i].unk_1;
+            gUnknown_030008F8[bg].unk_2 = 0;
+            gUnknown_030008F8[bg].unk_3 = 0;
+            
+            gUnknown_030008F8[bg].unk_4 = 0;
+            gUnknown_030008F8[bg].unk_5 = 0;
+            gUnknown_030008F8[bg].unk_6 = 0;
+        }
+    }
+}
+
+void InitBgFromTemplate(struct BgTemplate *template)
+{
+    u8 bg = template->bg;
+    
+    if (bg < 4)
+    {
+        SetBgControlAttributes(bg,
+                               template->tilesBaseBlock,
+                               template->tileMapBaseBlock,
+                               template->screenSize,
+                               template->paletteMode,
+                               template->priority,
+                               0,
+                               0);
+        
+        gUnknown_030008F8[bg].unk_1 = template->unk_1;
+        gUnknown_030008F8[bg].unk_2 = 0;
+        gUnknown_030008F8[bg].unk_3 = 0;
+        
+        gUnknown_030008F8[bg].unk_4 = 0;
+        gUnknown_030008F8[bg].unk_5 = 0;
+        gUnknown_030008F8[bg].unk_6 = 0;
+    }
+}
+
+void SetBgMode(u8 bgMode)
+{
+    SetBgModeInternal(bgMode);
+}
+
+u16 LoadBgTiles(u8 bg, void *src, u16 size, u16 destOffset)
+{
+    u16 unk;
+    u8 cursor;
+    
+    if (GetBgControlAttribute(bg, 5) == 0)
+    {
+        unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x20;
+    }
+    else
+    {
+        unk = (gUnknown_030008F8[bg].unk_1 + destOffset) * 0x40;
+    }
+    
+    cursor = LoadBgVram(bg, src, size, unk, DISPCNT_MODE_1);
+    
+    if (cursor == 0xFF)
+    {
+        return -1;
+    }
+    
+    gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
+    
+    if (gUnneededFireRedVariable == 1)
+    {
+        DummiedOutFireRedLeafGreenTileAllocFunc(bg, unk >> 5, size >> 5, 1);
+    }
+    
+    return cursor;
+}
+
+u16 LoadBgTilemap(u8 bg, void *src, u16 size, u16 destOffset)
+{
+    u8 cursor;
+    
+    cursor = LoadBgVram(bg, src, size, destOffset * 2, DISPCNT_MODE_2);
+    
+    if (cursor == 0xFF)
+    {
+        return -1;
+    }
+    
+    gUnknown_03000938[cursor >> 5] |= (1 << (cursor & 0x1F));
+    
+    return cursor;
+}
+
+#ifdef NONMATCHING
+u16 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
+{
+    u16 unk_1;
+    s8 cursor;
+    int cursor2;
+    u32* ptr;
+    
+    if (IsInvalidBgDuplicate(bg) == FALSE)
+    {
+        unk_1 = (gUnknown_030008F8[bg].unk_2 * 0x20) + (destOffset * 2);
+        cursor = RequestDma3Copy(src, (void*)(unk_1 + BG_PLTT), size, 0);
+        cursor2 = cursor;
+    }
+    else
+    {
+        return -1;
+    }
+    
+    if (cursor == -1)
+    {
+        return -1;
+    }
+
+    ptr = gUnknown_03000938;
+    
+    if (cursor < 0)
+    {
+        cursor2 += 0x1F;
+    }
+    
+    cursor2 >>= 5;
+    
+    ptr[cursor2] |= (1 << (s8)(cursor - (cursor2 << 5)));
+
+    return (u8)cursor;
+}
+#else
+__attribute__((naked))
+u8 Unused_LoadBgPalette(u8 bg, void *src, u16 size, u16 destOffset)
+{
+    asm("push {r4-r7,lr}\n\
+    add r7, r1, #0\n\
+    lsl r0, #24\n\
+    lsr r4, r0, #24\n\
+    lsl r2, #16\n\
+    lsr r6, r2, #16\n\
+    lsl r3, #16\n\
+    lsr r5, r3, #16\n\
+    add r0, r4, #0\n\
+    bl IsInvalidBgDuplicate\n\
+    cmp r0, #0\n\
+    bne _08001A98\n\
+    ldr r1, =gUnknown_030008F8\n\
+    lsl r0, r4, #4\n\
+    add r0, r1\n\
+    ldrb r1, [r0, #0x1]\n\
+    lsl r1, #26\n\
+    lsr r1, #28\n\
+    lsl r1, #5\n\
+    lsl r0, r5, #1\n\
+    add r1, r0\n\
+    lsl r1, #16\n\
+    lsr r1, #16\n\
+    mov r0, #0xA0\n\
+    lsl r0, #19\n\
+    add r1, r0\n\
+    add r0, r7, #0\n\
+    add r2, r6, #0\n\
+    mov r3, #0\n\
+    bl RequestDma3Copy\n\
+    lsl r3, r0, #24\n\
+    asr r1, r3, #24\n\
+    mov r0, #0x1\n\
+    neg r0, r0\n\
+    cmp r1, r0\n\
+    bne _08001AA4\n\
+_08001A98:\n\
+    ldr r0, =0x0000ffff\n\
+    b _08001AC8\n\
+    .pool\n\
+_08001AA4:\n\
+    ldr r4, =gUnknown_03000938\n\
+    add r0, r1, #0\n\
+    cmp r1, #0\n\
+    bge _08001AAE\n\
+    add r0, #0x1F\n\
+_08001AAE:\n\
+    asr r0, #5\n\
+    lsl r2, r0, #2\n\
+    add r2, r4\n\
+    lsl r0, #5\n\
+    sub r0, r1, r0\n\
+    lsl r0, #24\n\
+    asr r0, #24\n\
+    mov r1, #0x1\n\
+    lsl r1, r0\n\
+    ldr r0, [r2]\n\
+    orr r0, r1\n\
+    str r0, [r2]\n\
+    lsr r0, r3, #24\n\
+_08001AC8:\n\
+    pop {r4-r7}\n\
+    pop {r1}\n\
+    bx r1\n\
+    .pool");
+}
+#endif // NONMATCHING