help_system: through sub_813BC5C

asm/help_system.s

@@ -5,176 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_813BB38
-sub_813BB38: @ 813BB38
-	ldr r2, _0813BB60 @ =gUnknown_203F178
-	ldr r1, _0813BB64 @ =gMain
-	ldr r0, [r1, 0xC]
-	str r0, [r2]
-	ldr r0, [r1, 0x10]
-	str r0, [r2, 0x4]
-	movs r0, 0
-	str r0, [r1, 0xC]
-	str r0, [r1, 0x10]
-	ldr r1, _0813BB68 @ =0x040000b0
-	ldrh r2, [r1, 0xA]
-	ldr r0, _0813BB6C @ =0x0000c5ff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r2, [r1, 0xA]
-	ldr r0, _0813BB70 @ =0x00007fff
-	ands r0, r2
-	strh r0, [r1, 0xA]
-	ldrh r0, [r1, 0xA]
-	bx lr
-	.align 2, 0
-_0813BB60: .4byte gUnknown_203F178
-_0813BB64: .4byte gMain
-_0813BB68: .4byte 0x040000b0
-_0813BB6C: .4byte 0x0000c5ff
-_0813BB70: .4byte 0x00007fff
-	thumb_func_end sub_813BB38
-
-	thumb_func_start sub_813BB74
-sub_813BB74: @ 813BB74
-	push {r4,lr}
-	movs r0, 0
-	bl GetGpuReg
-	ldr r4, _0813BBA8 @ =gUnknown_203F178
-	strh r0, [r4, 0x8]
-	movs r0, 0x8
-	bl GetGpuReg
-	strh r0, [r4, 0xA]
-	movs r0, 0x10
-	bl GetGpuReg
-	strh r0, [r4, 0xC]
-	movs r0, 0x12
-	bl GetGpuReg
-	strh r0, [r4, 0xE]
-	movs r0, 0x50
-	bl GetGpuReg
-	strh r0, [r4, 0x10]
-	pop {r4}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BBA8: .4byte gUnknown_203F178
-	thumb_func_end sub_813BB74
-
-	thumb_func_start sub_813BBAC
-sub_813BBAC: @ 813BBAC
-	push {lr}
-	ldr r0, _0813BBC0 @ =0x0600c000
-	ldr r1, _0813BBC4 @ =gUnknown_203B174
-	movs r2, 0x80
-	lsls r2, 7
-	movs r3, 0
-	bl RequestDma3Copy
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BBC0: .4byte 0x0600c000
-_0813BBC4: .4byte gUnknown_203B174
-	thumb_func_end sub_813BBAC
-
-	thumb_func_start sub_813BBC8
-sub_813BBC8: @ 813BBC8
-	push {lr}
-	ldr r0, _0813BBD8 @ =gUnknown_203F178 + 0x12
-	adds r1, r0, 0x1
-	adds r2, r0, 0x2
-	bl SaveTextColors
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BBD8: .4byte gUnknown_203F178 + 0x12
-	thumb_func_end sub_813BBC8
-
-	thumb_func_start sub_813BBDC
-sub_813BBDC: @ 813BBDC
-	ldr r2, _0813BBEC @ =gMain
-	ldr r1, _0813BBF0 @ =gUnknown_203F178
-	ldr r0, [r1]
-	str r0, [r2, 0xC]
-	ldr r0, [r1, 0x4]
-	str r0, [r2, 0x10]
-	bx lr
-	.align 2, 0
-_0813BBEC: .4byte gMain
-_0813BBF0: .4byte gUnknown_203F178
-	thumb_func_end sub_813BBDC
-
-	thumb_func_start sub_813BBF4
-sub_813BBF4: @ 813BBF4
-	push {r4,lr}
-	ldr r4, _0813BC28 @ =gUnknown_203F178
-	ldrh r1, [r4, 0x10]
-	movs r0, 0x50
-	bl SetGpuReg
-	ldrh r1, [r4, 0xC]
-	movs r0, 0x10
-	bl SetGpuReg
-	ldrh r1, [r4, 0xE]
-	movs r0, 0x12
-	bl SetGpuReg
-	ldrh r1, [r4, 0xA]
-	movs r0, 0x8
-	bl SetGpuReg
-	ldrh r1, [r4, 0x8]
-	movs r0, 0
-	bl SetGpuReg
-	pop {r4}
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BC28: .4byte gUnknown_203F178
-	thumb_func_end sub_813BBF4
-
-	thumb_func_start sub_813BC2C
-sub_813BC2C: @ 813BC2C
-	push {lr}
-	ldr r0, _0813BC40 @ =gUnknown_203B174
-	ldr r1, _0813BC44 @ =0x0600c000
-	movs r2, 0x80
-	lsls r2, 7
-	movs r3, 0
-	bl RequestDma3Copy
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BC40: .4byte gUnknown_203B174
-_0813BC44: .4byte 0x0600c000
-	thumb_func_end sub_813BC2C
-
-	thumb_func_start sub_813BC48
-sub_813BC48: @ 813BC48
-	push {lr}
-	ldr r0, _0813BC58 @ =gUnknown_203F178 + 0x12
-	adds r1, r0, 0x1
-	adds r2, r0, 0x2
-	bl RestoreTextColors
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BC58: .4byte gUnknown_203F178 + 0x12
-	thumb_func_end sub_813BC48
-
-	thumb_func_start sub_813BC5C
-sub_813BC5C: @ 813BC5C
-	push {lr}
-	ldr r0, _0813BC70 @ =gDecompressionBuffer
-	ldr r1, _0813BC74 @ =0x0600c000
-	movs r2, 0x80
-	lsls r2, 7
-	movs r3, 0
-	bl RequestDma3Copy
-	pop {r0}
-	bx r0
-	.align 2, 0
-_0813BC70: .4byte gDecompressionBuffer
-_0813BC74: .4byte 0x0600c000
-	thumb_func_end sub_813BC5C
-
 	thumb_func_start sub_813BC78
 sub_813BC78: @ 813BC78
 	push {r4-r7,lr}

src/help_system.c

@@ -8,8 +8,24 @@
 #include "list_menu.h"
 #include "sound.h"
 #include "strings.h"
+#include "text.h"
 #include "constants/songs.h"
 
+struct DmaController
+{
+    void * dest;
+    void * src;
+    u32 size:21;
+    u32 destMode:2;
+    u32 srcMode:2;
+    u32 repeat:1;
+    u32 width:1;
+    u32 dreqOn:1;
+    u32 startMode:3;
+    u32 intrEnable:1;
+    u32 dmaEnable:1;
+};
+
 struct HelpSystemVideoState
 {
     /*0x00*/ MainCallback savedVblankCb;
@@ -19,7 +35,7 @@ struct HelpSystemVideoState
     /*0x0c*/ u16 savedBg0Hofs;
     /*0x0e*/ u16 savedBg0Vofs;
     /*0x10*/ u16 savedBldCnt;
-    /*0x12*/ u8 savedTextColor[3];
+    /*0x12*/ struct TextColor savedTextColor;
     /*0x15*/ u8 state;
 };
 
@@ -38,7 +54,7 @@ void sub_813BC5C(void);
 void sub_813C454(const u8 * str);
 void sub_813C5D4(void);
 
-EWRAM_DATA u8 gUnknown_203B174[0x4000] = {0};
+EWRAM_DATA u8 gUnknown_203B174[BG_CHAR_SIZE] = {0};
 EWRAM_DATA u8 gUnknown_203F174 = 0;
 EWRAM_DATA u8 gUnknown_203F175 = 0;
 EWRAM_DATA u8 gUnknown_203F176 = 0;
@@ -148,3 +164,74 @@ u8 sub_813B870(void)
     }
     return gUnknown_203F178.state;
 }
+
+void sub_813BB38(void)
+{
+    vu16 * dma;
+    gUnknown_203F178.savedVblankCb = gMain.vblankCallback;
+    gUnknown_203F178.savedHblankCb = gMain.hblankCallback;
+    gMain.vblankCallback = NULL;
+    gMain.hblankCallback = NULL;
+
+    dma = (void *)REG_ADDR_DMA0;
+    dma[5] &= ~(DMA_START_MASK | DMA_DREQ_ON | DMA_REPEAT);
+    dma[5] &= ~DMA_ENABLE;
+    dma[5];
+}
+
+void sub_813BB74(void)
+{
+    gUnknown_203F178.savedDispCnt = GetGpuReg(REG_OFFSET_DISPCNT);
+    gUnknown_203F178.savedBg0Cnt = GetGpuReg(REG_OFFSET_BG0CNT);
+    gUnknown_203F178.savedBg0Hofs = GetGpuReg(REG_OFFSET_BG0HOFS);
+    gUnknown_203F178.savedBg0Vofs = GetGpuReg(REG_OFFSET_BG0VOFS);
+    gUnknown_203F178.savedBldCnt = GetGpuReg(REG_OFFSET_BLDCNT);
+}
+
+void sub_813BBAC(void)
+{
+    RequestDma3Copy((void *)BG_CHAR_ADDR(3), gUnknown_203B174, BG_CHAR_SIZE, 0);
+}
+
+void sub_813BBC8(void)
+{
+    SaveTextColors(
+        &gUnknown_203F178.savedTextColor.fgColor,
+        &gUnknown_203F178.savedTextColor.bgColor,
+        &gUnknown_203F178.savedTextColor.shadowColor
+    );
+}
+
+void sub_813BBDC(void)
+{
+    gMain.vblankCallback = gUnknown_203F178.savedVblankCb;
+    gMain.hblankCallback = gUnknown_203F178.savedHblankCb;
+}
+
+void sub_813BBF4(void)
+{
+    SetGpuReg(REG_OFFSET_BLDCNT, gUnknown_203F178.savedBldCnt);
+    SetGpuReg(REG_OFFSET_BG0HOFS, gUnknown_203F178.savedBg0Hofs);
+    SetGpuReg(REG_OFFSET_BG0VOFS, gUnknown_203F178.savedBg0Vofs);
+    SetGpuReg(REG_OFFSET_BG0CNT, gUnknown_203F178.savedBg0Cnt);
+    SetGpuReg(REG_OFFSET_DISPCNT, gUnknown_203F178.savedDispCnt);
+}
+
+void sub_813BC2C(void)
+{
+    RequestDma3Copy(gUnknown_203B174, (void *)BG_CHAR_ADDR(3), BG_CHAR_SIZE, 0);
+}
+
+void sub_813BC48(void)
+{
+    RestoreTextColors(
+        &gUnknown_203F178.savedTextColor.fgColor,
+        &gUnknown_203F178.savedTextColor.bgColor,
+        &gUnknown_203F178.savedTextColor.shadowColor
+    );
+}
+
+void sub_813BC5C(void)
+{
+    RequestDma3Copy(gDecompressionBuffer, (void *)BG_CHAR_ADDR(3), BG_CHAR_SIZE, 0);
+}