Start decompiling field_region_map

asm/field_region_map.s

@@ -5,107 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_817018C
-sub_817018C: @ 817018C
-	push {r4,r5,lr}
-	adds r5, r0, 0
-	movs r0, 0
-	bl SetVBlankCallback
-	ldr r4, =gUnknown_0203BCD0
-	movs r0, 0x89
-	lsls r0, 4
-	bl Alloc
-	str r0, [r4]
-	ldr r1, =0x0000088c
-	adds r2, r0, r1
-	movs r1, 0
-	strh r1, [r2]
-	str r5, [r0]
-	ldr r0, =sub_81701C4
-	bl SetMainCallback2
-	pop {r4,r5}
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_817018C
-
-	thumb_func_start sub_81701C4
-sub_81701C4: @ 81701C4
-	push {lr}
-	movs r0, 0
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x10
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x12
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x14
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x16
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x18
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1A
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1C
-	movs r1, 0
-	bl SetGpuReg
-	movs r0, 0x1E
-	movs r1, 0
-	bl SetGpuReg
-	bl ResetSpriteData
-	bl FreeAllSpritePalettes
-	movs r0, 0
-	bl ResetBgsAndClearDma3BusyFlags
-	ldr r1, =gUnknown_085E5068
-	movs r0, 0x1
-	movs r2, 0x2
-	bl InitBgsFromTemplates
-	ldr r0, =gUnknown_085E5070
-	bl InitWindows
-	bl DeactivateAllTextPrinters
-	movs r0, 0
-	movs r1, 0x27
-	movs r2, 0xD0
-	bl sub_809882C
-	bl clear_scheduled_bg_copies_to_vram
-	ldr r0, =sub_8170274
-	bl SetMainCallback2
-	ldr r0, =sub_8170260
-	bl SetVBlankCallback
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_81701C4
-
-	thumb_func_start sub_8170260
-sub_8170260: @ 8170260
-	push {lr}
-	bl LoadOam
-	bl ProcessSpriteCopyRequests
-	bl TransferPlttBuffer
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8170260
-
-	thumb_func_start sub_8170274
-sub_8170274: @ 8170274
-	push {lr}
-	bl sub_8170290
-	bl AnimateSprites
-	bl BuildOamBuffer
-	bl UpdatePaletteFade
-	bl do_scheduled_bg_tilemap_copies_to_vram
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8170274
-
 	thumb_func_start sub_8170290
 sub_8170290: @ 8170290
 	push {r4,r5,lr}

include/menu.h

@@ -28,5 +28,7 @@ bool8 free_temp_tile_data_buffers_if_possible(void);
 u64 sub_8198A50(struct WindowTemplate*, u8, u8, u8, u8, u8, u8, u16); // returns something but it isn't used, fix when menu.s is decomp'd
 void CreateYesNoMenu(const struct WindowTemplate *windowTemplate, u16 borderFirstTileNum, u8 borderPalette, u8 initialCursorPos);
 s8 sub_8198C58(void);
+void do_scheduled_bg_tilemap_copies_to_vram(void);
+void clear_scheduled_bg_copies_to_vram(void);
 
 #endif // GUARD_MENU_H

ld_script.txt

@@ -212,6 +212,7 @@ SECTIONS {
         asm/player_pc.o(.text);
         asm/intro.o(.text);
         src/reset_save_heap.o(.text);
+        src/field_region_map.o(.text);
         asm/field_region_map.o(.text);
         asm/battle_anim_8170478.o(.text);
         asm/hall_of_fame.o(.text);
@@ -433,6 +434,7 @@ SECTIONS {
         data/battle_controller_wally.o(.rodata);
         data/player_pc.o(.rodata);
         data/intro.o(.rodata);
+        src/field_region_map.o(.rodata);
         data/field_region_map.o(.rodata);
         data/battle_anim_8170478.o(.rodata);
         data/hall_of_fame.o(.rodata);

src/field_region_map.c

@@ -0,0 +1,84 @@
+
+// Includes
+#include "global.h"
+#include "main.h"
+#include "malloc.h"
+#include "gpu_regs.h"
+#include "bg.h"
+#include "text.h"
+#include "window.h"
+#include "text_window.h"
+#include "palette.h"
+#include "menu.h"
+
+// Static type declarations
+
+// Static RAM declarations
+
+EWRAM_DATA struct {
+    MainCallback callback;
+    u8 filler_004[0x888];
+    u16 unk_88c;
+} *gUnknown_0203BCD0 = NULL;
+
+// Static ROM declarations
+
+static void sub_81701C4(void);
+static void sub_8170260(void);
+static void sub_8170274(void);
+void sub_8170290(void);
+
+// .rodata
+
+extern const struct BgTemplate gUnknown_085E5068[];
+extern const struct WindowTemplate gUnknown_085E5070[];
+
+// .text
+
+void sub_817018C(MainCallback callback)
+{
+    SetVBlankCallback(NULL);
+    gUnknown_0203BCD0 = malloc(sizeof(*gUnknown_0203BCD0));
+    gUnknown_0203BCD0->unk_88c = 0;
+    gUnknown_0203BCD0->callback = callback;
+    SetMainCallback2(sub_81701C4);
+}
+
+static void sub_81701C4(void)
+{
+    SetGpuReg(REG_OFFSET_DISPCNT, 0);
+    SetGpuReg(REG_OFFSET_BG0HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG0VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG1HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG1VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG2HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG2VOFS, 0);
+    SetGpuReg(REG_OFFSET_BG3HOFS, 0);
+    SetGpuReg(REG_OFFSET_BG3VOFS, 0);
+    ResetSpriteData();
+    FreeAllSpritePalettes();
+    ResetBgsAndClearDma3BusyFlags(0);
+    InitBgsFromTemplates(1, gUnknown_085E5068, 2);
+    InitWindows(gUnknown_085E5070);
+    DeactivateAllTextPrinters();
+    sub_809882C(0, 0x27, 0xd0);
+    clear_scheduled_bg_copies_to_vram();
+    SetMainCallback2(sub_8170274);
+    SetVBlankCallback(sub_8170260);
+}
+
+static void sub_8170260(void)
+{
+    LoadOam();
+    ProcessSpriteCopyRequests();
+    TransferPlttBuffer();
+}
+
+static void sub_8170274(void)
+{
+    sub_8170290();
+    AnimateSprites();
+    BuildOamBuffer();
+    UpdatePaletteFade();
+    do_scheduled_bg_tilemap_copies_to_vram();
+}

sym_ewram.txt

@@ -1410,8 +1410,7 @@ gUnknown_0203BCC8: @ 203BCC8
 gUnknown_0203BCCC: @ 203BCCC
 	.space 0x4
 
-gUnknown_0203BCD0: @ 203BCD0
+	.include "src/field_region_map.o"
-	.space 0x4
 
 gUnknown_0203BCD4: @ 203BCD4
 	.space 0x4