Decompile unk_02022450.s

6 files changed, 53 insertions, 98 deletions

diff --git a/arm9/asm/unk_02022450.s b/arm9/asm/unk_02022450.s
deleted file mode 100644
index fd6aacb5..00000000
--- a/arm9/asm/unk_02022450.s
+++ /dev/null
@@ -1,94 +0,0 @@
-	.include "asm/macros.inc"
-	.include "global.inc"
-
-	.section .rodata
-
-	.global UNK_020EE6D4
-UNK_020EE6D4: ; 0x020EE6D4
-	.asciz "rom"
-
-	.text
-
-	thumb_func_start FUN_02022450
-FUN_02022450: ; 0x02022450
-	push {r3, lr}
-	bl FS_IsAvailable
-	cmp r0, #0x0
-	bne _02022460
-	bl OS_Terminate
-	pop {r3, pc}
-_02022460:
-	ldr r0, _020224BC ; =0x027FF00C
-	ldr r0, [r0, #0x0]
-	cmp r0, #0x0
-	bne _0202248A
-	bl CARD_Init
-	mov r2, #0x16
-	ldr r0, _020224C0 ; =0x027FFE00
-	ldr r1, _020224C4 ; =0x027FF000
-	lsl r2, r2, #0x4
-	bl MI_CpuCopy8
-	mov r2, #0x16
-	ldr r0, _020224C0 ; =0x027FFE00
-	ldr r1, _020224C8 ; =0x027FFA80
-	lsl r2, r2, #0x4
-	bl MI_CpuCopy8
-	ldr r1, _020224CC ; =0x4A414441
-	ldr r0, _020224BC ; =0x027FF00C
-	str r1, [r0, #0x0]
-_0202248A:
-	ldr r0, _020224D0 ; =UNK_020EE6D4
-	mov r1, #0x3
-	bl FS_FindArchive
-	ldr r1, _020224C4 ; =0x027FF000
-	ldr r2, [r1, #0x48]
-	str r2, [r0, #0x2c]
-	ldr r2, [r1, #0x4c]
-	str r2, [r0, #0x30]
-	ldr r2, [r1, #0x40]
-	str r2, [r0, #0x34]
-	ldr r2, [r1, #0x44]
-	str r2, [r0, #0x38]
-	ldr r2, [r1, #0xc]
-	ldr r0, _020224CC ; =0x4A414441
-	cmp r2, r0
-	bne _020224B4
-	ldrh r1, [r1, #0x10]
-	ldr r0, _020224D4 ; =0x00003130
-	cmp r1, r0
-	beq _020224B8
-_020224B4:
-	bl OS_Terminate
-_020224B8:
-	pop {r3, pc}
-	nop
-_020224BC: .word 0x027FF00C
-_020224C0: .word 0x027FFE00
-_020224C4: .word 0x027FF000
-_020224C8: .word 0x027FFA80
-_020224CC: .word 0x4A414441
-_020224D0: .word UNK_020EE6D4
-_020224D4: .word 0x00003130
-
-	thumb_func_start FUN_020224D8
-FUN_020224D8: ; 0x020224D8
-	push {r4, lr}
-	sub sp, #0x48
-	add r4, r0, #0x0
-	add r0, sp, #0x0
-	bl FS_InitFile
-	add r0, sp, #0x0
-	add r1, r4, #0x0
-	bl FS_OpenFile
-	cmp r0, #0x0
-	beq _020224FC
-	ldr r1, [sp, #0x24]
-	ldr r0, _02022500 ; =0x027FFC2C
-	str r1, [r0, #0x0]
-	mov r0, #0x0
-	bl OS_ResetSystem
-_020224FC:
-	add sp, #0x48
-	pop {r4, pc}
-	.balign 4
-_02022500: .word 0x027FFC2C
diff --git a/arm9/global.inc b/arm9/global.inc
index da12b3fd..53b4556c 100644
--- a/arm9/global.inc
+++ b/arm9/global.inc
@@ -1425,7 +1425,7 @@
 .extern FUN_02022318
 .extern FUN_020223BC
 .extern FUN_02022450
-.extern FUN_020224D8
+.extern Reset_To_File
 .extern FUN_02022504
 .extern GetStoragePCPointer
 .extern FUN_0202251C
diff --git a/arm9/modules/83/asm/module_83.s b/arm9/modules/83/asm/module_83.s
index d58de0be..06fa49b6 100644
--- a/arm9/modules/83/asm/module_83.s
+++ b/arm9/modules/83/asm/module_83.s
@@ -2334,7 +2334,7 @@ _0222E7F8:
 	pop {r3, pc}
 _0222E802:
 	ldr r0, _0222E840 ; =MOD83_0223A8C4
-	bl FUN_020224D8
+	bl Reset_To_File
 	pop {r3, pc}
 _0222E80A:
 	bl FUN_0200541C
diff --git a/arm9/src/game_init.c b/arm9/src/game_init.c
index 1c6098ea..020d4b75 100644
--- a/arm9/src/game_init.c
+++ b/arm9/src/game_init.c
@@ -7,6 +7,7 @@
 #include "MWC_string.h"
 #include "tp.h"
 #include "unk_0201B4E8.h"
+#include "unk_02022450.h"
 #include "game_init.h"
 #include "registers.h"
 #include "heap.h"
@@ -14,8 +15,6 @@
 
 #pragma thumb on
 
-extern void FUN_02022450(void);
-
 typedef volatile struct
 {
     u8 sys_and_irq_stack[0x3F80];
diff --git a/arm9/src/unk_02022450.c b/arm9/src/unk_02022450.c
new file mode 100644
index 00000000..2c69342c
--- /dev/null
+++ b/arm9/src/unk_02022450.c
@@ -0,0 +1,43 @@
+#include "global.h"
+#include "FS_file.h"
+#include "OS_terminate_proc.h"
+#include "CARD_rom.h"
+#include "MI_memory.h"
+
+#include "unk_02022450.h"
+
+static const char string_saying_rom[] = "rom";
+
+THUMB_FUNC void FUN_02022450 () {
+    if (!FS_IsAvailable()) {
+        OS_Terminate();
+    }
+    else {
+        if (!*(u32*)0x027FF00C) {
+            CARD_Init();
+            MI_CpuCopy8((u8*)0x027FFE00, (u8*)0x027FF000, 22 * 16);
+            MI_CpuCopy8((u8*)0x027FFE00, (u8*)0x027FFA80, 22 * 16);
+            *(u32*)0x027FF00C = 0x4A414441;
+        }
+        FSArchive * const r0 = FS_FindArchive(string_saying_rom, 3);
+        u32 *r1 = (u32*)0x027FF000;
+        r0->fat = r1[18];
+        r0->fat_size = r1[19];
+        r0->fnt = r1[16];
+        r0->fnt_size = r1[17];
+        if (*(u32*)0x027FF00C != 0x4A414441 || *(u16*)0x027FF010 != 0x3130) {
+            OS_Terminate();
+        }
+    }
+    return;
+}
+
+THUMB_FUNC void Reset_To_File (const char* path) {
+	FSFile file;
+	FS_InitFile(&file);
+	if (FS_OpenFile(&file, path)) {
+		*(u32*)HW_ROM_BASE_OFFSET_BUF = file.prop.file.top;
+		OS_ResetSystem(0);
+	}
+	return;
+}
diff --git a/include/unk_02022450.h b/include/unk_02022450.h
new file mode 100644
index 00000000..6228cc74
--- /dev/null
+++ b/include/unk_02022450.h
@@ -0,0 +1,7 @@
+#ifndef POKEDIAMOND_UNK_02022450_H
+#define POKEDIAMOND_UNK_02022450_H
+
+void FUN_02022450();
+void Reset_To_File(const char* path);
+
+#endif //POKEDIAMOND_UNK_02022450_H