through sub_800D550

asm/link_rfu.s

@@ -5,63 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_800D52C
-sub_800D52C: @ 800D52C
-	push {lr}
-	ldr r1, =gUnknown_03004140
-	str r0, [r1, 0x44]
-	ldr r0, =sub_800CEB0
-	bl rfu_setMSCCallback
-	pop {r0}
-	bx r0
-	.pool
-	thumb_func_end sub_800D52C
-
-	thumb_func_start sub_800D544
-sub_800D544: @ 800D544
-	ldr r1, =gUnknown_03004140
-	str r0, [r1, 0x40]
-	bx lr
-	.pool
-	thumb_func_end sub_800D544
-
-	thumb_func_start sub_800D550
-sub_800D550: @ 800D550
-	push {r4,r5,lr}
-	lsls r0, 24
-	lsrs r4, r0, 24
-	lsls r1, 16
-	lsrs r5, r1, 16
-	ldr r0, =gUnknown_03004140
-	ldrb r1, [r0, 0x9]
-	adds r3, r0, 0
-	cmp r1, 0
-	beq _0800D578
-	cmp r4, 0
-	bne _0800D578
-	adds r0, 0x30
-	ldrb r0, [r0]
-	cmp r0, 0
-	beq _0800D578
-	movs r0, 0x5
-	b _0800D588
-	.pool
-_0800D578:
-	ldr r2, =0x04000208
-	ldrh r1, [r2]
-	movs r0, 0
-	strh r0, [r2]
-	strb r4, [r3, 0x9]
-	strh r5, [r3, 0x32]
-	strh r1, [r2]
-	movs r0, 0
-_0800D588:
-	pop {r4,r5}
-	pop {r1}
-	bx r1
-	.pool
-	thumb_func_end sub_800D550
-
 	thumb_func_start sub_800D594
 sub_800D594: @ 800D594
 	push {lr}

src/link_rfu.c

@@ -26,7 +26,7 @@ EWRAM_DATA struct UnkLinkRfuStruct_02022B2C gUnknown_02022B2C = {};
 static void sub_800C000(void);
 static void sub_800C7B4(u16 r8, u16 r6);
 static void sub_800C744(u32 a0);
-void sub_800CEB0(u16 r6);
+static void sub_800CEB0(u16 r6);
 static void sub_800CF34(void);
 static void sub_800D158(void);
 static void sub_800D20C(void);
@@ -977,7 +977,7 @@ static void sub_800C7B4(u16 r8, u16 r6)
     }
 }
 
-void sub_800CEB0(u16 r6)
+static void sub_800CEB0(u16 r6)
 {
     u8 r7;
     u8 sp0;
@@ -1305,3 +1305,29 @@ static void sub_800D434(void)
         }
     }
 }
+
+void sub_800D52C(void (*func)(u16))
+{
+    gUnknown_03004140.unk_44 = func;
+    rfu_setMSCCallback(sub_800CEB0);
+}
+
+void sub_800D544(void (*func)(u8, u8))
+{
+    gUnknown_03004140.unk_40 = func;
+}
+
+u8 sub_800D550(u8 a0, u16 a1)
+{
+    u16 imeBak;
+    if (gUnknown_03004140.unk_09 && a0 == 0 && gUnknown_03004140.unk_30)
+    {
+        return 5;
+    }
+    imeBak = REG_IME;
+    REG_IME = 0;
+    gUnknown_03004140.unk_09 = a0;
+    gUnknown_03004140.unk_32 = a1;
+    REG_IME = imeBak;
+    return 0;
+}