From a054b244ab150b3823aa513cc215c81dc426c796 Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Fri, 17 Nov 2017 08:33:25 -0500
Subject: [PATCH] sub_800BF4C

---
 asm/link.s         | 36 ------------------------------------
 include/librfu.h   |  2 ++
 include/link_rfu.h |  3 +++
 src/link.c         | 17 +++++++++++++++++
 4 files changed, 22 insertions(+), 36 deletions(-)

diff --git a/asm/link.s b/asm/link.s
index 5abaef5b16..93005de351 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -7,42 +7,6 @@
 
 // RFU; bss indicates that no file boundary exists here
 
-	thumb_func_start sub_800BF4C
-sub_800BF4C: @ 800BF4C
-	push {r4-r6,lr}
-	sub sp, 0x4
-	adds r5, r0, 0
-	adds r6, r1, 0
-	cmp r5, 0
-	beq _0800BF94
-	mov r1, sp
-	movs r0, 0
-	strh r0, [r1]
-	ldr r4, =gUnknown_03004140
-	ldr r2, =0x01000024
-	mov r0, sp
-	adds r1, r4, 0
-	bl CpuSet
-	movs r0, 0xFF
-	strb r0, [r4, 0x6]
-	str r5, [r4, 0x40]
-	str r6, [r4, 0x44]
-	ldr r0, =sub_800CEB0
-	bl rfu_setMSCCallback
-	ldr r0, =sub_800C7B4
-	bl rfu_setREQCallback
-	movs r0, 0
-	b _0800BF96
-	.pool
-_0800BF94:
-	movs r0, 0x4
-_0800BF96:
-	add sp, 0x4
-	pop {r4-r6}
-	pop {r1}
-	bx r1
-	thumb_func_end sub_800BF4C
-
 	thumb_func_start sub_800BFA0
 sub_800BFA0: @ 800BFA0
 	push {r4,lr}
diff --git a/include/librfu.h b/include/librfu.h
index 4e3c82ac37..9b82de0b76 100644
--- a/include/librfu.h
+++ b/include/librfu.h
@@ -147,3 +147,5 @@ void rfu_REQ_stopMode(void);
 void rfu_waitREQComplete(void);
 u32 rfu_REQBN_softReset_and_checkID(void);
 void rfu_REQ_sendData(u8);
+void rfu_setMSCCallback(void (*func)(u16));
+void rfu_setREQCallback(void (*func)(u16, u16));
diff --git a/include/link_rfu.h b/include/link_rfu.h
index 8929973d85..24bddbe570 100644
--- a/include/link_rfu.h
+++ b/include/link_rfu.h
@@ -15,6 +15,9 @@ struct UnkRfuStruct_1 {
     u8 unk_08;
     u8 filler_09[4];
     u8 unk_0d;
+    u8 filler_0e[0x32];
+    void (*unk_40)(u8);
+    void (*unk_44)(void);
 };
 
 // Exported RAM declarations
diff --git a/src/link.c b/src/link.c
index fc9e14b682..963ef603ea 100644
--- a/src/link.c
+++ b/src/link.c
@@ -170,6 +170,8 @@ static void StopTimer(void);
 static void SendRecvDone(void);
 
 void sub_800D610(void);
+void sub_800CEB0(u16 unk0);
+void sub_800C7B4(u16 unk0, u16 unk1);
 
 // .rodata
 
@@ -2485,3 +2487,18 @@ void rfu_REQ_sendData_wrapper(u8 r2)
     }
     rfu_REQ_sendData(r2);
 }
+
+int sub_800BF4C(void (*func1)(u8), void (*func2)(void))
+{
+    if (func1 == NULL)
+    {
+        return 4;
+    }
+    CpuFill16(0, &gUnknown_03004140, sizeof(gUnknown_03004140));
+    gUnknown_03004140.unk_06 = -1;
+    gUnknown_03004140.unk_40 = func1;
+    gUnknown_03004140.unk_44 = func2;
+    rfu_setMSCCallback(sub_800CEB0);
+    rfu_setREQCallback(sub_800C7B4);
+    return 0;
+}