From f25cdb483795454d0d89d59fd614697e6c4b8cc4 Mon Sep 17 00:00:00 2001
From: PikalaxALT <pikalaxalt@gmail.com>
Date: Sat, 18 Nov 2017 15:15:54 -0500
Subject: [PATCH] resolve questionable file boundary decision

---
 asm/link.s     |   2 -
 ld_script.txt  |   1 +
 src/link.c     | 169 ------------------------------------------------
 src/link_rfu.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 171 insertions(+), 172 deletions(-)

diff --git a/asm/link.s b/asm/link.s
index cff75670e..dba40d2a9 100644
--- a/asm/link.s
+++ b/asm/link.s
@@ -5,8 +5,6 @@
 
 	.text
 
-// RFU; bss indicates that no file boundary exists here
-
 	thumb_func_start sub_800C12C
 sub_800C12C: @ 800C12C
 	push {r4-r7,lr}
diff --git a/ld_script.txt b/ld_script.txt
index 17a6fd8e4..a4ce5e236 100644
--- a/ld_script.txt
+++ b/ld_script.txt
@@ -52,6 +52,7 @@ SECTIONS {
         src/sprite.o(.text);
         src/string_util.o(.text);
         src/link.o(.text);
+        src/link_rfu.o(.text);
         asm/link.o(.text);
         asm/link_rfu.o(.text);
         asm/rom_8011DC0.o(.text);
diff --git a/src/link.c b/src/link.c
index 9fae98454..8c6dda32a 100644
--- a/src/link.c
+++ b/src/link.c
@@ -66,7 +66,6 @@ IWRAM_DATA u16 sSendNonzeroCheck;
 IWRAM_DATA u16 sRecvNonzeroCheck;
 IWRAM_DATA u8 sChecksumAvailable;
 IWRAM_DATA u8 sHandshakePlayerCount;
-IWRAM_DATA u8 gUnknown_03000D74;
 
 u16 gLinkPartnersHeldKeys[6];
 u32 gLinkDebugSeed;
@@ -169,13 +168,6 @@ static void DoSend(void);
 static void StopTimer(void);
 static void SendRecvDone(void);
 
-void sub_800D610(void);
-void sub_800CEB0(u16 unk0);
-void sub_800C7B4(u16 unk0, u16 unk1);
-void sub_800C000(void);
-
-void sub_800D30C(u8 a0, u8 a1);
-
 // .rodata
 
 ALIGNED(4) const u16 gWirelessLinkDisplayPal[] = INCBIN_U16("graphics/interface/wireless_link_display.gbapal");
@@ -2448,164 +2440,3 @@ void ResetRecvBuffer(void)
 }
 
 // rfu
-
-u32 sub_800BEC0(void)
-{
-    u32 r4;
-
-    r4 = rfu_REQBN_softReset_and_checkID();
-    if (r4 == 0x8001)
-    {
-        gUnknown_03004140.unk_08 = 1;
-    }
-    if (gUnknown_03004140.unk_04 != 0x17 && gUnknown_03004140.unk_04 != 0x01)
-    {
-        gUnknown_03004140.unk_05 = 0;
-        gUnknown_03004140.unk_04 = 0;
-    }
-    gUnknown_03004140.unk_07 = 0;
-    gUnknown_03004140.unk_0d = 0;
-    gUnknown_03004140.unk_01 = 0;
-    gUnknown_03004140.unk_00 = 0;
-    gUnknown_03004140.unk_06 = -1;
-    sub_800D610();
-    return r4;
-}
-
-void rfu_REQ_sendData_wrapper(u8 r2)
-{
-    u8 val;
-    if (!gUnknown_03007890->unk_00)
-    {
-        val = gUnknown_03004140.unk_02;
-        r2 = 0;
-        if (val == 1)
-        {
-            r2 = 1;
-        }
-    }
-    else
-    {
-        gUnknown_03004140.unk_03 = 0;
-    }
-    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;
-}
-
-void sub_800BFA0(void)
-{
-    CpuFill16(0, &gUnknown_03004140, sizeof(gUnknown_03004140) - 2 * sizeof(void *));
-    gUnknown_03004140.unk_06 = -1;
-}
-
-void sub_800BFCC(struct UnkLinkRfuStruct_02022B2C *unk0)
-{
-    sub_800C000();
-    gUnknown_03004140.unk_04 = 1;
-    gUnknown_03004140.unk_05 = 2;
-    gUnknown_03004140.unk_3c = unk0;
-    gUnknown_03004140.unk_09 = unk0->unk_11;
-    gUnknown_03004140.unk_32 = unk0->unk_12;
-    gUnknown_03004140.unk_18 = unk0->unk_14;
-    if (unk0->unk_10)
-    {
-        gUnknown_03004140.unk_0b = 1;
-    }
-}
-
-void sub_800C000(void)
-{
-    u8 i;
-
-    gUnknown_03004140.unk_05 = 0;
-    gUnknown_03004140.unk_04 = 0;
-    gUnknown_03004140.unk_06 = -1;
-    gUnknown_03004140.unk_07 = 0;
-    gUnknown_03004140.unk_10 = 0;
-    gUnknown_03004140.unk_0c = 0;
-    gUnknown_03004140.unk_24 = 0;
-    gUnknown_03004140.unk_30 = 0;
-    for (i = 0; i < 4; i++)
-    {
-        gUnknown_03004140.unk_28[i] = 0;
-        gUnknown_03004140.unk_34[i] = 0;
-    }
-}
-
-void sub_800C048(void)
-{
-    gUnknown_03004140.unk_04 = 0x15;
-}
-
-u8 sub_800C054(u8 r5, u16 r7, u16 r8, u16 *r6)
-{
-    u8 i;
-    u16 *buffer;
-
-    if (gUnknown_03004140.unk_04 != 0 && (gUnknown_03004140.unk_04 != 0x08 || r5 != 1))
-    {
-        gUnknown_03004140.unk_14 = 1;
-        sub_800D30C(0xf3, 0x01);
-        return 1;
-    }
-    if (!rfu_getMasterSlave())
-    {
-        gUnknown_03004140.unk_14 = 2;
-        sub_800D30C(0xf3, 0x01);
-        return 2;
-    }
-    for (i = 0, buffer = r6; i < 16; i++)
-    {
-        if (*buffer++ == 0xFFFF)
-        {
-            break;
-        }
-    }
-    if (i == 16)
-    {
-        gUnknown_03004140.unk_14 = 4;
-        sub_800D30C(0xf3, 0x01);
-        return 4;
-    }
-    if (r5 > 1)
-    {
-        gUnknown_03004140.unk_07 = 1;
-        r5 = 1;
-        r7 = 0;
-    }
-    else
-    {
-        gUnknown_03004140.unk_07 = 0;
-    }
-    if (r5 != 0)
-    {
-        gUnknown_03004140.unk_04 = 5;
-    }
-    else
-    {
-        gUnknown_03004140.unk_04 = 9;
-        if (gUnknown_03004140.unk_0b)
-        {
-            gUnknown_03004140.unk_0b = 2;
-        }
-    }
-    gUnknown_03004140.unk_06 = r5;
-    gUnknown_03004140.unk_1a = r7;
-    gUnknown_03004140.unk_26 = r8;
-    gUnknown_03004140.unk_20 = r6;
-    return 0;
-}
diff --git a/src/link_rfu.c b/src/link_rfu.c
index f654b9430..7f4a3695b 100644
--- a/src/link_rfu.c
+++ b/src/link_rfu.c
@@ -2,6 +2,7 @@
 // Includes
 #include "global.h"
 #include "link.h"
+#include "librfu.h"
 #include "link_rfu.h"
 
 // Static type declarations
@@ -9,12 +10,180 @@
 struct UnkRfuStruct_1 gUnknown_03004140;
 
 // Static RAM declarations
-IWRAM_DATA u8 gUnknown_03000D78[8];
+IWRAM_DATA u8 gUnknown_03000D74;
+ALIGNED(4) IWRAM_DATA u8 gUnknown_03000D78[8];
 IWRAM_DATA u8 gUnknown_03000D80[16];
 IWRAM_DATA u16 gUnknown_03000D90[8];
 
 // Static ROM declarations
 
+void sub_800C000(void);
+void sub_800CEB0(u16 unk0);
+void sub_800C7B4(u16 unk0, u16 unk1);
+void sub_800D30C(u8 a0, u8 a1);
+void sub_800D610(void);
+
 // .rodata
 
 // .text
+
+u32 sub_800BEC0(void)
+{
+    u32 r4;
+
+    r4 = rfu_REQBN_softReset_and_checkID();
+    if (r4 == 0x8001)
+    {
+        gUnknown_03004140.unk_08 = 1;
+    }
+    if (gUnknown_03004140.unk_04 != 0x17 && gUnknown_03004140.unk_04 != 0x01)
+    {
+        gUnknown_03004140.unk_05 = 0;
+        gUnknown_03004140.unk_04 = 0;
+    }
+    gUnknown_03004140.unk_07 = 0;
+    gUnknown_03004140.unk_0d = 0;
+    gUnknown_03004140.unk_01 = 0;
+    gUnknown_03004140.unk_00 = 0;
+    gUnknown_03004140.unk_06 = -1;
+    sub_800D610();
+    return r4;
+}
+
+void rfu_REQ_sendData_wrapper(u8 r2)
+{
+    u8 val;
+    if (!gUnknown_03007890->unk_00)
+    {
+        val = gUnknown_03004140.unk_02;
+        r2 = 0;
+        if (val == 1)
+        {
+            r2 = 1;
+        }
+    }
+    else
+    {
+        gUnknown_03004140.unk_03 = 0;
+    }
+    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;
+}
+
+void sub_800BFA0(void)
+{
+    CpuFill16(0, &gUnknown_03004140, sizeof(gUnknown_03004140) - 2 * sizeof(void *));
+    gUnknown_03004140.unk_06 = -1;
+}
+
+void sub_800BFCC(struct UnkLinkRfuStruct_02022B2C *unk0)
+{
+    sub_800C000();
+    gUnknown_03004140.unk_04 = 1;
+    gUnknown_03004140.unk_05 = 2;
+    gUnknown_03004140.unk_3c = unk0;
+    gUnknown_03004140.unk_09 = unk0->unk_11;
+    gUnknown_03004140.unk_32 = unk0->unk_12;
+    gUnknown_03004140.unk_18 = unk0->unk_14;
+    if (unk0->unk_10)
+    {
+        gUnknown_03004140.unk_0b = 1;
+    }
+}
+
+void sub_800C000(void)
+{
+    u8 i;
+
+    gUnknown_03004140.unk_05 = 0;
+    gUnknown_03004140.unk_04 = 0;
+    gUnknown_03004140.unk_06 = -1;
+    gUnknown_03004140.unk_07 = 0;
+    gUnknown_03004140.unk_10 = 0;
+    gUnknown_03004140.unk_0c = 0;
+    gUnknown_03004140.unk_24 = 0;
+    gUnknown_03004140.unk_30 = 0;
+    for (i = 0; i < 4; i++)
+    {
+        gUnknown_03004140.unk_28[i] = 0;
+        gUnknown_03004140.unk_34[i] = 0;
+    }
+}
+
+void sub_800C048(void)
+{
+    gUnknown_03004140.unk_04 = 0x15;
+}
+
+u8 sub_800C054(u8 r5, u16 r7, u16 r8, u16 *r6)
+{
+    u8 i;
+    u16 *buffer;
+
+    if (gUnknown_03004140.unk_04 != 0 && (gUnknown_03004140.unk_04 != 0x08 || r5 != 1))
+    {
+        gUnknown_03004140.unk_14 = 1;
+        sub_800D30C(0xf3, 0x01);
+        return 1;
+    }
+    if (!rfu_getMasterSlave())
+    {
+        gUnknown_03004140.unk_14 = 2;
+        sub_800D30C(0xf3, 0x01);
+        return 2;
+    }
+    for (i = 0, buffer = r6; i < 16; i++)
+    {
+        if (*buffer++ == 0xFFFF)
+        {
+            break;
+        }
+    }
+    if (i == 16)
+    {
+        gUnknown_03004140.unk_14 = 4;
+        sub_800D30C(0xf3, 0x01);
+        return 4;
+    }
+    if (r5 > 1)
+    {
+        gUnknown_03004140.unk_07 = 1;
+        r5 = 1;
+        r7 = 0;
+    }
+    else
+    {
+        gUnknown_03004140.unk_07 = 0;
+    }
+    if (r5 != 0)
+    {
+        gUnknown_03004140.unk_04 = 5;
+    }
+    else
+    {
+        gUnknown_03004140.unk_04 = 9;
+        if (gUnknown_03004140.unk_0b)
+        {
+            gUnknown_03004140.unk_0b = 2;
+        }
+    }
+    gUnknown_03004140.unk_06 = r5;
+    gUnknown_03004140.unk_1a = r7;
+    gUnknown_03004140.unk_26 = r8;
+    gUnknown_03004140.unk_20 = r6;
+    return 0;
+}