3 files changed, 26 insertions, 3 deletions
diff --git a/include/asm.inc.h b/include/asm.inc.h
index 5e2b49a84..5ec19b81e 100644
--- a/include/asm.inc.h
+++ b/include/asm.inc.h
@@ -443,9 +443,9 @@ void sub_813CAF4(u8);
 void intro_reset_and_hide_bgs(void);
 void sub_813CCE8(u8);
 void sub_813CE30(u16, u16, u16, u16);
-u8 sub_813CE88(/*TODO: arg types*/);
-u8 sub_813CFA8(/*TODO: arg types*/);
-void sub_813D084(/*TODO: arg types*/);
+u8 sub_813CE88(u16, s16, u16, u16, u8);
+u8 sub_813CFA8(u16, u16, u16, u16);
+void sub_813D084(u8);
 u8 sub_813D584(/*TODO: arg types*/);
 void sub_813D788(struct Sprite *);
 void sub_813D880(struct Sprite *);
diff --git a/include/gba/syscall.h b/include/gba/syscall.h
index 9576f7e99..e47f964d1 100644
--- a/include/gba/syscall.h
+++ b/include/gba/syscall.h
@@ -31,6 +31,8 @@ void CpuSet(const void *src, void *dest, u32 control);
 
 void CpuFastSet(const void *src, void *dest, u32 control);
 
+void BgAffineSet(struct BgAffineSrcData *src, struct BgAffineDstData *dest, s32 count);
+
 void ObjAffineSet(struct ObjAffineSrcData *src, void *dest, s32 count, s32 offset);
 
 void LZ77UnCompWram(const void *src, void *dest);
diff --git a/include/gba/types.h b/include/gba/types.h
index be7390d5a..fd8a20a4c 100644
--- a/include/gba/types.h
+++ b/include/gba/types.h
@@ -74,6 +74,27 @@ struct OamData
 #define ST_OAM_H_RECTANGLE 1
 #define ST_OAM_V_RECTANGLE 2
 
+struct BgAffineSrcData
+{
+    s32 texX;
+    s32 texY;
+    s16 scrX;
+    s16 scrY;
+    s16 sx;
+    s16 sy;
+    u16 alpha;
+};
+
+struct BgAffineDstData
+{
+    s16 pa;
+    s16 pb;
+    s16 pc;
+    s16 pd;
+    s32 dx;
+    s32 dy;
+};
+
 struct ObjAffineSrcData
 {
     s16 xScale;