diff --git a/libctru/include/3ds/svc.h b/libctru/include/3ds/svc.h
index 6e3ff60..0a023e2 100644
--- a/libctru/include/3ds/svc.h
+++ b/libctru/include/3ds/svc.h
@@ -34,6 +34,14 @@ typedef struct {
     u32 flags;
 } PageInfo;
 
+typedef enum {
+	ARBITER_FREE           =0,
+	ARBITER_ACQUIRE        =1,
+	ARBITER_KERNEL2        =2,
+	ARBITER_ACQUIRE_TIMEOUT=3,
+	ARBITER_KERNEL4        =4,
+} ArbitrationType;
+
 
 u32* getThreadCommandBuffer(void);
 
@@ -55,6 +63,8 @@ s32  svcClearTimer(Handle timer);
 s32  svcCreateMemoryBlock(Handle* memblock, u32 addr, u32 size, MemPerm my_perm, MemPerm other_perm);
 s32  svcMapMemoryBlock(Handle memblock, u32 addr, MemPerm my_perm, MemPerm other_perm);
 s32  svcUnmapMemoryBlock(Handle memblock, u32 addr);
+s32  svcCreateAddressArbiter(Handle *arbiter);
+s32  svcArbitrateAddress(Handle arbiter, u32 addr, ArbitrationType type, s32 value, s64 nanoseconds);
 s32  svcWaitSynchronization(Handle handle, s64 nanoseconds);
 s32  svcWaitSynchronizationN(s32* out, Handle* handles, s32 handles_num, bool wait_all, s64 nanoseconds);
 s32  svcCloseHandle(Handle handle);
diff --git a/libctru/source/svc.s b/libctru/source/svc.s
index 6dbdddd..f918369 100644
--- a/libctru/source/svc.s
+++ b/libctru/source/svc.s
@@ -153,6 +153,24 @@ svcUnmapMemoryBlock:
 	svc 0x20
 	bx lr
 
+.global svcCreateAddressArbiter
+.type svcCreateAddressArbiter, %function
+svcCreateAddressArbiter:
+	svc 0x21
+	bx lr
+
+.global svcArbitrateAddress
+.type svcArbitrateAddress, %function
+svcArbitrateAddress:
+	push {r4,r5}
+	add sp, #8
+	ldr r5, [sp]
+	ldr r4, [sp, #4]
+	sub sp, #8
+	svc 0x22
+	pop {r4,r5}
+	bx lr
+
 .global svcCloseHandle
 .type svcCloseHandle, %function
 svcCloseHandle: