diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsl.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsl.S
new file mode 100644
index 0000000000..ba8ab1cf58
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsl.S
@@ -0,0 +1,40 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2013, ARM. All rights reserved.
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+
+.text
+.align 2
+GCC_ASM_EXPORT(__aeabi_llsl)
+
+#
+#VOID
+#EFIAPI
+#__aeabi_llsl (
+# IN VOID *Destination,
+# IN VOID *Source,
+# IN UINT32 Size
+# );
+#
+ASM_PFX(__aeabi_llsl):
+ subs r3,r2,#0x20
+ bpl 1f
+ rsb r3,r2,#0x20
+ lsl r1,r1,r2
+ orr r1,r1,r0,lsr r3
+ lsl r0,r0,r2
+ bx lr
+1:
+ lsl r1,r0,r3
+ mov r0,#0
+ bx lr
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.S b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.S
new file mode 100644
index 0000000000..3d2c106270
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/Arm/llsr.S
@@ -0,0 +1,40 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2013, ARM. All rights reserved.
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#------------------------------------------------------------------------------
+
+
+.text
+.align 2
+GCC_ASM_EXPORT(__aeabi_llsr)
+
+#
+#VOID
+#EFIAPI
+#__aeabi_llsr (
+# IN VOID *Destination,
+# IN VOID *Source,
+# IN UINT32 Size
+# );
+#
+ASM_PFX(__aeabi_llsr):
+ subs r3,r2,#0x20
+ bpl 1f
+ rsb r3,r2,#0x20
+ lsr r0,r0,r2
+ orr r0,r0,r1,lsl r3
+ lsr r1,r1,r2
+ bx lr
+1:
+ lsr r0,r1,r3
+ mov r1,#0
+ bx lr
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
index e6e728af65..53b1b15c77 100644
--- a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
@@ -2,7 +2,7 @@
# Base Library implementation.
#
# Copyright (c) 2009, Apple Inc. All rights reserved.
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2013, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
@@ -95,6 +95,10 @@
Arm/uldiv.S | GCC
Arm/ldivmod.S | GCC
+ Arm/llsr.S | GCC
+ Arm/llsl.S | GCC
+
+
[Packages]
MdePkg/MdePkg.dec