1 files changed, 43 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S b/Core/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S
new file mode 100644
index 0000000000..2c859306db
--- /dev/null
+++ b/Core/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S
@@ -0,0 +1,43 @@
+#------------------------------------------------------------------------------ 
+#
+# CpuSleep() for ARMv7
+#
+# ARMv6 versions was:
+#    MOV r0,#0
+#    MCR p15,0,r0,c7,c0,4   ;Wait for Interrupt instruction
+#
+# But this is a no-op on ARMv7
+#
+# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+# Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+# 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
+.p2align 2
+GCC_ASM_EXPORT(CpuSleep)
+
+#/**
+#  Places the CPU in a sleep state until an interrupt is received.
+#
+#  Places the CPU in a sleep state until an interrupt is received. If interrupts
+#  are disabled prior to calling this function, then the CPU will be placed in a
+#  sleep state indefinitely.
+#
+#**/
+#VOID
+#EFIAPI
+#CpuSleep (
+#  VOID
+#  );
+#
+ASM_PFX(CpuSleep):
+    wfi
+    bx  lr