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| author | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-07-20 17:47:44 +0000 |
|---|---|---|
| committer | andrewfish <andrewfish@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-07-20 17:47:44 +0000 |
| commit | f7c8bd9f9d22d3124ef30737dae2fbe49fdacd41 (patch) | |
| tree | b299a4f58a1b67e6993c9812fa085cd56d77d95b /MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S | |
| parent | 2d08d17d651d81d267f00dcfdff0a46013b49907 (diff) | |
| download | edk2-f7c8bd9f9d22d3124ef30737dae2fbe49fdacd41.tar.gz edk2-f7c8bd9f9d22d3124ef30737dae2fbe49fdacd41.tar.bz2 edk2-f7c8bd9f9d22d3124ef30737dae2fbe49fdacd41.zip | |
MdePkg: Update CpuSleep to use ARMv7 instruction.
The code was using ARMv6 co-processor reg, that is a no-op on ARMv7. WFI is the instruction on ARMv7.
signed-off-by: andrewfish
reviewed-by: mdkinney
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12035 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S')
| -rw-r--r-- | MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S b/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S index 44160d4c32..2c859306db 100644 --- a/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S +++ b/MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S @@ -1,6 +1,12 @@ #------------------------------------------------------------------------------
#
-# CpuSleep() for ARM
+# 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>
@@ -33,6 +39,5 @@ GCC_ASM_EXPORT(CpuSleep) # );
#
ASM_PFX(CpuSleep):
- mov r0,#0
- mcr p15,0,r0,c7,c0,4 // Wait for Interrupt instruction
+ wfi
bx lr
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