diff options
| author | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-02 19:55:32 +0000 |
|---|---|---|
| committer | oliviermartin <oliviermartin@6f19259b-4bc3-4df7-8a09-765794883524> | 2012-05-02 19:55:32 +0000 |
| commit | b1d41be7c9c0dc18cf9b73785eee6a20f13db126 (patch) | |
| tree | 6cf436c0af3f6196985ef9680972a681337de484 /ArmPkg/Library/ArmLib/Common | |
| parent | f463bb00ad63cdfbec22519c9ae878f43760e97d (diff) | |
| download | edk2-platforms-b1d41be7c9c0dc18cf9b73785eee6a20f13db126.tar.xz | |
ArmPkg/ArmCpuLib: Replaced complex functions ArmCpuSynchronizeWait & ArmCpuSynchronizeSignal by sev & wfe
Previsouly the synchronization of MpCore was using the SGI (Software
Generated Interrupt) to synchronize MpCore during the early boot.
This commit replaced this mechanism by the more appropriate SEV/WFE
instructions (Send/Wait Event instructions).
That also eases the port to a new cpu/platform.
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13249 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'ArmPkg/Library/ArmLib/Common')
| -rw-r--r-- | ArmPkg/Library/ArmLib/Common/ArmLibSupport.S | 12 | ||||
| -rw-r--r-- | ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm | 10 |
2 files changed, 21 insertions, 1 deletions
diff --git a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S index d00a3623c5..da927b9d43 100644 --- a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S +++ b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.S @@ -1,7 +1,7 @@ #------------------------------------------------------------------------------
#
# Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
-# Copyright (c) 2011, ARM Limited. All rights reserved.
+# Copyright (c) 2011-2012, 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
@@ -40,6 +40,8 @@ GCC_ASM_EXPORT(ArmUpdateTranslationTableEntry) GCC_ASM_EXPORT(ArmWriteNsacr)
GCC_ASM_EXPORT(ArmWriteScr)
GCC_ASM_EXPORT(ArmWriteVMBar)
+GCC_ASM_EXPORT(ArmCallWFE)
+GCC_ASM_EXPORT(ArmCallSEV)
#------------------------------------------------------------------------------
@@ -146,4 +148,12 @@ ASM_PFX(ArmWriteVMBar): mcr p15, 0, r0, c12, c0, 1
bx lr
+ASM_PFX(ArmCallWFE):
+ wfe
+ bx lr
+
+ASM_PFX(ArmCallSEV):
+ sev
+ bx lr
+
ASM_FUNCTION_REMOVE_IF_UNREFERENCED
diff --git a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm index b892603518..186ee33dfa 100644 --- a/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm +++ b/ArmPkg/Library/ArmLib/Common/ArmLibSupport.asm @@ -40,6 +40,8 @@ EXPORT ArmWriteNsacr
EXPORT ArmWriteScr
EXPORT ArmWriteVMBar
+ EXPORT ArmCallWFE
+ EXPORT ArmCallSEV
AREA ArmLibSupport, CODE, READONLY
@@ -146,4 +148,12 @@ ArmWriteVMBar mcr p15, 0, r0, c12, c0, 1
bx lr
+ArmCallWFE
+ wfe
+ blx lr
+
+ArmCallSEV
+ sev
+ blx lr
+
END
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