diff options
| author | mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-11-24 08:30:58 +0000 |
|---|---|---|
| committer | mdkinney <mdkinney@6f19259b-4bc3-4df7-8a09-765794883524> | 2008-11-24 08:30:58 +0000 |
| commit | 9f4f2f0e15252004e06ca246300a2fe21b8bf0ae (patch) | |
| tree | 3c018c475b91d09f68c9409f34def10d27bf73ad /MdePkg/Library/BaseLib/Ia32/EnableCache.S | |
| parent | 298f0688f7b28b6f2cc3d65ddf608f2f2cdbf3d5 (diff) | |
| download | edk2-platforms-9f4f2f0e15252004e06ca246300a2fe21b8bf0ae.tar.xz | |
Add EnableCache() and DisableCache() implementations for IA32 and X64 to the BaseLib
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6705 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/Ia32/EnableCache.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/EnableCache.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/EnableCache.S b/MdePkg/Library/BaseLib/Ia32/EnableCache.S new file mode 100644 index 0000000000..bdb4bdbdb3 --- /dev/null +++ b/MdePkg/Library/BaseLib/Ia32/EnableCache.S @@ -0,0 +1,39 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation
+# 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.
+#
+# Module Name:
+#
+# EnableCache.S
+#
+# Abstract:
+#
+# Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear
+# the NW bit of CR0 to 0
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+#------------------------------------------------------------------------------
+# VOID
+# EFIAPI
+# AsmEnableCache (
+# VOID
+# );
+#------------------------------------------------------------------------------
+.globl ASM_PFX(AsmEnableCache)
+ASM_PFX(AsmEnableCache):
+ wbinvd
+ movl %cr0, %eax
+ btrl $30, %eax
+ btrl $29, %eax
+ movl %eax, %cr0
+ ret
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