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/X64/DisableCache.asm | |
| 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/X64/DisableCache.asm')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/DisableCache.asm | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/DisableCache.asm b/MdePkg/Library/BaseLib/X64/DisableCache.asm new file mode 100644 index 0000000000..5ad85c7697 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/DisableCache.asm @@ -0,0 +1,43 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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:
+;
+; DisableCache.Asm
+;
+; Abstract:
+;
+; Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
+; WBINVD instruction.
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; AsmDisableCache (
+; VOID
+; );
+;------------------------------------------------------------------------------
+AsmDisableCache PROC
+ mov rax, cr0
+ bts rax, 30
+ btr rax, 29
+ mov cr0, rax
+ wbinvd
+ ret
+AsmDisableCache ENDP
+
+ END
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