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/DisableCache.c | |
| 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/DisableCache.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/Ia32/DisableCache.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/DisableCache.c b/MdePkg/Library/BaseLib/Ia32/DisableCache.c new file mode 100644 index 0000000000..d2d028a93d --- /dev/null +++ b/MdePkg/Library/BaseLib/Ia32/DisableCache.c @@ -0,0 +1,36 @@ +/** @file
+ AsmDisableCache function
+
+ Copyright (c) 2006 - 2008, Intel Corporation<BR>
+ 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.
+
+**/
+
+/**
+ Disables caches.
+
+ Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
+ WBINVD instruction.
+
+**/
+VOID
+EFIAPI
+AsmDisableCache (
+ VOID
+ )
+{
+ _asm {
+ mov eax, cr0
+ bts eax, 30
+ btr eax, 29
+ mov cr0, eax
+ wbinvd
+ }
+}
+
|