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
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mdkinney
2008-11-24 08:30:58 +00:00
parent 298f0688f7
commit 9f4f2f0e15
11 changed files with 414 additions and 0 deletions

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/** @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
}
}