/** @file | |
AsmDisableCache function | |
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
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. | |
**/ | |
/** | |
Set CD bit and clear NW bit of CR0 followed by a WBINVD. | |
Disables the caches by setting the CD bit of CR0 to 1, clearing the NW bit of CR0 to 0, | |
and executing a WBINVD instruction. This function is only available on IA-32 and x64. | |
**/ | |
VOID | |
EFIAPI | |
AsmDisableCache ( | |
VOID | |
) | |
{ | |
_asm { | |
mov eax, cr0 | |
bts eax, 30 | |
btr eax, 29 | |
mov cr0, eax | |
wbinvd | |
} | |
} | |