1 /** @file
2 AsmEnableCache function
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php.
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 /**
16 Perform a WBINVD and clear both the CD and NW bits of CR0.
17
18 Enables the caches by executing a WBINVD instruction and then clear both the CD and NW
19 bits of CR0 to 0. This function is only available on IA-32 and x64.
20
21 **/
22 VOID
23 EFIAPI
AsmEnableCache(VOID)24 AsmEnableCache (
25 VOID
26 )
27 {
28 _asm {
29 wbinvd
30 mov eax, cr0
31 btr eax, 30
32 btr eax, 29
33 mov cr0, eax
34 }
35 }
36
37