1#------------------------------------------------------------------------------
2#
3# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4# This program and the accompanying materials
5# are licensed and made available under the terms and conditions of the BSD License
6# which accompanies this distribution.  The full text of the license may be found at
7# http://opensource.org/licenses/bsd-license.php.
8#
9# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
11#
12# Module Name:
13#
14#   DisableCache.S
15#
16# Abstract:
17#
18#   Set the CD bit of CR0 to 1, clear the NW bit of CR0 to 0, and flush all caches with a
19#   WBINVD instruction.
20#
21# Notes:
22#
23#------------------------------------------------------------------------------
24
25#------------------------------------------------------------------------------
26# VOID
27# EFIAPI
28# AsmDisableCache (
29#   VOID
30#   );
31#------------------------------------------------------------------------------
32ASM_GLOBAL ASM_PFX(AsmDisableCache)
33ASM_PFX(AsmDisableCache):
34    movl    %cr0, %eax
35    btsl    $30, %eax
36    btrl    $29, %eax
37    movl    %eax, %cr0
38    wbinvd
39    ret
40