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.Asm
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    SECTION .text
26
27;------------------------------------------------------------------------------
28; VOID
29; EFIAPI
30; AsmDisableCache (
31;   VOID
32;   );
33;------------------------------------------------------------------------------
34global ASM_PFX(AsmDisableCache)
35ASM_PFX(AsmDisableCache):
36    mov     eax, cr0
37    bts     eax, 30
38    btr     eax, 29
39    mov     cr0, eax
40    wbinvd
41    ret
42
43