summaryrefslogtreecommitdiff
path: root/UnixPkg/Library/UnixBaseLib/X64/EnableCache.asm
blob: 88b71d706f72a6e43c92294fe82177c359076561 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
;------------------------------------------------------------------------------
;
; 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.
;
; Module Name:
;
;   EnableCache.Asm
;
; Abstract:
;
;  Flush all caches with a WBINVD instruction, clear the CD bit of CR0 to 0, and clear 
;  the NW bit of CR0 to 0
;
; Notes:
;
;------------------------------------------------------------------------------

    .code

;------------------------------------------------------------------------------
; VOID
; EFIAPI
; AsmEnableCache (
;   VOID
;   );
;------------------------------------------------------------------------------
AsmEnableCache PROC
    wbinvd
    mov     rax, cr0
    btr     rax, 29
    btr     rax, 30
    mov     cr0, rax
    ret
AsmEnableCache ENDP

    END