a64f96bf7e5b75fdcd7f7b58009b39049241231b
[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / FlushCacheLine.asm
1 ;------------------------------------------------------------------------------
2 ;
3 ; Copyright (c) 2006 - 2015, 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 ; FlushCacheLine.Asm
15 ;
16 ; Abstract:
17 ;
18 ; AsmFlushCacheLine function
19 ;
20 ; Notes:
21 ;
22 ;------------------------------------------------------------------------------
23
24 .586P
25 .model flat,C
26 .xmm
27 .code
28
29 ;------------------------------------------------------------------------------
30 ; VOID *
31 ; EFIAPI
32 ; AsmFlushCacheLine (
33 ; IN VOID *LinearAddress
34 ; );
35 ;------------------------------------------------------------------------------
36 AsmFlushCacheLine PROC
37 ;
38 ; If the CPU does not support CLFLUSH instruction,
39 ; then promote flush range to flush entire cache.
40 ;
41 mov eax, 1
42 cpuid
43 mov eax, [esp + 4]
44 test edx, BIT19
45 jz @F
46 clflush [eax]
47 ret
48 @@:
49 wbinvd
50 ret
51 AsmFlushCacheLine ENDP
52
53 END