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[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / EnableCache.c
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9f4f2f0e 1/** @file\r
2 AsmEnableCache function\r
3\r
bb817c56
HT
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
5 This program and the accompanying materials\r
9f4f2f0e 6 are licensed and made available under the terms and conditions of the BSD License\r
7 which accompanies this distribution. The full text of the license may be found at\r
35a17154 8 http://opensource.org/licenses/bsd-license.php.\r
9f4f2f0e 9\r
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
12\r
13**/\r
14\r
15/**\r
be5f1614 16 Perform a WBINVD and clear both the CD and NW bits of CR0.\r
9f4f2f0e 17\r
be5f1614 18 Enables the caches by executing a WBINVD instruction and then clear both the CD and NW\r
19 bits of CR0 to 0. This function is only available on IA-32 and x64.\r
9f4f2f0e 20\r
21**/\r
22VOID\r
23EFIAPI\r
24AsmEnableCache (\r
25 VOID\r
26 )\r
27{\r
28 _asm {\r
29 wbinvd\r
30 mov eax, cr0\r
31 btr eax, 30\r
32 btr eax, 29\r
33 mov cr0, eax\r
34 }\r
35}\r
36\r