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