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e1f414b6 | 1 | /** @file\r |
2 | AsmFlushCacheLine function\r | |
3 | \r | |
9095d37b | 4 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
bb817c56 | 5 | This program and the accompanying materials\r |
e1f414b6 | 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 |
e1f414b6 | 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 | |
1efcc4ae | 15 | \r |
f734a10a | 16 | \r |
e1f414b6 | 17 | \r |
42eedea9 | 18 | /**\r |
19 | Flushes a cache line from all the instruction and data caches within the\r | |
20 | coherency domain of the CPU.\r | |
21 | \r | |
22 | Flushed the cache line specified by LinearAddress, and returns LinearAddress.\r | |
030cd1a2 | 23 | This function is only available on IA-32 and x64.\r |
42eedea9 | 24 | \r |
25 | @param LinearAddress The address of the cache line to flush. If the CPU is\r | |
26 | in a physical addressing mode, then LinearAddress is a\r | |
27 | physical address. If the CPU is in a virtual\r | |
28 | addressing mode, then LinearAddress is a virtual\r | |
29 | address.\r | |
30 | \r | |
31 | @return LinearAddress\r | |
32 | **/\r | |
e1f414b6 | 33 | VOID *\r |
34 | EFIAPI\r | |
35 | AsmFlushCacheLine (\r | |
36 | IN VOID *LinearAddress\r | |
37 | )\r | |
38 | {\r | |
881813d7 | 39 | //\r |
9095d37b | 40 | // If the CPU does not support CLFLUSH instruction,\r |
881813d7 MK |
41 | // then promote flush range to flush entire cache.\r |
42 | //\r | |
e1f414b6 | 43 | _asm {\r |
881813d7 MK |
44 | mov eax, 1\r |
45 | cpuid\r | |
46 | test edx, BIT19\r | |
47 | jz NoClflush\r | |
6f7878a9 | 48 | mov eax, dword ptr [LinearAddress]\r |
e1f414b6 | 49 | clflush [eax]\r |
881813d7 MK |
50 | jmp Done\r |
51 | NoClflush:\r | |
52 | wbinvd\r | |
53 | Done:\r | |
e1f414b6 | 54 | }\r |
9095d37b | 55 | \r |
881813d7 | 56 | return LinearAddress;\r |
e1f414b6 | 57 | }\r |
58 | \r |