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e1f414b6 1/** @file\r
2 AsmMwait function\r
3\r
4 Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
5 All rights reserved. This program and the accompanying materials\r
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
8 http://opensource.org/licenses/bsd-license.php\r
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 Executes an MWAIT instruction.\r
20\r
21 Executes an MWAIT instruction with the register state specified by Eax and\r
22 Ecx. Returns Eax. This function is only available on IA-32 and X64.\r
23\r
24 @param Eax The value to load into EAX or RAX before executing the MONITOR\r
25 instruction.\r
26 @param Ecx The value to load into ECX or RCX before executing the MONITOR\r
27 instruction.\r
28\r
29 @return Eax\r
30\r
31**/\r
e1f414b6 32UINTN\r
33EFIAPI\r
34AsmMwait (\r
35 IN UINTN RegisterEax,\r
36 IN UINTN RegisterEcx\r
37 )\r
38{\r
39 _asm {\r
40 mov eax, RegisterEax\r
41 mov ecx, RegisterEcx\r
42 _emit 0x0f // mwait\r
43 _emit 0x01\r
44 _emit 0xC9\r
45 }\r
46}\r
47\r