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1 | /** @file\r | |
2 | AsmMonitor 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 | |
15 | \r | |
16 | \r | |
17 | \r | |
18 | /**\r | |
19 | Sets up a monitor buffer that is used by AsmMwait().\r | |
20 | \r | |
21 | Executes a MONITOR instruction with the register state specified by Eax, Ecx\r | |
22 | and Edx. 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 | @param Edx The value to load into EDX or RDX before executing the MONITOR\r | |
29 | instruction.\r | |
30 | \r | |
31 | @return Eax\r | |
32 | \r | |
33 | **/\r | |
34 | UINTN\r | |
35 | EFIAPI\r | |
36 | AsmMonitor (\r | |
37 | IN UINTN RegisterEax,\r | |
38 | IN UINTN RegisterEcx,\r | |
39 | IN UINTN RegisterEdx\r | |
40 | )\r | |
41 | {\r | |
42 | _asm {\r | |
43 | mov eax, RegisterEax\r | |
44 | mov ecx, RegisterEcx\r | |
45 | mov edx, RegisterEdx\r | |
46 | _emit 0x0f // monitor\r | |
47 | _emit 0x01\r | |
48 | _emit 0xc8\r | |
49 | }\r | |
50 | }\r | |
51 | \r |