Code Scrub for MdePkg.

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / Mwait.c

/** @file\r
  AsmMwait function\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
//\r
// Include common header file for this module.\r
//\r
\r
\r
/**\r
  Executes an MWAIT instruction.\r
\r
  Executes an MWAIT instruction with the register state specified by Eax and\r
  Ecx. Returns Eax. This function is only available on IA-32 and X64.\r
\r
  @param  Eax The value to load into EAX or RAX before executing the MONITOR\r
              instruction.\r
  @param  Ecx The value to load into ECX or RCX before executing the MONITOR\r
              instruction.\r
\r
  @return Eax\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmMwait (\r
  IN      UINTN                     RegisterEax,\r
  IN      UINTN                     RegisterEcx\r
  )\r
{\r
  _asm {\r
    mov     eax, RegisterEax\r
    mov     ecx, RegisterEcx\r
    _emit   0x0f              // mwait\r
    _emit   0x01\r
    _emit   0xC9\r
  }\r
}\r
\r