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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10593 6f19259b-4bc3-4df7-8a09-765794883524
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/** @file
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AsmMwait function
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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/**
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Executes an MWAIT instruction.
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Executes an MWAIT instruction with the register state specified by Eax and
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Ecx. Returns Eax. This function is only available on IA-32 and x64.
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@param RegisterEax The value to load into EAX or RAX before executing the MONITOR
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instruction.
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@param RegisterEcx The value to load into ECX or RCX before executing the MONITOR
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instruction.
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@return RegisterEax
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**/
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UINTN
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EFIAPI
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AsmMwait (
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IN UINTN RegisterEax,
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IN UINTN RegisterEcx
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)
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{
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_asm {
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mov eax, RegisterEax
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mov ecx, RegisterEcx
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_emit 0x0f // mwait
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_emit 0x01
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_emit 0xC9
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}
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}
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