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43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/** @file
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AsmMonitor function
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Sets up a monitor buffer that is used by AsmMwait().
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Executes a MONITOR instruction with the register state specified by Eax, Ecx
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and Edx. 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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@param RegisterEdx The value to load into EDX or RDX 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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AsmMonitor (
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IN UINTN RegisterEax,
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IN UINTN RegisterEcx,
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IN UINTN RegisterEdx
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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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mov edx, RegisterEdx
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_emit 0x0f // monitor
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_emit 0x01
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_emit 0xc8
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}
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}
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