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/** @file
AsmMwait function
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
/**
Executes an MWAIT instruction.
Executes an MWAIT instruction with the register state specified by Eax and
Ecx. Returns Eax. This function is only available on IA-32 and x64.
@param RegisterEax The value to load into EAX or RAX before executing the MONITOR
instruction.
@param RegisterEcx The value to load into ECX or RCX before executing the MONITOR
instruction.
@return RegisterEax
**/
UINTN
EFIAPI
AsmMwait (
IN UINTN RegisterEax,
IN UINTN RegisterEcx
)
{
_asm {
mov eax, RegisterEax
mov ecx, RegisterEcx
_emit 0x0f // mwait
_emit 0x01
_emit 0xC9
}
}
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