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