1 /** @file 2 AsmMonitor function 3 4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 /** 16 Sets up a monitor buffer that is used by AsmMwait(). 17 18 Executes a MONITOR instruction with the register state specified by Eax, Ecx 19 and Edx. Returns Eax. This function is only available on IA-32 and x64. 20 21 @param RegisterEax The value to load into EAX or RAX before executing the MONITOR 22 instruction. 23 @param RegisterEcx The value to load into ECX or RCX before executing the MONITOR 24 instruction. 25 @param RegisterEdx The value to load into EDX or RDX before executing the MONITOR 26 instruction. 27 28 @return RegisterEax 29 30 **/ 31 UINTN 32 EFIAPI 33 AsmMonitor ( 34 IN UINTN RegisterEax, 35 IN UINTN RegisterEcx, 36 IN UINTN RegisterEdx 37 ) 38 { 39 _asm { 40 mov eax, RegisterEax 41 mov ecx, RegisterEcx 42 mov edx, RegisterEdx 43 _emit 0x0f // monitor 44 _emit 0x01 45 _emit 0xc8 46 } 47 } 48 49
