1 /** @file 2 AsmReadPmc 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 Reads the current value of a Performance Counter (PMC). 17 18 Reads and returns the current value of performance counter specified by 19 Index. This function is only available on IA-32 and x64. 20 21 @param Index The 32-bit Performance Counter index to read. 22 23 @return The value of the PMC specified by Index. 24 25 **/ 26 UINT64 27 EFIAPI 28 AsmReadPmc ( 29 IN UINT32 Index 30 ) 31 { 32 _asm { 33 mov ecx, Index 34 rdpmc 35 } 36 } 37 38
