1 /** @file 2 AsmReadTsc 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 17 18 /** 19 Reads the current value of Time Stamp Counter (TSC). 20 21 Reads and returns the current value of TSC. This function is only available 22 on IA-32 and x64. 23 24 @return The current value of TSC 25 26 **/ 27 UINT64 28 EFIAPI 29 AsmReadTsc ( 30 VOID 31 ) 32 { 33 _asm { 34 rdtsc 35 } 36 } 37 38
