timing.h

00001 /*
00002  * SpanDSP - a series of DSP components for telephony
00003  *
00004  * timing.h - Provide access to the Pentium/Athlon TSC timer register
00005  *
00006  * Written by Steve Underwood <steveu@coppice.org>
00007  *
00008  * Copyright (C) 2001 Steve Underwood
00009  *
00010  * All rights reserved.
00011  *
00012  * This program is free software; you can redistribute it and/or modify
00013  * it under the terms of the GNU General Public License as published by
00014  * the Free Software Foundation; either version 2 of the License, or
00015  * (at your option) any later version.
00016  *
00017  * This program is distributed in the hope that it will be useful,
00018  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00019  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00020  * GNU General Public License for more details.
00021  *
00022  * You should have received a copy of the GNU General Public License
00023  * along with this program; if not, write to the Free Software
00024  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00025  *
00026  * $Id: timing.h,v 1.3 2005/11/27 06:10:12 steveu Exp $
00027  */
00028 
00029 #if !defined(_TIMING_H_)
00030 #define _TIMING_H_
00031 
00032 #ifdef __cplusplus
00033 extern "C" {
00034 #endif
00035 
00036 #if defined(__i386__)
00037 static inline uint64_t rdtscll(void)
00038 {
00039     uint64_t now;
00040 
00041     __asm__ __volatile__(" rdtsc\n" : "=A" (now));
00042     return now;
00043 }
00044 /*- End of function --------------------------------------------------------*/
00045 #elif defined(__x86_64__)
00046 static inline uint64_t rdtscll(void)
00047 {
00048     unsigned int __a;
00049     unsigned int __d;
00050 
00051     __asm__ __volatile__(" rdtsc\n" : "=a" (__a), "=d" (__d));
00052     return ((unsigned long) __a) | (((unsigned long) __d) << 32);
00053 }
00054 /*- End of function --------------------------------------------------------*/
00055 #endif
00056 
00057 #ifdef __cplusplus
00058 }
00059 #endif
00060 
00061 #endif
00062 /*- End of file ------------------------------------------------------------*/

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