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5
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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * timing.h - Provide access to the Pentium/Athlon TSC timer register
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2001 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * $Id: timing.h,v 1.6 2006/10/24 13:45:28 steveu Exp $
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26 */
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27
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28 #if !defined(_TIMING_H_)
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29 #define _TIMING_H_
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30
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31 #ifdef __cplusplus
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32 extern "C" {
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33 #endif
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34
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35 #if defined(__i386__)
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36 static __inline__ uint64_t rdtscll(void)
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37 {
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38 uint64_t now;
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39
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40 __asm__ __volatile__(" rdtsc\n" : "=A" (now));
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41 return now;
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42 }
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43 /*- End of function --------------------------------------------------------*/
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44 #elif defined(__x86_64__)
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45 static __inline__ uint64_t rdtscll(void)
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46 {
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47 unsigned int __a;
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48 unsigned int __d;
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49
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50 __asm__ __volatile__(" rdtsc\n" : "=a" (__a), "=d" (__d));
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51 return ((unsigned long) __a) | (((unsigned long) __d) << 32);
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52 }
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53 /*- End of function --------------------------------------------------------*/
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54 #endif
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55
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56 #ifdef __cplusplus
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57 }
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58 #endif
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59
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60 #endif
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61 /*- End of file ------------------------------------------------------------*/
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