84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* timing.h - Provide access to the Pentium/Athlon TSC timer register
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2001 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: timing.h,v 1.1.1.1 2009/11/19 12:10:48 steveu Exp $
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*/
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#if !defined(_TIMING_H_)
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#define _TIMING_H_
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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#if defined(__MSVC__)
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__declspec(naked) unsigned __int64 __cdecl rdtscll(void)
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{
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__asm
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{
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rdtsc
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ret ; return value at EDX:EAX
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}
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}
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/*- End of function --------------------------------------------------------*/
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#elif defined(__GNUC__)
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#if defined(__i386__)
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static __inline__ uint64_t rdtscll(void)
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{
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uint64_t now;
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__asm__ __volatile__(" rdtsc\n" : "=A" (now));
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return now;
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}
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/*- End of function --------------------------------------------------------*/
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#elif defined(__x86_64__)
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static __inline__ uint64_t rdtscll(void)
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{
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unsigned int a;
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unsigned int d;
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/* For x86_64 we need to merge the result in 2 32 bit registers
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into one clean 64 bit result. */
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__asm__ __volatile__(" rdtsc\n" : "=a" (a), "=d" (d));
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return ((uint64_t) a) | (((uint64_t) d) << 32);
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}
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/*- End of function --------------------------------------------------------*/
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#else
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static __inline__ uint64_t rdtscll(void)
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{
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/* This architecture doesn't have a suitable timer */
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return 0llu;
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}
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/*- End of function --------------------------------------------------------*/
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#endif
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#endif
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/*- End of file ------------------------------------------------------------*/
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