timing.h
/*
* SpanDSP - a series of DSP components for telephony
*
* timing.h - Provide access to the Pentium/Athlon TSC timer register
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2001 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if !defined(_SPANDSP_TIMING_H_)
#define _SPANDSP_TIMING_H_
#if defined(__cplusplus)
extern "C"
{
#endif
#if defined(__MSVC__)
__declspec(naked) unsigned __int64 __cdecl rdtscll(void)
{
__asm
{
rdtsc
ret ; return value at EDX:EAX
}
}
/*- End of function --------------------------------------------------------*/
#elif defined(__GNUC__)
#if defined(__i386__)
static __inline__ uint64_t rdtscll(void)
{
uint64_t now;
__asm__ __volatile__(" rdtsc\n" : "=A" (now));
return now;
}
/*- End of function --------------------------------------------------------*/
#elif defined(__x86_64__)
static __inline__ uint64_t rdtscll(void)
{
uint32_t a;
uint32_t d;
/* For x86_64 we need to merge the result in 2 32 bit registers
into one clean 64 bit result. */
__asm__ __volatile__(" rdtsc\n" : "=a" (a), "=d" (d));
return ((uint64_t) a) | (((uint64_t) d) << 32);
}
/*- End of function --------------------------------------------------------*/
#else
static __inline__ uint64_t rdtscll(void)
{
/* This architecture doesn't have a suitable timer */
return 0llu;
}
/*- End of function --------------------------------------------------------*/
#endif
#endif
#if defined(__cplusplus)
}
#endif
#endif
/*- End of file ------------------------------------------------------------*/