/* * SpanDSP - a series of DSP components for telephony * * timing.h - Provide access to the Pentium/Athlon TSC timer register * * Written by Steve Underwood * * 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. * * $Id: timing.h,v 1.1.1.1 2009/11/19 12:10:48 steveu Exp $ */ #if !defined(_TIMING_H_) #define _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) { unsigned int a; unsigned int 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 ------------------------------------------------------------*/