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/*
* Copyright (c) 2005 Mellanox Technologies Ltd.,
* (c) 2005 Harald Welte <laforge@gnumonks.org>, All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* $Id$
*/
#ifndef GET_CLOCK_H
#define GET_CLOCK_H
#if 0
#define _POSIX_C_SOURCE 199506L
#include <unistd.h>
#include <time.h>
/* Ideally we would be using clock_getres() and clock_gettime().
* glibc manpage says CLOCK_PROCESS_CPUTIME_ID is only defined if it is
* actually present. however, on ppc64 it is defined but not implemented. */
#ifdef CLOCK_PROCESS_CPUTIME_ID
typedef long cycles_t;
static inline cycles_t get_cycles()
{
struct timespec ts;
#if defined (__x86_64__) || defined(__i386__)
asm volatile ("cpuid" : : : "eax", "ebx", "ecx", "edx" ); /* flush pipeline */
#endif
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts);
return ts.tv_nsec;
}
#endif
#endif
#if defined (__x86_64__) || defined(__i386__)
/* Note: only x86 CPUs which have rdtsc instruction are supported. */
typedef unsigned long long cycles_t;
static inline cycles_t get_cycles()
{
unsigned low, high;
unsigned long long val;
asm volatile ("cpuid" : : : "eax", "ebx", "ecx", "edx" ); /* flush pipeline */
asm volatile ("rdtsc" : "=a" (low), "=d" (high));
val = high;
val = (val << 32) | low;
return val;
}
#elif defined(__PPC64__)
/* Note: only PPC CPUs which have mftb instruction are supported. */
typedef unsigned long long cycles_t;
static inline cycles_t get_cycles()
{
cycles_t ret;
asm volatile ("mftb %0" : "=r" (ret) : );
return ret;
}
#elif defined(__sparc__)
/* Note: only sparc64 supports this register */
typedef unsigned long long cycles_t;
#define TICK_PRIV_BIT (1ULL << 63)
static inline cycles_t get_cycles()
{
cycles_t ret;
#if defined(__sparcv9) || defined(__arch64__)
asm volatile ("rd %%tick, %0" : "=r" (ret));
#else
asm volatile ("rd %%tick, %%g1\n\t"
"srlx %%g1, 32, %H0\n\t"
"srl %%g1, 0, %L0"
: "=r" (ret)
: /* no inputs */
: "g1");
#endif
return ret & ~TICK_PRIV_BIT;
}
#elif defined(__PPC__)
#define CPU_FTR_601 0x00000100
typedef unsigned long cycles_t;
static inline cycles_t get_cycles()
{
cycles_t ret;
asm volatile (
"98: mftb %0\n"
"99:\n"
".section __ftr_fixup,\"a\"\n"
" .long %1\n"
" .long 0\n"
" .long 98b\n"
" .long 99b\n"
".previous"
: "=r" (ret) : "i" (CPU_FTR_601));
return ret;
}
#elif defined(__ia64__) || defined(__mips__) || \
defined(__s390__)
/* Itanium2 and up has ar.itc (Itanium1 has errata) */
/* PPC64 has mftb */
#include <asm/timex.h>
#else
#warning get_cycles not implemented for this architecture: attempt asm/timex.h
#include <asm/timex.h>
#endif
extern double get_cpu_mhz(void);
#endif /* GET_CLOCK_H */
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