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Diffstat (limited to 'include/osmocom/gapk/get_cycles.h')
| -rw-r--r-- | include/osmocom/gapk/get_cycles.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/include/osmocom/gapk/get_cycles.h b/include/osmocom/gapk/get_cycles.h new file mode 100644 index 0000000..9eb7bc3 --- /dev/null +++ b/include/osmocom/gapk/get_cycles.h @@ -0,0 +1,138 @@ +/* + * 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 */ |