summaryrefslogtreecommitdiffstats
path: root/include/gapk/get_cycles.h
blob: ec530fc415f36189cd4d9229f506adeea8ca6657 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
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"); /* 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"); /* 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 */