2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
22 distribute, sublicense, and/or sell copies of the Software, and to
23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 #ifndef included_time_h
39 #define included_time_h
41 #include <vppinfra/clib.h>
45 /* Total run time in clock cycles
46 since clib_time_init call. */
49 /* Last recorded time stamp. */
52 /* CPU clock frequency. */
53 f64 clocks_per_second;
55 /* 1 / cpu clock frequency: conversion factor
56 from clock cycles into seconds. */
57 f64 seconds_per_clock;
61 /* Time stamp of call to clib_time_init call. */
64 u64 last_verify_cpu_time;
66 /* Same but for reference time (if present). */
67 f64 last_verify_reference_time;
69 u32 log2_clocks_per_second, log2_clocks_per_frequency_verify;
72 /* Return CPU time stamp as 64bit number. */
73 #if defined(__x86_64__) || defined(i386)
75 clib_cpu_time_now (void)
78 asm volatile ("rdtsc":"=a" (a), "=d" (d));
79 return (u64) a + ((u64) d << (u64) 32);
82 #elif defined (__powerpc64__)
85 clib_cpu_time_now (void)
88 asm volatile ("mftb %0":"=r" (t));
92 #elif defined (__SPU__)
95 clib_cpu_time_now (void)
98 return spu_rdch (0x8);
100 return 0 /* __builtin_si_rdch (0x8) FIXME */ ;
104 #elif defined (__powerpc__)
107 clib_cpu_time_now (void)
114 "cmpw %[hi1],%[hi2]\n"
115 "bne 1b\n":[hi1] "=r" (hi1),[hi2] "=r" (hi2),[lo] "=r" (lo));
116 return (u64) lo + ((u64) hi2 << (u64) 32);
119 #elif defined (__aarch64__)
121 clib_cpu_time_now (void)
124 /* User access to cntvct_el0 is enabled in Linux kernel since 3.12. */
125 asm volatile ("mrs %0, cntvct_el0":"=r" (vct));
129 #elif defined (__arm__)
130 #if defined(__ARM_ARCH_8A__)
132 clib_cpu_time_now (void) /* We may run arm64 in aarch32 mode, to leverage 64bit counter */
135 asm volatile ("mrrc p15, 0, %Q0, %R0, c9":"=r" (tsc));
138 #elif defined(__ARM_ARCH_7A__)
140 clib_cpu_time_now (void)
143 asm volatile ("mrc p15, 0, %0, c9, c13, 0":"=r" (tsc));
148 clib_cpu_time_now (void)
151 asm volatile ("mrc p15, 0, %[lo], c15, c12, 1":[lo] "=r" (lo));
156 #elif defined (__xtensa__)
160 clib_cpu_time_now (void)
165 #elif defined (__TMS320C6X__)
168 clib_cpu_time_now (void)
172 asm volatile (" dint\n"
174 " mvc .s2 TSCH,%1\n" " rint\n":"=b" (l), "=b" (h));
176 return ((u64) h << 32) | l;
179 #elif defined(_mips) && __mips == 64
182 clib_cpu_time_now (void)
185 asm volatile ("rdhwr %0,$31\n":"=r" (result));
190 #error "don't know how to read CPU time stamp"
194 void clib_time_verify_frequency (clib_time_t * c);
196 /* Define it as the type returned by clib_time_now */
197 typedef f64 clib_time_type_t;
198 typedef u64 clib_us_time_t;
200 #define CLIB_US_TIME_PERIOD (1e-6)
201 #define CLIB_US_TIME_FREQ (1.0/CLIB_US_TIME_PERIOD)
204 clib_time_now_internal (clib_time_t * c, u64 n)
206 u64 l = c->last_cpu_time;
207 u64 t = c->total_cpu_time;
210 c->total_cpu_time = t;
211 c->last_cpu_time = n;
212 rv = t * c->seconds_per_clock;
215 c->last_verify_cpu_time) >> c->log2_clocks_per_frequency_verify))
216 clib_time_verify_frequency (c);
220 /* Maximum f64 value as max clib_time */
221 #define CLIB_TIME_MAX (1.7976931348623157e+308)
224 clib_time_now (clib_time_t * c)
226 return clib_time_now_internal (c, clib_cpu_time_now ());
230 clib_cpu_time_wait (u64 dt)
232 u64 t_end = clib_cpu_time_now () + dt;
233 while (clib_cpu_time_now () < t_end)
237 void clib_time_init (clib_time_t * c);
242 #include <sys/time.h>
243 #include <sys/resource.h>
245 #include <sys/syscall.h>
247 /* Use 64bit floating point to represent time offset from epoch. */
253 clock_gettime (CLOCK_REALTIME, &ts);
255 /* clock_gettime without indirect syscall uses GLIBC wrappers which
256 we don't want. Just the bare metal, please. */
257 syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
259 return ts.tv_sec + 1e-9 * ts.tv_nsec;
262 /* As above but integer number of nano-seconds. */
264 unix_time_now_nsec (void)
268 clock_gettime (CLOCK_REALTIME, &ts);
270 syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
272 return 1e9 * ts.tv_sec + ts.tv_nsec;
276 unix_time_now_nsec_fraction (u32 * sec, u32 * nsec)
280 clock_gettime (CLOCK_REALTIME, &ts);
282 syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
289 unix_usage_now (void)
292 getrusage (RUSAGE_SELF, &u);
293 return u.ru_utime.tv_sec + 1e-6 * u.ru_utime.tv_usec
294 + u.ru_stime.tv_sec + 1e-6 * u.ru_stime.tv_usec;
300 struct timespec ts, tsrem;
302 ts.tv_nsec = 1e9 * (dt - (f64) ts.tv_sec);
304 while (nanosleep (&ts, &tsrem) < 0)
308 #else /* ! CLIB_UNIX */
317 unix_time_now_nsec (void)
323 unix_time_now_nsec_fraction (u32 * sec, u32 * nsec)
328 unix_usage_now (void)
340 #endif /* included_time_h */
343 * fd.io coding-style-patch-verification: ON
346 * eval: (c-set-style "gnu")