0,0 → 1,217 |
/* |
* Copyright (c) 2006 Ondrej Palkovsky |
* All rights reserved. |
* |
* 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 name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup libc |
* @{ |
*/ |
/** @file |
*/ |
|
#include <sys/time.h> |
#include <unistd.h> |
#include <ipc/ipc.h> |
#include <stdio.h> |
#include <arch/barrier.h> |
#include <unistd.h> |
#include <atomic.h> |
#include <futex.h> |
#include <sysinfo.h> |
#include <ipc/services.h> |
|
#include <sysinfo.h> |
#include <as.h> |
#include <ddi.h> |
|
/* Pointers to public variables with time */ |
struct { |
volatile sysarg_t seconds1; |
volatile sysarg_t useconds; |
volatile sysarg_t seconds2; |
} *ktime = NULL; |
|
/** Add microseconds to given timeval. |
* |
* @param tv Destination timeval. |
* @param usecs Number of microseconds to add. |
*/ |
void tv_add(struct timeval *tv, suseconds_t usecs) |
{ |
tv->tv_sec += usecs / 1000000; |
tv->tv_usec += usecs % 1000000; |
if (tv->tv_usec > 1000000) { |
tv->tv_sec++; |
tv->tv_usec -= 1000000; |
} |
} |
|
/** Subtract two timevals. |
* |
* @param tv1 First timeval. |
* @param tv2 Second timeval. |
* |
* @return Return difference between tv1 and tv2 (tv1 - tv2) in |
* microseconds. |
*/ |
suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2) |
{ |
suseconds_t result; |
|
result = tv1->tv_usec - tv2->tv_usec; |
result += (tv1->tv_sec - tv2->tv_sec) * 1000000; |
|
return result; |
} |
|
/** Decide if one timeval is greater than the other. |
* |
* @param t1 First timeval. |
* @param t2 Second timeval. |
* |
* @return Return true tv1 is greater than tv2. Otherwise return |
* false. |
*/ |
int tv_gt(struct timeval *tv1, struct timeval *tv2) |
{ |
if (tv1->tv_sec > tv2->tv_sec) |
return 1; |
if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec) |
return 1; |
return 0; |
} |
|
/** Decide if one timeval is greater than or equal to the other. |
* |
* @param tv1 First timeval. |
* @param tv2 Second timeval. |
* |
* @return Return true if tv1 is greater than or equal to tv2. |
* Otherwise return false. |
*/ |
int tv_gteq(struct timeval *tv1, struct timeval *tv2) |
{ |
if (tv1->tv_sec > tv2->tv_sec) |
return 1; |
if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec) |
return 1; |
return 0; |
} |
|
|
/** POSIX gettimeofday |
* |
* The time variables are memory mapped(RO) from kernel, which updates |
* them periodically. As it is impossible to read 2 values atomically, we |
* use a trick: First read a seconds, then read microseconds, then |
* read seconds again. If a second elapsed in the meantime, set it to zero. |
* This provides assurance, that at least the |
* sequence of subsequent gettimeofday calls is ordered. |
*/ |
int gettimeofday(struct timeval *tv, struct timezone *tz) |
{ |
void *mapping; |
sysarg_t s1, s2; |
int rights; |
int res; |
|
if (!ktime) { |
mapping = as_get_mappable_page(PAGE_SIZE); |
/* Get the mapping of kernel clock */ |
res = ipc_share_in_start_1_1(PHONE_NS, mapping, PAGE_SIZE, |
SERVICE_MEM_REALTIME, &rights); |
if (res) { |
printf("Failed to initialize timeofday memarea\n"); |
_exit(1); |
} |
if (!(rights & AS_AREA_READ)) { |
printf("Received bad rights on time area: %X\n", |
rights); |
as_area_destroy(mapping); |
_exit(1); |
} |
ktime = mapping; |
} |
if (tz) { |
tz->tz_minuteswest = 0; |
tz->tz_dsttime = DST_NONE; |
} |
|
s2 = ktime->seconds2; |
read_barrier(); |
tv->tv_usec = ktime->useconds; |
read_barrier(); |
s1 = ktime->seconds1; |
if (s1 != s2) { |
tv->tv_usec = 0; |
tv->tv_sec = s1 > s2 ? s1 : s2; |
} else |
tv->tv_sec = s1; |
|
return 0; |
} |
|
time_t time(time_t *tloc) |
{ |
struct timeval tv; |
|
if (gettimeofday(&tv, NULL)) |
return (time_t) -1; |
if (tloc) |
*tloc = tv.tv_sec; |
return tv.tv_sec; |
} |
|
/** Wait unconditionally for specified number of microseconds */ |
int usleep(unsigned long usec) |
{ |
atomic_t futex = FUTEX_INITIALIZER; |
|
futex_initialize(&futex, 0); |
futex_down_timeout(&futex, usec, 0); |
return 0; |
} |
|
/** Wait unconditionally for specified number of seconds */ |
unsigned int sleep(unsigned int seconds) |
{ |
atomic_t futex = FUTEX_INITIALIZER; |
|
futex_initialize(&futex, 0); |
|
/* Sleep in 1000 second steps to support |
full argument range */ |
while (seconds > 0) { |
unsigned int period = (seconds > 1000) ? 1000 : seconds; |
|
futex_down_timeout(&futex, period * 1000000, 0); |
seconds -= period; |
} |
return 0; |
} |
|
/** @} |
*/ |