| 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; |
| } |
| |
| /** @} |
| */ |