| 1 | /*
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| 2 | * Copyright (C) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <sys/time.h>
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| 36 | #include <unistd.h>
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| 37 | #include <ipc/ipc.h>
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| 38 | #include <stdio.h>
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| 39 | #include <arch/barrier.h>
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| 40 | #include <unistd.h>
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| 41 | #include <atomic.h>
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| 42 | #include <futex.h>
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| 43 | #include <sysinfo.h>
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| 44 | #include <ipc/services.h>
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| 45 |
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| 46 | #include <sysinfo.h>
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| 47 | #include <as.h>
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| 48 | #include <ddi.h>
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| 49 |
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| 50 | /* Pointers to public variables with time */
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| 51 | struct {
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| 52 | volatile sysarg_t seconds1;
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| 53 | volatile sysarg_t useconds;
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| 54 | volatile sysarg_t seconds2;
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| 55 | } *ktime = NULL;
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| 56 |
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| 57 |
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| 58 | /** POSIX gettimeofday
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| 59 | *
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| 60 | * The time variables are memory mapped(RO) from kernel, which updates
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| 61 | * them periodically. As it is impossible to read 2 values atomically, we
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| 62 | * use a trick: First read a seconds, then read microseconds, then
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| 63 | * read seconds again. If a second elapsed in the meantime, set it to zero.
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| 64 | * This provides assurance, that at least the
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| 65 | * sequence of subsequent gettimeofday calls is ordered.
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| 66 | */
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| 67 | int gettimeofday(struct timeval *tv, struct timezone *tz)
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| 68 | {
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| 69 | void *mapping;
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| 70 | sysarg_t s1, s2;
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| 71 | sysarg_t rights;
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| 72 | int res;
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| 73 |
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| 74 | if (!ktime) {
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| 75 | mapping = as_get_mappable_page(PAGE_SIZE, (int)
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| 76 | sysinfo_value("clock.fcolor"));
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| 77 | /* Get the mapping of kernel clock */
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| 78 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, (sysarg_t)
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| 79 | mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL, &rights,
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| 80 | NULL);
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| 81 | if (res) {
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| 82 | printf("Failed to initialize timeofday memarea\n");
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| 83 | _exit(1);
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| 84 | }
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| 85 | if (! (rights & AS_AREA_READ)) {
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| 86 | printf("Received bad rights on time area: %X\n",
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| 87 | rights);
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| 88 | as_area_destroy(mapping);
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| 89 | _exit(1);
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| 90 | }
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| 91 | ktime = mapping;
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| 92 | }
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| 93 | if (tz) {
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| 94 | tz->tz_minuteswest = 0;
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| 95 | tz->tz_dsttime = DST_NONE;
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| 96 | }
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| 97 |
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| 98 | s2 = ktime->seconds2;
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| 99 | read_barrier();
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| 100 | tv->tv_usec = ktime->useconds;
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| 101 | read_barrier();
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| 102 | s1 = ktime->seconds1;
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| 103 | if (s1 != s2) {
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| 104 | tv->tv_usec = 0;
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| 105 | tv->tv_sec = s1 > s2 ? s1 : s2;
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| 106 | } else
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| 107 | tv->tv_sec = s1;
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| 108 |
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| 109 | return 0;
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| 110 | }
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| 111 |
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| 112 | /** Wait unconditionally for specified microseconds */
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| 113 | void usleep(unsigned long usec)
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| 114 | {
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| 115 | atomic_t futex = FUTEX_INITIALIZER;
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| 116 |
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| 117 | futex_initialize(&futex,0);
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| 118 | futex_down_timeout(&futex, usec, 0);
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| 119 | }
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| 120 |
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| 121 | /** @}
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| 122 | */
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