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| Rev | Author | Line No. | Line |
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| 1435 | palkovsky | 1 | /* |
| 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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| 1653 | cejka | 27 | */ |
| 28 | |||
| 29 | /** @addtogroup libc |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 1435 | palkovsky | 33 | */ |
| 34 | |||
| 1449 | palkovsky | 35 | #include <sys/time.h> |
| 1435 | palkovsky | 36 | #include <unistd.h> |
| 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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| 1452 | palkovsky | 40 | #include <unistd.h> |
| 41 | #include <atomic.h> |
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| 42 | #include <futex.h> |
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| 1596 | palkovsky | 43 | #include <ipc/services.h> |
| 1435 | palkovsky | 44 | |
| 45 | #include <sysinfo.h> |
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| 46 | #include <as.h> |
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| 47 | #include <ddi.h> |
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| 48 | |||
| 49 | /* Pointers to public variables with time */ |
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| 50 | struct { |
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| 1439 | palkovsky | 51 | volatile sysarg_t seconds1; |
| 1435 | palkovsky | 52 | volatile sysarg_t useconds; |
| 1439 | palkovsky | 53 | volatile sysarg_t seconds2; |
| 1435 | palkovsky | 54 | } *ktime = NULL; |
| 55 | |||
| 56 | |||
| 57 | /** POSIX gettimeofday |
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| 58 | * |
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| 59 | * The time variables are memory mapped(RO) from kernel, which updates |
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| 60 | * them periodically. As it is impossible to read 2 values atomically, we |
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| 61 | * use a trick: First read a seconds, then read microseconds, then |
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| 62 | * read seconds again. If a second elapsed in the meantime, read |
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| 63 | * useconds again. This provides assurance, that at least the |
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| 64 | * sequence of subsequent gettimeofday calls is ordered. |
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| 65 | */ |
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| 66 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
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| 67 | { |
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| 68 | void *mapping; |
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| 1439 | palkovsky | 69 | sysarg_t s1, s2; |
| 1462 | palkovsky | 70 | sysarg_t rights; |
| 1435 | palkovsky | 71 | int res; |
| 72 | |||
| 73 | if (!ktime) { |
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| 1501 | palkovsky | 74 | mapping = as_get_mappable_page(PAGE_SIZE); |
| 1435 | palkovsky | 75 | /* Get the mapping of kernel clock */ |
| 76 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
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| 1596 | palkovsky | 77 | mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, |
| 1462 | palkovsky | 78 | NULL,&rights,NULL); |
| 1435 | palkovsky | 79 | if (res) { |
| 80 | printf("Failed to initialize timeofday memarea\n"); |
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| 81 | _exit(1); |
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| 82 | } |
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| 1547 | palkovsky | 83 | if (! (rights & AS_AREA_READ)) { |
| 1462 | palkovsky | 84 | printf("Received bad rights on time area: %X\n", |
| 85 | rights); |
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| 1501 | palkovsky | 86 | as_area_destroy(mapping); |
| 1462 | palkovsky | 87 | _exit(1); |
| 88 | } |
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| 1501 | palkovsky | 89 | ktime = mapping; |
| 1435 | palkovsky | 90 | } |
| 1441 | palkovsky | 91 | if (tz) { |
| 92 | tz->tz_minuteswest = 0; |
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| 93 | tz->tz_dsttime = DST_NONE; |
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| 94 | } |
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| 95 | |||
| 1442 | palkovsky | 96 | s2 = ktime->seconds2; |
| 97 | read_barrier(); |
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| 1435 | palkovsky | 98 | tv->tv_usec = ktime->useconds; |
| 99 | read_barrier(); |
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| 1442 | palkovsky | 100 | s1 = ktime->seconds1; |
| 1439 | palkovsky | 101 | if (s1 != s2) { |
| 102 | tv->tv_usec = 0; |
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| 103 | tv->tv_sec = s1 > s2 ? s1 : s2; |
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| 104 | } else |
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| 105 | tv->tv_sec = s1; |
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| 1435 | palkovsky | 106 | |
| 107 | return 0; |
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| 108 | } |
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| 1452 | palkovsky | 109 | |
| 1453 | palkovsky | 110 | /** Wait unconditionally for specified microseconds */ |
| 1452 | palkovsky | 111 | void usleep(unsigned long usec) |
| 112 | { |
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| 113 | atomic_t futex = FUTEX_INITIALIZER; |
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| 114 | |||
| 115 | futex_initialize(&futex,0); |
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| 116 | futex_down_timeout(&futex, usec, 0); |
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| 117 | } |
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| 1653 | cejka | 118 | |
| 119 | |||
| 120 | /** @} |
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| 121 | */ |
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| 122 | |||
| 123 |