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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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| 27 | */ |
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| 28 | |||
| 1449 | palkovsky | 29 | #include <sys/time.h> |
| 1435 | palkovsky | 30 | #include <unistd.h> |
| 31 | #include <ipc/ipc.h> |
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| 32 | #include <stdio.h> |
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| 33 | #include <arch/barrier.h> |
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| 1452 | palkovsky | 34 | #include <unistd.h> |
| 35 | #include <atomic.h> |
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| 36 | #include <futex.h> |
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| 1435 | palkovsky | 37 | |
| 38 | #include <sysinfo.h> |
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| 39 | #include <as.h> |
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| 40 | #include <ddi.h> |
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| 41 | |||
| 42 | /* Pointers to public variables with time */ |
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| 43 | struct { |
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| 1439 | palkovsky | 44 | volatile sysarg_t seconds1; |
| 1435 | palkovsky | 45 | volatile sysarg_t useconds; |
| 1439 | palkovsky | 46 | volatile sysarg_t seconds2; |
| 1435 | palkovsky | 47 | } *ktime = NULL; |
| 48 | |||
| 49 | |||
| 50 | /** POSIX gettimeofday |
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| 51 | * |
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| 52 | * The time variables are memory mapped(RO) from kernel, which updates |
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| 53 | * them periodically. As it is impossible to read 2 values atomically, we |
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| 54 | * use a trick: First read a seconds, then read microseconds, then |
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| 55 | * read seconds again. If a second elapsed in the meantime, read |
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| 56 | * useconds again. This provides assurance, that at least the |
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| 57 | * sequence of subsequent gettimeofday calls is ordered. |
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| 58 | */ |
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| 59 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
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| 60 | { |
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| 61 | void *mapping; |
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| 1439 | palkovsky | 62 | sysarg_t s1, s2; |
| 1462 | palkovsky | 63 | sysarg_t rights; |
| 1435 | palkovsky | 64 | int res; |
| 65 | |||
| 66 | if (!ktime) { |
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| 1501 | palkovsky | 67 | mapping = as_get_mappable_page(PAGE_SIZE); |
| 1435 | palkovsky | 68 | /* Get the mapping of kernel clock */ |
| 69 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
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| 1501 | palkovsky | 70 | mapping, PAGE_SIZE, 0, |
| 1462 | palkovsky | 71 | NULL,&rights,NULL); |
| 1435 | palkovsky | 72 | if (res) { |
| 73 | printf("Failed to initialize timeofday memarea\n"); |
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| 74 | _exit(1); |
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| 75 | } |
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| 1547 | palkovsky | 76 | if (! (rights & AS_AREA_READ)) { |
| 1462 | palkovsky | 77 | printf("Received bad rights on time area: %X\n", |
| 78 | rights); |
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| 1501 | palkovsky | 79 | as_area_destroy(mapping); |
| 1462 | palkovsky | 80 | _exit(1); |
| 81 | } |
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| 1501 | palkovsky | 82 | ktime = mapping; |
| 1435 | palkovsky | 83 | } |
| 1441 | palkovsky | 84 | if (tz) { |
| 85 | tz->tz_minuteswest = 0; |
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| 86 | tz->tz_dsttime = DST_NONE; |
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| 87 | } |
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| 88 | |||
| 1442 | palkovsky | 89 | s2 = ktime->seconds2; |
| 90 | read_barrier(); |
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| 1435 | palkovsky | 91 | tv->tv_usec = ktime->useconds; |
| 92 | read_barrier(); |
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| 1442 | palkovsky | 93 | s1 = ktime->seconds1; |
| 1439 | palkovsky | 94 | if (s1 != s2) { |
| 95 | tv->tv_usec = 0; |
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| 96 | tv->tv_sec = s1 > s2 ? s1 : s2; |
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| 97 | } else |
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| 98 | tv->tv_sec = s1; |
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| 1435 | palkovsky | 99 | |
| 100 | return 0; |
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| 101 | } |
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| 1452 | palkovsky | 102 | |
| 1453 | palkovsky | 103 | /** Wait unconditionally for specified microseconds */ |
| 1452 | palkovsky | 104 | void usleep(unsigned long usec) |
| 105 | { |
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| 106 | atomic_t futex = FUTEX_INITIALIZER; |
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| 107 | |||
| 108 | futex_initialize(&futex,0); |
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| 109 | futex_down_timeout(&futex, usec, 0); |
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| 110 | } |