Rev 1701 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1435 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2006 Ondrej Palkovsky |
||
| 3 | * All rights reserved. |
||
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 1653 | cejka | 27 | */ |
| 28 | |||
| 1719 | decky | 29 | /** @addtogroup libc |
| 1653 | cejka | 30 | * @{ |
| 31 | */ |
||
| 32 | /** @file |
||
| 1435 | palkovsky | 33 | */ |
| 34 | |||
| 1449 | palkovsky | 35 | #include <sys/time.h> |
| 1435 | palkovsky | 36 | #include <unistd.h> |
| 37 | #include <ipc/ipc.h> |
||
| 38 | #include <stdio.h> |
||
| 39 | #include <arch/barrier.h> |
||
| 1452 | palkovsky | 40 | #include <unistd.h> |
| 41 | #include <atomic.h> |
||
| 42 | #include <futex.h> |
||
| 1596 | palkovsky | 43 | #include <ipc/services.h> |
| 1435 | palkovsky | 44 | |
| 45 | #include <sysinfo.h> |
||
| 46 | #include <as.h> |
||
| 47 | #include <ddi.h> |
||
| 48 | |||
| 49 | /* Pointers to public variables with time */ |
||
| 50 | struct { |
||
| 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 |
||
| 58 | * |
||
| 59 | * The time variables are memory mapped(RO) from kernel, which updates |
||
| 60 | * them periodically. As it is impossible to read 2 values atomically, we |
||
| 61 | * use a trick: First read a seconds, then read microseconds, then |
||
| 1701 | palkovsky | 62 | * read seconds again. If a second elapsed in the meantime, set it to zero. |
| 63 | * This provides assurance, that at least the |
||
| 1435 | palkovsky | 64 | * sequence of subsequent gettimeofday calls is ordered. |
| 65 | */ |
||
| 66 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
||
| 67 | { |
||
| 68 | void *mapping; |
||
| 1439 | palkovsky | 69 | sysarg_t s1, s2; |
| 1462 | palkovsky | 70 | sysarg_t rights; |
| 1435 | palkovsky | 71 | int res; |
| 72 | |||
| 73 | if (!ktime) { |
||
| 1501 | palkovsky | 74 | mapping = as_get_mappable_page(PAGE_SIZE); |
| 1435 | palkovsky | 75 | /* Get the mapping of kernel clock */ |
| 1719 | decky | 76 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, (sysarg_t) mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, NULL, &rights, NULL); |
| 1435 | palkovsky | 77 | if (res) { |
| 78 | printf("Failed to initialize timeofday memarea\n"); |
||
| 79 | _exit(1); |
||
| 80 | } |
||
| 1547 | palkovsky | 81 | if (! (rights & AS_AREA_READ)) { |
| 1462 | palkovsky | 82 | printf("Received bad rights on time area: %X\n", |
| 83 | rights); |
||
| 1501 | palkovsky | 84 | as_area_destroy(mapping); |
| 1462 | palkovsky | 85 | _exit(1); |
| 86 | } |
||
| 1501 | palkovsky | 87 | ktime = mapping; |
| 1435 | palkovsky | 88 | } |
| 1441 | palkovsky | 89 | if (tz) { |
| 90 | tz->tz_minuteswest = 0; |
||
| 91 | tz->tz_dsttime = DST_NONE; |
||
| 92 | } |
||
| 93 | |||
| 1442 | palkovsky | 94 | s2 = ktime->seconds2; |
| 95 | read_barrier(); |
||
| 1435 | palkovsky | 96 | tv->tv_usec = ktime->useconds; |
| 97 | read_barrier(); |
||
| 1442 | palkovsky | 98 | s1 = ktime->seconds1; |
| 1439 | palkovsky | 99 | if (s1 != s2) { |
| 100 | tv->tv_usec = 0; |
||
| 101 | tv->tv_sec = s1 > s2 ? s1 : s2; |
||
| 102 | } else |
||
| 103 | tv->tv_sec = s1; |
||
| 1435 | palkovsky | 104 | |
| 105 | return 0; |
||
| 106 | } |
||
| 1452 | palkovsky | 107 | |
| 1453 | palkovsky | 108 | /** Wait unconditionally for specified microseconds */ |
| 1452 | palkovsky | 109 | void usleep(unsigned long usec) |
| 110 | { |
||
| 111 | atomic_t futex = FUTEX_INITIALIZER; |
||
| 112 | |||
| 113 | futex_initialize(&futex,0); |
||
| 114 | futex_down_timeout(&futex, usec, 0); |
||
| 115 | } |
||
| 1653 | cejka | 116 | |
| 117 | |||
| 1719 | decky | 118 | /** @} |
| 1653 | cejka | 119 | */ |