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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 | #define TMAREA (100*1024*1024) |
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60 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
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61 | { |
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62 | void *mapping; |
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1439 | palkovsky | 63 | sysarg_t s1, s2; |
1462 | palkovsky | 64 | sysarg_t rights; |
1435 | palkovsky | 65 | int res; |
66 | |||
67 | if (!ktime) { |
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68 | /* TODO: specify better, where to map the area */ |
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69 | /* Get the mapping of kernel clock */ |
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70 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
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71 | TMAREA, |
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72 | PAGE_SIZE, |
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1462 | palkovsky | 73 | 0, |
74 | NULL,&rights,NULL); |
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1435 | palkovsky | 75 | if (res) { |
76 | printf("Failed to initialize timeofday memarea\n"); |
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77 | _exit(1); |
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78 | } |
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1462 | palkovsky | 79 | if (rights != (AS_AREA_READ | AS_AREA_CACHEABLE)) { |
80 | printf("Received bad rights on time area: %X\n", |
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81 | rights); |
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82 | as_area_destroy(TMAREA); |
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83 | _exit(1); |
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84 | } |
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1435 | palkovsky | 85 | ktime = (void *) (TMAREA); |
86 | } |
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1441 | palkovsky | 87 | if (tz) { |
88 | tz->tz_minuteswest = 0; |
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89 | tz->tz_dsttime = DST_NONE; |
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90 | } |
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91 | |||
1442 | palkovsky | 92 | s2 = ktime->seconds2; |
93 | read_barrier(); |
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1435 | palkovsky | 94 | tv->tv_usec = ktime->useconds; |
95 | read_barrier(); |
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1442 | palkovsky | 96 | s1 = ktime->seconds1; |
1439 | palkovsky | 97 | if (s1 != s2) { |
98 | tv->tv_usec = 0; |
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99 | tv->tv_sec = s1 > s2 ? s1 : s2; |
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100 | } else |
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101 | tv->tv_sec = s1; |
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1435 | palkovsky | 102 | |
103 | return 0; |
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104 | } |
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1452 | palkovsky | 105 | |
1453 | palkovsky | 106 | /** Wait unconditionally for specified microseconds */ |
1452 | palkovsky | 107 | void usleep(unsigned long usec) |
108 | { |
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109 | atomic_t futex = FUTEX_INITIALIZER; |
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110 | |||
111 | futex_initialize(&futex,0); |
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112 | futex_down_timeout(&futex, usec, 0); |
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113 | } |