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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
- | 29 | /** @addtogroup libc |
|
- | 30 | * @{ |
|
- | 31 | */ |
|
- | 32 | /** @file |
|
- | 33 | */ |
|
- | 34 | ||
29 | #include <sys/time.h> |
35 | #include <sys/time.h> |
30 | #include <unistd.h> |
36 | #include <unistd.h> |
31 | #include <ipc/ipc.h> |
37 | #include <ipc/ipc.h> |
32 | #include <stdio.h> |
38 | #include <stdio.h> |
33 | #include <arch/barrier.h> |
39 | #include <arch/barrier.h> |
34 | #include <unistd.h> |
40 | #include <unistd.h> |
35 | #include <atomic.h> |
41 | #include <atomic.h> |
36 | #include <futex.h> |
42 | #include <futex.h> |
37 | #include <ipc/services.h> |
43 | #include <ipc/services.h> |
38 | 44 | ||
39 | #include <sysinfo.h> |
45 | #include <sysinfo.h> |
40 | #include <as.h> |
46 | #include <as.h> |
41 | #include <ddi.h> |
47 | #include <ddi.h> |
42 | 48 | ||
43 | /* Pointers to public variables with time */ |
49 | /* Pointers to public variables with time */ |
44 | struct { |
50 | struct { |
45 | volatile sysarg_t seconds1; |
51 | volatile sysarg_t seconds1; |
46 | volatile sysarg_t useconds; |
52 | volatile sysarg_t useconds; |
47 | volatile sysarg_t seconds2; |
53 | volatile sysarg_t seconds2; |
48 | } *ktime = NULL; |
54 | } *ktime = NULL; |
49 | 55 | ||
50 | 56 | ||
51 | /** POSIX gettimeofday |
57 | /** POSIX gettimeofday |
52 | * |
58 | * |
53 | * The time variables are memory mapped(RO) from kernel, which updates |
59 | * The time variables are memory mapped(RO) from kernel, which updates |
54 | * them periodically. As it is impossible to read 2 values atomically, we |
60 | * them periodically. As it is impossible to read 2 values atomically, we |
55 | * use a trick: First read a seconds, then read microseconds, then |
61 | * use a trick: First read a seconds, then read microseconds, then |
56 | * read seconds again. If a second elapsed in the meantime, read |
62 | * read seconds again. If a second elapsed in the meantime, read |
57 | * useconds again. This provides assurance, that at least the |
63 | * useconds again. This provides assurance, that at least the |
58 | * sequence of subsequent gettimeofday calls is ordered. |
64 | * sequence of subsequent gettimeofday calls is ordered. |
59 | */ |
65 | */ |
60 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
66 | int gettimeofday(struct timeval *tv, struct timezone *tz) |
61 | { |
67 | { |
62 | void *mapping; |
68 | void *mapping; |
63 | sysarg_t s1, s2; |
69 | sysarg_t s1, s2; |
64 | sysarg_t rights; |
70 | sysarg_t rights; |
65 | int res; |
71 | int res; |
66 | 72 | ||
67 | if (!ktime) { |
73 | if (!ktime) { |
68 | mapping = as_get_mappable_page(PAGE_SIZE); |
74 | mapping = as_get_mappable_page(PAGE_SIZE); |
69 | /* Get the mapping of kernel clock */ |
75 | /* Get the mapping of kernel clock */ |
70 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
76 | res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
71 | mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, |
77 | mapping, PAGE_SIZE, SERVICE_MEM_REALTIME, |
72 | NULL,&rights,NULL); |
78 | NULL,&rights,NULL); |
73 | if (res) { |
79 | if (res) { |
74 | printf("Failed to initialize timeofday memarea\n"); |
80 | printf("Failed to initialize timeofday memarea\n"); |
75 | _exit(1); |
81 | _exit(1); |
76 | } |
82 | } |
77 | if (! (rights & AS_AREA_READ)) { |
83 | if (! (rights & AS_AREA_READ)) { |
78 | printf("Received bad rights on time area: %X\n", |
84 | printf("Received bad rights on time area: %X\n", |
79 | rights); |
85 | rights); |
80 | as_area_destroy(mapping); |
86 | as_area_destroy(mapping); |
81 | _exit(1); |
87 | _exit(1); |
82 | } |
88 | } |
83 | ktime = mapping; |
89 | ktime = mapping; |
84 | } |
90 | } |
85 | if (tz) { |
91 | if (tz) { |
86 | tz->tz_minuteswest = 0; |
92 | tz->tz_minuteswest = 0; |
87 | tz->tz_dsttime = DST_NONE; |
93 | tz->tz_dsttime = DST_NONE; |
88 | } |
94 | } |
89 | 95 | ||
90 | s2 = ktime->seconds2; |
96 | s2 = ktime->seconds2; |
91 | read_barrier(); |
97 | read_barrier(); |
92 | tv->tv_usec = ktime->useconds; |
98 | tv->tv_usec = ktime->useconds; |
93 | read_barrier(); |
99 | read_barrier(); |
94 | s1 = ktime->seconds1; |
100 | s1 = ktime->seconds1; |
95 | if (s1 != s2) { |
101 | if (s1 != s2) { |
96 | tv->tv_usec = 0; |
102 | tv->tv_usec = 0; |
97 | tv->tv_sec = s1 > s2 ? s1 : s2; |
103 | tv->tv_sec = s1 > s2 ? s1 : s2; |
98 | } else |
104 | } else |
99 | tv->tv_sec = s1; |
105 | tv->tv_sec = s1; |
100 | 106 | ||
101 | return 0; |
107 | return 0; |
102 | } |
108 | } |
103 | 109 | ||
104 | /** Wait unconditionally for specified microseconds */ |
110 | /** Wait unconditionally for specified microseconds */ |
105 | void usleep(unsigned long usec) |
111 | void usleep(unsigned long usec) |
106 | { |
112 | { |
107 | atomic_t futex = FUTEX_INITIALIZER; |
113 | atomic_t futex = FUTEX_INITIALIZER; |
108 | 114 | ||
109 | futex_initialize(&futex,0); |
115 | futex_initialize(&futex,0); |
110 | futex_down_timeout(&futex, usec, 0); |
116 | futex_down_timeout(&futex, usec, 0); |
111 | } |
117 | } |
- | 118 | ||
- | 119 | ||
- | 120 | /** @} |
|
- | 121 | */ |
|
- | 122 | ||
- | 123 | ||
112 | 124 |