| 0,0 → 1,96 |
|---|
| /* |
| * Copyright (C) 2006 Ondrej Palkovsky |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <time.h> |
| #include <unistd.h> |
| #include <ipc/ipc.h> |
| #include <stdio.h> |
| #include <arch/barrier.h> |
| |
| #include <sysinfo.h> |
| #include <as.h> |
| #include <ddi.h> |
| |
| /* Pointers to public variables with time */ |
| struct { |
| volatile sysarg_t seconds; |
| volatile sysarg_t useconds; |
| volatile sysarg_t useconds2; |
| } *ktime = NULL; |
| |
| |
| /** POSIX gettimeofday |
| * |
| * The time variables are memory mapped(RO) from kernel, which updates |
| * them periodically. As it is impossible to read 2 values atomically, we |
| * use a trick: First read a seconds, then read microseconds, then |
| * read seconds again. If a second elapsed in the meantime, read |
| * useconds again. This provides assurance, that at least the |
| * sequence of subsequent gettimeofday calls is ordered. |
| */ |
| #define TMAREA (100*1024*1024) |
| int gettimeofday(struct timeval *tv, struct timezone *tz) |
| { |
| void *mapping; |
| sysarg_t seconds,useconds; |
| sysarg_t t1; |
| int res; |
| |
| if (!ktime) { |
| /* TODO: specify better, where to map the area */ |
| /* Get the mapping of kernel clock */ |
| res = ipc_call_sync_3(PHONE_NS, IPC_M_AS_AREA_RECV, |
| TMAREA, |
| PAGE_SIZE, |
| AS_AREA_READ | AS_AREA_CACHEABLE, |
| &t1,&t1,&t1); |
| if (res) { |
| printf("Failed to initialize timeofday memarea\n"); |
| _exit(1); |
| } |
| ktime = (void *) (TMAREA); |
| } |
| tz->tz_minuteswest = 0; |
| tz->tz_dsttime = DST_NONE; |
| retry: |
| seconds = ktime->seconds; |
| read_barrier(); |
| tv->tv_usec = ktime->useconds; |
| read_barrier(); |
| tv->tv_sec = ktime->seconds; |
| if (tv->tv_usec == 0 && seconds == tv->tv_sec && |
| ktime->useconds2 != 0) { |
| read_barrier(); |
| goto retry; |
| } |
| |
| if (seconds != tv->tv_sec) |
| tv->tv_usec = ktime->useconds; |
| |
| return 0; |
| } |