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1435 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1719 decky 29
/** @addtogroup libc
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 * @{
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 */
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/** @file
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 */
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#include <sys/time.h>
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#include <unistd.h>
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#include <ipc/ipc.h>
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#include <stdio.h>
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#include <arch/barrier.h>
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#include <unistd.h>
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#include <atomic.h>
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#include <futex.h>
2015 jermar 43
#include <sysinfo.h>
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#include <ipc/services.h>
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#include <sysinfo.h>
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#include <as.h>
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#include <ddi.h>
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/* Pointers to public variables with time */
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struct {
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    volatile sysarg_t seconds1;
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    volatile sysarg_t useconds;
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    volatile sysarg_t seconds2;
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} *ktime = NULL;
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/** Add microseconds to given timeval.
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 *
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 * @param tv        Destination timeval.
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 * @param usecs     Number of microseconds to add.
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 */
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void tv_add(struct timeval *tv, suseconds_t usecs)
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{
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    tv->tv_sec += usecs / 1000000;
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    tv->tv_usec += usecs % 1000000;
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    if (tv->tv_usec > 1000000) {
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        tv->tv_sec++;
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        tv->tv_usec -= 1000000;
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    }
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}
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/** Subtract two timevals.
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 *
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 * @param tv1       First timeval.
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 * @param tv2       Second timeval.
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 *
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 * @return      Return difference between tv1 and tv2 (tv1 - tv2) in
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 *          microseconds.
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 */
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suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
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{
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    suseconds_t result;
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    result = tv1->tv_usec - tv2->tv_usec;
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    result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
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    return result;
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}
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/** Decide if one timeval is greater than the other.
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 *
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 * @param t1        First timeval.
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 * @param t2        Second timeval.
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 *
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 * @return      Return true tv1 is greater than tv2. Otherwise return
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 *          false.
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 */
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int tv_gt(struct timeval *tv1, struct timeval *tv2)
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{
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    if (tv1->tv_sec > tv2->tv_sec)
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        return 1;
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    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
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        return 1;
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    return 0;
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}
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/** Decide if one timeval is greater than or equal to the other.
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 *
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 * @param tv1       First timeval.
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 * @param tv2       Second timeval.
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 *
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 * @return      Return true if tv1 is greater than or equal to tv2.
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 *          Otherwise return false.
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 */
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int tv_gteq(struct timeval *tv1, struct timeval *tv2)
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{
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    if (tv1->tv_sec > tv2->tv_sec)
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        return 1;
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    if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
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        return 1;
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    return 0;
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}
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/** POSIX gettimeofday
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 *
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 * The time variables are memory mapped(RO) from kernel, which updates
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 * them periodically. As it is impossible to read 2 values atomically, we
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 * use a trick: First read a seconds, then read microseconds, then
1701 palkovsky 130
 * read seconds again. If a second elapsed in the meantime, set it to zero.
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 * This provides assurance, that at least the
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 * sequence of subsequent gettimeofday calls is ordered.
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 */
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int gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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    void *mapping;
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    sysarg_t s1, s2;
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    int rights;
1435 palkovsky 139
    int res;
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    if (!ktime) {
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        mapping = as_get_mappable_page(PAGE_SIZE);
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        /* Get the mapping of kernel clock */
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        res = ipc_share_in_start_1_1(PHONE_NS, mapping, PAGE_SIZE,
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            SERVICE_MEM_REALTIME, &rights);
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        if (res) {
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            printf("Failed to initialize timeofday memarea\n");
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            printf("Address was 0x%x\n", (unsigned)mapping);
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            _exit(1);
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        }
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        if (!(rights & AS_AREA_READ)) {
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            printf("Received bad rights on time area: %X\n",
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                rights);
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            as_area_destroy(mapping);
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            _exit(1);
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        }
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        ktime = mapping;
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    }
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    if (tz) {
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        tz->tz_minuteswest = 0;
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        tz->tz_dsttime = DST_NONE;
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    }
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    s2 = ktime->seconds2;
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    read_barrier();
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    tv->tv_usec = ktime->useconds;
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    read_barrier();
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    s1 = ktime->seconds1;
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    if (s1 != s2) {
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        tv->tv_usec = 0;
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        tv->tv_sec = s1 > s2 ? s1 : s2;
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    } else
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        tv->tv_sec = s1;
1435 palkovsky 174
 
175
    return 0;
176
}
1452 palkovsky 177
 
2564 jermar 178
time_t time(time_t *tloc)
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{
180
    struct timeval tv;
181
 
182
    if (gettimeofday(&tv, NULL))
183
        return (time_t) -1;
184
    if (tloc)
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        *tloc = tv.tv_sec;
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    return tv.tv_sec;
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}
188
 
2188 decky 189
/** Wait unconditionally for specified number of microseconds */
2616 jermar 190
int usleep(unsigned long usec)
1452 palkovsky 191
{
192
    atomic_t futex = FUTEX_INITIALIZER;
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2188 decky 194
    futex_initialize(&futex, 0);
1452 palkovsky 195
    futex_down_timeout(&futex, usec, 0);
2616 jermar 196
    return 0;
1452 palkovsky 197
}
1653 cejka 198
 
2188 decky 199
/** Wait unconditionally for specified number of seconds */
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unsigned int sleep(unsigned int seconds)
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{
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    atomic_t futex = FUTEX_INITIALIZER;
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204
    futex_initialize(&futex, 0);
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206
    /* Sleep in 1000 second steps to support
207
       full argument range */
208
    while (seconds > 0) {
209
        unsigned int period = (seconds > 1000) ? 1000 : seconds;
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211
        futex_down_timeout(&futex, period * 1000000, 0);
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        seconds -= period;
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    }
2616 jermar 214
    return 0;
2188 decky 215
}
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1719 decky 217
/** @}
1653 cejka 218
 */