diff options
author | Jennifer Averett <jennifer.averett@oarcorp.com> | 2012-04-05 10:00:36 -0500 |
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committer | Jennifer Averett <jennifer.averett@oarcorp.com> | 2012-04-05 10:01:55 -0500 |
commit | b2e05ef3e2dabcfb87e137f987c8cc753475c7c4 (patch) | |
tree | 4cc99a98f0e2bb7a219c572654302d0940e9ea19 /freebsd/kern/kern_time.c | |
parent | link01 - Add list of undefined symbols (diff) | |
download | rtems-libbsd-b2e05ef3e2dabcfb87e137f987c8cc753475c7c4.tar.bz2 |
Added ratecheck methods as part of RealTek Nic integration.
Diffstat (limited to 'freebsd/kern/kern_time.c')
-rw-r--r-- | freebsd/kern/kern_time.c | 1512 |
1 files changed, 1512 insertions, 0 deletions
diff --git a/freebsd/kern/kern_time.c b/freebsd/kern/kern_time.c new file mode 100644 index 00000000..f1919d76 --- /dev/null +++ b/freebsd/kern/kern_time.c @@ -0,0 +1,1512 @@ +#include <freebsd/machine/rtems-bsd-config.h> + +/*- + * Copyright (c) 1982, 1986, 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. + * + * @(#)kern_time.c 8.1 (Berkeley) 6/10/93 + */ + +#include <freebsd/sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <freebsd/sys/param.h> +#include <freebsd/sys/systm.h> +#include <freebsd/sys/limits.h> +#ifndef __rtems__ +#include <freebsd/sys/clock.h> +#endif /* __rtems__ */ +#include <freebsd/sys/lock.h> +#include <freebsd/sys/mutex.h> +#include <freebsd/sys/sysproto.h> +#include <freebsd/sys/eventhandler.h> +#include <freebsd/sys/resourcevar.h> +#include <freebsd/sys/signalvar.h> +#include <freebsd/sys/kernel.h> +#include <freebsd/sys/syscallsubr.h> +#include <freebsd/sys/sysctl.h> +#include <freebsd/sys/sysent.h> +#include <freebsd/sys/priv.h> +#include <freebsd/sys/proc.h> +#ifndef __rtems__ +#include <freebsd/sys/posix4.h> +#include <freebsd/sys/time.h> +#include <freebsd/sys/timers.h> +#include <freebsd/sys/timetc.h> +#include <freebsd/sys/vnode.h> + +#include <freebsd/vm/vm.h> +#include <freebsd/vm/vm_extern.h> + +#define MAX_CLOCKS (CLOCK_MONOTONIC+1) + +static struct kclock posix_clocks[MAX_CLOCKS]; +static uma_zone_t itimer_zone = NULL; + +/* + * Time of day and interval timer support. + * + * These routines provide the kernel entry points to get and set + * the time-of-day and per-process interval timers. Subroutines + * here provide support for adding and subtracting timeval structures + * and decrementing interval timers, optionally reloading the interval + * timers when they expire. + */ + +static int settime(struct thread *, struct timeval *); +#endif /* __rtems__ */ +static void timevalfix(struct timeval *); + +#ifndef __rtems__ +static void itimer_start(void); +static int itimer_init(void *, int, int); +static void itimer_fini(void *, int); +static void itimer_enter(struct itimer *); +static void itimer_leave(struct itimer *); +static struct itimer *itimer_find(struct proc *, int); +static void itimers_alloc(struct proc *); +static void itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp); +static void itimers_event_hook_exit(void *arg, struct proc *p); +static int realtimer_create(struct itimer *); +static int realtimer_gettime(struct itimer *, struct itimerspec *); +static int realtimer_settime(struct itimer *, int, + struct itimerspec *, struct itimerspec *); +static int realtimer_delete(struct itimer *); +static void realtimer_clocktime(clockid_t, struct timespec *); +static void realtimer_expire(void *); +static int kern_timer_create(struct thread *, clockid_t, + struct sigevent *, int *, int); +static int kern_timer_delete(struct thread *, int); + +int register_posix_clock(int, struct kclock *); +void itimer_fire(struct itimer *it); +int itimespecfix(struct timespec *ts); + +#define CLOCK_CALL(clock, call, arglist) \ + ((*posix_clocks[clock].call) arglist) + +SYSINIT(posix_timer, SI_SUB_P1003_1B, SI_ORDER_FIRST+4, itimer_start, NULL); + + +static int +settime(struct thread *td, struct timeval *tv) +{ + struct timeval delta, tv1, tv2; + static struct timeval maxtime, laststep; + struct timespec ts; + int s; + + s = splclock(); + microtime(&tv1); + delta = *tv; + timevalsub(&delta, &tv1); + + /* + * If the system is secure, we do not allow the time to be + * set to a value earlier than 1 second less than the highest + * time we have yet seen. The worst a miscreant can do in + * this circumstance is "freeze" time. He couldn't go + * back to the past. + * + * We similarly do not allow the clock to be stepped more + * than one second, nor more than once per second. This allows + * a miscreant to make the clock march double-time, but no worse. + */ + if (securelevel_gt(td->td_ucred, 1) != 0) { + if (delta.tv_sec < 0 || delta.tv_usec < 0) { + /* + * Update maxtime to latest time we've seen. + */ + if (tv1.tv_sec > maxtime.tv_sec) + maxtime = tv1; + tv2 = *tv; + timevalsub(&tv2, &maxtime); + if (tv2.tv_sec < -1) { + tv->tv_sec = maxtime.tv_sec - 1; + printf("Time adjustment clamped to -1 second\n"); + } + } else { + if (tv1.tv_sec == laststep.tv_sec) { + splx(s); + return (EPERM); + } + if (delta.tv_sec > 1) { + tv->tv_sec = tv1.tv_sec + 1; + printf("Time adjustment clamped to +1 second\n"); + } + laststep = *tv; + } + } + + ts.tv_sec = tv->tv_sec; + ts.tv_nsec = tv->tv_usec * 1000; + mtx_lock(&Giant); + tc_setclock(&ts); + resettodr(); + mtx_unlock(&Giant); + return (0); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct clock_gettime_args { + clockid_t clock_id; + struct timespec *tp; +}; +#endif +/* ARGSUSED */ +int +clock_gettime(struct thread *td, struct clock_gettime_args *uap) +{ + struct timespec ats; + int error; + + error = kern_clock_gettime(td, uap->clock_id, &ats); + if (error == 0) + error = copyout(&ats, uap->tp, sizeof(ats)); + + return (error); +} + +int +kern_clock_gettime(struct thread *td, clockid_t clock_id, struct timespec *ats) +{ + struct timeval sys, user; + struct proc *p; + uint64_t runtime, curtime, switchtime; + + p = td->td_proc; + switch (clock_id) { + case CLOCK_REALTIME: /* Default to precise. */ + case CLOCK_REALTIME_PRECISE: + nanotime(ats); + break; + case CLOCK_REALTIME_FAST: + getnanotime(ats); + break; + case CLOCK_VIRTUAL: + PROC_LOCK(p); + PROC_SLOCK(p); + calcru(p, &user, &sys); + PROC_SUNLOCK(p); + PROC_UNLOCK(p); + TIMEVAL_TO_TIMESPEC(&user, ats); + break; + case CLOCK_PROF: + PROC_LOCK(p); + PROC_SLOCK(p); + calcru(p, &user, &sys); + PROC_SUNLOCK(p); + PROC_UNLOCK(p); + timevaladd(&user, &sys); + TIMEVAL_TO_TIMESPEC(&user, ats); + break; + case CLOCK_MONOTONIC: /* Default to precise. */ + case CLOCK_MONOTONIC_PRECISE: + case CLOCK_UPTIME: + case CLOCK_UPTIME_PRECISE: + nanouptime(ats); + break; + case CLOCK_UPTIME_FAST: + case CLOCK_MONOTONIC_FAST: + getnanouptime(ats); + break; + case CLOCK_SECOND: + ats->tv_sec = time_second; + ats->tv_nsec = 0; + break; + case CLOCK_THREAD_CPUTIME_ID: + critical_enter(); + switchtime = PCPU_GET(switchtime); + curtime = cpu_ticks(); + runtime = td->td_runtime; + critical_exit(); + runtime = cputick2usec(runtime + curtime - switchtime); + ats->tv_sec = runtime / 1000000; + ats->tv_nsec = runtime % 1000000 * 1000; + break; + default: + return (EINVAL); + } + return (0); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct clock_settime_args { + clockid_t clock_id; + const struct timespec *tp; +}; +#endif +/* ARGSUSED */ +int +clock_settime(struct thread *td, struct clock_settime_args *uap) +{ + struct timespec ats; + int error; + + if ((error = copyin(uap->tp, &ats, sizeof(ats))) != 0) + return (error); + return (kern_clock_settime(td, uap->clock_id, &ats)); +} + +int +kern_clock_settime(struct thread *td, clockid_t clock_id, struct timespec *ats) +{ + struct timeval atv; + int error; + + if ((error = priv_check(td, PRIV_CLOCK_SETTIME)) != 0) + return (error); + if (clock_id != CLOCK_REALTIME) + return (EINVAL); + if (ats->tv_nsec < 0 || ats->tv_nsec >= 1000000000) + return (EINVAL); + /* XXX Don't convert nsec->usec and back */ + TIMESPEC_TO_TIMEVAL(&atv, ats); + error = settime(td, &atv); + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct clock_getres_args { + clockid_t clock_id; + struct timespec *tp; +}; +#endif +int +clock_getres(struct thread *td, struct clock_getres_args *uap) +{ + struct timespec ts; + int error; + + if (uap->tp == NULL) + return (0); + + error = kern_clock_getres(td, uap->clock_id, &ts); + if (error == 0) + error = copyout(&ts, uap->tp, sizeof(ts)); + return (error); +} + +int +kern_clock_getres(struct thread *td, clockid_t clock_id, struct timespec *ts) +{ + + ts->tv_sec = 0; + switch (clock_id) { + case CLOCK_REALTIME: + case CLOCK_REALTIME_FAST: + case CLOCK_REALTIME_PRECISE: + case CLOCK_MONOTONIC: + case CLOCK_MONOTONIC_FAST: + case CLOCK_MONOTONIC_PRECISE: + case CLOCK_UPTIME: + case CLOCK_UPTIME_FAST: + case CLOCK_UPTIME_PRECISE: + /* + * Round up the result of the division cheaply by adding 1. + * Rounding up is especially important if rounding down + * would give 0. Perfect rounding is unimportant. + */ + ts->tv_nsec = 1000000000 / tc_getfrequency() + 1; + break; + case CLOCK_VIRTUAL: + case CLOCK_PROF: + /* Accurately round up here because we can do so cheaply. */ + ts->tv_nsec = (1000000000 + hz - 1) / hz; + break; + case CLOCK_SECOND: + ts->tv_sec = 1; + ts->tv_nsec = 0; + break; + case CLOCK_THREAD_CPUTIME_ID: + /* sync with cputick2usec */ + ts->tv_nsec = 1000000 / cpu_tickrate(); + if (ts->tv_nsec == 0) + ts->tv_nsec = 1000; + break; + default: + return (EINVAL); + } + return (0); +} + +static int nanowait; + +int +kern_nanosleep(struct thread *td, struct timespec *rqt, struct timespec *rmt) +{ + struct timespec ts, ts2, ts3; + struct timeval tv; + int error; + + if (rqt->tv_nsec < 0 || rqt->tv_nsec >= 1000000000) + return (EINVAL); + if (rqt->tv_sec < 0 || (rqt->tv_sec == 0 && rqt->tv_nsec == 0)) + return (0); + getnanouptime(&ts); + timespecadd(&ts, rqt); + TIMESPEC_TO_TIMEVAL(&tv, rqt); + for (;;) { + error = tsleep(&nanowait, PWAIT | PCATCH, "nanslp", + tvtohz(&tv)); + getnanouptime(&ts2); + if (error != EWOULDBLOCK) { + if (error == ERESTART) + error = EINTR; + if (rmt != NULL) { + timespecsub(&ts, &ts2); + if (ts.tv_sec < 0) + timespecclear(&ts); + *rmt = ts; + } + return (error); + } + if (timespeccmp(&ts2, &ts, >=)) + return (0); + ts3 = ts; + timespecsub(&ts3, &ts2); + TIMESPEC_TO_TIMEVAL(&tv, &ts3); + } +} + +#ifndef _SYS_SYSPROTO_HH_ +struct nanosleep_args { + struct timespec *rqtp; + struct timespec *rmtp; +}; +#endif +/* ARGSUSED */ +int +nanosleep(struct thread *td, struct nanosleep_args *uap) +{ + struct timespec rmt, rqt; + int error; + + error = copyin(uap->rqtp, &rqt, sizeof(rqt)); + if (error) + return (error); + + if (uap->rmtp && + !useracc((caddr_t)uap->rmtp, sizeof(rmt), VM_PROT_WRITE)) + return (EFAULT); + error = kern_nanosleep(td, &rqt, &rmt); + if (error && uap->rmtp) { + int error2; + + error2 = copyout(&rmt, uap->rmtp, sizeof(rmt)); + if (error2) + error = error2; + } + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct gettimeofday_args { + struct timeval *tp; + struct timezone *tzp; +}; +#endif +/* ARGSUSED */ +int +gettimeofday(struct thread *td, struct gettimeofday_args *uap) +{ + struct timeval atv; + struct timezone rtz; + int error = 0; + + if (uap->tp) { + microtime(&atv); + error = copyout(&atv, uap->tp, sizeof (atv)); + } + if (error == 0 && uap->tzp != NULL) { + rtz.tz_minuteswest = tz_minuteswest; + rtz.tz_dsttime = tz_dsttime; + error = copyout(&rtz, uap->tzp, sizeof (rtz)); + } + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct settimeofday_args { + struct timeval *tv; + struct timezone *tzp; +}; +#endif +/* ARGSUSED */ +int +settimeofday(struct thread *td, struct settimeofday_args *uap) +{ + struct timeval atv, *tvp; + struct timezone atz, *tzp; + int error; + + if (uap->tv) { + error = copyin(uap->tv, &atv, sizeof(atv)); + if (error) + return (error); + tvp = &atv; + } else + tvp = NULL; + if (uap->tzp) { + error = copyin(uap->tzp, &atz, sizeof(atz)); + if (error) + return (error); + tzp = &atz; + } else + tzp = NULL; + return (kern_settimeofday(td, tvp, tzp)); +} + +int +kern_settimeofday(struct thread *td, struct timeval *tv, struct timezone *tzp) +{ + int error; + + error = priv_check(td, PRIV_SETTIMEOFDAY); + if (error) + return (error); + /* Verify all parameters before changing time. */ + if (tv) { + if (tv->tv_usec < 0 || tv->tv_usec >= 1000000) + return (EINVAL); + error = settime(td, tv); + } + if (tzp && error == 0) { + tz_minuteswest = tzp->tz_minuteswest; + tz_dsttime = tzp->tz_dsttime; + } + return (error); +} + +/* + * Get value of an interval timer. The process virtual and profiling virtual + * time timers are kept in the p_stats area, since they can be swapped out. + * These are kept internally in the way they are specified externally: in + * time until they expire. + * + * The real time interval timer is kept in the process table slot for the + * process, and its value (it_value) is kept as an absolute time rather than + * as a delta, so that it is easy to keep periodic real-time signals from + * drifting. + * + * Virtual time timers are processed in the hardclock() routine of + * kern_clock.c. The real time timer is processed by a timeout routine, + * called from the softclock() routine. Since a callout may be delayed in + * real time due to interrupt processing in the system, it is possible for + * the real time timeout routine (realitexpire, given below), to be delayed + * in real time past when it is supposed to occur. It does not suffice, + * therefore, to reload the real timer .it_value from the real time timers + * .it_interval. Rather, we compute the next time in absolute time the timer + * should go off. + */ +#ifndef _SYS_SYSPROTO_HH_ +struct getitimer_args { + u_int which; + struct itimerval *itv; +}; +#endif +int +getitimer(struct thread *td, struct getitimer_args *uap) +{ + struct itimerval aitv; + int error; + + error = kern_getitimer(td, uap->which, &aitv); + if (error != 0) + return (error); + return (copyout(&aitv, uap->itv, sizeof (struct itimerval))); +} + +int +kern_getitimer(struct thread *td, u_int which, struct itimerval *aitv) +{ + struct proc *p = td->td_proc; + struct timeval ctv; + + if (which > ITIMER_PROF) + return (EINVAL); + + if (which == ITIMER_REAL) { + /* + * Convert from absolute to relative time in .it_value + * part of real time timer. If time for real time timer + * has passed return 0, else return difference between + * current time and time for the timer to go off. + */ + PROC_LOCK(p); + *aitv = p->p_realtimer; + PROC_UNLOCK(p); + if (timevalisset(&aitv->it_value)) { + getmicrouptime(&ctv); + if (timevalcmp(&aitv->it_value, &ctv, <)) + timevalclear(&aitv->it_value); + else + timevalsub(&aitv->it_value, &ctv); + } + } else { + PROC_SLOCK(p); + *aitv = p->p_stats->p_timer[which]; + PROC_SUNLOCK(p); + } + return (0); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct setitimer_args { + u_int which; + struct itimerval *itv, *oitv; +}; +#endif +int +setitimer(struct thread *td, struct setitimer_args *uap) +{ + struct itimerval aitv, oitv; + int error; + + if (uap->itv == NULL) { + uap->itv = uap->oitv; + return (getitimer(td, (struct getitimer_args *)uap)); + } + + if ((error = copyin(uap->itv, &aitv, sizeof(struct itimerval)))) + return (error); + error = kern_setitimer(td, uap->which, &aitv, &oitv); + if (error != 0 || uap->oitv == NULL) + return (error); + return (copyout(&oitv, uap->oitv, sizeof(struct itimerval))); +} + +int +kern_setitimer(struct thread *td, u_int which, struct itimerval *aitv, + struct itimerval *oitv) +{ + struct proc *p = td->td_proc; + struct timeval ctv; + + if (aitv == NULL) + return (kern_getitimer(td, which, oitv)); + + if (which > ITIMER_PROF) + return (EINVAL); + if (itimerfix(&aitv->it_value)) + return (EINVAL); + if (!timevalisset(&aitv->it_value)) + timevalclear(&aitv->it_interval); + else if (itimerfix(&aitv->it_interval)) + return (EINVAL); + + if (which == ITIMER_REAL) { + PROC_LOCK(p); + if (timevalisset(&p->p_realtimer.it_value)) + callout_stop(&p->p_itcallout); + getmicrouptime(&ctv); + if (timevalisset(&aitv->it_value)) { + callout_reset(&p->p_itcallout, tvtohz(&aitv->it_value), + realitexpire, p); + timevaladd(&aitv->it_value, &ctv); + } + *oitv = p->p_realtimer; + p->p_realtimer = *aitv; + PROC_UNLOCK(p); + if (timevalisset(&oitv->it_value)) { + if (timevalcmp(&oitv->it_value, &ctv, <)) + timevalclear(&oitv->it_value); + else + timevalsub(&oitv->it_value, &ctv); + } + } else { + PROC_SLOCK(p); + *oitv = p->p_stats->p_timer[which]; + p->p_stats->p_timer[which] = *aitv; + PROC_SUNLOCK(p); + } + return (0); +} + +/* + * Real interval timer expired: + * send process whose timer expired an alarm signal. + * If time is not set up to reload, then just return. + * Else compute next time timer should go off which is > current time. + * This is where delay in processing this timeout causes multiple + * SIGALRM calls to be compressed into one. + * tvtohz() always adds 1 to allow for the time until the next clock + * interrupt being strictly less than 1 clock tick, but we don't want + * that here since we want to appear to be in sync with the clock + * interrupt even when we're delayed. + */ +void +realitexpire(void *arg) +{ + struct proc *p; + struct timeval ctv, ntv; + + p = (struct proc *)arg; + PROC_LOCK(p); + psignal(p, SIGALRM); + if (!timevalisset(&p->p_realtimer.it_interval)) { + timevalclear(&p->p_realtimer.it_value); + if (p->p_flag & P_WEXIT) + wakeup(&p->p_itcallout); + PROC_UNLOCK(p); + return; + } + for (;;) { + timevaladd(&p->p_realtimer.it_value, + &p->p_realtimer.it_interval); + getmicrouptime(&ctv); + if (timevalcmp(&p->p_realtimer.it_value, &ctv, >)) { + ntv = p->p_realtimer.it_value; + timevalsub(&ntv, &ctv); + callout_reset(&p->p_itcallout, tvtohz(&ntv) - 1, + realitexpire, p); + PROC_UNLOCK(p); + return; + } + } + /*NOTREACHED*/ +} + +/* + * Check that a proposed value to load into the .it_value or + * .it_interval part of an interval timer is acceptable, and + * fix it to have at least minimal value (i.e. if it is less + * than the resolution of the clock, round it up.) + */ +int +itimerfix(struct timeval *tv) +{ + + if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000) + return (EINVAL); + if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick) + tv->tv_usec = tick; + return (0); +} + +/* + * Decrement an interval timer by a specified number + * of microseconds, which must be less than a second, + * i.e. < 1000000. If the timer expires, then reload + * it. In this case, carry over (usec - old value) to + * reduce the value reloaded into the timer so that + * the timer does not drift. This routine assumes + * that it is called in a context where the timers + * on which it is operating cannot change in value. + */ +int +itimerdecr(struct itimerval *itp, int usec) +{ + + if (itp->it_value.tv_usec < usec) { + if (itp->it_value.tv_sec == 0) { + /* expired, and already in next interval */ + usec -= itp->it_value.tv_usec; + goto expire; + } + itp->it_value.tv_usec += 1000000; + itp->it_value.tv_sec--; + } + itp->it_value.tv_usec -= usec; + usec = 0; + if (timevalisset(&itp->it_value)) + return (1); + /* expired, exactly at end of interval */ +expire: + if (timevalisset(&itp->it_interval)) { + itp->it_value = itp->it_interval; + itp->it_value.tv_usec -= usec; + if (itp->it_value.tv_usec < 0) { + itp->it_value.tv_usec += 1000000; + itp->it_value.tv_sec--; + } + } else + itp->it_value.tv_usec = 0; /* sec is already 0 */ + return (0); +} + +/* + * Add and subtract routines for timevals. + * N.B.: subtract routine doesn't deal with + * results which are before the beginning, + * it just gets very confused in this case. + * Caveat emptor. + */ +void +timevaladd(struct timeval *t1, const struct timeval *t2) +{ + + t1->tv_sec += t2->tv_sec; + t1->tv_usec += t2->tv_usec; + timevalfix(t1); +} +#endif /* __rtems__ */ + +void +timevalsub(struct timeval *t1, const struct timeval *t2) +{ + + t1->tv_sec -= t2->tv_sec; + t1->tv_usec -= t2->tv_usec; + timevalfix(t1); +} + +static void +timevalfix(struct timeval *t1) +{ + + if (t1->tv_usec < 0) { + t1->tv_sec--; + t1->tv_usec += 1000000; + } + if (t1->tv_usec >= 1000000) { + t1->tv_sec++; + t1->tv_usec -= 1000000; + } +} + +/* + * ratecheck(): simple time-based rate-limit checking. + */ +int +ratecheck(struct timeval *lasttime, const struct timeval *mininterval) +{ + struct timeval tv, delta; + int rv = 0; + + getmicrouptime(&tv); /* NB: 10ms precision */ + delta = tv; + timevalsub(&delta, lasttime); + + /* + * check for 0,0 is so that the message will be seen at least once, + * even if interval is huge. + */ + if (timevalcmp(&delta, mininterval, >=) || + (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) { + *lasttime = tv; + rv = 1; + } + + return (rv); +} + +/* + * ppsratecheck(): packets (or events) per second limitation. + * + * Return 0 if the limit is to be enforced (e.g. the caller + * should drop a packet because of the rate limitation). + * + * maxpps of 0 always causes zero to be returned. maxpps of -1 + * always causes 1 to be returned; this effectively defeats rate + * limiting. + * + * Note that we maintain the struct timeval for compatibility + * with other bsd systems. We reuse the storage and just monitor + * clock ticks for minimal overhead. + */ +int +ppsratecheck(struct timeval *lasttime, int *curpps, int maxpps) +{ + int now; + + /* + * Reset the last time and counter if this is the first call + * or more than a second has passed since the last update of + * lasttime. + */ + now = ticks; + if (lasttime->tv_sec == 0 || (u_int)(now - lasttime->tv_sec) >= hz) { + lasttime->tv_sec = now; + *curpps = 1; + return (maxpps != 0); + } else { + (*curpps)++; /* NB: ignore potential overflow */ + return (maxpps < 0 || *curpps < maxpps); + } +} + +#ifndef __rtems__ +static void +itimer_start(void) +{ + struct kclock rt_clock = { + .timer_create = realtimer_create, + .timer_delete = realtimer_delete, + .timer_settime = realtimer_settime, + .timer_gettime = realtimer_gettime, + .event_hook = NULL + }; + + itimer_zone = uma_zcreate("itimer", sizeof(struct itimer), + NULL, NULL, itimer_init, itimer_fini, UMA_ALIGN_PTR, 0); + register_posix_clock(CLOCK_REALTIME, &rt_clock); + register_posix_clock(CLOCK_MONOTONIC, &rt_clock); + p31b_setcfg(CTL_P1003_1B_TIMERS, 200112L); + p31b_setcfg(CTL_P1003_1B_DELAYTIMER_MAX, INT_MAX); + p31b_setcfg(CTL_P1003_1B_TIMER_MAX, TIMER_MAX); + EVENTHANDLER_REGISTER(process_exit, itimers_event_hook_exit, + (void *)ITIMER_EV_EXIT, EVENTHANDLER_PRI_ANY); + EVENTHANDLER_REGISTER(process_exec, itimers_event_hook_exec, + (void *)ITIMER_EV_EXEC, EVENTHANDLER_PRI_ANY); +} + +int +register_posix_clock(int clockid, struct kclock *clk) +{ + if ((unsigned)clockid >= MAX_CLOCKS) { + printf("%s: invalid clockid\n", __func__); + return (0); + } + posix_clocks[clockid] = *clk; + return (1); +} + +static int +itimer_init(void *mem, int size, int flags) +{ + struct itimer *it; + + it = (struct itimer *)mem; + mtx_init(&it->it_mtx, "itimer lock", NULL, MTX_DEF); + return (0); +} + +static void +itimer_fini(void *mem, int size) +{ + struct itimer *it; + + it = (struct itimer *)mem; + mtx_destroy(&it->it_mtx); +} + +static void +itimer_enter(struct itimer *it) +{ + + mtx_assert(&it->it_mtx, MA_OWNED); + it->it_usecount++; +} + +static void +itimer_leave(struct itimer *it) +{ + + mtx_assert(&it->it_mtx, MA_OWNED); + KASSERT(it->it_usecount > 0, ("invalid it_usecount")); + + if (--it->it_usecount == 0 && (it->it_flags & ITF_WANTED) != 0) + wakeup(it); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct ktimer_create_args { + clockid_t clock_id; + struct sigevent * evp; + int * timerid; +}; +#endif +int +ktimer_create(struct thread *td, struct ktimer_create_args *uap) +{ + struct sigevent *evp1, ev; + int id; + int error; + + if (uap->evp != NULL) { + error = copyin(uap->evp, &ev, sizeof(ev)); + if (error != 0) + return (error); + evp1 = &ev; + } else + evp1 = NULL; + + error = kern_timer_create(td, uap->clock_id, evp1, &id, -1); + + if (error == 0) { + error = copyout(&id, uap->timerid, sizeof(int)); + if (error != 0) + kern_timer_delete(td, id); + } + return (error); +} + +static int +kern_timer_create(struct thread *td, clockid_t clock_id, + struct sigevent *evp, int *timerid, int preset_id) +{ + struct proc *p = td->td_proc; + struct itimer *it; + int id; + int error; + + if (clock_id < 0 || clock_id >= MAX_CLOCKS) + return (EINVAL); + + if (posix_clocks[clock_id].timer_create == NULL) + return (EINVAL); + + if (evp != NULL) { + if (evp->sigev_notify != SIGEV_NONE && + evp->sigev_notify != SIGEV_SIGNAL && + evp->sigev_notify != SIGEV_THREAD_ID) + return (EINVAL); + if ((evp->sigev_notify == SIGEV_SIGNAL || + evp->sigev_notify == SIGEV_THREAD_ID) && + !_SIG_VALID(evp->sigev_signo)) + return (EINVAL); + } + + if (p->p_itimers == NULL) + itimers_alloc(p); + + it = uma_zalloc(itimer_zone, M_WAITOK); + it->it_flags = 0; + it->it_usecount = 0; + it->it_active = 0; + timespecclear(&it->it_time.it_value); + timespecclear(&it->it_time.it_interval); + it->it_overrun = 0; + it->it_overrun_last = 0; + it->it_clockid = clock_id; + it->it_timerid = -1; + it->it_proc = p; + ksiginfo_init(&it->it_ksi); + it->it_ksi.ksi_flags |= KSI_INS | KSI_EXT; + error = CLOCK_CALL(clock_id, timer_create, (it)); + if (error != 0) + goto out; + + PROC_LOCK(p); + if (preset_id != -1) { + KASSERT(preset_id >= 0 && preset_id < 3, ("invalid preset_id")); + id = preset_id; + if (p->p_itimers->its_timers[id] != NULL) { + PROC_UNLOCK(p); + error = 0; + goto out; + } + } else { + /* + * Find a free timer slot, skipping those reserved + * for setitimer(). + */ + for (id = 3; id < TIMER_MAX; id++) + if (p->p_itimers->its_timers[id] == NULL) + break; + if (id == TIMER_MAX) { + PROC_UNLOCK(p); + error = EAGAIN; + goto out; + } + } + it->it_timerid = id; + p->p_itimers->its_timers[id] = it; + if (evp != NULL) + it->it_sigev = *evp; + else { + it->it_sigev.sigev_notify = SIGEV_SIGNAL; + switch (clock_id) { + default: + case CLOCK_REALTIME: + it->it_sigev.sigev_signo = SIGALRM; + break; + case CLOCK_VIRTUAL: + it->it_sigev.sigev_signo = SIGVTALRM; + break; + case CLOCK_PROF: + it->it_sigev.sigev_signo = SIGPROF; + break; + } + it->it_sigev.sigev_value.sival_int = id; + } + + if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || + it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { + it->it_ksi.ksi_signo = it->it_sigev.sigev_signo; + it->it_ksi.ksi_code = SI_TIMER; + it->it_ksi.ksi_value = it->it_sigev.sigev_value; + it->it_ksi.ksi_timerid = id; + } + PROC_UNLOCK(p); + *timerid = id; + return (0); + +out: + ITIMER_LOCK(it); + CLOCK_CALL(it->it_clockid, timer_delete, (it)); + ITIMER_UNLOCK(it); + uma_zfree(itimer_zone, it); + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct ktimer_delete_args { + int timerid; +}; +#endif +int +ktimer_delete(struct thread *td, struct ktimer_delete_args *uap) +{ + return (kern_timer_delete(td, uap->timerid)); +} + +static struct itimer * +itimer_find(struct proc *p, int timerid) +{ + struct itimer *it; + + PROC_LOCK_ASSERT(p, MA_OWNED); + if ((p->p_itimers == NULL) || + (timerid < 0) || (timerid >= TIMER_MAX) || + (it = p->p_itimers->its_timers[timerid]) == NULL) { + return (NULL); + } + ITIMER_LOCK(it); + if ((it->it_flags & ITF_DELETING) != 0) { + ITIMER_UNLOCK(it); + it = NULL; + } + return (it); +} + +static int +kern_timer_delete(struct thread *td, int timerid) +{ + struct proc *p = td->td_proc; + struct itimer *it; + + PROC_LOCK(p); + it = itimer_find(p, timerid); + if (it == NULL) { + PROC_UNLOCK(p); + return (EINVAL); + } + PROC_UNLOCK(p); + + it->it_flags |= ITF_DELETING; + while (it->it_usecount > 0) { + it->it_flags |= ITF_WANTED; + msleep(it, &it->it_mtx, PPAUSE, "itimer", 0); + } + it->it_flags &= ~ITF_WANTED; + CLOCK_CALL(it->it_clockid, timer_delete, (it)); + ITIMER_UNLOCK(it); + + PROC_LOCK(p); + if (KSI_ONQ(&it->it_ksi)) + sigqueue_take(&it->it_ksi); + p->p_itimers->its_timers[timerid] = NULL; + PROC_UNLOCK(p); + uma_zfree(itimer_zone, it); + return (0); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct ktimer_settime_args { + int timerid; + int flags; + const struct itimerspec * value; + struct itimerspec * ovalue; +}; +#endif +int +ktimer_settime(struct thread *td, struct ktimer_settime_args *uap) +{ + struct proc *p = td->td_proc; + struct itimer *it; + struct itimerspec val, oval, *ovalp; + int error; + + error = copyin(uap->value, &val, sizeof(val)); + if (error != 0) + return (error); + + if (uap->ovalue != NULL) + ovalp = &oval; + else + ovalp = NULL; + + PROC_LOCK(p); + if (uap->timerid < 3 || + (it = itimer_find(p, uap->timerid)) == NULL) { + PROC_UNLOCK(p); + error = EINVAL; + } else { + PROC_UNLOCK(p); + itimer_enter(it); + error = CLOCK_CALL(it->it_clockid, timer_settime, + (it, uap->flags, &val, ovalp)); + itimer_leave(it); + ITIMER_UNLOCK(it); + } + if (error == 0 && uap->ovalue != NULL) + error = copyout(ovalp, uap->ovalue, sizeof(*ovalp)); + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct ktimer_gettime_args { + int timerid; + struct itimerspec * value; +}; +#endif +int +ktimer_gettime(struct thread *td, struct ktimer_gettime_args *uap) +{ + struct proc *p = td->td_proc; + struct itimer *it; + struct itimerspec val; + int error; + + PROC_LOCK(p); + if (uap->timerid < 3 || + (it = itimer_find(p, uap->timerid)) == NULL) { + PROC_UNLOCK(p); + error = EINVAL; + } else { + PROC_UNLOCK(p); + itimer_enter(it); + error = CLOCK_CALL(it->it_clockid, timer_gettime, + (it, &val)); + itimer_leave(it); + ITIMER_UNLOCK(it); + } + if (error == 0) + error = copyout(&val, uap->value, sizeof(val)); + return (error); +} + +#ifndef _SYS_SYSPROTO_HH_ +struct timer_getoverrun_args { + int timerid; +}; +#endif +int +ktimer_getoverrun(struct thread *td, struct ktimer_getoverrun_args *uap) +{ + struct proc *p = td->td_proc; + struct itimer *it; + int error ; + + PROC_LOCK(p); + if (uap->timerid < 3 || + (it = itimer_find(p, uap->timerid)) == NULL) { + PROC_UNLOCK(p); + error = EINVAL; + } else { + td->td_retval[0] = it->it_overrun_last; + ITIMER_UNLOCK(it); + PROC_UNLOCK(p); + error = 0; + } + return (error); +} + +static int +realtimer_create(struct itimer *it) +{ + callout_init_mtx(&it->it_callout, &it->it_mtx, 0); + return (0); +} + +static int +realtimer_delete(struct itimer *it) +{ + mtx_assert(&it->it_mtx, MA_OWNED); + + /* + * clear timer's value and interval to tell realtimer_expire + * to not rearm the timer. + */ + timespecclear(&it->it_time.it_value); + timespecclear(&it->it_time.it_interval); + ITIMER_UNLOCK(it); + callout_drain(&it->it_callout); + ITIMER_LOCK(it); + return (0); +} + +static int +realtimer_gettime(struct itimer *it, struct itimerspec *ovalue) +{ + struct timespec cts; + + mtx_assert(&it->it_mtx, MA_OWNED); + + realtimer_clocktime(it->it_clockid, &cts); + *ovalue = it->it_time; + if (ovalue->it_value.tv_sec != 0 || ovalue->it_value.tv_nsec != 0) { + timespecsub(&ovalue->it_value, &cts); + if (ovalue->it_value.tv_sec < 0 || + (ovalue->it_value.tv_sec == 0 && + ovalue->it_value.tv_nsec == 0)) { + ovalue->it_value.tv_sec = 0; + ovalue->it_value.tv_nsec = 1; + } + } + return (0); +} + +static int +realtimer_settime(struct itimer *it, int flags, + struct itimerspec *value, struct itimerspec *ovalue) +{ + struct timespec cts, ts; + struct timeval tv; + struct itimerspec val; + + mtx_assert(&it->it_mtx, MA_OWNED); + + val = *value; + if (itimespecfix(&val.it_value)) + return (EINVAL); + + if (timespecisset(&val.it_value)) { + if (itimespecfix(&val.it_interval)) + return (EINVAL); + } else { + timespecclear(&val.it_interval); + } + + if (ovalue != NULL) + realtimer_gettime(it, ovalue); + + it->it_time = val; + if (timespecisset(&val.it_value)) { + realtimer_clocktime(it->it_clockid, &cts); + ts = val.it_value; + if ((flags & TIMER_ABSTIME) == 0) { + /* Convert to absolute time. */ + timespecadd(&it->it_time.it_value, &cts); + } else { + timespecsub(&ts, &cts); + /* + * We don't care if ts is negative, tztohz will + * fix it. + */ + } + TIMESPEC_TO_TIMEVAL(&tv, &ts); + callout_reset(&it->it_callout, tvtohz(&tv), + realtimer_expire, it); + } else { + callout_stop(&it->it_callout); + } + + return (0); +} + +static void +realtimer_clocktime(clockid_t id, struct timespec *ts) +{ + if (id == CLOCK_REALTIME) + getnanotime(ts); + else /* CLOCK_MONOTONIC */ + getnanouptime(ts); +} + +int +itimer_accept(struct proc *p, int timerid, ksiginfo_t *ksi) +{ + struct itimer *it; + + PROC_LOCK_ASSERT(p, MA_OWNED); + it = itimer_find(p, timerid); + if (it != NULL) { + ksi->ksi_overrun = it->it_overrun; + it->it_overrun_last = it->it_overrun; + it->it_overrun = 0; + ITIMER_UNLOCK(it); + return (0); + } + return (EINVAL); +} + +int +itimespecfix(struct timespec *ts) +{ + + if (ts->tv_sec < 0 || ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000) + return (EINVAL); + if (ts->tv_sec == 0 && ts->tv_nsec != 0 && ts->tv_nsec < tick * 1000) + ts->tv_nsec = tick * 1000; + return (0); +} + +/* Timeout callback for realtime timer */ +static void +realtimer_expire(void *arg) +{ + struct timespec cts, ts; + struct timeval tv; + struct itimer *it; + + it = (struct itimer *)arg; + + realtimer_clocktime(it->it_clockid, &cts); + /* Only fire if time is reached. */ + if (timespeccmp(&cts, &it->it_time.it_value, >=)) { + if (timespecisset(&it->it_time.it_interval)) { + timespecadd(&it->it_time.it_value, + &it->it_time.it_interval); + while (timespeccmp(&cts, &it->it_time.it_value, >=)) { + if (it->it_overrun < INT_MAX) + it->it_overrun++; + else + it->it_ksi.ksi_errno = ERANGE; + timespecadd(&it->it_time.it_value, + &it->it_time.it_interval); + } + } else { + /* single shot timer ? */ + timespecclear(&it->it_time.it_value); + } + if (timespecisset(&it->it_time.it_value)) { + ts = it->it_time.it_value; + timespecsub(&ts, &cts); + TIMESPEC_TO_TIMEVAL(&tv, &ts); + callout_reset(&it->it_callout, tvtohz(&tv), + realtimer_expire, it); + } + itimer_enter(it); + ITIMER_UNLOCK(it); + itimer_fire(it); + ITIMER_LOCK(it); + itimer_leave(it); + } else if (timespecisset(&it->it_time.it_value)) { + ts = it->it_time.it_value; + timespecsub(&ts, &cts); + TIMESPEC_TO_TIMEVAL(&tv, &ts); + callout_reset(&it->it_callout, tvtohz(&tv), realtimer_expire, + it); + } +} + +void +itimer_fire(struct itimer *it) +{ + struct proc *p = it->it_proc; + int ret; + + if (it->it_sigev.sigev_notify == SIGEV_SIGNAL || + it->it_sigev.sigev_notify == SIGEV_THREAD_ID) { + PROC_LOCK(p); + if (!KSI_ONQ(&it->it_ksi)) { + it->it_ksi.ksi_errno = 0; + ret = psignal_event(p, &it->it_sigev, &it->it_ksi); + if (__predict_false(ret != 0)) { + it->it_overrun++; + /* + * Broken userland code, thread went + * away, disarm the timer. + */ + if (ret == ESRCH) { + ITIMER_LOCK(it); + timespecclear(&it->it_time.it_value); + timespecclear(&it->it_time.it_interval); + callout_stop(&it->it_callout); + ITIMER_UNLOCK(it); + } + } + } else { + if (it->it_overrun < INT_MAX) + it->it_overrun++; + else + it->it_ksi.ksi_errno = ERANGE; + } + PROC_UNLOCK(p); + } +} + +static void +itimers_alloc(struct proc *p) +{ + struct itimers *its; + int i; + + its = malloc(sizeof (struct itimers), M_SUBPROC, M_WAITOK | M_ZERO); + LIST_INIT(&its->its_virtual); + LIST_INIT(&its->its_prof); + TAILQ_INIT(&its->its_worklist); + for (i = 0; i < TIMER_MAX; i++) + its->its_timers[i] = NULL; + PROC_LOCK(p); + if (p->p_itimers == NULL) { + p->p_itimers = its; + PROC_UNLOCK(p); + } + else { + PROC_UNLOCK(p); + free(its, M_SUBPROC); + } +} + +static void +itimers_event_hook_exec(void *arg, struct proc *p, struct image_params *imgp __unused) +{ + itimers_event_hook_exit(arg, p); +} + +/* Clean up timers when some process events are being triggered. */ +static void +itimers_event_hook_exit(void *arg, struct proc *p) +{ + struct itimers *its; + struct itimer *it; + int event = (int)(intptr_t)arg; + int i; + + if (p->p_itimers != NULL) { + its = p->p_itimers; + for (i = 0; i < MAX_CLOCKS; ++i) { + if (posix_clocks[i].event_hook != NULL) + CLOCK_CALL(i, event_hook, (p, i, event)); + } + /* + * According to susv3, XSI interval timers should be inherited + * by new image. + */ + if (event == ITIMER_EV_EXEC) + i = 3; + else if (event == ITIMER_EV_EXIT) + i = 0; + else + panic("unhandled event"); + for (; i < TIMER_MAX; ++i) { + if ((it = its->its_timers[i]) != NULL) + kern_timer_delete(curthread, i); + } + if (its->its_timers[0] == NULL && + its->its_timers[1] == NULL && + its->its_timers[2] == NULL) { + free(its, M_SUBPROC); + p->p_itimers = NULL; + } + } +} +#endif /* __rtems__ */ |