X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/9bccf70c0258c7cac2dcb80011b2a964d884c552..cf7d32b81c573a0536dc4da4157f9c26f8d0bed3:/bsd/kern/kern_time.c diff --git a/bsd/kern/kern_time.c b/bsd/kern/kern_time.c index d41be2383..30b0a651c 100644 --- a/bsd/kern/kern_time.c +++ b/bsd/kern/kern_time.c @@ -1,23 +1,29 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* @@ -54,23 +60,45 @@ * * @(#)kern_time.c 8.4 (Berkeley) 5/26/95 */ +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. + */ #include #include #include #include -#include +#include +#include #include -#include +#include +#include +#include #include +#include +#include +#if CONFIG_MACF +#include +#endif #define HZ 100 /* XXX */ -volatile struct timeval time; /* simple lock used to access timezone, tz structure */ -decl_simple_lock_data(, tz_slock); +lck_spin_t * tz_slock; +lck_grp_t * tz_slock_grp; +lck_attr_t * tz_slock_attr; +lck_grp_attr_t *tz_slock_grp_attr; + +static void setthetime( + struct timeval *tv); + +void time_zone_slock_init(void) __attribute__((section("__TEXT, initcode"))); + /* * Time of day and interval timer support. * @@ -80,195 +108,171 @@ decl_simple_lock_data(, tz_slock); * and decrementing interval timers, optionally reloading the interval * timers when they expire. */ -struct gettimeofday_args{ - struct timeval *tp; - struct timezone *tzp; -}; /* ARGSUSED */ int -gettimeofday(p, uap, retval) - struct proc *p; - register struct gettimeofday_args *uap; - register_t *retval; +gettimeofday( +__unused struct proc *p, + struct gettimeofday_args *uap, + register_t *retval) { - struct timeval atv; int error = 0; - extern simple_lock_data_t tz_slock; struct timezone ltz; /* local copy */ -/* NOTE THIS implementation is for non ppc architectures only */ - - if (uap->tp) { - microtime(&atv); - if (error = copyout((caddr_t)&atv, (caddr_t)uap->tp, - sizeof (atv))) - return(error); - } + if (uap->tp) + clock_gettimeofday((uint32_t *)&retval[0], (uint32_t *)&retval[1]); if (uap->tzp) { - usimple_lock(&tz_slock); + lck_spin_lock(tz_slock); ltz = tz; - usimple_unlock(&tz_slock); - error = copyout((caddr_t)<z, (caddr_t)uap->tzp, - sizeof (tz)); + lck_spin_unlock(tz_slock); + + error = copyout((caddr_t)<z, CAST_USER_ADDR_T(uap->tzp), sizeof (tz)); } - return(error); + return (error); } -struct settimeofday_args { - struct timeval *tv; - struct timezone *tzp; -}; +/* + * XXX Y2038 bug because of setthetime() argument + */ /* ARGSUSED */ int -settimeofday(p, uap, retval) - struct proc *p; - struct settimeofday_args *uap; - register_t *retval; +settimeofday(__unused struct proc *p, struct settimeofday_args *uap, __unused register_t *retval) { struct timeval atv; struct timezone atz; - int error, s; - extern simple_lock_data_t tz_slock; + int error; - if (error = suser(p->p_ucred, &p->p_acflag)) +#if CONFIG_MACF + error = mac_system_check_settime(kauth_cred_get()); + if (error) return (error); - /* Verify all parameters before changing time. */ - if (uap->tv && (error = copyin((caddr_t)uap->tv, - (caddr_t)&atv, sizeof(atv)))) +#endif +#ifndef CONFIG_EMBEDDED + if ((error = suser(kauth_cred_get(), &p->p_acflag))) return (error); - if (uap->tzp && (error = copyin((caddr_t)uap->tzp, - (caddr_t)&atz, sizeof(atz)))) +#endif + /* Verify all parameters before changing time */ + if (uap->tv) { + if (IS_64BIT_PROCESS(p)) { + struct user_timeval user_atv; + error = copyin(uap->tv, &user_atv, sizeof(struct user_timeval)); + atv.tv_sec = user_atv.tv_sec; + atv.tv_usec = user_atv.tv_usec; + } else { + error = copyin(uap->tv, &atv, sizeof(struct timeval)); + } + if (error) + return (error); + } + if (uap->tzp && (error = copyin(uap->tzp, (caddr_t)&atz, sizeof(atz)))) return (error); - if (uap->tv) + if (uap->tv) { + timevalfix(&atv); + if (atv.tv_sec < 0 || (atv.tv_sec == 0 && atv.tv_usec < 0)) + return (EPERM); setthetime(&atv); + } if (uap->tzp) { - usimple_lock(&tz_slock); + lck_spin_lock(tz_slock); tz = atz; - usimple_unlock(&tz_slock); + lck_spin_unlock(tz_slock); } return (0); } -setthetime(tv) - struct timeval *tv; +static void +setthetime( + struct timeval *tv) { - long delta = tv->tv_sec - time.tv_sec; - mach_timespec_t now; - - now.tv_sec = tv->tv_sec; - now.tv_nsec = tv->tv_usec * NSEC_PER_USEC; - - clock_set_calendar_value(now); - boottime.tv_sec += delta; -#if NFSCLIENT || NFSSERVER - lease_updatetime(delta); -#endif + clock_set_calendar_microtime(tv->tv_sec, tv->tv_usec); } -#define tickadj (40 * NSEC_PER_USEC) /* "standard" skew, ns / 10 ms */ -#define bigadj (1 * NSEC_PER_SEC) /* use 10x skew above bigadj ns */ - -struct adjtime_args { - struct timeval *delta; - struct timeval *olddelta; -}; +/* + * XXX Y2038 bug because of clock_adjtime() first argument + */ /* ARGSUSED */ int -adjtime(p, uap, retval) - struct proc *p; - register struct adjtime_args *uap; - register_t *retval; +adjtime(struct proc *p, struct adjtime_args *uap, __unused register_t *retval) { struct timeval atv; - int64_t total; - uint32_t delta; int error; - if (error = suser(p->p_ucred, &p->p_acflag)) +#if CONFIG_MACF + error = mac_system_check_settime(kauth_cred_get()); + if (error) + return (error); +#endif + if ((error = suser(kauth_cred_get(), &p->p_acflag))) return (error); - if (error = copyin((caddr_t)uap->delta, - (caddr_t)&atv, sizeof (struct timeval))) + if (IS_64BIT_PROCESS(p)) { + struct user_timeval user_atv; + error = copyin(uap->delta, &user_atv, sizeof(struct user_timeval)); + atv.tv_sec = user_atv.tv_sec; + atv.tv_usec = user_atv.tv_usec; + } else { + error = copyin(uap->delta, &atv, sizeof(struct timeval)); + } + if (error) return (error); - /* - * Compute the total correction and the rate at which to apply it. - */ - total = (int64_t)atv.tv_sec * NSEC_PER_SEC + atv.tv_usec * NSEC_PER_USEC; - if (total > bigadj || total < -bigadj) - delta = 10 * tickadj; - else - delta = tickadj; - - total = clock_set_calendar_adjtime(total, delta); + /* + * Compute the total correction and the rate at which to apply it. + */ + clock_adjtime((int32_t *)&atv.tv_sec, &atv.tv_usec); if (uap->olddelta) { - atv.tv_sec = total / NSEC_PER_SEC; - atv.tv_usec = (total / NSEC_PER_USEC) % USEC_PER_SEC; - (void) copyout((caddr_t)&atv, - (caddr_t)uap->olddelta, sizeof (struct timeval)); + if (IS_64BIT_PROCESS(p)) { + struct user_timeval user_atv; + user_atv.tv_sec = atv.tv_sec; + user_atv.tv_usec = atv.tv_usec; + error = copyout(&user_atv, uap->olddelta, sizeof(struct user_timeval)); + } else { + error = copyout(&atv, uap->olddelta, sizeof(struct timeval)); + } } return (0); } /* - * Initialze the time of day register. - * Trust the RTC except for the case where it is set before - * the UNIX epoch. In that case use the the UNIX epoch. - * The argument passed in is ignored. + * Verify the calendar value. If negative, + * reset to zero (the epoch). */ void -inittodr(base) - time_t base; +inittodr( + __unused time_t base) { + struct timeval tv; + /* * Assertion: * The calendar has already been - * set up from the battery clock. + * set up from the platform clock. * * The value returned by microtime() * is gotten from the calendar. */ - microtime(&time); - - /* - * This variable still exists to keep - * 'w' happy. It should only be considered - * an approximation. - */ - boottime.tv_sec = time.tv_sec; - boottime.tv_usec = 0; + microtime(&tv); - /* - * If the RTC does not have acceptable value, i.e. time before - * the UNIX epoch, set it to the UNIX epoch - */ - if (time.tv_sec < 0) { + if (tv.tv_sec < 0 || tv.tv_usec < 0) { printf ("WARNING: preposterous time in Real Time Clock"); - time.tv_sec = 0; /* the UNIX epoch */ - time.tv_usec = 0; - setthetime(&time); - boottime = time; + tv.tv_sec = 0; /* the UNIX epoch */ + tv.tv_usec = 0; + setthetime(&tv); printf(" -- CHECK AND RESET THE DATE!\n"); } - - return; } -void timevaladd( - struct timeval *t1, - struct timeval *t2); -void timevalsub( - struct timeval *t1, - struct timeval *t2); -void timevalfix( - struct timeval *t1); +time_t +boottime_sec(void) +{ + uint32_t sec, nanosec; + clock_get_boottime_nanotime(&sec, &nanosec); + return (sec); +} -uint64_t - tvtoabstime( - struct timeval *tvp); +uint64_t tvtoabstime(struct timeval *tvp); /* * Get value of an interval timer. The process virtual and @@ -279,33 +283,32 @@ uint64_t * 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 callout - * routine. Since a callout may be delayed in real time due to + * The real time timer is processed by a callout routine. + * Since a callout may be delayed in real time due to * other processing in the system, it is possible for the real * time callout 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 time .it_value from the * real time .it_interval. Rather, we compute the next time in * absolute time when the timer should go off. + * + * Returns: 0 Success + * EINVAL Invalid argument + * copyout:EFAULT Bad address */ - -struct getitimer_args { - u_int which; - struct itimerval *itv; -}; /* ARGSUSED */ int -getitimer(p, uap, retval) - struct proc *p; - register struct getitimer_args *uap; - register_t *retval; +getitimer(struct proc *p, struct getitimer_args *uap, __unused register_t *retval) { struct itimerval aitv; if (uap->which > ITIMER_PROF) return(EINVAL); - if (uap->which == ITIMER_REAL) { + + proc_spinlock(p); + switch (uap->which) { + + case ITIMER_REAL: /* * If time for real time timer has passed return 0, * else return difference between current time and @@ -325,58 +328,112 @@ getitimer(p, uap, retval) } else timerclear(&aitv.it_value); + break; + + case ITIMER_VIRTUAL: + aitv = p->p_vtimer_user; + break; + + case ITIMER_PROF: + aitv = p->p_vtimer_prof; + break; } - else - aitv = p->p_stats->p_timer[uap->which]; - return (copyout((caddr_t)&aitv, - (caddr_t)uap->itv, sizeof (struct itimerval))); + proc_spinunlock(p); + + if (IS_64BIT_PROCESS(p)) { + struct user_itimerval user_itv; + user_itv.it_interval.tv_sec = aitv.it_interval.tv_sec; + user_itv.it_interval.tv_usec = aitv.it_interval.tv_usec; + user_itv.it_value.tv_sec = aitv.it_value.tv_sec; + user_itv.it_value.tv_usec = aitv.it_value.tv_usec; + return (copyout((caddr_t)&user_itv, uap->itv, sizeof (struct user_itimerval))); + } else { + return (copyout((caddr_t)&aitv, uap->itv, sizeof (struct itimerval))); + } } -struct setitimer_args { - u_int which; - struct itimerval *itv; - struct itimerval *oitv; -}; +/* + * Returns: 0 Success + * EINVAL Invalid argument + * copyin:EFAULT Bad address + * getitimer:EINVAL Invalid argument + * getitimer:EFAULT Bad address + */ /* ARGSUSED */ int -setitimer(p, uap, retval) - struct proc *p; - register struct setitimer_args *uap; - register_t *retval; +setitimer(struct proc *p, struct setitimer_args *uap, register_t *retval) { struct itimerval aitv; - register struct itimerval *itvp; + user_addr_t itvp; int error; if (uap->which > ITIMER_PROF) return (EINVAL); - if ((itvp = uap->itv) && - (error = copyin((caddr_t)itvp, - (caddr_t)&aitv, sizeof (struct itimerval)))) - return (error); - if ((uap->itv = uap->oitv) && (error = getitimer(p, uap, retval))) + if ((itvp = uap->itv)) { + if (IS_64BIT_PROCESS(p)) { + struct user_itimerval user_itv; + if ((error = copyin(itvp, (caddr_t)&user_itv, sizeof (struct user_itimerval)))) + return (error); + aitv.it_interval.tv_sec = user_itv.it_interval.tv_sec; + aitv.it_interval.tv_usec = user_itv.it_interval.tv_usec; + aitv.it_value.tv_sec = user_itv.it_value.tv_sec; + aitv.it_value.tv_usec = user_itv.it_value.tv_usec; + } else { + if ((error = copyin(itvp, (caddr_t)&aitv, sizeof (struct itimerval)))) + return (error); + } + } + if ((uap->itv = uap->oitv) && (error = getitimer(p, (struct getitimer_args *)uap, retval))) return (error); if (itvp == 0) return (0); if (itimerfix(&aitv.it_value) || itimerfix(&aitv.it_interval)) return (EINVAL); - if (uap->which == ITIMER_REAL) { - thread_call_func_cancel(realitexpire, (void *)p->p_pid, FALSE); + + switch (uap->which) { + + case ITIMER_REAL: + proc_spinlock(p); if (timerisset(&aitv.it_value)) { microuptime(&p->p_rtime); timevaladd(&p->p_rtime, &aitv.it_value); - thread_call_func_delayed( - realitexpire, (void *)p->p_pid, - tvtoabstime(&p->p_rtime)); + p->p_realtimer = aitv; + if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime))) + p->p_ractive++; + } else { + timerclear(&p->p_rtime); + p->p_realtimer = aitv; + if (thread_call_cancel(p->p_rcall)) + p->p_ractive--; } + proc_spinunlock(p); + + break; + + + case ITIMER_VIRTUAL: + if (timerisset(&aitv.it_value)) + task_vtimer_set(p->task, TASK_VTIMER_USER); + else + task_vtimer_clear(p->task, TASK_VTIMER_USER); + + proc_spinlock(p); + p->p_vtimer_user = aitv; + proc_spinunlock(p); + break; + + case ITIMER_PROF: + if (timerisset(&aitv.it_value)) + task_vtimer_set(p->task, TASK_VTIMER_PROF); else - timerclear(&p->p_rtime); + task_vtimer_clear(p->task, TASK_VTIMER_PROF); - p->p_realtimer = aitv; + proc_spinlock(p); + p->p_vtimer_prof = aitv; + proc_spinunlock(p); + break; } - else - p->p_stats->p_timer[uap->which] = aitv; return (0); } @@ -391,65 +448,68 @@ setitimer(p, uap, retval) */ void realitexpire( - void *pid) + struct proc *p) { - register struct proc *p; - struct timeval now; - boolean_t funnel_state = thread_funnel_set(kernel_flock, TRUE); + struct proc *r; + struct timeval t; - p = pfind((pid_t)pid); - if (p == NULL) { - (void) thread_funnel_set(kernel_flock, FALSE); + r = proc_find(p->p_pid); + + proc_spinlock(p); + + if (--p->p_ractive > 0 || r != p) { + proc_spinunlock(p); + + if (r != NULL) + proc_rele(r); return; } - + if (!timerisset(&p->p_realtimer.it_interval)) { timerclear(&p->p_rtime); - psignal(p, SIGALRM); + proc_spinunlock(p); - (void) thread_funnel_set(kernel_flock, FALSE); + psignal(p, SIGALRM); + proc_rele(p); return; } - microuptime(&now); + microuptime(&t); timevaladd(&p->p_rtime, &p->p_realtimer.it_interval); - if (timercmp(&p->p_rtime, &now, <=)) { - if ((p->p_rtime.tv_sec + 2) >= now.tv_sec) { + if (timercmp(&p->p_rtime, &t, <=)) { + if ((p->p_rtime.tv_sec + 2) >= t.tv_sec) { for (;;) { timevaladd(&p->p_rtime, &p->p_realtimer.it_interval); - if (timercmp(&p->p_rtime, &now, >)) + if (timercmp(&p->p_rtime, &t, >)) break; } } else { p->p_rtime = p->p_realtimer.it_interval; - timevaladd(&p->p_rtime, &now); + timevaladd(&p->p_rtime, &t); } } - thread_call_func_delayed(realitexpire, pid, tvtoabstime(&p->p_rtime)); + if (!thread_call_enter_delayed(p->p_rcall, tvtoabstime(&p->p_rtime))) + p->p_ractive++; + proc_spinunlock(p); psignal(p, SIGALRM); - - (void) thread_funnel_set(kernel_flock, FALSE); + proc_rele(p); } /* * 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.) + * .it_interval part of an interval timer is acceptable. */ int -itimerfix(tv) - struct timeval *tv; +itimerfix( + struct timeval *tv) { if (tv->tv_sec < 0 || tv->tv_sec > 100000000 || 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); } @@ -458,17 +518,18 @@ itimerfix(tv) * 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 - * reducint the value reloaded into the timer so that + * 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(itp, usec) - register struct itimerval *itp; - int usec; +itimerdecr(proc_t p, + struct itimerval *itp, int usec) { + proc_spinlock(p); + if (itp->it_value.tv_usec < usec) { if (itp->it_value.tv_sec == 0) { /* expired, and already in next interval */ @@ -480,19 +541,24 @@ itimerdecr(itp, usec) } itp->it_value.tv_usec -= usec; usec = 0; - if (timerisset(&itp->it_value)) + if (timerisset(&itp->it_value)) { + proc_spinunlock(p); return (1); + } /* expired, exactly at end of interval */ expire: if (timerisset(&itp->it_interval)) { itp->it_value = itp->it_interval; + if (itp->it_value.tv_sec > 0) { 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 */ + proc_spinunlock(p); return (0); } @@ -546,20 +612,14 @@ void microtime( struct timeval *tvp) { - mach_timespec_t now = clock_get_calendar_value(); - - tvp->tv_sec = now.tv_sec; - tvp->tv_usec = now.tv_nsec / NSEC_PER_USEC; + clock_get_calendar_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec); } void microuptime( struct timeval *tvp) { - mach_timespec_t now = clock_get_system_value(); - - tvp->tv_sec = now.tv_sec; - tvp->tv_usec = now.tv_nsec / NSEC_PER_USEC; + clock_get_system_microtime((uint32_t *)&tvp->tv_sec, (uint32_t *)&tvp->tv_usec); } /* @@ -569,20 +629,14 @@ void nanotime( struct timespec *tsp) { - mach_timespec_t now = clock_get_calendar_value(); - - tsp->tv_sec = now.tv_sec; - tsp->tv_nsec = now.tv_nsec; + clock_get_calendar_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec); } void nanouptime( struct timespec *tsp) { - mach_timespec_t now = clock_get_system_value(); - - tsp->tv_sec = now.tv_sec; - tsp->tv_nsec = now.tv_nsec; + clock_get_system_nanotime((uint32_t *)&tsp->tv_sec, (uint32_t *)&tsp->tv_nsec); } uint64_t @@ -601,9 +655,14 @@ tvtoabstime( void time_zone_slock_init(void) { - extern simple_lock_data_t tz_slock; + /* allocate lock group attribute and group */ + tz_slock_grp_attr = lck_grp_attr_alloc_init(); - simple_lock_init(&tz_slock); + tz_slock_grp = lck_grp_alloc_init("tzlock", tz_slock_grp_attr); + /* Allocate lock attribute */ + tz_slock_attr = lck_attr_alloc_init(); + /* Allocate the spin lock */ + tz_slock = lck_spin_alloc_init(tz_slock_grp, tz_slock_attr); }