kern_time.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$Id: kern_time.c,v 1.1.1.1 2001/10/01 18:47:34 patrik Exp $ */
/*	$OpenBSD: kern_time.c,v 1.14 1999/06/06 19:21:34 deraadt Exp $	*/
/*	$NetBSD: kern_time.c,v 1.20 1996/02/18 11:57:06 fvdl Exp $	*/

/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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	8.4 (Berkeley) 5/26/95
 */

#include <sys/param.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc.h>
#if 0
#include <sys/vnode.h>
#endif
#include <sys/signalvar.h>

#if 0
#include <sys/mount.h>
#endif
#include <sys/syscallargs.h>

#if defined(NFSCLIENT) || defined(NFSSERVER)
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs_var.h>
#endif

#include <machine/cpu.h>


#ifdef NOTUSED_BY_PMON

static void	settime __P((struct timeval *));
/* 
 * 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.
 */

/* This function is used by clock_settime and settimeofday */
static void
settime(tv)
	struct timeval *tv;
{
	struct timeval delta;
	int s;

	/* WHAT DO WE DO ABOUT PENDING REAL-TIME TIMEOUTS??? */
	s = splclock();
	timersub(tv, &time, &delta);
	time = *tv;
	(void) splsoftclock();
	timeradd(&boottime, &delta, &boottime);
	timeradd(&runtime, &delta, &runtime);
#	if defined(NFS) || defined(NFSSERVER)
		nqnfs_lease_updatetime(delta.tv_sec);
#	endif
	splx(s);
	resettodr();
}

#ifndef POSIX1003_1b
/* ARGSUSED */
int
sys_clock_gettime(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_clock_gettime_args /* {
		syscallarg(clockid_t) clock_id;
		syscallarg(struct timespec *) tp;
	} */ *uap = v;
	clockid_t clock_id;
	struct timeval atv;
	struct timespec ats;

	clock_id = SCARG(uap, clock_id);
	if (clock_id != CLOCK_REALTIME)
		return (EINVAL);

	microtime(&atv);
	TIMEVAL_TO_TIMESPEC(&atv,&ats);

	return copyout(&ats, SCARG(uap, tp), sizeof(ats));
}

/* ARGSUSED */
int
sys_clock_settime(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_clock_settime_args /* {
		syscallarg(clockid_t) clock_id;
		syscallarg(const struct timespec *) tp;
	} */ *uap = v;
	clockid_t clock_id;
	struct timeval atv;
	struct timespec ats;
	int error;

	if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
		return (error);

	clock_id = SCARG(uap, clock_id);
	if (clock_id != CLOCK_REALTIME)
		return (EINVAL);

	if ((error = copyin(SCARG(uap, tp), &ats, sizeof(ats))) != 0)
		return (error);

	TIMESPEC_TO_TIMEVAL(&atv,&ats);

	/*
	 * If the system is secure, we do not allow the time to be
	 * set to an earlier value (it may be slowed using adjtime,
	 * but not set back). This feature prevent interlopers from
	 * setting arbitrary time stamps on files.
	 */
	if (securelevel > 1 && timercmp(&atv, &time, <))
		return (EPERM);
	settime(&atv);

	return (0);
}

int
sys_clock_getres(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_clock_getres_args /* {
		syscallarg(clockid_t) clock_id;
		syscallarg(struct timespec *) tp;
	} */ *uap = v;
	clockid_t clock_id;
	struct timespec ts;
	int error = 0;

	clock_id = SCARG(uap, clock_id);
	if (clock_id != CLOCK_REALTIME)
		return (EINVAL);

	if (SCARG(uap, tp)) {
		ts.tv_sec = 0;
		ts.tv_nsec = 1000000000 / hz;

		error = copyout(&ts, SCARG(uap, tp), sizeof (ts));
	}

	return error;
}

/* ARGSUSED */
int
sys_nanosleep(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	static int nanowait;
	register struct sys_nanosleep_args/* {
		syscallarg(const struct timespec *) rqtp;
		syscallarg(struct timespec *) rmtp;
	} */ *uap = v;
	struct timespec rqt;
	struct timespec rmt;
	struct timeval atv, utv;
	int error, s, timo;

	error = copyin((const void *)SCARG(uap, rqtp), (void *)&rqt,
	    sizeof(struct timespec));
	if (error)
		return (error);

	TIMESPEC_TO_TIMEVAL(&atv,&rqt)
	if (itimerfix(&atv))
		return (EINVAL);

	s = splclock();
	timeradd(&atv,&time,&atv);
	timo = hzto(&atv);
	/* 
	 * Avoid inadvertantly sleeping forever
	 */
	if (timo == 0)
		timo = 1;
	splx(s);

	error = tsleep(&nanowait, PWAIT | PCATCH, "nanosleep", timo);
	if (error == ERESTART)
		error = EINTR;
	if (error == EWOULDBLOCK)
		error = 0;

	if (SCARG(uap, rmtp)) {
		int error;

		s = splclock();
		utv = time;
		splx(s);

		timersub(&atv, &utv, &utv);
		if (utv.tv_sec < 0)
			timerclear(&utv);

		TIMEVAL_TO_TIMESPEC(&utv, &rmt);
		error = copyout((void *)&rmt, (void *)SCARG(uap,rmtp),
		    sizeof(rmt));		
		if (error)
			return (error);
	}

	return error;
}
#endif          /* ! POSIX1003_1b */
#endif /* NOTUSED_BY_PMON */

/* ARGSUSED */
int
sys_gettimeofday(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	register struct sys_gettimeofday_args /* {
		syscallarg(struct timeval *) tp;
		syscallarg(struct timezone *) tzp;
	} */ *uap = v;
	struct timeval atv;
	int error = 0;

	if (SCARG(uap, tp)) {
		microtime(&atv);
		if ((error = copyout((void *)&atv, (void *)SCARG(uap, tp),
		    sizeof (atv))))
			return (error);
	}
	if (SCARG(uap, tzp))
		error = copyout((void *)&tz, (void *)SCARG(uap, tzp),
		    sizeof (tz));
	return (error);
}

#ifdef NOTUSED_BY_PMON
/* ARGSUSED */
int
sys_settimeofday(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct sys_settimeofday_args /* {
		syscallarg(struct timeval *) tv;
		syscallarg(struct timezone *) tzp;