sys_machdep.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)sys_machdep.c	4.1	ULTRIX	7/2/90";
#endif	lint

/************************************************************************
 *									*
 *			Copyright (c) 1984, 1986 by			*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any	other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived	from  software	received  from	the	*
 *   University    of	California,   Berkeley,   and	from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is	subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or	reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 * sys_machdep.c   6.1	   07/29/83
 *
 * Modification history
 *
 * 10-Oct-88 -- jaw
 *	replace switch_to_master with general routine switch_affinity
 *
 * 23-Aug-88 - miche
 *	Add support for ref'ing processing for vdoualarm
 *
 * Miscellaneous kernel machine dependent routines
 *
 * 01-Apr-86 - Ricky Palmer
 *
 *	Derived from 4.2BSD labeled: sys_machdep.c 6.1	83/07/29.
 *	Added copyright notice and changed "dkio.h" include.
 *
 */

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/ioctl.h"
#include "../h/file.h"
#include "../h/proc.h"
#include "../h/uio.h"
#include "../h/kernel.h"
#include "../h/mtio.h"
#include "../h/buf.h"
#include "../h/dkio.h"
#include "../h/cpudata.h"

#include "../machine/pte.h"
#include "../io/uba/ubareg.h"
#include "../io/uba/ubavar.h"

resuba()
{
	int saveaffinity;

/* UNIBUS is NOT mpsafe */
	if (suser()) {
		if (u.u_arg[0] < numuba) {
			saveaffinity = switch_affinity(boot_cpu_mask);
			ubareset(u.u_arg[0]);
			(void) switch_affinity(saveaffinity);
		}
	}

}

#ifdef TRACE
int	nvualarm;

vtrace()
{
	register struct a {
		int	request;
		int	value;
	} *uap;
	int vdoualarm();

	uap = (struct a *)u.u_ap;
	switch (uap->request) {

	case VTR_DISABLE:		/* disable a trace point */
	case VTR_ENABLE:		/* enable a trace point */
		if (uap->value < 0 || uap->value >= TR_NFLAGS)
			u.u_error = EINVAL;
		else {
			u.u_r.r_val1 = traceflags[uap->value];
			traceflags[uap->value] = uap->request;
		}
		break;

	case VTR_VALUE: 	/* return a trace point setting */
		if (uap->value < 0 || uap->value >= TR_NFLAGS)
			u.u_error = EINVAL;
		else
			u.u_r.r_val1 = traceflags[uap->value];
		break;

	case VTR_UALARM:	/* set a real-time ualarm, less than 1 min */
		if (uap->value <= 0 || uap->value > 60 * hz ||
		    nvualarm > 5)
			u.u_error = EINVAL;
		else {
			nvualarm++;
			timeout(vdoualarm, (caddr_t)u.u_procp->p_pid,
			    uap->value);
		}
		break;

	case VTR_STAMP:
		trace(TR_STAMP, uap->value, u.u_procp->p_pid);
		break;
	}
}

vdoualarm(arg)
	int arg;
{
	register struct proc *p;

	if (p = proc_get(arg)) {
		psignal(p, 16);
		proc_rele(p);
	}
	nvualarm--;
}
#endif

#ifdef COMPAT
/*
 * Note: these tables are sorted by
 * ioctl "code" (in ascending order).
 */
int dctls[] = { DKIOCHDR, 0 };
int fctls[] = { FIOCLEX, FIONCLEX, FIOASYNC, FIONBIO, FIONREAD, 0 };
int mctls[] = { MTIOCTOP, MTIOCGET, 0 };
int tctls[] = {
	TIOCGETD, TIOCSETD, TIOCHPCL, TIOCMODG, TIOCMODS,
	TIOCGETP, TIOCSETP, TIOCSETN, TIOCEXCL, TIOCNXCL,
	TIOCFLUSH,TIOCSETC, TIOCGETC, TIOCREMOTE,TIOCMGET,
	TIOCMBIC, TIOCMBIS, TIOCMSET, TIOCSTART,TIOCSTOP,
	TIOCPKT,  TIOCNOTTY,TIOCSTI,  TIOCOUTQ, TIOCGLTC,
	TIOCSLTC, TIOCSPGRP,TIOCGPGRP,TIOCCDTR, TIOCSDTR,
	TIOCCBRK, TIOCSBRK, TIOCLGET, TIOCLSET, TIOCLBIC,
	TIOCLBIS, 0
};

/*
 * Map an old style ioctl command to new.
 */
mapioctl(cmd)
	int cmd;
{
	register int *map, c;

	switch ((cmd >> 8) & 0xff) {

	case 'd':
		map = dctls;
		break;

	case 'f':
		map = fctls;
		break;

	case 'm':
		map = mctls;
		break;

	case 't':
		map = tctls;
		break;

	default:
		return (0);
	}
	while ((c = *map) && (c&0xff) < (cmd&0xff))
		map++;
	if (c && (c&0xff) == (cmd&0xff))
		return (c);
	return (0);
}
#endif