openprom.c

早期freebsd实现

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratory.
 *
 * 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.
 *
 *	@(#)openprom.c	8.1 (Berkeley) 6/11/93
 *
 * from: $Header: openprom.c,v 1.3 93/04/27 08:56:09 torek Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>

#include <machine/bsd_openprom.h>
#include <machine/openpromio.h>

static	int lastnode;			/* speed hack */
extern	int optionsnode;		/* node ID of ROM's options */
extern	int findroot();			/* returns node ID of top node */
extern	struct promvec *promvec;

int
openpromopen(dev, flags, mode)
	dev_t dev;
	int flags, mode;
{

	return (0);
}

int
openpromclose(dev, flags, mode)
	dev_t dev;
	int flags, mode;
{

	return (0);
}

/*
 * Verify target ID is valid (exists in the OPENPROM tree), as
 * listed from node ID sid forward.
 */
static int
openpromcheckid(sid, tid)
	register int sid, tid;
{
	register struct nodeops *no;

	no = promvec->pv_nodeops;
	for (; sid != 0; sid = no->no_nextnode(sid))
		if (sid == tid || openpromcheckid(no->no_child(sid), tid))
			return (1);

	return (0);
}

static int
openpromgetstr(len, user, cpp)
	int len;
	char *user, **cpp;
{
	register int error;
	register char *cp;

	/* Reject obvious bogus requests */
	if ((u_int)len > (8 * 1024) - 1)
		return (ENAMETOOLONG);

	*cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
	error = copyin(user, cp, len);
	cp[len] = '\0';
	return (error);
}

int
openpromioctl(dev, cmd, data, flags, p)
	dev_t dev;
	int cmd;
	caddr_t data;
	int flags;
	struct proc *p;
{
	register struct opiocdesc *op;
	register int node, len, ok, error, s;
	char *name, *value, *nextprop;
	register struct nodeops *no;

	/* All too easy... */
	if (cmd == OPIOCGETOPTNODE) {
		*(int *)data = optionsnode;
		return (0);
	}

	/* Verify node id */
	op = (struct opiocdesc *)data;
	node = op->op_nodeid;
	if (node != 0 && node != lastnode && node != optionsnode) {
		/* Not an easy one, must search for it */
		s = splhigh();
		ok = openpromcheckid(findroot(), node);
		splx(s);
		if (!ok)
			return (EINVAL);
		lastnode = node;
	}

	name = value = NULL;
	no = promvec->pv_nodeops;
	error = 0;
	switch (cmd) {

	case OPIOCGET:
		if ((flags & FREAD) == 0)
			return (EBADF);
		if (node == 0)
			return (EINVAL);
		error = openpromgetstr(op->op_namelen, op->op_name, &name);
		if (error)
			break;
		s = splhigh();
		len = no->no_proplen(node, name);
		splx(s);
		if (len > op->op_buflen)
			len = op->op_buflen;
		else
			op->op_buflen = len;
		/* -1 means no entry; 0 means no value */
		if (len <= 0)
			break;
		value = malloc(len, M_TEMP, M_WAITOK);
		s = splhigh();
		(void)no->no_getprop(node, name, value);
		splx(s);
		error = copyout(value, op->op_buf, len);
		break;

	case OPIOCSET:
		if ((flags & FWRITE) == 0)
			return (EBADF);
		if (node == 0)
			return (EINVAL);
		error = openpromgetstr(op->op_namelen, op->op_name, &name);
		if (error)
			break;
		error = openpromgetstr(op->op_buflen, op->op_buf, &value);
		if (error)
			break;
		s = splhigh();
		len = no->no_setprop(node, name, value, op->op_buflen + 1);
		splx(s);
		if (len != op->op_buflen)
			error = EINVAL;
		break;

	case OPIOCNEXTPROP:
		if ((flags & FREAD) == 0)
			return (EBADF);
		if (node == 0)
			return (EINVAL);
		error = openpromgetstr(op->op_namelen, op->op_name, &name);
		if (error)
			break;
		s = splhigh();
		nextprop = no->no_nextprop(node, name);
		splx(s);
		len = strlen(nextprop);
		if (len > op->op_buflen)
			len = op->op_buflen;
		else
			op->op_buflen = len;
		error = copyout(nextprop, op->op_buf, len);
		break;

	case OPIOCGETNEXT:
		if ((flags & FREAD) == 0)
			return (EBADF);
		s = splhigh();
		node = no->no_nextnode(node);
		splx(s);
		*(int *)data = lastnode = node;
		break;

	case OPIOCGETCHILD:
		if ((flags & FREAD) == 0)
			return (EBADF);
		if (node == 0)
			return (EINVAL);
		s = splhigh();
		node = no->no_child(node);
		splx(s);
		*(int *)data = lastnode = node;
		break;

	default:
		return (ENOTTY);
	}

	if (name)
		free(name, M_TEMP);
	if (value)
		free(value, M_TEMP);

	return (error);
}