284 lines
6.7 KiB
C
284 lines
6.7 KiB
C
/* $NetBSD: openfirmio.c,v 1.13 2014/07/25 08:10:37 dholland Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)openfirm.c 8.1 (Berkeley) 6/11/93
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: openfirmio.c,v 1.13 2014/07/25 08:10:37 dholland Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/device.h>
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#include <sys/event.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/openfirmio.h>
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static int lastnode; /* speed hack */
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static int openfirmcheckid (int, int);
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static int openfirmgetstr (int, char *, char **);
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void openfirmattach (int);
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dev_type_ioctl(openfirmioctl);
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const struct cdevsw openfirm_cdevsw = {
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.d_open = nullopen,
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.d_close = nullclose,
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.d_read = noread,
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.d_write = nowrite,
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.d_ioctl = openfirmioctl,
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.d_stop = nostop,
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.d_tty = notty,
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.d_poll = nopoll,
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.d_mmap = nommap,
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.d_kqfilter = nokqfilter,
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.d_discard = nodiscard,
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.d_flag = 0
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};
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void
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openfirmattach(int num)
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{
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/* nothing */
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}
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/*
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* Verify target ID is valid (exists in the OPENPROM tree), as
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* listed from node ID sid forward.
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*/
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static int
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openfirmcheckid(int sid, int tid)
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{
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for (; sid != 0; sid = OF_peer(sid))
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if (sid == tid || openfirmcheckid(OF_child(sid), tid))
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return (1);
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return (0);
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}
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static int
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openfirmgetstr(int len, char *user, char **cpp)
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{
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int error;
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char *cp;
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/* Reject obvious bogus requests */
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if ((u_int)len > (8 * 1024) - 1)
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return (ENAMETOOLONG);
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*cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
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error = copyin(user, cp, len);
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cp[len] = '\0';
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return (error);
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}
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int
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openfirmioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
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{
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struct ofiocdesc *of;
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int node, len, ok, error, s;
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char *name, *value;
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if (cmd == OFIOCGETOPTNODE) {
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s = splhigh();
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*(int *) data = OF_finddevice("/options");
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splx(s);
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return (0);
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}
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/* Verify node id */
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of = (struct ofiocdesc *)data;
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node = of->of_nodeid;
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if (node != 0 && node != lastnode) {
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/* Not an easy one, must search for it */
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s = splhigh();
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ok = openfirmcheckid(OF_peer(0), node);
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splx(s);
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if (!ok)
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return (EINVAL);
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lastnode = node;
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}
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name = value = NULL;
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error = 0;
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switch (cmd) {
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case OFIOCGET:
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if ((flags & FREAD) == 0)
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return (EBADF);
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if (node == 0)
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return (EINVAL);
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error = openfirmgetstr(of->of_namelen, of->of_name, &name);
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if (error)
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break;
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s = splhigh();
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len = OF_getproplen(node, name);
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splx(s);
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if (len > of->of_buflen) {
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error = ENOMEM;
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break;
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}
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of->of_buflen = len;
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/* -1 means no entry; 0 means no value */
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if (len <= 0)
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break;
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value = malloc(len, M_TEMP, M_WAITOK);
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if (value == NULL) {
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error = ENOMEM;
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break;
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}
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s = splhigh();
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len = OF_getprop(node, name, (void *)value, len);
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splx(s);
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error = copyout(value, of->of_buf, len);
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break;
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case OFIOCSET:
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if ((flags & FWRITE) == 0)
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return (EBADF);
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if (node == 0)
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return (EINVAL);
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error = openfirmgetstr(of->of_namelen, of->of_name, &name);
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if (error)
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break;
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error = openfirmgetstr(of->of_buflen, of->of_buf, &value);
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if (error)
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break;
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s = splhigh();
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len = OF_setprop(node, name, value, of->of_buflen + 1);
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splx(s);
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/*
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* XXX
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* some OF implementations return the buffer length including
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* the trailing zero ( like macppc ) and some without ( like
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* FirmWorks OF used in Shark )
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*/
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if ((len != (of->of_buflen + 1)) && (len != of->of_buflen))
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error = EINVAL;
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break;
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case OFIOCNEXTPROP: {
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char newname[32];
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if ((flags & FREAD) == 0)
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return (EBADF);
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if (node == 0)
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return (EINVAL);
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if (of->of_namelen != 0) {
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error = openfirmgetstr(of->of_namelen, of->of_name,
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&name);
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if (error)
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break;
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}
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s = splhigh();
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ok = OF_nextprop(node, name, newname);
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splx(s);
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if (ok == 0) {
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error = ENOENT;
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break;
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}
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if (ok == -1) {
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error = EINVAL;
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break;
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}
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len = strlen(newname);
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if (len > of->of_buflen)
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len = of->of_buflen;
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else
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of->of_buflen = len;
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error = copyout(newname, of->of_buf, len);
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break;
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}
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case OFIOCGETNEXT:
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if ((flags & FREAD) == 0)
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return (EBADF);
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s = splhigh();
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node = OF_peer(node);
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splx(s);
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*(int *)data = lastnode = node;
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break;
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case OFIOCGETCHILD:
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if ((flags & FREAD) == 0)
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return (EBADF);
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if (node == 0)
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return (EINVAL);
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s = splhigh();
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node = OF_child(node);
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splx(s);
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*(int *)data = lastnode = node;
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break;
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case OFIOCFINDDEVICE:
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if ((flags & FREAD) == 0)
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return (EBADF);
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error = openfirmgetstr(of->of_namelen, of->of_name, &name);
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if (error)
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break;
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node = OF_finddevice(name);
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if (node == 0 || node == -1) {
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error = ENOENT;
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break;
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}
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of->of_nodeid = lastnode = node;
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break;
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default:
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return (ENOTTY);
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}
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if (name)
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free(name, M_TEMP);
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if (value)
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free(value, M_TEMP);
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return (error);
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}
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