Add a pseudo device which allows to access the OpenFirmware device tree
via ioctl()s. This was ported from NetBSD and adapted a bit to better match our OpenFirmware support code.
This commit is contained in:
Thomas Moestl
parent
89492ca471
commit
de540622df
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=105398
308
sys/dev/ofw/openfirmio.c
Normal file
308
sys/dev/ofw/openfirmio.c
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@ -0,0 +1,308 @@
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/* $NetBSD: openfirmio.c,v 1.4 2002/09/06 13:23:19 gehenna 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. 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, Berkeley and its contributors.
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* 4. 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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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/errno.h>
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#include <sys/fcntl.h>
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#include <sys/ioccom.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <dev/ofw/openfirmio.h>
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static dev_t openfirm_dev;
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static d_ioctl_t openfirm_ioctl;
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#define CDEV_MAJOR 177
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#define OPENFIRM_MINOR 0
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static struct cdevsw openfirm_cdevsw = {
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/* open */ nullopen,
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/* close */ nullclose,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ openfirm_ioctl,
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/* poll */ nopoll,
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/* mmap */ nommap,
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/* strategy */ nostrategy,
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/* name */ "openfirm",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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/* kqfilter */ nokqfilter
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};
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static phandle_t lastnode; /* speed hack */
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static int openfirm_checkid(phandle_t, phandle_t);
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static int openfirm_getstr(int, const char *, char **);
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/* Maximum accepted name length. */
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#define OFW_NAME_MAX 8191
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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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openfirm_checkid(phandle_t sid, phandle_t tid)
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{
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for (; sid != 0; sid = OF_peer(sid))
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if (sid == tid || openfirm_checkid(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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openfirm_getstr(int len, const 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 > OFW_NAME_MAX)
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return (ENAMETOOLONG);
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*cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
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if (cp == NULL)
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return (ENOMEM);
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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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openfirm_ioctl(dev_t dev, u_long cmd, caddr_t data, int flags,
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struct thread *td)
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{
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struct ofiocdesc *of;
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phandle_t node;
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int len, ok, error;
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char *name, *value;
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char newname[32];
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of = (struct ofiocdesc *)data;
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switch (cmd) {
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case OFIOCGETOPTNODE:
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*(phandle_t *) data = OF_finddevice("/options");
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return (0);
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case OFIOCGET:
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#if 0
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case OFIOCSET:
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#endif
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case OFIOCNEXTPROP:
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case OFIOCFINDDEVICE:
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node = of->of_nodeid;
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break;
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case OFIOCGETNEXT:
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case OFIOCGETCHILD:
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node = *(phandle_t *)data;
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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 (node != 0 && node != lastnode) {
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/* Not an easy one, must search for it */
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ok = openfirm_checkid(OF_peer(0), node);
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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 = openfirm_getstr(of->of_namelen, of->of_name, &name);
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if (error)
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break;
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len = OF_getproplen(node, name);
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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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len = OF_getprop(node, name, (void *)value, len);
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error = copyout(value, of->of_buf, len);
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break;
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#if 0
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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 = openfirm_getstr(of->of_namelen, of->of_name, &name);
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if (error)
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break;
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error = openfirm_getstr(of->of_buflen, of->of_buf, &value);
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if (error)
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break;
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len = OF_setprop(node, name, value, of->of_buflen);
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if (len != of->of_buflen)
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error = EINVAL;
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break;
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#endif
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case OFIOCNEXTPROP:
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if ((flags & FREAD) == 0)
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return (EBADF);
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if (node == 0 || of->of_buflen < 0)
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return (EINVAL);
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if (of->of_namelen != 0) {
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error = openfirm_getstr(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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ok = OF_nextprop(node, name, newname);
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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) + 1;
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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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case OFIOCGETNEXT:
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if ((flags & FREAD) == 0)
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return (EBADF);
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node = OF_peer(node);
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*(phandle_t *)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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node = OF_child(node);
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*(phandle_t *)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 = openfirm_getstr(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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}
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if (name != NULL)
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free(name, M_TEMP);
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if (value != NULL)
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free(value, M_TEMP);
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return (error);
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}
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static int
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openfirm_modevent(module_t mod, int type, void *data)
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{
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switch(type) {
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case MOD_LOAD:
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if (bootverbose)
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printf("openfirm: <OpenFirmware control device>\n");
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/*
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* Allow only root access by default; this device may allow
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* users to peek into firmware passwords, and likely to crash
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* the machine on some boxen due to firmware quirks.
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*/
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openfirm_dev = make_dev(&openfirm_cdevsw, OPENFIRM_MINOR,
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UID_ROOT, GID_WHEEL, 0600, "openfirm");
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return 0;
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case MOD_UNLOAD:
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destroy_dev(openfirm_dev);
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return 0;
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case MOD_SHUTDOWN:
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return 0;
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default:
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return EOPNOTSUPP;
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}
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}
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DEV_MODULE(openfirm, openfirm_modevent, NULL);
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81
sys/dev/ofw/openfirmio.h
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81
sys/dev/ofw/openfirmio.h
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@ -0,0 +1,81 @@
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/* $NetBSD: openfirmio.h,v 1.4 2002/09/06 13:23:19 gehenna 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. 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, Berkeley and its contributors.
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* 4. 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
|
||||
* 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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* @(#)openpromio.h 8.1 (Berkeley) 6/11/93
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_OFW_OPENFIRMIO_H_
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#define _DEV_OFW_OPENFIRMIO_H_
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#include <dev/ofw/openfirm.h>
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struct ofiocdesc {
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phandle_t of_nodeid; /* passed or returned node id */
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int of_namelen; /* length of op_name */
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const char *of_name; /* pointer to field name */
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int of_buflen; /* length of op_buf (value-result) */
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char *of_buf; /* pointer to field value */
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};
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#define OFIOC_BASE 'O'
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/* Get openprom field. */
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#define OFIOCGET _IOWR(OFIOC_BASE, 1, struct ofiocdesc)
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#if 0
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/* Set openprom field. */
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#define OFIOCSET _IOW(OFIOC_BASE, 2, struct ofiocdesc)
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#endif
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/* Get next property. */
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#define OFIOCNEXTPROP _IOWR(OFIOC_BASE, 3, struct ofiocdesc)
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/* Get options node. */
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#define OFIOCGETOPTNODE _IOR(OFIOC_BASE, 4, phandle_t)
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/* Get next node of node. */
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#define OFIOCGETNEXT _IOWR(OFIOC_BASE, 5, phandle_t)
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/* Get first child of node. */
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#define OFIOCGETCHILD _IOWR(OFIOC_BASE, 6, phandle_t)
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/* Find a specific device. */
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#define OFIOCFINDDEVICE _IOWR(OFIOC_BASE, 7, struct ofiocdesc)
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#endif /* _DEV_OFW_OPENFIRMIO_H_ */
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