1 /* $NetBSD: openfirmio.c,v 1.4 2002/09/06 13:23:19 gehenna Exp $ */
7 * SPDX-License-Identifier: BSD-3-Clause
9 * Copyright (c) 1992, 1993
10 * The Regents of the University of California. All rights reserved.
12 * This software was developed by the Computer Systems Engineering group
13 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
14 * contributed to Berkeley.
16 * All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Lawrence Berkeley Laboratory.
21 * Redistribution and use in source and binary forms, with or without
22 * modification, are permitted provided that the following conditions
24 * 1. Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in the
28 * documentation and/or other materials provided with the distribution.
29 * 3. Neither the name of the University nor the names of its contributors
30 * may be used to endorse or promote products derived from this software
31 * without specific prior written permission.
33 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
45 * @(#)openfirm.c 8.1 (Berkeley) 6/11/93
49 #include <sys/param.h>
50 #include <sys/systm.h>
52 #include <sys/errno.h>
53 #include <sys/fcntl.h>
54 #include <sys/ioccom.h>
55 #include <sys/kernel.h>
56 #include <sys/malloc.h>
57 #include <sys/module.h>
59 #include <dev/ofw/openfirmio.h>
61 static struct cdev *openfirm_dev;
63 static d_ioctl_t openfirm_ioctl;
65 #define OPENFIRM_MINOR 0
67 static struct cdevsw openfirm_cdevsw = {
68 .d_version = D_VERSION,
69 .d_flags = D_NEEDGIANT,
70 .d_ioctl = openfirm_ioctl,
74 static phandle_t lastnode; /* speed hack */
76 static int openfirm_checkid(phandle_t, phandle_t);
77 static int openfirm_getstr(int, const char *, char **);
80 * Verify target ID is valid (exists in the OPENPROM tree), as
81 * listed from node ID sid forward.
84 openfirm_checkid(phandle_t sid, phandle_t tid)
87 for (; sid != 0; sid = OF_peer(sid))
88 if (sid == tid || openfirm_checkid(OF_child(sid), tid))
95 openfirm_getstr(int len, const char *user, char **cpp)
100 /* Reject obvious bogus requests. */
101 if ((u_int)len > OFIOCMAXNAME)
102 return (ENAMETOOLONG);
104 *cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
105 error = copyin(user, cp, len);
111 openfirm_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
114 struct ofiocdesc *of;
120 if ((flags & FREAD) == 0)
123 of = (struct ofiocdesc *)data;
125 case OFIOCGETOPTNODE:
126 *(phandle_t *) data = OF_finddevice("/options");
131 case OFIOCFINDDEVICE:
132 case OFIOCGETPROPLEN:
133 node = of->of_nodeid;
137 node = *(phandle_t *)data;
143 if (node != 0 && node != lastnode) {
144 /* Not an easy one, we must search for it. */
145 ok = openfirm_checkid(OF_peer(0), node);
156 case OFIOCGETPROPLEN:
159 error = openfirm_getstr(of->of_namelen, of->of_name, &name);
162 len = OF_getproplen(node, name);
163 if (cmd == OFIOCGETPROPLEN) {
167 if (len > of->of_buflen) {
172 /* -1 means no entry; 0 means no value. */
175 value = malloc(len, M_TEMP, M_WAITOK);
176 len = OF_getprop(node, name, (void *)value, len);
177 error = copyout(value, of->of_buf, len);
182 * Note: Text string values for at least the /options node
183 * have to be null-terminated and the length parameter must
184 * include this terminating null. However, like OF_getprop(),
185 * OF_setprop() will return the actual length of the text
186 * string, i.e. omitting the terminating null.
188 if ((flags & FWRITE) == 0)
192 if ((u_int)of->of_buflen > OFIOCMAXVALUE)
193 return (ENAMETOOLONG);
194 error = openfirm_getstr(of->of_namelen, of->of_name, &name);
197 value = malloc(of->of_buflen, M_TEMP, M_WAITOK);
198 error = copyin(of->of_buf, value, of->of_buflen);
201 len = OF_setprop(node, name, value, of->of_buflen);
208 if (node == 0 || of->of_buflen < 0)
210 if (of->of_namelen != 0) {
211 error = openfirm_getstr(of->of_namelen, of->of_name,
216 ok = OF_nextprop(node, name, newname, sizeof(newname));
225 len = strlen(newname) + 1;
226 if (len > of->of_buflen)
230 error = copyout(newname, of->of_buf, len);
234 node = OF_peer(node);
235 *(phandle_t *)data = lastnode = node;
241 node = OF_child(node);
242 *(phandle_t *)data = lastnode = node;
245 case OFIOCFINDDEVICE:
246 error = openfirm_getstr(of->of_namelen, of->of_name, &name);
249 node = OF_finddevice(name);
254 of->of_nodeid = lastnode = node;
267 openfirm_modevent(module_t mod, int type, void *data)
273 printf("openfirm: <Open Firmware control device>\n");
275 * Allow only root access by default; this device may allow
276 * users to peek into firmware passwords, and likely to crash
277 * the machine on some boxen due to firmware quirks.
279 openfirm_dev = make_dev(&openfirm_cdevsw, OPENFIRM_MINOR,
280 UID_ROOT, GID_WHEEL, 0600, "openfirm");
284 destroy_dev(openfirm_dev);
295 DEV_MODULE(openfirm, openfirm_modevent, NULL);