1 /* $NetBSD: openfirmio.c,v 1.4 2002/09/06 13:23:19 gehenna Exp $ */ 2 3 #include <sys/cdefs.h> 4 __FBSDID("$FreeBSD$"); 5 6 /* 7 * Copyright (c) 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * This software was developed by the Computer Systems Engineering group 11 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 12 * contributed to Berkeley. 13 * 14 * All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Lawrence Berkeley Laboratory. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * @(#)openfirm.c 8.1 (Berkeley) 6/11/93 44 * 45 */ 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/conf.h> 50 #include <sys/errno.h> 51 #include <sys/fcntl.h> 52 #include <sys/ioccom.h> 53 #include <sys/kernel.h> 54 #include <sys/malloc.h> 55 #include <sys/module.h> 56 57 #include <dev/ofw/openfirmio.h> 58 59 static dev_t openfirm_dev; 60 61 static d_ioctl_t openfirm_ioctl; 62 63 #define OPENFIRM_MINOR 0 64 65 static struct cdevsw openfirm_cdevsw = { 66 .d_version = D_VERSION, 67 .d_flags = D_NEEDGIANT, 68 .d_ioctl = openfirm_ioctl, 69 .d_name = "openfirm", 70 }; 71 72 static phandle_t lastnode; /* speed hack */ 73 74 static int openfirm_checkid(phandle_t, phandle_t); 75 static int openfirm_getstr(int, const char *, char **); 76 77 /* Maximum accepted name length. */ 78 #define OFW_NAME_MAX 8191 79 80 /* 81 * Verify target ID is valid (exists in the OPENPROM tree), as 82 * listed from node ID sid forward. 83 */ 84 static int 85 openfirm_checkid(phandle_t sid, phandle_t tid) 86 { 87 88 for (; sid != 0; sid = OF_peer(sid)) 89 if (sid == tid || openfirm_checkid(OF_child(sid), tid)) 90 return (1); 91 92 return (0); 93 } 94 95 static int 96 openfirm_getstr(int len, const char *user, char **cpp) 97 { 98 int error; 99 char *cp; 100 101 /* Reject obvious bogus requests */ 102 if ((u_int)len > OFW_NAME_MAX) 103 return (ENAMETOOLONG); 104 105 *cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK); 106 if (cp == NULL) 107 return (ENOMEM); 108 error = copyin(user, cp, len); 109 cp[len] = '\0'; 110 return (error); 111 } 112 113 int 114 openfirm_ioctl(dev_t dev, u_long cmd, caddr_t data, int flags, 115 struct thread *td) 116 { 117 struct ofiocdesc *of; 118 phandle_t node; 119 int len, ok, error; 120 char *name, *value; 121 char newname[32]; 122 123 if ((flags & FREAD) == 0) 124 return (EBADF); 125 126 of = (struct ofiocdesc *)data; 127 switch (cmd) { 128 case OFIOCGETOPTNODE: 129 *(phandle_t *) data = OF_finddevice("/options"); 130 return (0); 131 case OFIOCGET: 132 #if 0 133 case OFIOCSET: 134 #endif 135 case OFIOCNEXTPROP: 136 case OFIOCFINDDEVICE: 137 case OFIOCGETPROPLEN: 138 node = of->of_nodeid; 139 break; 140 case OFIOCGETNEXT: 141 case OFIOCGETCHILD: 142 node = *(phandle_t *)data; 143 break; 144 default: 145 return (ENOIOCTL); 146 } 147 148 if (node != 0 && node != lastnode) { 149 /* Not an easy one, must search for it */ 150 ok = openfirm_checkid(OF_peer(0), node); 151 if (!ok) 152 return (EINVAL); 153 lastnode = node; 154 } 155 156 name = value = NULL; 157 error = 0; 158 switch (cmd) { 159 160 case OFIOCGET: 161 case OFIOCGETPROPLEN: 162 if (node == 0) 163 return (EINVAL); 164 error = openfirm_getstr(of->of_namelen, of->of_name, &name); 165 if (error) 166 break; 167 len = OF_getproplen(node, name); 168 if (cmd == OFIOCGETPROPLEN) { 169 of->of_buflen = len; 170 break; 171 } 172 if (len > of->of_buflen) { 173 error = ENOMEM; 174 break; 175 } 176 of->of_buflen = len; 177 /* -1 means no entry; 0 means no value */ 178 if (len <= 0) 179 break; 180 value = malloc(len, M_TEMP, M_WAITOK); 181 if (value == NULL) { 182 error = ENOMEM; 183 break; 184 } 185 len = OF_getprop(node, name, (void *)value, len); 186 error = copyout(value, of->of_buf, len); 187 break; 188 189 #if 0 190 case OFIOCSET: 191 if ((flags & FWRITE) == 0) 192 return (EBADF); 193 if (node == 0) 194 return (EINVAL); 195 error = openfirm_getstr(of->of_namelen, of->of_name, &name); 196 if (error) 197 break; 198 error = openfirm_getstr(of->of_buflen, of->of_buf, &value); 199 if (error) 200 break; 201 len = OF_setprop(node, name, value, of->of_buflen); 202 if (len != of->of_buflen) 203 error = EINVAL; 204 break; 205 #endif 206 207 case OFIOCNEXTPROP: 208 if (node == 0 || of->of_buflen < 0) 209 return (EINVAL); 210 if (of->of_namelen != 0) { 211 error = openfirm_getstr(of->of_namelen, of->of_name, 212 &name); 213 if (error) 214 break; 215 } 216 ok = OF_nextprop(node, name, newname); 217 if (ok == 0) { 218 error = ENOENT; 219 break; 220 } 221 if (ok == -1) { 222 error = EINVAL; 223 break; 224 } 225 len = strlen(newname) + 1; 226 if (len > of->of_buflen) 227 len = of->of_buflen; 228 else 229 of->of_buflen = len; 230 error = copyout(newname, of->of_buf, len); 231 break; 232 233 case OFIOCGETNEXT: 234 node = OF_peer(node); 235 *(phandle_t *)data = lastnode = node; 236 break; 237 238 case OFIOCGETCHILD: 239 if (node == 0) 240 return (EINVAL); 241 node = OF_child(node); 242 *(phandle_t *)data = lastnode = node; 243 break; 244 245 case OFIOCFINDDEVICE: 246 error = openfirm_getstr(of->of_namelen, of->of_name, &name); 247 if (error) 248 break; 249 node = OF_finddevice(name); 250 if (node == 0 || node == -1) { 251 error = ENOENT; 252 break; 253 } 254 of->of_nodeid = lastnode = node; 255 break; 256 } 257 258 if (name != NULL) 259 free(name, M_TEMP); 260 if (value != NULL) 261 free(value, M_TEMP); 262 263 return (error); 264 } 265 266 static int 267 openfirm_modevent(module_t mod, int type, void *data) 268 { 269 switch(type) { 270 case MOD_LOAD: 271 if (bootverbose) 272 printf("openfirm: <OpenFirmware control device>\n"); 273 /* 274 * Allow only root access by default; this device may allow 275 * users to peek into firmware passwords, and likely to crash 276 * the machine on some boxen due to firmware quirks. 277 */ 278 openfirm_dev = make_dev(&openfirm_cdevsw, OPENFIRM_MINOR, 279 UID_ROOT, GID_WHEEL, 0600, "openfirm"); 280 return 0; 281 282 case MOD_UNLOAD: 283 destroy_dev(openfirm_dev); 284 return 0; 285 286 case MOD_SHUTDOWN: 287 return 0; 288 289 default: 290 return EOPNOTSUPP; 291 } 292 } 293 294 DEV_MODULE(openfirm, openfirm_modevent, NULL); 295