1 /* $NetBSD: devicename.c,v 1.8 2014/04/08 21:51:06 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 31 /* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/devicename.c,v 1.3 2004/01/04 23:28:16 obrien Exp $"); */ 32 33 #include <lib/libsa/stand.h> 34 #include <lib/libsa/loadfile.h> 35 #include <lib/libkern/libkern.h> 36 #include <sys/disklabel.h> 37 38 #include <bootstrap.h> 39 40 #include <efi.h> 41 #include <efilib.h> 42 #include "efiboot.h" 43 44 static int efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path); 45 46 /* 47 * Point (dev) at an allocated device specifier for the device matching the 48 * path in (devspec). If it contains an explicit device specification, 49 * use that. If not, use the default device. 50 */ 51 int 52 efi_getdev(void **vdev, const char *devspec, const char **path) 53 { 54 struct efi_devdesc **dev = (struct efi_devdesc **)vdev; 55 int rv; 56 57 /* 58 * If it looks like this is just a path and no 59 * device, go with the current device. 60 */ 61 if ((devspec == NULL) || 62 (devspec[0] == '/') || 63 (strchr(devspec, ':') == NULL)) { 64 65 if (((rv = efi_parsedev(dev, getenv("currdev"), NULL)) == 0) && 66 (path != NULL)) 67 *path = devspec; 68 return(rv); 69 } 70 71 /* 72 * Try to parse the device name off the beginning of the devspec 73 */ 74 return(efi_parsedev(dev, devspec, path)); 75 } 76 77 /* 78 * Point (dev) at an allocated device specifier matching the string version 79 * at the beginning of (devspec). Return a pointer to the remaining 80 * text in (path). 81 * 82 * In all cases, the beginning of (devspec) is compared to the names 83 * of known devices in the device switch, and then any following text 84 * is parsed according to the rules applied to the device type. 85 * 86 * For disk-type devices, the syntax is: 87 * 88 * disk<unit>[s<slice>][<partition>]: 89 * 90 */ 91 static int 92 efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path) 93 { 94 struct efi_devdesc *idev; 95 struct devsw *dv; 96 int dv_type; 97 int i, unit, slice, partition, err; 98 char *cp; 99 const char *np; 100 101 /* minimum length check */ 102 if (strlen(devspec) < 2) 103 return(EINVAL); 104 105 /* look for a device that matches */ 106 for (i = 0, dv = NULL; i < ndevs; i++) { 107 if (!strncmp(devspec, devsw[i].dv_name, strlen(devsw[i].dv_name))) { 108 dv = &devsw[i]; 109 break; 110 } 111 } 112 113 if (dv == NULL) 114 return(ENOENT); 115 idev = alloc(sizeof(struct efi_devdesc)); 116 err = 0; 117 np = (devspec + strlen(dv->dv_name)); 118 119 dv_type = DEVT_NONE; 120 if (!strncmp("disk", dv->dv_name, 4)) dv_type = DEVT_DISK; 121 if (!strncmp("net", dv->dv_name, 3)) dv_type = DEVT_DISK; 122 123 switch(dv_type) { 124 case DEVT_NONE: /* XXX what to do here? Do we care? */ 125 break; 126 127 case DEVT_DISK: 128 unit = -1; 129 slice = -1; 130 partition = -1; 131 if (*np && (*np != ':')) { 132 unit = strtol(np, &cp, 10); /* next comes the unit number */ 133 if (cp == np) { 134 err = EUNIT; 135 goto fail; 136 } 137 if (*cp == 's') { /* got a slice number */ 138 np = cp + 1; 139 slice = strtol(np, &cp, 10); 140 if (cp == np) { 141 err = EPART; /* XXX : NetBSD calls a FreeBSD SLICE, a Partition! */ 142 goto fail; 143 } 144 } 145 if (*cp && (*cp != ':')) { 146 partition = *cp - 'a'; /* get a partition number */ 147 if ((partition < 0) || (partition >= MAXPARTITIONS)) { 148 err = EPART; 149 goto fail; 150 } 151 cp++; 152 } 153 } 154 if (*cp && (*cp != ':')) { 155 err = EINVAL; 156 goto fail; 157 } 158 159 idev->d_kind.efidisk.unit = unit; 160 idev->d_kind.efidisk.slice = slice; 161 idev->d_kind.efidisk.partition = partition; 162 163 if (path != NULL) 164 *path = (*cp == 0) ? cp : cp + 1; 165 break; 166 167 case DEVT_NET: 168 unit = 0; 169 170 if (*np && (*np != ':')) { 171 unit = strtol(np, &cp, 0); /* get unit number if present */ 172 if (cp == np) { 173 err = EUNIT; 174 goto fail; 175 } 176 } 177 if (*cp && (*cp != ':')) { 178 err = EINVAL; 179 goto fail; 180 } 181 182 idev->d_kind.netif.unit = unit; 183 if (path != NULL) 184 *path = (*cp == 0) ? cp : cp + 1; 185 break; 186 187 default: 188 err = EINVAL; 189 goto fail; 190 } 191 idev->d_dev = dv; 192 idev->d_type = dv_type; 193 if (dev == NULL) { 194 free(idev); 195 } else { 196 *dev = idev; 197 } 198 return(0); 199 200 fail: 201 free(idev); 202 return(err); 203 } 204 205 206 char * 207 efi_fmtdev(void *vdev) 208 { 209 struct efi_devdesc *dev = (struct efi_devdesc *)vdev; 210 static char buf[128]; /* XXX device length constant? */ 211 size_t len, buflen = sizeof(buf); 212 213 switch(dev->d_type) { 214 case DEVT_NONE: 215 strlcpy(buf, "(no device)", sizeof(buf)); 216 break; 217 218 case DEVT_DISK: 219 len = snprintf(buf, buflen, "%s%d", dev->d_dev->dv_name, dev->d_kind.efidisk.unit); 220 if (len > buflen) 221 len = buflen; 222 if (dev->d_kind.efidisk.slice > 0) { 223 len += snprintf(buf + len, buflen - len, "s%d", dev->d_kind.efidisk.slice); 224 if (len > buflen) 225 len = buflen; 226 } 227 if (dev->d_kind.efidisk.partition >= 0) { 228 len += snprintf(buf + len, buflen - len, "%c", dev->d_kind.efidisk.partition + 'a'); 229 if (len > buflen) 230 len = buflen; 231 } 232 strlcat(buf, ":", sizeof(buf) - len); 233 break; 234 235 case DEVT_NET: 236 snprintf(buf, buflen, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit); 237 break; 238 } 239 return(buf); 240 } 241 242 243 /* 244 * Set currdev to suit the value being supplied in (value) 245 */ 246 int 247 efi_setcurrdev(struct env_var *ev, int flags, void *value) 248 { 249 struct efi_devdesc *ncurr; 250 int rv; 251 252 if ((rv = efi_parsedev(&ncurr, value, NULL)) != 0) 253 return(rv); 254 free(ncurr); 255 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 256 return(0); 257 } 258 259