devicename.c revision 237766
1/*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/9/sys/boot/i386/libi386/devicename.c 237766 2012-06-29 10:19:15Z avg $"); 29 30#include <stand.h> 31#include <string.h> 32#include <sys/disklabel.h> 33#include "bootstrap.h" 34#include "libi386.h" 35#include "../zfs/libzfs.h" 36 37static int i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path); 38 39/* 40 * Point (dev) at an allocated device specifier for the device matching the 41 * path in (devspec). If it contains an explicit device specification, 42 * use that. If not, use the default device. 43 */ 44int 45i386_getdev(void **vdev, const char *devspec, const char **path) 46{ 47 struct i386_devdesc **dev = (struct i386_devdesc **)vdev; 48 int rv; 49 50 /* 51 * If it looks like this is just a path and no 52 * device, go with the current device. 53 */ 54 if ((devspec == NULL) || 55 (devspec[0] == '/') || 56 (strchr(devspec, ':') == NULL)) { 57 58 if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) && 59 (path != NULL)) 60 *path = devspec; 61 return(rv); 62 } 63 64 /* 65 * Try to parse the device name off the beginning of the devspec 66 */ 67 return(i386_parsedev(dev, devspec, path)); 68} 69 70/* 71 * Point (dev) at an allocated device specifier matching the string version 72 * at the beginning of (devspec). Return a pointer to the remaining 73 * text in (path). 74 * 75 * In all cases, the beginning of (devspec) is compared to the names 76 * of known devices in the device switch, and then any following text 77 * is parsed according to the rules applied to the device type. 78 * 79 * For disk-type devices, the syntax is: 80 * 81 * disk<unit>[s<slice>][<partition>]: 82 * 83 */ 84static int 85i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path) 86{ 87 struct i386_devdesc *idev; 88 struct devsw *dv; 89 int i, unit, slice, partition, err; 90 char *cp; 91 const char *np; 92 93 /* minimum length check */ 94 if (strlen(devspec) < 2) 95 return(EINVAL); 96 97 /* look for a device that matches */ 98 for (i = 0, dv = NULL; devsw[i] != NULL; i++) { 99 if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) { 100 dv = devsw[i]; 101 break; 102 } 103 } 104 if (dv == NULL) 105 return(ENOENT); 106 idev = malloc(sizeof(struct i386_devdesc)); 107 err = 0; 108 np = (devspec + strlen(dv->dv_name)); 109 110 switch(dv->dv_type) { 111 case DEVT_NONE: /* XXX what to do here? Do we care? */ 112 break; 113 114 case DEVT_DISK: 115 unit = -1; 116 slice = -1; 117 partition = -1; 118 if (*np && (*np != ':')) { 119 unit = strtol(np, &cp, 10); /* next comes the unit number */ 120 if (cp == np) { 121 err = EUNIT; 122 goto fail; 123 } 124#ifdef LOADER_GPT_SUPPORT 125 if (*cp == 'p') { /* got a GPT partition */ 126 np = cp + 1; 127 slice = strtol(np, &cp, 10); 128 if (cp == np) { 129 err = ESLICE; 130 goto fail; 131 } 132 if (*cp && (*cp != ':')) { 133 err = EINVAL; 134 goto fail; 135 } 136 partition = 0xff; 137 } else { 138#endif 139 if (*cp == 's') { /* got a slice number */ 140 np = cp + 1; 141 slice = strtol(np, &cp, 10); 142 if (cp == np) { 143 err = ESLICE; 144 goto fail; 145 } 146 } 147 if (*cp && (*cp != ':')) { 148 partition = *cp - 'a'; /* got a partition number */ 149 if ((partition < 0) || (partition >= MAXPARTITIONS)) { 150 err = EPART; 151 goto fail; 152 } 153 cp++; 154 } 155#ifdef LOADER_GPT_SUPPORT 156 } 157#endif 158 } else { 159 cp = np; 160 } 161 if (*cp && (*cp != ':')) { 162 err = EINVAL; 163 goto fail; 164 } 165 166 idev->d_unit = unit; 167 idev->d_kind.biosdisk.slice = slice; 168 idev->d_kind.biosdisk.partition = partition; 169 if (path != NULL) 170 *path = (*cp == 0) ? cp : cp + 1; 171 break; 172 173 case DEVT_CD: 174 case DEVT_NET: 175 unit = 0; 176 177 if (*np && (*np != ':')) { 178 unit = strtol(np, &cp, 0); /* get unit number if present */ 179 if (cp == np) { 180 err = EUNIT; 181 goto fail; 182 } 183 } else { 184 cp = np; 185 } 186 if (*cp && (*cp != ':')) { 187 err = EINVAL; 188 goto fail; 189 } 190 191 idev->d_unit = unit; 192 if (path != NULL) 193 *path = (*cp == 0) ? cp : cp + 1; 194 break; 195 case DEVT_ZFS: 196 err = zfs_parsedev((struct zfs_devdesc *)idev, np, path); 197 if (err != 0) 198 goto fail; 199 break; 200 default: 201 err = EINVAL; 202 goto fail; 203 } 204 idev->d_dev = dv; 205 idev->d_type = dv->dv_type; 206 if (dev == NULL) { 207 free(idev); 208 } else { 209 *dev = idev; 210 } 211 return(0); 212 213 fail: 214 free(idev); 215 return(err); 216} 217 218 219char * 220i386_fmtdev(void *vdev) 221{ 222 struct i386_devdesc *dev = (struct i386_devdesc *)vdev; 223 static char buf[128]; /* XXX device length constant? */ 224 char *cp; 225 226 switch(dev->d_type) { 227 case DEVT_NONE: 228 strcpy(buf, "(no device)"); 229 break; 230 231 case DEVT_CD: 232 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 233 break; 234 235 case DEVT_DISK: 236 cp = buf; 237 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_unit); 238#ifdef LOADER_GPT_SUPPORT 239 if (dev->d_kind.biosdisk.partition == 0xff) { 240 cp += sprintf(cp, "p%d", dev->d_kind.biosdisk.slice); 241 } else { 242#endif 243 if (dev->d_kind.biosdisk.slice > 0) 244 cp += sprintf(cp, "s%d", dev->d_kind.biosdisk.slice); 245 if (dev->d_kind.biosdisk.partition >= 0) 246 cp += sprintf(cp, "%c", dev->d_kind.biosdisk.partition + 'a'); 247#ifdef LOADER_GPT_SUPPORT 248 } 249#endif 250 strcat(cp, ":"); 251 break; 252 253 case DEVT_NET: 254 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 255 break; 256 case DEVT_ZFS: 257 return(zfs_fmtdev(vdev)); 258 } 259 return(buf); 260} 261 262 263/* 264 * Set currdev to suit the value being supplied in (value) 265 */ 266int 267i386_setcurrdev(struct env_var *ev, int flags, const void *value) 268{ 269 struct i386_devdesc *ncurr; 270 int rv; 271 272 if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0) 273 return(rv); 274 free(ncurr); 275 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 276 return(0); 277} 278