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 * $FreeBSD: src/sys/boot/i386/libi386/devicename.c,v 1.6 2003/08/25 23:28:31 obrien Exp $ 27 * $DragonFly: src/sys/boot/pc32/libi386/devicename.c,v 1.4 2007/06/18 05:13:42 dillon Exp $ 28 */ 29 30 #include <stand.h> 31 #include <string.h> 32 #include <sys/disklabel32.h> 33 #include "bootstrap.h" 34 #include "libi386.h" 35 36 static int i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path); 37 38 /* 39 * Point (dev) at an allocated device specifier for the device matching the 40 * path in (devspec). If it contains an explicit device specification, 41 * use that. If not, use the default device. 42 */ 43 int 44 i386_getdev(void **vdev, const char *devspec, const char **path) 45 { 46 struct i386_devdesc **dev = (struct i386_devdesc **)vdev; 47 int rv; 48 49 /* 50 * If it looks like this is just a path and no 51 * device, go with the current device. 52 */ 53 if ((devspec == NULL) || 54 (devspec[0] == '/') || 55 (strchr(devspec, ':') == NULL)) { 56 57 if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) && 58 (path != NULL)) 59 *path = devspec; 60 return(rv); 61 } 62 63 /* 64 * Try to parse the device name off the beginning of the devspec 65 */ 66 return(i386_parsedev(dev, devspec, path)); 67 } 68 69 /* 70 * Point (dev) at an allocated device specifier matching the string version 71 * at the beginning of (devspec). Return a pointer to the remaining 72 * text in (path). 73 * 74 * In all cases, the beginning of (devspec) is compared to the names 75 * of known devices in the device switch, and then any following text 76 * is parsed according to the rules applied to the device type. 77 * 78 * For disk-type devices, the syntax is: 79 * 80 * disk<unit>[s<slice>][<partition>]: 81 * 82 */ 83 static int 84 i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path) 85 { 86 struct i386_devdesc *idev; 87 struct devsw *dv; 88 int i, unit, slice, partition, err; 89 char *cp; 90 const char *np; 91 92 /* minimum length check */ 93 if (strlen(devspec) < 2) 94 return(EINVAL); 95 96 /* look for a device that matches */ 97 for (i = 0, dv = NULL; devsw[i] != NULL; i++) { 98 if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) { 99 dv = devsw[i]; 100 break; 101 } 102 } 103 if (dv == NULL) 104 return(ENOENT); 105 idev = malloc(sizeof(struct i386_devdesc)); 106 err = 0; 107 np = (devspec + strlen(dv->dv_name)); 108 109 switch(dv->dv_type) { 110 case DEVT_NONE: /* XXX what to do here? Do we care? */ 111 break; 112 113 case DEVT_DISK: 114 unit = -1; 115 slice = -1; 116 partition = -1; 117 if (*np && (*np != ':')) { 118 unit = strtol(np, &cp, 10); /* next comes the unit number */ 119 if (cp == np) { 120 err = EUNIT; 121 goto fail; 122 } 123 if (*cp == 's') { /* got a slice number */ 124 np = cp + 1; 125 slice = strtol(np, &cp, 10); 126 if (cp == np) { 127 err = ESLICE; 128 goto fail; 129 } 130 } 131 if (*cp && (*cp != ':')) { 132 partition = *cp - 'a'; /* get a partition number */ 133 if ((partition < 0) || (partition >= MAXPARTITIONS32)) { 134 err = EPART; 135 goto fail; 136 } 137 cp++; 138 } 139 } 140 if (*cp && (*cp != ':')) { 141 err = EINVAL; 142 goto fail; 143 } 144 145 idev->d_kind.biosdisk.unit = unit; 146 idev->d_kind.biosdisk.slice = slice; 147 idev->d_kind.biosdisk.partition = partition; 148 if (path != NULL) 149 *path = (*cp == 0) ? cp : cp + 1; 150 break; 151 152 case DEVT_CD: 153 case DEVT_NET: 154 unit = 0; 155 156 if (*np && (*np != ':')) { 157 unit = strtol(np, &cp, 0); /* get unit number if present */ 158 if (cp == np) { 159 err = EUNIT; 160 goto fail; 161 } 162 } 163 if (*cp && (*cp != ':')) { 164 err = EINVAL; 165 goto fail; 166 } 167 168 if (dv->dv_type == DEVT_NET) 169 idev->d_kind.netif.unit = unit; 170 else 171 idev->d_kind.bioscd.unit = unit; 172 if (path != NULL) 173 *path = (*cp == 0) ? cp : cp + 1; 174 break; 175 176 default: 177 err = EINVAL; 178 goto fail; 179 } 180 idev->d_dev = dv; 181 idev->d_type = dv->dv_type; 182 if (dev == NULL) { 183 free(idev); 184 } else { 185 *dev = idev; 186 } 187 return(0); 188 189 fail: 190 free(idev); 191 return(err); 192 } 193 194 195 char * 196 i386_fmtdev(void *vdev) 197 { 198 struct i386_devdesc *dev = (struct i386_devdesc *)vdev; 199 static char buf[128]; /* XXX device length constant? */ 200 char *cp; 201 202 switch(dev->d_type) { 203 case DEVT_NONE: 204 strcpy(buf, "(no device)"); 205 break; 206 207 case DEVT_CD: 208 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.bioscd.unit); 209 break; 210 211 case DEVT_DISK: 212 cp = buf; 213 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.biosdisk.unit); 214 if (dev->d_kind.biosdisk.slice > 0) 215 cp += sprintf(cp, "s%d", dev->d_kind.biosdisk.slice); 216 if (dev->d_kind.biosdisk.partition >= 0) 217 cp += sprintf(cp, "%c", dev->d_kind.biosdisk.partition + 'a'); 218 strcat(cp, ":"); 219 break; 220 221 case DEVT_NET: 222 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit); 223 break; 224 } 225 return(buf); 226 } 227 228 229 /* 230 * Set currdev to suit the value being supplied in (value) 231 */ 232 int 233 i386_setcurrdev(struct env_var *ev, int flags, const void *value) 234 { 235 struct i386_devdesc *ncurr; 236 int rv; 237 238 if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0) 239 return(rv); 240 free(ncurr); 241 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 242 return(0); 243 } 244 245