devicename.c revision 185099
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: head/sys/boot/uboot/lib/devicename.c 185099 2008-11-19 17:34:28Z raj $"); 29 30#include <sys/disklabel.h> 31 32#include <stand.h> 33#include <string.h> 34 35#include "bootstrap.h" 36#include "libuboot.h" 37 38static int uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, const char **path); 39 40/* 41 * Point (dev) at an allocated device specifier for the device matching the 42 * path in (devspec). If it contains an explicit device specification, 43 * use that. If not, use the default device. 44 */ 45int 46uboot_getdev(void **vdev, const char *devspec, const char **path) 47{ 48 struct uboot_devdesc **dev = (struct uboot_devdesc **)vdev; 49 int rv; 50 51 /* 52 * If it looks like this is just a path and no 53 * device, go with the current device. 54 */ 55 if ((devspec == NULL) || (devspec[0] == '/') || 56 (strchr(devspec, ':') == NULL)) { 57 58 if (((rv = uboot_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 (uboot_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>[<partition>]: 82 * 83 */ 84static int 85uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 86 const char **path) 87{ 88 struct uboot_devdesc *idev; 89 struct devsw *dv; 90 char *cp; 91 const char *np; 92 int i, unit, partition, err; 93 94 /* minimum length check */ 95 if (strlen(devspec) < 2) 96 return(EINVAL); 97 98 /* look for a device that matches */ 99 for (i = 0, dv = NULL; devsw[i] != NULL; i++) { 100 if (!strncmp(devspec, devsw[i]->dv_name, 101 strlen(devsw[i]->dv_name))) { 102 dv = devsw[i]; 103 break; 104 } 105 } 106 if (dv == NULL) 107 return(ENOENT); 108 idev = malloc(sizeof(struct uboot_devdesc)); 109 err = 0; 110 np = (devspec + strlen(dv->dv_name)); 111 112 switch(dv->dv_type) { 113 case DEVT_NONE: 114 break; 115 116 case DEVT_DISK: 117 unit = -1; 118 partition = -1; 119 if (*np && (*np != ':')) { 120 /* next comes the unit number */ 121 unit = strtol(np, &cp, 10); 122 if (cp == np) { 123 err = EUNIT; 124 goto fail; 125 } 126 if (*cp && (*cp != ':')) { 127 /* get partition */ 128 partition = *cp - 'a'; 129 if ((partition < 0) || 130 (partition >= MAXPARTITIONS)) { 131 err = EPART; 132 goto fail; 133 } 134 cp++; 135 } 136 } 137 if (*cp && (*cp != ':')) { 138 err = EINVAL; 139 goto fail; 140 } 141 142 idev->d_unit = unit; 143 idev->d_disk.partition = partition; 144 idev->d_disk.data = NULL; 145 if (path != NULL) 146 *path = (*cp == 0) ? cp : cp + 1; 147 break; 148 149 case DEVT_NET: 150 unit = 0; 151 152 if (*np && (*np != ':')) { 153 /* get unit number if present */ 154 unit = strtol(np, &cp, 0); 155 if (cp == np) { 156 err = EUNIT; 157 goto fail; 158 } 159 } 160 if (*cp && (*cp != ':')) { 161 err = EINVAL; 162 goto fail; 163 } 164 idev->d_unit = unit; 165 166 if (path != NULL) 167 *path = (*cp == 0) ? cp : cp + 1; 168 break; 169 170 default: 171 err = EINVAL; 172 goto fail; 173 } 174 idev->d_dev = dv; 175 idev->d_type = dv->dv_type; 176 if (dev == NULL) { 177 free(idev); 178 } else { 179 *dev = idev; 180 } 181 return(0); 182 183fail: 184 free(idev); 185 return(err); 186} 187 188 189char * 190uboot_fmtdev(void *vdev) 191{ 192 struct uboot_devdesc *dev = (struct uboot_devdesc *)vdev; 193 char *cp; 194 static char buf[128]; /* XXX device length constant? */ 195 196 switch(dev->d_type) { 197 case DEVT_NONE: 198 strcpy(buf, "(no device)"); 199 break; 200 201 case DEVT_DISK: 202 cp = buf; 203 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_unit); 204 if (dev->d_kind.disk.partition >= 0) 205 cp += sprintf(cp, "%c", dev->d_kind.disk.partition + 206 'a'); 207 strcat(cp, ":"); 208 break; 209 210 case DEVT_NET: 211 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 212 break; 213 } 214 return(buf); 215} 216 217/* 218 * Set currdev to suit the value being supplied in (value). 219 */ 220int 221uboot_setcurrdev(struct env_var *ev, int flags, const void *value) 222{ 223 struct uboot_devdesc *ncurr; 224 int rv; 225 226 if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0) 227 return(rv); 228 free(ncurr); 229 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 230 return(0); 231} 232