devicename.c revision 177152
10Sduke/*- 22362Sohair * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 30Sduke * All rights reserved. 40Sduke * 50Sduke * Redistribution and use in source and binary forms, with or without 60Sduke * modification, are permitted provided that the following conditions 70Sduke * are met: 80Sduke * 1. Redistributions of source code must retain the above copyright 90Sduke * notice, this list of conditions and the following disclaimer. 100Sduke * 2. Redistributions in binary form must reproduce the above copyright 110Sduke * notice, this list of conditions and the following disclaimer in the 120Sduke * documentation and/or other materials provided with the distribution. 130Sduke * 140Sduke * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 150Sduke * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 160Sduke * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 170Sduke * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 180Sduke * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 192362Sohair * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 202362Sohair * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 212362Sohair * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 220Sduke * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 230Sduke * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 240Sduke * SUCH DAMAGE. 250Sduke */ 260Sduke 270Sduke#include <sys/cdefs.h> 280Sduke__FBSDID("$FreeBSD: head/sys/boot/uboot/lib/devicename.c 177152 2008-03-13 17:54:21Z obrien $"); 290Sduke 300Sduke#include <sys/disklabel.h> 310Sduke 320Sduke#include <stand.h> 330Sduke#include <string.h> 340Sduke 350Sduke#include "bootstrap.h" 360Sduke#include "libuboot.h" 370Sduke 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>[s<slice>][<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, slice, 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: /* XXX what to do here? Do we care? */ 114 break; 115 116 case DEVT_DISK: 117 unit = -1; 118 slice = -1; 119 partition = -1; 120 if (*np && (*np != ':')) { 121 /* next comes the unit number */ 122 unit = strtol(np, &cp, 10); 123 if (cp == np) { 124 err = EUNIT; 125 goto fail; 126 } 127 if (*cp == 's') { /* got a slice number */ 128 np = cp + 1; 129 slice = strtol(np, &cp, 10); 130 if (cp == np) { 131 err = ESLICE; 132 goto fail; 133 } 134 } 135 if (*cp && (*cp != ':')) { 136 /* get a partition number */ 137 partition = *cp - 'a'; 138 if ((partition < 0) || 139 (partition >= MAXPARTITIONS)) { 140 err = EPART; 141 goto fail; 142 } 143 cp++; 144 } 145 } 146 if (*cp && (*cp != ':')) { 147 err = EINVAL; 148 goto fail; 149 } 150 151 idev->d_unit = unit; 152 idev->d_kind.disk.slice = slice; 153 idev->d_kind.disk.partition = partition; 154 if (path != NULL) 155 *path = (*cp == 0) ? cp : cp + 1; 156 break; 157 158 case DEVT_NET: 159 unit = 0; 160 161 if (*np && (*np != ':')) { 162 /* get unit number if present */ 163 unit = strtol(np, &cp, 0); 164 if (cp == np) { 165 err = EUNIT; 166 goto fail; 167 } 168 } 169 if (*cp && (*cp != ':')) { 170 err = EINVAL; 171 goto fail; 172 } 173 174 if (dv->dv_type == DEVT_NET) 175 idev->d_unit = unit; 176 177 if (path != NULL) 178 *path = (*cp == 0) ? cp : cp + 1; 179 break; 180 181 default: 182 err = EINVAL; 183 goto fail; 184 } 185 idev->d_dev = dv; 186 idev->d_type = dv->dv_type; 187 if (dev == NULL) { 188 free(idev); 189 } else { 190 *dev = idev; 191 } 192 return(0); 193 194fail: 195 free(idev); 196 return(err); 197} 198 199 200char * 201uboot_fmtdev(void *vdev) 202{ 203 struct uboot_devdesc *dev = (struct uboot_devdesc *)vdev; 204 char *cp; 205 static char buf[128]; /* XXX device length constant? */ 206 207 switch(dev->d_type) { 208 case DEVT_NONE: 209 strcpy(buf, "(no device)"); 210 break; 211 212 case DEVT_DISK: 213 cp = buf; 214 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_unit); 215 if (dev->d_kind.disk.slice > 0) 216 cp += sprintf(cp, "s%d", dev->d_kind.disk.slice); 217 if (dev->d_kind.disk.partition >= 0) 218 cp += sprintf(cp, "%c", dev->d_kind.disk.partition + 219 'a'); 220 strcat(cp, ":"); 221 break; 222 223 case DEVT_NET: 224 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 225 break; 226 } 227 return(buf); 228} 229 230/* 231 * Set currdev to suit the value being supplied in (value). 232 */ 233int 234uboot_setcurrdev(struct env_var *ev, int flags, const void *value) 235{ 236 struct uboot_devdesc *ncurr; 237 int rv; 238 239 if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0) 240 return(rv); 241 free(ncurr); 242 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 243 return(0); 244} 245