1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 2006 Marcel Moolenaar 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <stand.h> 32 #include <string.h> 33 #include <sys/disklabel.h> 34 #include <sys/param.h> 35 #include <bootstrap.h> 36 #include <disk.h> 37 38 #include <efi.h> 39 #include <efilib.h> 40 #include <efizfs.h> 41 42 static int efi_parsedev(struct devdesc **, const char *, const char **); 43 44 /* 45 * Point (dev) at an allocated device specifier for the device matching the 46 * path in (devspec). If it contains an explicit device specification, 47 * use that. If not, use the default device. 48 */ 49 int 50 efi_getdev(void **vdev, const char *devspec, const char **path) 51 { 52 struct devdesc **dev = (struct devdesc **)vdev; 53 int rv; 54 55 /* 56 * If it looks like this is just a path and no device, then 57 * use the current device instead. 58 */ 59 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) { 60 rv = efi_parsedev(dev, getenv("currdev"), NULL); 61 if (rv == 0 && path != NULL) 62 *path = devspec; 63 return (rv); 64 } 65 66 /* Parse the device name off the beginning of the devspec. */ 67 return (efi_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 * fs<unit>: 82 */ 83 static int 84 efi_parsedev(struct devdesc **dev, const char *devspec, const char **path) 85 { 86 struct devdesc *idev; 87 struct devsw *dv; 88 int i, unit, 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; devsw[i] != NULL; i++) { 98 dv = devsw[i]; 99 if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name))) 100 break; 101 } 102 if (devsw[i] == NULL) 103 return (ENOENT); 104 105 np = devspec + strlen(dv->dv_name); 106 idev = NULL; 107 err = 0; 108 109 switch (dv->dv_type) { 110 case DEVT_NONE: 111 break; 112 113 case DEVT_DISK: 114 err = disk_parsedev(&idev, np, path); 115 if (err != 0) 116 goto fail; 117 break; 118 119 #ifdef EFI_ZFS_BOOT 120 case DEVT_ZFS: 121 idev = malloc(sizeof(struct zfs_devdesc)); 122 if (idev == NULL) 123 return (ENOMEM); 124 125 err = zfs_parsedev((struct zfs_devdesc*)idev, np, path); 126 if (err != 0) 127 goto fail; 128 break; 129 #endif 130 default: 131 idev = malloc(sizeof(struct devdesc)); 132 if (idev == NULL) 133 return (ENOMEM); 134 135 unit = 0; 136 cp = (char *)np; 137 138 if (*np != '\0' && *np != ':') { 139 errno = 0; 140 unit = strtol(np, &cp, 0); 141 if (errno != 0 || cp == np) { 142 err = EUNIT; 143 goto fail; 144 } 145 } 146 if (*cp != '\0' && *cp != ':') { 147 err = EINVAL; 148 goto fail; 149 } 150 151 idev->d_unit = unit; 152 if (path != NULL) 153 *path = (*cp == 0) ? cp : cp + 1; 154 break; 155 } 156 157 idev->d_dev = dv; 158 159 if (dev != NULL) 160 *dev = idev; 161 else 162 free(idev); 163 return (0); 164 165 fail: 166 free(idev); 167 return (err); 168 } 169 170 /* 171 * Set currdev to suit the value being supplied in (value) 172 */ 173 int 174 efi_setcurrdev(struct env_var *ev, int flags, const void *value) 175 { 176 struct devdesc *ncurr; 177 int rv; 178 179 rv = efi_parsedev(&ncurr, value, NULL); 180 if (rv != 0) 181 return (rv); 182 free(ncurr); 183 184 return (mount_currdev(ev, flags, value)); 185 } 186