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("$FreeBSD$"); 29 30 #include <stand.h> 31 #include <string.h> 32 33 #include "bootstrap.h" 34 #include "disk.h" 35 #include "libuboot.h" 36 37 static int uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 38 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 */ 45 int 46 uboot_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 */ 84 static int 85 uboot_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, 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 #ifdef LOADER_DISK_SUPPORT 117 case DEVT_DISK: 118 free(idev); 119 err = disk_parsedev((struct devdesc **)&idev, devspec, path); 120 if (err != 0) 121 goto fail; 122 break; 123 #endif 124 125 case DEVT_NET: 126 unit = 0; 127 128 if (*np && (*np != ':')) { 129 /* get unit number if present */ 130 unit = strtol(np, &cp, 0); 131 if (cp == np) { 132 err = EUNIT; 133 goto fail; 134 } 135 } 136 if (*cp && (*cp != ':')) { 137 err = EINVAL; 138 goto fail; 139 } 140 idev->dd.d_unit = unit; 141 142 if (path != NULL) 143 *path = (*cp == 0) ? cp : cp + 1; 144 break; 145 146 default: 147 err = EINVAL; 148 goto fail; 149 } 150 idev->dd.d_dev = dv; 151 /* 152 * dev can be NULL, since uboot_getdev calls us directly, rather than via 153 * dv_parsedev in devparse() which otherwise ensures that it can't be NULL. 154 */ 155 if (dev == NULL) { 156 free(idev); 157 } else { 158 *dev = idev; 159 } 160 return (0); 161 162 fail: 163 free(idev); 164 return (err); 165 } 166 167 168 /* 169 * Set currdev to suit the value being supplied in (value). 170 */ 171 int 172 uboot_setcurrdev(struct env_var *ev, int flags, const void *value) 173 { 174 struct uboot_devdesc *ncurr; 175 int rv; 176 177 if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0) 178 return (rv); 179 free(ncurr); 180 181 return (mount_currdev(ev, flags, value)); 182 } 183