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 <stand.h> 28 #include <string.h> 29 30 #include "bootstrap.h" 31 #include "disk.h" 32 #include "libuboot.h" 33 34 static int uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 35 const char **path); 36 37 /* 38 * Point (dev) at an allocated device specifier for the device matching the 39 * path in (devspec). If it contains an explicit device specification, 40 * use that. If not, use the default device. 41 */ 42 int 43 uboot_getdev(void **vdev, const char *devspec, const char **path) 44 { 45 struct uboot_devdesc **dev = (struct uboot_devdesc **)vdev; 46 int rv; 47 48 /* 49 * If it looks like this is just a path and no 50 * device, go with the current device. 51 */ 52 if ((devspec == NULL) || (devspec[0] == '/') || 53 (strchr(devspec, ':') == NULL)) { 54 55 if (((rv = uboot_parsedev(dev, getenv("currdev"), NULL)) == 0) 56 && (path != NULL)) 57 *path = devspec; 58 return(rv); 59 } 60 61 /* 62 * Try to parse the device name off the beginning of the devspec. 63 */ 64 return (uboot_parsedev(dev, devspec, path)); 65 } 66 67 /* 68 * Point (dev) at an allocated device specifier matching the string version 69 * at the beginning of (devspec). Return a pointer to the remaining 70 * text in (path). 71 * 72 * In all cases, the beginning of (devspec) is compared to the names 73 * of known devices in the device switch, and then any following text 74 * is parsed according to the rules applied to the device type. 75 * 76 * For disk-type devices, the syntax is: 77 * 78 * disk<unit>[<partition>]: 79 * 80 */ 81 static int 82 uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 83 const char **path) 84 { 85 struct uboot_devdesc *idev; 86 struct devsw *dv; 87 char *cp; 88 const char *np; 89 int i, unit, err; 90 91 /* minimum length check */ 92 if (strlen(devspec) < 2) 93 return(EINVAL); 94 95 /* look for a device that matches */ 96 for (i = 0, dv = NULL; devsw[i] != NULL; i++) { 97 if (!strncmp(devspec, devsw[i]->dv_name, 98 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 uboot_devdesc)); 106 err = 0; 107 np = (devspec + strlen(dv->dv_name)); 108 109 switch(dv->dv_type) { 110 case DEVT_NONE: 111 break; 112 113 #ifdef LOADER_DISK_SUPPORT 114 case DEVT_DISK: 115 free(idev); 116 err = disk_parsedev((struct devdesc **)&idev, devspec, path); 117 if (err != 0) 118 goto fail; 119 break; 120 #endif 121 122 case DEVT_NET: 123 unit = 0; 124 125 if (*np && (*np != ':')) { 126 /* get unit number if present */ 127 unit = strtol(np, &cp, 0); 128 if (cp == np) { 129 err = EUNIT; 130 goto fail; 131 } 132 } 133 if (*cp && (*cp != ':')) { 134 err = EINVAL; 135 goto fail; 136 } 137 idev->dd.d_unit = unit; 138 139 if (path != NULL) 140 *path = (*cp == 0) ? cp : cp + 1; 141 break; 142 143 default: 144 err = EINVAL; 145 goto fail; 146 } 147 idev->dd.d_dev = dv; 148 /* 149 * dev can be NULL, since uboot_getdev calls us directly, rather than via 150 * dv_parsedev in devparse() which otherwise ensures that it can't be NULL. 151 */ 152 if (dev == NULL) { 153 free(idev); 154 } else { 155 *dev = idev; 156 } 157 return (0); 158 159 fail: 160 free(idev); 161 return (err); 162 } 163 164 165 /* 166 * Set currdev to suit the value being supplied in (value). 167 */ 168 int 169 uboot_setcurrdev(struct env_var *ev, int flags, const void *value) 170 { 171 struct uboot_devdesc *ncurr; 172 int rv; 173 174 if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0) 175 return (rv); 176 free(ncurr); 177 178 return (mount_currdev(ev, flags, value)); 179 } 180