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 #include <stand.h> 29 #include <string.h> 30 31 #include "bootstrap.h" 32 #include "disk.h" 33 #include "libuboot.h" 34 35 static int uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 36 const char **path); 37 38 /* 39 * Point (dev) at an allocated device specifier for the device matching the 40 * path in (devspec). If it contains an explicit device specification, 41 * use that. If not, use the default device. 42 */ 43 int 44 uboot_getdev(void **vdev, const char *devspec, const char **path) 45 { 46 struct uboot_devdesc **dev = (struct uboot_devdesc **)vdev; 47 int rv; 48 49 /* 50 * If it looks like this is just a path and no 51 * device, go with the current device. 52 */ 53 if ((devspec == NULL) || (devspec[0] == '/') || 54 (strchr(devspec, ':') == NULL)) { 55 56 if (((rv = uboot_parsedev(dev, getenv("currdev"), NULL)) == 0) 57 && (path != NULL)) 58 *path = devspec; 59 return(rv); 60 } 61 62 /* 63 * Try to parse the device name off the beginning of the devspec. 64 */ 65 return (uboot_parsedev(dev, devspec, path)); 66 } 67 68 /* 69 * Point (dev) at an allocated device specifier matching the string version 70 * at the beginning of (devspec). Return a pointer to the remaining 71 * text in (path). 72 * 73 * In all cases, the beginning of (devspec) is compared to the names 74 * of known devices in the device switch, and then any following text 75 * is parsed according to the rules applied to the device type. 76 * 77 * For disk-type devices, the syntax is: 78 * 79 * disk<unit>[<partition>]: 80 * 81 */ 82 static int 83 uboot_parsedev(struct uboot_devdesc **dev, const char *devspec, 84 const char **path) 85 { 86 struct uboot_devdesc *idev; 87 struct devsw *dv; 88 char *cp; 89 const char *np; 90 int i, unit, err; 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, dv = NULL; devsw[i] != NULL; i++) { 98 if (!strncmp(devspec, devsw[i]->dv_name, 99 strlen(devsw[i]->dv_name))) { 100 dv = devsw[i]; 101 break; 102 } 103 } 104 if (dv == NULL) 105 return(ENOENT); 106 idev = malloc(sizeof(struct uboot_devdesc)); 107 err = 0; 108 np = (devspec + strlen(dv->dv_name)); 109 110 switch(dv->dv_type) { 111 case DEVT_NONE: 112 break; 113 114 #ifdef LOADER_DISK_SUPPORT 115 case DEVT_DISK: 116 free(idev); 117 err = disk_parsedev((struct devdesc **)&idev, devspec, path); 118 if (err != 0) 119 goto fail; 120 break; 121 #endif 122 123 case DEVT_NET: 124 unit = 0; 125 126 if (*np && (*np != ':')) { 127 /* get unit number if present */ 128 unit = strtol(np, &cp, 0); 129 if (cp == np) { 130 err = EUNIT; 131 goto fail; 132 } 133 } 134 if (*cp && (*cp != ':')) { 135 err = EINVAL; 136 goto fail; 137 } 138 idev->dd.d_unit = unit; 139 140 if (path != NULL) 141 *path = (*cp == 0) ? cp : cp + 1; 142 break; 143 144 default: 145 err = EINVAL; 146 goto fail; 147 } 148 idev->dd.d_dev = dv; 149 /* 150 * dev can be NULL, since uboot_getdev calls us directly, rather than via 151 * dv_parsedev in devparse() which otherwise ensures that it can't be NULL. 152 */ 153 if (dev == NULL) { 154 free(idev); 155 } else { 156 *dev = idev; 157 } 158 return (0); 159 160 fail: 161 free(idev); 162 return (err); 163 } 164 165 166 /* 167 * Set currdev to suit the value being supplied in (value). 168 */ 169 int 170 uboot_setcurrdev(struct env_var *ev, int flags, const void *value) 171 { 172 struct uboot_devdesc *ncurr; 173 int rv; 174 175 if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0) 176 return (rv); 177 free(ncurr); 178 179 return (mount_currdev(ev, flags, value)); 180 } 181