1 /*-
2 * Copyright (c) 1998 Michael Smith <[email protected]>
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 #ifdef EFI_ZFS_BOOT
38 #include <libzfs.h>
39 #endif
40
41 #include <efi.h>
42 #include <efilib.h>
43
44 static int efi_parsedev(struct devdesc **, const char *, const char **);
45
46 /*
47 * Point (dev) at an allocated device specifier for the device matching the
48 * path in (devspec). If it contains an explicit device specification,
49 * use that. If not, use the default device.
50 */
51 int
efi_getdev(void ** vdev,const char * devspec,const char ** path)52 efi_getdev(void **vdev, const char *devspec, const char **path)
53 {
54 struct devdesc **dev = (struct devdesc **)vdev;
55 int rv;
56
57 /*
58 * If it looks like this is just a path and no device, then
59 * use the current device instead.
60 */
61 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) {
62 rv = efi_parsedev(dev, getenv("currdev"), NULL);
63 if (rv == 0 && path != NULL)
64 *path = devspec;
65 return (rv);
66 }
67
68 /* Parse the device name off the beginning of the devspec. */
69 return (efi_parsedev(dev, devspec, path));
70 }
71
72 /*
73 * Point (dev) at an allocated device specifier matching the string version
74 * at the beginning of (devspec). Return a pointer to the remaining
75 * text in (path).
76 *
77 * In all cases, the beginning of (devspec) is compared to the names
78 * of known devices in the device switch, and then any following text
79 * is parsed according to the rules applied to the device type.
80 *
81 * For disk-type devices, the syntax is:
82 *
83 * fs<unit>:
84 */
85 static int
efi_parsedev(struct devdesc ** dev,const char * devspec,const char ** path)86 efi_parsedev(struct devdesc **dev, const char *devspec, const char **path)
87 {
88 struct devdesc *idev;
89 struct devsw *dv;
90 int i, unit, err;
91 char *cp;
92 const char *np;
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; devsw[i] != NULL; i++) {
100 dv = devsw[i];
101 if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name)))
102 break;
103 }
104 if (devsw[i] == NULL)
105 return (ENOENT);
106
107 np = devspec + strlen(dv->dv_name);
108 idev = NULL;
109 err = 0;
110
111 switch (dv->dv_type) {
112 case DEVT_NONE:
113 break;
114
115 case DEVT_DISK:
116 idev = malloc(sizeof(struct disk_devdesc));
117 if (idev == NULL)
118 return (ENOMEM);
119
120 err = disk_parsedev((struct disk_devdesc *)idev, np, path);
121 if (err != 0)
122 goto fail;
123 break;
124
125 #ifdef EFI_ZFS_BOOT
126 case DEVT_ZFS:
127 idev = malloc(sizeof(struct zfs_devdesc));
128 if (idev == NULL)
129 return (ENOMEM);
130
131 err = zfs_parsedev((struct zfs_devdesc*)idev, np, path);
132 if (err != 0)
133 goto fail;
134 break;
135 #endif
136 default:
137 idev = malloc(sizeof(struct devdesc));
138 if (idev == NULL)
139 return (ENOMEM);
140
141 unit = 0;
142 cp = (char *)np;
143
144 if (*np != '\0' && *np != ':') {
145 errno = 0;
146 unit = strtol(np, &cp, 0);
147 if (errno != 0 || cp == np) {
148 err = EUNIT;
149 goto fail;
150 }
151 }
152 if (*cp != '\0' && *cp != ':') {
153 err = EINVAL;
154 goto fail;
155 }
156
157 idev->d_unit = unit;
158 if (path != NULL)
159 *path = (*cp == 0) ? cp : cp + 1;
160 break;
161 }
162
163 idev->d_dev = dv;
164
165 if (dev != NULL)
166 *dev = idev;
167 else
168 free(idev);
169 return (0);
170
171 fail:
172 free(idev);
173 return (err);
174 }
175
176 char *
efi_fmtdev(void * vdev)177 efi_fmtdev(void *vdev)
178 {
179 struct devdesc *dev = (struct devdesc *)vdev;
180 static char buf[SPECNAMELEN + 1];
181
182 switch(dev->d_dev->dv_type) {
183 case DEVT_NONE:
184 strcpy(buf, "(no device)");
185 break;
186
187 case DEVT_DISK:
188 return (disk_fmtdev(vdev));
189
190 #ifdef EFI_ZFS_BOOT
191 case DEVT_ZFS:
192 return (zfs_fmtdev(dev));
193 #endif
194 default:
195 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
196 break;
197 }
198
199 return (buf);
200 }
201
202 /*
203 * Set currdev to suit the value being supplied in (value)
204 */
205 int
efi_setcurrdev(struct env_var * ev,int flags,const void * value)206 efi_setcurrdev(struct env_var *ev, int flags, const void *value)
207 {
208 struct devdesc *ncurr;
209 int rv;
210
211 rv = efi_parsedev(&ncurr, value, NULL);
212 if (rv != 0)
213 return (rv);
214
215 free(ncurr);
216 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
217 return (0);
218 }
219