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
42static 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 */
49int
50efi_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 */
83static int
84efi_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		idev = malloc(sizeof(struct disk_devdesc));
115		if (idev == NULL)
116			return (ENOMEM);
117
118		err = disk_parsedev((struct disk_devdesc *)idev, np, path);
119		if (err != 0)
120			goto fail;
121		break;
122
123#ifdef EFI_ZFS_BOOT
124	case DEVT_ZFS:
125		idev = malloc(sizeof(struct zfs_devdesc));
126		if (idev == NULL)
127			return (ENOMEM);
128
129		err = zfs_parsedev((struct zfs_devdesc*)idev, np, path);
130		if (err != 0)
131			goto fail;
132		break;
133#endif
134	default:
135		idev = malloc(sizeof(struct devdesc));
136		if (idev == NULL)
137			return (ENOMEM);
138
139		unit = 0;
140		cp = (char *)np;
141
142		if (*np != '\0' && *np != ':') {
143			errno = 0;
144			unit = strtol(np, &cp, 0);
145			if (errno != 0 || cp == np) {
146				err = EUNIT;
147				goto fail;
148			}
149		}
150		if (*cp != '\0' && *cp != ':') {
151			err = EINVAL;
152			goto fail;
153		}
154
155		idev->d_unit = unit;
156		if (path != NULL)
157			*path = (*cp == 0) ? cp : cp + 1;
158		break;
159	}
160
161	idev->d_dev = dv;
162
163	if (dev != NULL)
164		*dev = idev;
165	else
166		free(idev);
167	return (0);
168
169fail:
170	free(idev);
171	return (err);
172}
173
174char *
175efi_fmtdev(void *vdev)
176{
177	struct devdesc *dev = (struct devdesc *)vdev;
178	static char buf[SPECNAMELEN + 1];
179
180	switch(dev->d_dev->dv_type) {
181	case DEVT_NONE:
182		strcpy(buf, "(no device)");
183		break;
184
185	case DEVT_DISK:
186		return (disk_fmtdev(vdev));
187
188#ifdef EFI_ZFS_BOOT
189	case DEVT_ZFS:
190		return (zfs_fmtdev(dev));
191#endif
192	default:
193		sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
194		break;
195	}
196
197	return (buf);
198}
199
200/*
201 * Set currdev to suit the value being supplied in (value)
202 */
203int
204efi_setcurrdev(struct env_var *ev, int flags, const void *value)
205{
206	struct devdesc *ncurr;
207	int rv;
208
209	rv = efi_parsedev(&ncurr, value, NULL);
210	if (rv != 0)
211		return (rv);
212
213	free(ncurr);
214	env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
215	return (0);
216}
217