devicename.c revision 1.7 
1/*	$NetBSD: devicename.c,v 1.7 2014/03/27 18:22:56 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30
31/* __FBSDID("$FreeBSD: src/sys/boot/efi/libefi/devicename.c,v 1.3 2004/01/04 23:28:16 obrien Exp $"); */
32
33#include <lib/libsa/stand.h>
34#include <lib/libsa/loadfile.h>
35#include <lib/libkern/libkern.h>
36#include <sys/disklabel.h>
37
38#include <bootstrap.h>
39
40#include <efi.h>
41#include <efilib.h>
42#include "efiboot.h"
43
44static int	efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path);
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 */
51int
52efi_getdev(void **vdev, const char *devspec, const char **path)
53{
54	struct efi_devdesc **dev = (struct efi_devdesc **)vdev;
55	int		rv;
56
57	/*
58	 * If it looks like this is just a path and no
59	 * device, go with the current device.
60	 */
61	if ((devspec == NULL) ||
62	    (devspec[0] == '/') ||
63	    (strchr(devspec, ':') == NULL)) {
64
65		if (((rv = efi_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
66		    (path != NULL))
67			*path = devspec;
68		return(rv);
69	}
70
71	/*
72	 * Try to parse the device name off the beginning of the devspec
73	 */
74	return(efi_parsedev(dev, devspec, path));
75}
76
77/*
78 * Point (dev) at an allocated device specifier matching the string version
79 * at the beginning of (devspec).  Return a pointer to the remaining
80 * text in (path).
81 *
82 * In all cases, the beginning of (devspec) is compared to the names
83 * of known devices in the device switch, and then any following text
84 * is parsed according to the rules applied to the device type.
85 *
86 * For disk-type devices, the syntax is:
87 *
88 * disk<unit>[s<slice>][<partition>]:
89 *
90 */
91static int
92efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path)
93{
94	struct efi_devdesc *idev;
95	struct devsw	*dv;
96	int dv_type;
97	int		i, unit, slice, partition, err;
98	char		*cp;
99	const char	*np;
100
101	/* minimum length check */
102	if (strlen(devspec) < 2)
103		return(EINVAL);
104
105	/* look for a device that matches */
106	for (i = 0, dv = NULL; i < ndevs; i++) {
107		if (!strncmp(devspec, devsw[i].dv_name, strlen(devsw[i].dv_name))) {
108			dv = &devsw[i];
109			break;
110		}
111	}
112
113	if (dv == NULL)
114		return(ENOENT);
115	idev = alloc(sizeof(struct efi_devdesc));
116	err = 0;
117	np = (devspec + strlen(dv->dv_name));
118
119	dv_type = DEVT_NONE;
120	if (!strncmp("disk", dv->dv_name, 4)) dv_type = DEVT_DISK;
121	if (!strncmp("net", dv->dv_name, 3)) dv_type = DEVT_DISK;
122
123	switch(dv_type) {
124	case DEVT_NONE:			/* XXX what to do here?  Do we care? */
125		break;
126
127	case DEVT_DISK:
128		unit = -1;
129		slice = -1;
130		partition = -1;
131		if (*np && (*np != ':')) {
132			unit = strtol(np, &cp, 10);	/* next comes the unit number */
133			if (cp == np) {
134				err = EUNIT;
135				goto fail;
136			}
137			if (*cp == 's') {		/* got a slice number */
138				np = cp + 1;
139				slice = strtol(np, &cp, 10);
140				if (cp == np) {
141					err = EPART;   /* XXX : NetBSD calls a FreeBSD SLICE, a Partition! */
142					goto fail;
143				}
144			}
145			if (*cp && (*cp != ':')) {
146				partition = *cp - 'a';		/* get a partition number */
147				if ((partition < 0) || (partition >= MAXPARTITIONS)) {
148					err = EPART;
149					goto fail;
150				}
151				cp++;
152			}
153		}
154		if (*cp && (*cp != ':')) {
155			err = EINVAL;
156			goto fail;
157		}
158
159		idev->d_kind.efidisk.unit = unit;
160		idev->d_kind.efidisk.slice = slice;
161		idev->d_kind.efidisk.partition = partition;
162
163		if (path != NULL)
164			*path = (*cp == 0) ? cp : cp + 1;
165		break;
166
167	case DEVT_NET:
168		unit = 0;
169
170		if (*np && (*np != ':')) {
171			unit = strtol(np, &cp, 0);	/* get unit number if present */
172			if (cp == np) {
173				err = EUNIT;
174				goto fail;
175			}
176		}
177		if (*cp && (*cp != ':')) {
178			err = EINVAL;
179			goto fail;
180		}
181
182		idev->d_kind.netif.unit = unit;
183		if (path != NULL)
184			*path = (*cp == 0) ? cp : cp + 1;
185		break;
186
187	default:
188		err = EINVAL;
189		goto fail;
190	}
191	idev->d_dev = dv;
192	idev->d_type = dv_type;
193	if (dev == NULL) {
194		free(idev);
195	} else {
196		*dev = idev;
197	}
198	return(0);
199
200 fail:
201	free(idev);
202	return(err);
203}
204
205
206char *
207efi_fmtdev(void *vdev)
208{
209	struct efi_devdesc *dev = (struct efi_devdesc *)vdev;
210	static char	buf[128];	/* XXX device length constant? */
211	size_t		len, buflen = sizeof(buf);
212
213	switch(dev->d_type) {
214	case DEVT_NONE:
215		strlcpy(buf, "(no device)", sizeof(buf));
216		break;
217
218	case DEVT_DISK:
219		len = snprintf(buf, buflen, "%s%d", dev->d_dev->dv_name, dev->d_kind.efidisk.unit);
220		if (len > buflen)
221			len = buflen;
222		if (dev->d_kind.efidisk.slice > 0) {
223			len += snprintf(buf + len, buflen - len, "s%d", dev->d_kind.efidisk.slice);
224			if (len > buflen)
225				len = buflen;
226		}
227		if (dev->d_kind.efidisk.partition >= 0) {
228			len += snprintf(buf + len, buflen - len, "%c", dev->d_kind.efidisk.partition + 'a');
229			if (len > buflen)
230		}
231				len = buflen;
232		strlcat(buf, ":", sizeof(buf) - len);
233		break;
234
235	case DEVT_NET:
236		snprintf(buf, buflen, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit);
237		break;
238	}
239	return(buf);
240}
241
242
243/*
244 * Set currdev to suit the value being supplied in (value)
245 */
246int
247efi_setcurrdev(struct env_var *ev, int flags, void *value)
248{
249	struct efi_devdesc *ncurr;
250	int		rv;
251
252	if ((rv = efi_parsedev(&ncurr, value, NULL)) != 0)
253		return(rv);
254	free(ncurr);
255	env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
256	return(0);
257}
258
259