1/*	$NetBSD: devicename.c,v 1.3 2006/11/24 19:38:55 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 <sys/disklabel.h>
36
37#include <bootstrap.h>
38
39#include <efi.h>
40#include <efilib.h>
41#include "efiboot.h"
42
43static int	efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path);
44
45/*
46 * Point (dev) at an allocated device specifier for the device matching the
47 * path in (devspec). If it contains an explicit device specification,
48 * use that.  If not, use the default device.
49 */
50int
51efi_getdev(void **vdev, const char *devspec, const char **path)
52{
53	struct efi_devdesc **dev = (struct efi_devdesc **)vdev;
54	int		rv;
55
56	/*
57	 * If it looks like this is just a path and no
58	 * device, go with the current device.
59	 */
60	if ((devspec == NULL) ||
61	    (devspec[0] == '/') ||
62	    (strchr(devspec, ':') == NULL)) {
63
64		if (((rv = efi_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
65		    (path != NULL))
66			*path = devspec;
67		return(rv);
68	}
69
70	/*
71	 * Try to parse the device name off the beginning of the devspec
72	 */
73	return(efi_parsedev(dev, devspec, path));
74}
75
76/*
77 * Point (dev) at an allocated device specifier matching the string version
78 * at the beginning of (devspec).  Return a pointer to the remaining
79 * text in (path).
80 *
81 * In all cases, the beginning of (devspec) is compared to the names
82 * of known devices in the device switch, and then any following text
83 * is parsed according to the rules applied to the device type.
84 *
85 * For disk-type devices, the syntax is:
86 *
87 * disk<unit>[s<slice>][<partition>]:
88 *
89 */
90static int
91efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path)
92{
93	struct efi_devdesc *idev;
94	struct devsw	*dv;
95	int dv_type;
96	int		i, unit, slice, partition, err;
97	char		*cp;
98	const char	*np;
99
100	/* minimum length check */
101	if (strlen(devspec) < 2)
102		return(EINVAL);
103
104	/* look for a device that matches */
105	for (i = 0, dv = NULL; i < ndevs; i++) {
106		if (!strncmp(devspec, devsw[i].dv_name, strlen(devsw[i].dv_name))) {
107			dv = &devsw[i];
108			break;
109		}
110	}
111
112	if (dv == NULL)
113		return(ENOENT);
114	idev = alloc(sizeof(struct efi_devdesc));
115	err = 0;
116	np = (devspec + strlen(dv->dv_name));
117
118	dv_type = DEVT_NONE;
119	if (!strncmp("disk", dv->dv_name, 4)) dv_type = DEVT_DISK;
120	if (!strncmp("net", dv->dv_name, 3)) dv_type = DEVT_DISK;
121
122	switch(dv_type) {
123	case DEVT_NONE:			/* XXX what to do here?  Do we care? */
124		break;
125
126	case DEVT_DISK:
127		unit = -1;
128		slice = -1;
129		partition = -1;
130		if (*np && (*np != ':')) {
131			unit = strtol(np, &cp, 10);	/* next comes the unit number */
132			if (cp == np) {
133				err = EUNIT;
134				goto fail;
135			}
136			if (*cp == 's') {		/* got a slice number */
137				np = cp + 1;
138				slice = strtol(np, &cp, 10);
139				if (cp == np) {
140					err = EPART;   /* XXX : NetBSD calls a FreeBSD SLICE, a Partition! */
141					goto fail;
142				}
143			}
144			if (*cp && (*cp != ':')) {
145				partition = *cp - 'a';		/* get a partition number */
146				if ((partition < 0) || (partition >= MAXPARTITIONS)) {
147					err = EPART;
148					goto fail;
149				}
150				cp++;
151			}
152		}
153		if (*cp && (*cp != ':')) {
154			err = EINVAL;
155			goto fail;
156		}
157
158		idev->d_kind.efidisk.unit = unit;
159		idev->d_kind.efidisk.slice = slice;
160		idev->d_kind.efidisk.partition = partition;
161
162		if (path != NULL)
163			*path = (*cp == 0) ? cp : cp + 1;
164		break;
165
166	case DEVT_NET:
167		unit = 0;
168
169		if (*np && (*np != ':')) {
170			unit = strtol(np, &cp, 0);	/* get unit number if present */
171			if (cp == np) {
172				err = EUNIT;
173				goto fail;
174			}
175		}
176		if (*cp && (*cp != ':')) {
177			err = EINVAL;
178			goto fail;
179		}
180
181		idev->d_kind.netif.unit = unit;
182		if (path != NULL)
183			*path = (*cp == 0) ? cp : cp + 1;
184		break;
185
186	default:
187		err = EINVAL;
188		goto fail;
189	}
190	idev->d_dev = dv;
191	idev->d_type = dv_type;
192	if (dev == NULL) {
193		free(idev);
194	} else {
195		*dev = idev;
196	}
197	return(0);
198
199 fail:
200	free(idev);
201	return(err);
202}
203
204
205char *
206efi_fmtdev(void *vdev)
207{
208	struct efi_devdesc *dev = (struct efi_devdesc *)vdev;
209	static char	buf[128];	/* XXX device length constant? */
210	char		*cp;
211
212	switch(dev->d_type) {
213	case DEVT_NONE:
214		strcpy(buf, "(no device)");
215		break;
216
217	case DEVT_DISK:
218		cp = buf;
219		cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.efidisk.unit);
220		if (dev->d_kind.efidisk.slice > 0)
221			cp += sprintf(cp, "s%d", dev->d_kind.efidisk.slice);
222		if (dev->d_kind.efidisk.partition >= 0)
223			cp += sprintf(cp, "%c", dev->d_kind.efidisk.partition + 'a');
224		strcat(cp, ":");
225		break;
226
227	case DEVT_NET:
228		sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit);
229		break;
230	}
231	return(buf);
232}
233
234
235/*
236 * Set currdev to suit the value being supplied in (value)
237 */
238int
239efi_setcurrdev(struct env_var *ev, int flags, void *value)
240{
241	struct efi_devdesc *ncurr;
242	int		rv;
243
244	if ((rv = efi_parsedev(&ncurr, value, NULL)) != 0)
245		return(rv);
246	free(ncurr);
247	env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
248	return(0);
249}
250
251