devicename.c revision 107483 
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 * $FreeBSD: head/sys/boot/ofw/libofw/devicename.c 107483 2002-12-02 01:46:22Z jake $
27 */
28
29#include <stand.h>
30#include <sys/disklabel.h>
31#include "libofw.h"
32
33static int ofw_parsedev(struct ofw_devdesc **, const char *, const char **);
34
35/*
36 * Point (dev) at an allocated device specifier for the device matching the
37 * path in (devspec). If it contains an explicit device specification,
38 * use that.  If not, use the default device.
39 */
40int
41ofw_getdev(void **vdev, const char *devspec, const char **path)
42{
43    struct ofw_devdesc **dev = (struct ofw_devdesc **)vdev;
44    int				rv;
45
46    /*
47     * If it looks like this is just a path and no
48     * device, go with the current device.
49     */
50    if ((devspec == NULL) ||
51	(strchr(devspec, '@') == NULL)) {
52
53	if (((rv = ofw_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
54	    (path != NULL))
55		*path = devspec;
56	return(rv);
57    }
58
59    /*
60     * Try to parse the device name off the beginning of the devspec
61     */
62    return(ofw_parsedev(dev, devspec, path));
63}
64
65/*
66 * Point (dev) at an allocated device specifier matching the string version
67 * at the beginning of (devspec).  Return a pointer to the remaining
68 * text in (path).
69 */
70static int
71ofw_parsedev(struct ofw_devdesc **dev, const char *devspec, const char **path)
72{
73    struct ofw_devdesc	*idev;
74    struct devsw	*dv;
75    phandle_t		handle;
76    const char		*p;
77    const char		*s;
78    char		name[256];
79    char		type[64];
80    int			len;
81    int			i;
82
83    for (p = s = devspec; *s != '\0'; p = s) {
84	if ((s = strchr(p + 1, '/')) == NULL)
85	    s = strchr(p, '\0');
86	len = s - devspec;
87	bcopy(devspec, name, len);
88	name[len] = '\0';
89	if ((handle = OF_finddevice(name)) == -1)
90	    break;
91	if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
92	    continue;
93	for (i = 0; (dv = devsw[i]) != NULL; i++) {
94	    if (strncmp(dv->dv_name, type, strlen(dv->dv_name)) == 0)
95		goto found;
96	}
97    }
98    return(ENOENT);
99
100found:
101    if (*s != '\0')
102	*path = s;
103    idev = malloc(sizeof(struct ofw_devdesc));
104    strcpy(idev->d_path, name);
105    idev->d_dev = dv;
106    idev->d_type = dv->dv_type;
107    if (dev == NULL) {
108	free(idev);
109    } else {
110	*dev = idev;
111    }
112    return(0);
113}
114
115int
116ofw_setcurrdev(struct env_var *ev, int flags, void *value)
117{
118    struct ofw_devdesc	*ncurr;
119    int			rv;
120
121    if ((rv = ofw_parsedev(&ncurr, value, NULL)) != 0)
122	return rv;
123
124    free(ncurr);
125    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
126    return 0;
127}
128