1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1994-1995, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include <sys/param.h>
30#include <sys/modctl.h>
31#include <sys/salib.h>
32
33#include <sys/platnames.h>
34
35/*
36 * Supplied by modpath.c
37 *
38 * Making these externs here allows all sparc machines to share
39 * mod_path_uname_m().
40 */
41extern char *default_name;
42extern char *default_path;
43
44/*
45 * Is path "/platform/"dir"/" ?
46 */
47static int
48platcmp(char *path, char *dir)
49{
50	static char prefix[] = "/platform/";
51	static char suffix[] = "/kernel";
52	int len;
53
54	if (strncmp(path, prefix, sizeof (prefix) - 1) != 0)
55		return (0);
56	len = strlen(dir);
57	path += sizeof (prefix) - 1;
58	if (strncmp(path, dir, len) != 0)
59		return (0);
60	path += len;
61	if (strcmp(path, suffix) != 0)
62		return (0);
63	return (1);
64}
65
66/*
67 * This function provides a hook for enhancing the module_path.
68 */
69/*ARGSUSED*/
70void
71mod_path_uname_m(char *mod_path, char *ia_name)
72{
73
74	if (ia_name == NULL)
75		return;
76
77	/*
78	 * If we found the kernel in the default dir, prepend the ia_name
79	 * directory (e.g. /platform/SUNW,foo/kernel) to the mod_path unless
80	 * ia_name is the same as the default dir.  This can happen if we
81	 * found the kernel via the "compatible" property.
82	 *
83	 * If we found the kernel in the ia_name dir, append the default
84	 * directory to the modpath.
85	 *
86	 * If neither of the above are true, we were given a specific kernel
87	 * to boot, so we leave things well enough alone.
88	 */
89	if (platcmp(mod_path, default_name)) {
90		if (strcmp(ia_name, default_name) != 0) {
91			char tmp[MOD_MAXPATH];
92
93			(void) strcpy(tmp, mod_path);
94			(void) strcpy(mod_path, "/platform/");
95			(void) strcat(mod_path, ia_name);
96			(void) strcat(mod_path, "/kernel ");
97			(void) strcat(mod_path, tmp);
98		}
99	} else if (platcmp(mod_path, ia_name))
100		(void) strcat(mod_path, default_path);
101}
102