/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1994-1995, by Sun Microsystems, Inc.
 * All rights reserved.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/param.h>
#include <sys/modctl.h>
#include <sys/salib.h>

#include <sys/platnames.h>

/*
 * Supplied by modpath.c
 *
 * Making these externs here allows all sparc machines to share
 * mod_path_uname_m().
 */
extern char *default_name;
extern char *default_path;

/*
 * Is path "/platform/"dir"/" ?
 */
static int
platcmp(char *path, char *dir)
{
	static char prefix[] = "/platform/";
	static char suffix[] = "/kernel";
	int len;

	if (strncmp(path, prefix, sizeof (prefix) - 1) != 0)
		return (0);
	len = strlen(dir);
	path += sizeof (prefix) - 1;
	if (strncmp(path, dir, len) != 0)
		return (0);
	path += len;
	if (strcmp(path, suffix) != 0)
		return (0);
	return (1);
}

/*
 * This function provides a hook for enhancing the module_path.
 */
/*ARGSUSED*/
void
mod_path_uname_m(char *mod_path, char *ia_name)
{

	if (ia_name == NULL)
		return;

	/*
	 * If we found the kernel in the default dir, prepend the ia_name
	 * directory (e.g. /platform/SUNW,foo/kernel) to the mod_path unless
	 * ia_name is the same as the default dir.  This can happen if we
	 * found the kernel via the "compatible" property.
	 *
	 * If we found the kernel in the ia_name dir, append the default
	 * directory to the modpath.
	 *
	 * If neither of the above are true, we were given a specific kernel
	 * to boot, so we leave things well enough alone.
	 */
	if (platcmp(mod_path, default_name)) {
		if (strcmp(ia_name, default_name) != 0) {
			char tmp[MOD_MAXPATH];

			(void) strcpy(tmp, mod_path);
			(void) strcpy(mod_path, "/platform/");
			(void) strcat(mod_path, ia_name);
			(void) strcat(mod_path, "/kernel ");
			(void) strcat(mod_path, tmp);
		}
	} else if (platcmp(mod_path, ia_name))
		(void) strcat(mod_path, default_path);
}