/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <sys/param.h>
#include <sys/idprom.h>
#include <sys/promif.h>
#include <sys/salib.h>

#include <sys/platnames.h>

/*
 * This source is (and should be ;-) shared between the boot blocks
 * and the boot programs.  So if you change it, be sure to test them all!
 */

#define MAXNMLEN        1024            /* # of chars in a property */

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

enum ia_state_mach {
        STATE_NAME,
        STATE_COMPAT_INIT,
        STATE_COMPAT,
        STATE_DEFAULT,
        STATE_FINI
};

/*
 * Return the implementation architecture name (uname -i) for this platform.
 *
 * Use the named rootnode property to determine the iarch.
 */
static char *
get_impl_arch_name(enum ia_state_mach *state, int use_default)
{
        static char iarch[MAXNMLEN];
        static int len;
        static char *ia;

        pnode_t n;
        char *cp;
        char *namename;

newstate:
        switch (*state) {
        case STATE_NAME:
                *state = STATE_COMPAT_INIT;
                namename = OBP_NAME;
                n = (pnode_t)prom_rootnode();
                len = prom_getproplen(n, namename);
                if (len <= 0 || len >= MAXNMLEN)
                        goto newstate;
                (void) prom_getprop(n, namename, iarch);
                iarch[len] = '\0';      /* fix broken clones */
                ia = iarch;
                break;

        case STATE_COMPAT_INIT:
                *state = STATE_COMPAT;
                namename = OBP_COMPATIBLE;
                n = (pnode_t)prom_rootnode();
                len = prom_getproplen(n, namename);
                if (len <= 0 || len >= MAXNMLEN) {
                        *state = STATE_DEFAULT;
                        goto newstate;
                }
                (void) prom_getprop(n, namename, iarch);
                iarch[len] = '\0';      /* ensure null termination */
                ia = iarch;
                break;

        case STATE_COMPAT:
                /*
                 * Advance 'ia' to point to next string in
                 * compatible property array (if any).
                 */
                while (*ia++)
                        ;
                if ((ia - iarch) >= len) {
                        *state = STATE_DEFAULT;
                        goto newstate;
                }
                break;

        case STATE_DEFAULT:
                *state = STATE_FINI;
                if (!use_default || default_name == NULL)
                        goto newstate;
                (void) strcpy(iarch, default_name);
                ia = iarch;
                break;

        case STATE_FINI:
                return (NULL);
        }

        /*
         * Crush filesystem-awkward characters.  See PSARC/1992/170.
         * (Convert the property to a sane directory name in UFS)
         */
        for (cp = ia; *cp; cp++)
                if (*cp == '/' || *cp == ' ' || *cp == '\t')
                        *cp = '_';
        return (ia);
}

static void
make_platform_path(char *fullpath, char *iarch, char *filename)
{
        (void) strcpy(fullpath, "/platform/");
        (void) strcat(fullpath, iarch);
        if (filename != NULL) {
                (void) strcat(fullpath, "/");
                (void) strcat(fullpath, filename);
        }
}

/*
 * Generate impl_arch_name by searching the /platform hierarchy
 * for a matching directory.  We are not looking for any particular
 * file here, but for a directory hierarchy for the module path.
 */
int
find_platform_dir(int (*isdirfn)(char *), char *iarch, int use_default)
{
        char fullpath[MAXPATHLEN];
        char *ia;
        enum ia_state_mach state = STATE_NAME;

        /*
         * Hunt the filesystem looking for a directory hierarchy.
         */
        while ((ia = get_impl_arch_name(&state, use_default)) != NULL) {
                make_platform_path(fullpath, ia, NULL);
                if (((*isdirfn)(fullpath)) != 0) {
                        (void) strcpy(iarch, ia);
                        return (1);
                }
        }
        return (0);
}

/*
 * Search the /platform hierarchy looking for a particular file.
 *
 * impl_arch_name is given as an optional hint as to where the
 * file might be found.
 */
int
open_platform_file(
        char *filename,
        int (*openfn)(char *, void *),
        void *arg,
        char *fullpath)
{
        char *ia;
        int fd;
        enum ia_state_mach state = STATE_NAME;

        /*
         * Hunt the filesystem for one that works ..
         */
        while ((ia = get_impl_arch_name(&state, 1)) != NULL) {
                make_platform_path(fullpath, ia, filename);
                if ((fd = (*openfn)(fullpath, arg)) != -1)
                        return (fd);
        }

        return (-1);
}