/*      $NetBSD: bootxx.c,v 1.9 2009/03/14 21:04:12 dsl Exp $   */

/*-
 * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jonathan Stone, Michael Hitch, Simon Burge and Wayne Knowles.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)boot.c      8.1 (Berkeley) 6/10/93
 */

#include <sys/param.h>
#include <sys/exec_elf.h>
#include <lib/libsa/stand.h>
#include <machine/prom.h>

typedef void (*entrypt)(int, char **, int, const void *);

int main(int, char **);
entrypt loadfile(char *path, char *name);

/*
 * This gets arguments from the PROM, calls other routines to open
 * and load the secondary boot loader called boot, and then transfers
 * execution to that program.
 */
int
main(int argc, char **argv)
{
        entrypt entry;
        char *cp;
        extern void prom_init(void);

        prom_init();

        cp = *argv;

        printf("\nNetBSD/mipsco " NETBSD_VERS " " BOOTXX_FS_NAME " Primary Bootstrap\n");

        entry = loadfile(cp, "/boot");
        if ((int)entry != -1)
                goto goodload;

        entry = loadfile(cp, "/boot.mipsco");
        if ((int)entry != -1)
                goto goodload;

        goto bad;

 goodload:
        MIPS_PROM(flushcache)();
        entry(argc, argv, 0, 0);

 bad:
        return (1);
}

/*
 * Open 'filename', read in program and return the entry point or -1 if error.
 */
entrypt
loadfile(char *path, char *name)
{
        int fd, i;
        char *src, *dst, bootfname[64];
        Elf32_Ehdr ehdr;
        Elf32_Phdr phdr;

        dst = bootfname;
        for (src = path; *src;/**/)
                if ((*dst++ = *src++) == ')')
                        break;
        for (src = name; *src;/**/)
                *dst++ = *src++;
        *dst = (char) 0;

        if ((fd = open(bootfname, 0)) < 0) {
                printf("open %s: %d\n", bootfname, errno);
                goto err;
        }

        /* read the exec header */
        i = read(fd, (char *)&ehdr, sizeof(ehdr));
        if ((i != sizeof(ehdr)) ||
            (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0) ||
            (ehdr.e_ident[EI_CLASS] != ELFCLASS32)) {
                printf("%s: No ELF header\n", bootfname);
                goto cerr;
        }

        for (i = 0; i < ehdr.e_phnum; i++) {
                if (lseek(fd, (off_t) ehdr.e_phoff + i * sizeof(phdr), 0) < 0)
                        goto cerr;
                if (read(fd, &phdr, sizeof(phdr)) != sizeof(phdr))
                        goto cerr;
                if (phdr.p_type != PT_LOAD)
                        continue;
                if (lseek(fd, (off_t)phdr.p_offset, 0) < 0)
                        goto cerr;
                if (read(fd, (char *)phdr.p_paddr, phdr.p_filesz) != phdr.p_filesz)
                        goto cerr;
        }
        return ((entrypt)ehdr.e_entry);

 cerr:
#ifndef LIBSA_NO_FS_CLOSE
        (void) close(fd);
#endif
 err:
        printf("Can't load '%s'\n", bootfname);
        return ((entrypt)-1);
}