/*      $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);
}