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bootxx.c revision 1.7 
      1 /*	$NetBSD: bootxx.c,v 1.7 2002/05/04 22:05:29 scw Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Paul Kranenburg.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 /*
     40  * This is a generic "first-stage" boot program.
     41  *
     42  * Note that this program has absolutely no filesystem knowledge!
     43  *
     44  * Instead, this uses a table of disk block numbers that are
     45  * filled in by the installboot program such that this program
     46  * can load the "second-stage" boot program.
     47  */
     48 
     49 #include <sys/param.h>
     50 #include <sys/time.h>
     51 #include <sys/exec.h>
     52 #include <sys/exec_elf.h>
     53 #include <machine/prom.h>
     54 
     55 #include "stand.h"
     56 #include "libsa.h"
     57 #include "bootxx.h"
     58 
     59 int copyboot __P((struct open_file *, u_long *));
     60 void main __P((void));
     61 
     62 /*
     63  * Boot device is derived from ROM provided information.
     64  */
     65 #define LOADADDR	0x11000 /* where to load level 2 bootstrap */
     66 				/* (l2 must relocate itself) */
     67 
     68 extern int     	block_size;
     69 extern int     	block_count;	/* length of table */
     70 extern daddr_t 	block_table[];
     71 
     72 extern		char bootprog_name[], bootprog_rev[];
     73 
     74 int main(void);
     75 
     76 int
     77 main()
     78 {
     79 	struct open_file	f;
     80 	u_long	addr;
     81 	char *foo;
     82 	int error;
     83 
     84 	printf("Boot: bug device: ctrl=%d, dev=%d\n",
     85 		bugargs.ctrl_lun, bugargs.dev_lun);
     86 	printf("\nbootxx: %s first level bootstrap program [%s]\n\n",
     87 		bootprog_name, bootprog_rev);
     88 
     89 	f.f_flags = F_RAW;
     90 	if (devopen(&f, 0, &foo)) {
     91 		printf("bootxx: open failed\n");
     92 		_rtt();
     93 	}
     94 
     95 	addr = LOADADDR;
     96 	error = copyboot(&f, &addr);
     97 	f.f_dev->dv_close(&f);
     98 	if (!error)
     99 		bugexec((void *)addr);
    100 
    101 	/* copyboot had a problem... */
    102 	_rtt();
    103 }
    104 
    105 int
    106 copyboot(fp, addr)
    107 	struct open_file	*fp;
    108 	u_long			*addr;
    109 {
    110 	int	n, i, blknum;
    111 	char	*laddr = (char *) *addr;
    112 	union boothead {
    113 		struct exec ah;
    114 		Elf32_Ehdr eh;
    115 	} *x;
    116 
    117 	x = (union boothead *)laddr;
    118 
    119 	if (!block_count) {
    120 		printf("bootxx: no data!?!\n");
    121 		return -1;
    122 	}
    123 
    124 	for (i = 0; i < block_count; i++) {
    125 
    126 		if ((blknum = block_table[i]) == 0)
    127 			break;
    128 
    129 #ifdef DEBUG
    130 		printf("bootxx: read block # %d = %d\n", i, blknum);
    131 #endif
    132 		if ((fp->f_dev->dv_strategy)(fp->f_devdata, F_READ,
    133 					   blknum, block_size, laddr, &n))
    134 		{
    135 			printf("bootxx: read failed\n");
    136 			return -1;
    137 		}
    138 		if (n != block_size) {
    139 			printf("bootxx: short read\n");
    140 			return -1;
    141 		}
    142 		laddr += block_size;
    143 	}
    144 
    145 	if (N_GETMAGIC(x->ah) == OMAGIC)
    146 		*addr += sizeof(x->ah);
    147 	else
    148 	if (memcmp(x->eh.e_ident, ELFMAG, SELFMAG) == 0) {
    149 		Elf32_Phdr *ep = (Elf32_Phdr *)(*addr + x->eh.e_phoff);
    150 		*addr += ep->p_offset;
    151 	} else {
    152 		printf("bootxx: secondary bootstrap isn't an executable\n");
    153 		return(-1);
    154 	}
    155 
    156 	return (0);
    157 }
    158