boot.c revision 1.1 
1/*	$NetBSD: boot.c,v 1.1 1998/06/09 07:53:06 dbj Exp $	*/
2/*
3 * Copyright (c) 1994 Rolf Grossmann
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *      This product includes software developed by Rolf Grossmann.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/param.h>
33#include <sys/reboot.h>
34
35#include <lib/libsa/stand.h>
36
37#include <machine/cpu.h>        /* for NEXT_RAMBASE */
38
39#define LOADADDR        (char *)NEXT_RAMBASE
40
41extern int errno;
42
43/*
44 * Boot device is derived from PROM provided information.
45 */
46
47char *version="$Revision: 1.1 $";
48extern int subversion;
49#define KNAMEN 100
50char kernel[KNAMEN];
51char *entry_point;		/* return value filled in by machdep_start */
52
53extern void rtc_init(void);
54
55extern int try_bootp;
56
57char *
58main(char *boot_arg)
59{
60    printf(">> NetBSD BOOT [%s #%d]\n", version, subversion);
61    rtc_init();
62
63    try_bootp = 1;
64
65#if 0
66    printf("Press return to continue.\n");
67    getchar();
68#endif
69
70    strcpy(kernel, boot_arg);
71    entry_point = NULL;
72
73    while (1) {
74	errno = 0;
75	exec(kernel, LOADADDR, 0);
76	if (errno == ENOEXEC && entry_point != NULL) {
77          printf("Kernel loaded at 0x%lx\n",(unsigned long)entry_point);
78#if 0
79          printf("Press return to continue.\n");
80          getchar();
81#endif
82          return entry_point;
83        }
84
85	printf("load of %s: %s\n", kernel, strerror(errno));
86	printf("boot: ");
87	gets(kernel);
88	/* XXX we have to write this back into boot_arg or even mg->boot* */
89	if (kernel[0] == '\0')
90		return NULL;
91    }
92}
93