1/*
2 *  linux/arch/m68k/tools/amiga/dmesg.c -- Retrieve the kernel messages stored
3 *					   in Chip RAM with the kernel command
4 *					   line option `debug=mem'.
5 *
6 *  �� Copyright 1996 by Geert Uytterhoeven <geert@linux-m68k.org>
7 *
8 *
9 *  Usage:
10 *
11 *	dmesg
12 *	dmesg <CHIPMEM_END>
13 *
14 *
15 *  This file is subject to the terms and conditions of the GNU General Public
16 *  License.  See the file COPYING in the main directory of the Linux
17 *  distribution for more details.
18 */
19
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <unistd.h>
24
25
26#define CHIPMEM_START	0x00000000
27#define CHIPMEM_END	0x00200000	/* overridden by argv[1] */
28
29#define SAVEKMSG_MAGIC1	0x53415645	/* 'SAVE' */
30#define SAVEKMSG_MAGIC2	0x4B4D5347	/* 'KMSG' */
31
32struct savekmsg {
33    u_long magic1;	/* SAVEKMSG_MAGIC1 */
34    u_long magic2;	/* SAVEKMSG_MAGIC2 */
35    u_long magicptr;	/* address of magic1 */
36    u_long size;
37    char data[];
38};
39
40
41int main(int argc, char *argv[])
42{
43    u_long start = CHIPMEM_START, end = CHIPMEM_END, p;
44    int found = 0;
45    struct savekmsg *m = NULL;
46
47    if (argc >= 2)
48	end = strtoul(argv[1], NULL, 0);
49    printf("Searching for SAVEKMSG magic...\n");
50    for (p = start; p <= end-sizeof(struct savekmsg); p += 4) {
51	m = (struct savekmsg *)p;
52	if ((m->magic1 == SAVEKMSG_MAGIC1) && (m->magic2 == SAVEKMSG_MAGIC2) &&
53	    (m->magicptr == p)) {
54	    found = 1;
55	    break;
56	}
57    }
58    if (!found)
59	printf("Not found\n");
60    else {
61	printf("Found %ld bytes at 0x%08lx\n", m->size, (u_long)&m->data);
62	puts(">>>>>>>>>>>>>>>>>>>>");
63	fflush(stdout);
64	write(1, &m->data, m->size);
65	fflush(stdout);
66	puts("<<<<<<<<<<<<<<<<<<<<");
67    }
68    return(0);
69}
70