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
32 struct 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
41 int 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
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