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1da177e4 LT |
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 | * | |
96de0e25 | 6 | * © Copyright 1996 by Geert Uytterhoeven <geert@linux-m68k.org> |
1da177e4 LT |
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[0]; | |
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 | } |