1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * linux/arch/m68k/tools/amiga/dmesg.c -- Retrieve the kernel messages stored
3*4882a593Smuzhiyun * in Chip RAM with the kernel command
4*4882a593Smuzhiyun * line option `debug=mem'.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * © Copyright 1996 by Geert Uytterhoeven <geert@linux-m68k.org>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * Usage:
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * dmesg
12*4882a593Smuzhiyun * dmesg <CHIPMEM_END>
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun *
15*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
16*4882a593Smuzhiyun * License. See the file COPYING in the main directory of the Linux
17*4882a593Smuzhiyun * distribution for more details.
18*4882a593Smuzhiyun */
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #include <stdio.h>
22*4882a593Smuzhiyun #include <stdlib.h>
23*4882a593Smuzhiyun #include <unistd.h>
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define CHIPMEM_START 0x00000000
27*4882a593Smuzhiyun #define CHIPMEM_END 0x00200000 /* overridden by argv[1] */
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun #define SAVEKMSG_MAGIC1 0x53415645 /* 'SAVE' */
30*4882a593Smuzhiyun #define SAVEKMSG_MAGIC2 0x4B4D5347 /* 'KMSG' */
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun struct savekmsg {
33*4882a593Smuzhiyun u_long magic1; /* SAVEKMSG_MAGIC1 */
34*4882a593Smuzhiyun u_long magic2; /* SAVEKMSG_MAGIC2 */
35*4882a593Smuzhiyun u_long magicptr; /* address of magic1 */
36*4882a593Smuzhiyun u_long size;
37*4882a593Smuzhiyun char data[];
38*4882a593Smuzhiyun };
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun
main(int argc,char * argv[])41*4882a593Smuzhiyun int main(int argc, char *argv[])
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun u_long start = CHIPMEM_START, end = CHIPMEM_END, p;
44*4882a593Smuzhiyun int found = 0;
45*4882a593Smuzhiyun struct savekmsg *m = NULL;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun if (argc >= 2)
48*4882a593Smuzhiyun end = strtoul(argv[1], NULL, 0);
49*4882a593Smuzhiyun printf("Searching for SAVEKMSG magic...\n");
50*4882a593Smuzhiyun for (p = start; p <= end-sizeof(struct savekmsg); p += 4) {
51*4882a593Smuzhiyun m = (struct savekmsg *)p;
52*4882a593Smuzhiyun if ((m->magic1 == SAVEKMSG_MAGIC1) && (m->magic2 == SAVEKMSG_MAGIC2) &&
53*4882a593Smuzhiyun (m->magicptr == p)) {
54*4882a593Smuzhiyun found = 1;
55*4882a593Smuzhiyun break;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun if (!found)
59*4882a593Smuzhiyun printf("Not found\n");
60*4882a593Smuzhiyun else {
61*4882a593Smuzhiyun printf("Found %ld bytes at 0x%08lx\n", m->size, (u_long)&m->data);
62*4882a593Smuzhiyun puts(">>>>>>>>>>>>>>>>>>>>");
63*4882a593Smuzhiyun fflush(stdout);
64*4882a593Smuzhiyun write(1, &m->data, m->size);
65*4882a593Smuzhiyun fflush(stdout);
66*4882a593Smuzhiyun puts("<<<<<<<<<<<<<<<<<<<<");
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun return(0);
69*4882a593Smuzhiyun }
70