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Linux/arch/m68k/tools/amiga/dmesg.c

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  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[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 }
 70 

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