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/*

 *  linux/arch/m68k/tools/amiga/dmesg.c -- Retrieve the kernel messages stored

 *                                         in Chip RAM with the kernel command

 *                                         line option `debug=mem'.

 *

 *  © Copyright 1996 by Geert Uytterhoeven

 *                     (Geert.Uytterhoeven@cs.kuleuven.ac.be)

 *

 *

 *  Compilation (under AmigaOS):

 *

 *      gcc -o dmesg dmesg.c -noixemul -idirafter INCLUDE: -Wall -s -O3

 *

 *  Usage:

 *

 *      dmesg

 *      dmesg <CHIPMEM_END>

 *

 *

 *  This file is subject to the terms and conditions of the GNU General Public

 *  License.  See the file COPYING in the main directory of the Linux

 *  distribution for more details.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#define CHIPMEM_START   0x00000000

#define CHIPMEM_END     0x00200000      /* overridden by argv[1] */

#define SAVEKMSG_MAGIC1 0x53415645      /* 'SAVE' */

#define SAVEKMSG_MAGIC2 0x4B4D5347      /* 'KMSG' */

struct savekmsg {

    u_long magic1;      /* SAVEKMSG_MAGIC1 */

    u_long magic2;      /* SAVEKMSG_MAGIC2 */

    u_long magicptr;    /* address of magic1 */

    u_long size;

    char data[0];

};

int main(int argc, char *argv[])

{

    u_long start = CHIPMEM_START, end = CHIPMEM_END, p;

    int found = 0;

    struct savekmsg *m = NULL;

    if (argc >= 2)

        end = strtoul(argv[1], NULL, 0);

    printf("Searching for SAVEKMSG magic...\n");

    for (p = start; p <= end-sizeof(struct savekmsg); p += 4) {

        m = (struct savekmsg *)p;

        if ((m->magic1 == SAVEKMSG_MAGIC1) && (m->magic2 == SAVEKMSG_MAGIC2) &&

            (m->magicptr == p)) {

            found = 1;

            break;

        }

    }

    if (!found)

        printf("Not found\n");

    else {

        printf("Found %ld bytes at 0x%08lx\n", m->size, (u_long)&m->data);

        puts(">>>>>>>>>>>>>>>>>>>>");

        fflush(stdout);

        write(1, &m->data, m->size);

        fflush(stdout);

        puts("<<<<<<<<<<<<<<<<<<<<");

    }

    return(0);

}