/*
 * readrom: simple code to read 256k of rom from phatbox
 * usage: readrom <output-file>
 * based on code for devmem2, copyright statement appears below:
 *
 * devmem2.c: Simple program to read/write from/to any location in memory.
 *
 *  Copyright (C) 2000, Jan-Derk Bakker (jdb@lartmaker.nl)
 *
 *
 * This software has been developed for the LART computing board
 * (http://www.lart.tudelft.nl/). The development has been sponsored by
 * the Mobile MultiMedia Communications (http://www.mmc.tudelft.nl/)
 * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/)
 * projects.
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/mman.h>
  
#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
  __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
 
#define MAP_SIZE 4096UL
#define MAP_MASK (MAP_SIZE - 1)

int main(int argc, char **argv) {
    int fd;
    void *map_base, *virt_addr; 
    FILE  *outfile;
	unsigned long read_result, writeval;
	off_t target;
	int pagenum;
	int access_type = 'w';	
printf("readrom started\n");
	fflush(stdout);

	if(argc < 1) {
		fprintf(stderr, "\nUsage:\t%s outfile\n"
			"\toutfile    : output file to create\n\n",
			argv[0]);
		exit(1);
	}

	printf("opening /dev/mem\n");
	fflush(stdout);
	
    if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
    printf("/dev/mem opened, fd = %d.\n",fd); 
    fflush(stdout);
    if(!(outfile=fopen(argv[1],"w"))) FATAL;
    printf("Output file %s opened.\n",argv[1]);
    fflush(stdout);
    map_base = mmap(0, 256*1024, PROT_READ, MAP_SHARED, fd, 0);
    if(map_base == (void *) -1) FATAL;
    printf("Memory mapped at address %p.\n", map_base); 
    fflush(stdout);
    
    fwrite(map_base,1,256*1024,outfile);
    /*    if(munmap(map_base, 256*1024) == -1) FATAL;*/

    printf("okay, wrote stuff.\n");
    fflush(stdout);
    close(fd);
    fclose(outfile);
    return 0;
}