#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <asm/page.h>

int main(int argc,char **argv)
{
  char buff[1024];
  char file[256];
  char *mmaped;
  int fd;
  unsigned int st,len,poff;
  int r;
  char *dev="/dev/mem";

  if(argc!=3)
    {
      fprintf(stderr,"memtest <start addr> <len>\n");
      return 1;
    }
  st=strtoul(argv[1],NULL,16);
  len=strtoul(argv[2],NULL,16);
  poff=st%PAGE_SIZE;

  fd=open(dev,O_RDONLY);
  if(fd<0)
    {
      fprintf(stderr,"cannot open %s\n",dev);
      return 1;
    }
  fprintf(stderr,"mmap: start %08X  len:%08X\n",st-poff,len+poff);
  mmaped=mmap(0,len+poff,PROT_READ,MAP_SHARED,fd,st-poff);
  if(mmaped==MAP_FAILED)
    {
      fprintf(stderr,"cannot mmap\n");
      return 1;
    }
  fwrite(mmaped+poff,1,len,stdout); 
  munmap(mmaped,len);
  close(fd);
  return 0;
}