From owner-freebsd-hackers  Sun Jan 27 16:28: 1 2002
Delivered-To: freebsd-hackers@freebsd.org
Received: from acl.lanl.gov (acl.lanl.gov [128.165.147.1])
	by hub.freebsd.org (Postfix) with SMTP id F04EB37B41B
	for <freebsd-hackers@FreeBSD.ORG>; Sun, 27 Jan 2002 16:27:50 -0800 (PST)
Received: (qmail 665567 invoked from network); 27 Jan 2002 17:27:47 -0700
Received: from snaresland.acl.lanl.gov (128.165.147.113)
  by acl.lanl.gov with SMTP; 27 Jan 2002 17:27:47 -0700
Received: (qmail 13369 invoked by uid 3499); 27 Jan 2002 17:27:47 -0700
Received: from localhost (sendmail-bs@127.0.0.1)
  by localhost with SMTP; 27 Jan 2002 17:27:47 -0700
Date: Sun, 27 Jan 2002 17:27:47 -0700 (MST)
From: Ronald G Minnich <rminnich@lanl.gov>
X-X-Sender:  <rminnich@snaresland.acl.lanl.gov>
To: Matthew Emmerton <matt@gsicomp.on.ca>
Cc: <freebsd-hackers@FreeBSD.ORG>
Subject: Re: Reading BIOS from userland
In-Reply-To: <004a01c1a704$974dca50$1200a8c0@gsicomp.on.ca>
Message-ID: <Pine.LNX.4.33.0201271726080.13349-100000@snaresland.acl.lanl.gov>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

A stupid little program you can use to dump the bios and hunt for version
strings etc.

default is to mmap the last 1MB of the 32-bit space and write it to fildes
1. optional arg 1 is the base (it gets << 16 thanks to a strtol bug that
may no longer be there); optional arg 2 is the size.

Tested on just about everything linux, I don't see any obvious gotchas for
freebsd.

ron

#include <stdio.h>
#include <fcntl.h>

#include <unistd.h>
#include <sys/mman.h>

main(int argc, char *argv[])
{
  int i;
  volatile unsigned char *cp;
  int fd;
  volatile void *v;
  off_t nvram = 0xfff00000;
  /* avoid linux mmap bug */
  size_t length = 0x100000 /*- 0x1000*/;
  if (argc > 1)
    nvram = (strtol(argv[1], 0, 0)) << 16;
  if (argc > 2)
    length = (strtol(argv[2], 0, 0)) ;
    if((fd = open("/dev/mem",O_RDWR)) != -1)
    {
      v = mmap(0, length, PROT_READ | PROT_WRITE, MAP_SHARED,fd,nvram);
      fprintf(stderr, "mmap returns %p\n", v);

      if ( (int)v == -1)
      {
        perror("mmap");
        exit(1);
      }
    } else {
      perror("open /dev/mem");
      exit(1);
    }
  write(1, v, length);
}







To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message