/*
   *	Copied from LiMon - BOOTP.
   *
   *	Copyright 1994, 1995, 2000 Neil Russell.
   *	(See License)
   *	Copyright 2000 Paolo Scaffardi
   */
  
  #ifndef __NET_RAND_H__
  #define __NET_RAND_H__

  #include <common.h>

  
  /*

   * Return a seed for the PRNG derived from the eth0 MAC address.

   */

  static inline unsigned int seed_mac(void)
  {

  	unsigned char enetaddr[ARP_HLEN];

  	unsigned int seed;
  
  	/* get our mac */

  	memcpy(enetaddr, eth_get_ethaddr(), ARP_HLEN);

  
  	seed = enetaddr[5];
  	seed ^= enetaddr[4] << 8;
  	seed ^= enetaddr[3] << 16;
  	seed ^= enetaddr[2] << 24;
  	seed ^= enetaddr[1];
  	seed ^= enetaddr[0] << 8;
  
  	return seed;
  }

  
  /*

   * Seed the random number generator using the eth0 MAC address.

   */

  static inline void srand_mac(void)
  {
  	srand(seed_mac());
  }

  
  #endif /* __NET_RAND_H__ */