LXR uboot/net/net

   1/*
   2 *      Copied from LiMon - BOOTP.
   3 *
   4 *      Copyright 1994, 1995, 2000 Neil Russell.
   5 *      (See License)
   6 *      Copyright 2000 Paolo Scaffardi
   7 */
   8
   9#ifndef __NET_RAND_H__
  10#define __NET_RAND_H__
  11
  12#include <common.h>
  13
  14/*
  15 * Return a seed for the PRNG derived from the eth0 MAC address.
  16 */
  17static inline unsigned int seed_mac(void)
  18{
  19        unsigned char enetaddr[6];
  20        unsigned int seed;
  21
  22        /* get our mac */
  23        eth_getenv_enetaddr("ethaddr", enetaddr);
  24
  25        seed = enetaddr[5];
  26        seed ^= enetaddr[4] << 8;
  27        seed ^= enetaddr[3] << 16;
  28        seed ^= enetaddr[2] << 24;
  29        seed ^= enetaddr[1];
  30        seed ^= enetaddr[0] << 8;
  31
  32        return seed;
  33}
  34
  35/*
  36 * Seed the random number generator using the eth0 MAC address.
  37 */
  38static inline void srand_mac(void)
  39{
  40        srand(seed_mac());
  41}
  42
  43#endif /* __NET_RAND_H__ */
  44