/* * 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[6]; unsigned int seed; /* get our mac */ eth_getenv_enetaddr("ethaddr", enetaddr); 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__ */