#ifndef __NET_RAND_H__
#define __NET_RAND_H__
-#define RAND_MAX 0xffffffff
+#include <common.h>
/*
- * Seed the random number generator using the eth0 MAC address
+ * Return a seed for the PRNG derived from the eth0 MAC address.
*/
-void srand_mac(void);
+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;
+}
/*
- * Get a random number (after seeding with MAC address)
- *
- * @return random number
+ * Seed the random number generator using the eth0 MAC address.
*/
-unsigned long rand(void);
+static inline void srand_mac(void)
+{
+ srand(seed_mac());
+}
#endif /* __NET_RAND_H__ */