projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| eafc8db0 JH |
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 | ||
| 99e139d5 | 12 | #include <common.h> |
| eafc8db0 JH |
13 | |
| 14 | /* | |
| 99e139d5 | 15 | * Return a seed for the PRNG derived from the eth0 MAC address. |
| eafc8db0 | 16 | */ |
| 99e139d5 MW |
17 | static inline unsigned int seed_mac(void) |
| 18 | { | |
| b044cc1d | 19 | unsigned char enetaddr[ARP_HLEN]; |
| 99e139d5 MW |
20 | unsigned int seed; |
| 21 | ||
| 22 | /* get our mac */ | |
| b044cc1d | 23 | memcpy(enetaddr, eth_get_ethaddr(), ARP_HLEN); |
| 99e139d5 MW |
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 | } | |
| eafc8db0 JH |
34 | |
| 35 | /* | |
| 99e139d5 | 36 | * Seed the random number generator using the eth0 MAC address. |
| eafc8db0 | 37 | */ |
| 99e139d5 MW |
38 | static inline void srand_mac(void) |
| 39 | { | |
| 40 | srand(seed_mac()); | |
| 41 | } | |
| eafc8db0 JH |
42 | |
| 43 | #endif /* __NET_RAND_H__ */ |