projects / J-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> |
| ea707dc0 MB |
13 | #include <dm/uclass.h> |
| 14 | #include <rng.h> | |
| eafc8db0 JH |
15 | |
| 16 | /* | |
| 99e139d5 | 17 | * Return a seed for the PRNG derived from the eth0 MAC address. |
| eafc8db0 | 18 | */ |
| 99e139d5 MW |
19 | static inline unsigned int seed_mac(void) |
| 20 | { | |
| b044cc1d | 21 | unsigned char enetaddr[ARP_HLEN]; |
| 99e139d5 MW |
22 | unsigned int seed; |
| 23 | ||
| 24 | /* get our mac */ | |
| b044cc1d | 25 | memcpy(enetaddr, eth_get_ethaddr(), ARP_HLEN); |
| 99e139d5 MW |
26 | |
| 27 | seed = enetaddr[5]; | |
| 28 | seed ^= enetaddr[4] << 8; | |
| 29 | seed ^= enetaddr[3] << 16; | |
| 30 | seed ^= enetaddr[2] << 24; | |
| 31 | seed ^= enetaddr[1]; | |
| 32 | seed ^= enetaddr[0] << 8; | |
| 33 | ||
| 34 | return seed; | |
| 35 | } | |
| eafc8db0 JH |
36 | |
| 37 | /* | |
| 99e139d5 | 38 | * Seed the random number generator using the eth0 MAC address. |
| eafc8db0 | 39 | */ |
| 99e139d5 MW |
40 | static inline void srand_mac(void) |
| 41 | { | |
| ea707dc0 MB |
42 | int ret; |
| 43 | struct udevice *devp; | |
| 44 | u32 randv = 0; | |
| 45 | ||
| 46 | if (IS_ENABLED(CONFIG_DM_RNG)) { | |
| 47 | ret = uclass_get_device(UCLASS_RNG, 0, &devp); | |
| 48 | if (ret) { | |
| 49 | ret = dm_rng_read(devp, &randv, sizeof(randv)); | |
| 50 | if (ret < 0) | |
| 51 | randv = 0; | |
| 52 | } | |
| 53 | } | |
| 54 | if (randv) | |
| 55 | srand(randv); | |
| 56 | else | |
| 57 | srand(seed_mac()); | |
| 99e139d5 | 58 | } |
| eafc8db0 JH |
59 | |
| 60 | #endif /* __NET_RAND_H__ */ |