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