mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 00:21:06 +00:00
99e139d590
Replace rand() with the functions from lib/. The link-local network code stores its own seed, derived from the MAC address. Thus making it independent from calls to srand() in other modules. Signed-off-by: Michael Walle <michael@walle.cc> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
43 lines
762 B
C
43 lines
762 B
C
/*
|
|
* 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__ */
|