From eafc8db0e35275330f43a4cf7b7ae8aba71c9728 Mon Sep 17 00:00:00 2001 From: Joe Hershberger Date: Wed, 23 May 2012 07:57:58 +0000 Subject: net: Move MAC-seeded rand out of bootp.c Make the MAC-seeded random number generator available to /net in general. MAC-seeded rand will be needed by link-local as well, so give it an interface. Signed-off-by: Joe Hershberger Acked-by: Simon Glass --- net/net_rand.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 net/net_rand.c (limited to 'net/net_rand.c') diff --git a/net/net_rand.c b/net/net_rand.c new file mode 100644 index 0000000..5387aba --- /dev/null +++ b/net/net_rand.c @@ -0,0 +1,68 @@ +/* + * Based on LiMon - BOOTP. + * + * Copyright 1994, 1995, 2000 Neil Russell. + * (See License) + * Copyright 2000 Roland Borde + * Copyright 2000 Paolo Scaffardi + * Copyright 2000-2004 Wolfgang Denk, wd@denx.de + */ + +#include +#include +#include "net_rand.h" + +static ulong seed1, seed2; + +void srand_mac(void) +{ + ulong tst1, tst2, m_mask; + ulong m_value = 0; + int reg; + unsigned char bi_enetaddr[6]; + + /* get our mac */ + eth_getenv_enetaddr("ethaddr", bi_enetaddr); + + debug("BootpRequest => Our Mac: "); + for (reg = 0; reg < 6; reg++) + debug("%x%c", bi_enetaddr[reg], reg == 5 ? '\n' : ':'); + + /* Mac-Manipulation 2 get seed1 */ + tst1 = 0; + tst2 = 0; + for (reg = 2; reg < 6; reg++) { + tst1 = tst1 << 8; + tst1 = tst1 | bi_enetaddr[reg]; + } + for (reg = 0; reg < 2; reg++) { + tst2 = tst2 | bi_enetaddr[reg]; + tst2 = tst2 << 8; + } + + seed1 = tst1^tst2; + + /* Mirror seed1*/ + m_mask = 0x1; + for (reg = 1; reg <= 32; reg++) { + m_value |= (m_mask & seed1); + seed1 = seed1 >> 1; + m_value = m_value << 1; + } + seed1 = m_value; + seed2 = 0xb78d0945; +} + +unsigned long rand(void) +{ + ulong sum; + + /* Random Number Generator */ + sum = seed1 + seed2; + if (sum < seed1 || sum < seed2) + sum++; + seed2 = seed1; + seed1 = sum; + + return sum; +} -- cgit v1.1