Am Samstag 12 Mai 2012, 00:50:45 schrieb Michael Walle: > It's a PRNG using the simple and fast xorshift method. > > Signed-off-by: Michael Walle <mich...@walle.cc> > Cc: Wolfgang Denk <w...@denx.de>
Hi Wolfgang, can you ack this patch? In that case i could add the acked-by line in the next version of this patch series to ease the picking by Prafulla. All your previous comments should be addressed :) > --- > include/common.h | 6 ++++++ > lib/Makefile | 1 + > lib/rand.c | 43 +++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 50 insertions(+), 0 deletions(-) > create mode 100644 lib/rand.c > > diff --git a/include/common.h b/include/common.h > index 4b5841e..a9cb62c 100644 > --- a/include/common.h > +++ b/include/common.h > @@ -733,6 +733,12 @@ char * strmhz(char *buf, unsigned long hz); > /* lib/crc32.c */ > #include <u-boot/crc.h> > > +/* lib/rand.c */ > +#ifdef CONFIG_RANDOM_MACADDR > +void srand(unsigned int seed); > +unsigned int rand(void); > +#endif > + > /* common/console.c */ > int console_init_f(void); /* Before relocation; uses the serial stuff */ > int console_init_r(void); /* After relocation; uses the console stuff */ > diff --git a/lib/Makefile b/lib/Makefile > index a0fec60..74579f9 100644 > --- a/lib/Makefile > +++ b/lib/Makefile > @@ -65,6 +65,7 @@ COBJS-y += string.o > COBJS-y += time.o > COBJS-$(CONFIG_BOOTP_PXE) += uuid.o > COBJS-y += vsprintf.o > +COBJS-$(CONFIG_RANDOM_MACADDR) += rand.o > > COBJS := $(COBJS-y) > SRCS := $(COBJS:.o=.c) > diff --git a/lib/rand.c b/lib/rand.c > new file mode 100644 > index 0000000..6cb76ac > --- /dev/null > +++ b/lib/rand.c > @@ -0,0 +1,43 @@ > +/* > + * Simple xorshift PRNG > + * see http://www.jstatsoft.org/v08/i14/paper > + * > + * Copyright (c) 2012 Michael Walle > + * Michael Walle <mich...@walle.cc> > + * > + * See file CREDITS for list of people who contributed to this > + * project. > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation; either version 2 of > + * the License, or (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, > + * MA 02111-1307 USA > + */ > + > +#include <common.h> > + > +static unsigned int y = 1U; > + > +void srand(unsigned int seed) > +{ > + y = seed; > +} > + > +unsigned int rand(void) > +{ > + y ^= (y << 13); > + y ^= (y >> 17); > + y ^= (y << 5); > + > + return y; > +} -- Michael _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
