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author | Michael Walle <michael@walle.cc> | 2012-06-05 11:33:14 +0000 |
---|---|---|
committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-07-07 14:07:32 +0200 |
commit | 9acf1ca50d8b031511d146f6ffd73201fedce28c (patch) | |
tree | a10e3bb54c3a410ea568ce0d69ff9ef42a601145 | |
parent | d131ad68c6566749df10154d2a6fa93df5865495 (diff) | |
download | u-boot-9acf1ca50d8b031511d146f6ffd73201fedce28c.zip u-boot-9acf1ca50d8b031511d146f6ffd73201fedce28c.tar.gz u-boot-9acf1ca50d8b031511d146f6ffd73201fedce28c.tar.bz2 |
lib: add rand() function
It's a PRNG using the simple and fast xorshift method.
Signed-off-by: Michael Walle <michael@walle.cc>
Cc: Wolfgang Denk <wd@denx.de>
-rw-r--r-- | include/common.h | 8 | ||||
-rw-r--r-- | lib/Makefile | 1 | ||||
-rw-r--r-- | lib/rand.c | 48 |
3 files changed, 57 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h index 7cf15c5..e16c53e 100644 --- a/include/common.h +++ b/include/common.h @@ -760,6 +760,14 @@ char * strmhz(char *buf, unsigned long hz); /* lib/crc32.c */ #include <u-boot/crc.h> +/* lib/rand.c */ +#ifdef CONFIG_RANDOM_MACADDR +#define RAND_MAX -1U +void srand(unsigned int seed); +unsigned int rand(void); +unsigned int rand_r(unsigned int *seedp); +#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 1e8478f..0ca45fc 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -66,6 +66,7 @@ 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..c9764f5 --- /dev/null +++ b/lib/rand.c @@ -0,0 +1,48 @@ +/* + * Simple xorshift PRNG + * see http://www.jstatsoft.org/v08/i14/paper + * + * Copyright (c) 2012 Michael Walle + * Michael Walle <michael@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; + +unsigned int rand_r(unsigned int *seedp) +{ + *seedp ^= (*seedp << 13); + *seedp ^= (*seedp >> 17); + *seedp ^= (*seedp << 5); + + return *seedp; +} + +unsigned int rand(void) +{ + return rand_r(&y); +} + +void srand(unsigned int seed) +{ + y = seed; +} |