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>

diff --git a/include/common.h b/include/common.h
index 7cf15c53b7454278333e695be86ba79d55038419..e16c53e538e1b4ed239e1e68ab86cc070943d2de 100644 (file)
--- 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 1e8478f0312e1a4f9d81513a2ad9ec06272a70cf..0ca45fc1e958c4941f574f7c2c2c2d42695107f1 100644 (file)
--- 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 (file)
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;
+}