Patchwork [U-Boot,v7,1/4] lib: add rand() function

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Submitter Michael Walle
Date May 31, 2012, 6:12 p.m.
Message ID <1338487965-31791-2-git-send-email-michael@walle.cc>
Download mbox | patch
Permalink /patch/162213/
State Superseded
Headers show

Comments

Michael Walle - May 31, 2012, 6:12 p.m.
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>
---
 include/common.h |    8 ++++++++
 lib/Makefile     |    1 +
 lib/rand.c       |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+), 0 deletions(-)
 create mode 100644 lib/rand.c

Patch

diff --git a/include/common.h b/include/common.h
index 8564a65..16ed96d 100644
--- a/include/common.h
+++ b/include/common.h
@@ -751,6 +751,14 @@  char *	strmhz(char *buf, unsigned long hz);
 /* lib/crc32.c */
 #include <u-boot/crc.h>
 
+/* lib/rand.c */
+#ifdef CONFIG_RAND
+#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..5828be0 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_RAND) += 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;
+}