[coreboot] libpayload: Add rand() et al.

[Jordan Crouse]

On 08/04/08 00:41 +0200, Uwe Hermann wrote:
> See patch.
> 
> Note that these are pseudo-random numbers, do _not_ try to use them
> for crypto stuff!
> 
> 
> Uwe.
> -- 
> http://www.hermann-uwe.de  | http://www.holsham-traders.de
> http://www.crazy-hacks.org | http://www.unmaintained-free-software.org

> Add rand/rand_r/srand functions for generating pseudo-random bytes.
> 
> Signed-off-by: Uwe Hermann <uwe at hermann-uwe.de>

Acked-by: Jordan Crouse <jordan.crouse at amd.com>

> Index: include/libpayload.h
> ===================================================================
> --- include/libpayload.h	(Revision 3220)
> +++ include/libpayload.h	(Arbeitskopie)
> @@ -53,6 +53,8 @@
>  #define BYTE_ORDER	BIG_ENDIAN
>  #endif
>  
> +#define RAND_MAX 0x7fffffff
> +
>  /* Some NVRAM byte definitions */
>  #define NVRAM_RTC_SECONDS        0
>  #define NVRAM_RTC_MINUTES        2
> Index: LICENSES
> ===================================================================
> --- LICENSES	(Revision 3220)
> +++ LICENSES	(Arbeitskopie)
> @@ -66,6 +66,12 @@
>    Original files: lib/libalias/alias_util.c, function LibAliasInternetChecksum()
>    Current version we use: CVS revision 1.15 2004/07/06 12:13:28
>  
> +* libc/rand.c: 3-clause BSD license
> +  Source: OpenBSD
> +          http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdlib/rand.c
> +  Original files: src/lib/libc/stdlib/rand.c
> +  Current version we use: CVS revision 1.9 2005/8/8 08:05:37
> +
>  * libc/memory.c: 3-clause BSD license
>    Source: HelenOS, http://www.helenos.eu
>            svn checkout svn://svn.helenos.eu/HelenOS/trunk HelenOS
> Index: libc/Makefile.inc
> ===================================================================
> --- libc/Makefile.inc	(Revision 3220)
> +++ libc/Makefile.inc	(Arbeitskopie)
> @@ -29,3 +29,4 @@
>  
>  TARGETS-y += libc/malloc.o libc/printf.o libc/console.o libc/string.o
>  TARGETS-y += libc/memory.o libc/ctype.o libc/ipchecksum.o libc/lib.o
> +TARGETS-y += libc/rand.o
> Index: libc/rand.c
> ===================================================================
> --- libc/rand.c	(Revision 0)
> +++ libc/rand.c	(Revision 0)
> @@ -0,0 +1,52 @@
> +/*
> + * This file is part of the libpayload project.
> + *
> + * It was originally taken from the OpenBSD project.
> + *
> + * Copyright (c) 1990 The Regents of the University of California.
> + * All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of the University nor the names of its contributors
> + *    may be used to endorse or promote products derived from this software
> + *    without specific prior written permission.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + */
> +
> +#include <libpayload.h>
> +
> +static unsigned int next = 1;
> +
> +int rand_r(unsigned int *seed)
> +{
> +	*seed = *seed * 1103515245 + 12345;
> +	return (*seed % ((unsigned int)RAND_MAX + 1));
> +}
> +
> +int rand(void)
> +{
> +	return (rand_r(&next));
> +}
> +
> +void srand(unsigned int seed)
> +{
> +	next = seed;
> +}

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-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.