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/*
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* Entropy sampling
*
*/
#include <stdio.h>
#include <ipxe/entropy.h>
#include <ipxe/test.h>
/** Total number of test samples */
#define SAMPLE_COUNT 65536
/** Number of samples per block */
#define SAMPLE_BLOCKSIZE 256
/**
* Generate entropy samples for external testing
*
* @v source Entropy source
*/
static void entropy_sample ( struct entropy_source *source ) {
static noise_sample_t samples[SAMPLE_BLOCKSIZE];
unsigned int i;
unsigned int j;
int rc;
/* Collect and print blocks of samples */
for ( i = 0 ; i < ( SAMPLE_COUNT / SAMPLE_BLOCKSIZE ) ; i++ ) {
/* Collect one block of samples */
rc = entropy_enable ( source );
ok ( rc == 0 );
for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
rc = get_noise ( source, &samples[j] );
ok ( rc == 0 );
}
entropy_disable ( source );
/* Print out sample values */
for ( j = 0 ; j < SAMPLE_BLOCKSIZE ; j++ ) {
printf ( "SAMPLE %s %d %d\n", source->name,
( i * SAMPLE_BLOCKSIZE + j ), samples[j] );
}
}
}
/**
* Generate entropy samples for external testing
*
*/
static void entropy_sample_test_exec ( void ) {
struct entropy_source *source;
/* Test each entropy source */
for_each_table_entry ( source, ENTROPY_SOURCES ) {
entropy_sample ( source );
}
}
/** Entropy sampling self-test */
struct self_test entropy_sample_test __self_test = {
.name = "entropy_sample",
.exec = entropy_sample_test_exec,
};