129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/*
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* This file is part of the SPL: Solaris Porting Layer.
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*
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* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory
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* Written by:
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* Brian Behlendorf <behlendorf1@llnl.gov>,
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* Herb Wartens <wartens2@llnl.gov>,
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* Jim Garlick <garlick@llnl.gov>
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* UCRL-CODE-235197
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "splat-internal.h"
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#define SPLAT_KRNG_NAME "krng"
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#define SPLAT_KRNG_DESC "Kernel Random Number Generator Tests"
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#define SPLAT_KRNG_TEST1_ID 0x0301
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#define SPLAT_KRNG_TEST1_NAME "freq"
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#define SPLAT_KRNG_TEST1_DESC "Frequency Test"
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#define KRNG_NUM_BITS 1048576
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#define KRNG_NUM_BYTES (KRNG_NUM_BITS >> 3)
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#define KRNG_NUM_BITS_DIV2 (KRNG_NUM_BITS >> 1)
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#define KRNG_ERROR_RANGE 2097
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/* Random Number Generator Tests
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There can be meny more tests on quality of the
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random number generator. For now we are only
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testing the frequency of particular bits.
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We could also test consecutive sequences,
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randomness within a particular block, etc.
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but is probably not necessary for our purposes */
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static int
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splat_krng_test1(struct file *file, void *arg)
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{
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uint8_t *buf;
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int i, j, diff, num = 0, rc = 0;
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buf = kmalloc(sizeof(*buf) * KRNG_NUM_BYTES, GFP_KERNEL);
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if (buf == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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memset(buf, 0, sizeof(*buf) * KRNG_NUM_BYTES);
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/* Always succeeds */
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random_get_pseudo_bytes(buf, sizeof(uint8_t) * KRNG_NUM_BYTES);
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for (i = 0; i < KRNG_NUM_BYTES; i++) {
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uint8_t tmp = buf[i];
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for (j = 0; j < 8; j++) {
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uint8_t tmp2 = ((tmp >> j) & 0x01);
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if (tmp2 == 1) {
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num++;
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}
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}
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}
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kfree(buf);
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diff = KRNG_NUM_BITS_DIV2 - num;
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if (diff < 0)
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diff *= -1;
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splat_print(file, "Test 1 Number of ones: %d\n", num);
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splat_print(file, "Test 1 Difference from expected: %d Allowed: %d\n",
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diff, KRNG_ERROR_RANGE);
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if (diff > KRNG_ERROR_RANGE)
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rc = -ERANGE;
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out:
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return rc;
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}
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splat_subsystem_t *
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splat_krng_init(void)
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{
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splat_subsystem_t *sub;
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sub = kmalloc(sizeof(*sub), GFP_KERNEL);
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if (sub == NULL)
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return NULL;
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memset(sub, 0, sizeof(*sub));
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strncpy(sub->desc.name, SPLAT_KRNG_NAME, SPLAT_NAME_SIZE);
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strncpy(sub->desc.desc, SPLAT_KRNG_DESC, SPLAT_DESC_SIZE);
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INIT_LIST_HEAD(&sub->subsystem_list);
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INIT_LIST_HEAD(&sub->test_list);
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spin_lock_init(&sub->test_lock);
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sub->desc.id = SPLAT_SUBSYSTEM_KRNG;
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SPLAT_TEST_INIT(sub, SPLAT_KRNG_TEST1_NAME, SPLAT_KRNG_TEST1_DESC,
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SPLAT_KRNG_TEST1_ID, splat_krng_test1);
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return sub;
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}
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void
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splat_krng_fini(splat_subsystem_t *sub)
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{
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ASSERT(sub);
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SPLAT_TEST_FINI(sub, SPLAT_KRNG_TEST1_ID);
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kfree(sub);
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}
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int
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splat_krng_id(void) {
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return SPLAT_SUBSYSTEM_KRNG;
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}
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