LXR uboot/post/lib_powerpc/complex.c

   1/*
   2 * (C) Copyright 2002
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * See file CREDITS for list of people who contributed to this
   6 * project.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of
  11 * the License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21 * MA 02111-1307 USA
  22 */
  23
  24#include <common.h>
  25
  26/*
  27 * CPU test
  28 * Complex calculations
  29 *
  30 * The calculations in this test are just a combination of simpler
  31 * calculations, but probably under different timing conditions, etc.
  32 */
  33
  34#include <post.h>
  35#include "cpu_asm.h"
  36
  37#if CONFIG_POST & CONFIG_SYS_POST_CPU
  38
  39extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
  40extern int cpu_post_complex_2_asm (int x, int n);
  41
  42  /*
  43   *     n
  44   *    SUM (a1 * a2 - a3) / a4 = n * result
  45   *    i=1
  46   */
  47static int cpu_post_test_complex_1 (void)
  48{
  49    int a1 = 666;
  50    int a2 = 667;
  51    int a3 = 668;
  52    int a4 = 66;
  53    int n = 100;
  54    int result = 6720; /* (a1 * a2 - a3) / a4 */
  55
  56    if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
  57    {
  58        return -1;
  59    }
  60
  61    return 0;
  62}
  63
  64  /*    (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
  65   */
  66static int cpu_post_test_complex_2 (void)
  67{
  68    int ret = -1;
  69    int x;
  70    int n;
  71    int k;
  72    int left;
  73    int right;
  74
  75    for (x = -8; x <= 8; x ++)
  76    {
  77        n = 9;
  78
  79        left = cpu_post_complex_2_asm(x, n);
  80        left *= 1 - x;
  81
  82        right = 1;
  83        for (k = 0; k <= n; k ++)
  84        {
  85            right *= x;
  86        }
  87        right = 1 - right;
  88
  89        if (left != right)
  90        {
  91            goto Done;
  92        }
  93    }
  94
  95    ret = 0;
  96    Done:
  97
  98    return ret;
  99}
 100
 101int cpu_post_test_complex (void)
 102{
 103    int ret = 0;
 104    int flag = disable_interrupts();
 105
 106    if (ret == 0)
 107    {
 108        ret = cpu_post_test_complex_1();
 109    }
 110
 111    if (ret == 0)
 112    {
 113        ret = cpu_post_test_complex_2();
 114    }
 115
 116    if (ret != 0)
 117    {
 118        post_log ("Error at complex test !\n");
 119    }
 120
 121    if (flag)
 122        enable_interrupts();
 123
 124    return ret;
 125}
 126
 127#endif
 128