post/lib_ppc/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
  39 extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
  40 extern 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    */
  47 static 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    */
  66 static 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
 101 int 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