LXR uboot/post/lib_powerpc/complex.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2002
   4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5 */
   6
   7#include <common.h>
   8#include <irq_func.h>
   9
  10/*
  11 * CPU test
  12 * Complex calculations
  13 *
  14 * The calculations in this test are just a combination of simpler
  15 * calculations, but probably under different timing conditions, etc.
  16 */
  17
  18#include <post.h>
  19#include "cpu_asm.h"
  20
  21#if CONFIG_POST & CONFIG_SYS_POST_CPU
  22
  23extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
  24extern int cpu_post_complex_2_asm (int x, int n);
  25
  26  /*
  27   *     n
  28   *    SUM (a1 * a2 - a3) / a4 = n * result
  29   *    i=1
  30   */
  31static int cpu_post_test_complex_1 (void)
  32{
  33    int a1 = 666;
  34    int a2 = 667;
  35    int a3 = 668;
  36    int a4 = 66;
  37    int n = 100;
  38    int result = 6720; /* (a1 * a2 - a3) / a4 */
  39
  40    if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
  41    {
  42        return -1;
  43    }
  44
  45    return 0;
  46}
  47
  48  /*    (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
  49   */
  50static int cpu_post_test_complex_2 (void)
  51{
  52    int ret = -1;
  53    int x;
  54    int n;
  55    int k;
  56    int left;
  57    int right;
  58
  59    for (x = -8; x <= 8; x ++)
  60    {
  61        n = 9;
  62
  63        left = cpu_post_complex_2_asm(x, n);
  64        left *= 1 - x;
  65
  66        right = 1;
  67        for (k = 0; k <= n; k ++)
  68        {
  69            right *= x;
  70        }
  71        right = 1 - right;
  72
  73        if (left != right)
  74        {
  75            goto Done;
  76        }
  77    }
  78
  79    ret = 0;
  80    Done:
  81
  82    return ret;
  83}
  84
  85int cpu_post_test_complex (void)
  86{
  87    int ret = 0;
  88    int flag = disable_interrupts();
  89
  90    if (ret == 0)
  91    {
  92        ret = cpu_post_test_complex_1();
  93    }
  94
  95    if (ret == 0)
  96    {
  97        ret = cpu_post_test_complex_2();
  98    }
  99
 100    if (ret != 0)
 101    {
 102        post_log ("Error at complex test !\n");
 103    }
 104
 105    if (flag)
 106        enable_interrupts();
 107
 108    return ret;
 109}
 110
 111#endif
 112