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  • /*
     * (C) Copyright 2002
     * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
     *
    
     * SPDX-License-Identifier:	GPL-2.0+
    
     */
    
    #include <common.h>
    
    /*
     * CPU test
     * Complex calculations
     *
     * The calculations in this test are just a combination of simpler
     * calculations, but probably under different timing conditions, etc.
     */
    
    #include <post.h>
    #include "cpu_asm.h"
    
    
    #if CONFIG_POST & CONFIG_SYS_POST_CPU
    
    
    extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
    extern int cpu_post_complex_2_asm (int x, int n);
    
      /*
       *     n
       *	SUM (a1 * a2 - a3) / a4 = n * result
       *    i=1
       */
    static int cpu_post_test_complex_1 (void)
    {
        int a1 = 666;
        int a2 = 667;
        int a3 = 668;
        int a4 = 66;
        int n = 100;
        int result = 6720; /* (a1 * a2 - a3) / a4 */
    
        if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
        {
    	return -1;
        }
    
        return 0;
    }
    
      /*	(1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
       */
    static int cpu_post_test_complex_2 (void)
    {
        int ret = -1;
        int x;
        int n;
        int k;
        int left;
        int right;
    
        for (x = -8; x <= 8; x ++)
        {
    	n = 9;
    
    	left = cpu_post_complex_2_asm(x, n);
    	left *= 1 - x;
    
    	right = 1;
    	for (k = 0; k <= n; k ++)
    	{
    	    right *= x;
    	}
    	right = 1 - right;
    
    	if (left != right)
    	{
    	    goto Done;
    	}
        }
    
        ret = 0;
        Done:
    
        return ret;
    }
    
    int cpu_post_test_complex (void)
    {
        int ret = 0;
    
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        int flag = disable_interrupts();
    
    
        if (ret == 0)
        {
    	ret = cpu_post_test_complex_1();
        }
    
        if (ret == 0)
        {
    	ret = cpu_post_test_complex_2();
        }
    
        if (ret != 0)
        {
    	post_log ("Error at complex test !\n");
        }
    
    
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        if (flag)
    	enable_interrupts();