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 CFG_POST & CFG_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