1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * (C) Copyright 2002
3*4882a593Smuzhiyun * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <common.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun * CPU test
12*4882a593Smuzhiyun * Complex calculations
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * The calculations in this test are just a combination of simpler
15*4882a593Smuzhiyun * calculations, but probably under different timing conditions, etc.
16*4882a593Smuzhiyun */
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <post.h>
19*4882a593Smuzhiyun #include "cpu_asm.h"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #if CONFIG_POST & CONFIG_SYS_POST_CPU
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun extern int cpu_post_complex_1_asm (int a1, int a2, int a3, int a4, int n);
24*4882a593Smuzhiyun extern int cpu_post_complex_2_asm (int x, int n);
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun /*
27*4882a593Smuzhiyun * n
28*4882a593Smuzhiyun * SUM (a1 * a2 - a3) / a4 = n * result
29*4882a593Smuzhiyun * i=1
30*4882a593Smuzhiyun */
cpu_post_test_complex_1(void)31*4882a593Smuzhiyun static int cpu_post_test_complex_1 (void)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun int a1 = 666;
34*4882a593Smuzhiyun int a2 = 667;
35*4882a593Smuzhiyun int a3 = 668;
36*4882a593Smuzhiyun int a4 = 66;
37*4882a593Smuzhiyun int n = 100;
38*4882a593Smuzhiyun int result = 6720; /* (a1 * a2 - a3) / a4 */
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (cpu_post_complex_1_asm(a1, a2, a3, a4, n) != n * result)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun return -1;
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun return 0;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun /* (1 + x + x^2 + ... + x^n) * (1 - x) = 1 - x^(n+1)
49*4882a593Smuzhiyun */
cpu_post_test_complex_2(void)50*4882a593Smuzhiyun static int cpu_post_test_complex_2 (void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun int ret = -1;
53*4882a593Smuzhiyun int x;
54*4882a593Smuzhiyun int n;
55*4882a593Smuzhiyun int k;
56*4882a593Smuzhiyun int left;
57*4882a593Smuzhiyun int right;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun for (x = -8; x <= 8; x ++)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun n = 9;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun left = cpu_post_complex_2_asm(x, n);
64*4882a593Smuzhiyun left *= 1 - x;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun right = 1;
67*4882a593Smuzhiyun for (k = 0; k <= n; k ++)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun right *= x;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun right = 1 - right;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun if (left != right)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun goto Done;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun ret = 0;
80*4882a593Smuzhiyun Done:
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return ret;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
cpu_post_test_complex(void)85*4882a593Smuzhiyun int cpu_post_test_complex (void)
86*4882a593Smuzhiyun {
87*4882a593Smuzhiyun int ret = 0;
88*4882a593Smuzhiyun int flag = disable_interrupts();
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun if (ret == 0)
91*4882a593Smuzhiyun {
92*4882a593Smuzhiyun ret = cpu_post_test_complex_1();
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun if (ret == 0)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun ret = cpu_post_test_complex_2();
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun if (ret != 0)
101*4882a593Smuzhiyun {
102*4882a593Smuzhiyun post_log ("Error at complex test !\n");
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun if (flag)
106*4882a593Smuzhiyun enable_interrupts();
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun return ret;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun #endif
112