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ad5bb451 WD |
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 | ||
ad5bb451 WD |
34 | #include <post.h> |
35 | #include "cpu_asm.h" | |
36 | ||
6d0f6bcf | 37 | #if CONFIG_POST & CONFIG_SYS_POST_CPU |
ad5bb451 WD |
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; | |
f2302d44 | 104 | int flag = disable_interrupts(); |
ad5bb451 WD |
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 | ||
f2302d44 SR |
121 | if (flag) |
122 | enable_interrupts(); | |
123 | ||
ad5bb451 WD |
124 | return ret; |
125 | } | |
126 | ||
127 | #endif |