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