post/lib_powerpc/cmp.c

   1 /*
   2  * (C) Copyright 2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9
  10 /*
  11  * CPU test
  12  * Integer compare instructions:        cmpw, cmplw
  13  *
  14  * To verify these instructions the test runs them with
  15  * different combinations of operands, reads the condition
  16  * register value and compares it with the expected one.
  17  * The test contains a pre-built table
  18  * containing the description of each test case: the instruction,
  19  * the values of the operands, the condition field to save
  20  * the result in and the expected result.
  21  */
  22
  23 #include <post.h>
  24 #include "cpu_asm.h"
  25
  26 #if CONFIG_POST & CONFIG_SYS_POST_CPU
  27
  28 extern void cpu_post_exec_12 (ulong *code, ulong *res, ulong op1, ulong op2);
  29
  30 static struct cpu_post_cmp_s
  31 {
  32     ulong cmd;
  33     ulong op1;
  34     ulong op2;
  35     ulong cr;
  36     ulong res;
  37 } cpu_post_cmp_table[] =
  38 {
  39     {
  40         OP_CMPW,
  41         123,
  42         123,
  43         2,
  44         0x02
  45     },
  46     {
  47         OP_CMPW,
  48         123,
  49         133,
  50         3,
  51         0x08
  52     },
  53     {
  54         OP_CMPW,
  55         123,
  56         -133,
  57         4,
  58         0x04
  59     },
  60     {
  61         OP_CMPLW,
  62         123,
  63         123,
  64         2,
  65         0x02
  66     },
  67     {
  68         OP_CMPLW,
  69         123,
  70         -133,
  71         3,
  72         0x08
  73     },
  74     {
  75         OP_CMPLW,
  76         123,
  77         113,
  78         4,
  79         0x04
  80     },
  81 };
  82 static unsigned int cpu_post_cmp_size = ARRAY_SIZE(cpu_post_cmp_table);
  83
  84 int cpu_post_test_cmp (void)
  85 {
  86     int ret = 0;
  87     unsigned int i;
  88     int flag = disable_interrupts();
  89
  90     for (i = 0; i < cpu_post_cmp_size && ret == 0; i++)
  91     {
  92         struct cpu_post_cmp_s *test = cpu_post_cmp_table + i;
  93         unsigned long code[] =
  94         {
  95             ASM_2C(test->cmd, test->cr, 3, 4),
  96             ASM_MFCR(3),
  97             ASM_BLR
  98         };
  99         ulong res;
 100
 101         cpu_post_exec_12 (code, & res, test->op1, test->op2);
 102
 103         ret = ((res >> (28 - 4 * test->cr)) & 0xe) == test->res ? 0 : -1;
 104
 105         if (ret != 0)
 106         {
 107             post_log ("Error at cmp test %d !\n", i);
 108         }
 109     }
 110
 111     if (flag)
 112         enable_interrupts();
 113
 114     return ret;
 115 }
 116
 117 #endif