post/lib_ppc/load.c

   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  * Load instructions:           lbz(x)(u), lhz(x)(u), lha(x)(u), lwz(x)(u)
  29  *
  30  * All operations are performed on a 16-byte array. The array
  31  * is 4-byte aligned. The base register points to offset 8.
  32  * The immediate offset (index register) ranges in [-8 ... +7].
  33  * The test cases are composed so that they do not
  34  * cause alignment exceptions.
  35  * The test contains a pre-built table describing all test cases.
  36  * The table entry contains:
  37  * the instruction opcode, the array contents, the value of the index
  38  * register and the expected value of the destination register.
  39  * After executing the instruction, the test verifies the
  40  * value of the destination register and the value of the base
  41  * register (it must change for "load with update" instructions).
  42  */
  43
  44 #ifdef CONFIG_POST
  45
  46 #include <post.h>
  47 #include "cpu_asm.h"
  48
  49 #if CONFIG_POST & CFG_POST_CPU
  50
  51 extern void cpu_post_exec_22w (ulong *code, ulong *op1, ulong op2, ulong *op3);
  52 extern void cpu_post_exec_21w (ulong *code, ulong *op1, ulong *op2);
  53
  54 static struct cpu_post_load_s
  55 {
  56     ulong cmd;
  57     uint width;
  58     int update;
  59     int index;
  60     ulong offset;
  61 } cpu_post_load_table[] =
  62 {
  63     {
  64         OP_LWZ,
  65         4,
  66         0,
  67         0,
  68         4
  69     },
  70     {
  71         OP_LHA,
  72         3,
  73         0,
  74         0,
  75         2
  76     },
  77     {
  78         OP_LHZ,
  79         2,
  80         0,
  81         0,
  82         2
  83     },
  84     {
  85         OP_LBZ,
  86         1,
  87         0,
  88         0,
  89         1
  90     },
  91     {
  92         OP_LWZU,
  93         4,
  94         1,
  95         0,
  96         4
  97     },
  98     {
  99         OP_LHAU,
 100         3,
 101         1,
 102         0,
 103         2
 104     },
 105     {
 106         OP_LHZU,
 107         2,
 108         1,
 109         0,
 110         2
 111     },
 112     {
 113         OP_LBZU,
 114         1,
 115         1,
 116         0,
 117         1
 118     },
 119     {
 120         OP_LWZX,
 121         4,
 122         0,
 123         1,
 124         4
 125     },
 126     {
 127         OP_LHAX,
 128         3,
 129         0,
 130         1,
 131         2
 132     },
 133     {
 134         OP_LHZX,
 135         2,
 136         0,
 137         1,
 138         2
 139     },
 140     {
 141         OP_LBZX,
 142         1,
 143         0,
 144         1,
 145         1
 146     },
 147     {
 148         OP_LWZUX,
 149         4,
 150         1,
 151         1,
 152         4
 153     },
 154     {
 155         OP_LHAUX,
 156         3,
 157         1,
 158         1,
 159         2
 160     },
 161     {
 162         OP_LHZUX,
 163         2,
 164         1,
 165         1,
 166         2
 167     },
 168     {
 169         OP_LBZUX,
 170         1,
 171         1,
 172         1,
 173         1
 174     },
 175 };
 176 static unsigned int cpu_post_load_size =
 177     sizeof (cpu_post_load_table) / sizeof (struct cpu_post_load_s);
 178
 179 int cpu_post_test_load (void)
 180 {
 181     int ret = 0;
 182     unsigned int i;
 183
 184     for (i = 0; i < cpu_post_load_size && ret == 0; i++)
 185     {
 186         struct cpu_post_load_s *test = cpu_post_load_table + i;
 187         uchar data[16] =
 188         { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
 189         ulong base0 = (ulong) (data + 8);
 190         ulong base = base0;
 191         ulong value;
 192
 193         if (test->index)
 194         {
 195             ulong code[] =
 196             {
 197                 ASM_12(test->cmd, 5, 3, 4),
 198                 ASM_BLR,
 199             };
 200
 201             cpu_post_exec_22w (code, &base, test->offset, &value);
 202         }
 203         else
 204         {
 205             ulong code[] =
 206             {
 207                 ASM_11I(test->cmd, 4, 3, test->offset),
 208                 ASM_BLR,
 209             };
 210
 211             cpu_post_exec_21w (code, &base, &value);
 212         }
 213
 214         if (ret == 0)
 215         {
 216            if (test->update)
 217                ret = base == base0 + test->offset ? 0 : -1;
 218            else
 219                ret = base == base0 ? 0 : -1;
 220         }
 221
 222         if (ret == 0)
 223         {
 224             switch (test->width)
 225             {
 226             case 1:
 227                 ret = *(uchar *)(base0 + test->offset) == value ?
 228                       0 : -1;
 229                 break;
 230             case 2:
 231                 ret = *(ushort *)(base0 + test->offset) == value ?
 232                       0 : -1;
 233                 break;
 234             case 3:
 235                 ret = *(short *)(base0 + test->offset) == value ?
 236                       0 : -1;
 237                 break;
 238             case 4:
 239                 ret = *(ulong *)(base0 + test->offset) == value ?
 240                       0 : -1;
 241                 break;
 242             }
 243         }
 244
 245         if (ret != 0)
 246         {
 247             post_log ("Error at load test %d !\n", i);
 248         }
 249     }
 250
 251     return ret;
 252 }
 253
 254 #endif
 255 #endif