src/target/armv4_5_cache.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "armv4_5_cache.h"
  26 #include <helper/log.h>
  27
  28 int armv4_5_identify_cache(uint32_t cache_type_reg, struct armv4_5_cache_common *cache)
  29 {
  30         int size, assoc, M, len, multiplier;
  31
  32         cache->ctype = (cache_type_reg & 0x1e000000U) >> 25;
  33         cache->separate = (cache_type_reg & 0x01000000U) >> 24;
  34
  35         size = (cache_type_reg & 0x1c0000) >> 18;
  36         assoc = (cache_type_reg & 0x38000) >> 15;
  37         M = (cache_type_reg & 0x4000) >> 14;
  38         len = (cache_type_reg & 0x3000) >> 12;
  39         multiplier = 2 + M;
  40
  41         if ((assoc != 0) || (M != 1)) /* assoc 0 and M 1 means cache absent */ {
  42                 /* cache is present */
  43                 cache->d_u_size.linelen = 1 << (len + 3);
  44                 cache->d_u_size.associativity = multiplier << (assoc - 1);
  45                 cache->d_u_size.nsets = 1 << (size + 6 - assoc - len);
  46                 cache->d_u_size.cachesize = multiplier << (size + 8);
  47         } else {
  48                 /* cache is absent */
  49                 cache->d_u_size.linelen = -1;
  50                 cache->d_u_size.associativity = -1;
  51                 cache->d_u_size.nsets = -1;
  52                 cache->d_u_size.cachesize = -1;
  53         }
  54
  55         if (cache->separate) {
  56                 size = (cache_type_reg & 0x1c0) >> 6;
  57                 assoc = (cache_type_reg & 0x38) >> 3;
  58                 M = (cache_type_reg & 0x4) >> 2;
  59                 len = (cache_type_reg & 0x3);
  60                 multiplier = 2 + M;
  61
  62                 if ((assoc != 0) || (M != 1)) /* assoc 0 and M 1 means cache absent */ {
  63                         /* cache is present */
  64                         cache->i_size.linelen = 1 << (len + 3);
  65                         cache->i_size.associativity = multiplier << (assoc - 1);
  66                         cache->i_size.nsets = 1 << (size + 6 - assoc - len);
  67                         cache->i_size.cachesize = multiplier << (size + 8);
  68                 } else {
  69                         /* cache is absent */
  70                         cache->i_size.linelen = -1;
  71                         cache->i_size.associativity = -1;
  72                         cache->i_size.nsets = -1;
  73                         cache->i_size.cachesize = -1;
  74                 }
  75         } else
  76                 cache->i_size = cache->d_u_size;
  77
  78         return ERROR_OK;
  79 }
  80
  81 int armv4_5_handle_cache_info_command(struct command_context *cmd_ctx, struct armv4_5_cache_common *armv4_5_cache)
  82 {
  83         if (armv4_5_cache->ctype == -1) {
  84                 command_print(cmd_ctx, "cache not yet identified");
  85                 return ERROR_OK;
  86         }
  87
  88         command_print(cmd_ctx, "cache type: 0x%1.1x, %s", armv4_5_cache->ctype,
  89                 (armv4_5_cache->separate) ? "separate caches" : "unified cache");
  90
  91         command_print(cmd_ctx, "D-Cache: linelen %i, associativity %i, nsets %i, cachesize 0x%x",
  92                 armv4_5_cache->d_u_size.linelen,
  93                 armv4_5_cache->d_u_size.associativity,
  94                 armv4_5_cache->d_u_size.nsets,
  95                 armv4_5_cache->d_u_size.cachesize);
  96
  97         command_print(cmd_ctx, "I-Cache: linelen %i, associativity %i, nsets %i, cachesize 0x%x",
  98                 armv4_5_cache->i_size.linelen,
  99                 armv4_5_cache->i_size.associativity,
 100                 armv4_5_cache->i_size.nsets,
 101                 armv4_5_cache->i_size.cachesize);
 102
 103         return ERROR_OK;
 104 }