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  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "armv4_5_cache.h"
  25 #include "log.h"
  26
  27 int armv4_5_identify_cache(u32 cache_type_reg, armv4_5_cache_common_t *cache)
  28 {
  29         int size, assoc, M, len, multiplier;
  30
  31         cache->ctype = (cache_type_reg & 0x1e000000U) >> 25;
  32         cache->separate = (cache_type_reg & 0x01000000U) >> 24;
  33
  34         size = (cache_type_reg & 0x1c0000) >> 18;
  35         assoc = (cache_type_reg & 0x38000) >> 15;
  36         M = (cache_type_reg & 0x4000) >> 14;
  37         len = (cache_type_reg & 0x3000) >> 12;
  38         multiplier = 2 + M;
  39
  40         if ((assoc != 0) || (M != 1)) /* assoc 0 and M 1 means cache absent */
  41         {
  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         }
  48         else
  49         {
  50                 /* cache is absent */
  51                 cache->d_u_size.linelen = -1;
  52                 cache->d_u_size.associativity = -1;
  53                 cache->d_u_size.nsets = -1;
  54                 cache->d_u_size.cachesize = -1;
  55         }
  56
  57         if (cache->separate)
  58         {
  59                 size = (cache_type_reg & 0x1c0) >> 6;
  60                 assoc = (cache_type_reg & 0x38) >> 3;
  61                 M = (cache_type_reg & 0x4) >> 2;
  62                 len = (cache_type_reg & 0x3);
  63                 multiplier = 2 + M;
  64
  65                 if ((assoc != 0) || (M != 1)) /* assoc 0 and M 1 means cache absent */
  66                 {
  67                         /* cache is present */
  68                         cache->i_size.linelen = 1 << (len + 3);
  69                         cache->i_size.associativity = multiplier << (assoc - 1);
  70                         cache->i_size.nsets = 1 << (size + 6 - assoc - len);
  71                         cache->i_size.cachesize = multiplier << (size + 8);
  72                 }
  73                 else
  74                 {
  75                         /* cache is absent */
  76                         cache->i_size.linelen = -1;
  77                         cache->i_size.associativity = -1;
  78                         cache->i_size.nsets = -1;
  79                         cache->i_size.cachesize = -1;
  80                 }
  81         }
  82         else
  83         {
  84                 cache->i_size = cache->d_u_size;
  85         }
  86
  87         return ERROR_OK;
  88 }
  89
  90 int armv4_5_handle_cache_info_command(struct command_context_s *cmd_ctx, armv4_5_cache_common_t *armv4_5_cache)
  91 {
  92         if (armv4_5_cache->ctype == -1)
  93         {
  94                 command_print(cmd_ctx, "cache not yet identified");
  95                 return ERROR_OK;
  96         }
  97
  98         command_print(cmd_ctx, "cache type: 0x%1.1x, %s", armv4_5_cache->ctype,
  99                 (armv4_5_cache->separate) ? "separate caches" : "unified cache");
 100
 101         command_print(cmd_ctx, "D-Cache: linelen %i, associativity %i, nsets %i, cachesize 0x%x",
 102                 armv4_5_cache->d_u_size.linelen,
 103                 armv4_5_cache->d_u_size.associativity,
 104                 armv4_5_cache->d_u_size.nsets,
 105                 armv4_5_cache->d_u_size.cachesize);
 106
 107         command_print(cmd_ctx, "I-Cache: linelen %i, associativity %i, nsets %i, cachesize 0x%x",
 108                 armv4_5_cache->i_size.linelen,
 109                 armv4_5_cache->i_size.associativity,
 110                 armv4_5_cache->i_size.nsets,
 111                 armv4_5_cache->i_size.cachesize);
 112
 113         return ERROR_OK;
 114 }