src/target/armv4_5_mmu.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 "log.h"
  25 #include "armv4_5_mmu.h"
  26
  27
  28 uint32_t armv4mmu_translate_va(struct target *target, struct armv4_5_mmu_common *armv4_5_mmu, uint32_t va, int *type, uint32_t *cb, int *domain, uint32_t *ap);
  29
  30 char* armv4_5_mmu_page_type_names[] =
  31 {
  32         "section", "large page", "small page", "tiny page"
  33 };
  34
  35 uint32_t armv4_5_mmu_translate_va(struct target *target, struct armv4_5_mmu_common *armv4_5_mmu, uint32_t va, int *type, uint32_t *cb, int *domain, uint32_t *ap)
  36 {
  37         uint32_t first_lvl_descriptor = 0x0;
  38         uint32_t second_lvl_descriptor = 0x0;
  39         uint32_t ttb = armv4_5_mmu->get_ttb(target);
  40
  41         armv4_5_mmu_read_physical(target, armv4_5_mmu,
  42                 (ttb & 0xffffc000) | ((va & 0xfff00000) >> 18),
  43                 4, 1, (uint8_t*)&first_lvl_descriptor);
  44         first_lvl_descriptor = target_buffer_get_u32(target, (uint8_t*)&first_lvl_descriptor);
  45
  46         LOG_DEBUG("1st lvl desc: %8.8" PRIx32 "", first_lvl_descriptor);
  47
  48         if ((first_lvl_descriptor & 0x3) == 0)
  49         {
  50                 *type = -1;
  51                 LOG_ERROR("Address translation failure");
  52                 return ERROR_TARGET_TRANSLATION_FAULT;
  53         }
  54
  55         if (!armv4_5_mmu->has_tiny_pages && ((first_lvl_descriptor & 0x3) == 3))
  56         {
  57                 *type = -1;
  58                 LOG_ERROR("Address translation failure");
  59                 return ERROR_TARGET_TRANSLATION_FAULT;
  60         }
  61
  62         /* domain is always specified in bits 8-5 */
  63         *domain = (first_lvl_descriptor & 0x1e0) >> 5;
  64
  65         if ((first_lvl_descriptor & 0x3) == 2)
  66         {
  67                 /* section descriptor */
  68                 *type = ARMV4_5_SECTION;
  69                 *cb = (first_lvl_descriptor & 0xc) >> 2;
  70                 *ap = (first_lvl_descriptor & 0xc00) >> 10;
  71                 return (first_lvl_descriptor & 0xfff00000) | (va & 0x000fffff);
  72         }
  73
  74         if ((first_lvl_descriptor & 0x3) == 1)
  75         {
  76                 /* coarse page table */
  77                 armv4_5_mmu_read_physical(target, armv4_5_mmu,
  78                         (first_lvl_descriptor & 0xfffffc00) | ((va & 0x000ff000) >> 10),
  79                         4, 1, (uint8_t*)&second_lvl_descriptor);
  80         }
  81         else if ((first_lvl_descriptor & 0x3) == 3)
  82         {
  83                 /* fine page table */
  84                 armv4_5_mmu_read_physical(target, armv4_5_mmu,
  85                         (first_lvl_descriptor & 0xfffff000) | ((va & 0x000ffc00) >> 8),
  86                         4, 1, (uint8_t*)&second_lvl_descriptor);
  87         }
  88
  89         second_lvl_descriptor = target_buffer_get_u32(target, (uint8_t*)&second_lvl_descriptor);
  90
  91         LOG_DEBUG("2nd lvl desc: %8.8" PRIx32 "", second_lvl_descriptor);
  92
  93         if ((second_lvl_descriptor & 0x3) == 0)
  94         {
  95                 *type = -1;
  96                 LOG_ERROR("Address translation failure");
  97                 return ERROR_TARGET_TRANSLATION_FAULT;
  98         }
  99
 100         /* cacheable/bufferable is always specified in bits 3-2 */
 101         *cb = (second_lvl_descriptor & 0xc) >> 2;
 102
 103         if ((second_lvl_descriptor & 0x3) == 1)
 104         {
 105                 /* large page descriptor */
 106                 *type = ARMV4_5_LARGE_PAGE;
 107                 *ap = (second_lvl_descriptor & 0xff0) >> 4;
 108                 return (second_lvl_descriptor & 0xffff0000) | (va & 0x0000ffff);
 109         }
 110
 111         if ((second_lvl_descriptor & 0x3) == 2)
 112         {
 113                 /* small page descriptor */
 114                 *type = ARMV4_5_SMALL_PAGE;
 115                 *ap = (second_lvl_descriptor & 0xff0) >> 4;
 116                 return (second_lvl_descriptor & 0xfffff000) | (va & 0x00000fff);
 117         }
 118
 119         if ((second_lvl_descriptor & 0x3) == 3)
 120         {
 121                 /* tiny page descriptor */
 122                 *type = ARMV4_5_TINY_PAGE;
 123                 *ap = (second_lvl_descriptor & 0x30) >> 4;
 124                 return (second_lvl_descriptor & 0xfffffc00) | (va & 0x000003ff);
 125         }
 126
 127         /* should not happen */
 128         *type = -1;
 129         LOG_ERROR("Address translation failure");
 130         return ERROR_TARGET_TRANSLATION_FAULT;
 131 }
 132
 133 int armv4_5_mmu_read_physical(struct target *target, struct armv4_5_mmu_common *armv4_5_mmu, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 134 {
 135         int retval;
 136
 137         if (target->state != TARGET_HALTED)
 138                 return ERROR_TARGET_NOT_HALTED;
 139
 140         /* disable MMU and data (or unified) cache */
 141         armv4_5_mmu->disable_mmu_caches(target, 1, 1, 0);
 142
 143         retval = armv4_5_mmu->read_memory(target, address, size, count, buffer);
 144
 145         /* reenable MMU / cache */
 146         armv4_5_mmu->enable_mmu_caches(target, armv4_5_mmu->mmu_enabled,
 147                 armv4_5_mmu->armv4_5_cache.d_u_cache_enabled,
 148                 armv4_5_mmu->armv4_5_cache.i_cache_enabled);
 149
 150         return retval;
 151 }
 152
 153 int armv4_5_mmu_write_physical(struct target *target, struct armv4_5_mmu_common *armv4_5_mmu, uint32_t address, uint32_t size, uint32_t count, uint8_t *buffer)
 154 {
 155         int retval;
 156
 157         if (target->state != TARGET_HALTED)
 158                 return ERROR_TARGET_NOT_HALTED;
 159
 160         /* disable MMU and data (or unified) cache */
 161         armv4_5_mmu->disable_mmu_caches(target, 1, 1, 0);
 162
 163         retval = armv4_5_mmu->write_memory(target, address, size, count, buffer);
 164
 165         /* reenable MMU / cache */
 166         armv4_5_mmu->enable_mmu_caches(target, armv4_5_mmu->mmu_enabled,
 167                 armv4_5_mmu->armv4_5_cache.d_u_cache_enabled,
 168                 armv4_5_mmu->armv4_5_cache.i_cache_enabled);
 169
 170         return retval;
 171 }