src/target/armv4_5_mmu.c

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2005 by Dominic Rath                                    *
   5  *   Dominic.Rath@gmx.de                                                   *
   6  ***************************************************************************/
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include "config.h"
  10 #endif
  11
  12 #include <helper/log.h>
  13 #include "target.h"
  14 #include "armv4_5_mmu.h"
  15
  16 int armv4_5_mmu_translate_va(struct target *target,
  17                 struct armv4_5_mmu_common *armv4_5_mmu, uint32_t va, uint32_t *cb, uint32_t *val)
  18 {
  19         uint32_t first_lvl_descriptor = 0x0;
  20         uint32_t second_lvl_descriptor = 0x0;
  21         uint32_t ttb;
  22         int retval;
  23         retval = armv4_5_mmu->get_ttb(target, &ttb);
  24         if (retval != ERROR_OK)
  25                 return retval;
  26
  27         retval = armv4_5_mmu_read_physical(target, armv4_5_mmu,
  28                 (ttb & 0xffffc000) | ((va & 0xfff00000) >> 18),
  29                 4, 1, (uint8_t *)&first_lvl_descriptor);
  30         if (retval != ERROR_OK)
  31                 return retval;
  32         first_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)&first_lvl_descriptor);
  33
  34         LOG_DEBUG("1st lvl desc: %8.8" PRIx32 "", first_lvl_descriptor);
  35
  36         if ((first_lvl_descriptor & 0x3) == 0) {
  37                 LOG_ERROR("Address translation failure");
  38                 return ERROR_TARGET_TRANSLATION_FAULT;
  39         }
  40
  41         if (!armv4_5_mmu->has_tiny_pages && ((first_lvl_descriptor & 0x3) == 3)) {
  42                 LOG_ERROR("Address translation failure");
  43                 return ERROR_TARGET_TRANSLATION_FAULT;
  44         }
  45
  46         if ((first_lvl_descriptor & 0x3) == 2) {
  47                 /* section descriptor */
  48                 *cb = (first_lvl_descriptor & 0xc) >> 2;
  49                 *val = (first_lvl_descriptor & 0xfff00000) | (va & 0x000fffff);
  50                 return ERROR_OK;
  51         }
  52
  53         if ((first_lvl_descriptor & 0x3) == 1) {
  54                 /* coarse page table */
  55                 retval = armv4_5_mmu_read_physical(target, armv4_5_mmu,
  56                         (first_lvl_descriptor & 0xfffffc00) | ((va & 0x000ff000) >> 10),
  57                         4, 1, (uint8_t *)&second_lvl_descriptor);
  58                 if (retval != ERROR_OK)
  59                         return retval;
  60         } else if ((first_lvl_descriptor & 0x3) == 3) {
  61                 /* fine page table */
  62                 retval = armv4_5_mmu_read_physical(target, armv4_5_mmu,
  63                         (first_lvl_descriptor & 0xfffff000) | ((va & 0x000ffc00) >> 8),
  64                         4, 1, (uint8_t *)&second_lvl_descriptor);
  65                 if (retval != ERROR_OK)
  66                         return retval;
  67         }
  68
  69         second_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)&second_lvl_descriptor);
  70
  71         LOG_DEBUG("2nd lvl desc: %8.8" PRIx32 "", second_lvl_descriptor);
  72
  73         if ((second_lvl_descriptor & 0x3) == 0) {
  74                 LOG_ERROR("Address translation failure");
  75                 return ERROR_TARGET_TRANSLATION_FAULT;
  76         }
  77
  78         /* cacheable/bufferable is always specified in bits 3-2 */
  79         *cb = (second_lvl_descriptor & 0xc) >> 2;
  80
  81         if ((second_lvl_descriptor & 0x3) == 1) {
  82                 /* large page descriptor */
  83                 *val = (second_lvl_descriptor & 0xffff0000) | (va & 0x0000ffff);
  84                 return ERROR_OK;
  85         }
  86
  87         if ((second_lvl_descriptor & 0x3) == 2) {
  88                 /* small page descriptor */
  89                 *val = (second_lvl_descriptor & 0xfffff000) | (va & 0x00000fff);
  90                 return ERROR_OK;
  91         }
  92
  93         if ((second_lvl_descriptor & 0x3) == 3) {
  94                 /* tiny page descriptor */
  95                 *val = (second_lvl_descriptor & 0xfffffc00) | (va & 0x000003ff);
  96                 return ERROR_OK;
  97         }
  98
  99         /* should not happen */
 100         LOG_ERROR("Address translation failure");
 101         return ERROR_TARGET_TRANSLATION_FAULT;
 102 }
 103
 104 int armv4_5_mmu_read_physical(struct target *target,
 105                 struct armv4_5_mmu_common *armv4_5_mmu, uint32_t address,
 106                 uint32_t size, uint32_t count, uint8_t *buffer)
 107 {
 108         int retval;
 109
 110         if (target->state != TARGET_HALTED)
 111                 return ERROR_TARGET_NOT_HALTED;
 112
 113         /* disable MMU and data (or unified) cache */
 114         retval = armv4_5_mmu->disable_mmu_caches(target, 1, 1, 0);
 115         if (retval != ERROR_OK)
 116                 return retval;
 117
 118         retval = armv4_5_mmu->read_memory(target, address, size, count, buffer);
 119         if (retval != ERROR_OK)
 120                 return retval;
 121
 122         /* reenable MMU / cache */
 123         retval = armv4_5_mmu->enable_mmu_caches(target, armv4_5_mmu->mmu_enabled,
 124                 armv4_5_mmu->armv4_5_cache.d_u_cache_enabled,
 125                 armv4_5_mmu->armv4_5_cache.i_cache_enabled);
 126         if (retval != ERROR_OK)
 127                 return retval;
 128
 129         return retval;
 130 }
 131
 132 int armv4_5_mmu_write_physical(struct target *target,
 133                 struct armv4_5_mmu_common *armv4_5_mmu, uint32_t address,
 134                 uint32_t size, uint32_t count, const uint8_t *buffer)
 135 {
 136         int retval;
 137
 138         if (target->state != TARGET_HALTED)
 139                 return ERROR_TARGET_NOT_HALTED;
 140
 141         /* disable MMU and data (or unified) cache */
 142         retval = armv4_5_mmu->disable_mmu_caches(target, 1, 1, 0);
 143         if (retval != ERROR_OK)
 144                 return retval;
 145
 146         retval = armv4_5_mmu->write_memory(target, address, size, count, buffer);
 147         if (retval != ERROR_OK)
 148                 return retval;
 149
 150         /* reenable MMU / cache */
 151         retval = armv4_5_mmu->enable_mmu_caches(target, armv4_5_mmu->mmu_enabled,
 152                 armv4_5_mmu->armv4_5_cache.d_u_cache_enabled,
 153                 armv4_5_mmu->armv4_5_cache.i_cache_enabled);
 154         if (retval != ERROR_OK)
 155                 return retval;
 156
 157         return retval;
 158 }