src/target/nds32_tlb.c

   1 /***************************************************************************
   2  *   Copyright (C) 2013 Andes Technology                                   *
   3  *   Hsiangkai Wang <hkwang@andestech.com>                                 *
   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 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "nds32_aice.h"
  25 #include "nds32_tlb.h"
  26
  27 int nds32_probe_tlb(struct nds32 *nds32, const uint32_t virtual_address,
  28                 uint32_t *physical_address)
  29 {
  30         struct target *target = nds32->target;
  31         struct aice_port_s *aice = target_to_aice(target);
  32
  33         return aice_read_tlb(aice, virtual_address, physical_address);
  34 }
  35
  36 struct page_table_walker_info_s page_table_info[PAGE_SIZE_NUM] = {
  37         /* 4K page */
  38         {0xFFC00000, 20, 0x003FF000, 10, 0x00000FFF, 0xFFFFF000, 0xFFFFF000, 0xFFFFF000},
  39         /* 8K page */
  40         {0xFF000000, 22, 0x00FFE000, 11, 0x00001FFF, 0xFFFFF000, 0xFFFFE000, 0xFFFFE000},
  41 };
  42
  43 int nds32_walk_page_table(struct nds32 *nds32, const uint32_t virtual_address,
  44                 uint32_t *physical_address)
  45 {
  46         struct target *target = nds32->target;
  47         uint32_t value_mr1;
  48         uint32_t load_address;
  49         uint32_t L1_page_table_entry;
  50         uint32_t L2_page_table_entry;
  51         uint32_t page_size_index = nds32->mmu_config.default_min_page_size;
  52         struct page_table_walker_info_s *page_table_info_p =
  53                 &(page_table_info[page_size_index]);
  54
  55         /* Read L1 Physical Page Table */
  56         nds32_get_mapped_reg(nds32, MR1, &value_mr1);
  57         load_address = (value_mr1 & page_table_info_p->L1_base_mask) |
  58                 ((virtual_address & page_table_info_p->L1_offset_mask) >>
  59                  page_table_info_p->L1_offset_shift);
  60         /* load_address is physical address */
  61         nds32_read_buffer(target, load_address, 4, (uint8_t *)&L1_page_table_entry);
  62
  63         /* Read L2 Physical Page Table */
  64         if (L1_page_table_entry & 0x1) /* L1_PTE not present */
  65                 return ERROR_FAIL;
  66
  67         load_address = (L1_page_table_entry & page_table_info_p->L2_base_mask) |
  68                 ((virtual_address & page_table_info_p->L2_offset_mask) >>
  69                  page_table_info_p->L2_offset_shift);
  70         /* load_address is physical address */
  71         nds32_read_buffer(target, load_address, 4, (uint8_t *)&L2_page_table_entry);
  72
  73         if ((L2_page_table_entry & 0x1) != 0x1) /* L2_PTE not valid */
  74                 return ERROR_FAIL;
  75
  76         *physical_address = (L2_page_table_entry & page_table_info_p->ppn_mask) |
  77                 (virtual_address & page_table_info_p->va_offset_mask);
  78
  79         return ERROR_OK;
  80 }