nds32_tlb.c

Go to the documentation of this file.

// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2013 Andes Technology                                   *
 *   Hsiangkai Wang <hkwang@andestech.com>                                 *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "nds32_aice.h"
#include "nds32_tlb.h"
 
int nds32_probe_tlb(struct nds32 *nds32, const target_addr_t virtual_address,
        target_addr_t *physical_address)
{
    struct target *target = nds32->target;
    struct aice_port_s *aice = target_to_aice(target);
 
    return aice_read_tlb(aice, virtual_address, physical_address);
}
 
static struct page_table_walker_info_s page_table_info[PAGE_SIZE_NUM] = {
    /* 4K page */
    {0xFFC00000, 20, 0x003FF000, 10, 0x00000FFF, 0xFFFFF000, 0xFFFFF000, 0xFFFFF000},
    /* 8K page */
    {0xFF000000, 22, 0x00FFE000, 11, 0x00001FFF, 0xFFFFF000, 0xFFFFE000, 0xFFFFE000},
};
 
int nds32_walk_page_table(struct nds32 *nds32, const target_addr_t virtual_address,
        target_addr_t *physical_address)
{
    struct target *target = nds32->target;
    uint32_t value_mr1;
    uint32_t load_address;
    uint32_t l1_page_table_entry;
    uint32_t l2_page_table_entry;
    uint32_t page_size_index = nds32->mmu_config.default_min_page_size;
    struct page_table_walker_info_s *page_table_info_p =
        &(page_table_info[page_size_index]);
 
    /* Read L1 Physical Page Table */
    nds32_get_mapped_reg(nds32, MR1, &value_mr1);
    load_address = (value_mr1 & page_table_info_p->l1_base_mask) |
        ((virtual_address & page_table_info_p->l1_offset_mask) >>
         page_table_info_p->l1_offset_shift);
    /* load_address is physical address */
    nds32_read_buffer(target, load_address, 4, (uint8_t *)&l1_page_table_entry);
 
    /* Read L2 Physical Page Table */
    if (l1_page_table_entry & 0x1) /* L1_PTE not present */
        return ERROR_FAIL;
 
    load_address = (l1_page_table_entry & page_table_info_p->l2_base_mask) |
        ((virtual_address & page_table_info_p->l2_offset_mask) >>
         page_table_info_p->l2_offset_shift);
    /* load_address is physical address */
    nds32_read_buffer(target, load_address, 4, (uint8_t *)&l2_page_table_entry);
 
    if ((l2_page_table_entry & 0x1) != 0x1) /* L2_PTE not valid */
        return ERROR_FAIL;
 
    *physical_address = (l2_page_table_entry & page_table_info_p->ppn_mask) |
        (virtual_address & page_table_info_p->va_offset_mask);
 
    return ERROR_OK;
}