mmuconfig.vhd

leon3 source code 虽然gaisler网站上有下载

------------------------------------------------------------------------------
--  This file is a part of the GRLIB VHDL IP LIBRARY
--  Copyright (C) 2003, Gaisler Research
--
--  This program is free software; you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation; either version 2 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program; if not, write to the Free Software
--  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
-----------------------------------------------------------------------------
-- Package: 	mmuconfig
-- File:	mmuconfig.vhd
-- Author:	Konrad Eisele, Jiri Gaisler, Gaisler Research
-- Description:	MMU types and constants
------------------------------------------------------------------------------

library ieee;
use ieee.std_logic_1164.all;
library grlib;
use grlib.stdlib.all;
library gaisler;

package mmuconfig is

constant M_CTX_SZ       : integer := 8;
constant M_ENT_MAX      : integer := 64;
constant XM_ENT_MAX_LOG : integer := log2(M_ENT_MAX);
constant M_ENT_MAX_LOG  : integer := XM_ENT_MAX_LOG;

type mmu_idcache is (id_icache, id_dcache);

-- ##############################################################
--     1.0 virtual address [sparc V8: p.243,Appx.H,Figure H-4]               
--     +--------+--------+--------+---------------+
--  a) | INDEX1 | INDEX2 | INDEX3 |    OFFSET     |  
--     +--------+--------+--------+---------------+
--      31    24 23    18 17    12 11            0

constant VA_I1_SZ : integer := 8;
constant VA_I2_SZ : integer := 6;
constant VA_I3_SZ : integer := 6;
constant VA_I_SZ  : integer := VA_I1_SZ+VA_I2_SZ+VA_I3_SZ;
constant VA_I_MAX : integer := 8;

constant VA_I1_U  : integer := 31;
constant VA_I1_D  : integer := 32-VA_I1_SZ;
constant VA_I2_U  : integer := 31-VA_I1_SZ;
constant VA_I2_D  : integer := 32-VA_I1_SZ-VA_I2_SZ;
constant VA_I3_U  : integer := 31-VA_I1_SZ-VA_I2_SZ;
constant VA_I3_D  : integer := 32-VA_I_SZ;
constant VA_I_U   : integer := 31;
constant VA_I_D   : integer := 32-VA_I_SZ;
constant VA_OFF_U : integer := 31-VA_I_SZ;
constant VA_OFF_D : integer := 0;

constant VA_OFFCTX_U : integer := 31;
constant VA_OFFCTX_D : integer := 0;
constant VA_OFFREG_U : integer := 31-VA_I1_SZ;
constant VA_OFFREG_D : integer := 0;
constant VA_OFFSEG_U : integer := 31-VA_I1_SZ-VA_I2_SZ;
constant VA_OFFSEG_D : integer := 0;
constant VA_OFFPAG_U : integer := 31-VA_I_SZ;
constant VA_OFFPAG_D : integer := 0;

-- ##############################################################
--     2.0 PAGE TABE DESCRIPTOR (PTD) [sparc V8: p.247,Appx.H,Figure H-7]                             
--                                                                  
--     +-------------------------------------------------+---+---+      
--     |    Page Table Pointer (PTP)                     | 0 | 0 |      
--     +-------------------------------------------------+---+---+      
--      31                                              2  1   0        
--
--     2.1 PAGE TABE ENTRY (PTE) [sparc V8: p.247,Appx.H,Figure H-8]
--                                                                                       
--     +-----------------------------+---+---+---+-----------+---+
--     |Physical Page Number (PPN)   | C | M | R |     ACC   | ET