mmuconfig.vhd

uart_061109.rar

----------------------------------------------------------------------------
--  This file is a part of the LEON VHDL model
--  Copyright (C) 2003  Gaisler Research, all rights reserved
--
--  This library is free software; you can redistribute it and/or
--  modify it under the terms of the GNU Lesser General Public
--  License as published by the Free Software Foundation; either
--  version 2 of the License, or (at your option) any later version.
--
--  See the file COPYING.LGPL for the full details of the license.
----------------------------------------------------------------------------

-- Konrad Eisele<[e-mail]> ,2002  

library ieee;
use ieee.std_logic_1164.all;
use work.target.all;
use work.device.all;
use work.config.all;

package mmuconfig is

constant M_CTX_SZ       : integer := 8;
constant MMUCTX_BITS 	: integer := M_CTX_SZ * mmu_config.enable;

constant M_EN           : boolean := (mmu_config.enable = 1);   -- enable mmu
constant M_EN_DIAG      : boolean := mmu_config.tlb_diag;  --enable ASI diagnostic access
constant M_TLB_TYPE     : mmu_tlb_type := mmu_config.tlb_type;  -- eather split or combined
constant TLB_REP        : mmu_tlb_rep := mmu_config.tlb_rep;

constant M_ENT_I        : integer range 2 to 64 := mmu_config.itlbnum;   -- icache tlb entries: number
constant M_ENT_ILOG     : integer := log2(M_ENT_I);     -- icache tlb entries: address bits

constant M_ENT_D        : integer range 2 to 64 := mmu_config.dtlbnum;   -- dcache tlb entries: number
constant M_ENT_DLOG     : integer := log2(M_ENT_D);     -- dcache tlb entries: address bits

constant M_ENT_C        : integer range 2 to 64 := M_ENT_I;   -- i/dcache tlb entries: number
constant M_ENT_CLOG     : integer := M_ENT_ILOG;     -- i/dcache tlb entries: address bits

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