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-- ZPU

--

-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com

-- 

-- The FreeBSD license

-- 

-- Redistribution and use in source and binary forms, with or without

-- modification, are permitted provided that the following conditions

-- are met:

-- 

-- 1. Redistributions of source code must retain the above copyright

--    notice, this list of conditions and the following disclaimer.

-- 2. Redistributions in binary form must reproduce the above

--    copyright notice, this list of conditions and the following

--    disclaimer in the documentation and/or other materials

--    provided with the distribution.

-- 

-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY

-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- 

-- The views and conclusions contained in the software and documentation

-- are those of the authors and should not be interpreted as representing

-- official policies, either expressed or implied, of the ZPU Project.

library IEEE;

use IEEE.STD_LOGIC_1164.all;

use IEEE.STD_LOGIC_ARITH.all;

library work;

use work.zpu_config.all;

package zpupkg is

        -- This bit is set for read/writes to IO

        -- FIX!!! eventually this should be set to wordSize-1 so as to

        -- to make the address of IO independent of amount of memory

        -- reserved for CPU. Requires trivial tweaks in toolchain/runtime

        -- libraries.

        constant byteBits                       : integer := wordPower-3; -- # of bits in a word that addresses bytes

        constant maxAddrBit                     : integer := maxAddrBitIncIO-1;

        constant ioBit                          : integer := maxAddrBit+1;

        constant wordSize                       : integer := 2**wordPower;

        constant wordBytes                      : integer := wordSize/8;

        constant minAddrBit                     : integer := byteBits;

        -- configurable internal stack size. Probably going to be 16 after toolchain is done

        constant        stack_bits              : integer := 5;

        constant        stack_size              : integer := 2**stack_bits;

        component dualport_ram is

        port (clk : in std_logic;

                memAWriteEnable : in std_logic;

                memAAddr : in std_logic_vector(maxAddrBit downto minAddrBit);

                memAWrite : in std_logic_vector(wordSize-1 downto 0);

                memARead : out std_logic_vector(wordSize-1 downto 0);

                memBWriteEnable : in std_logic;

                memBAddr : in std_logic_vector(maxAddrBit downto minAddrBit);

                memBWrite : in std_logic_vector(wordSize-1 downto 0);

                memBRead : out std_logic_vector(wordSize-1 downto 0));

        end component;

        component dram is

                port (clk : in std_logic;

                        areset : in std_logic;

                        mem_writeEnable : in std_logic;

                        mem_readEnable : in std_logic;

                        mem_addr : in std_logic_vector(maxAddrBit downto 0);

                        mem_write : in std_logic_vector(wordSize-1 downto 0);

                        mem_read : out std_logic_vector(wordSize-1 downto 0);

                        mem_busy : out std_logic;

                        mem_writeMask : in std_logic_vector(wordBytes-1 downto 0));

        end component;

        component trace is

          port(

                clk         : in std_logic;

                begin_inst  : in std_logic;

                pc          : in std_logic_vector(maxAddrBitIncIO downto 0);

                        opcode          : in std_logic_vector(7 downto 0);

                        sp                      : in std_logic_vector(maxAddrBitIncIO downto minAddrBit);

                        memA            : in std_logic_vector(wordSize-1 downto 0);

                        memB            : in std_logic_vector(wordSize-1 downto 0);

                        busy         : in std_logic;

                        intSp           : in std_logic_vector(stack_bits-1 downto 0)

                        );

        end component;

        component zpu_core is

        generic (stack_address                  : integer := 1016);

    port ( clk : in std_logic;

                          sreset : in std_logic;

                          enable : in std_logic;

                          pc_bo  : out std_logic_vector(31 downto 0);

                          mem_req : out std_logic;

                          mem_we : out std_logic;

                          mem_ack : in std_logic;

                          mem_read : in std_logic_vector(wordSize-1 downto 0);

                          mem_write : out std_logic_vector(wordSize-1 downto 0);

                          out_mem_addr : out std_logic_vector(maxAddrBitIncIO downto 0);

                          mem_writeMask: out std_logic_vector(wordBytes-1 downto 0);

                          interrupt : in std_logic;

                          interrupt_ack : out std_logic;

                          break_o : out std_logic;

                          zpu_status : out std_logic_vector(63 downto 0));

        end component;

        component timer is

        port(

        clk             : in std_logic;

                areset                  : in std_logic;

                sample                  : in std_logic;

                reset                   : in std_logic;

                counter                 : out std_logic_vector(63 downto 0));

        end component;

        component  zpuio is

                port (  areset                  : in std_logic;

                                cpu_clk                 : in std_logic;

                                clk_status              : in std_logic_vector(2 downto 0);

                                cpu_din                 : in std_logic_vector(15 downto 0);

                                cpu_a                   : in std_logic_vector(20 downto 0);

                                cpu_we                  : in std_logic_vector(1 downto 0);

                                cpu_re                  : in std_logic;

                                cpu_dout                : inout std_logic_vector(15 downto 0));

        end component;

        -- opcode decode constants

        constant        OpCode_Im               : std_logic_vector(7 downto 7) := "1";

        constant        OpCode_StoreSP  : std_logic_vector(7 downto 5) := "010";

        constant        OpCode_LoadSP   : std_logic_vector(7 downto 5) := "011";

        constant        OpCode_Emulate  : std_logic_vector(7 downto 5) := "001";

        constant        OpCode_AddSP    : std_logic_vector(7 downto 4) := "0001";

        constant        OpCode_Short    : std_logic_vector(7 downto 4) := "0000";

        constant        OpCode_Break    : std_logic_vector(3 downto 0) := "0000";

        constant        OpCode_Shiftleft: std_logic_vector(3 downto 0) := "0001";

        constant        OpCode_PushSP   : std_logic_vector(3 downto 0) := "0010";

        constant        OpCode_PushInt  : std_logic_vector(3 downto 0) := "0011";

        constant        OpCode_PopPC    : std_logic_vector(3 downto 0) := "0100";

        constant        OpCode_Add              : std_logic_vector(3 downto 0) := "0101";

        constant        OpCode_And              : std_logic_vector(3 downto 0) := "0110";

        constant        OpCode_Or               : std_logic_vector(3 downto 0) := "0111";

        constant        OpCode_Load             : std_logic_vector(3 downto 0) := "1000";

        constant        OpCode_Not              : std_logic_vector(3 downto 0) := "1001";

        constant        OpCode_Flip             : std_logic_vector(3 downto 0) := "1010";

        constant        OpCode_Nop              : std_logic_vector(3 downto 0) := "1011";

        constant        OpCode_Store    : std_logic_vector(3 downto 0) := "1100";

        constant        OpCode_PopSP    : std_logic_vector(3 downto 0) := "1101";

        constant        OpCode_Compare  : std_logic_vector(3 downto 0) := "1110";

        constant        OpCode_PopInt   : std_logic_vector(3 downto 0) := "1111";

        constant        OpCode_Lessthan                         : std_logic_vector(5 downto 0) := conv_std_logic_vector(36, 6);

        constant        OpCode_Lessthanorequal          : std_logic_vector(5 downto 0) := conv_std_logic_vector(37, 6);

        constant        OpCode_Ulessthan                        : std_logic_vector(5 downto 0) := conv_std_logic_vector(38, 6);

        constant        OpCode_Ulessthanorequal         : std_logic_vector(5 downto 0) := conv_std_logic_vector(39, 6);

        constant        OpCode_Swap                                     : std_logic_vector(5 downto 0) := conv_std_logic_vector(40, 6);

        constant        OpCode_Mult                                     : std_logic_vector(5 downto 0) := conv_std_logic_vector(41, 6);

        constant        OpCode_Lshiftright                      : std_logic_vector(5 downto 0) := conv_std_logic_vector(42, 6);

        constant        OpCode_Ashiftleft                       : std_logic_vector(5 downto 0) := conv_std_logic_vector(43, 6);

        constant        OpCode_Ashiftright                      : std_logic_vector(5 downto 0) := conv_std_logic_vector(44, 6);

        constant        OpCode_Call                                     : std_logic_vector(5 downto 0) := conv_std_logic_vector(45, 6);

        constant        OpCode_Eq                                       : std_logic_vector(5 downto 0) := conv_std_logic_vector(46, 6);

        constant        OpCode_Neq                                      : std_logic_vector(5 downto 0) := conv_std_logic_vector(47, 6);

        constant        OpCode_Sub                                      : std_logic_vector(5 downto 0) := conv_std_logic_vector(49, 6);

        constant        OpCode_Loadb                            : std_logic_vector(5 downto 0) := conv_std_logic_vector(51, 6);

        constant        OpCode_Storeb                           : std_logic_vector(5 downto 0) := conv_std_logic_vector(52, 6);

        constant        OpCode_Eqbranch                         : std_logic_vector(5 downto 0) := conv_std_logic_vector(55, 6);

        constant        OpCode_Neqbranch                        : std_logic_vector(5 downto 0) := conv_std_logic_vector(56, 6);

        constant        OpCode_Poppcrel                         : std_logic_vector(5 downto 0) := conv_std_logic_vector(57, 6);

        constant        OpCode_Pushspadd                        : std_logic_vector(5 downto 0) := conv_std_logic_vector(61, 6);

        constant        OpCode_Mult16x16                        : std_logic_vector(5 downto 0) := conv_std_logic_vector(62, 6);

        constant        OpCode_Callpcrel                        : std_logic_vector(5 downto 0) := conv_std_logic_vector(63, 6);

        constant OpCode_Size            : integer := 8;

end zpupkg;