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---------------------------------------------------------------------

-- TITLE: Plasma Misc. Package

-- AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

-- DATE CREATED: 2/15/01

-- FILENAME: mlite_pack.vhd

-- PROJECT: Plasma CPU core

-- COPYRIGHT: Software placed into the public domain by the author.

--    Software 'as is' without warranty.  Author liable for nothing.

-- DESCRIPTION:

--    Data types, constants, and add functions needed for the Plasma CPU.

---------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

package mlite_pack is

   constant ZERO          : std_logic_vector(31 downto 0) :=

      "00000000000000000000000000000000";

   constant ONES          : std_logic_vector(31 downto 0) :=

      "11111111111111111111111111111111";

   --make HIGH_Z equal to ZERO if compiler complains

   constant HIGH_Z        : std_logic_vector(31 downto 0) :=

      "ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ";

--   type alu_function_type is (alu_nothing, alu_add, alu_subtract, 

--      alu_less_than, alu_less_than_signed, 

--      alu_or, alu_and, alu_xor, alu_nor);

   subtype alu_function_type is std_logic_vector(3 downto 0);

   constant alu_nothing   : alu_function_type := "0000";

   constant alu_add       : alu_function_type := "0001";

   constant alu_subtract  : alu_function_type := "0010";

   constant alu_less_than : alu_function_type := "0011";

   constant alu_less_than_signed : alu_function_type := "0100";

   constant alu_or        : alu_function_type := "0101";

   constant alu_and       : alu_function_type := "0110";

   constant alu_xor       : alu_function_type := "0111";

   constant alu_nor       : alu_function_type := "1000";

--   type shift_function_type is (

--      shift_nothing, shift_left_unsigned,

--      shift_right_signed, do_right_unsigned);

   subtype shift_function_type is std_logic_vector(1 downto 0);

   constant shift_nothing        : shift_function_type := "00";

   constant shift_left_unsigned  : shift_function_type := "01";

   constant shift_right_signed   : shift_function_type := "11";

   constant shift_right_unsigned : shift_function_type := "10";

--   type mult_function_type is (

--      mult_nothing, mult_read_lo, mult_read_hi, mult_write_lo, 

--      mult_write_hi, mult_mult, mult_divide, mult_signed_divide);

   subtype mult_function_type is std_logic_vector(3 downto 0);

   constant mult_nothing       : mult_function_type := "0000";

   constant mult_read_lo       : mult_function_type := "0001";

   constant mult_read_hi       : mult_function_type := "0010";

   constant mult_write_lo      : mult_function_type := "0011";

   constant mult_write_hi      : mult_function_type := "0100";

   constant mult_mult          : mult_function_type := "0101";

   constant mult_signed_mult   : mult_function_type := "0110";

   constant mult_divide        : mult_function_type := "0111";

   constant mult_signed_divide : mult_function_type := "1000";

--   type a_source_type is (from_reg_source, from_imm10_6);

   subtype a_source_type is std_logic_vector(1 downto 0);

   constant a_from_reg_source : a_source_type := "00";

   constant a_from_imm10_6    : a_source_type := "01";

   constant a_from_pc         : a_source_type := "10";

--   type b_source_type is (from_reg_target, from_imm, from_signed_imm);

   subtype b_source_type is std_logic_vector(1 downto 0);

   constant b_from_reg_target : b_source_type := "00";

   constant b_from_imm        : b_source_type := "01";

   constant b_from_signed_imm : b_source_type := "10";

   constant b_from_immX4      : b_source_type := "11";

--   type c_source_type is (from_null, from_alu, from_shift, 

--      from_mult, from_memory, from_pc, from_imm_shift16,

--      from_reg_source_nez, from_reg_source_eqz);

   subtype c_source_type is std_logic_vector(2 downto 0);

   constant c_from_null       : c_source_type := "000";

   constant c_from_alu        : c_source_type := "001";

   constant c_from_shift      : c_source_type := "001"; --same as alu

   constant c_from_mult       : c_source_type := "001"; --same as alu

   constant c_from_memory     : c_source_type := "010";

   constant c_from_pc         : c_source_type := "011";

   constant c_from_pc_plus4   : c_source_type := "100";

   constant c_from_imm_shift16: c_source_type := "101";

   constant c_from_reg_sourcen: c_source_type := "110";

--   type pc_source_type is (from_inc4, from_inc8, from_reg_source, 

--      from_opcode25_0, from_branch, from_lbranch);

   subtype pc_source_type is std_logic_vector(1 downto 0);

   constant from_inc4       : pc_source_type := "00";

   constant from_opcode25_0 : pc_source_type := "01";

   constant from_branch     : pc_source_type := "10";

   constant from_lbranch    : pc_source_type := "11";

   subtype branch_function_type is std_logic_vector(2 downto 0);

   constant branch_ltz : branch_function_type := "000";

   constant branch_lez : branch_function_type := "001";

   constant branch_eq  : branch_function_type := "010";

   constant branch_ne  : branch_function_type := "011";

   constant branch_gez : branch_function_type := "100";

   constant branch_gtz : branch_function_type := "101";

   constant branch_yes : branch_function_type := "110";

   -- mode(32=1,16=2,8=3), signed, write

   subtype mem_source_type is std_logic_vector(3 downto 0);

   constant mem_fetch   : mem_source_type := "0000";

   constant mem_read32  : mem_source_type := "0100";

   constant mem_write32 : mem_source_type := "0101";

   constant mem_read16  : mem_source_type := "1000";

   constant mem_read16s : mem_source_type := "1010";

   constant mem_write16 : mem_source_type := "1001";

   constant mem_read8   : mem_source_type := "1100";

   constant mem_read8s  : mem_source_type := "1110";

   constant mem_write8  : mem_source_type := "1101";

   function bv_to_integer(bv: in std_logic_vector) return integer;

   function bv_adder(a     : in std_logic_vector(32 downto 0);

                     b     : in std_logic_vector(32 downto 0);

                     do_add: in std_logic) return std_logic_vector;

   function bv_adder_lookahead(

                     a     : in std_logic_vector(32 downto 0);

                     b     : in std_logic_vector(32 downto 0);

                     do_add: in std_logic) return std_logic_vector;

   function bv_negate(a : in std_logic_vector) return std_logic_vector;

   function bv_increment(a : in std_logic_vector(31 downto 2)

                     ) return std_logic_vector;

   function bv_inc6(a : in std_logic_vector

                     ) return std_logic_vector;

   -- For Altera

   COMPONENT lpm_add_sub

      GENERIC (

         lpm_width     : NATURAL;

         lpm_direction : STRING := "UNUSED";

         lpm_type      : STRING;

         lpm_hint      : STRING);

      PORT (

         dataa   : IN STD_LOGIC_VECTOR (lpm_width-1 DOWNTO 0);

         add_sub : IN STD_LOGIC ;

         datab   : IN STD_LOGIC_VECTOR (lpm_width-1 DOWNTO 0);

         result  : OUT STD_LOGIC_VECTOR (lpm_width-1 DOWNTO 0));

   END COMPONENT;

   -- For Altera

   COMPONENT lpm_ram_dp

      GENERIC (

         lpm_width        : NATURAL;

         lpm_widthad      : NATURAL;

         rden_used        : STRING;

         intended_device_family : STRING;

         lpm_indata       : STRING;

         lpm_wraddress_control          : STRING;

         lpm_rdaddress_control          : STRING;

         lpm_outdata      : STRING;

         use_eab          : STRING;

         lpm_type         : STRING);

      PORT (

         wren      : IN STD_LOGIC ;

         wrclock   : IN STD_LOGIC ;

         q         : OUT STD_LOGIC_VECTOR (lpm_width-1 DOWNTO 0);

         data      : IN STD_LOGIC_VECTOR (lpm_width-1 DOWNTO 0);

         rdaddress : IN STD_LOGIC_VECTOR (lpm_widthad-1 DOWNTO 0);

         wraddress : IN STD_LOGIC_VECTOR (lpm_widthad-1 DOWNTO 0));

   END COMPONENT;

   -- For Altera

   component LPM_RAM_DQ

      generic (

         LPM_WIDTH    : natural;    -- MUST be greater than 0

         LPM_WIDTHAD  : natural;    -- MUST be greater than 0

         LPM_NUMWORDS : natural := 0;

         LPM_INDATA   : string := "REGISTERED";

         LPM_ADDRESS_CONTROL: string := "REGISTERED";

         LPM_OUTDATA  : string := "REGISTERED";

         LPM_FILE     : string := "UNUSED";

         LPM_TYPE     : string := "LPM_RAM_DQ";

         USE_EAB      : string := "OFF";

         INTENDED_DEVICE_FAMILY  : string := "UNUSED";

         LPM_HINT     : string := "UNUSED");

                port (

         DATA     : in std_logic_vector(LPM_WIDTH-1 downto 0);

         ADDRESS  : in std_logic_vector(LPM_WIDTHAD-1 downto 0);

         INCLOCK  : in std_logic := '0';

         OUTCLOCK : in std_logic := '0';

         WE       : in std_logic;

         Q        : out std_logic_vector(LPM_WIDTH-1 downto 0));

   end component;

   -- For Xilinx

   component ramb4_s16_s16

      port (

         clka  : in std_logic;

         rsta  : in std_logic;

         addra : in std_logic_vector;

         dia   : in std_logic_vector;

         ena   : in std_logic;

         wea   : in std_logic;

         doa   : out std_logic_vector;

         clkb  : in std_logic;

         rstb  : in std_logic;

         addrb : in std_logic_vector;

         dib   : in std_logic_vector;

         enb   : in std_logic;

         web   : in std_logic);

   end component;

   component pc_next

      port(clk          : in std_logic;

           reset_in     : in std_logic;

           pc_new       : in std_logic_vector(31 downto 2);

           take_branch  : in std_logic;

           pause_in     : in std_logic;

           opcode25_0   : in std_logic_vector(25 downto 0);

           pc_source    : in pc_source_type;

           pc_out       : out std_logic_vector(31 downto 0);

           pc_out_plus4 : out std_logic_vector(31 downto 0));

   end component;

   component mem_ctrl

      generic(ACCURATE_TIMING : boolean := false);

      port(clk          : in std_logic;

           reset_in     : in std_logic;

           pause_in     : in std_logic;

           nullify_op   : in std_logic;

           address_pc   : in std_logic_vector(31 downto 0);

           opcode_out   : out std_logic_vector(31 downto 0);

           address_data : in std_logic_vector(31 downto 0);

           mem_source   : in mem_source_type;

           data_write   : in std_logic_vector(31 downto 0);

           data_read    : out std_logic_vector(31 downto 0);

           pause_out    : out std_logic;

           mem_address  : out std_logic_vector(31 downto 0);

           mem_data_w   : out std_logic_vector(31 downto 0);

           mem_data_r   : in std_logic_vector(31 downto 0);

           mem_byte_sel : out std_logic_vector(3 downto 0);

           mem_write    : out std_logic);

   end component;

   component control

      port(opcode       : in  std_logic_vector(31 downto 0);

           intr_signal  : in  std_logic;

           rs_index     : out std_logic_vector(5 downto 0);

           rt_index     : out std_logic_vector(5 downto 0);

           rd_index     : out std_logic_vector(5 downto 0);

           imm_out      : out std_logic_vector(15 downto 0);

           alu_func     : out alu_function_type;

           shift_func   : out shift_function_type;

           mult_func    : out mult_function_type;

           branch_func  : out branch_function_type;

           a_source_out : out a_source_type;

           b_source_out : out b_source_type;

           c_source_out : out c_source_type;

           pc_source_out: out pc_source_type;

           mem_source_out:out mem_source_type);

   end component;

   component reg_bank

      generic(memory_type : string := "TRI_PORT");

      port(clk            : in  std_logic;

           reset_in       : in  std_logic;

           pause          : in  std_logic;

           rs_index       : in  std_logic_vector(5 downto 0);

           rt_index       : in  std_logic_vector(5 downto 0);

           rd_index       : in  std_logic_vector(5 downto 0);

           reg_source_out : out std_logic_vector(31 downto 0);

           reg_target_out : out std_logic_vector(31 downto 0);

           reg_dest_new   : in  std_logic_vector(31 downto 0);

           intr_enable    : out std_logic);

   end component;

   component bus_mux

      port(imm_in       : in  std_logic_vector(15 downto 0);

           reg_source   : in  std_logic_vector(31 downto 0);

           a_mux        : in  a_source_type;

           a_out        : out std_logic_vector(31 downto 0);

           reg_target   : in  std_logic_vector(31 downto 0);

           b_mux        : in  b_source_type;

           b_out        : out std_logic_vector(31 downto 0);

           c_bus        : in  std_logic_vector(31 downto 0);

           c_memory     : in  std_logic_vector(31 downto 0);

           c_pc         : in  std_logic_vector(31 downto 0);

           c_pc_plus4   : in  std_logic_vector(31 downto 0);

           c_mux        : in  c_source_type;

           reg_dest_out : out std_logic_vector(31 downto 0);

           branch_func  : in  branch_function_type;

           take_branch  : out std_logic);

   end component;

   component alu

      generic(adder_type : string := "GENERIC");

      port(a_in         : in  std_logic_vector(31 downto 0);

           b_in         : in  std_logic_vector(31 downto 0);

           alu_function : in  alu_function_type;

           c_alu        : out std_logic_vector(31 downto 0));

   end component;

   component shifter

      port(value        : in  std_logic_vector(31 downto 0);

           shift_amount : in  std_logic_vector(4 downto 0);

           shift_func   : in  shift_function_type;

           c_shift      : out std_logic_vector(31 downto 0));

   end component;

   component mult

      generic(adder_type : string := "GENERIC");

      port(clk       : in std_logic;

           a, b      : in std_logic_vector(31 downto 0);

           mult_func : in mult_function_type;

           c_mult    : out std_logic_vector(31 downto 0);

           pause_out : out std_logic);

   end component;

   component pipeline

      port(clk            : in  std_logic;

           reset          : in  std_logic;

           a_bus          : in  std_logic_vector(31 downto 0);

           a_busD         : out std_logic_vector(31 downto 0);

           b_bus          : in  std_logic_vector(31 downto 0);

           b_busD         : out std_logic_vector(31 downto 0);

           alu_func       : in  alu_function_type;

           alu_funcD      : out alu_function_type;

           shift_func     : in  shift_function_type;

           shift_funcD    : out shift_function_type;

           mult_func      : in  mult_function_type;

           mult_funcD     : out mult_function_type;

           reg_dest       : in  std_logic_vector(31 downto 0);

           reg_destD      : out std_logic_vector(31 downto 0);

           rd_index       : in  std_logic_vector(5 downto 0);

           rd_indexD      : out std_logic_vector(5 downto 0);

           rs_index       : in  std_logic_vector(5 downto 0);

           rt_index       : in  std_logic_vector(5 downto 0);

           pc_source      : in  pc_source_type;

           mem_source     : in  mem_source_type;

           a_source       : in  a_source_type;

           b_source       : in  b_source_type;

           c_source       : in  c_source_type;

           c_bus          : in  std_logic_vector(31 downto 0);

           take_branch    : in  std_logic;

           take_branchD   : out std_logic;

           pause_any      : in  std_logic;

           pause_pipeline : out std_logic);

   end component;

   component mlite_cpu

      generic(memory_type     : string := "ALTERA";

              pipeline_stages : natural := 3);

      port(clk         : in std_logic;

           reset_in    : in std_logic;

           intr_in     : in std_logic;

           mem_address : out std_logic_vector(31 downto 0);

           mem_data_w  : out std_logic_vector(31 downto 0);

           mem_data_r  : in std_logic_vector(31 downto 0);

           mem_byte_sel: out std_logic_vector(3 downto 0);

           mem_write   : out std_logic;

           mem_pause   : in std_logic);

   end component;

   component ram

      generic(memory_type : string := "GENERIC");

      port(clk          : in std_logic;

           mem_byte_sel : in std_logic_vector(3 downto 0);

           mem_write    : in std_logic;

           mem_address  : in std_logic_vector(31 downto 0);

           mem_data_w   : in std_logic_vector(31 downto 0);

           mem_data_r   : out std_logic_vector(31 downto 0));

   end component; --ram

   component uart

      generic(log_file : string := "UNUSED");

      port(clk        : in std_logic;

           reset      : in std_logic;

           uart_sel   : in std_logic;

           data       : in std_logic_vector(7 downto 0);

           uart_read  : in std_logic;

           uart_write : out std_logic;

           pause      : out std_logic);

   end component; --uart

   component plasma

      generic(memory_type : string := "GENERIC";

              log_file    : string := "UNUSED");

      port(clk_in           : in std_logic;

           reset_in         : in std_logic;

           intr_in          : in std_logic;

           uart_read        : in std_logic;

           uart_write       : out std_logic;

           mem_address_out  : out std_logic_vector(31 downto 0);

           mem_data         : out std_logic_vector(31 downto 0);

           mem_byte_sel_out : out std_logic_vector(3 downto 0);

           mem_write_out    : out std_logic;

           mem_pause_in     : in std_logic);

   end component; --plasma

   component plasma_if

      generic(memory_type : string := "ALTERA";

              log_file    : string := "UNUSED");

      port(clk_in     : in std_logic;

           reset_n    : in std_logic;

           uart_read  : in std_logic;

           uart_write : out std_logic;

           address    : out std_logic_vector(31 downto 0);

           data       : out std_logic_vector(31 downto 0);

           we_n       : out std_logic;

           oe_n       : out std_logic;

           be_n       : out std_logic_vector(3 downto 0);

           sram0_cs_n : out std_logic;

           sram1_cs_n : out std_logic);

   end component; --plasma_if

end; --package mlite_pack

package body mlite_pack is

function bv_to_integer(bv: in std_logic_vector) return integer is

   variable result : integer;

   variable b      : integer;

begin

   result := 0;

   b := 0;

   for index in bv'range loop

      if bv(index) = '1' then

         b := 1;

      else

         b := 0;

      end if;

      result := result * 2 + b;

   end loop;

   return result;

end; --function bv_to_integer

function bv_adder(a     : in std_logic_vector(32 downto 0);

                  b     : in std_logic_vector(32 downto 0);

                  do_add: in std_logic) return std_logic_vector is

   variable carry_in : std_logic;

   variable bb       : std_logic_vector(32 downto 0);

   variable result   : std_logic_vector(32 downto 0);

begin

   result := '0' & ZERO;

   if do_add = '1' then

      bb := b;

      carry_in := '0';

   else

      bb := not b;

      carry_in := '1';

   end if;

   for index in 0 to 32 loop

      result(index) := a(index) xor bb(index) xor carry_in;

      carry_in := (carry_in and (a(index) or bb(index))) or

                  (a(index) and bb(index));

   end loop;

   return result;

end; --function

function bv_adder_lookahead(

                  a     : in std_logic_vector(32 downto 0);

                  b     : in std_logic_vector(32 downto 0);

                  do_add: in std_logic) return std_logic_vector is

   variable carry    : std_logic_vector(32 downto 0);

   variable p, g     : std_logic_vector(32 downto 0);

   variable bb       : std_logic_vector(32 downto 0);

   variable result   : std_logic_vector(32 downto 0);

   variable i        : natural;

begin

   carry := '0' & ZERO;

   if do_add = '1' then

      bb := b;

      carry(0) := '0';

   else

      bb := not b;

      carry(0) := '1';

   end if;

   p := a or bb;   --propogate

   g := a and bb;  --generate

   for index in 0 to 7 loop

      i := index*4;

      carry(i+1) := g(i) or

                    (p(i) and carry(i));

      i := index*4+1;

      carry(i+1) := g(i) or

                    (p(i) and g(i-1)) or

                    ((p(i) and p(i-1)) and carry(i-1));

      i := index*4+2;

      carry(i+1) := g(i) or

                    (p(i) and g(i-1)) or

                    (p(i) and p(i-1) and g(i-2)) or

                    ((p(i) and p(i-1) and p(i-2)) and carry(i-2));

      i := index*4+3;

      carry(i+1) := g(i) or

                    (p(i) and g(i-1)) or

                    (p(i) and p(i-1) and g(i-2)) or

                    (p(i) and p(i-1) and p(i-2) and g(i-3)) or

                    (((p(i) and p(i-1)) and (p(i-2) and p(i-3)))

                       and carry(i-3));

   end loop;

   result := (a xor bb) xor carry;

   return result;

end; --function

function bv_negate(a : in std_logic_vector) return std_logic_vector is

   variable carry_in : std_logic;

   variable not_a    : std_logic_vector(31 downto 0);

   variable result   : std_logic_vector(31 downto 0);

begin

   result := ZERO;

   not_a := not a;

   carry_in := '1';

   for index in a'reverse_range loop

      result(index) := not_a(index) xor carry_in;

      carry_in := carry_in and not_a(index);

   end loop;

   return result;

end; --function

function bv_increment(a : in std_logic_vector(31 downto 2)

                     ) return std_logic_vector is

   variable carry_in : std_logic;

   variable result   : std_logic_vector(31 downto 2);

begin

   result := ZERO(31 downto 2);

   carry_in := '1';

   for index in 2 to 31 loop

      result(index) := a(index) xor carry_in;

      carry_in := a(index) and carry_in;

   end loop;

   return result;

end; --function

function bv_inc6(a : in std_logic_vector

                     ) return std_logic_vector is

   variable carry_in : std_logic;

   variable result   : std_logic_vector(5 downto 0);

begin

   result := "000000";

   carry_in := '1';

   for index in 0 to 5 loop

      result(index) := a(index) xor carry_in;

      carry_in := a(index) and carry_in;

   end loop;