antonblanchard.microwatt/common.vhdl

library ieee;
use ieee.std_logic_1164.all;

library work;
use work.decode_types.all;

package common is
	type ctrl_t is record
		lr: std_ulogic_vector(63 downto 0);
		ctr: std_ulogic_vector(63 downto 0);
		tb: std_ulogic_vector(63 downto 0);
		carry: std_ulogic;
	end record;

	type Fetch1ToFetch2Type is record
		valid: std_ulogic;
		nia: std_ulogic_vector(63 downto 0);
	end record;

	type Fetch2ToDecode1Type is record
		valid: std_ulogic;
		nia: std_ulogic_vector(63 downto 0);
		insn: std_ulogic_vector(31 downto 0);
	end record;
	constant Fetch2ToDecode1Init : Fetch2ToDecode1Type := (valid => '0', others => (others => '0'));

	type Decode1ToDecode2Type is record
		valid: std_ulogic;
		nia: std_ulogic_vector(63 downto 0);
		insn: std_ulogic_vector(31 downto 0);
		decode: decode_rom_t;
	end record;
	constant Decode1ToDecode2Init : Decode1ToDecode2Type := (valid => '0', decode => decode_rom_init, others => (others => '0'));

	type Decode2ToExecute1Type is record
		valid: std_ulogic;
		insn_type: insn_type_t;
		nia: std_ulogic_vector(63 downto 0);
		write_reg: std_ulogic_vector(4 downto 0);
		read_reg1: std_ulogic_vector(4 downto 0);
		read_reg2: std_ulogic_vector(4 downto 0);
		read_data1: std_ulogic_vector(63 downto 0);
		read_data2: std_ulogic_vector(63 downto 0);
		const1: std_ulogic_vector(7 downto 0);
		const2: std_ulogic_vector(5 downto 0);
		const3: std_ulogic_vector(4 downto 0);
		cr: std_ulogic_vector(31 downto 0);
		lr: std_ulogic;
		rc: std_ulogic;
		input_carry: std_ulogic;
		output_carry: std_ulogic;
		input_cr: std_ulogic;
		output_cr: std_ulogic;
	end record;
	constant Decode2ToExecute1Init : Decode2ToExecute1Type := (valid => '0', insn_type => OP_ILLEGAL, lr => '0', rc => '0', input_carry => '0', output_carry => '0', input_cr => '0', output_cr => '0', others => (others => '0'));

	type Decode2ToMultiplyType is record
		valid: std_ulogic;
		insn_type: insn_type_t;
		nia: std_ulogic_vector(63 downto 0);
		write_reg: std_ulogic_vector(4 downto 0);
		data1: std_ulogic_vector(64 downto 0);
		data2: std_ulogic_vector(64 downto 0);
		rc: std_ulogic;
	end record;
	constant Decode2ToMultiplyInit : Decode2ToMultiplyType := (valid => '0', insn_type => OP_ILLEGAL, rc => '0', others => (others => '0'));

	type Decode2ToRegisterFileType is record
		read1_enable : std_ulogic;
		read1_reg : std_ulogic_vector(4 downto 0);
		read2_enable : std_ulogic;
		read2_reg : std_ulogic_vector(4 downto 0);
		read3_enable : std_ulogic;
		read3_reg : std_ulogic_vector(4 downto 0);
	end record;

	type RegisterFileToDecode2Type is record
		read1_data : std_ulogic_vector(63 downto 0);
		read2_data : std_ulogic_vector(63 downto 0);
		read3_data : std_ulogic_vector(63 downto 0);
	end record;

	type Decode2ToCrFileType is record
		read : std_ulogic;
	end record;

	type CrFileToDecode2Type is record
		read_cr_data   : std_ulogic_vector(31 downto 0);
	end record;

	type Execute1ToFetch1Type is record
		redirect: std_ulogic;
		redirect_nia: std_ulogic_vector(63 downto 0);
	end record;
	constant Execute1ToFetch1TypeInit : Execute1ToFetch1Type := (redirect => '0', others => (others => '0'));

	type Decode2ToLoadstore1Type is record
		valid : std_ulogic;
		nia: std_ulogic_vector(63 downto 0);
		load : std_ulogic;				-- is this a load or store
		addr1 : std_ulogic_vector(63 downto 0);
		addr2 : std_ulogic_vector(63 downto 0);
		data : std_ulogic_vector(63 downto 0);		-- data to write, unused for read
		write_reg : std_ulogic_vector(4 downto 0);	-- read data goes to this register
		length : std_ulogic_vector(3 downto 0);
		byte_reverse : std_ulogic;
		sign_extend : std_ulogic;			-- do we need to sign extend?
		update : std_ulogic;				-- is this an update instruction?
		update_reg : std_ulogic_vector(4 downto 0);	-- if so, the register to update
	end record;
	constant Decode2ToLoadstore1Init : Decode2ToLoadstore1Type := (valid => '0', load => '0', byte_reverse => '0', sign_extend => '0', update => '0', others => (others => '0'));

	type Loadstore1ToLoadstore2Type is record
		valid : std_ulogic;
		load : std_ulogic;
		addr : std_ulogic_vector(63 downto 0);
		data : std_ulogic_vector(63 downto 0);
		write_reg : std_ulogic_vector(4 downto 0);
		length : std_ulogic_vector(3 downto 0);
		byte_reverse : std_ulogic;
		sign_extend : std_ulogic;
		update : std_ulogic;
		update_reg : std_ulogic_vector(4 downto 0);
	end record;

	type Loadstore2ToWritebackType is record
		valid : std_ulogic;
		write_enable: std_ulogic;
		write_reg : std_ulogic_vector(4 downto 0);
		write_data : std_ulogic_vector(63 downto 0);
	end record;
	constant Loadstore2ToWritebackInit : Loadstore2ToWritebackType := (valid => '0', write_enable => '0', others => (others => '0'));

	type Execute1ToExecute2Type is record
		valid: std_ulogic;
		write_enable : std_ulogic;
		write_reg: std_ulogic_vector(4 downto 0);
		write_data: std_ulogic_vector(63 downto 0);
		write_cr_enable : std_ulogic;
		write_cr_mask : std_ulogic_vector(7 downto 0);
		write_cr_data : std_ulogic_vector(31 downto 0);
		rc : std_ulogic;
	end record;
	constant Execute1ToExecute2Init : Execute1ToExecute2Type := (valid => '0', write_enable => '0', write_cr_enable => '0', rc => '0', others => (others => '0'));

	type Execute2ToWritebackType is record
		valid: std_ulogic;
		write_enable : std_ulogic;
		write_reg: std_ulogic_vector(4 downto 0);
		write_data: std_ulogic_vector(63 downto 0);
		write_cr_enable : std_ulogic;
		write_cr_mask : std_ulogic_vector(7 downto 0);
		write_cr_data : std_ulogic_vector(31 downto 0);
	end record;
	constant Execute2ToWritebackInit : Execute2ToWritebackType := (valid => '0', write_enable => '0', write_cr_enable => '0', others => (others => '0'));

	type MultiplyToWritebackType is record
		valid: std_ulogic;

		write_reg_enable : std_ulogic;
		write_reg_nr: std_ulogic_vector(4 downto 0);
		write_reg_data: std_ulogic_vector(63 downto 0);
		write_cr_enable: std_ulogic;
		write_cr_mask: std_ulogic_vector(7 downto 0);
		write_cr_data: std_ulogic_vector(31 downto 0);
	end record;
	constant MultiplyToWritebackInit : MultiplyToWritebackType := (valid => '0', write_reg_enable => '0', write_cr_enable => '0', others => (others => '0'));

	type WritebackToRegisterFileType is record
		write_reg : std_ulogic_vector(4 downto 0);
		write_data : std_ulogic_vector(63 downto 0);
		write_enable : std_ulogic;
		write_reg2 : std_ulogic_vector(4 downto 0);
		write_data2 : std_ulogic_vector(63 downto 0);
		write_enable2 : std_ulogic;
	end record;
	constant WritebackToRegisterFileInit : WritebackToRegisterFileType := (write_enable => '0', write_enable2 => '0', others => (others => '0'));

	type WritebackToCrFileType is record
		write_cr_enable : std_ulogic;
		write_cr_mask : std_ulogic_vector(7 downto 0);
		write_cr_data : std_ulogic_vector(31 downto 0);
	end record;
	constant WritebackToCrFileInit : WritebackToCrFileType := (write_cr_enable => '0', others => (others => '0'));

	-- Would prefer not to expose this outside the register file, but ghdl
	-- doesn't support external names
	type regfile is array(0 to 32) of std_ulogic_vector(63 downto 0);
end common;

package body common is
end common;