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374 lines
11 KiB
VHDL
374 lines
11 KiB
VHDL
library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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library work;
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use work.decode_types.all;
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use work.common.all;
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use work.helpers.all;
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use work.crhelpers.all;
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use work.ppc_fx_insns.all;
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use work.sim_console.all;
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entity execute1 is
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generic (
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SIM : boolean := false
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);
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port (
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clk : in std_logic;
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e_in : in Decode2ToExecute1Type;
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f_out : out Execute1ToFetch1Type;
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e_out : out Execute1ToExecute2Type;
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terminate_out : out std_ulogic
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);
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end entity execute1;
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architecture behaviour of execute1 is
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signal e: Decode2ToExecute1Type := Decode2ToExecute1Init;
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signal ctrl: ctrl_t := (carry => '0', others => (others => '0'));
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signal ctrl_tmp: ctrl_t := (carry => '0', others => (others => '0'));
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begin
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execute1_0: process(clk)
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begin
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if rising_edge(clk) then
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e <= e_in;
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ctrl <= ctrl_tmp;
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end if;
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end process;
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execute1_1: process(all)
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variable result : std_ulogic_vector(63 downto 0);
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variable result_with_carry : std_ulogic_vector(64 downto 0);
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variable result_en : integer;
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variable crnum : integer;
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begin
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result := (others => '0');
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result_with_carry := (others => '0');
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result_en := 0;
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e_out <= Execute1ToExecute2Init;
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f_out <= Execute1ToFetch1TypeInit;
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ctrl_tmp <= ctrl;
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-- FIXME: run at 512MHz not core freq
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ctrl_tmp.tb <= std_ulogic_vector(unsigned(ctrl.tb) + 1);
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terminate_out <= '0';
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if e.valid = '1' then
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e_out.valid <= '1';
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e_out.write_reg <= e.write_reg;
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report "execute " & to_hstring(e.nia);
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case_0: case e.insn_type is
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when OP_ILLEGAL =>
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terminate_out <= '1';
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report "illegal";
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when OP_NOP =>
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-- Do nothing
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when OP_ADD =>
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result := ppc_add(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_ADDC =>
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result_with_carry := ppc_adde(e.read_data1, e.read_data2, ctrl.carry and e.input_carry);
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64) and e.output_carry;
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result_en := 1;
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when OP_AND =>
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result := ppc_and(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_ANDC =>
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result := ppc_andc(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_B =>
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f_out.redirect <= '1';
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f_out.redirect_nia <= std_ulogic_vector(signed(e.nia) + signed(e.read_data2));
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when OP_BC =>
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if e.const1(4-2) = '0' then
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ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1);
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end if;
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if ppc_bc_taken(e.const1(4 downto 0), e.const2(4 downto 0), e.cr, ctrl.ctr) = 1 then
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f_out.redirect <= '1';
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f_out.redirect_nia <= std_ulogic_vector(signed(e.nia) + signed(e.read_data2));
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end if;
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when OP_BCLR =>
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if e.const1(4-2) = '0' then
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ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1);
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end if;
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if ppc_bc_taken(e.const1(4 downto 0), e.const2(4 downto 0), e.cr, ctrl.ctr) = 1 then
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f_out.redirect <= '1';
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f_out.redirect_nia <= ctrl.lr(63 downto 2) & "00";
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end if;
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when OP_BCCTR =>
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if ppc_bcctr_taken(e.const1(4 downto 0), e.const2(4 downto 0), e.cr) = 1 then
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f_out.redirect <= '1';
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f_out.redirect_nia <= ctrl.ctr(63 downto 2) & "00";
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end if;
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when OP_CMPB =>
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result := ppc_cmpb(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_CMP =>
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e_out.write_cr_enable <= '1';
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crnum := to_integer(unsigned(e.const1(2 downto 0)));
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e_out.write_cr_mask <= num_to_fxm(crnum);
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e_out.write_cr_data <= (others => '0');
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e_out.write_cr_data((4*(7-crnum)+3) downto (4*(7-crnum))) <= ppc_cmp(e.const2(0), e.read_data1, e.read_data2);
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when OP_CMPL =>
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e_out.write_cr_enable <= '1';
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crnum := to_integer(unsigned(e.const1(2 downto 0)));
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e_out.write_cr_mask <= num_to_fxm(crnum);
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e_out.write_cr_data <= (others => '0');
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e_out.write_cr_data((4*(7-crnum)+3) downto (4*(7-crnum))) <= ppc_cmpl(e.const2(0), e.read_data1, e.read_data2);
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when OP_CNTLZW =>
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result := ppc_cntlzw(e.read_data1);
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result_en := 1;
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when OP_CNTTZW =>
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result := ppc_cnttzw(e.read_data1);
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result_en := 1;
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when OP_CNTLZD =>
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result := ppc_cntlzd(e.read_data1);
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result_en := 1;
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when OP_CNTTZD =>
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result := ppc_cnttzd(e.read_data1);
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result_en := 1;
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when OP_EXTSB =>
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result := ppc_extsb(e.read_data1);
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result_en := 1;
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when OP_EXTSH =>
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result := ppc_extsh(e.read_data1);
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result_en := 1;
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when OP_EXTSW =>
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result := ppc_extsw(e.read_data1);
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result_en := 1;
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when OP_EQV =>
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result := ppc_eqv(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_ISEL =>
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crnum := to_integer(unsigned(e.const1));
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if e.cr(31-crnum) = '1' then
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result := e.read_data1;
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else
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result := e.read_data2;
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end if;
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result_en := 1;
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when OP_MFCTR =>
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result := ctrl.ctr;
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result_en := 1;
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when OP_MFLR =>
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result := ctrl.lr;
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result_en := 1;
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when OP_MFTB =>
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result := ctrl.tb;
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result_en := 1;
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when OP_MTCTR =>
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ctrl_tmp.ctr <= e.read_data1;
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when OP_MTLR =>
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ctrl_tmp.lr <= e.read_data1;
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when OP_MFCR =>
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result := x"00000000" & e.cr;
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result_en := 1;
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when OP_MFOCRF =>
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crnum := fxm_to_num(e.const1(7 downto 0));
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result := (others => '0');
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result((4*(7-crnum)+3) downto (4*(7-crnum))) := e.cr((4*(7-crnum)+3) downto (4*(7-crnum)));
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result_en := 1;
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when OP_MTCRF =>
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e_out.write_cr_enable <= '1';
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e_out.write_cr_mask <= e.const1(7 downto 0);
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e_out.write_cr_data <= e.read_data1(31 downto 0);
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when OP_MTOCRF =>
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e_out.write_cr_enable <= '1';
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-- We require one hot priority encoding here
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crnum := fxm_to_num(e.const1(7 downto 0));
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e_out.write_cr_mask <= num_to_fxm(crnum);
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e_out.write_cr_data <= e.read_data1(31 downto 0);
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when OP_NAND =>
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result := ppc_nand(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_NEG =>
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result := ppc_neg(e.read_data1);
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result_en := 1;
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when OP_NOR =>
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result := ppc_nor(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_OR =>
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result := ppc_or(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_ORC =>
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result := ppc_orc(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_POPCNTB =>
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result := ppc_popcntb(e.read_data1);
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result_en := 1;
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when OP_POPCNTW =>
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result := ppc_popcntw(e.read_data1);
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result_en := 1;
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when OP_POPCNTD =>
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result := ppc_popcntd(e.read_data1);
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result_en := 1;
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when OP_PRTYD =>
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result := ppc_prtyd(e.read_data1);
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result_en := 1;
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when OP_PRTYW =>
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result := ppc_prtyw(e.read_data1);
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result_en := 1;
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when OP_RLDCL =>
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result := ppc_rldcl(e.read_data1, e.read_data2, e.const2(5 downto 0));
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result_en := 1;
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when OP_RLDCR =>
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result := ppc_rldcr(e.read_data1, e.read_data2, e.const2(5 downto 0));
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result_en := 1;
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when OP_RLDICL =>
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result := ppc_rldicl(e.read_data1, e.const1(5 downto 0), e.const2(5 downto 0));
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result_en := 1;
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when OP_RLDICR =>
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result := ppc_rldicr(e.read_data1, e.const1(5 downto 0), e.const2(5 downto 0));
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result_en := 1;
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when OP_RLWNM =>
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result := ppc_rlwnm(e.read_data1, e.read_data2, e.const2(4 downto 0), e.const3(4 downto 0));
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result_en := 1;
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when OP_RLWINM =>
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result := ppc_rlwinm(e.read_data1, e.const1(4 downto 0), e.const2(4 downto 0), e.const3(4 downto 0));
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result_en := 1;
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when OP_RLDIC =>
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result := ppc_rldic(e.read_data1, e.const1(5 downto 0), e.const2(5 downto 0));
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result_en := 1;
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when OP_RLDIMI =>
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result := ppc_rldimi(e.read_data1, e.read_data2, e.const1(5 downto 0), e.const2(5 downto 0));
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result_en := 1;
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when OP_RLWIMI =>
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result := ppc_rlwimi(e.read_data1, e.read_data2, e.const1(4 downto 0), e.const2(4 downto 0), e.const3(4 downto 0));
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result_en := 1;
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when OP_SLD =>
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result := ppc_sld(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_SLW =>
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result := ppc_slw(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_SRAW =>
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result_with_carry := ppc_sraw(e.read_data1, e.read_data2);
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64);
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result_en := 1;
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when OP_SRAWI =>
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result_with_carry := ppc_srawi(e.read_data1, e.const1(5 downto 0));
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64);
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result_en := 1;
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when OP_SRAD =>
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result_with_carry := ppc_srad(e.read_data1, e.read_data2);
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64);
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result_en := 1;
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when OP_SRADI =>
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result_with_carry := ppc_sradi(e.read_data1, e.const1(5 downto 0));
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64);
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result_en := 1;
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when OP_SRD =>
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result := ppc_srd(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_SRW =>
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result := ppc_srw(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_SUBF =>
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result := ppc_subf(e.read_data1, e.read_data2);
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result_en := 1;
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when OP_SUBFC =>
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result_with_carry := ppc_subfe(e.read_data1, e.read_data2, ctrl.carry or not(e.input_carry));
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result := result_with_carry(63 downto 0);
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ctrl_tmp.carry <= result_with_carry(64) and e.output_carry;
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result_en := 1;
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when OP_XOR =>
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result := ppc_xor(e.read_data1, e.read_data2);
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result_en := 1;
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-- sim console
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when OP_SIM_READ =>
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if SIM = true then
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sim_console_read(result);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_SIM_POLL =>
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if SIM = true then
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sim_console_poll(result);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_SIM_WRITE =>
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if SIM = true then
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sim_console_write(e.read_data1);
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_SIM_CONFIG =>
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if SIM = true then
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result := x"0000000000000001";
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else
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result := x"0000000000000000";
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end if;
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result_en := 1;
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when OP_TDI =>
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-- Keep our test cases happy for now, ignore trap instructions
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report "OP_TDI FIXME";
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when OP_DIVDU =>
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if SIM = true then
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result := ppc_divdu(e.read_data1, e.read_data2);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_DIVD =>
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if SIM = true then
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result := ppc_divd(e.read_data1, e.read_data2);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_DIVWU =>
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if SIM = true then
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result := ppc_divwu(e.read_data1, e.read_data2);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when OP_DIVW =>
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if SIM = true then
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result := ppc_divw(e.read_data1, e.read_data2);
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result_en := 1;
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else
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terminate_out <= '1';
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report "illegal";
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end if;
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when others =>
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terminate_out <= '1';
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report "illegal";
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end case;
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if e.lr = '1' then
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ctrl_tmp.lr <= std_ulogic_vector(unsigned(e.nia) + 4);
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end if;
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if result_en = 1 then
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e_out.write_data <= result;
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e_out.write_enable <= '1';
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e_out.rc <= e.rc;
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end if;
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end if;
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end process;
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end architecture behaviour;
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