library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; library work; use work.decode_types.all; use work.common.all; use work.helpers.all; use work.crhelpers.all; use work.insn_helpers.all; use work.ppc_fx_insns.all; entity execute1 is port ( clk : in std_logic; -- asynchronous flush_out : out std_ulogic; e_in : in Decode2ToExecute1Type; -- asynchronous f_out : out Execute1ToFetch1Type; e_out : out Execute1ToWritebackType; icache_inval : out std_ulogic; terminate_out : out std_ulogic ); end entity execute1; architecture behaviour of execute1 is type reg_type is record --f : Execute1ToFetch1Type; e : Execute1ToWritebackType; end record; signal r, rin : reg_type; signal ctrl: ctrl_t := (carry => '0', others => (others => '0')); signal ctrl_tmp: ctrl_t := (carry => '0', others => (others => '0')); signal right_shift, rot_clear_left, rot_clear_right: std_ulogic; signal rotator_result: std_ulogic_vector(63 downto 0); signal rotator_carry: std_ulogic; signal logical_result: std_ulogic_vector(63 downto 0); signal countzero_result: std_ulogic_vector(63 downto 0); function decode_input_carry (carry_sel : carry_in_t; ca_in : std_ulogic) return std_ulogic is begin case carry_sel is when ZERO => return '0'; when CA => return ca_in; when ONE => return '1'; end case; end; begin rotator_0: entity work.rotator port map ( rs => e_in.read_data3, ra => e_in.read_data1, shift => e_in.read_data2(6 downto 0), insn => e_in.insn, is_32bit => e_in.is_32bit, right_shift => right_shift, arith => e_in.is_signed, clear_left => rot_clear_left, clear_right => rot_clear_right, result => rotator_result, carry_out => rotator_carry ); logical_0: entity work.logical port map ( rs => e_in.read_data3, rb => e_in.read_data2, op => e_in.insn_type, invert_in => e_in.invert_a, invert_out => e_in.invert_out, result => logical_result ); countzero_0: entity work.zero_counter port map ( rs => e_in.read_data3, count_right => e_in.insn(10), is_32bit => e_in.is_32bit, result => countzero_result ); execute1_0: process(clk) begin if rising_edge(clk) then r <= rin; ctrl <= ctrl_tmp; end if; end process; execute1_1: process(all) variable v : reg_type; variable a_inv : std_ulogic_vector(63 downto 0); variable result : std_ulogic_vector(63 downto 0); variable newcrf : std_ulogic_vector(3 downto 0); variable result_with_carry : std_ulogic_vector(64 downto 0); variable result_en : std_ulogic; variable crnum : crnum_t; variable crbit : integer range 0 to 31; variable scrnum : crnum_t; variable lo, hi : integer; variable sh, mb, me : std_ulogic_vector(5 downto 0); variable sh32, mb32, me32 : std_ulogic_vector(4 downto 0); variable bo, bi : std_ulogic_vector(4 downto 0); variable bf, bfa : std_ulogic_vector(2 downto 0); variable l : std_ulogic; variable next_nia : std_ulogic_vector(63 downto 0); begin result := (others => '0'); result_with_carry := (others => '0'); result_en := '0'; newcrf := (others => '0'); v := r; v.e := Execute1ToWritebackInit; --v.f := Execute1ToFetch1TypeInit; ctrl_tmp <= ctrl; -- FIXME: run at 512MHz not core freq ctrl_tmp.tb <= std_ulogic_vector(unsigned(ctrl.tb) + 1); terminate_out <= '0'; icache_inval <= '0'; f_out <= Execute1ToFetch1TypeInit; -- Next insn adder used in a couple of places next_nia := std_ulogic_vector(unsigned(e_in.nia) + 4); -- rotator control signals right_shift <= '1' when e_in.insn_type = OP_SHR else '0'; rot_clear_left <= '1' when e_in.insn_type = OP_RLC or e_in.insn_type = OP_RLCL else '0'; rot_clear_right <= '1' when e_in.insn_type = OP_RLC or e_in.insn_type = OP_RLCR else '0'; if e_in.valid = '1' then v.e.valid := '1'; v.e.write_reg := e_in.write_reg; v.e.write_len := x"8"; v.e.sign_extend := '0'; case_0: case e_in.insn_type is when OP_ILLEGAL => terminate_out <= '1'; report "illegal"; when OP_NOP => -- Do nothing when OP_ADD => if e_in.invert_a = '0' then a_inv := e_in.read_data1; else a_inv := not e_in.read_data1; end if; result_with_carry := ppc_adde(a_inv, e_in.read_data2, decode_input_carry(e_in.input_carry, ctrl.carry)); result := result_with_carry(63 downto 0); if e_in.output_carry then ctrl_tmp.carry <= result_with_carry(64); end if; result_en := '1'; when OP_AND | OP_OR | OP_XOR => result := logical_result; result_en := '1'; when OP_B => f_out.redirect <= '1'; if (insn_aa(e_in.insn)) then f_out.redirect_nia <= std_ulogic_vector(signed(e_in.read_data2)); else f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(e_in.read_data2)); end if; when OP_BC => bo := insn_bo(e_in.insn); bi := insn_bi(e_in.insn); if bo(4-2) = '0' then ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1); end if; if ppc_bc_taken(bo, bi, e_in.cr, ctrl.ctr) = 1 then f_out.redirect <= '1'; if (insn_aa(e_in.insn)) then f_out.redirect_nia <= std_ulogic_vector(signed(e_in.read_data2)); else f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(e_in.read_data2)); end if; end if; when OP_BCREG => -- bits 10 and 6 distinguish between bclr, bcctr and bctar bo := insn_bo(e_in.insn); bi := insn_bi(e_in.insn); if bo(4-2) = '0' and e_in.insn(10) = '0' then ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1); end if; if ppc_bc_taken(bo, bi, e_in.cr, ctrl.ctr) = 1 then f_out.redirect <= '1'; if e_in.insn(10) = '0' then f_out.redirect_nia <= ctrl.lr(63 downto 2) & "00"; else f_out.redirect_nia <= ctrl.ctr(63 downto 2) & "00"; end if; end if; when OP_CMPB => result := ppc_cmpb(e_in.read_data3, e_in.read_data2); result_en := '1'; when OP_CMP => bf := insn_bf(e_in.insn); l := insn_l(e_in.insn); v.e.write_cr_enable := '1'; crnum := to_integer(unsigned(bf)); v.e.write_cr_mask := num_to_fxm(crnum); for i in 0 to 7 loop lo := i*4; hi := lo + 3; v.e.write_cr_data(hi downto lo) := ppc_cmp(l, e_in.read_data1, e_in.read_data2); end loop; when OP_CMPL => bf := insn_bf(e_in.insn); l := insn_l(e_in.insn); v.e.write_cr_enable := '1'; crnum := to_integer(unsigned(bf)); v.e.write_cr_mask := num_to_fxm(crnum); for i in 0 to 7 loop lo := i*4; hi := lo + 3; v.e.write_cr_data(hi downto lo) := ppc_cmpl(l, e_in.read_data1, e_in.read_data2); end loop; when OP_CNTZ => result := countzero_result; result_en := '1'; when OP_EXTS => v.e.write_len := e_in.data_len; v.e.sign_extend := '1'; result := e_in.read_data3; result_en := '1'; when OP_ISEL => crbit := to_integer(unsigned(insn_bc(e_in.insn))); if e_in.cr(31-crbit) = '1' then result := e_in.read_data1; else result := e_in.read_data2; end if; result_en := '1'; when OP_MCRF => bf := insn_bf(e_in.insn); bfa := insn_bfa(e_in.insn); v.e.write_cr_enable := '1'; crnum := to_integer(unsigned(bf)); scrnum := to_integer(unsigned(bfa)); v.e.write_cr_mask := num_to_fxm(crnum); for i in 0 to 7 loop lo := (7-i)*4; hi := lo + 3; if i = scrnum then newcrf := e_in.cr(hi downto lo); end if; end loop; for i in 0 to 7 loop lo := i*4; hi := lo + 3; v.e.write_cr_data(hi downto lo) := newcrf; end loop; when OP_MFSPR => case decode_spr_num(e_in.insn) is when SPR_CTR => result := ctrl.ctr; when SPR_LR => result := ctrl.lr; when SPR_TB => result := ctrl.tb; when others => result := (others => '0'); end case; result_en := '1'; when OP_MFCR => if e_in.insn(20) = '0' then -- mfcr result := x"00000000" & e_in.cr; else -- mfocrf crnum := fxm_to_num(insn_fxm(e_in.insn)); result := (others => '0'); for i in 0 to 7 loop lo := (7-i)*4; hi := lo + 3; if crnum = i then result(hi downto lo) := e_in.cr(hi downto lo); end if; end loop; end if; result_en := '1'; when OP_MTCRF => v.e.write_cr_enable := '1'; if e_in.insn(20) = '0' then -- mtcrf v.e.write_cr_mask := insn_fxm(e_in.insn); else -- mtocrf: We require one hot priority encoding here crnum := fxm_to_num(insn_fxm(e_in.insn)); v.e.write_cr_mask := num_to_fxm(crnum); end if; v.e.write_cr_data := e_in.read_data3(31 downto 0); when OP_MTSPR => case decode_spr_num(e_in.insn) is when SPR_CTR => ctrl_tmp.ctr <= e_in.read_data3; when SPR_LR => ctrl_tmp.lr <= e_in.read_data3; when others => end case; when OP_POPCNTB => result := ppc_popcntb(e_in.read_data3); result_en := '1'; when OP_POPCNTW => result := ppc_popcntw(e_in.read_data3); result_en := '1'; when OP_POPCNTD => result := ppc_popcntd(e_in.read_data3); result_en := '1'; when OP_PRTYD => result := ppc_prtyd(e_in.read_data3); result_en := '1'; when OP_PRTYW => result := ppc_prtyw(e_in.read_data3); result_en := '1'; when OP_RLC | OP_RLCL | OP_RLCR | OP_SHL | OP_SHR => result := rotator_result; if e_in.output_carry = '1' then ctrl_tmp.carry <= rotator_carry; end if; result_en := '1'; when OP_SIM_CONFIG => -- bit 0 was used to select the microwatt console, which -- we no longer support. result := x"0000000000000000"; result_en := '1'; when OP_TDI => -- Keep our test cases happy for now, ignore trap instructions report "OP_TDI FIXME"; when OP_ISYNC => f_out.redirect <= '1'; f_out.redirect_nia <= next_nia; when OP_ICBI => icache_inval <= '1'; when others => terminate_out <= '1'; report "illegal"; end case; if e_in.lr = '1' then ctrl_tmp.lr <= next_nia; end if; end if; v.e.write_data := result; v.e.write_enable := result_en; v.e.rc := e_in.rc; -- Update registers rin <= v; -- update outputs --f_out <= r.f; e_out <= r.e; flush_out <= f_out.redirect; end process; end architecture behaviour;