You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
microwatt/execute1.vhdl

374 lines
11 KiB
VHDL

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