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.
392 lines
12 KiB
VHDL
392 lines
12 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;
|
|
|
|
-- asynchronous
|
|
flush_out : out std_ulogic;
|
|
|
|
e_in : in Decode2ToExecute1Type;
|
|
|
|
-- asynchronous
|
|
f_out : out Execute1ToFetch1Type;
|
|
|
|
e_out : out Execute1ToExecute2Type;
|
|
|
|
terminate_out : out std_ulogic
|
|
);
|
|
end entity execute1;
|
|
|
|
architecture behaviour of execute1 is
|
|
type reg_type is record
|
|
--f : Execute1ToFetch1Type;
|
|
e : Execute1ToExecute2Type;
|
|
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'));
|
|
begin
|
|
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 result : std_ulogic_vector(63 downto 0);
|
|
variable result_with_carry : std_ulogic_vector(64 downto 0);
|
|
variable result_en : integer;
|
|
variable crnum : integer;
|
|
variable lo, hi : integer;
|
|
begin
|
|
result := (others => '0');
|
|
result_with_carry := (others => '0');
|
|
result_en := 0;
|
|
|
|
v := r;
|
|
v.e := Execute1ToExecute2Init;
|
|
--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';
|
|
flush_out <= '0';
|
|
f_out <= Execute1ToFetch1TypeInit;
|
|
|
|
if e_in.valid = '1' then
|
|
|
|
v.e.valid := '1';
|
|
v.e.write_reg := e_in.write_reg;
|
|
|
|
case_0: case e_in.insn_type is
|
|
|
|
when OP_ILLEGAL =>
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
when OP_NOP =>
|
|
-- Do nothing
|
|
when OP_ADD =>
|
|
result := ppc_add(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_ADDC =>
|
|
result_with_carry := ppc_adde(e_in.read_data1, e_in.read_data2, ctrl.carry and e_in.input_carry);
|
|
result := result_with_carry(63 downto 0);
|
|
ctrl_tmp.carry <= result_with_carry(64) and e_in.output_carry;
|
|
result_en := 1;
|
|
when OP_AND =>
|
|
result := ppc_and(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_ANDC =>
|
|
result := ppc_andc(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_B =>
|
|
flush_out <= '1';
|
|
f_out.redirect <= '1';
|
|
f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(e_in.read_data2));
|
|
when OP_BC =>
|
|
if e_in.const1(4-2) = '0' then
|
|
ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1);
|
|
end if;
|
|
if ppc_bc_taken(e_in.const1(4 downto 0), e_in.const2(4 downto 0), e_in.cr, ctrl.ctr) = 1 then
|
|
flush_out <= '1';
|
|
f_out.redirect <= '1';
|
|
f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(e_in.read_data2));
|
|
end if;
|
|
when OP_BCLR =>
|
|
if e_in.const1(4-2) = '0' then
|
|
ctrl_tmp.ctr <= std_ulogic_vector(unsigned(ctrl.ctr) - 1);
|
|
end if;
|
|
if ppc_bc_taken(e_in.const1(4 downto 0), e_in.const2(4 downto 0), e_in.cr, ctrl.ctr) = 1 then
|
|
flush_out <= '1';
|
|
f_out.redirect <= '1';
|
|
f_out.redirect_nia <= ctrl.lr(63 downto 2) & "00";
|
|
end if;
|
|
when OP_BCCTR =>
|
|
if ppc_bcctr_taken(e_in.const1(4 downto 0), e_in.const2(4 downto 0), e_in.cr) = 1 then
|
|
flush_out <= '1';
|
|
f_out.redirect <= '1';
|
|
f_out.redirect_nia <= ctrl.ctr(63 downto 2) & "00";
|
|
end if;
|
|
when OP_CMPB =>
|
|
result := ppc_cmpb(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_CMP =>
|
|
v.e.write_cr_enable := '1';
|
|
crnum := to_integer(unsigned(e_in.const1(2 downto 0)));
|
|
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(e_in.const2(0), e_in.read_data1, e_in.read_data2);
|
|
end loop;
|
|
when OP_CMPL =>
|
|
v.e.write_cr_enable := '1';
|
|
crnum := to_integer(unsigned(e_in.const1(2 downto 0)));
|
|
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(e_in.const2(0), e_in.read_data1, e_in.read_data2);
|
|
end loop;
|
|
when OP_CNTLZW =>
|
|
result := ppc_cntlzw(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_CNTTZW =>
|
|
result := ppc_cnttzw(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_CNTLZD =>
|
|
result := ppc_cntlzd(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_CNTTZD =>
|
|
result := ppc_cnttzd(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_EXTSB =>
|
|
result := ppc_extsb(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_EXTSH =>
|
|
result := ppc_extsh(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_EXTSW =>
|
|
result := ppc_extsw(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_EQV =>
|
|
result := ppc_eqv(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_ISEL =>
|
|
crnum := to_integer(unsigned(e_in.const1));
|
|
if e_in.cr(31-crnum) = '1' then
|
|
result := e_in.read_data1;
|
|
else
|
|
result := e_in.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_in.read_data1;
|
|
when OP_MTLR =>
|
|
ctrl_tmp.lr <= e_in.read_data1;
|
|
when OP_MFCR =>
|
|
result := x"00000000" & e_in.cr;
|
|
result_en := 1;
|
|
when OP_MFOCRF =>
|
|
crnum := fxm_to_num(e_in.const1(7 downto 0));
|
|
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;
|
|
result_en := 1;
|
|
when OP_MTCRF =>
|
|
v.e.write_cr_enable := '1';
|
|
v.e.write_cr_mask := e_in.const1(7 downto 0);
|
|
v.e.write_cr_data := e_in.read_data1(31 downto 0);
|
|
when OP_MTOCRF =>
|
|
v.e.write_cr_enable := '1';
|
|
-- We require one hot priority encoding here
|
|
crnum := fxm_to_num(e_in.const1(7 downto 0));
|
|
v.e.write_cr_mask := num_to_fxm(crnum);
|
|
v.e.write_cr_data := e_in.read_data1(31 downto 0);
|
|
when OP_NAND =>
|
|
result := ppc_nand(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_NEG =>
|
|
result := ppc_neg(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_NOR =>
|
|
result := ppc_nor(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_OR =>
|
|
result := ppc_or(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_ORC =>
|
|
result := ppc_orc(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_POPCNTB =>
|
|
result := ppc_popcntb(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_POPCNTW =>
|
|
result := ppc_popcntw(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_POPCNTD =>
|
|
result := ppc_popcntd(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_PRTYD =>
|
|
result := ppc_prtyd(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_PRTYW =>
|
|
result := ppc_prtyw(e_in.read_data1);
|
|
result_en := 1;
|
|
when OP_RLDCL =>
|
|
result := ppc_rldcl(e_in.read_data1, e_in.read_data2, e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLDCR =>
|
|
result := ppc_rldcr(e_in.read_data1, e_in.read_data2, e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLDICL =>
|
|
result := ppc_rldicl(e_in.read_data1, e_in.const1(5 downto 0), e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLDICR =>
|
|
result := ppc_rldicr(e_in.read_data1, e_in.const1(5 downto 0), e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLWNM =>
|
|
result := ppc_rlwnm(e_in.read_data1, e_in.read_data2, e_in.const2(4 downto 0), e_in.const3(4 downto 0));
|
|
result_en := 1;
|
|
when OP_RLWINM =>
|
|
result := ppc_rlwinm(e_in.read_data1, e_in.const1(4 downto 0), e_in.const2(4 downto 0), e_in.const3(4 downto 0));
|
|
result_en := 1;
|
|
when OP_RLDIC =>
|
|
result := ppc_rldic(e_in.read_data1, e_in.const1(5 downto 0), e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLDIMI =>
|
|
result := ppc_rldimi(e_in.read_data1, e_in.read_data2, e_in.const1(5 downto 0), e_in.const2(5 downto 0));
|
|
result_en := 1;
|
|
when OP_RLWIMI =>
|
|
result := ppc_rlwimi(e_in.read_data1, e_in.read_data2, e_in.const1(4 downto 0), e_in.const2(4 downto 0), e_in.const3(4 downto 0));
|
|
result_en := 1;
|
|
when OP_SLD =>
|
|
result := ppc_sld(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_SLW =>
|
|
result := ppc_slw(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_SRAW =>
|
|
result_with_carry := ppc_sraw(e_in.read_data1, e_in.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_in.read_data1, e_in.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_in.read_data1, e_in.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_in.read_data1, e_in.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_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_SRW =>
|
|
result := ppc_srw(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_SUBF =>
|
|
result := ppc_subf(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
when OP_SUBFC =>
|
|
result_with_carry := ppc_subfe(e_in.read_data1, e_in.read_data2, ctrl.carry or not(e_in.input_carry));
|
|
result := result_with_carry(63 downto 0);
|
|
ctrl_tmp.carry <= result_with_carry(64) and e_in.output_carry;
|
|
result_en := 1;
|
|
when OP_XOR =>
|
|
result := ppc_xor(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
|
|
when OP_SIM_CONFIG =>
|
|
-- bit 0 was used to select the microwatt console, which
|
|
-- we no longer support.
|
|
if SIM = true then
|
|
result := x"0000000000000000";
|
|
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_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
else
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
end if;
|
|
when OP_DIVD =>
|
|
if SIM = true then
|
|
result := ppc_divd(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
else
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
end if;
|
|
when OP_DIVWU =>
|
|
if SIM = true then
|
|
result := ppc_divwu(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
else
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
end if;
|
|
when OP_DIVW =>
|
|
if SIM = true then
|
|
result := ppc_divw(e_in.read_data1, e_in.read_data2);
|
|
result_en := 1;
|
|
else
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
end if;
|
|
when others =>
|
|
terminate_out <= '1';
|
|
report "illegal";
|
|
end case;
|
|
|
|
if e_in.lr = '1' then
|
|
ctrl_tmp.lr <= std_ulogic_vector(unsigned(e_in.nia) + 4);
|
|
end if;
|
|
|
|
if result_en = 1 then
|
|
v.e.write_data := result;
|
|
v.e.write_enable := '1';
|
|
v.e.rc := e_in.rc;
|
|
end if;
|
|
end if;
|
|
|
|
-- Update registers
|
|
rin <= v;
|
|
|
|
-- update outputs
|
|
--f_out <= r.f;
|
|
e_out <= r.e;
|
|
end process;
|
|
end architecture behaviour;
|