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microwatt/core.vhdl

341 lines
10 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.common.all;
use work.wishbone_types.all;
entity core is
generic (
SIM : boolean := false;
DISABLE_FLATTEN : boolean := false;
EX1_BYPASS : boolean := true;
ALT_RESET_ADDRESS : std_ulogic_vector(63 downto 0) := (others => '0')
);
port (
clk : in std_ulogic;
rst : in std_ulogic;
-- Alternate reset (0xffff0000) for use by DRAM init fw
alt_reset : in std_ulogic;
-- Wishbone interface
wishbone_insn_in : in wishbone_slave_out;
wishbone_insn_out : out wishbone_master_out;
wishbone_data_in : in wishbone_slave_out;
wishbone_data_out : out wishbone_master_out;
dmi_addr : in std_ulogic_vector(3 downto 0);
dmi_din : in std_ulogic_vector(63 downto 0);
dmi_dout : out std_ulogic_vector(63 downto 0);
dmi_req : in std_ulogic;
dmi_wr : in std_ulogic;
dmi_ack : out std_ulogic;
xics_in : in XicsToExecute1Type;
terminated_out : out std_logic
);
end core;
architecture behave of core is
-- fetch signals
signal fetch2_to_decode1: Fetch2ToDecode1Type;
-- icache signals
signal fetch1_to_icache : Fetch1ToIcacheType;
signal icache_to_fetch2 : IcacheToFetch2Type;
-- decode signals
signal decode1_to_decode2: Decode1ToDecode2Type;
signal decode2_to_execute1: Decode2ToExecute1Type;
-- register file signals
signal register_file_to_decode2: RegisterFileToDecode2Type;
signal decode2_to_register_file: Decode2ToRegisterFileType;
signal writeback_to_register_file: WritebackToRegisterFileType;
-- CR file signals
signal decode2_to_cr_file: Decode2ToCrFileType;
signal cr_file_to_decode2: CrFileToDecode2Type;
signal writeback_to_cr_file: WritebackToCrFileType;
-- execute signals
signal execute1_to_writeback: Execute1ToWritebackType;
signal execute1_to_fetch1: Execute1ToFetch1Type;
-- load store signals
signal execute1_to_loadstore1: Execute1ToLoadstore1Type;
signal loadstore1_to_writeback: Loadstore1ToWritebackType;
-- dcache signals
signal loadstore1_to_dcache: Loadstore1ToDcacheType;
signal dcache_to_loadstore1: DcacheToLoadstore1Type;
-- local signals
signal fetch1_stall_in : std_ulogic;
signal icache_stall_out : std_ulogic;
signal fetch2_stall_in : std_ulogic;
signal decode1_stall_in : std_ulogic;
signal decode2_stall_in : std_ulogic;
signal decode2_stall_out : std_ulogic;
signal ex1_icache_inval: std_ulogic;
signal ex1_stall_out: std_ulogic;
signal ls1_stall_out: std_ulogic;
signal dcache_stall_out: std_ulogic;
signal flush: std_ulogic;
signal complete: std_ulogic;
signal terminate: std_ulogic;
signal core_rst: std_ulogic;
signal icache_inv: std_ulogic;
-- Delayed/Latched resets and alt_reset
signal rst_fetch1 : std_ulogic := '1';
signal rst_fetch2 : std_ulogic := '1';
signal rst_icache : std_ulogic := '1';
signal rst_dcache : std_ulogic := '1';
signal rst_dec1 : std_ulogic := '1';
signal rst_dec2 : std_ulogic := '1';
signal rst_ex1 : std_ulogic := '1';
signal rst_ls1 : std_ulogic := '1';
signal rst_dbg : std_ulogic := '1';
signal alt_reset_d : std_ulogic;
signal sim_cr_dump: std_ulogic;
-- Debug actions
signal dbg_core_stop: std_ulogic;
signal dbg_core_rst: std_ulogic;
signal dbg_icache_rst: std_ulogic;
-- Debug status
signal dbg_core_is_stopped: std_ulogic;
function keep_h(disable : boolean) return string is
begin
if disable then
return "yes";
else
return "no";
end if;
end function;
attribute keep_hierarchy : string;
attribute keep_hierarchy of fetch1_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of icache_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of fetch2_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of decode1_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of decode2_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of register_file_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of cr_file_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of execute1_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of loadstore1_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of dcache_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of writeback_0 : label is keep_h(DISABLE_FLATTEN);
attribute keep_hierarchy of debug_0 : label is keep_h(DISABLE_FLATTEN);
begin
core_rst <= dbg_core_rst or rst;
resets: process(clk)
begin
if rising_edge(clk) then
rst_fetch1 <= core_rst;
rst_fetch2 <= core_rst;
rst_icache <= core_rst or dbg_icache_rst or ex1_icache_inval;
rst_dcache <= core_rst;
rst_dec1 <= core_rst;
rst_dec2 <= core_rst;
rst_ex1 <= core_rst;
rst_ls1 <= core_rst;
rst_dbg <= rst;
alt_reset_d <= alt_reset;
end if;
end process;
fetch1_0: entity work.fetch1
generic map (
RESET_ADDRESS => (others => '0'),
ALT_RESET_ADDRESS => ALT_RESET_ADDRESS
)
port map (
clk => clk,
rst => rst_fetch1,
alt_reset_in => alt_reset_d,
stall_in => fetch1_stall_in,
flush_in => flush,
stop_in => dbg_core_stop,
e_in => execute1_to_fetch1,
i_out => fetch1_to_icache
);
fetch1_stall_in <= icache_stall_out or decode2_stall_out;
icache_0: entity work.icache
generic map(
SIM => SIM,
LINE_SIZE => 64,
NUM_LINES => 32,
NUM_WAYS => 2
)
port map(
clk => clk,
rst => rst_icache,
i_in => fetch1_to_icache,
i_out => icache_to_fetch2,
flush_in => flush,
stall_out => icache_stall_out,
wishbone_out => wishbone_insn_out,
wishbone_in => wishbone_insn_in
);
fetch2_0: entity work.fetch2
port map (
clk => clk,
rst => rst_fetch2,
stall_in => fetch2_stall_in,
flush_in => flush,
i_in => icache_to_fetch2,
f_out => fetch2_to_decode1
);
fetch2_stall_in <= decode2_stall_out;
decode1_0: entity work.decode1
port map (
clk => clk,
rst => rst_dec1,
stall_in => decode1_stall_in,
flush_in => flush,
f_in => fetch2_to_decode1,
d_out => decode1_to_decode2
);
decode1_stall_in <= decode2_stall_out;
decode2_0: entity work.decode2
generic map (
EX1_BYPASS => EX1_BYPASS
)
port map (
clk => clk,
rst => rst_dec2,
stall_in => decode2_stall_in,
stall_out => decode2_stall_out,
flush_in => flush,
complete_in => complete,
stopped_out => dbg_core_is_stopped,
d_in => decode1_to_decode2,
e_out => decode2_to_execute1,
r_in => register_file_to_decode2,
r_out => decode2_to_register_file,
c_in => cr_file_to_decode2,
c_out => decode2_to_cr_file
);
decode2_stall_in <= ex1_stall_out or ls1_stall_out;
register_file_0: entity work.register_file
generic map (
SIM => SIM
)
port map (
clk => clk,
d_in => decode2_to_register_file,
d_out => register_file_to_decode2,
w_in => writeback_to_register_file,
sim_dump => terminate,
sim_dump_done => sim_cr_dump
);
cr_file_0: entity work.cr_file
generic map (
SIM => SIM
)
port map (
clk => clk,
d_in => decode2_to_cr_file,
d_out => cr_file_to_decode2,
w_in => writeback_to_cr_file,
sim_dump => sim_cr_dump
);
execute1_0: entity work.execute1
generic map (
EX1_BYPASS => EX1_BYPASS
)
port map (
clk => clk,
rst => rst_ex1,
flush_out => flush,
stall_out => ex1_stall_out,
e_in => decode2_to_execute1,
i_in => xics_in,
l_out => execute1_to_loadstore1,
f_out => execute1_to_fetch1,
e_out => execute1_to_writeback,
icache_inval => ex1_icache_inval,
terminate_out => terminate
);
loadstore1_0: entity work.loadstore1
port map (
clk => clk,
rst => rst_ls1,
l_in => execute1_to_loadstore1,
l_out => loadstore1_to_writeback,
d_out => loadstore1_to_dcache,
d_in => dcache_to_loadstore1,
dc_stall => dcache_stall_out,
stall_out => ls1_stall_out
);
dcache_0: entity work.dcache
generic map(
LINE_SIZE => 64,
NUM_LINES => 32,
NUM_WAYS => 2
)
port map (
clk => clk,
rst => rst_dcache,
d_in => loadstore1_to_dcache,
d_out => dcache_to_loadstore1,
stall_out => dcache_stall_out,
wishbone_in => wishbone_data_in,
wishbone_out => wishbone_data_out
);
writeback_0: entity work.writeback
port map (
clk => clk,
e_in => execute1_to_writeback,
l_in => loadstore1_to_writeback,
w_out => writeback_to_register_file,
c_out => writeback_to_cr_file,
complete_out => complete
);
debug_0: entity work.core_debug
port map (
clk => clk,
rst => rst_dbg,
dmi_addr => dmi_addr,
dmi_din => dmi_din,
dmi_dout => dmi_dout,
dmi_req => dmi_req,
dmi_wr => dmi_wr,
dmi_ack => dmi_ack,
core_stop => dbg_core_stop,
core_rst => dbg_core_rst,
icache_rst => dbg_icache_rst,
terminate => terminate,
core_stopped => dbg_core_is_stopped,
nia => fetch1_to_icache.nia,
terminated_out => terminated_out
);
end behave;