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microwatt/common.vhdl

286 lines
9.6 KiB
VHDL

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
library work;
use work.decode_types.all;
package common is
-- SPR numbers
subtype spr_num_t is integer range 0 to 1023;
function decode_spr_num(insn: std_ulogic_vector(31 downto 0)) return spr_num_t;
constant SPR_XER : spr_num_t := 1;
constant SPR_LR : spr_num_t := 8;
constant SPR_CTR : spr_num_t := 9;
constant SPR_TB : spr_num_t := 268;
-- The XER is split: the common bits (CA, OV, SO, OV32 and CA32) are
-- in the CR file as a kind of CR extension (with a separate write
-- control). The rest is stored as a fast SPR.
type xer_common_t is record
ca : std_ulogic;
ca32 : std_ulogic;
ov : std_ulogic;
ov32 : std_ulogic;
so : std_ulogic;
end record;
constant xerc_init : xer_common_t := (others => '0');
-- This needs to die...
type ctrl_t is record
lr: std_ulogic_vector(63 downto 0);
ctr: std_ulogic_vector(63 downto 0);
tb: std_ulogic_vector(63 downto 0);
end record;
type Fetch1ToIcacheType is record
req: std_ulogic;
stop_mark: std_ulogic;
nia: std_ulogic_vector(63 downto 0);
end record;
type IcacheToFetch2Type is record
valid: std_ulogic;
stop_mark: std_ulogic;
nia: std_ulogic_vector(63 downto 0);
insn: std_ulogic_vector(31 downto 0);
end record;
type Fetch2ToDecode1Type is record
valid: std_ulogic;
stop_mark : std_ulogic;
nia: std_ulogic_vector(63 downto 0);
insn: std_ulogic_vector(31 downto 0);
end record;
constant Fetch2ToDecode1Init : Fetch2ToDecode1Type := (valid => '0', stop_mark => '0', others => (others => '0'));
type Decode1ToDecode2Type is record
valid: std_ulogic;
stop_mark : std_ulogic;
nia: std_ulogic_vector(63 downto 0);
insn: std_ulogic_vector(31 downto 0);
decode: decode_rom_t;
end record;
constant Decode1ToDecode2Init : Decode1ToDecode2Type := (valid => '0', stop_mark => '0', decode => decode_rom_init, others => (others => '0'));
type Decode2ToExecute1Type is record
valid: std_ulogic;
insn_type: insn_type_t;
nia: std_ulogic_vector(63 downto 0);
write_reg: std_ulogic_vector(4 downto 0);
read_reg1: std_ulogic_vector(4 downto 0);
read_reg2: std_ulogic_vector(4 downto 0);
read_data1: std_ulogic_vector(63 downto 0);
read_data2: std_ulogic_vector(63 downto 0);
read_data3: std_ulogic_vector(63 downto 0);
cr: std_ulogic_vector(31 downto 0);
xerc: xer_common_t;
lr: std_ulogic;
rc: std_ulogic;
oe: std_ulogic;
invert_a: std_ulogic;
invert_out: std_ulogic;
input_carry: carry_in_t;
output_carry: std_ulogic;
input_cr: std_ulogic;
output_cr: std_ulogic;
is_32bit: std_ulogic;
is_signed: std_ulogic;
insn: std_ulogic_vector(31 downto 0);
data_len: std_ulogic_vector(3 downto 0);
end record;
constant Decode2ToExecute1Init : Decode2ToExecute1Type :=
(valid => '0', insn_type => OP_ILLEGAL, lr => '0', rc => '0', oe => '0', invert_a => '0',
invert_out => '0', input_carry => ZERO, output_carry => '0', input_cr => '0', output_cr => '0',
is_32bit => '0', is_signed => '0', xerc => xerc_init, others => (others => '0'));
type Decode2ToMultiplyType is record
valid: std_ulogic;
insn_type: insn_type_t;
write_reg: std_ulogic_vector(4 downto 0);
data1: std_ulogic_vector(64 downto 0);
data2: std_ulogic_vector(64 downto 0);
rc: std_ulogic;
oe: std_ulogic;
is_32bit: std_ulogic;
xerc: xer_common_t;
end record;
constant Decode2ToMultiplyInit : Decode2ToMultiplyType := (valid => '0', insn_type => OP_ILLEGAL, rc => '0',
oe => '0', is_32bit => '0', xerc => xerc_init,
others => (others => '0'));
type Decode2ToDividerType is record
valid: std_ulogic;
write_reg: std_ulogic_vector(4 downto 0);
dividend: std_ulogic_vector(63 downto 0);
divisor: std_ulogic_vector(63 downto 0);
is_signed: std_ulogic;
is_32bit: std_ulogic;
is_extended: std_ulogic;
is_modulus: std_ulogic;
rc: std_ulogic;
oe: std_ulogic;
xerc: xer_common_t;
end record;
constant Decode2ToDividerInit: Decode2ToDividerType := (valid => '0', is_signed => '0', is_32bit => '0',
is_extended => '0', is_modulus => '0',
rc => '0', oe => '0', xerc => xerc_init,
others => (others => '0'));
type Decode2ToRegisterFileType is record
read1_enable : std_ulogic;
read1_reg : std_ulogic_vector(4 downto 0);
read2_enable : std_ulogic;
read2_reg : std_ulogic_vector(4 downto 0);
read3_enable : std_ulogic;
read3_reg : std_ulogic_vector(4 downto 0);
end record;
type RegisterFileToDecode2Type is record
read1_data : std_ulogic_vector(63 downto 0);
read2_data : std_ulogic_vector(63 downto 0);
read3_data : std_ulogic_vector(63 downto 0);
end record;
type Decode2ToCrFileType is record
read : std_ulogic;
end record;
type CrFileToDecode2Type is record
read_cr_data : std_ulogic_vector(31 downto 0);
read_xerc_data : xer_common_t;
end record;
type Execute1ToFetch1Type is record
redirect: std_ulogic;
redirect_nia: std_ulogic_vector(63 downto 0);
end record;
constant Execute1ToFetch1TypeInit : Execute1ToFetch1Type := (redirect => '0', others => (others => '0'));
type Decode2ToLoadstore1Type is record
valid : std_ulogic;
load : std_ulogic; -- is this a load or store
addr1 : std_ulogic_vector(63 downto 0);
addr2 : std_ulogic_vector(63 downto 0);
data : std_ulogic_vector(63 downto 0); -- data to write, unused for read
write_reg : std_ulogic_vector(4 downto 0); -- read data goes to this register
length : std_ulogic_vector(3 downto 0);
byte_reverse : std_ulogic;
sign_extend : std_ulogic; -- do we need to sign extend?
update : std_ulogic; -- is this an update instruction?
update_reg : std_ulogic_vector(4 downto 0); -- if so, the register to update
xerc : xer_common_t;
end record;
constant Decode2ToLoadstore1Init : Decode2ToLoadstore1Type := (valid => '0', load => '0', byte_reverse => '0',
sign_extend => '0', update => '0', xerc => xerc_init,
others => (others => '0'));
type Loadstore1ToDcacheType is record
valid : std_ulogic;
load : std_ulogic;
nc : std_ulogic;
addr : std_ulogic_vector(63 downto 0);
data : std_ulogic_vector(63 downto 0);
write_reg : std_ulogic_vector(4 downto 0);
length : std_ulogic_vector(3 downto 0);
byte_reverse : std_ulogic;
sign_extend : std_ulogic;
update : std_ulogic;
update_reg : std_ulogic_vector(4 downto 0);
xerc : xer_common_t;
end record;
type DcacheToWritebackType is record
valid : std_ulogic;
write_enable: std_ulogic;
write_reg : std_ulogic_vector(4 downto 0);
write_data : std_ulogic_vector(63 downto 0);
write_len : std_ulogic_vector(3 downto 0);
write_shift : std_ulogic_vector(2 downto 0);
sign_extend : std_ulogic;
byte_reverse : std_ulogic;
second_word : std_ulogic;
xerc : xer_common_t;
end record;
constant DcacheToWritebackInit : DcacheToWritebackType := (valid => '0', write_enable => '0', sign_extend => '0',
byte_reverse => '0', second_word => '0', xerc => xerc_init,
others => (others => '0'));
type Execute1ToWritebackType is record
valid: std_ulogic;
rc : std_ulogic;
write_enable : std_ulogic;
write_reg: std_ulogic_vector(4 downto 0);
write_data: std_ulogic_vector(63 downto 0);
write_len : std_ulogic_vector(3 downto 0);
write_cr_enable : std_ulogic;
write_cr_mask : std_ulogic_vector(7 downto 0);
write_cr_data : std_ulogic_vector(31 downto 0);
write_xerc_enable : std_ulogic;
xerc : xer_common_t;
sign_extend: std_ulogic;
end record;
constant Execute1ToWritebackInit : Execute1ToWritebackType := (valid => '0', rc => '0', write_enable => '0',
write_cr_enable => '0', sign_extend => '0',
write_xerc_enable => '0', xerc => xerc_init,
others => (others => '0'));
type MultiplyToWritebackType is record
valid: std_ulogic;
write_reg_enable : std_ulogic;
write_reg_nr: std_ulogic_vector(4 downto 0);
write_reg_data: std_ulogic_vector(63 downto 0);
write_xerc_enable : std_ulogic;
xerc : xer_common_t;
rc: std_ulogic;
end record;
constant MultiplyToWritebackInit : MultiplyToWritebackType := (valid => '0', write_reg_enable => '0',
rc => '0', write_xerc_enable => '0',
xerc => xerc_init,
others => (others => '0'));
type DividerToWritebackType is record
valid: std_ulogic;
write_reg_enable : std_ulogic;
write_reg_nr: std_ulogic_vector(4 downto 0);
write_reg_data: std_ulogic_vector(63 downto 0);
write_xerc_enable : std_ulogic;
xerc : xer_common_t;
rc: std_ulogic;
end record;
constant DividerToWritebackInit : DividerToWritebackType := (valid => '0', write_reg_enable => '0',
rc => '0', write_xerc_enable => '0',
xerc => xerc_init,
others => (others => '0'));
type WritebackToRegisterFileType is record
write_reg : std_ulogic_vector(4 downto 0);
write_data : std_ulogic_vector(63 downto 0);
write_enable : std_ulogic;
end record;
constant WritebackToRegisterFileInit : WritebackToRegisterFileType := (write_enable => '0', others => (others => '0'));
type WritebackToCrFileType is record
write_cr_enable : std_ulogic;
write_cr_mask : std_ulogic_vector(7 downto 0);
write_cr_data : std_ulogic_vector(31 downto 0);
write_xerc_enable : std_ulogic;
write_xerc_data : xer_common_t;
end record;
constant WritebackToCrFileInit : WritebackToCrFileType := (write_cr_enable => '0', write_xerc_enable => '0',
write_xerc_data => xerc_init,
others => (others => '0'));
end common;
package body common is
function decode_spr_num(insn: std_ulogic_vector(31 downto 0)) return spr_num_t is
begin
return to_integer(unsigned(insn(15 downto 11) & insn(20 downto 16)));
end;
end common;