package common is
+ -- MSR bit numbers
+ constant MSR_SF : integer := (63 - 0); -- Sixty-Four bit mode
+ constant MSR_EE : integer := (63 - 48); -- External interrupt Enable
+ constant MSR_PR : integer := (63 - 49); -- PRoblem state
+ constant MSR_IR : integer := (63 - 58); -- Instruction Relocation
+ constant MSR_DR : integer := (63 - 59); -- Data Relocation
+ constant MSR_RI : integer := (63 - 62); -- Recoverable Interrupt
+ constant MSR_LE : integer := (63 - 63); -- Little Endian
+
-- 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_LR : spr_num_t := 8;
- constant SPR_CTR : spr_num_t := 9;
- constant SPR_TB : spr_num_t := 268;
+ 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;
+ constant SPR_DEC : spr_num_t := 22;
+ constant SPR_SRR0 : spr_num_t := 26;
+ constant SPR_SRR1 : spr_num_t := 27;
+ constant SPR_HSRR0 : spr_num_t := 314;
+ constant SPR_HSRR1 : spr_num_t := 315;
+ constant SPR_SPRG0 : spr_num_t := 272;
+ constant SPR_SPRG1 : spr_num_t := 273;
+ constant SPR_SPRG2 : spr_num_t := 274;
+ constant SPR_SPRG3 : spr_num_t := 275;
+ constant SPR_SPRG3U : spr_num_t := 259;
+ constant SPR_HSPRG0 : spr_num_t := 304;
+ constant SPR_HSPRG1 : spr_num_t := 305;
+
+ -- GPR indices in the register file (GPR only)
+ subtype gpr_index_t is std_ulogic_vector(4 downto 0);
+
+ -- Extended GPR indice (can hold an SPR)
+ subtype gspr_index_t is std_ulogic_vector(5 downto 0);
+ -- Some SPRs are stored in the register file, they use the magic
+ -- GPR numbers above 31.
+ --
+ -- The function fast_spr_num() returns the corresponding fast
+ -- pseudo-GPR number for a given SPR number. The result MSB
+ -- indicates if this is indeed a fast SPR. If clear, then
+ -- the SPR is not stored in the GPR file.
+ --
+ function fast_spr_num(spr: spr_num_t) return gspr_index_t;
+
+ -- Indices conversion functions
+ function gspr_to_gpr(i: gspr_index_t) return gpr_index_t;
+ function gpr_to_gspr(i: gpr_index_t) return gspr_index_t;
+ function gpr_or_spr_to_gspr(g: gpr_index_t; s: gspr_index_t) return gspr_index_t;
+ function is_fast_spr(s: gspr_index_t) return std_ulogic;
+
+ -- 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');
+
+ type irq_state_t is (WRITE_SRR0, WRITE_SRR1);
+
+ -- 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);
- carry: std_ulogic;
+ dec: std_ulogic_vector(63 downto 0);
+ msr: std_ulogic_vector(63 downto 0);
+ irq_state : irq_state_t;
+ irq_nia: std_ulogic_vector(63 downto 0);
+ srr1: std_ulogic_vector(63 downto 0);
end record;
type Fetch1ToIcacheType is record
stop_mark : std_ulogic;
nia: std_ulogic_vector(63 downto 0);
insn: std_ulogic_vector(31 downto 0);
+ ispr1: gspr_index_t; -- (G)SPR used for branch condition (CTR) or mfspr
+ ispr2: gspr_index_t; -- (G)SPR used for branch target (CTR, LR, TAR)
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;
+ unit : unit_t;
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);
+ write_reg: gspr_index_t;
+ read_reg1: gspr_index_t;
+ read_reg2: gspr_index_t;
read_data1: std_ulogic_vector(63 downto 0);
read_data2: std_ulogic_vector(63 downto 0);
read_data3: std_ulogic_vector(63 downto 0);
+ bypass_data1: std_ulogic;
+ bypass_data2: std_ulogic;
+ bypass_data3: std_ulogic;
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;
is_signed: std_ulogic;
insn: std_ulogic_vector(31 downto 0);
data_len: 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?
+ reserve : std_ulogic; -- set for larx/stcx
end record;
constant Decode2ToExecute1Init : Decode2ToExecute1Type :=
- (valid => '0', insn_type => OP_ILLEGAL, lr => '0', rc => '0', invert_a => '0',
+ (valid => '0', unit => NONE, insn_type => OP_ILLEGAL, bypass_data1 => '0', bypass_data2 => '0', bypass_data3 => '0',
+ 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', others => (others => '0'));
+ is_32bit => '0', is_signed => '0', xerc => xerc_init, reserve => '0',
+ byte_reverse => '0', sign_extend => '0', update => '0', others => (others => '0'));
- type Decode2ToMultiplyType is record
+ type Execute1ToMultiplyType 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;
+ is_32bit: std_ulogic;
end record;
- constant Decode2ToMultiplyInit : Decode2ToMultiplyType := (valid => '0', insn_type => OP_ILLEGAL, rc => '0', others => (others => '0'));
+ constant Execute1ToMultiplyInit : Execute1ToMultiplyType := (valid => '0', insn_type => OP_ILLEGAL,
+ is_32bit => '0',
+ others => (others => '0'));
- type Decode2ToDividerType is record
+ type Execute1ToDividerType 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;
+ neg_result: std_ulogic;
end record;
- constant Decode2ToDividerInit: Decode2ToDividerType := (valid => '0', is_signed => '0', is_32bit => '0', is_extended => '0', is_modulus => '0', rc => '0', others => (others => '0'));
+ constant Execute1ToDividerInit: Execute1ToDividerType := (valid => '0', is_signed => '0', is_32bit => '0',
+ is_extended => '0', is_modulus => '0',
+ neg_result => '0', others => (others => '0'));
type Decode2ToRegisterFileType is record
read1_enable : std_ulogic;
- read1_reg : std_ulogic_vector(4 downto 0);
+ read1_reg : gspr_index_t;
read2_enable : std_ulogic;
- read2_reg : std_ulogic_vector(4 downto 0);
+ read2_reg : gspr_index_t;
read3_enable : std_ulogic;
- read3_reg : std_ulogic_vector(4 downto 0);
+ read3_reg : gpr_index_t;
end record;
type RegisterFileToDecode2Type is 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
end record;
constant Execute1ToFetch1TypeInit : Execute1ToFetch1Type := (redirect => '0', others => (others => '0'));
- type Decode2ToLoadstore1Type is record
+ type Execute1ToLoadstore1Type is record
valid : std_ulogic;
- load : std_ulogic; -- is this a load or store
+ op : insn_type_t; -- what ld/st op to do
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
+ write_reg : gpr_index_t;
length : std_ulogic_vector(3 downto 0);
+ ci : std_ulogic; -- cache-inhibited load/store
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
+ update_reg : gpr_index_t; -- if so, the register to update
+ xerc : xer_common_t;
+ reserve : std_ulogic; -- set for larx/stcx.
+ rc : std_ulogic; -- set for stcx.
end record;
- constant Decode2ToLoadstore1Init : Decode2ToLoadstore1Type := (valid => '0', load => '0', byte_reverse => '0', sign_extend => '0', update => '0', others => (others => '0'));
+ constant Execute1ToLoadstore1Init : Execute1ToLoadstore1Type := (valid => '0', op => OP_ILLEGAL, ci => '0', byte_reverse => '0',
+ sign_extend => '0', update => '0', xerc => xerc_init,
+ reserve => '0', rc => '0', others => (others => '0'));
type Loadstore1ToDcacheType is record
valid : std_ulogic;
load : std_ulogic;
+ dcbz : std_ulogic;
nc : std_ulogic;
+ reserve : 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);
+ byte_sel : std_ulogic_vector(7 downto 0);
end record;
- type DcacheToWritebackType is record
+ type DcacheToLoadstore1Type is record
+ valid : std_ulogic;
+ data : std_ulogic_vector(63 downto 0);
+ store_done : std_ulogic;
+ error : std_ulogic;
+ end record;
+
+ type Loadstore1ToWritebackType is record
valid : std_ulogic;
write_enable: std_ulogic;
- write_reg : std_ulogic_vector(4 downto 0);
+ write_reg : gpr_index_t;
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;
+ rc : std_ulogic;
+ store_done : std_ulogic;
end record;
- constant DcacheToWritebackInit : DcacheToWritebackType := (valid => '0', write_enable => '0', sign_extend => '0', byte_reverse => '0', second_word => '0', others => (others => '0'));
+ constant Loadstore1ToWritebackInit : Loadstore1ToWritebackType := (valid => '0', write_enable => '0', xerc => xerc_init,
+ rc => '0', store_done => '0', 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_reg: gspr_index_t;
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);
- sign_extend: std_ulogic;
+ write_xerc_enable : std_ulogic;
+ xerc : xer_common_t;
+ exc_write_enable : std_ulogic;
+ exc_write_reg : gspr_index_t;
+ exc_write_data : std_ulogic_vector(63 downto 0);
end record;
- constant Execute1ToWritebackInit : Execute1ToWritebackType := (valid => '0', rc => '0', write_enable => '0', write_cr_enable => '0', sign_extend => '0', others => (others => '0'));
+ constant Execute1ToWritebackInit : Execute1ToWritebackType := (valid => '0', rc => '0', write_enable => '0',
+ write_cr_enable => '0', exc_write_enable => '0',
+ write_xerc_enable => '0', xerc => xerc_init,
+ others => (others => '0'));
- type MultiplyToWritebackType is record
+ type MultiplyToExecute1Type 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);
- rc: std_ulogic;
+ overflow : std_ulogic;
end record;
- constant MultiplyToWritebackInit : MultiplyToWritebackType := (valid => '0', write_reg_enable => '0', rc => '0', others => (others => '0'));
+ constant MultiplyToExecute1Init : MultiplyToExecute1Type := (valid => '0', overflow => '0',
+ others => (others => '0'));
- type DividerToWritebackType is record
+ type DividerToExecute1Type 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);
- rc: std_ulogic;
+ overflow : std_ulogic;
end record;
- constant DividerToWritebackInit : DividerToWritebackType := (valid => '0', write_reg_enable => '0', rc => '0', others => (others => '0'));
+ constant DividerToExecute1Init : DividerToExecute1Type := (valid => '0', overflow => '0',
+ others => (others => '0'));
type WritebackToRegisterFileType is record
- write_reg : std_ulogic_vector(4 downto 0);
+ write_reg : gspr_index_t;
write_data : std_ulogic_vector(63 downto 0);
write_enable : std_ulogic;
end 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'));
+
+ type XicsToExecute1Type is record
+ irq : std_ulogic;
end record;
- constant WritebackToCrFileInit : WritebackToCrFileType := (write_cr_enable => '0', others => (others => '0'));
end common;
begin
return to_integer(unsigned(insn(15 downto 11) & insn(20 downto 16)));
end;
+ function fast_spr_num(spr: spr_num_t) return gspr_index_t is
+ variable n : integer range 0 to 31;
+ begin
+ case spr is
+ when SPR_LR =>
+ n := 0;
+ when SPR_CTR =>
+ n:= 1;
+ when SPR_SRR0 =>
+ n := 2;
+ when SPR_SRR1 =>
+ n := 3;
+ when SPR_HSRR0 =>
+ n := 4;
+ when SPR_HSRR1 =>
+ n := 5;
+ when SPR_SPRG0 =>
+ n := 6;
+ when SPR_SPRG1 =>
+ n := 7;
+ when SPR_SPRG2 =>
+ n := 8;
+ when SPR_SPRG3 | SPR_SPRG3U =>
+ n := 9;
+ when SPR_HSPRG0 =>
+ n := 10;
+ when SPR_HSPRG1 =>
+ n := 11;
+ when SPR_XER =>
+ n := 12;
+ when others =>
+ n := 0;
+ return "000000";
+ end case;
+ return "1" & std_ulogic_vector(to_unsigned(n, 5));
+ end;
+
+ function gspr_to_gpr(i: gspr_index_t) return gpr_index_t is
+ begin
+ return i(4 downto 0);
+ end;
+
+ function gpr_to_gspr(i: gpr_index_t) return gspr_index_t is
+ begin
+ return "0" & i;
+ end;
+
+ function gpr_or_spr_to_gspr(g: gpr_index_t; s: gspr_index_t) return gspr_index_t is
+ begin
+ if s(5) = '1' then
+ return s;
+ else
+ return gpr_to_gspr(g);
+ end if;
+ end;
+
+ function is_fast_spr(s: gspr_index_t) return std_ulogic is
+ begin
+ return s(5);
+ end;
end common;
projects / microwatt.git / blobdiff