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Merge pull request #216 from paulusmack/cfar

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Timing and speed improvements, implement CFAR register
pull/219/head
Michael Neuling 5 years ago committed by GitHub
parent 419c9a68e8 74062195ca
commit ce0205b262
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 152 additions and 93 deletions
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10
common.vhdl
Unescape Escape View File

@ -31,6 +31,7 @@ package common is
constant SPR_DEC : spr_num_t := 22;
constant SPR_SRR0 : spr_num_t := 26;
constant SPR_SRR1 : spr_num_t := 27;
constant SPR_CFAR : spr_num_t := 28;
constant SPR_HSRR0 : spr_num_t := 314;
constant SPR_HSRR1 : spr_num_t := 315;
constant SPR_SPRG0 : spr_num_t := 272;
@ -94,8 +95,8 @@ package common is
tb: std_ulogic_vector(63 downto 0);
dec: std_ulogic_vector(63 downto 0);
msr: std_ulogic_vector(63 downto 0);
cfar: 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;

@ -150,6 +151,7 @@ package common is
bypass_data2: std_ulogic;
bypass_data3: std_ulogic;
cr: std_ulogic_vector(31 downto 0);
bypass_cr : std_ulogic;
xerc: xer_common_t;
lr: std_ulogic;
rc: std_ulogic;
@ -172,7 +174,7 @@ package common is
end record;
constant Decode2ToExecute1Init : Decode2ToExecute1Type :=
(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',
bypass_cr => '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', xerc => xerc_init, reserve => '0', br_pred => '0',
byte_reverse => '0', sign_extend => '0', update => '0', nia => (others => '0'), read_data1 => (others => '0'), read_data2 => (others => '0'), read_data3 => (others => '0'), cr => (others => '0'), insn => (others => '0'), data_len => (others => '0'), others => (others => '0'));
@ -232,8 +234,8 @@ package common is
priv_mode: std_ulogic;
redirect_nia: std_ulogic_vector(63 downto 0);
end record;
constant Execute1ToFetch1TypeInit : Execute1ToFetch1Type := (redirect => '0', virt_mode => '0',
priv_mode => '0', others => (others => '0'));
constant Execute1ToFetch1Init : Execute1ToFetch1Type := (redirect => '0', virt_mode => '0',
priv_mode => '0', others => (others => '0'));

type Execute1ToLoadstore1Type is record
valid : std_ulogic;

8
control.vhdl
Unescape Escape View File

@ -38,6 +38,7 @@ entity control is

cr_read_in : in std_ulogic;
cr_write_in : in std_ulogic;
cr_bypassable : in std_ulogic;

valid_out : out std_ulogic;
stall_out : out std_ulogic;
@ -45,7 +46,8 @@ entity control is

gpr_bypass_a : out std_ulogic;
gpr_bypass_b : out std_ulogic;
gpr_bypass_c : out std_ulogic
gpr_bypass_c : out std_ulogic;
cr_bypass : out std_ulogic
);
end entity control;

@ -161,8 +163,10 @@ begin

cr_read_in => cr_read_in,
cr_write_in => cr_write_valid,
bypassable => cr_bypassable,

stall_out => cr_stall_out
stall_out => cr_stall_out,
use_bypass => cr_bypass
);

control0: process(clk)

25
cr_hazard.vhdl
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@ -16,15 +16,18 @@ entity cr_hazard is

cr_read_in : in std_ulogic;
cr_write_in : in std_ulogic;
bypassable : in std_ulogic;

stall_out : out std_ulogic
stall_out : out std_ulogic;
use_bypass : out std_ulogic
);
end entity cr_hazard;
architecture behaviour of cr_hazard is
type pipeline_entry_type is record
valid : std_ulogic;
valid : std_ulogic;
bypass : std_ulogic;
end record;
constant pipeline_entry_init : pipeline_entry_type := (valid => '0');
constant pipeline_entry_init : pipeline_entry_type := (valid => '0', bypass => '0');

type pipeline_t is array(0 to PIPELINE_DEPTH) of pipeline_entry_type;
constant pipeline_t_init : pipeline_t := (others => pipeline_entry_init);
@ -47,7 +50,20 @@ begin
if complete_in = '1' then
v(1).valid := '0';
end if;
stall_out <= cr_read_in and (v(0).valid or v(1).valid);

use_bypass <= '0';
stall_out <= '0';
if cr_read_in = '1' then
loop_0: for i in 0 to PIPELINE_DEPTH loop
if v(i).valid = '1' then
if r(i).bypass = '1' then
use_bypass <= '1';
else
stall_out <= '1';
end if;
end if;
end loop;
end if;

-- XXX assumes PIPELINE_DEPTH = 1
if busy_in = '0' then
@ -56,6 +72,7 @@ begin
end if;
if deferred = '0' and issuing = '1' then
v(0).valid := cr_write_in;
v(0).bypass := bypassable;
end if;
if flush_in = '1' then
v(0).valid := '0';

30
decode1.vhdl
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@ -60,7 +60,7 @@ architecture behaviour of decode1 is
41 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', '0', ZERO, '0', is2B, '0', '0', '1', '0', '0', '0', NONE, '0', '0'), -- lhzu
32 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- lwz
33 => (LDST, OP_LOAD, RA_OR_ZERO, CONST_SI, NONE, RT, '0', '0', '0', '0', ZERO, '0', is4B, '0', '0', '1', '0', '0', '0', NONE, '0', '0'), -- lwzu
7 => (ALU, OP_MUL_L64, RA, CONST_SI, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0'), -- mulli
7 => (ALU, OP_MUL_L64, RA, CONST_SI, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', NONE, '0', '0'), -- mulli
24 => (ALU, OP_OR, NONE, CONST_UI, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- ori
25 => (ALU, OP_OR, NONE, CONST_UI_HI, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- oris
20 => (ALU, OP_RLC, RA, CONST_SH32, RS, RA, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- rlwimi
@ -262,19 +262,19 @@ architecture behaviour of decode1 is
2#0010010000# => (ALU, OP_MTCRF, NONE, NONE, RS, NONE, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- mtcrf/mtocrf
2#0010110010# => (ALU, OP_MTMSRD, NONE, NONE, RS, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1'), -- mtmsrd # ignore top bits and d
2#0111010011# => (ALU, OP_MTSPR, NONE, NONE, RS, SPR, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0'), -- mtspr
2#0001001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulhd
2#0000001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- mulhdu
2#0001001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mulhw
2#0000001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- mulhwu
2#0001001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulhd
2#0000001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- mulhdu
2#0001001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mulhw
2#0000001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- mulhwu
-- next 4 have reserved bit set
2#1001001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulhd
2#1000001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- mulhdu
2#1001001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mulhw
2#1000001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- mulhwu
2#0011101001# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulld
2#1011101001# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulldo
2#0011101011# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mullw
2#1011101011# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '1', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mullwo
2#1001001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulhd
2#1000001001# => (ALU, OP_MUL_H64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- mulhdu
2#1001001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mulhw
2#1000001011# => (ALU, OP_MUL_H32, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '0', RC, '0', '0'), -- mulhwu
2#0011101001# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulld
2#1011101001# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '1', RC, '0', '0'), -- mulldo
2#0011101011# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mullw
2#1011101011# => (ALU, OP_MUL_L64, RA, RB, NONE, RT, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '1', '1', RC, '0', '0'), -- mullwo
2#0111011100# => (ALU, OP_AND, NONE, RB, RS, RA, '0', '0', '0', '1', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- nand
2#0001101000# => (ALU, OP_ADD, RA, NONE, NONE, RT, '0', '0', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- neg
2#1001101000# => (ALU, OP_ADD, RA, NONE, NONE, RT, '0', '0', '1', '0', ONE, '0', NONE, '0', '0', '0', '0', '0', '0', RC, '0', '0'), -- nego
@ -473,8 +473,8 @@ begin
end if;
else
-- Could be OP_RFID
v.ispr1 := fast_spr_num(SPR_SRR0);
v.ispr2 := fast_spr_num(SPR_SRR1);
v.ispr1 := fast_spr_num(SPR_SRR1);
v.ispr2 := fast_spr_num(SPR_SRR0);
end if;

elsif majorop = "011110" then

14
decode2.vhdl
Unescape Escape View File

@ -213,7 +213,10 @@ architecture behaviour of decode2 is
signal gpr_c_read : gpr_index_t;
signal gpr_c_bypass : std_ulogic;

signal cr_write_valid : std_ulogic;
signal cr_write_valid : std_ulogic;
signal cr_bypass : std_ulogic;
signal cr_bypass_avail : std_ulogic;

begin
control_0: entity work.control
generic map (
@ -248,7 +251,9 @@ begin
gpr_c_read_in => gpr_c_read,

cr_read_in => d_in.decode.input_cr,
cr_write_in => cr_write_valid,
cr_write_in => cr_write_valid,
cr_bypass => cr_bypass,
cr_bypassable => cr_bypass_avail,

valid_out => control_valid_out,
stall_out => stall_out,
@ -342,6 +347,7 @@ begin
v.e.oe := decode_oe(d_in.decode.rc, d_in.insn);
end if;
v.e.cr := c_in.read_cr_data;
v.e.bypass_cr := cr_bypass;
v.e.xerc := c_in.read_xerc_data;
v.e.invert_a := d_in.decode.invert_a;
v.e.invert_out := d_in.decode.invert_out;
@ -388,6 +394,10 @@ begin
gpr_c_read <= gspr_to_gpr(decoded_reg_c.reg);

cr_write_valid <= d_in.decode.output_cr or decode_rc(d_in.decode.rc, d_in.insn);
cr_bypass_avail <= '0';
if EX1_BYPASS then
cr_bypass_avail <= d_in.decode.output_cr;
end if;

v.e.valid := control_valid_out;
if d_in.decode.unit = NONE then

132
execute1.vhdl
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@ -48,6 +48,7 @@ end entity execute1;
architecture behaviour of execute1 is
type reg_type is record
e : Execute1ToWritebackType;
f : Execute1ToFetch1Type;
busy: std_ulogic;
terminate: std_ulogic;
lr_update : std_ulogic;
@ -64,7 +65,8 @@ architecture behaviour of execute1 is
log_addr_spr : std_ulogic_vector(31 downto 0);
end record;
constant reg_type_init : reg_type :=
(e => Execute1ToWritebackInit, busy => '0', lr_update => '0', terminate => '0',
(e => Execute1ToWritebackInit, f => Execute1ToFetch1Init,
busy => '0', lr_update => '0', terminate => '0',
mul_in_progress => '0', div_in_progress => '0', cntz_in_progress => '0',
slow_op_insn => OP_ILLEGAL, slow_op_rc => '0', slow_op_oe => '0', slow_op_xerc => xerc_init,
next_lr => (others => '0'), last_nia => (others => '0'), others => (others => '0'));
@ -72,6 +74,7 @@ architecture behaviour of execute1 is
signal r, rin : reg_type;

signal a_in, b_in, c_in : std_ulogic_vector(63 downto 0);
signal cr_in : std_ulogic_vector(31 downto 0);

signal valid_in : std_ulogic;
signal ctrl: ctrl_t := (irq_state => WRITE_SRR0, others => (others => '0'));
@ -316,6 +319,7 @@ begin
v := r;
v.e := Execute1ToWritebackInit;
lv := Execute1ToLoadstore1Init;
v.f.redirect := '0';

-- XER forwarding. To avoid having to track XER hazards, we
-- use the previously latched value.
@ -352,6 +356,16 @@ begin
v.e.xerc := e_in.xerc;
end if;

-- CR forwarding
cr_in <= e_in.cr;
if EX1_BYPASS and e_in.bypass_cr = '1' and r.e.write_cr_enable = '1' then
for i in 0 to 7 loop
if r.e.write_cr_mask(i) = '1' then
cr_in(i * 4 + 3 downto i * 4) <= r.e.write_cr_data(i * 4 + 3 downto i * 4);
end if;
end loop;
end if;

v.lr_update := '0';
v.mul_in_progress := '0';
v.div_in_progress := '0';
@ -423,11 +437,11 @@ begin
irq_valid := '0';
if ctrl.msr(MSR_EE) = '1' then
if ctrl.dec(63) = '1' then
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#900#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#900#, 64));
report "IRQ valid: DEC";
irq_valid := '1';
elsif ext_irq_in = '1' then
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#500#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#500#, 64));
report "IRQ valid: External";
irq_valid := '1';
end if;
@ -436,10 +450,9 @@ begin
v.terminate := '0';
icache_inval <= '0';
v.busy := '0';
f_out <= Execute1ToFetch1TypeInit;
-- send MSR[IR] and ~MSR[PR] up to fetch1
f_out.virt_mode <= ctrl.msr(MSR_IR);
f_out.priv_mode <= not ctrl.msr(MSR_PR);
v.f.virt_mode := ctrl.msr(MSR_IR);
v.f.priv_mode := not ctrl.msr(MSR_PR);

-- Next insn adder used in a couple of places
next_nia := std_ulogic_vector(unsigned(e_in.nia) + 4);
@ -450,6 +463,7 @@ begin
rot_clear_right <= '1' when e_in.insn_type = OP_RLC or e_in.insn_type = OP_RLCR else '0';
rot_sign_ext <= '1' when e_in.insn_type = OP_EXTSWSLI else '0';

ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
ctrl_tmp.irq_state <= WRITE_SRR0;
exception := '0';
illegal := '0';
@ -472,10 +486,6 @@ begin
ctrl_tmp.msr(MSR_DR) <= '0';
ctrl_tmp.msr(MSR_RI) <= '0';
ctrl_tmp.msr(MSR_LE) <= '1';
f_out.redirect <= '1';
f_out.virt_mode <= '0';
f_out.priv_mode <= '1';
f_out.redirect_nia <= ctrl.irq_nia;
v.e.valid := '1';
report "Writing SRR1: " & to_hstring(ctrl.srr1);

@ -485,14 +495,12 @@ begin
-- Don't deliver the interrupt until we have a valid instruction
-- coming in, so we have a valid NIA to put in SRR0.
exception := '1';
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);

elsif valid_in = '1' and ctrl.msr(MSR_PR) = '1' and
instr_is_privileged(e_in.insn_type, e_in.insn) then
-- generate a program interrupt
exception := '1';
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#700#, 64));
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
v.f.redirect_nia := std_logic_vector(to_unsigned(16#700#, 64));
-- set bit 45 to indicate privileged instruction type interrupt
ctrl_tmp.srr1(63 - 45) <= '1';
report "privileged instruction";
@ -522,8 +530,7 @@ begin
if e_in.insn(1) = '1' then
exception := '1';
exception_nextpc := '1';
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#C00#, 64));
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
v.f.redirect_nia := std_logic_vector(to_unsigned(16#C00#, 64));
report "sc";
else
illegal := '1';
@ -615,8 +622,7 @@ begin
if or (trapval and insn_to(e_in.insn)) = '1' then
-- generate trap-type program interrupt
exception := '1';
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#700#, 64));
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
v.f.redirect_nia := std_logic_vector(to_unsigned(16#700#, 64));
-- set bit 46 to say trap occurred
ctrl_tmp.srr1(63 - 46) <= '1';
report "trap";
@ -640,7 +646,7 @@ begin
v.e.write_reg := fast_spr_num(SPR_CTR);
end if;
is_branch := '1';
taken_branch := ppc_bc_taken(bo, bi, e_in.cr, a_in);
taken_branch := ppc_bc_taken(bo, bi, cr_in, a_in);
abs_branch := insn_aa(e_in.insn);
when OP_BCREG =>
-- read_data1 is CTR
@ -652,26 +658,27 @@ begin
result_en := '1';
v.e.write_reg := fast_spr_num(SPR_CTR);
end if;
if ppc_bc_taken(bo, bi, e_in.cr, a_in) = '1' then
f_out.redirect <= '1';
f_out.redirect_nia <= b_in(63 downto 2) & "00";
end if;
is_branch := '1';
taken_branch := ppc_bc_taken(bo, bi, cr_in, a_in);
abs_branch := '1';

when OP_RFID =>
f_out.redirect <= '1';
f_out.virt_mode <= b_in(MSR_IR) or b_in(MSR_PR);
f_out.priv_mode <= not b_in(MSR_PR);
f_out.redirect_nia <= a_in(63 downto 2) & "00"; -- srr0
v.f.virt_mode := a_in(MSR_IR) or a_in(MSR_PR);
v.f.priv_mode := not a_in(MSR_PR);
-- Can't use msr_copy here because the partial function MSR
-- bits should be left unchanged, not zeroed.
ctrl_tmp.msr(63 downto 31) <= b_in(63 downto 31);
ctrl_tmp.msr(26 downto 22) <= b_in(26 downto 22);
ctrl_tmp.msr(15 downto 0) <= b_in(15 downto 0);
if b_in(MSR_PR) = '1' then
ctrl_tmp.msr(63 downto 31) <= a_in(63 downto 31);
ctrl_tmp.msr(26 downto 22) <= a_in(26 downto 22);
ctrl_tmp.msr(15 downto 0) <= a_in(15 downto 0);
if a_in(MSR_PR) = '1' then
ctrl_tmp.msr(MSR_EE) <= '1';
ctrl_tmp.msr(MSR_IR) <= '1';
ctrl_tmp.msr(MSR_DR) <= '1';
end if;
-- mark this as a branch so CFAR gets updated
is_branch := '1';
taken_branch := '1';
abs_branch := '1';

when OP_CNTZ =>
v.e.valid := '0';
@ -679,7 +686,7 @@ begin
v.busy := '1';
when OP_ISEL =>
crbit := to_integer(unsigned(insn_bc(e_in.insn)));
if e_in.cr(31-crbit) = '1' then
if cr_in(31-crbit) = '1' then
result := a_in;
else
result := b_in;
@ -699,7 +706,7 @@ begin
lo := (7-i)*4;
hi := lo + 3;
if i = scrnum then
newcrf := e_in.cr(hi downto lo);
newcrf := cr_in(hi downto lo);
end if;
end loop;
for i in 0 to 7 loop
@ -717,14 +724,14 @@ begin
bbnum := 31 - to_integer(unsigned(bb));
-- Bits 5-8 of cr_op give the truth table of the requested
-- logical operation
cr_operands := e_in.cr(banum) & e_in.cr(bbnum);
cr_operands := cr_in(banum) & cr_in(bbnum);
crresult := cr_op(5 + to_integer(unsigned(cr_operands)));
v.e.write_cr_mask := num_to_fxm((31-btnum) / 4);
for i in 0 to 31 loop
if i = btnum then
v.e.write_cr_data(i) := crresult;
else
v.e.write_cr_data(i) := e_in.cr(i);
v.e.write_cr_data(i) := cr_in(i);
end if;
end loop;
end if;
@ -757,6 +764,8 @@ begin
spr_val(31 downto 0) := ctrl.tb(63 downto 32);
when SPR_DEC =>
spr_val := ctrl.dec;
when SPR_CFAR =>
spr_val := ctrl.cfar;
when 724 => -- LOG_ADDR SPR
spr_val := log_wr_addr & r.log_addr_spr;
when 725 => -- LOG_DATA SPR
@ -774,7 +783,7 @@ begin
when OP_MFCR =>
if e_in.insn(20) = '0' then
-- mfcr
result := x"00000000" & e_in.cr;
result := x"00000000" & cr_in;
else
-- mfocrf
crnum := fxm_to_num(insn_fxm(e_in.insn));
@ -783,7 +792,7 @@ begin
lo := (7-i)*4;
hi := lo + 3;
if crnum = i then
result(hi downto lo) := e_in.cr(hi downto lo);
result(hi downto lo) := cr_in(hi downto lo);
end if;
end loop;
end if;
@ -853,8 +862,8 @@ begin
result_en := '1';

when OP_ISYNC =>
f_out.redirect <= '1';
f_out.redirect_nia <= next_nia;
v.f.redirect := '1';
v.f.redirect_nia := next_nia;

when OP_ICBI =>
icache_inval <= '1';
@ -879,16 +888,21 @@ begin
v.e.rc := e_in.rc and valid_in;

-- Mispredicted branches cause a redirect
if is_branch = '1' and taken_branch /= e_in.br_pred then
f_out.redirect <= '1';
if is_branch = '1' then
if taken_branch = '1' then
ctrl_tmp.cfar <= e_in.nia;
end if;
if e_in.br_pred = '0' then
if abs_branch = '1' then
f_out.redirect_nia <= b_in;
v.f.redirect_nia := b_in;
else
f_out.redirect_nia <= std_ulogic_vector(signed(e_in.nia) + signed(b_in));
v.f.redirect_nia := std_ulogic_vector(signed(e_in.nia) + signed(b_in));
end if;
else
f_out.redirect_nia <= next_nia;
v.f.redirect_nia := next_nia;
end if;
if taken_branch /= e_in.br_pred then
v.f.redirect := '1';
end if;
end if;

@ -917,6 +931,8 @@ begin
lv.valid := '1';
end if;

elsif r.f.redirect = '1' then
v.e.valid := '1';
elsif r.lr_update = '1' then
v.e.exc_write_enable := '1';
v.e.exc_write_data := r.next_lr;
@ -973,8 +989,7 @@ begin

if illegal = '1' then
exception := '1';
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#700#, 64));
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
v.f.redirect_nia := std_logic_vector(to_unsigned(16#700#, 64));
-- Since we aren't doing Hypervisor emulation assist (0xe40) we
-- set bit 44 to indicate we have an illegal
ctrl_tmp.srr1(63 - 44) <= '1';
@ -985,23 +1000,19 @@ begin
if exception_nextpc = '1' then
v.e.exc_write_data := next_nia;
end if;
ctrl_tmp.irq_state <= WRITE_SRR1;
v.busy := '1';
v.e.valid := '0';
end if;

v.e.write_data := result;
v.e.write_enable := result_en;
v.e.write_enable := result_en and not exception;

-- generate DSI or DSegI for load/store exceptions
-- or ISI or ISegI for instruction fetch exceptions
if l_in.exception = '1' then
ctrl_tmp.srr1 <= msr_copy(ctrl.msr);
if l_in.instr_fault = '0' then
if l_in.segment_fault = '0' then
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#300#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#300#, 64));
else
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#380#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#380#, 64));
end if;
else
if l_in.segment_fault = '0' then
@ -1009,16 +1020,27 @@ begin
ctrl_tmp.srr1(63 - 35) <= l_in.perm_error; -- noexec fault
ctrl_tmp.srr1(63 - 44) <= l_in.badtree;
ctrl_tmp.srr1(63 - 45) <= l_in.rc_error;
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#400#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#400#, 64));
else
ctrl_tmp.irq_nia <= std_logic_vector(to_unsigned(16#480#, 64));
v.f.redirect_nia := std_logic_vector(to_unsigned(16#480#, 64));
end if;
end if;
v.e.exc_write_enable := '1';
v.e.exc_write_reg := fast_spr_num(SPR_SRR0);
v.e.exc_write_data := r.last_nia;
report "ldst exception writing srr0=" & to_hstring(r.last_nia);
end if;

if exception = '1' or l_in.exception = '1' then
ctrl_tmp.irq_state <= WRITE_SRR1;
v.f.redirect := '1';
v.f.virt_mode := '0';
v.f.priv_mode := '1';
end if;

if v.f.redirect = '1' then
v.busy := '1';
v.e.valid := '0';
end if;

-- Outputs to loadstore1 (async)
@ -1049,7 +1071,7 @@ begin
rin <= v;

-- update outputs
--f_out <= r.f;
f_out <= r.f;
l_out <= lv;
e_out <= r.e;
flush_out <= f_out.redirect;

4
fetch1.vhdl
Unescape Escape View File

@ -83,11 +83,11 @@ begin
v.priv_mode := '1';
v_int.stop_state := RUNNING;
elsif e_in.redirect = '1' then
v.nia := e_in.redirect_nia;
v.nia := e_in.redirect_nia(63 downto 2) & "00";
v.virt_mode := e_in.virt_mode;
v.priv_mode := e_in.priv_mode;
elsif d_in.redirect = '1' then
v.nia := d_in.redirect_nia;
v.nia := d_in.redirect_nia(63 downto 2) & "00";
elsif stall_in = '0' then

-- For debug stop/step to work properly we need a little bit of

22
logical.vhdl
Unescape Escape View File

@ -87,12 +87,19 @@ begin
end if;

case op is
when OP_AND =>
tmp := rs and rb_adj;
when OP_OR =>
tmp := rs or rb_adj;
when OP_XOR =>
tmp := rs xor rb_adj;
when OP_AND | OP_OR | OP_XOR =>
case op is
when OP_AND =>
tmp := rs and rb_adj;
when OP_OR =>
tmp := rs or rb_adj;
when others =>
tmp := rs xor rb_adj;
end case;
if invert_out = '1' then
tmp := not tmp;
end if;

when OP_POPCNT =>
tmp := popcnt;
when OP_PRTY =>
@ -115,9 +122,6 @@ begin
tmp(7 downto 0) := rs(7 downto 0);
end case;

if invert_out = '1' then
tmp := not tmp;
end if;
result <= tmp;

end process;

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