cores
/
microwatt
mirror of https://github.com/antonblanchard/microwatt
3
1
Fork 1
Code Issues Projects Releases Wiki Activity

Reformat crhelpers, and remove some stale code

Browse Source 
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
pull/66/head
Anton Blanchard 5 years ago committed by Anton Blanchard
parent ae42370d24
commit 7e7010c304
1 changed files with 39 additions and 119 deletions
Show Stats Download Patch File Download Diff File

158
crhelpers.vhdl
Unescape Escape View File

@ -5,130 +5,50 @@ library work;
use work.common.all;

package crhelpers is
function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer;
function num_to_fxm(num: integer) return std_ulogic_vector;
--function from_crfile(cr: crfile) return std_ulogic_vector;
--function extract_one_crfield(cr: crfile; fxm: std_ulogic_vector(7 downto 0)) return std_ulogic_vector;
--function insert_multiple_crfields(cr_in: crfile; rs: std_ulogic_vector(63 downto 0); fxm: std_ulogic_vector(7 downto 0)) return crfile;
--function insert_one_crfield(cr_in: crfile; rs: std_ulogic_vector(63 downto 0); fxm: std_ulogic_vector(7 downto 0)) return crfile;
function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer;
function num_to_fxm(num: integer) return std_ulogic_vector;
end package crhelpers;

package body crhelpers is

function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer is
begin
-- If multiple fields are set (undefined), match existing
-- hardware by returning the first one.
for i in 0 to 7 loop
-- Big endian bit numbering
if fxm(7-i) = '1' then
return i;
end if;
end loop;
function fxm_to_num(fxm: std_ulogic_vector(7 downto 0)) return integer is
begin
-- If multiple fields are set (undefined), match existing
-- hardware by returning the first one.
for i in 0 to 7 loop
-- Big endian bit numbering
if fxm(7-i) = '1' then
return i;
end if;
end loop;

-- If no fields are set (undefined), also match existing
-- hardware by returning cr7.
return 7;
end;
-- If no fields are set (undefined), also match existing
-- hardware by returning cr7.
return 7;
end;

function num_to_fxm(num: integer) return std_ulogic_vector is
begin
case num is
when 0 =>
return "10000000";
when 1 =>
return "01000000";
when 2 =>
return "00100000";
when 3 =>
return "00010000";
when 4 =>
return "00001000";
when 5 =>
return "00000100";
when 6 =>
return "00000010";
when 7 =>
return "00000001";
when others =>
return "00000000";
end case;
end;
function num_to_fxm(num: integer) return std_ulogic_vector is
begin
case num is
when 0 =>
return "10000000";
when 1 =>
return "01000000";
when 2 =>
return "00100000";
when 3 =>
return "00010000";
when 4 =>
return "00001000";
when 5 =>
return "00000100";
when 6 =>
return "00000010";
when 7 =>
return "00000001";
when others =>
return "00000000";
end case;
end;

-- function from_crfile(cr: crfile) return std_ulogic_vector is
-- variable combined_cr : std_ulogic_vector(31 downto 0) := (others => '0');
-- variable high, low: integer range 0 to 31 := 0;
-- begin
-- for i in 0 to cr'length-1 loop
-- low := 4*(7-i);
-- high := low+3;
-- combined_cr(high downto low) := cr(i);
-- end loop;
--
-- return combined_cr;
-- end function;
--
-- function extract_one_crfield(cr: crfile; fxm: std_ulogic_vector(7 downto 0)) return std_ulogic_vector is
-- variable combined_cr : std_ulogic_vector(63 downto 0) := (others => '0');
-- variable crnum: integer range 0 to 7 := 0;
-- begin
-- crnum := fxm_to_num(fxm);
--
-- -- Vivado doesn't support non constant vector slice
-- -- low := 4*(7-crnum);
-- -- high := low+3;
-- -- combined_cr(high downto low) := cr(crnum);
-- case_0: case crnum is
-- when 0 =>
-- combined_cr(31 downto 28) := cr(0);
-- when 1 =>
-- combined_cr(27 downto 24) := cr(1);
-- when 2 =>
-- combined_cr(23 downto 20) := cr(2);
-- when 3 =>
-- combined_cr(19 downto 16) := cr(3);
-- when 4 =>
-- combined_cr(15 downto 12) := cr(4);
-- when 5 =>
-- combined_cr(11 downto 8) := cr(5);
-- when 6 =>
-- combined_cr(7 downto 4) := cr(6);
-- when 7 =>
-- combined_cr(3 downto 0) := cr(7);
-- end case;
--
-- return combined_cr;
-- end;
--
-- function insert_multiple_crfields(cr_in: crfile; rs: std_ulogic_vector(63 downto 0); fxm: std_ulogic_vector(7 downto 0)) return crfile is
-- variable cr : crfile;
-- variable combined_cr : std_ulogic_vector(63 downto 0) := (others => '0');
-- variable high, low: integer range 0 to 31 := 0;
-- begin
-- cr := cr_in;
--
-- for i in 0 to 7 loop
-- -- BE bit numbering
-- if fxm(7-i) = '1' then
-- low := 4*(7-i);
-- high := low+3;
-- cr(i) := rs(high downto low);
-- end if;
-- end loop;
--
-- return cr;
-- end;
--
-- function insert_one_crfield(cr_in: crfile; rs: std_ulogic_vector(63 downto 0); fxm: std_ulogic_vector(7 downto 0)) return crfile is
-- variable cr : crfile;
-- variable crnum: integer range 0 to 7 := 0;
-- variable high, low: integer range 0 to 31 := 0;
-- begin
-- cr := cr_in;
-- crnum := fxm_to_num(fxm);
-- low := 4*(7-crnum);
-- high := low+3;
-- cr(crnum) := rs(high downto low);
-- return cr;
-- end;
end package body crhelpers;

Write Preview
Loading…
Cancel
Save