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- added Cop instructions COP0 32, COP0 33, COP 34, COP0 35:

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ICACHE_invalidate_at, ICACHE_invalidate_all,
   DCACHE_invalidate_at, DCACHE_invalidate_all.

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git-svn-id: http://moon:8086/svn/vhdl/trunk@412 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-03-28 18:24:35 +00:00
parent 2761d5926b
commit 7892b38128
1 changed files with 32 additions and 1 deletions
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lib/CPUs/MIPS/src/core/mips_cop.vhd
+32 -1
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@@ -78,6 +78,7 @@ architecture Behavioral of cop is
type cop_pipe_t is record
opc : opcode_t;
CO : std_logic;
reg_ptr : reg_ptr_t;
rs : reg_ptr_t;
rd : reg_ptr_t;
@@ -116,6 +117,7 @@ begin
cop_pipe_ID.rd <= extract_rd(ir);
cop_pipe_ID.rt <= extract_rt(ir);
cop_pipe_ID.func <= extract_func(ir);
cop_pipe_ID.CO <= ir(25);
cop_pipe_ID.re <= cop_pipe_ID.cs when (cop_pipe_ID.opc = "111000" or cop_pipe_ID.rs = "00000") else '0';
cop_pipe_ID.we <= cop_pipe_ID.cs when (cop_pipe_ID.opc = "110000" or cop_pipe_ID.rs = "00100") else '0';
cop_EX_en <= exc_enable and not status_save;
@@ -263,6 +265,35 @@ cop_exception_map:
status_rest <= exception_end and ctrl_in.exc_left;
ctrl_out.icache.inv_addr <= test_reg;
ctrl_out.dcache.inv_addr <= test_reg;
cop_cache_op:
process(clk)
begin
if rising_edge(clk) then
ctrl_out.icache.inv_at <= '0';
ctrl_out.icache.inv_all <= '0';
ctrl_out.dcache.inv_at <= '0';
ctrl_out.dcache.inv_all <= '0';
if cop_pipe_ID.cs = '1' and cop_pipe_ID.CO = '1' then
case cop_pipe_ID.func is
when "100000" =>
ctrl_out.icache.inv_all <= '1';
when "100001" =>
ctrl_out.icache.inv_at <= '1';
when "100010" =>
ctrl_out.dcache.inv_all <= '1';
when "100011" =>
ctrl_out.dcache.inv_at <= '1';
when others => null;
end case;
end if;
end if;
end process;
cop_status_restore:
process(clk)
begin
@@ -271,7 +302,7 @@ cop_status_restore:
exception_end <= '0';
ctrl_out.exc_exit <= '0';
else
if cop_pipe_ID.func = "10000" and exception_end = '0' then -- RFE
if cop_pipe_ID.CO = '1' and cop_pipe_ID.func = "010000" and exception_end = '0' then -- RFE
exception_end <= cop_pipe_ID.cs;
ctrl_out.exc_exit <= cop_pipe_ID.cs;
elsif exception_end = '1' and ctrl_in.exc_left = '1' then