Remove sim_config instruction

It's not used any more, and it's not in the ISA.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

decode1.vhdl

@@ -345,7 +345,6 @@ architecture behaviour of decode1 is
         constant attn_instr    : decode_rom_t := (ALU,    OP_ATTN,      NONE,       NONE,        NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1');
 	constant nop_instr     : decode_rom_t := (ALU,    OP_NOP,       NONE,       NONE,        NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0');
 	constant sc_instr     :  decode_rom_t := (ALU,    OP_SC,        NONE,       NONE,        NONE, NONE, '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '0');
-        constant sim_cfg_instr : decode_rom_t := (ALU,    OP_SIM_CONFIG,NONE,       NONE,        NONE, RT,   '0', '0', '0', '0', ZERO, '0', NONE, '0', '0', '0', '0', '0', '0', NONE, '0', '1');
 
 begin
 	decode1_0: process(clk)
@@ -406,9 +405,6 @@ begin
                 elsif std_match(f_in.insn, "010001--------------0000000---1-") then
                         report "PPC_sc";
                         v.decode := sc_instr;
-                elsif std_match(f_in.insn, "000001---------------0000000011-") then
-                        report "PPC_SIM_CONFIG";
-                        v.decode := sim_cfg_instr;
                 elsif std_match(f_in.insn, "000000---------------0100000000-") then
                         report "PPC_attn";
                         v.decode := attn_instr;

decode_types.vhdl

@@ -17,7 +17,7 @@ package decode_types is
 			 OP_RLC, OP_RLCL, OP_RLCR, OP_SC, OP_SETB,
 			 OP_SHL, OP_SHR,
 			 OP_SYNC, OP_TRAP,
-			 OP_XOR, OP_SIM_CONFIG
+			 OP_XOR
 			 );
     type input_reg_a_t is (NONE, RA, RA_OR_ZERO, SPR);
     type input_reg_b_t is (NONE, RB, CONST_UI, CONST_SI, CONST_SI_HI, CONST_UI_HI, CONST_LI, CONST_BD, CONST_DS, CONST_M1, CONST_SH, CONST_SH32, SPR);

execute1.vhdl

@@ -743,11 +743,6 @@ begin
 		    set_carry(v.e, rotator_carry, rotator_carry);
 		end if;
 		result_en := '1';
-	    when OP_SIM_CONFIG =>
-		-- bit 0 was used to select the microwatt console, which
-		-- we no longer support.
-		result := x"0000000000000000";
-		result_en := '1';
 
 	    when OP_ISYNC =>
 		f_out.redirect <= '1';