Subversion Repositories ao486

<defines>
`define CMD_LOOP        #AUTOGEN_NEXT_CMD

`define CMDEX_LOOP_NE               4'd0
`define CMDEX_LOOP_E                4'd1
`define CMDEX_LOOP                  4'd2
</defines>

<decode>
dec_ready_one_one && (decoder[7:0] == 8'hE0 || decoder[7:0] == 8'hE1 || decoder[7:0] == 8'hE2)
`CMD_LOOP
SET(dec_cmdex,
    (decoder[1:0] == 2'b00)? `CMDEX_LOOP_NE :
    (decoder[1:0] == 2'b01)? `CMDEX_LOOP_E :
                             `CMDEX_LOOP);
SET(dec_is_8bit);
SET(consume_one_one);
</decode>

<execute_local>
wire exe_cmd_loop_ecx;
wire exe_cmd_loop_condition;

assign exe_cmd_loop_ecx = (exe_address_16bit)? ecx[15:0] != 16'd1 : ecx != 32'd1;
    
assign exe_cmd_loop_condition =
    (exe_cmdex == `CMDEX_LOOP_NE)?  exe_cmd_loop_ecx && zflag == `FALSE :
    (exe_cmdex == `CMDEX_LOOP_E)?   exe_cmd_loop_ecx && zflag == `TRUE :
                                    exe_cmd_loop_ecx;
</execute_local>

<read>
IF(rd_cmd == `CMD_LOOP);
    SET(rd_req_ecx);
ENDIF();
</read>

<execute>
IF(exe_cmd == `CMD_LOOP);
    IF(exe_mutex_current[`MUTEX_ECX_BIT] || (exe_mutex_current[`MUTEX_EFLAGS_BIT] && (exe_cmdex == `CMDEX_LOOP_NE || exe_cmdex == `CMDEX_LOOP_E))); SET(exe_waiting);
    ELSE();
        IF(exe_cmd_loop_condition && exe_branch_eip > cs_limit);
            SET(exe_waiting);
            SET(exe_trigger_gp_fault); //exception GP(0)
        ENDIF();
        
        SET(exe_branch,         exe_cmd_loop_condition);
        SET(exe_result_signals, { 4'd0, exe_cmd_loop_condition });
    ENDIF();
ENDIF();
</execute>

<write_local>
wire [31:0] wr_ecx_minus_1;

assign wr_ecx_minus_1 = ecx - 32'd1;
</write_local>

<write>
IF(wr_cmd == `CMD_LOOP);
    IF(wr_address_16bit);   SAVE(ecx, { ecx[31:16], wr_ecx_minus_1[15:0] });
    ELSE();                 SAVE(ecx, wr_ecx_minus_1);
    ENDIF();
    
    IF(result_signals[0]);
        // clear pipeline
        SET(wr_req_reset_pr);
        SET(wr_req_reset_dec);
        SET(wr_req_reset_micro);
        SET(wr_req_reset_rd);
        SET(wr_req_reset_exe);
    ENDIF();
ENDIF();
</write>