Subversion Repositories ao486

`define CMD_io_allow    #AUTOGEN_NEXT_CMD

// glob_param_1[15:0] - IO address

//NOTE: CMDEX_IO_ALLOW_1 does not use port number in exe_buffer

`define CMDEX_io_allow_1        4'd0

`define CMDEX_io_allow_2        4'd1

`CMDEX_io_allow_1

`CMDEX_io_allow_2

RETURN();

wire rd_io_allow_1_fault;

wire rd_io_allow_2_fault;

assign rd_io_allow_1_fault =

    rd_cmd == `CMD_io_allow && rd_cmdex == `CMDEX_io_allow_1 &&

    (   ~(tr_cache_valid) ||

        (tr_cache[`DESC_BITS_TYPE] != `DESC_TSS_AVAIL_386 && tr_cache[`DESC_BITS_TYPE] != `DESC_TSS_BUSY_386) ||

        tr_limit < 32'd103

    );

assign rd_io_allow_2_fault =

    rd_cmd == `CMD_io_allow && rd_cmdex == `CMDEX_io_allow_2 &&

    ({ 16'd0, rd_memory_last[15:0] } + { 16'd0, 3'd0, glob_param_1[15:3] }) >= tr_limit;

assign rd_io_allow_fault = rd_io_allow_1_fault || rd_io_allow_2_fault;

IF(rd_cmd == `CMD_io_allow && rd_cmdex == `CMDEX_io_allow_1);

    SET(rd_system_linear, tr_base + 32'd102);

    IF(rd_io_allow_1_fault || rd_mutex_busy_active); SET(rd_waiting); // read only when last operation finished

    ELSE();

        // memory read saved to rd_memory_last

        SET(read_system_word);

        IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();

    ENDIF();

ENDIF();

IF(rd_cmd == `CMD_io_allow && rd_cmdex == `CMDEX_io_allow_2);

    SET(rd_system_linear, tr_base + { 16'd0, rd_memory_last[15:0] } + { 16'd0, 3'd0, glob_param_1[15:3] });

    IF(rd_io_allow_2_fault); SET(rd_waiting);

    ELSE();

        SET(rd_src_is_memory);

        SET(read_system_word);

        IF(~(read_for_rd_ready)); SET(rd_waiting); ENDIF();

    ENDIF();

ENDIF();

wire [3:0] e_io_allow_bits;

assign e_io_allow_bits =

    (glob_param_1[2:0] == 3'd0)?  src[3:0] :

    (glob_param_1[2:0] == 3'd1)?  src[4:1] :

    (glob_param_1[2:0] == 3'd2)?  src[5:2] :

    (glob_param_1[2:0] == 3'd3)?  src[6:3] :

    (glob_param_1[2:0] == 3'd4)?  src[7:4] :

    (glob_param_1[2:0] == 3'd5)?  src[8:5] :

    (glob_param_1[2:0] == 3'd6)?  src[9:6] :

                                src[10:7];

IF(exe_cmd == `CMD_io_allow && exe_cmdex == `CMDEX_io_allow_2);

    IF((  exe_is_8bit                       && e_io_allow_bits[0]   != 1'd0) ||

       (~(exe_is_8bit) && exe_operand_16bit && e_io_allow_bits[1:0] != 2'd0) ||

       (~(exe_is_8bit) && exe_operand_32bit && e_io_allow_bits[3:0] != 4'd0));

        SET(exe_waiting);

        SET(exe_trigger_gp_fault); //exception GP(0)

    ENDIF();

ENDIF();

IF(wr_cmd == `CMD_io_allow && (wr_cmdex == `CMDEX_io_allow_1 || wr_cmdex == `CMDEX_io_allow_2));

    SET(wr_not_finished);

ENDIF();