Subversion Repositories s80186

// Copyright Jamie Iles, 2017

//

// This file is part of s80x86.

//

// s80x86 is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// s80x86 is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with s80x86.  If not, see .

.at 0xa4;

    jmp movsb;

.auto_address;

movsb:

    ra_sel SI, rb_cl, jmp_if_not_rep movsb_no_rep;

movsb_rep_loop:

    ra_sel CX, jmp_rb_zero movsb_done;

    ra_sel SI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,

        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;

movsb_no_rep:

    a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, ra_sel SI, segment DS;

    width W8, segment DS, mem_read;

    ra_sel DI, a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,

        rd_sel_source MICROCODE_RD_SEL, rd_sel SI;

    ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write,

        segment ES, segment_force;

    width W8, segment ES, segment_force, mem_write,

        jmp_if_not_rep movsb_done_no_rep;

    a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,

        rd_sel_source MICROCODE_RD_SEL, rd_sel DI, rb_cl, ext_int_yield,

        jmp movsb_rep_loop;

movsb_done:

    next_instruction;

movsb_done_no_rep:

    a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,

        rd_sel_source MICROCODE_RD_SEL, rd_sel DI, next_instruction;

.at 0xa5;

    jmp movsw;

.auto_address;

movsw:

    ra_sel SI, rb_cl, jmp_if_not_rep movsw_no_rep;

movsw_rep_loop:

    ra_sel CX, jmp_rb_zero movsw_done;

    ra_sel SI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,

        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;

movsw_no_rep:

    a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, ra_sel SI;

    a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,

        rd_sel_source MICROCODE_RD_SEL, rd_sel SI,

        segment DS;

    segment DS, mem_read, ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q,

        mar_write;

    a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,

        rd_sel_source MICROCODE_RD_SEL, rd_sel DI,

        segment ES, segment_force;

    segment ES, segment_force, mem_write, jmp_if_not_rep movsw_done;

    rb_cl, ext_int_yield, jmp movsw_rep_loop;

movsw_done:

    next_instruction;