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 0xa6;

    jmp cmpsb;

.auto_address;

cmpsb:

    ra_sel DI, rb_cl, jmp_if_not_rep cmpsb_no_rep;

cmpsb_rep_loop:

    ra_sel CX, jmp_rb_zero cmpsb_done;

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

        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;

cmpsb_no_rep:

    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_read,

        a_sel MDR, alu_op SELA, tmp_wr_en;

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

        rd_sel_source MICROCODE_RD_SEL, rd_sel DI,

        ra_sel SI;

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

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

        rd_sel_source MICROCODE_RD_SEL, rd_sel SI,

        segment DS;

    width W8, segment DS, mem_read;

    width W8, a_sel MDR, b_sel TEMP, alu_op SUB,

        update_flags OF SF ZF CF PF AF, jmp_if_not_rep cmpsb_done;

    rb_cl, alu_op GETFLAGS, ext_int_yield,

        jmp_if_rep_not_complete cmpsb_rep_loop;

cmpsb_done:

    next_instruction;

.at 0xa7;

    jmp cmpsw;

.auto_address;

cmpsw:

    ra_sel DI, rb_cl, jmp_if_not_rep cmpsw_no_rep;

cmpsw_rep_loop:

    ra_sel CX, jmp_rb_zero cmpsw_done;

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

        rd_sel_source MICROCODE_RD_SEL, rd_sel CX;

cmpsw_no_rep:

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

        segment_force;

    segment ES, segment_force, mem_read, a_sel MDR, alu_op SELA, tmp_wr_en,

        ra_sel DI;

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

        rd_sel_source MICROCODE_RD_SEL, rd_sel DI,

        ra_sel SI;

    a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, segment DS, 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, a_sel MDR, b_sel TEMP, alu_op SUB,

        update_flags OF SF ZF CF PF AF, jmp_if_not_rep cmpsw_done;

    rb_cl, alu_op GETFLAGS, ext_int_yield,

        jmp_if_rep_not_complete cmpsw_rep_loop;

cmpsw_done:

    next_instruction;