mirror of
https://github.com/Gehstock/Mist_FPGA.git
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72 lines
2.6 KiB
Plaintext
72 lines
2.6 KiB
Plaintext
// Copyright Jamie Iles, 2017
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//
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// This file is part of s80x86.
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//
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// s80x86 is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// s80x86 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with s80x86. If not, see <http://www.gnu.org/licenses/>.
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.at 0xa4;
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jmp movsb;
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.auto_address;
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movsb:
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ra_sel SI, rb_cl, jmp_if_not_rep movsb_no_rep;
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movsb_rep_loop:
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ra_sel CX, jmp_rb_zero movsb_done;
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ra_sel SI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,
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rd_sel_source MICROCODE_RD_SEL, rd_sel CX;
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movsb_no_rep:
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a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, ra_sel SI, segment DS;
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width W8, segment DS, mem_read;
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ra_sel DI, a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,
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rd_sel_source MICROCODE_RD_SEL, rd_sel SI;
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ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write,
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segment ES, segment_force;
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width W8, segment ES, segment_force, mem_write,
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jmp_if_not_rep movsb_done_no_rep;
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a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,
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rd_sel_source MICROCODE_RD_SEL, rd_sel DI, rb_cl, ext_int_yield,
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jmp movsb_rep_loop;
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movsb_done:
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next_instruction;
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movsb_done_no_rep:
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a_sel MAR, b_sel IMMEDIATE, immediate 0x1, alu_op NEXT,
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rd_sel_source MICROCODE_RD_SEL, rd_sel DI, next_instruction;
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.at 0xa5;
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jmp movsw;
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.auto_address;
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movsw:
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ra_sel SI, rb_cl, jmp_if_not_rep movsw_no_rep;
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movsw_rep_loop:
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ra_sel CX, jmp_rb_zero movsw_done;
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ra_sel SI, a_sel RA, b_sel IMMEDIATE, immediate 0x1, alu_op SUB,
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rd_sel_source MICROCODE_RD_SEL, rd_sel CX;
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movsw_no_rep:
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a_sel RA, alu_op SELA, mar_wr_sel Q, mar_write, ra_sel SI;
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a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,
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rd_sel_source MICROCODE_RD_SEL, rd_sel SI,
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segment DS;
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segment DS, mem_read, ra_sel DI, a_sel RA, alu_op SELA, mar_wr_sel Q,
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mar_write;
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a_sel RA, b_sel IMMEDIATE, immediate 0x2, alu_op NEXT,
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rd_sel_source MICROCODE_RD_SEL, rd_sel DI,
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segment ES, segment_force;
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segment ES, segment_force, mem_write, jmp_if_not_rep movsw_done;
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rb_cl, ext_int_yield, jmp movsw_rep_loop;
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movsw_done:
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next_instruction;
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