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https://github.com/Gehstock/Mist_FPGA.git
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71 lines
1.9 KiB
Plaintext
71 lines
1.9 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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// CLC
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.at 0xf8;
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b_sel IMMEDIATE, immediate 0x0, alu_op SETFLAGSB, update_flags CF,
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next_instruction;
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// STC
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.at 0xf9;
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b_sel IMMEDIATE, immediate 0xffff, alu_op SETFLAGSB, update_flags CF,
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next_instruction;
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// CLI
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.at 0xfa;
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b_sel IMMEDIATE, immediate 0x0, alu_op SETFLAGSB, update_flags IF,
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ext_int_inhibit, next_instruction;
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// STI
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.at 0xfb;
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b_sel IMMEDIATE, immediate 0xffff, alu_op SETFLAGSB, update_flags IF,
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ext_int_inhibit, next_instruction;
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// CLD
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.at 0xfc;
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b_sel IMMEDIATE, immediate 0x0, alu_op SETFLAGSB, update_flags DF,
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next_instruction;
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// STD
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.at 0xfd;
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b_sel IMMEDIATE, immediate 0xffff, alu_op SETFLAGSB, update_flags DF,
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next_instruction;
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// CMC
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.at 0xf5;
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alu_op CMC, update_flags CF, next_instruction;
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// LAHF
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.at 0x9f;
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alu_op GETFLAGS, rd_sel_source MICROCODE_RD_SEL, rd_sel AH,
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width W8, next_instruction;
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// SAHF
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.at 0x9e;
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ra_sel AH, width W8, jmp sahf;
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.auto_address;
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sahf:
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a_sel RA, alu_op SETFLAGSA, update_flags CF PF AF ZF SF, next_instruction;
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// SETALC
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.at 0xd6;
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ra_sel CX, rb_cl, jmp setalc;
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.auto_address;
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setalc:
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width W8, a_sel RA, b_sel RB, alu_op SBB,
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rd_sel_source MICROCODE_RD_SEL, rd_sel AL, next_instruction;
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