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147 lines
3.6 KiB
C++
147 lines
3.6 KiB
C++
//
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// Logical.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 08/11/2023.
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// Copyright © 2023 Thomas Harte. All rights reserved.
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//
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#ifndef Logical_h
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#define Logical_h
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#include "../AccessType.hpp"
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namespace InstructionSet::x86::Primitive {
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template <typename IntT, typename ContextT>
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void and_(
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modify_t<IntT> destination,
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read_t<IntT> source,
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ContextT &context
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) {
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/*
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DEST ← DEST AND SRC;
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*/
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/*
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The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
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The state of the AF flag is undefined.
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*/
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destination &= source;
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context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
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context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
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}
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template <typename IntT, typename ContextT>
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void or_(
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modify_t<IntT> destination,
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read_t<IntT> source,
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ContextT &context
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) {
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/*
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DEST ← DEST OR SRC;
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*/
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/*
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The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
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The state of the AF flag is undefined.
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*/
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destination |= source;
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context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
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context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
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}
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template <typename IntT, typename ContextT>
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void xor_(
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modify_t<IntT> destination,
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read_t<IntT> source,
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ContextT &context
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) {
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/*
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DEST ← DEST XOR SRC;
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*/
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/*
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The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
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The state of the AF flag is undefined.
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*/
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destination ^= source;
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context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
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context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
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}
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template <typename IntT>
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void not_(
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modify_t<IntT> destination
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) {
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/*
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DEST ← NOT DEST;
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*/
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/*
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Flags affected: none.
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*/
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destination = ~destination;
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}
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template <typename IntT>
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void cbw(
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IntT &ax
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) {
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constexpr IntT test_bit = 1 << (sizeof(IntT) * 4 - 1);
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constexpr IntT low_half = (1 << (sizeof(IntT) * 4)) - 1;
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if(ax & test_bit) {
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ax |= ~low_half;
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} else {
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ax &= low_half;
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}
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}
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template <typename IntT>
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void cwd(
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IntT &dx,
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IntT ax
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) {
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dx = ax & Numeric::top_bit<IntT>() ? IntT(~0) : IntT(0);
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}
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// TODO: changes to the interrupt flag do quite a lot more in protected mode.
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template <typename ContextT>
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void clc(ContextT &context) { context.flags.template set_from<Flag::Carry>(0); }
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template <typename ContextT>
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void cld(ContextT &context) { context.flags.template set_from<Flag::Direction>(0); }
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template <typename ContextT>
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void cli(ContextT &context) { context.flags.template set_from<Flag::Interrupt>(0); }
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template <typename ContextT>
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void stc(ContextT &context) { context.flags.template set_from<Flag::Carry>(1); }
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template <typename ContextT>
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void std(ContextT &context) { context.flags.template set_from<Flag::Direction>(1); }
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template <typename ContextT>
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void sti(ContextT &context) { context.flags.template set_from<Flag::Interrupt>(1); }
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template <typename ContextT>
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void cmc(ContextT &context) {
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context.flags.template set_from<Flag::Carry>(!context.flags.template flag<Flag::Carry>());
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}
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template <typename ContextT>
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void salc(
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uint8_t &al,
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ContextT &context
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) {
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al = context.flags.template flag<Flag::Carry>() ? 0xff : 0x00;
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}
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template <typename IntT, typename ContextT>
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void setmo(
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write_t<IntT> destination,
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ContextT &context
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) {
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const auto result = destination = ~0;
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context.flags.template set_from<Flag::Carry, Flag::AuxiliaryCarry, Flag::Overflow>(0);
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context.flags.template set_from<IntT, Flag::Sign, Flag::Zero, Flag::ParityOdd>(result);
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}
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}
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#endif /* Logical_h */
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