mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-22 12:33:29 +00:00
144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
//
|
|
// Logical.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 08/11/2023.
|
|
// Copyright © 2023 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "../AccessType.hpp"
|
|
|
|
namespace InstructionSet::x86::Primitive {
|
|
|
|
template <typename IntT, typename ContextT>
|
|
void and_(
|
|
modify_t<IntT> destination,
|
|
read_t<IntT> source,
|
|
ContextT &context
|
|
) {
|
|
/*
|
|
DEST ← DEST AND SRC;
|
|
*/
|
|
/*
|
|
The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
|
|
The state of the AF flag is undefined.
|
|
*/
|
|
destination &= source;
|
|
|
|
context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
|
|
context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
|
|
}
|
|
|
|
template <typename IntT, typename ContextT>
|
|
void or_(
|
|
modify_t<IntT> destination,
|
|
read_t<IntT> source,
|
|
ContextT &context
|
|
) {
|
|
/*
|
|
DEST ← DEST OR SRC;
|
|
*/
|
|
/*
|
|
The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
|
|
The state of the AF flag is undefined.
|
|
*/
|
|
destination |= source;
|
|
|
|
context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
|
|
context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
|
|
}
|
|
|
|
template <typename IntT, typename ContextT>
|
|
void xor_(
|
|
modify_t<IntT> destination,
|
|
read_t<IntT> source,
|
|
ContextT &context
|
|
) {
|
|
/*
|
|
DEST ← DEST XOR SRC;
|
|
*/
|
|
/*
|
|
The OF and CF flags are cleared; the SF, ZF, and PF flags are set according to the result.
|
|
The state of the AF flag is undefined.
|
|
*/
|
|
destination ^= source;
|
|
|
|
context.flags.template set_from<Flag::Overflow, Flag::Carry>(0);
|
|
context.flags.template set_from<IntT, Flag::Zero, Flag::Sign, Flag::ParityOdd>(destination);
|
|
}
|
|
|
|
template <typename IntT>
|
|
void not_(
|
|
modify_t<IntT> destination
|
|
) {
|
|
/*
|
|
DEST ← NOT DEST;
|
|
*/
|
|
/*
|
|
Flags affected: none.
|
|
*/
|
|
destination = ~destination;
|
|
}
|
|
|
|
template <typename IntT>
|
|
void cbw(
|
|
IntT &ax
|
|
) {
|
|
constexpr IntT test_bit = 1 << (sizeof(IntT) * 4 - 1);
|
|
constexpr IntT low_half = (1 << (sizeof(IntT) * 4)) - 1;
|
|
|
|
if(ax & test_bit) {
|
|
ax |= ~low_half;
|
|
} else {
|
|
ax &= low_half;
|
|
}
|
|
}
|
|
|
|
template <typename IntT>
|
|
void cwd(
|
|
IntT &dx,
|
|
IntT ax
|
|
) {
|
|
dx = ax & Numeric::top_bit<IntT>() ? IntT(~0) : IntT(0);
|
|
}
|
|
|
|
// TODO: changes to the interrupt flag do quite a lot more in protected mode.
|
|
template <typename ContextT>
|
|
void clc(ContextT &context) { context.flags.template set_from<Flag::Carry>(0); }
|
|
template <typename ContextT>
|
|
void cld(ContextT &context) { context.flags.template set_from<Flag::Direction>(0); }
|
|
template <typename ContextT>
|
|
void cli(ContextT &context) { context.flags.template set_from<Flag::Interrupt>(0); }
|
|
template <typename ContextT>
|
|
void stc(ContextT &context) { context.flags.template set_from<Flag::Carry>(1); }
|
|
template <typename ContextT>
|
|
void std(ContextT &context) { context.flags.template set_from<Flag::Direction>(1); }
|
|
template <typename ContextT>
|
|
void sti(ContextT &context) { context.flags.template set_from<Flag::Interrupt>(1); }
|
|
template <typename ContextT>
|
|
void cmc(ContextT &context) {
|
|
context.flags.template set_from<Flag::Carry>(!context.flags.template flag<Flag::Carry>());
|
|
}
|
|
|
|
template <typename ContextT>
|
|
void salc(
|
|
uint8_t &al,
|
|
ContextT &context
|
|
) {
|
|
al = context.flags.template flag<Flag::Carry>() ? 0xff : 0x00;
|
|
}
|
|
|
|
template <typename IntT, typename ContextT>
|
|
void setmo(
|
|
write_t<IntT> destination,
|
|
ContextT &context
|
|
) {
|
|
const auto result = destination = IntT(~0);
|
|
context.flags.template set_from<Flag::Carry, Flag::AuxiliaryCarry, Flag::Overflow>(0);
|
|
context.flags.template set_from<IntT, Flag::Sign, Flag::Zero, Flag::ParityOdd>(result);
|
|
}
|
|
|
|
}
|