mirror of
https://github.com/TomHarte/CLK.git
synced 2024-07-04 18:29:40 +00:00
81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
//
|
|
// LoadStore.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 08/11/2023.
|
|
// Copyright © 2023 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "../AccessType.hpp"
|
|
|
|
#include <utility>
|
|
|
|
namespace InstructionSet::x86::Primitive {
|
|
|
|
template <typename IntT>
|
|
void xchg(
|
|
modify_t<IntT> destination,
|
|
modify_t<IntT> source
|
|
) {
|
|
/*
|
|
TEMP ← DEST
|
|
DEST ← SRC
|
|
SRC ← TEMP
|
|
*/
|
|
std::swap(destination, source);
|
|
}
|
|
|
|
template <Source selector, typename InstructionT, typename ContextT>
|
|
void ld(
|
|
const InstructionT &instruction,
|
|
write_t<uint16_t> destination,
|
|
ContextT &context
|
|
) {
|
|
const auto pointer = instruction.source();
|
|
uint16_t source_address = uint16_t(address<uint16_t, AccessType::Read>(instruction, pointer, context));
|
|
const Source source_segment = instruction.data_segment();
|
|
|
|
context.memory.preauthorise_read(source_segment, source_address, 4);
|
|
destination = context.memory.template access<uint16_t, AccessType::PreauthorisedRead>(source_segment, source_address);
|
|
source_address += 2;
|
|
switch(selector) {
|
|
case Source::DS: context.registers.ds() = context.memory.template access<uint16_t, AccessType::PreauthorisedRead>(source_segment, source_address); break;
|
|
case Source::ES: context.registers.es() = context.memory.template access<uint16_t, AccessType::PreauthorisedRead>(source_segment, source_address); break;
|
|
}
|
|
}
|
|
|
|
template <typename IntT, typename InstructionT, typename ContextT>
|
|
void lea(
|
|
const InstructionT &instruction,
|
|
write_t<IntT> destination,
|
|
ContextT &context
|
|
) {
|
|
// TODO: address size.
|
|
destination = IntT(address<uint16_t, AccessType::Read>(instruction, instruction.source(), context));
|
|
}
|
|
|
|
template <typename AddressT, typename InstructionT, typename ContextT>
|
|
void xlat(
|
|
const InstructionT &instruction,
|
|
ContextT &context
|
|
) {
|
|
AddressT address;
|
|
if constexpr (std::is_same_v<AddressT, uint16_t>) {
|
|
address = context.registers.bx() + context.registers.al();
|
|
}
|
|
|
|
context.registers.al() = context.memory.template access<uint8_t, AccessType::Read>(instruction.data_segment(), address);
|
|
}
|
|
|
|
template <typename IntT>
|
|
void mov(
|
|
write_t<IntT> destination,
|
|
read_t<IntT> source
|
|
) {
|
|
destination = source;
|
|
}
|
|
|
|
}
|