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116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
//
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// MemorySlotHandler.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 12/01/2023.
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// Copyright © 2023 Thomas Harte. All rights reserved.
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//
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#include "MemorySlotHandler.hpp"
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#include <cassert>
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using namespace MSX;
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PrimarySlot::PrimarySlot(MemorySlotChangeHandler &handler) :
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subslots_{handler, handler, handler, handler} {}
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MemorySlot::MemorySlot(MemorySlotChangeHandler &handler) : handler_(handler) {
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unmap(0x0000, 0x10000);
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}
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void PrimarySlot::set_secondary_paging(uint8_t value) {
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secondary_paging_ = value;
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}
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uint8_t PrimarySlot::secondary_paging() const {
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return secondary_paging_;
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}
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const uint8_t *PrimarySlot::read_pointer(int segment) const {
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const int subslot = (secondary_paging_ >> (segment & ~1)) & 3;
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return subslots_[subslot].read_pointer(segment);
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}
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uint8_t *PrimarySlot::write_pointer(int segment) const {
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const int subslot = (secondary_paging_ >> (segment & ~1)) & 3;
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return subslots_[subslot].write_pointer(segment);
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}
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const uint8_t *MemorySlot::read_pointer(int segment) const {
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return read_pointers_[segment];
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}
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uint8_t *MemorySlot::write_pointer(int segment) const {
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return write_pointers_[segment];
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}
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void MemorySlot::set_source(const std::vector<uint8_t> &source) {
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source_ = source;
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}
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void MemorySlot::resize_source(std::size_t size) {
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source_.resize(size);
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}
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std::vector<uint8_t> &MemorySlot::source() {
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return source_;
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}
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const std::vector<uint8_t> &MemorySlot::source() const {
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return source_;
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}
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template <MSX::MemorySlot::AccessType type>
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void MemorySlot::map(std::size_t source_address, uint16_t destination_address, std::size_t length) {
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assert(!(destination_address & 8191));
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assert(!(length & 8191));
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assert(size_t(destination_address) + length <= 65536);
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for(std::size_t c = 0; c < (length >> 13); ++c) {
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source_address %= source_.size();
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const int bank = int((destination_address >> 13) + c);
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read_pointers_[bank] = &source_[source_address];
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if constexpr (type == AccessType::ReadWrite) {
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write_pointers_[bank] = read_pointers_[bank];
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}
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source_address += 8192;
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}
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handler_.did_page();
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}
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void MemorySlot::map_handler(uint16_t destination_address, std::size_t length) {
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assert(!(destination_address & 8191));
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assert(!(length & 8191));
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assert(size_t(destination_address) + length <= 65536);
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for(std::size_t c = 0; c < (length >> 13); ++c) {
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read_pointers_[(destination_address >> 13) + c] = nullptr;
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}
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handler_.did_page();
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}
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void MemorySlot::unmap(uint16_t destination_address, std::size_t length) {
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assert(!(destination_address & 8191));
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assert(!(length & 8191));
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assert(size_t(destination_address) + length <= 65536);
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for(std::size_t c = 0; c < (length >> 13); ++c) {
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read_pointers_[(destination_address >> 13) + c] = unmapped.data();
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write_pointers_[(destination_address >> 13) + c] = scratch.data();
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}
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handler_.did_page();
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}
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MemorySlot &PrimarySlot::subslot(int slot) {
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return subslots_[slot];
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}
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template void MemorySlot::map<MSX::MemorySlot::AccessType::Read>(std::size_t source_address, uint16_t destination_address, std::size_t length);
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template void MemorySlot::map<MSX::MemorySlot::AccessType::ReadWrite>(std::size_t source_address, uint16_t destination_address, std::size_t length);
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