mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-19 08:31:11 +00:00
152 lines
4.2 KiB
C++
152 lines
4.2 KiB
C++
//
|
|
// MemorySlotHandler.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 03/01/2018.
|
|
// Copyright 2018 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#ifndef MemorySlotHandler_hpp
|
|
#define MemorySlotHandler_hpp
|
|
|
|
#include "../../ClockReceiver/ClockReceiver.hpp"
|
|
#include "../../Analyser/Dynamic/ConfidenceCounter.hpp"
|
|
|
|
#include <array>
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
/*
|
|
Design assumptions:
|
|
|
|
- to-ROM writes and paging events are 'rare', so virtual call costs aren't worrisome;
|
|
- ROM type variety is sufficiently slender that most of it can be built into the MSX.
|
|
|
|
Part of the motivation is also that the MSX has four logical slots, the ROM, RAM plus two
|
|
things plugged in. So even if the base class were templated to remove the virtual call,
|
|
there'd just be a switch on what to call.
|
|
*/
|
|
namespace MSX {
|
|
|
|
struct MemorySlotChangeHandler {
|
|
virtual void did_page() = 0;
|
|
};
|
|
|
|
class MemorySlot {
|
|
public:
|
|
MemorySlot(MemorySlotChangeHandler &);
|
|
|
|
/// @returns A pointer to the area of memory currently underneath @c address that
|
|
/// should be read
|
|
const uint8_t *read_pointer(int segment) const;
|
|
|
|
/// @returns A pointer to the area of memory currently underneath @c address.
|
|
uint8_t *write_pointer(int segment) const;
|
|
|
|
/// Copies an underlying source buffer.
|
|
void set_source(const std::vector<uint8_t> &source);
|
|
|
|
/// Sets the size of the underlying source buffer.
|
|
void resize_source(std::size_t);
|
|
|
|
/// Provides a reference to the internal source storage.
|
|
std::vector<uint8_t> &source();
|
|
const std::vector<uint8_t> &source() const;
|
|
|
|
enum AccessType {
|
|
Read,
|
|
ReadWrite
|
|
};
|
|
|
|
/// Maps the content from @c source_address in the buffer previously
|
|
/// supplied to @c set_source to the region indicated by
|
|
/// @c destination_address and @c length within @c subslot.
|
|
template <AccessType type = AccessType::Read> void map(
|
|
std::size_t source_address,
|
|
uint16_t destination_address,
|
|
std::size_t length);
|
|
|
|
/// Marks the region indicated by @c destination_address and @c length
|
|
/// as requiring calls into this slot's MemorySlotHandler.
|
|
void map_handler(
|
|
uint16_t destination_address,
|
|
std::size_t length);
|
|
|
|
/// Marks the region indicated by @c destination_address and @c length
|
|
/// as unoccupied.
|
|
void unmap(
|
|
uint16_t destination_address,
|
|
std::size_t length);
|
|
|
|
private:
|
|
std::vector<uint8_t> source_;
|
|
uint8_t *read_pointers_[8];
|
|
uint8_t *write_pointers_[8];
|
|
|
|
MemorySlotChangeHandler &handler_;
|
|
|
|
using MemoryChunk = std::array<uint8_t, 8192>;
|
|
inline static MemoryChunk unmapped{0xff};
|
|
inline static MemoryChunk scratch;
|
|
};
|
|
|
|
class PrimarySlot {
|
|
public:
|
|
PrimarySlot(MemorySlotChangeHandler &);
|
|
|
|
/// @returns A pointer to the area of memory currently underneath @c address that
|
|
/// should be read
|
|
const uint8_t *read_pointer(int segment) const;
|
|
|
|
/// @returns A pointer to the area of memory currently underneath @c address.
|
|
uint8_t *write_pointer(int segment) const;
|
|
|
|
/// Attempts to write the argument as the secondary paging selection.
|
|
void set_secondary_paging(uint8_t);
|
|
|
|
/// @returns The value most recently provided to @c set_secondary_paging.
|
|
uint8_t secondary_paging() const;
|
|
|
|
/// Indicates whether this slot supports secondary paging.
|
|
bool supports_secondary_paging = false;
|
|
|
|
/// Provides the subslot at the specified index.
|
|
MemorySlot &subslot(int);
|
|
|
|
private:
|
|
MemorySlot subslots_[4];
|
|
uint8_t secondary_paging_ = 0;
|
|
};
|
|
|
|
class MemorySlotHandler {
|
|
public:
|
|
virtual ~MemorySlotHandler() {}
|
|
|
|
/*! Advances time by @c half_cycles. */
|
|
virtual void run_for([[maybe_unused]] HalfCycles half_cycles) {}
|
|
|
|
/*! Announces an attempt to write @c value to @c address. */
|
|
virtual void write(uint16_t address, uint8_t value, bool pc_is_outside_bios) = 0;
|
|
|
|
/*! Seeks the result of a read at @c address; this is used only if the area is unmapped. */
|
|
virtual uint8_t read([[maybe_unused]] uint16_t address) { return 0xff; }
|
|
|
|
/*! @returns The probability that this handler is correct for the data it owns. */
|
|
float get_confidence() {
|
|
return confidence_counter_.get_confidence();
|
|
}
|
|
|
|
virtual std::string debug_type() {
|
|
return "";
|
|
}
|
|
|
|
protected:
|
|
Analyser::Dynamic::ConfidenceCounter confidence_counter_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif /* MemorySlotHandler_hpp */
|