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// SPDX-License-Identifier: GPL-2.0+
/*******************************************************************************
* QtMips - MIPS 32-bit Architecture Subset Simulator
*
* Implemented to support following courses:
*
* B35APO - Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b35apo
*
* B4M35PAP - Advanced Computer Architectures
* https://cw.fel.cvut.cz/wiki/courses/b4m35pap/start
*
* Copyright (c) 2017-2019 Karel Koci<cynerd@email.cz>
* Copyright (c) 2019 Pavel Pisa <pisa@cmp.felk.cvut.cz>
*
* Faculty of Electrical Engineering (http://www.fel.cvut.cz)
* Czech Technical University (http://www.cvut.cz/)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
******************************************************************************/
#ifndef MEMORY_H
#define MEMORY_H
#include <QObject>
#include <cstdint>
#include <qtmipsexception.h>
#include "machinedefs.h"
namespace machine {
// Virtual class for common memory access
class MemoryAccess : public QObject {
Q_OBJECT
public:
// Note: hword and word methods are throwing away lowest bits so unaligned access is ignored without error.
bool write_byte(std::uint32_t offset, std::uint8_t value);
bool write_hword(std::uint32_t offset, std::uint16_t value);
bool write_word(std::uint32_t offset, std::uint32_t value);
std::uint8_t read_byte(std::uint32_t offset) const;
std::uint16_t read_hword(std::uint32_t offset) const;
std::uint32_t read_word(std::uint32_t offset) const;
void write_ctl(enum AccessControl ctl, std::uint32_t offset, std::uint32_t value);
std::uint32_t read_ctl(enum AccessControl ctl, std::uint32_t offset) const;
virtual void sync();
virtual enum LocationStatus location_status(std::uint32_t offset) const;
protected:
virtual bool wword(std::uint32_t offset, std::uint32_t value) = 0;
virtual std::uint32_t rword(std::uint32_t offset) const = 0;
private:
static int sh_nth(std::uint32_t offset);
};
class MemorySection : public MemoryAccess {
public:
MemorySection(std::uint32_t length);
MemorySection(const MemorySection&);
~MemorySection();
bool wword(std::uint32_t offset, std::uint32_t value);
std::uint32_t rword(std::uint32_t offset) const;
void merge(MemorySection&);
std::uint32_t length() const;
const std::uint32_t* data() const;
bool operator==(const MemorySection&) const;
bool operator!=(const MemorySection&) const;
private:
std::uint32_t len;
std::uint32_t *dt;
};
union MemoryTree {
union MemoryTree *mt;
MemorySection *sec;
};
class Memory : public MemoryAccess {
Q_OBJECT
public:
Memory();
Memory(const Memory&);
~Memory();
void reset(); // Reset whole content of memory (removes old tree and creates new one)
void reset(const Memory&);
MemorySection *get_section(std::uint32_t address, bool create) const; // returns section containing given address
bool wword(std::uint32_t address, std::uint32_t value);
std::uint32_t rword(std::uint32_t address) const;
bool operator==(const Memory&) const;
bool operator!=(const Memory&) const;
const union MemoryTree *get_memorytree_root() const;
inline std::uint32_t get_change_counter() const {
return change_counter;
}
private:
union MemoryTree *mt_root;
std::uint32_t change_counter;
std::uint32_t write_counter;
static union MemoryTree *allocate_section_tree();
static void free_section_tree(union MemoryTree*, size_t depth);
static bool compare_section_tree(const union MemoryTree*, const union MemoryTree*, size_t depth);
static bool is_zero_section_tree(const union MemoryTree*, size_t depth);
static union MemoryTree *copy_section_tree(const union MemoryTree*, size_t depth);
};
}
Q_DECLARE_METATYPE(machine::AccessControl)
Q_DECLARE_METATYPE(machine::Memory)
#endif // MEMORY_H
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