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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 COP0STATE_H
#define COP0STATE_H
#include <QObject>
#include <QString>
#include <cstdint>
#include <machinedefs.h>
namespace machine {
class Core;
class Cop0State : public QObject {
Q_OBJECT
friend class Core;
public:
enum Cop0Registers {
Unsupported = 0,
UserLocal,
BadVAddr, // Reports the address for the most recent address-related exception
Count, // Processor cycle count
Compare, // Timer interrupt control
Status, // Processor status and control
Cause, // Cause of last exception
EPC, // Program counter at last exception
EBase, // Exception vector base register
Config, // Configuration registers
COP0REGS_CNT,
};
enum StatusReg {
Status_IE = 0x00000001,
Status_EXL = 0x00000002,
Status_ERL = 0x00000004,
Status_IntMask = 0x0000ff00,
Status_Int0 = 0x00000100,
};
Cop0State(Core *core = nullptr);
Cop0State(const Cop0State&);
std::uint32_t read_cop0reg(enum Cop0Registers reg) const;
std::uint32_t read_cop0reg(std::uint8_t rd, std::uint8_t sel) const; // Read coprocessor 0 register
void write_cop0reg(enum Cop0Registers reg, std::uint32_t value);
void write_cop0reg(std::uint8_t reg, std::uint8_t sel, std::uint32_t value); // Write coprocessor 0 register
static QString cop0reg_name(enum Cop0Registers reg);
bool operator ==(const Cop0State &c) const;
bool operator !=(const Cop0State &c) const;
void reset(); // Reset all values to zero
bool core_interrupt_request();
std::uint32_t exception_pc_address();
signals:
void cop0reg_update(enum Cop0Registers reg, std::uint32_t val);
public slots:
void set_interrupt_signal(uint irq_num, bool active);
void set_status_exl(bool value);
protected:
void setup_core(Core *core);
void update_execption_cause(enum ExceptionCause excause, bool in_delay_slot);
void update_count_and_compare_irq();
private:
typedef std::uint32_t (Cop0State::*reg_read_t)
(enum Cop0Registers reg) const;
typedef void (Cop0State::*reg_write_t)
(enum Cop0Registers reg, std::uint32_t value);
struct cop0reg_desc_t {
const char *name;
std::uint32_t write_mask;
std::uint32_t init_value;
reg_read_t reg_read;
reg_write_t reg_write;
};
static const cop0reg_desc_t cop0reg_desc[COP0REGS_CNT];
std::uint32_t read_cop0reg_default(enum Cop0Registers reg) const;
void write_cop0reg_default(enum Cop0Registers reg, std::uint32_t value);
void write_cop0reg_count_compare(enum Cop0Registers reg, std::uint32_t value);
void write_cop0reg_user_local(enum Cop0Registers reg, std::uint32_t value);
Core *core;
std::uint32_t cop0reg[COP0REGS_CNT]; // coprocessor 0 registers
std::uint32_t last_core_cycles;
};
}
Q_DECLARE_METATYPE(machine::Cop0State)
Q_DECLARE_METATYPE(machine::Cop0State::Cop0Registers)
#endif // COP0STATE_H
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