86 lines
1.5 KiB
C++
86 lines
1.5 KiB
C++
/*!
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\file M_extension.h
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\brief Implement M extensions part of the RISC-V
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\author Màrius Montón
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\date November 2018
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*/
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// SPDX-License-Identifier: GPL-3.0-or-later
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#ifndef M_EXTENSION__H
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#define M_EXTENSION__H
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#include "systemc"
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#include "extension_base.h"
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#include "Registers.h"
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typedef enum {
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OP_M_MUL,
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OP_M_MULH,
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OP_M_MULHSU,
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OP_M_MULHU,
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OP_M_DIV,
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OP_M_DIVU,
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OP_M_REM,
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OP_M_REMU,
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OP_M_ERROR
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} op_M_Codes;
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typedef enum {
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M_MUL = 0b000,
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M_MULH = 0b001,
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M_MULHSU = 0b010,
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M_MULHU = 0b011,
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M_DIV = 0b100,
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M_DIVU = 0b101,
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M_REM = 0b110,
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M_REMU = 0b111,
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} M_Codes;
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/**
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* @brief Instruction decoding and fields access
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*/
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class M_extension: public extension_base {
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public:
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/**
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* @brief Constructor, same as base clase
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*/
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using extension_base::extension_base;
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/**
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* @brief Decodes opcode of instruction
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* @return opcode of instruction
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*/
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op_M_Codes decode() const;
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inline void dump() const override {
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std::cout << std::hex << "0x" << m_instr << std::dec << std::endl;
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}
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bool Exec_M_MUL() const;
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bool Exec_M_MULH() const;
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bool Exec_M_MULHSU() const;
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bool Exec_M_MULHU() const;
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bool Exec_M_DIV() const;
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bool Exec_M_DIVU() const;
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bool Exec_M_REM() const;
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bool Exec_M_REMU() const;
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bool process_instruction(Instruction &inst);
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private:
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/**
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* @brief Access to opcode field
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* @return return opcode field
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*/
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inline std::int32_t opcode() const override {
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return static_cast<std::int32_t>(m_instr.range(14, 12));
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}
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};
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#endif
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