mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 08:49:37 +00:00
52 lines
1.0 KiB
C++
52 lines
1.0 KiB
C++
//
|
|
// Decoder.hpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 30/12/20.
|
|
// Copyright © 2020 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#pragma once
|
|
|
|
#include "Instruction.hpp"
|
|
|
|
namespace InstructionSet::PowerPC {
|
|
|
|
enum class Model {
|
|
/// i.e. 32-bit, with POWER carry-over instructions.
|
|
MPC601,
|
|
/// i.e. 32-bit, no POWER instructions.
|
|
MPC603,
|
|
/// i.e. 64-bit.
|
|
MPC620,
|
|
};
|
|
|
|
constexpr bool is64bit(Model model) {
|
|
return model == Model::MPC620;
|
|
}
|
|
|
|
constexpr bool is32bit(Model model) {
|
|
return !is64bit(model);
|
|
}
|
|
|
|
constexpr bool is601(Model model) {
|
|
return model == Model::MPC601;
|
|
}
|
|
|
|
/*!
|
|
Implements PowerPC instruction decoding.
|
|
|
|
@c model Indicates the instruction set to decode.
|
|
|
|
@c validate_reserved_bits If set to @c true, check that all
|
|
reserved bits are 0 or 1 as required and produce an invalid opcode if not.
|
|
Otherwise does no inspection of reserved bits.
|
|
|
|
TODO: determine what specific models of PowerPC do re: reserved bits.
|
|
*/
|
|
template <Model model, bool validate_reserved_bits = false> struct Decoder {
|
|
Instruction decode(uint32_t opcode);
|
|
};
|
|
|
|
}
|