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105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
//
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// Z80.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/05/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Z80_hpp
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#define Z80_hpp
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#include <cstdint>
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namespace Z80 {
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/*
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The list of registers that can be accessed via @c set_value_of_register and @c set_value_of_register.
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*/
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enum Register {
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ProgramCounter,
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StackPointer,
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A, Flags, AF,
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B, C, BC,
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D, E, DE,
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H, L, HL,
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ADash, FlagsDash, AFDash,
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BDash, CDash, BCDash,
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DDash, EDash, DEDash,
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HDash, LDash, HLDash,
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IXh, IXl, IX,
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IYh, IYl, IY,
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R, I,
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};
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/*
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Flags as defined on the Z80; can be used to decode the result of @c get_flags or to form a value for @c set_flags.
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*/
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enum Flag: uint8_t {
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Sign = 0x80,
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Zero = 0x40,
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Bit5 = 0x20,
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HalfCarry = 0x10,
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Bit3 = 0x08,
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Parity = 0x04,
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Overflow = 0x04,
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Subtract = 0x02,
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Carry = 0x01
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};
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/*!
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Subclasses will be given the task of performing bus operations, allowing them to provide whatever interface they like
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between a Z80 and the rest of the system. @c BusOperation lists the types of bus operation that may be requested.
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@c None is reserved for internal use. It will never be requested from a subclass.
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*/
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enum BusOperation {
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ReadOpcode,
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Read, Write,
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Input, Output,
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Interrupt,
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BusRequest, BusAcknowledge,
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None
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};
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/*!
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@abstact An abstract base class for emulation of a 6502 processor via the curiously recurring template pattern/f-bounded polymorphism.
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@discussion Subclasses should implement @c perform_bus_operation(BusOperation operation, uint16_t address, uint8_t *value) in
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order to provide the bus on which the 6502 operates and @c synchronise(), which is called upon completion of a continuous run
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of cycles to allow a subclass to bring any on-demand activities up to date.
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Additional functionality can be provided by the host machine by providing a jam handler and inserting jam opcodes where appropriate;
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that will cause call outs when the program counter reaches those addresses. @c return_from_subroutine can be used to exit from a
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jammed state.
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*/
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template <class T> class Processor {
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private:
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struct MicroOp {
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enum {
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} type;
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void *source;
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void *destination;
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};
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union RegisterPair {
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uint16_t full;
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struct {
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uint8_t low, high;
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} bytes;
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};
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RegisterPair bc_, de_, hl_, afDash_, bcDash_, hlDash_, ix_, iy_;
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uint8_t a, i, r;
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const MicroOp *scheduled_programs_[4];
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unsigned int schedule_programs_write_pointer_, schedule_programs_read_pointer_, schedule_program_program_counter_;
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};
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}
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#endif /* Z80_hpp */
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