1/* Copyright (c) 2013-2016 Jeffrey Pfau
  2 *
  3 * This Source Code Form is subject to the terms of the Mozilla Public
  4 * License, v. 2.0. If a copy of the MPL was not distributed with this
  5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  6#ifndef LR35902_H
  7#define LR35902_H
  8
  9#include <mgba-util/common.h>
 10
 11CXX_GUARD_START
 12
 13#include <mgba/core/cpu.h>
 14#include <mgba/internal/lr35902/isa-lr35902.h>
 15
 16struct LR35902Core;
 17
 18#pragma pack(push, 1)
 19union FlagRegister {
 20	struct {
 21#if defined(__POWERPC__) || defined(__PPC__)
 22		unsigned z : 1;
 23		unsigned n : 1;
 24		unsigned h : 1;
 25		unsigned c : 1;
 26		unsigned unused : 4;
 27#else
 28		unsigned unused : 4;
 29		unsigned c : 1;
 30		unsigned h : 1;
 31		unsigned n : 1;
 32		unsigned z : 1;
 33#endif
 34	};
 35
 36	uint8_t packed;
 37};
 38#pragma pack(pop)
 39
 40enum LR35902ExecutionState {
 41	LR35902_CORE_FETCH = 3,
 42	LR35902_CORE_IDLE_0 = 0,
 43	LR35902_CORE_IDLE_1 = 1,
 44	LR35902_CORE_EXECUTE = 2,
 45
 46	LR35902_CORE_MEMORY_LOAD = 7,
 47	LR35902_CORE_MEMORY_STORE = 11,
 48	LR35902_CORE_READ_PC = 15,
 49	LR35902_CORE_STALL = 19,
 50	LR35902_CORE_OP2 = 23
 51};
 52struct LR35902Memory {
 53	uint8_t (*cpuLoad8)(struct LR35902Core*, uint16_t address);
 54	uint8_t (*load8)(struct LR35902Core*, uint16_t address);
 55	void (*store8)(struct LR35902Core*, uint16_t address, int8_t value);
 56
 57	uint8_t* activeRegion;
 58	uint16_t activeMask;
 59	uint16_t activeRegionEnd;
 60	void (*setActiveRegion)(struct LR35902Core*, uint16_t address);
 61};
 62
 63struct LR35902InterruptHandler {
 64	void (*reset)(struct LR35902Core* cpu);
 65	void (*processEvents)(struct LR35902Core* cpu);
 66	void (*setInterrupts)(struct LR35902Core* cpu, bool enable);
 67	void (*halt)(struct LR35902Core* cpu);
 68	void (*stop)(struct LR35902Core* cpu);
 69
 70	void (*hitIllegal)(struct LR35902Core* cpu);
 71};
 72
 73struct LR35902Core {
 74#pragma pack(push, 1)
 75	union {
 76		struct {
 77			union FlagRegister f;
 78			uint8_t a;
 79		};
 80		uint16_t af;
 81	};
 82#pragma pack(pop)
 83	union {
 84		struct {
 85			uint8_t c;
 86			uint8_t b;
 87		};
 88		uint16_t bc;
 89	};
 90	union {
 91		struct {
 92			uint8_t e;
 93			uint8_t d;
 94		};
 95		uint16_t de;
 96	};
 97	union {
 98		struct {
 99			uint8_t l;
100			uint8_t h;
101		};
102		uint16_t hl;
103	};
104	uint16_t sp;
105	uint16_t pc;
106
107	uint16_t index;
108
109	int32_t cycles;
110	int32_t nextEvent;
111	enum LR35902ExecutionState executionState;
112	bool halted;
113
114	uint8_t bus;
115	bool condition;
116	LR35902Instruction instruction;
117
118	bool irqPending;
119	uint16_t irqVector;
120
121	struct LR35902Memory memory;
122	struct LR35902InterruptHandler irqh;
123
124	struct mCPUComponent* master;
125
126	size_t numComponents;
127	struct mCPUComponent** components;
128};
129
130void LR35902Init(struct LR35902Core* cpu);
131void LR35902Deinit(struct LR35902Core* cpu);
132void LR35902SetComponents(struct LR35902Core* cpu, struct mCPUComponent* master, int extra, struct mCPUComponent** extras);
133void LR35902HotplugAttach(struct LR35902Core* cpu, size_t slot);
134void LR35902HotplugDetach(struct LR35902Core* cpu, size_t slot);
135
136void LR35902Reset(struct LR35902Core* cpu);
137void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector);
138
139void LR35902Tick(struct LR35902Core* cpu);
140void LR35902Run(struct LR35902Core* cpu);
141
142CXX_GUARD_END
143
144#endif