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 "util/common.h"
 10
 11#include "lr35902/isa-lr35902.h"
 12
 13struct LR35902Core;
 14
 15#pragma pack(push, 1)
 16union FlagRegister {
 17	struct {
 18#if defined(__POWERPC__) || defined(__PPC__)
 19		unsigned z : 1;
 20		unsigned n : 1;
 21		unsigned h : 1;
 22		unsigned c : 1;
 23		unsigned : 4;
 24#else
 25		unsigned : 4;
 26		unsigned c : 1;
 27		unsigned h : 1;
 28		unsigned n : 1;
 29		unsigned z : 1;
 30#endif
 31	};
 32
 33	uint8_t packed;
 34};
 35#pragma pack(pop, 1)
 36
 37enum LR35902ExecutionState {
 38	LR35902_CORE_FETCH = 0,
 39	LR35902_CORE_IDLE_0,
 40	LR35902_CORE_IDLE_1,
 41	LR35902_CORE_EXECUTE = 3,
 42
 43	LR35902_CORE_MEMORY_LOAD = 4,
 44	LR35902_CORE_MEMORY_STORE = 8,
 45	LR35902_CORE_READ_PC = 12,
 46	LR35902_CORE_STALL = 16,
 47	LR35902_CORE_OP2 = 20
 48};
 49
 50struct LR35902Memory {
 51	uint16_t (*load16)(struct LR35902Core*, uint16_t address);
 52	uint8_t (*load8)(struct LR35902Core*, uint16_t address);
 53
 54	void (*store16)(struct LR35902Core*, uint16_t address, int16_t value);
 55	void (*store8)(struct LR35902Core*, uint16_t address, int8_t value);
 56
 57	uint8_t* activeRegion;
 58	uint16_t activeMask;
 59	void (*setActiveRegion)(struct LR35902Core*, uint16_t address);
 60};
 61
 62struct LR35902InterruptHandler {
 63	void (*reset)(struct LR35902Core* cpu);
 64	void (*processEvents)(struct LR35902Core* cpu);
 65	void (*setInterrupts)(struct LR35902Core* cpu, bool enable);
 66
 67	void (*hitStub)(struct LR35902Core* cpu);
 68};
 69
 70// TODO: Merge with ARMComponent?
 71struct LR35902Component {
 72	uint32_t id;
 73	void (*init)(struct LR35902Core* cpu, struct LR35902Component* component);
 74	void (*deinit)(struct LR35902Component* component);
 75};
 76
 77struct LR35902Core {
 78#pragma pack(push, 1)
 79	union {
 80		struct {
 81			union FlagRegister f;
 82			uint8_t a;
 83		};
 84		uint16_t af;
 85	};
 86#pragma pack(pop, 1)
 87	union {
 88		struct {
 89			uint8_t c;
 90			uint8_t b;
 91		};
 92		uint16_t bc;
 93	};
 94	union {
 95		struct {
 96			uint8_t e;
 97			uint8_t d;
 98		};
 99		uint16_t de;
100	};
101	union {
102		struct {
103			uint8_t l;
104			uint8_t h;
105		};
106		uint16_t hl;
107	};
108	uint16_t sp;
109	uint16_t pc;
110
111	uint16_t index;
112
113	int32_t cycles;
114	int32_t nextEvent;
115	enum LR35902ExecutionState executionState;
116	int halted;
117
118	uint8_t bus;
119	bool condition;
120	LR35902Instruction instruction;
121
122	bool irqPending;
123	uint16_t irqVector;
124
125	struct LR35902Memory memory;
126	struct LR35902InterruptHandler irqh;
127
128	struct LR35902Component* master;
129
130	size_t numComponents;
131	struct LR35902Component** components;
132};
133
134static inline uint16_t LR35902ReadHL(struct LR35902Core* cpu) {
135	uint16_t hl;
136	LOAD_16LE(hl, 0, &cpu->hl);
137	return hl;
138}
139
140static inline void LR35902WriteHL(struct LR35902Core* cpu, uint16_t hl) {
141	STORE_16LE(hl, 0, &cpu->hl);
142}
143
144static inline uint16_t LR35902ReadBC(struct LR35902Core* cpu) {
145	uint16_t bc;
146	LOAD_16LE(bc, 0, &cpu->bc);
147	return bc;
148}
149
150static inline void LR35902WriteBC(struct LR35902Core* cpu, uint16_t bc) {
151	STORE_16LE(bc, 0, &cpu->bc);
152}
153
154static inline uint16_t LR35902ReadDE(struct LR35902Core* cpu) {
155	uint16_t de;
156	LOAD_16LE(de, 0, &cpu->de);
157	return de;
158}
159
160static inline void LR35902WriteDE(struct LR35902Core* cpu, uint16_t de) {
161	STORE_16LE(de, 0, &cpu->de);
162}
163
164void LR35902Init(struct LR35902Core* cpu);
165void LR35902Deinit(struct LR35902Core* cpu);
166void LR35902SetComponents(struct LR35902Core* cpu, struct LR35902Component* master, int extra, struct LR35902Component** extras);
167void LR35902HotplugAttach(struct LR35902Core* cpu, size_t slot);
168void LR35902HotplugDetach(struct LR35902Core* cpu, size_t slot);
169
170void LR35902Reset(struct LR35902Core* cpu);
171void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector);
172
173void LR35902Tick(struct LR35902Core* cpu);
174
175#endif