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};
 48
 49struct LR35902Memory {
 50	uint16_t (*load16)(struct LR35902Core*, uint16_t address);
 51	uint8_t (*load8)(struct LR35902Core*, uint16_t address);
 52
 53	void (*store16)(struct LR35902Core*, uint16_t address, int16_t value);
 54	void (*store8)(struct LR35902Core*, uint16_t address, int8_t value);
 55
 56	uint8_t* activeRegion;
 57	uint16_t activeMask;
 58	void (*setActiveRegion)(struct LR35902Core*, uint16_t address);
 59};
 60
 61struct LR35902InterruptHandler {
 62	void (*reset)(struct LR35902Core* cpu);
 63	void (*processEvents)(struct LR35902Core* cpu);
 64	void (*setInterrupts)(struct LR35902Core* cpu, bool enable);
 65
 66	void (*hitStub)(struct LR35902Core* cpu);
 67};
 68
 69// TODO: Merge with ARMComponent?
 70struct LR35902Component {
 71	uint32_t id;
 72	void (*init)(struct LR35902Core* cpu, struct LR35902Component* component);
 73	void (*deinit)(struct LR35902Component* component);
 74};
 75
 76struct LR35902Core {
 77#pragma pack(push, 1)
 78	union {
 79		struct {
 80			union FlagRegister f;
 81			uint8_t a;
 82		};
 83		uint16_t af;
 84	};
 85#pragma pack(pop, 1)
 86	union {
 87		struct {
 88			uint8_t c;
 89			uint8_t b;
 90		};
 91		uint16_t bc;
 92	};
 93	union {
 94		struct {
 95			uint8_t e;
 96			uint8_t d;
 97		};
 98		uint16_t de;
 99	};
100	union {
101		struct {
102			uint8_t l;
103			uint8_t h;
104		};
105		uint16_t hl;
106	};
107	uint16_t sp;
108	uint16_t pc;
109
110	uint16_t index;
111
112	int32_t cycles;
113	int32_t nextEvent;
114	enum LR35902ExecutionState executionState;
115	int halted;
116
117	uint8_t bus;
118	bool condition;
119	LR35902Instruction instruction;
120
121	bool irqPending;
122	uint16_t irqVector;
123
124	struct LR35902Memory memory;
125	struct LR35902InterruptHandler irqh;
126
127	struct LR35902Component* master;
128
129	size_t numComponents;
130	struct LR35902Component** components;
131};
132
133static inline uint16_t LR35902ReadHL(struct LR35902Core* cpu) {
134	uint16_t hl;
135	LOAD_16LE(hl, 0, &cpu->hl);
136	return hl;
137}
138
139static inline void LR35902WriteHL(struct LR35902Core* cpu, uint16_t hl) {
140	STORE_16LE(hl, 0, &cpu->hl);
141}
142
143static inline uint16_t LR35902ReadBC(struct LR35902Core* cpu) {
144	uint16_t bc;
145	LOAD_16LE(bc, 0, &cpu->bc);
146	return bc;
147}
148
149static inline void LR35902WriteBC(struct LR35902Core* cpu, uint16_t bc) {
150	STORE_16LE(bc, 0, &cpu->bc);
151}
152
153static inline uint16_t LR35902ReadDE(struct LR35902Core* cpu) {
154	uint16_t de;
155	LOAD_16LE(de, 0, &cpu->de);
156	return de;
157}
158
159static inline void LR35902WriteDE(struct LR35902Core* cpu, uint16_t de) {
160	STORE_16LE(de, 0, &cpu->de);
161}
162
163void LR35902Init(struct LR35902Core* cpu);
164void LR35902Deinit(struct LR35902Core* cpu);
165void LR35902SetComponents(struct LR35902Core* cpu, struct LR35902Component* master, int extra, struct LR35902Component** extras);
166void LR35902HotplugAttach(struct LR35902Core* cpu, size_t slot);
167void LR35902HotplugDetach(struct LR35902Core* cpu, size_t slot);
168
169void LR35902Reset(struct LR35902Core* cpu);
170void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector);
171
172void LR35902Tick(struct LR35902Core* cpu);
173
174#endif