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)
 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	void (*halt)(struct LR35902Core* cpu);
 67
 68	void (*hitStub)(struct LR35902Core* cpu);
 69};
 70
 71// TODO: Merge with ARMComponent?
 72struct LR35902Component {
 73	uint32_t id;
 74	void (*init)(struct LR35902Core* cpu, struct LR35902Component* component);
 75	void (*deinit)(struct LR35902Component* component);
 76};
 77
 78struct LR35902Core {
 79#pragma pack(push, 1)
 80	union {
 81		struct {
 82			union FlagRegister f;
 83			uint8_t a;
 84		};
 85		uint16_t af;
 86	};
 87#pragma pack(pop)
 88	union {
 89		struct {
 90			uint8_t c;
 91			uint8_t b;
 92		};
 93		uint16_t bc;
 94	};
 95	union {
 96		struct {
 97			uint8_t e;
 98			uint8_t d;
 99		};
100		uint16_t de;
101	};
102	union {
103		struct {
104			uint8_t l;
105			uint8_t h;
106		};
107		uint16_t hl;
108	};
109	uint16_t sp;
110	uint16_t pc;
111
112	uint16_t index;
113
114	int32_t cycles;
115	int32_t nextEvent;
116	enum LR35902ExecutionState executionState;
117	bool halted;
118
119	uint8_t bus;
120	bool condition;
121	LR35902Instruction instruction;
122
123	bool irqPending;
124	uint16_t irqVector;
125
126	struct LR35902Memory memory;
127	struct LR35902InterruptHandler irqh;
128
129	struct LR35902Component* master;
130
131	size_t numComponents;
132	struct LR35902Component** components;
133};
134
135static inline uint16_t LR35902ReadHL(struct LR35902Core* cpu) {
136	uint16_t hl;
137	LOAD_16LE(hl, 0, &cpu->hl);
138	return hl;
139}
140
141static inline void LR35902WriteHL(struct LR35902Core* cpu, uint16_t hl) {
142	STORE_16LE(hl, 0, &cpu->hl);
143}
144
145static inline uint16_t LR35902ReadBC(struct LR35902Core* cpu) {
146	uint16_t bc;
147	LOAD_16LE(bc, 0, &cpu->bc);
148	return bc;
149}
150
151static inline void LR35902WriteBC(struct LR35902Core* cpu, uint16_t bc) {
152	STORE_16LE(bc, 0, &cpu->bc);
153}
154
155static inline uint16_t LR35902ReadDE(struct LR35902Core* cpu) {
156	uint16_t de;
157	LOAD_16LE(de, 0, &cpu->de);
158	return de;
159}
160
161static inline void LR35902WriteDE(struct LR35902Core* cpu, uint16_t de) {
162	STORE_16LE(de, 0, &cpu->de);
163}
164
165void LR35902Init(struct LR35902Core* cpu);
166void LR35902Deinit(struct LR35902Core* cpu);
167void LR35902SetComponents(struct LR35902Core* cpu, struct LR35902Component* master, int extra, struct LR35902Component** extras);
168void LR35902HotplugAttach(struct LR35902Core* cpu, size_t slot);
169void LR35902HotplugDetach(struct LR35902Core* cpu, size_t slot);
170
171void LR35902Reset(struct LR35902Core* cpu);
172void LR35902RaiseIRQ(struct LR35902Core* cpu, uint8_t vector);
173
174void LR35902Tick(struct LR35902Core* cpu);
175
176#endif