mirror of
https://github.com/italicsjenga/agb.git
synced 2024-12-26 01:31:33 +11:00
173 lines
3.5 KiB
C
173 lines
3.5 KiB
C
/* Copyright (c) 2013-2016 Jeffrey Pfau
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
#ifndef SM83_H
|
|
#define SM83_H
|
|
|
|
#include <mgba-util/common.h>
|
|
|
|
CXX_GUARD_START
|
|
|
|
#include <mgba/core/cpu.h>
|
|
#include <mgba/internal/sm83/isa-sm83.h>
|
|
|
|
struct SM83Core;
|
|
|
|
#pragma pack(push, 1)
|
|
union FlagRegister {
|
|
struct {
|
|
#ifdef __BIG_ENDIAN__
|
|
unsigned z : 1;
|
|
unsigned n : 1;
|
|
unsigned h : 1;
|
|
unsigned c : 1;
|
|
unsigned unused : 4;
|
|
#else
|
|
unsigned unused : 4;
|
|
unsigned c : 1;
|
|
unsigned h : 1;
|
|
unsigned n : 1;
|
|
unsigned z : 1;
|
|
#endif
|
|
};
|
|
|
|
uint8_t packed;
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
enum SM83ExecutionState {
|
|
SM83_CORE_FETCH = 3,
|
|
SM83_CORE_IDLE_0 = 0,
|
|
SM83_CORE_IDLE_1 = 1,
|
|
SM83_CORE_EXECUTE = 2,
|
|
|
|
SM83_CORE_MEMORY_LOAD = 7,
|
|
SM83_CORE_MEMORY_STORE = 11,
|
|
SM83_CORE_READ_PC = 15,
|
|
SM83_CORE_STALL = 19,
|
|
SM83_CORE_OP2 = 23,
|
|
SM83_CORE_HALT_BUG = 27,
|
|
};
|
|
struct SM83Memory {
|
|
uint8_t (*cpuLoad8)(struct SM83Core*, uint16_t address);
|
|
uint8_t (*load8)(struct SM83Core*, uint16_t address);
|
|
void (*store8)(struct SM83Core*, uint16_t address, int8_t value);
|
|
|
|
int (*currentSegment)(struct SM83Core*, uint16_t address);
|
|
|
|
const uint8_t* activeRegion;
|
|
uint16_t activeMask;
|
|
uint16_t activeRegionEnd;
|
|
void (*setActiveRegion)(struct SM83Core*, uint16_t address);
|
|
};
|
|
|
|
struct SM83InterruptHandler {
|
|
void (*reset)(struct SM83Core* cpu);
|
|
void (*processEvents)(struct SM83Core* cpu);
|
|
void (*setInterrupts)(struct SM83Core* cpu, bool enable);
|
|
uint16_t (*irqVector)(struct SM83Core* cpu);
|
|
void (*halt)(struct SM83Core* cpu);
|
|
void (*stop)(struct SM83Core* cpu);
|
|
|
|
void (*hitIllegal)(struct SM83Core* cpu);
|
|
};
|
|
|
|
#ifdef __BIG_ENDIAN__
|
|
#define SM83_REGISTER_PAIR(HIGH, LOW) union { \
|
|
struct { \
|
|
uint8_t HIGH; \
|
|
uint8_t LOW; \
|
|
}; \
|
|
uint16_t HIGH ## LOW; \
|
|
}
|
|
|
|
#define SM83_AF_REGISTER union { \
|
|
struct { \
|
|
uint8_t a; \
|
|
union FlagRegister f; \
|
|
}; \
|
|
uint16_t af; \
|
|
}
|
|
#else
|
|
#define SM83_REGISTER_PAIR(HIGH, LOW) union { \
|
|
struct { \
|
|
uint8_t LOW; \
|
|
uint8_t HIGH; \
|
|
}; \
|
|
uint16_t HIGH ## LOW; \
|
|
}
|
|
|
|
#define SM83_AF_REGISTER union { \
|
|
struct { \
|
|
union FlagRegister f; \
|
|
uint8_t a; \
|
|
}; \
|
|
uint16_t af; \
|
|
}
|
|
#endif
|
|
|
|
#define SM83_REGISTER_FILE struct { \
|
|
SM83_AF_REGISTER; \
|
|
SM83_REGISTER_PAIR(b, c); \
|
|
SM83_REGISTER_PAIR(d, e); \
|
|
SM83_REGISTER_PAIR(h, l); \
|
|
uint16_t sp; \
|
|
uint16_t pc; \
|
|
}
|
|
|
|
struct SM83RegisterFile {
|
|
#pragma pack(push, 1)
|
|
SM83_REGISTER_FILE;
|
|
#pragma pack(pop)
|
|
};
|
|
|
|
struct SM83Core {
|
|
#pragma pack(push, 1)
|
|
union {
|
|
struct SM83RegisterFile regs;
|
|
SM83_REGISTER_FILE;
|
|
};
|
|
#pragma pack(pop)
|
|
|
|
uint16_t index;
|
|
|
|
int tMultiplier;
|
|
int32_t cycles;
|
|
int32_t nextEvent;
|
|
enum SM83ExecutionState executionState;
|
|
bool halted;
|
|
|
|
uint8_t bus;
|
|
bool condition;
|
|
SM83Instruction instruction;
|
|
|
|
bool irqPending;
|
|
|
|
struct SM83Memory memory;
|
|
struct SM83InterruptHandler irqh;
|
|
|
|
struct mCPUComponent* master;
|
|
|
|
size_t numComponents;
|
|
struct mCPUComponent** components;
|
|
};
|
|
#undef SM83_REGISTER_FILE
|
|
|
|
void SM83Init(struct SM83Core* cpu);
|
|
void SM83Deinit(struct SM83Core* cpu);
|
|
void SM83SetComponents(struct SM83Core* cpu, struct mCPUComponent* master, int extra, struct mCPUComponent** extras);
|
|
void SM83HotplugAttach(struct SM83Core* cpu, size_t slot);
|
|
void SM83HotplugDetach(struct SM83Core* cpu, size_t slot);
|
|
|
|
void SM83Reset(struct SM83Core* cpu);
|
|
void SM83RaiseIRQ(struct SM83Core* cpu);
|
|
|
|
void SM83Tick(struct SM83Core* cpu);
|
|
void SM83Run(struct SM83Core* cpu);
|
|
|
|
CXX_GUARD_END
|
|
|
|
#endif
|