#ifndef CPU_H_
#define CPU_H_


typedef struct cpu cpu;

typedef void (*port_write_fun) (cpu *context, uint8_t port, uint16_t value);
typedef uint16_t (*port_read_fun) (cpu *context, uint8_t port);

typedef struct {
	port_write_fun write;
	port_read_fun  read;
} port_handler;


#define MEM_READ 1
#define MEM_WRITE 2

typedef struct {
	uint8_t  *base;
	uint16_t start;
	uint16_t end;
	uint8_t  flags;
} memory_region;


struct cpu {
	void     *system;
	uint32_t cycles;
	uint32_t clock_inc;
	uint32_t num_mem_regions;
	uint16_t regs[16];
	uint16_t exception;
	uint16_t exception_pc;
	uint16_t exception_sr;
	uint16_t exception_ur;
	uint16_t vector_base;
	
	uint16_t prefetch;
	
	uint8_t  state;
	
	port_handler  port_handlers[16];
	memory_region mem_regions[];
};

cpu* alloc_cpu(uint32_t clock_divider, uint32_t num_regions, memory_region *regions);
void run_cpu(cpu *context, uint32_t target_cycle);
extern char * mnemonics[];
extern char * mnemonics_single_src[];
extern char * mnemonics_single_reg[];

enum {
	LDIM,
	LDIMH,
	LD8,
	LD16,
	STR8,
	STR16,
	ADD,
	ADC,
	AND,
	OR,
	XOR,
	LSL,
	LSR,
	ASR,
	BCC,
	SINGLE_SOURCE
};

enum {
	MOVE,
	NEG,
	NOT,
	CMP,
	CALL,
	SWAP,
	IN,
	OUT,
	INI,
	OUTI,
	ADDI,
	ANDI,
	ORI,
	LSI,
	CMPI,
	SINGLE_REG
};

enum {
	RETI,
	TRAP,
	TRAPI,
	GETEPC,
	SETEPC,
	GETESR,
	SETESR,
	GETEUR,
	SETEUR,
	GETENUM,
	SETENUM
};

enum {
	COND_ALWAYS,
	COND_NEVER,
	COND_ZERO,
	COND_NZERO,
	COND_NEG,
	COND_POS,
	COND_CARRY,
	COND_NCARRY,
	COND_GREATER,
	COND_LEQ
};

#define REG_PC 14
#define REG_SR 15

#endif //CPU_H_