simak65.h

/* SimAK65 interface
 * Copyright A.K. 2018, 2023
 */

#ifndef SIMAK65_H_
#define SIMAK65_H_

#include <stdint.h>

struct simak65_bus {
	uint8_t (*read)(uint16_t address);
	void (*write)(uint16_t address, uint8_t byte);
};

struct simak65_cpustate {
	uint16_t pc;
	uint8_t a;
	uint8_t x;
	uint8_t y;
	uint8_t sp;
	uint8_t flags;
};

/* Execute next instruction */
void simak65_step(struct simak65_cpustate *cpu, unsigned int *cycles);

/* Execute reset */
void simak65_rst(struct simak65_cpustate *cpu, unsigned int *cycles);

/* Execute non-maskable interrupt */
void simak65_nmi(struct simak65_cpustate *cpu, unsigned int *cycles);

/* Execute interrupt */
void simak65_irq(struct simak65_cpustate *cpu, unsigned int *cycles);

/* Perform core initialization (excluding CPU reset) */
void simak65_init(struct simak65_cpustate *cpu, const struct simak65_bus *ops);

#endif /* SIMAK65_H_ */