nese/src/f6502.h

#ifndef F6502_H_
#define F6502_H_

#include "serdes.h"


#include <stdbool.h>
#include <stdint.h>

#include "memory.h"


typedef enum {
    f6502_Status_C = 0b00000001,
    f6502_Status_Z = 0b00000010,
    f6502_Status_I = 0b00000100,
    f6502_Status_D = 0b00001000,
    f6502_Status_B = 0b00010000,
    f6502_Status_1 = 0b00100000,
    f6502_Status_V = 0b01000000,
    f6502_Status_N = 0b10000000,
} f6502_Status_Flag;

#define f6502_Base_Stack    (0x0100U)

#define f6502_Vector_IRQ    (0xFFFEU)
#define f6502_Vector_Reset  (0xFFFCU)
#define f6502_Vector_NMI    (0xFFFAU)


typedef struct __attribute__ ((__packed__)) {
    uint16_t PC;
    uint8_t  S;
    uint8_t  A;
    uint8_t  X;
    uint8_t  Y;
    uint8_t  P;
} f6502_Registers;

typedef enum {
    f6502_Int_NMI           = 0b00000001,
    f6502_Int_IRQ           = 0b00000010,
    f6502_Int_NMI_Serviced  = 0b10000000,
} f6502_Interrupt;

struct f6502_Core {
    // Static
    f6502_Registers registers;
    f6502_Interrupt interrupts;

    // Specific
    nes_Memory memory;

    // Don't care
    uint64_t clocks;
};
typedef struct f6502_Core f6502_Core;

void f6502_init(f6502_Core*);
void f6502_reset(f6502_Core*);
int f6502_step(f6502_Core*, int clocks);
void f6502_set_NMI(f6502_Core*, bool active);
void f6502_set_IRQ(f6502_Core*, bool active);


extern const Serdes_Item f6502_serdes[];


#endif // F6502_H_