86Box/src/include/86box/i8080.h

/*
 * 86Box    A hypervisor and IBM PC system emulator that specializes in
 *          running old operating systems and software designed for IBM
 *          PC systems and compatibles from 1981 through fairly recent
 *          system designs based on the PCI bus.
 *
 *          This file is part of the 86Box distribution.
 *
 *          8080 CPU emulation (header).
 *
 *
 *
 * Authors: Cacodemon345
 *
 *          Copyright 2022 Cacodemon345
 */

#include <stdint.h>

typedef struct i8080 {
    union {
        uint16_t af; /* Intended in case we also go for μPD9002 emulation, which also has a Z80 emulation mode. */
        struct {
            uint8_t a;
            uint8_t flags;
        };
    };
    union {
        uint16_t bc;
        struct {
            uint8_t b;
            uint8_t c;
        };
    };
    union {
        uint16_t de;
        struct {
            uint8_t d;
            uint8_t e;
        };
    };
    union {
        uint16_t hl;
        struct {
            uint8_t h;
            uint8_t l;
        };
    };
    uint16_t  pc;
    uint16_t  sp;
    uint16_t  oldpc;
    uint16_t  ei;
    uint32_t  pmembase;
    uint32_t  dmembase;   /* Base from where i8080 starts. */
    uint8_t   emulated;  /* 0 = not emulated, use separate registers, 1 = emulated, use x86 registers. */
    uint16_t *cpu_flags;
    void    (*writemembyte)(uint32_t, uint8_t);
    uint8_t (*readmembyte)(uint32_t);
    void    (*startclock)(void);
    void    (*endclock)(void);
    void    (*checkinterrupts)(void);
    uint8_t (*fetchinstruction)(void *);
} i8080;

#define C_FLAG_I8080  (1 << 0)
#define P_FLAG_I8080  (1 << 2)
#define AC_FLAG_I8080 (1 << 4)
#define Z_FLAG_I8080  (1 << 6)
#define S_FLAG_I8080  (1 << 7)