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z80.h
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z80.h
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/*
* GZX - George's ZX Spectrum Emulator
* Z80 CPU emulation
*
* Copyright (c) 1999-2017 Jiri Svoboda
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef Z80_H
#define Z80_H
#include <stdint.h>
/* flags */
#define fS 0x80
#define fZ 0x40
#define fHC 0x10
#define fPV 0x04
#define fN 0x02
#define fC 0x01
/* undocumented flags */
#define fU1 0x08
#define fU2 0x20
/* documented/undocumented flags masks */
#define fU 0x28
#define fD 0xd7
#define rA 0x7
#define rB 0x0
#define rC 0x1
#define rD 0x2
#define rE 0x3
#define rH 0x4
#define rL 0x5
/** Z80 CPU state */
typedef struct _z80s {
/** General-purpose register set (except Flags) */
uint8_t r[8];
/** Flags register */
uint8_t F;
/** Alternate register set (except F') */
uint8_t r_[8];
/** Alternate Flags register */
uint8_t F_;
/** Interrupt page address register */
uint8_t I;
/** Index registers */
uint16_t IX, IY;
/** Program counter */
uint16_t PC;
/** Memory refresh register */
uint8_t R;
/** Stack pointer */
uint16_t SP;
/** Interrupt flip-flops */
int IFF1, IFF2;
/** Interrupt mode */
int int_mode;
/** Blocks INT & NMI (after EI/DI/DD/FD) */
int int_lock;
/** An interrupt is pending */
int int_pending;
/** A NMI is pending */
int nmi_pending;
/** 0 / 0xDD / 0xFD */
int modifier;
/** Halted by the HALT instruction? */
int halted;
} z80s;
extern z80s cpus;
extern z80s *rcpus;
extern unsigned long z80_clock;
extern unsigned long uoc;
extern unsigned long smc;
void z80_init_tables(void);
void z80_execinstr(void);
int z80_reset(void);
void z80_nmi(void);
void z80_int(void);
void z80_resetstat(void);
unsigned z80_getstat(int, uint8_t);
uint16_t z80_getAF(void);
uint16_t z80_getBC(void);
uint16_t z80_getDE(void);
uint16_t z80_getHL(void);
uint16_t z80_getAF_(void);
uint16_t z80_getBC_(void);
uint16_t z80_getDE_(void);
uint16_t z80_getHL_(void);
#endif