mirror of
https://github.com/libretro/Genesis-Plus-GX.git
synced 2024-11-24 00:39:45 +00:00
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
#ifndef Z80_H_
|
|
#define Z80_H_
|
|
|
|
#include "osd_cpu.h"
|
|
|
|
enum
|
|
{
|
|
/* line states */
|
|
CLEAR_LINE = 0, /* clear (a fired, held or pulsed) line */
|
|
ASSERT_LINE, /* assert an interrupt immediately */
|
|
HOLD_LINE, /* hold interrupt line until acknowledged */
|
|
PULSE_LINE /* pulse interrupt line for one instruction */
|
|
};
|
|
|
|
enum {
|
|
Z80_PC, Z80_SP,
|
|
Z80_A, Z80_B, Z80_C, Z80_D, Z80_E, Z80_H, Z80_L,
|
|
Z80_AF, Z80_BC, Z80_DE, Z80_HL,
|
|
Z80_IX, Z80_IY, Z80_AF2, Z80_BC2, Z80_DE2, Z80_HL2,
|
|
Z80_R, Z80_I, Z80_IM, Z80_IFF1, Z80_IFF2, Z80_HALT,
|
|
Z80_DC0, Z80_DC1, Z80_DC2, Z80_DC3, Z80_WZ
|
|
};
|
|
|
|
enum {
|
|
Z80_TABLE_op,
|
|
Z80_TABLE_cb,
|
|
Z80_TABLE_ed,
|
|
Z80_TABLE_xy,
|
|
Z80_TABLE_xycb,
|
|
Z80_TABLE_ex /* cycles counts for taken jr/jp/call and interrupt latency (rst opcodes) */
|
|
};
|
|
|
|
/****************************************************************************/
|
|
/* The Z80 registers. HALT is set to 1 when the CPU is halted, the refresh */
|
|
/* register is calculated as follows: refresh=(Z80.r&127)|(Z80.r2&128) */
|
|
/****************************************************************************/
|
|
typedef struct
|
|
{
|
|
PAIR pc,sp,af,bc,de,hl,ix,iy,wz;
|
|
PAIR af2,bc2,de2,hl2;
|
|
UINT8 r,r2,iff1,iff2,halt,im,i;
|
|
UINT8 nmi_state; /* nmi line state */
|
|
UINT8 nmi_pending; /* nmi pending */
|
|
UINT8 irq_state; /* irq line state */
|
|
UINT8 after_ei; /* are we in the EI shadow? */
|
|
UINT32 cycles; /* master clock cycles global counter */
|
|
const struct z80_irq_daisy_chain *daisy;
|
|
int (*irq_callback)(int irqline);
|
|
} Z80_Regs;
|
|
|
|
|
|
extern Z80_Regs Z80;
|
|
|
|
#ifdef Z80_OVERCLOCK_SHIFT
|
|
extern UINT32 z80_cycle_ratio;
|
|
#endif
|
|
|
|
extern unsigned char *z80_readmap[64];
|
|
extern unsigned char *z80_writemap[64];
|
|
|
|
extern void (*z80_writemem)(unsigned int address, unsigned char data);
|
|
extern unsigned char (*z80_readmem)(unsigned int address);
|
|
extern void (*z80_writeport)(unsigned int port, unsigned char data);
|
|
extern unsigned char (*z80_readport)(unsigned int port);
|
|
|
|
extern void z80_init(const void *config, int (*irqcallback)(int));
|
|
extern void z80_reset (void);
|
|
extern void z80_run(unsigned int cycles);
|
|
extern void z80_get_context (void *dst);
|
|
extern void z80_set_context (void *src);
|
|
extern void z80_set_irq_line(unsigned int state);
|
|
extern void z80_set_nmi_line(unsigned int state);
|
|
|
|
#endif
|
|
|