z80.h

/* z81/xz81, Linux console and X ZX81/ZX80 emulators.
 * Copyright (C) 1994 Ian Collier. z81 changes (C) 1995-2001 Russell Marks.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _Z80_H_
#define _Z80_H_
#define Z80_quit  1
#define Z80_NMI   2
#define Z80_reset 3
#define Z80_load  4
#define Z80_save  5
#define Z80_log   6

extern int hsize,vsize;
extern int interrupted;
extern unsigned char* const scrnbmp;
extern unsigned char* const scrnbmpc;
extern unsigned long frames;
extern int ay_reg;

/* variables to be stored in a save state */
/* ZX81 and display state */
extern unsigned long frames;
extern int framewait;
extern int vsx;
extern int vsy;
extern int RasterX;
extern int RasterY;
extern int S_RasterX;
extern int S_RasterY;

extern int nmi_pending, hsync_pending;
extern int NMI_generator;
extern int VSYNC_state, HSYNC_state, SYNC_signal;
extern int psync, sync_len;
extern int rowcounter;
extern int hsync_counter;

extern int VSYNC_TOLERANCEMIN;
extern int VSYNC_TOLERANCEMAX;
extern int FRAME_SCAN;

extern bool rowcounter_hold;
extern bool running_rom;
extern bool frameNotSync;

/* Z80 state */
extern unsigned char a, f, b, c, d, e, h, l;
extern unsigned char r, a1, f1, b1, c1, d1, e1, h1, l1, i, iff1, iff2, im;
extern unsigned short pc;
extern unsigned short ix, iy, sp;
extern unsigned char radjust;
extern unsigned char ixoriy, new_ixoriy;
extern unsigned char intsample;
extern unsigned char op;
extern unsigned short m1cycles;

/* ZX80 state variables */
extern int scanlineCounter;
extern int videoFlipFlop1Q;
extern int videoFlipFlop2Q;
extern int videoFlipFlop3Q;
extern int videoFlipFlop3Clear;
extern int prevVideoFlipFlop3Q;
extern int lineClockCarryCounter;
extern int scanline_len;
extern int sync_type;
extern int nosync_lines;
extern bool vsyncFound;

extern void mainloop();
extern void z80_reset(void);
extern void setDisplayBoundaries(void);

#define fetch(x) (memptr[(unsigned short)(x)>>10][(x)&0x3FF])
#define fetch2(x) ((fetch((x)+1)<<8)|fetch(x))
#define fetchm(x) (pc<0xC000 ? fetch(pc) : fetch(pc&0x7fff))

/* due to timing constraints, we presume that only one-byte stores
 * are used by programs for memory-mapped AY addons.
 *
 * Also presume memory-mapped ones don't intercept, just connect
 * (if they don't read, that would be fine).
 */
#ifdef OSS_SOUND_SUPPORT
#define AY_STORE_CHECK(x,y) \
          if(sound_ay) {\
             if(sound_ay_type==AY_TYPE_QUICKSILVA) {\
                switch(x){\
                   case 0x7fff:\
                      ay_reg=((y)&15); break;\
                   case 0x7ffe:\
                      sound_ay_write(ay_reg,(y));\
                }\
             }\
          }
#else
#define AY_STORE_CHECK(x,y)  /* nothing */
#endif

#define QSUDG_STORE_CHECK(x,y) \
         if(useQSUDG) {\
            if (x>=0x8400 && x<0x8800){\
               mem[x] = y;\
               UDGEnabled = true;\
            }\
         }\

#define store(x,y) do {\
          unsigned short off=(x)&0x3FF;\
          unsigned char page=(unsigned short)(x)>>10;\
          int attr=memattr[page];\
          AY_STORE_CHECK(x,y) \
          QSUDG_STORE_CHECK(x,y) \
          if(attr){\
             memptr[page][off]=(y);\
             }\
           } while(0)

#define store2b(x,hi,lo) do {\
          unsigned short off=(x)&0x3FF;\
          unsigned char page=(unsigned short)(x)>>10;\
          int attr=memattr[page];\
          if(attr) { \
             memptr[page][off]=(lo);\
             memptr[page][off+1]=(hi);\
             }\
          } while(0)

#define store2(x,y) store2b(x,(y)>>8,(y)&0xFF)

#ifdef __GNUC__
static void inline storefunc(unsigned short ad,unsigned char b){
   store(ad,b);
}
#undef store
#define store(x,y) storefunc(x,y)

static void inline store2func(unsigned short ad,unsigned char b1,unsigned char b2){
   store2b(ad,b1,b2);
}
#undef store2b
#define store2b(x,hi,lo) store2func(x,hi,lo)
#endif

#define bc ((b<<8)|c)
#define de ((d<<8)|e)
#define hl ((h<<8)|l)

#endif