88.h

坦尼保姆

/*
 * LOOK IN table.c for declarations of all of this stuff
 */

#ifndef EXTERN
#define EXTERN
#endif
#define CHECK 0			/* To turn on runtime checking, set CHECK 1 */
typedef short word;		/* type word must be 16 bits */
typedef unsigned short adr;	/* unsigned 16-bit quantity */

#ifdef pdp
typedef unsigned unchr;
#else
typedef unsigned char unchr;
#endif

#define	LITTLE_ENDIAN	/* vax and the like */
#undef	BIG_ENDIAN	/* sun and the like */

#ifdef LITTLE_ENDIAN
typedef struct {unchr lo; unchr hi; } pair;
# define AL 0
# define AH 1
# define BL 2
# define BH 3
# define CL 4
# define CH 5
# define DL 6
# define DH 7
#endif

#ifdef BIG_ENDIAN
typedef struct {unchr hi; unchr lo; } pair;
# define AL 1
# define AH 0
# define BL 3
# define BH 2
# define CL 5
# define CH 4
# define DL 7
# define DH 6
#endif


typedef union {pair b; word w;} reg;


#define AX 0
#define BX 1
#define CX 2
#define DX 3
#define SI 4
#define DI 5
#define BP 6
#define SP 7


#define ax r.rw[AX]
#define bx r.rw[BX]
#define cx r.rw[CX]
#define dx r.rw[DX]
#define si r.rw[SI]
#define di r.rw[DI]
#define bp r.rw[BP]
#define sp r.rw[SP]

#define al r.rc[AL]
#define ah r.rc[AH]
#define bl r.rc[BL]
#define bh r.rc[BH]
#define cl r.rc[CL]
#define ch r.rc[CH]
#define dl r.rc[DL]
#define dh r.rc[DH]

#define W00 AX			/* Wxx used for submultiplexing, e.g. op 81 */
#define W01 CX
#define W02 DX
#define W03 BX
#define W04 SP
#define W05 BP
#define W06 SI
#define W07 DI

#define B00 AL
#define B01 CL
#define B02 DL
#define B03 BL
#define B04 AH
#define B05 CH
#define B06 DH
#define B07 BH

#define ea EA.w
#define ealo EA.b.lo
#define eahi EA.b.hi

#define ra RA.w
#define ralo RA.b.lo
#define rahi RA.b.hi

#define eop EOP.w
#define eoplo EOP.b.lo
#define eophi EOP.b.hi

#define rop ROP.w
#define roplo ROP.b.lo
#define rophi ROP.b.hi

#define ADDW 0			/* codes used for lazy condition code eval */
#define ADDB 1
#define ADCW 2
#define ADCB 3
#define INCW 4
#define INCB 5
#define SUBW 6
#define SUBB 7
#define SBBW 8
#define SBBB 9
#define DECW 10
#define DECB 11
#define BOOLW 12
#define BOOLC 13

/* Here are the values used in 'nextint' to tell which kind of interrupt next.*/
#define SEGOVER 1
#define CLOCK   2
#define TTYIN   3
#define TTYOUT  4
#define DISK    5
#define	KBD	6
#define NDEV    8			/* number of I/O devices */

#define	DIVIDEVEC	 0
#define CLOCKVEC	 8
#define	KBDVEC		 9
#define	XT_WINI		13
#define DISKVEC		14	/* floppy */
#define	SYS_VEC		32
#define TTYINVEC	35
#define TTYOUTVEC	36


/* I/O ports and related constants. */
#define PIT_C 0x00D6		/* output port to enable clock */
#define SIO_C 0x00DA		/* tty control port */
#define SIO_D 0x00D8		/* tty data port */
#define	TIMER_2	0x0042		/* timer port 2 */
#define TIMER_3	0x0043		/* timer port 3 */
#define SIO_M 0x0043		/* tty port for enabling/disabling interrupt */
#define	KEYBD 0x0060		/* keyboard data port */
#define PORT_B 0x0061		/* keyboard strobe port */

#define TXRDY 01
#define RXRDY 02
#define DXRDY 01
#define FROM_DISK 0
#define TO_DISK 1

/* Variables used by I/O. */
EXTERN int ttystat;
EXTERN int clkinterval;



#define MEMBYTES 1048576L	/* how many bytes does 8088 have? * /
#define MEMBYTES 32768 		/* how many bytes ew small simulator*/
#define HALFMEM 6000		/* 1/2 of MEMBYTES */
#define MAXLONG 2000000000L
#define INTERVAL 50000

EXTERN reg EA, RA, EOP, ROP;
EXTERN int ovf, dirf, intf, signf, zerof, cf;	/* flag bits */
EXTERN char *pcx;		/* pcx = &m[ (cs<<4) + pc] */
EXTERN char *pcx_save;		/* pcx saved here at instruction start */
EXTERN char *xapc;
EXTERN char *eapc, *rapc;
EXTERN word *rapw;		/* eapw is unusable since it might be odd */
EXTERN word *stkp;		/* scratch variable used by PUSH and POP */
EXTERN int mask;

EXTERN adr cs, ds, ss, es;	/* contents of segment registers */
EXTERN adr xs, dsx, ssx;
EXTERN long cs16;		/* cs16 = 16*cs  (= cs<<4) */

EXTERN unsigned timer, ticks, nextint, ints_pending;
EXTERN long realtime;		/* measured in mach instr (5 microsec each) */
EXTERN struct intstruct{

  long int_time;		/* time of next interrupt (in mach instrs) */
  int int_status;		/* status information */
  int int_vector;
} intstruct[NDEV];

#define ENABLED 01

EXTERN long l, l1, l2;		/* scratch variables used for setting carry */
EXTERN short x,y,z;		/* used in lazy condition code evaluation */
EXTERN unchr xc,yc,zc;		/* ditto */
EXTERN int operator, ccvalid;	/* ditto */
EXTERN int anything;		/* nonzero if any dumping or tracing on */
EXTERN int whendump;		/* controls dumping */
EXTERN int whatdump;		/* controls dumping */
EXTERN long xx;			/* scratch variable used for mem checking */
EXTERN unchr stopvlag, dumpt;	/* ew dumping vlag and saved t */


/* The 8088 memory array is declared below.  The definition is as it is to get
 * around a defect in the PDP-11 cc compiler.  That compiler will not accept
 * character arrays with > 32K elements.
 */
#ifdef pdp
extern char m[HALFMEM];
#else
extern char m[MEMBYTES];
#endif
typedef	union { unchr rc[16]; word rw[8];} REG;
extern REG r;
/* union{unchr rc[16]; word rw[8];}r;	/* AX,BX,CX,DX,SI,DI,BP,SP */
extern int traceflag, procdepth(), breakpt(), instrcount, codelength;
extern char errbuf[];