/****************************************************************/
/*								*/
/*			       pcb.h				*/
/*								*/
/*	     Process Control and Interrupt data structures	*/
/*								*/
/*			 November 26, 1991			*/
/*								*/
/*			Copyright (c) 1995			*/
/*			Pasquale J. Villani			*/
/*			All Rights Reserved			*/
/*								*/
/* This file is part of DOS-C.					*/
/*								*/
/* DOS-C 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, or (at your option) any later version.			*/
/*								*/
/* DOS-C 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 DOS-C; see the file COPYING.  If not,	*/
/* write to the Free Software Foundation, 675 Mass Ave,		*/
/* Cambridge, MA 02139, USA.					*/
/****************************************************************/


/* $Logfile*/
#ifdef MAIN
#ifndef IPL
static BYTE *pcb_hRcsId = "$Header:   C:/dos-c/hdr/pcb.h_v   1.2   01 Sep 1995 17:35:44   patv  $";
# endif
#endif

/*
 * $Log:   C:/dos-c/hdr/pcb.h_v  $
 *	
 *	   Rev 1.2   01 Sep 1995 17:35:44   patv
 *	First GPL release.
 *	
 *	   Rev 1.1   30 Jul 1995 20:43:50   patv
 *	Eliminated version strings in ipl
 *	
 *	   Rev 1.0   02 Jul 1995 10:39:48   patv
 *	Initial revision.
 */

/*									*/
/* interrupt handler structure definition				*/
/*									*/
typedef union
{
	UWORD	x;		/* access mode for ax, bx, etc.		*/
	struct
	{
		UBYTE	l;	/* access mode for al, bl, etc.		*/
		UBYTE	h;	/* access mode for ah, bh, etc.		*/
	} b;
} xreg;

/* maps compiler unique stacking order					*/
typedef struct
{
#ifdef __BORLANDC__
	UWORD bp, di, si, ds, es;
	xreg d, c, b, a;
#else /* MSC */
	UWORD es, ds;
	UWORD di, si, bp, sp;
	xreg b, d, c, a;
#endif
	UWORD ip, cs, flags;
} iregs;

/* Process control block for task switching				*/
typedef struct
{
	UWORD pc_ss;
	UWORD pc_sp;
	iregs	pc_regs;
} pcb;

/* For MSC, the following offsets must match the assembly process	*/
/* support offsets							*/
/* NOTE: Alignemnts must be set to 1 (-Zp1)				*/
/*	ss:	0							*/
/*	sp:	2							*/
/*	es:	4							*/
/*	ds:	6							*/
/*	di:	8							*/
/*	si:	10							*/
/*	bp:	12							*/
/*	sp:	14	NOTE: not used in this structure		*/
/*	bx:	16							*/
/*	dx:	18							*/
/*	cx:	20							*/
/*	ax:	22							*/
/*	ip:	24							*/
/*	cs:	26							*/
/*	flags:	28							*/
/*									*/
/* For Borland C, the following offsets must match the assembly process	*/
/* support offsets							*/
/*	ss:	0							*/
/*	sp:	2							*/
/*	bp:	4							*/
/*	di:	6							*/
/*	si:	8							*/
/*	ds:	10							*/
/*	es:	12							*/
/*	dx:	14							*/
/*	cx:	16							*/
/*	bx:	18							*/
/*	ax:	20							*/
/*	ip:	22							*/
/*	cs:	24							*/
/*	flags:	26							*/


#define	BP	bp
#define	DI	di
#define	SI	si
#define	DS	ds
#define	ES	es
#define	DX	d.x 
#define	CX	c.x 
#define	BX	b.x 
#define	AX	a.x
#define	DH	d.b.h 
#define	CH	c.b.h 
#define	BH	b.b.h 
#define	AH	a.b.h
#define	DL	d.b.l 
#define	CL	c.b.l 
#define	BL	b.b.l 
#define	AL	a.b.l
#define	IP	ip
#define	CS	cs
#define	FLAGS	flags

#define	FLG_ZERO	0x0040
#define FLG_CARRY	0x0001