2.11BSD/sys/pdp/koverlay.h

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/*
 * Copyright (c) 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)koverlay.h	1.1 (2.10BSD Berkeley) 12/1/86
 */

/*
 *	Definitions relating to kernel text overlays.  The kernel and
 *	stand/bootstrap/boot.c must be recompiled if these are changed.
 *	In practice, it is very difficult to change these numbers since
 *	many changes will be necessary in mch.s.  This file is provided
 *	mainly to specify how kernel overlays are laid out, not for tuning.
 *
 *
 *	Primary variables:
 *		# ovly regs	the maximum size of a kernel
 *				overlay segment will be
 *				8k bytes * # ovly regs.
 *				Currently, must be 1.
 *
 *		OVLY_TABLE_BASE	the address in l.s where the
 *				kernel stores the prototype
 *				PARs and PDRs.  The only one
 *				of the constants in this file
 *				which may readily be changed.
 *
 *		NUM_TEXT_REGS	the maximum size of the kernel
 *				base text segment will be
 *				8k bytes * NUM_TEXT_REGS.
 */

#define	OVLY_TABLE_BASE		01000

#define	I_NUM_TEXT_REGS		7	/* 8 - # ovly regs */
#define	N_NUM_TEXT_REGS		2

#ifdef KERN_NONSEP
#define	NUM_TEXT_REGS		N_NUM_TEXT_REGS
#else !KERN_NONSEP
#define	NUM_TEXT_REGS		I_NUM_TEXT_REGS
#endif KERN_NONSEP

#define	I_MAX_DATA_REGS		6
#define	N_MAX_DATA_REGS		3	/* 6 - NUM_TEXT_REGS - # ovly regs */

#ifdef KERN_NONSEP
#define	MAX_DATA_REGS		N_MAX_DATA_REGS
#else !KERN_NONSEP
#define	MAX_DATA_REGS		I_MAX_DATA_REGS
#endif KERN_NONSEP

#define	I_DATA_PAR_BASE		KDSA0
#define	N_DATA_PAR_BASE		KISA3	/* &KISA[NUM_TEXT_REGS + # ovly regs] */

#ifdef KERN_NONSEP
#define	DATA_PAR_BASE		N_DATA_PAR_BASE
#else !KERN_NONSEP
#define	DATA_PAR_BASE		I_DATA_PAR_BASE
#endif KERN_NONSEP

#define	I_DATA_PDR_BASE		KDSD0
#define	N_DATA_PDR_BASE		KISD3	/* &KISD[NUM_TEXT_REGS + # ovly regs] */

#ifdef KERN_NONSEP
#define	DATA_PDR_BASE		N_DATA_PDR_BASE
#else !KERN_NONSEP
#define	DATA_PDR_BASE		I_DATA_PDR_BASE
#endif KERN_NONSEP

#define	TEXT_PAR_BASE		KISA0
#define	TEXT_PDR_BASE		KISD0

#ifdef KERN_NONSEP
#define	OVLY_PAR		KISA2	/* &KISA[NUM_TEXT_REGS] */
#define	OVLY_PDR		KISD2	/* &KISD[NUM_TEXT_REGS] */
#else !KERN_NONSEP
#define	OVLY_PAR		KISA7	/* &KISA[NUM_TEXT_REGS] */
#define	OVLY_PDR		KISD7	/* &KISD[NUM_TEXT_REGS] */
#endif KERN_NONSEP