/*	@(#)pcb.h 1.1 94/10/31 SMI	*/

/*
 * Copyright (c) 1985 by Sun Microsystems, Inc.
 */

#ifndef _sun4m_pcb_h
#define	_sun4m_pcb_h

/*
 * Sun software process control block
 */

#include <machine/reg.h>

#define	MAXWIN	12		/* max number of windows currently supported */

/*
 * The system actually supports one more than the above number.
 * There is always one window reserved for trap handlers that
 * never has to be saved into the pcb struct.
 */

#ifndef LOCORE
#include <machine/vm_hat.h>
struct pcb {
/*
 * In order to keep the pcb the same size as what we shipped
 * to customers in 4.1.2, there must be exactly one
 * kilobyte of data in the structure before the pcb_regs
 * field, and the structure must be otherwise identical to the
 * standard version for the other SPARCs.
 *
 * If you mess this up, then all the unbundled products that
 * were released based on the SunOS 4.1.2 MP release for the
 * Sun-4M kernel archetecture must be recompiled and, more
 * painfully, rereleased. So, you can't make that change until
 * all those products -- including the "OnLine: Disk Suite" --
 * have to be rereleased for other reasons (like SVr4 support).
 */
	int	pcb_pad[256];	/* pad to one kilobyte */

	label_t	pcb_regs;	/* saved pc and sp */
	int	pcb_psr; 	/* processor status word */
	int	pcb_uwm;	/* user window mask */
	struct	rwindow pcb_wbuf[MAXWIN]; /* user window save buffer */
	char	*pcb_spbuf[MAXWIN]; /* sp's for each wbuf */
	int	pcb_wbcnt;	/* number of saved windows in pcb_wbuf */

	int	*pcb_psrp;	/* psr pointer to en/disable coprocessors */
	struct	fpu *pcb_fpctxp;	/* pointer to fpu state */
	int	pcb_fpflags;	/* fpu enable flags */
	int	*pcb_cpctxp;	/* pointer to coprocessor state */
	int	pcb_cpflags;	/* coprocessor enable flags */

	int	pcb_flags;	/* various state flags */
	int	pcb_wocnt;	/* window overflow count */
	int	pcb_wucnt;	/* window underflow count */
};

#define	pcb_pc		pcb_regs.val[0]
#define	pcb_sp		pcb_regs.val[1]

#define	aston()		{u.u_pcb.pcb_flags |= AST_SCHED; }

#define	astoff()	{u.u_pcb.pcb_flags &= ~AST_SCHED; }

#endif !LOCORE

/* pcb_flags */
#define	AST_SCHED	0x80000000	/* force a reschedule */
#define	AST_CLR		0x80000000
#define	PME_CLR		0
#define	AST_NONE	0

/* pcb_flags */
#define	CLEAN_WINDOWS	0x1		/* keep user regs clean */
#define	FIX_ALIGNMENT	0x2		/* fix unaligned references */
#define	MM_SBUS_DEVS	0x4		/* mmap'd sbus dev(s) */
#define	MM_VME_DEVS	0x8		/* mmap'd vme dev(s) */
#define	MM_DEVS		(MM_SBUS_DEVS | MM_VME_DEVS)

#endif /* !_sun4m_pcb_h */