/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1990 by Sun Microsystems, Inc.
 */

#ifndef _SYS_MACHPCB_H
#define	_SYS_MACHPCB_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/stack.h>
#include <sys/regset.h>
#include <sys/privregs.h>

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * This file is machine dependent.
 */

/*
 * Machine dependent per-thread data.
 */
#define	MAXWIN	8	/* max # 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.
 */

/*
 * Distance from beginning of thread stack (t_stk) to saved regs struct.
 */
#define	REGOFF	MINFRAME

#ifndef _ASM

/*
 * The struct machpcb is always allocated stack aligned.
 */
typedef struct machpcb {
	char	mpcb_frame[REGOFF];
	struct	regs mpcb_regs;	/* user's saved registers */
	struct	rwindow mpcb_wbuf[MAXWIN]; /* user window save buffer */
	caddr_t	mpcb_spbuf[MAXWIN]; /* sp's for each wbuf */
	struct	rwindow mpcb_rwin[2]; /* windows used while doing watchpoints */
	caddr_t	mpcb_rsp[2];	/* sp's for pcb_rwin[]  */
	int	mpcb_uwm;	/* user window mask */
	int	mpcb_swm;	/* shared user/kernel window mask */
	int	mpcb_wbcnt;	/* number of saved windows in pcb_wbuf */
	struct	fpu mpcb_fpu;	/* fpu state */
	struct	fq mpcb_fpu_q[MAXFPQ]; /* fpu exception queue */
	int	mpcb_flags;	/* various state flags */
	int	mpcb_wocnt;	/* window overflow count */
	int	mpcb_wucnt;	/* window underflow count */
	kthread_t *mpcb_thread;	/* associated thread */
} machpcb_t;
#endif /* ! _ASM */

/* mpcb_flags */
#define	CLEAN_WINDOWS	0x01	/* keep user regs clean */
#define	FP_TRAPPED	0x02	/* fp_traps call caused by fp queue */
#define	GOTO_SYS_RTT	0x04	/* return from syscall via sys_rtt */


/*
 * We can use lwp_regs to find the mpcb base.
 */
#ifndef _ASM
#define	lwptompcb(lwp)	((struct machpcb *) \
	    ((caddr_t)(lwp)->lwp_regs - REGOFF))
#endif

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_MACHPCB_H */