/*
 * 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

#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 */