usr/src/sys/i386/include/pcb.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)pcb.h       5.10 (Berkeley) 5/12/91
 */

/*
 * Intel 386 process control block
 */
#include "machine/tss.h"
#include "machine/npx.h"

struct pcb {
        struct  i386tss pcb_tss;
#define pcb_ksp pcb_tss.tss_esp0
#define pcb_ptd pcb_tss.tss_cr3
#define pcb_cr3 pcb_ptd
#define pcb_pc  pcb_tss.tss_eip
#define pcb_psl pcb_tss.tss_eflags
#define pcb_usp pcb_tss.tss_esp
#define pcb_fp  pcb_tss.tss_ebp
#ifdef  notyet
        u_char  pcb_iomap[NPORT/sizeof(u_char)]; /* i/o port bitmap */
#endif
        struct  save87  pcb_savefpu;    /* floating point state for 287/387 */
        struct  emcsts  pcb_saveemc;    /* Cyrix EMC state */
/*
 * Software pcb (extension)
 */
        int     pcb_flags;
#define FP_WASUSED      0x01    /* floating point has been used in this proc */
#define FP_NEEDSSAVE    0x02    /* needs save on next context switch */
#define FP_NEEDSRESTORE 0x04    /* need restore on next DNA fault */
#define FP_USESEMC      0x08    /* process uses EMC memory-mapped mode */
#define FM_TRAP         0x10    /* process entered kernel on a trap frame */
        short   pcb_iml;        /* interrupt mask level */
        caddr_t pcb_onfault;    /* copyin/out fault recovery */
        long    pcb_sigc[8];    /* XXX signal code trampoline */
        int     pcb_cmap2;      /* XXX temporary PTE - will prefault instead */
};

#ifdef KERNEL
struct pcb *curpcb;             /* our current running pcb */
#endif