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.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)pcb.h       5.7 (Berkeley) %G%
 */

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

struct pcb {
        struct  i386tss pcbtss;
#define pcb_ksp pcbtss.tss_esp0
#define pcb_ptd pcbtss.tss_cr3
#define pcb_cr3 pcb_ptd
#define pcb_pc  pcbtss.tss_eip
#define pcb_psl pcbtss.tss_eflags
#define pcb_usp pcbtss.tss_esp
#define pcb_fp  pcbtss.tss_ebp
/*
 * Software pcb (extension)
 */
        int     pcb_flags;
#define FP_WASUSED      0x1     /* floating point has been used in this proc */
#define FP_NEEDSSAVE    0x2     /* needs save on next context switch */
#define FP_NEEDSRESTORE 0x4     /* need restore on next DNA fault */
#define FP_USESEMC      0x8     /* process uses EMC memory-mapped mode */
#define EX_TRAPSTK      0x10    /* process entered with a trap stack frame */
        struct  save87  pcb_savefpu;
        struct  emcsts  pcb_saveemc;
        struct  pte     *pcb_p0br;
        struct  pte     *pcb_p1br;
        int     pcb_p0lr;
        int     pcb_p1lr;
        int     pcb_szpt;       /* number of pages of user page table */
        int     pcb_cmap2;
        int     *pcb_sswap;
        long    pcb_sigc[8];
        int     pcb_iml;        /* interrupt mask level */
};