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

/*-
 * Copyright (c) 1993
 *      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       8.2 (Berkeley) %G%
 */

/*
 * 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 */
};

/*
 * The pcb is augmented with machine-dependent additional data for
 * core dumps. For the i386: ???
 */
struct md_coredump {
        int     pad;            /* XXX? -- cgd */
};

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