pcb.h revision 4 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	@(#)pcb.h	5.10 (Berkeley) 5/12/91
37 *
38 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
39 * --------------------         -----   ----------------------
40 * CURRENT PATCH LEVEL:         1       00154
41 * --------------------         -----   ----------------------
42 *
43 * 20 Apr 93	Bruce Evans		New npx-0.5 code
44 *
45 */
46
47/*
48 * Intel 386 process control block
49 */
50#include "machine/tss.h"
51#include "machine/npx.h"
52
53struct pcb {
54	struct	i386tss pcb_tss;
55#define	pcb_ksp	pcb_tss.tss_esp0
56#define	pcb_ptd	pcb_tss.tss_cr3
57#define	pcb_cr3	pcb_ptd
58#define	pcb_pc	pcb_tss.tss_eip
59#define	pcb_psl	pcb_tss.tss_eflags
60#define	pcb_usp	pcb_tss.tss_esp
61#define	pcb_fp	pcb_tss.tss_ebp
62#ifdef	notyet
63	u_char	pcb_iomap[NPORT/sizeof(u_char)]; /* i/o port bitmap */
64#endif
65	struct	save87	pcb_savefpu;	/* floating point state for 287/387 */
66	struct	emcsts	pcb_saveemc;	/* Cyrix EMC state */
67/*
68 * Software pcb (extension)
69 */
70	int	pcb_flags;
71#ifdef notused
72#define	FP_WASUSED	0x01	/* process has used fltng pnt hardware */
73#define	FP_NEEDSSAVE	0x02	/* ... that needs save on next context switch */
74#define	FP_NEEDSRESTORE	0x04	/* ... that needs restore on next DNA fault */
75#endif
76#define	FP_USESEMC	0x08	/* process uses EMC memory-mapped mode */
77#define	FM_TRAP		0x10	/* process entered kernel on a trap frame */
78#define	FP_SOFTFP	0x20	/* process using software fltng pnt emulator */
79	short	pcb_iml;	/* interrupt mask level */
80	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
81	long	pcb_sigc[8];	/* XXX signal code trampoline */
82	int	pcb_cmap2;	/* XXX temporary PTE - will prefault instead */
83};
84
85#ifdef KERNEL
86struct pcb *curpcb;		/* our current running pcb */
87#endif
88