1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	from: @(#)pcb.h	5.10 (Berkeley) 5/12/91
35 * $FreeBSD$
36 */
37
38#ifndef _I386_PCB_H_
39#define _I386_PCB_H_
40
41/*
42 * Intel 386 process control block
43 */
44#ifndef _KERNEL
45#include <machine/segments.h>
46#endif
47#include <machine/npx.h>
48
49/*
50 * NB: The fields marked with (*) are used by kernel debuggers.  Their
51 * ABI should be preserved.
52 */
53struct pcb {
54	int	pcb_edi;	/* (*) */
55	int	pcb_esi;	/* (*) */
56	int	pcb_ebp;	/* (*) */
57	int	pcb_esp;	/* (*) */
58	int	pcb_ebx;	/* (*) */
59	int	pcb_eip;	/* (*) */
60	struct segment_descriptor pcb_fsd;
61	struct segment_descriptor pcb_gsd;
62	int	pcb_ds;
63	int	pcb_es;
64	int	pcb_fs;
65	int	pcb_gs;
66	int	pcb_ss;
67	int	pcb_cr0;
68	int	pcb_cr2;
69	int	pcb_cr3;
70	int	pcb_cr4;
71	int     pcb_dr0;
72	int     pcb_dr1;
73	int     pcb_dr2;
74	int     pcb_dr3;
75	int     pcb_dr6;
76	int     pcb_dr7;
77
78	struct region_descriptor pcb_gdt;
79	struct region_descriptor pcb_idt;
80	uint16_t	pcb_ldt;
81	uint16_t	pcb_tr;
82
83	u_int	pcb_flags;
84#define	PCB_DBREGS	0x02	/* process using debug registers */
85#define	PCB_KERNNPX_THR	0x04	/* fpu_kern_thread() */
86#define	PCB_NPXINITDONE	0x08	/* fpu state is initialized */
87#define	PCB_VM86CALL	0x10	/* in vm86 call */
88#define	PCB_NPXUSERINITDONE 0x20 /* user fpu state is initialized */
89#define	PCB_KERNNPX	0x40	/* kernel uses npx */
90#define	PCB_NPXNOSAVE	0x80	/* no save area for current FPU ctx */
91
92	uint16_t pcb_initial_npxcw;
93
94	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
95	struct	pcb_ext	*pcb_ext;	/* optional pcb extension */
96	int	pcb_waspsl;	/* unused padding for ABI and API compat */
97	u_long	pcb_vm86[2];	/* vm86bios scratch space */
98	union	savefpu *pcb_save;
99
100	uint32_t pcb_pad[10];
101};
102
103/* Per-CPU state saved during suspend and resume. */
104struct susppcb {
105	struct pcb	sp_pcb;
106
107	/* fpu context for suspend/resume */
108	void		*sp_fpususpend;
109};
110
111#ifdef _KERNEL
112struct trapframe;
113
114void	makectx(struct trapframe *, struct pcb *);
115int	savectx(struct pcb *) __returns_twice;
116void	resumectx(struct pcb *) __fastcall;
117#endif
118
119#endif /* _I386_PCB_H_ */
120