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 */
 36
 37#ifndef _I386_PCB_H_
 38#define _I386_PCB_H_
 39
 40/*
 41 * Intel 386 process control block
 42 */
 43#ifndef _KERNEL
 44#include <machine/segments.h>
 45#endif
 46#include <machine/npx.h>
 47
 48/*
 49 * NB: The fields marked with (*) are used by kernel debuggers.  Their
 50 * ABI should be preserved.
 51 */
 52struct pcb {
 53	int	pcb_edi;	/* (*) */
 54	int	pcb_esi;	/* (*) */
 55	int	pcb_ebp;	/* (*) */
 56	int	pcb_esp;	/* (*) */
 57	int	pcb_ebx;	/* (*) */
 58	int	pcb_eip;	/* (*) */
 59	struct segment_descriptor pcb_fsd;
 60	struct segment_descriptor pcb_gsd;
 61	int	pcb_ds;
 62	int	pcb_es;
 63	int	pcb_fs;
 64	int	pcb_gs;
 65	int	pcb_ss;
 66	int	pcb_cr0;
 67	int	pcb_cr2;
 68	int	pcb_cr3;
 69	int	pcb_cr4;
 70	int     pcb_dr0;
 71	int     pcb_dr1;
 72	int     pcb_dr2;
 73	int     pcb_dr3;
 74	int     pcb_dr6;
 75	int     pcb_dr7;
 76
 77	struct region_descriptor pcb_gdt;
 78	struct region_descriptor pcb_idt;
 79	uint16_t	pcb_ldt;
 80	uint16_t	pcb_tr;
 81
 82	u_int	pcb_flags;
 83#define	PCB_DBREGS	0x02	/* process using debug registers */
 84#define	PCB_KERNNPX_THR	0x04	/* fpu_kern_thread() */
 85#define	PCB_NPXINITDONE	0x08	/* fpu state is initialized */
 86#define	PCB_VM86CALL	0x10	/* in vm86 call */
 87#define	PCB_NPXUSERINITDONE 0x20 /* user fpu state is initialized */
 88#define	PCB_KERNNPX	0x40	/* kernel uses npx */
 89#define	PCB_NPXNOSAVE	0x80	/* no save area for current FPU ctx */
 90
 91	uint16_t pcb_initial_npxcw;
 92
 93	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
 94	struct	pcb_ext	*pcb_ext;	/* optional pcb extension */
 95	int	pcb_waspsl;	/* unused padding for ABI and API compat */
 96	u_long	pcb_vm86[2];	/* vm86bios scratch space */
 97	union	savefpu *pcb_save;
 98
 99	uint32_t pcb_pad[10];
100};
101
102/* Per-CPU state saved during suspend and resume. */
103struct susppcb {
104	struct pcb	sp_pcb;
105
106	/* fpu context for suspend/resume */
107	void		*sp_fpususpend;
108};
109
110#ifdef _KERNEL
111struct trapframe;
112
113void	makectx(struct trapframe *, struct pcb *);
114int	savectx(struct pcb *) __returns_twice;
115void	resumectx(struct pcb *) __fastcall;
116#endif
117
118#endif /* _I386_PCB_H_ */