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