xref: /freebsd/sys/i386/include/pcb.h (revision f5147e312f43a9050468de539aeafa072caa1a60)
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  */
53 struct 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_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 
90 	uint16_t pcb_initial_npxcw;
91 
92 	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
93 	struct	pcb_ext	*pcb_ext;	/* optional pcb extension */
94 	int	pcb_waspsl;	/* unused padding for ABI and API compat */
95 	u_long	pcb_vm86[2];	/* vm86bios scratch space */
96 	union	savefpu *pcb_save;
97 
98 	uint32_t pcb_pad[10];
99 };
100 
101 /* Per-CPU state saved during suspend and resume. */
102 struct susppcb {
103 	struct pcb	sp_pcb;
104 
105 	/* fpu context for suspend/resume */
106 	void		*sp_fpususpend;
107 };
108 
109 #ifdef _KERNEL
110 struct trapframe;
111 
112 void	makectx(struct trapframe *, struct pcb *);
113 int	savectx(struct pcb *) __returns_twice;
114 void	resumectx(struct pcb *) __fastcall;
115 #endif
116 
117 #endif /* _I386_PCB_H_ */
118