1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1990 William F. Jolitz
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	from: @(#)segments.h	7.1 (Berkeley) 5/9/91
36 * $FreeBSD$
37 */
38
39#ifndef _MACHINE_SEGMENTS_H_
40#define	_MACHINE_SEGMENTS_H_
41
42/*
43 * AMD64 Segmentation Data Structures and definitions
44 */
45
46#include <x86/segments.h>
47
48/*
49 * System segment descriptors (128 bit wide)
50 */
51struct	system_segment_descriptor {
52	u_int64_t sd_lolimit:16;	/* segment extent (lsb) */
53	u_int64_t sd_lobase:24;		/* segment base address (lsb) */
54	u_int64_t sd_type:5;		/* segment type */
55	u_int64_t sd_dpl:2;		/* segment descriptor priority level */
56	u_int64_t sd_p:1;		/* segment descriptor present */
57	u_int64_t sd_hilimit:4;		/* segment extent (msb) */
58	u_int64_t sd_xx0:3;		/* unused */
59	u_int64_t sd_gran:1;		/* limit granularity (byte/page units)*/
60	u_int64_t sd_hibase:40 __packed;/* segment base address  (msb) */
61	u_int64_t sd_xx1:8;
62	u_int64_t sd_mbz:5;		/* MUST be zero */
63	u_int64_t sd_xx2:19;
64} __packed;
65
66/*
67 * Software definitions are in this convenient format,
68 * which are translated into inconvenient segment descriptors
69 * when needed to be used by the 386 hardware
70 */
71
72struct	soft_segment_descriptor {
73	unsigned long ssd_base;		/* segment base address  */
74	unsigned long ssd_limit;	/* segment extent */
75	unsigned long ssd_type:5;	/* segment type */
76	unsigned long ssd_dpl:2;	/* segment descriptor priority level */
77	unsigned long ssd_p:1;		/* segment descriptor present */
78	unsigned long ssd_long:1;	/* long mode (for %cs) */
79	unsigned long ssd_def32:1;	/* default 32 vs 16 bit size */
80	unsigned long ssd_gran:1;	/* limit granularity (byte/page units)*/
81} __packed;
82
83/*
84 * region descriptors, used to load gdt/idt tables before segments yet exist.
85 */
86struct region_descriptor {
87	uint64_t rd_limit:16;		/* segment extent */
88	uint64_t rd_base:64 __packed;	/* base address  */
89} __packed;
90
91#ifdef _KERNEL
92extern struct soft_segment_descriptor gdt_segs[];
93extern struct gate_descriptor *idt;
94extern struct region_descriptor r_idt;
95
96void	lgdt(struct region_descriptor *rdp);
97void	sdtossd(struct user_segment_descriptor *sdp,
98	    struct soft_segment_descriptor *ssdp);
99void	ssdtosd(struct soft_segment_descriptor *ssdp,
100	    struct user_segment_descriptor *sdp);
101void	ssdtosyssd(struct soft_segment_descriptor *ssdp,
102	    struct system_segment_descriptor *sdp);
103void	update_gdt_gsbase(struct thread *td, uint32_t base);
104void	update_gdt_fsbase(struct thread *td, uint32_t base);
105#endif /* _KERNEL */
106
107#endif /* !_MACHINE_SEGMENTS_H_ */
108