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