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