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: head/sys/i386/include/segments.h 233203 2012-03-19 21:24:50Z tijl $
35 */
36
37#ifndef _MACHINE_SEGMENTS_H_
38#define _MACHINE_SEGMENTS_H_
39
40/*
41 * 386 Segmentation Data Structures and definitions
42 * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
43 */
44
45#include <x86/segments.h>
46
47/*
48 * Software definitions are in this convenient format,
49 * which are translated into inconvenient segment descriptors
50 * when needed to be used by the 386 hardware
51 */
52
53struct soft_segment_descriptor {
54 unsigned ssd_base ; /* segment base address */
55 unsigned ssd_limit ; /* segment extent */
56 unsigned ssd_type:5 ; /* segment type */
57 unsigned ssd_dpl:2 ; /* segment descriptor priority level */
58 unsigned ssd_p:1 ; /* segment descriptor present */
59 unsigned ssd_xx:4 ; /* unused */
60 unsigned ssd_xx1:2 ; /* unused */
61 unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
62 unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
63};
64
65/*
66 * region descriptors, used to load gdt/idt tables before segments yet exist.
67 */
68struct region_descriptor {
69 unsigned rd_limit:16; /* segment extent */
70 unsigned rd_base:32 __packed; /* base address */
71};
72
73/*
74 * Segment Protection Exception code bits
75 */
76
77#define SEGEX_EXT 0x01 /* recursive or externally induced */
78#define SEGEX_IDT 0x02 /* interrupt descriptor table */
79#define SEGEX_TI 0x04 /* local descriptor table */
80 /* other bits are affected descriptor index */
81#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
82
83#ifdef _KERNEL
84extern int _default_ldt;
85#ifdef XEN
86extern struct proc_ldt default_proc_ldt;
87extern union descriptor *gdt;
88extern union descriptor *ldt;
89#else
90extern union descriptor gdt[];
91extern union descriptor ldt[NLDT];
92#endif
93extern struct soft_segment_descriptor gdt_segs[];
94extern struct gate_descriptor *idt;
95extern struct region_descriptor r_gdt, r_idt;
96
97void lgdt(struct region_descriptor *rdp);
98void sdtossd(struct segment_descriptor *sdp,
99 struct soft_segment_descriptor *ssdp);
100void ssdtosd(struct soft_segment_descriptor *ssdp,
101 struct segment_descriptor *sdp);
102#endif /* _KERNEL */
103
104#endif /* !_MACHINE_SEGMENTS_H_ */
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: head/sys/i386/include/segments.h 233203 2012-03-19 21:24:50Z tijl $
35 */
36
37#ifndef _MACHINE_SEGMENTS_H_
38#define _MACHINE_SEGMENTS_H_
39
40/*
41 * 386 Segmentation Data Structures and definitions
42 * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
43 */
44
45#include <x86/segments.h>
46
47/*
48 * Software definitions are in this convenient format,
49 * which are translated into inconvenient segment descriptors
50 * when needed to be used by the 386 hardware
51 */
52
53struct soft_segment_descriptor {
54 unsigned ssd_base ; /* segment base address */
55 unsigned ssd_limit ; /* segment extent */
56 unsigned ssd_type:5 ; /* segment type */
57 unsigned ssd_dpl:2 ; /* segment descriptor priority level */
58 unsigned ssd_p:1 ; /* segment descriptor present */
59 unsigned ssd_xx:4 ; /* unused */
60 unsigned ssd_xx1:2 ; /* unused */
61 unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
62 unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
63};
64
65/*
66 * region descriptors, used to load gdt/idt tables before segments yet exist.
67 */
68struct region_descriptor {
69 unsigned rd_limit:16; /* segment extent */
70 unsigned rd_base:32 __packed; /* base address */
71};
72
73/*
74 * Segment Protection Exception code bits
75 */
76
77#define SEGEX_EXT 0x01 /* recursive or externally induced */
78#define SEGEX_IDT 0x02 /* interrupt descriptor table */
79#define SEGEX_TI 0x04 /* local descriptor table */
80 /* other bits are affected descriptor index */
81#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
82
83#ifdef _KERNEL
84extern int _default_ldt;
85#ifdef XEN
86extern struct proc_ldt default_proc_ldt;
87extern union descriptor *gdt;
88extern union descriptor *ldt;
89#else
90extern union descriptor gdt[];
91extern union descriptor ldt[NLDT];
92#endif
93extern struct soft_segment_descriptor gdt_segs[];
94extern struct gate_descriptor *idt;
95extern struct region_descriptor r_gdt, r_idt;
96
97void lgdt(struct region_descriptor *rdp);
98void sdtossd(struct segment_descriptor *sdp,
99 struct soft_segment_descriptor *ssdp);
100void ssdtosd(struct soft_segment_descriptor *ssdp,
101 struct segment_descriptor *sdp);
102#endif /* _KERNEL */
103
104#endif /* !_MACHINE_SEGMENTS_H_ */