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
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34 * $FreeBSD: head/sys/i386/include/segments.h 233203 2012-03-19 21:24:50Z tijl $
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34 * $FreeBSD: head/sys/i386/include/segments.h 282274 2015-04-30 15:48:48Z jhb $ |
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;
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85#ifdef XEN
86extern struct proc_ldt default_proc_ldt;
87extern union descriptor *gdt;
88extern union descriptor *ldt;
89#else
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85extern union descriptor gdt[]; 86extern union descriptor ldt[NLDT];
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92#endif
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87extern struct soft_segment_descriptor gdt_segs[]; 88extern struct gate_descriptor *idt; 89extern struct region_descriptor r_gdt, r_idt; 90 91void lgdt(struct region_descriptor *rdp); 92void sdtossd(struct segment_descriptor *sdp, 93 struct soft_segment_descriptor *ssdp); 94void ssdtosd(struct soft_segment_descriptor *ssdp, 95 struct segment_descriptor *sdp); 96#endif /* _KERNEL */ 97 98#endif /* !_MACHINE_SEGMENTS_H_ */
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