fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
99 lines
3.6 KiB
C
99 lines
3.6 KiB
C
/*-
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* Copyright (c) 1989, 1990 William F. Jolitz
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SEGMENTS_H_
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#define _MACHINE_SEGMENTS_H_
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/*
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* 386 Segmentation Data Structures and definitions
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* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
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*/
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#include <x86/segments.h>
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/*
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* Software definitions are in this convenient format,
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* which are translated into inconvenient segment descriptors
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* when needed to be used by the 386 hardware
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*/
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struct soft_segment_descriptor {
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unsigned ssd_base ; /* segment base address */
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unsigned ssd_limit ; /* segment extent */
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unsigned ssd_type:5 ; /* segment type */
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unsigned ssd_dpl:2 ; /* segment descriptor priority level */
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unsigned ssd_p:1 ; /* segment descriptor present */
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unsigned ssd_xx:4 ; /* unused */
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unsigned ssd_xx1:2 ; /* unused */
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unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
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unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
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};
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/*
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* region descriptors, used to load gdt/idt tables before segments yet exist.
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*/
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struct region_descriptor {
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unsigned rd_limit:16; /* segment extent */
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unsigned rd_base:32 __packed; /* base address */
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};
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/*
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* Segment Protection Exception code bits
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*/
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#define SEGEX_EXT 0x01 /* recursive or externally induced */
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#define SEGEX_IDT 0x02 /* interrupt descriptor table */
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#define SEGEX_TI 0x04 /* local descriptor table */
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/* other bits are affected descriptor index */
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#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
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#ifdef _KERNEL
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extern int _default_ldt;
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extern union descriptor gdt[];
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extern union descriptor ldt[NLDT];
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extern struct soft_segment_descriptor gdt_segs[];
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extern struct gate_descriptor *idt;
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extern struct region_descriptor r_gdt, r_idt;
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void lgdt(struct region_descriptor *rdp);
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void sdtossd(struct segment_descriptor *sdp,
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struct soft_segment_descriptor *ssdp);
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void ssdtosd(struct soft_segment_descriptor *ssdp,
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struct segment_descriptor *sdp);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_SEGMENTS_H_ */
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