14Srgrimes/*- 24Srgrimes * Copyright (c) 1989, 1990 William F. Jolitz 34Srgrimes * Copyright (c) 1990 The Regents of the University of California. 44Srgrimes * All rights reserved. 54Srgrimes * 64Srgrimes * This code is derived from software contributed to Berkeley by 74Srgrimes * William Jolitz. 84Srgrimes * 94Srgrimes * Redistribution and use in source and binary forms, with or without 104Srgrimes * modification, are permitted provided that the following conditions 114Srgrimes * are met: 124Srgrimes * 1. Redistributions of source code must retain the above copyright 134Srgrimes * notice, this list of conditions and the following disclaimer. 144Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 154Srgrimes * notice, this list of conditions and the following disclaimer in the 164Srgrimes * documentation and/or other materials provided with the distribution. 174Srgrimes * 4. Neither the name of the University nor the names of its contributors 184Srgrimes * may be used to endorse or promote products derived from this software 194Srgrimes * without specific prior written permission. 204Srgrimes * 214Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 224Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 234Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 244Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 254Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 264Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 274Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 284Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 294Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 304Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 314Srgrimes * SUCH DAMAGE. 324Srgrimes * 33621Srgrimes * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 3450477Speter * $FreeBSD$ 354Srgrimes */ 364Srgrimes 37719Swollman#ifndef _MACHINE_SEGMENTS_H_ 384501Sbde#define _MACHINE_SEGMENTS_H_ 39719Swollman 404Srgrimes/* 414Srgrimes * 386 Segmentation Data Structures and definitions 424Srgrimes * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989 434Srgrimes */ 444Srgrimes 45233203Stijl#include <x86/segments.h> 464Srgrimes 474Srgrimes/* 484Srgrimes * Software definitions are in this convenient format, 494Srgrimes * which are translated into inconvenient segment descriptors 504Srgrimes * when needed to be used by the 386 hardware 514Srgrimes */ 524Srgrimes 534Srgrimesstruct soft_segment_descriptor { 544Srgrimes unsigned ssd_base ; /* segment base address */ 554Srgrimes unsigned ssd_limit ; /* segment extent */ 564Srgrimes unsigned ssd_type:5 ; /* segment type */ 574Srgrimes unsigned ssd_dpl:2 ; /* segment descriptor priority level */ 584Srgrimes unsigned ssd_p:1 ; /* segment descriptor present */ 594Srgrimes unsigned ssd_xx:4 ; /* unused */ 604Srgrimes unsigned ssd_xx1:2 ; /* unused */ 614Srgrimes unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */ 624Srgrimes unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/ 634Srgrimes}; 644Srgrimes 654Srgrimes/* 664Srgrimes * region descriptors, used to load gdt/idt tables before segments yet exist. 674Srgrimes */ 684Srgrimesstruct region_descriptor { 69103847Speter unsigned rd_limit:16; /* segment extent */ 70103847Speter unsigned rd_base:32 __packed; /* base address */ 714Srgrimes}; 724Srgrimes 734Srgrimes/* 744Srgrimes * Segment Protection Exception code bits 754Srgrimes */ 764Srgrimes 774Srgrimes#define SEGEX_EXT 0x01 /* recursive or externally induced */ 784Srgrimes#define SEGEX_IDT 0x02 /* interrupt descriptor table */ 794Srgrimes#define SEGEX_TI 0x04 /* local descriptor table */ 804Srgrimes /* other bits are affected descriptor index */ 8187311Sjhb#define SEGEX_IDX(s) (((s)>>3)&0x1fff) 824Srgrimes 8355205Speter#ifdef _KERNEL 844501Sbdeextern int _default_ldt; 8525164Speterextern union descriptor gdt[]; 86181775Skmacyextern union descriptor ldt[NLDT]; 874501Sbdeextern struct soft_segment_descriptor gdt_segs[]; 8848005Sbdeextern struct gate_descriptor *idt; 89121754Sjhbextern struct region_descriptor r_gdt, r_idt; 901051Sdg 9193018Sbdevoid lgdt(struct region_descriptor *rdp); 9293018Sbdevoid sdtossd(struct segment_descriptor *sdp, 9393018Sbde struct soft_segment_descriptor *ssdp); 9493018Sbdevoid ssdtosd(struct soft_segment_descriptor *ssdp, 9593018Sbde struct segment_descriptor *sdp); 9655205Speter#endif /* _KERNEL */ 974473Sbde 984473Sbde#endif /* !_MACHINE_SEGMENTS_H_ */ 99