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/* 41114349Speter * AMD64 Segmentation Data Structures and definitions 424Srgrimes */ 434Srgrimes 44233203Stijl#include <x86/segments.h> 454Srgrimes 464Srgrimes/* 47114349Speter * System segment descriptors (128 bit wide) 484Srgrimes */ 49114349Speterstruct system_segment_descriptor { 50114349Speter u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 51114349Speter u_int64_t sd_lobase:24; /* segment base address (lsb) */ 52114349Speter u_int64_t sd_type:5; /* segment type */ 53114349Speter u_int64_t sd_dpl:2; /* segment descriptor priority level */ 54114349Speter u_int64_t sd_p:1; /* segment descriptor present */ 55114349Speter u_int64_t sd_hilimit:4; /* segment extent (msb) */ 56114349Speter u_int64_t sd_xx0:3; /* unused */ 57114349Speter u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 58114349Speter u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 59114349Speter u_int64_t sd_xx1:8; 60114349Speter u_int64_t sd_mbz:5; /* MUST be zero */ 61114349Speter u_int64_t sd_xx2:19; 62114349Speter} __packed; 634Srgrimes 644Srgrimes/* 654Srgrimes * Software definitions are in this convenient format, 664Srgrimes * which are translated into inconvenient segment descriptors 674Srgrimes * when needed to be used by the 386 hardware 684Srgrimes */ 694Srgrimes 70114349Speterstruct soft_segment_descriptor { 71114349Speter unsigned long ssd_base; /* segment base address */ 72114349Speter unsigned long ssd_limit; /* segment extent */ 73114349Speter unsigned long ssd_type:5; /* segment type */ 74114349Speter unsigned long ssd_dpl:2; /* segment descriptor priority level */ 75114349Speter unsigned long ssd_p:1; /* segment descriptor present */ 76114349Speter unsigned long ssd_long:1; /* long mode (for %cs) */ 77114349Speter unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 78114349Speter unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 79114349Speter} __packed; 804Srgrimes 814Srgrimes/* 824Srgrimes * region descriptors, used to load gdt/idt tables before segments yet exist. 834Srgrimes */ 844Srgrimesstruct region_descriptor { 85258660Skib uint64_t rd_limit:16; /* segment extent */ 86258660Skib uint64_t rd_base:64 __packed; /* base address */ 87114349Speter} __packed; 884Srgrimes 8955205Speter#ifdef _KERNEL 90114349Speterextern struct user_segment_descriptor gdt[]; 914501Sbdeextern struct soft_segment_descriptor gdt_segs[]; 9248005Sbdeextern struct gate_descriptor *idt; 93122849Speterextern struct region_descriptor r_gdt, r_idt; 941051Sdg 9593018Sbdevoid lgdt(struct region_descriptor *rdp); 96114349Spetervoid sdtossd(struct user_segment_descriptor *sdp, 9793018Sbde struct soft_segment_descriptor *ssdp); 9893018Sbdevoid ssdtosd(struct soft_segment_descriptor *ssdp, 99114349Speter struct user_segment_descriptor *sdp); 100114349Spetervoid ssdtosyssd(struct soft_segment_descriptor *ssdp, 101114349Speter struct system_segment_descriptor *sdp); 102190620Skibvoid update_gdt_gsbase(struct thread *td, uint32_t base); 103190620Skibvoid update_gdt_fsbase(struct thread *td, uint32_t base); 10455205Speter#endif /* _KERNEL */ 1054473Sbde 1064473Sbde#endif /* !_MACHINE_SEGMENTS_H_ */ 107