1a9643ea8Slogwang /*- 2*22ce4affSfengbojiang * SPDX-License-Identifier: BSD-3-Clause 3*22ce4affSfengbojiang * 4a9643ea8Slogwang * Copyright (c) 1989, 1990 William F. Jolitz 5a9643ea8Slogwang * Copyright (c) 1990 The Regents of the University of California. 6a9643ea8Slogwang * All rights reserved. 7a9643ea8Slogwang * 8a9643ea8Slogwang * This code is derived from software contributed to Berkeley by 9a9643ea8Slogwang * William Jolitz. 10a9643ea8Slogwang * 11a9643ea8Slogwang * Redistribution and use in source and binary forms, with or without 12a9643ea8Slogwang * modification, are permitted provided that the following conditions 13a9643ea8Slogwang * are met: 14a9643ea8Slogwang * 1. Redistributions of source code must retain the above copyright 15a9643ea8Slogwang * notice, this list of conditions and the following disclaimer. 16a9643ea8Slogwang * 2. Redistributions in binary form must reproduce the above copyright 17a9643ea8Slogwang * notice, this list of conditions and the following disclaimer in the 18a9643ea8Slogwang * documentation and/or other materials provided with the distribution. 19*22ce4affSfengbojiang * 3. Neither the name of the University nor the names of its contributors 20a9643ea8Slogwang * may be used to endorse or promote products derived from this software 21a9643ea8Slogwang * without specific prior written permission. 22a9643ea8Slogwang * 23a9643ea8Slogwang * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24a9643ea8Slogwang * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25a9643ea8Slogwang * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26a9643ea8Slogwang * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27a9643ea8Slogwang * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28a9643ea8Slogwang * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29a9643ea8Slogwang * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30a9643ea8Slogwang * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31a9643ea8Slogwang * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32a9643ea8Slogwang * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33a9643ea8Slogwang * SUCH DAMAGE. 34a9643ea8Slogwang * 35a9643ea8Slogwang * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 36a9643ea8Slogwang * $FreeBSD$ 37a9643ea8Slogwang */ 38a9643ea8Slogwang 39a9643ea8Slogwang #ifndef _MACHINE_SEGMENTS_H_ 40a9643ea8Slogwang #define _MACHINE_SEGMENTS_H_ 41a9643ea8Slogwang 42a9643ea8Slogwang /* 43a9643ea8Slogwang * AMD64 Segmentation Data Structures and definitions 44a9643ea8Slogwang */ 45a9643ea8Slogwang 46a9643ea8Slogwang #include <x86/segments.h> 47a9643ea8Slogwang 48a9643ea8Slogwang /* 49a9643ea8Slogwang * System segment descriptors (128 bit wide) 50a9643ea8Slogwang */ 51a9643ea8Slogwang struct system_segment_descriptor { 52a9643ea8Slogwang u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 53a9643ea8Slogwang u_int64_t sd_lobase:24; /* segment base address (lsb) */ 54a9643ea8Slogwang u_int64_t sd_type:5; /* segment type */ 55a9643ea8Slogwang u_int64_t sd_dpl:2; /* segment descriptor priority level */ 56a9643ea8Slogwang u_int64_t sd_p:1; /* segment descriptor present */ 57a9643ea8Slogwang u_int64_t sd_hilimit:4; /* segment extent (msb) */ 58a9643ea8Slogwang u_int64_t sd_xx0:3; /* unused */ 59a9643ea8Slogwang u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 60a9643ea8Slogwang u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 61a9643ea8Slogwang u_int64_t sd_xx1:8; 62a9643ea8Slogwang u_int64_t sd_mbz:5; /* MUST be zero */ 63a9643ea8Slogwang u_int64_t sd_xx2:19; 64a9643ea8Slogwang } __packed; 65a9643ea8Slogwang 66a9643ea8Slogwang /* 67a9643ea8Slogwang * Software definitions are in this convenient format, 68a9643ea8Slogwang * which are translated into inconvenient segment descriptors 69a9643ea8Slogwang * when needed to be used by the 386 hardware 70a9643ea8Slogwang */ 71a9643ea8Slogwang 72a9643ea8Slogwang struct soft_segment_descriptor { 73a9643ea8Slogwang unsigned long ssd_base; /* segment base address */ 74a9643ea8Slogwang unsigned long ssd_limit; /* segment extent */ 75a9643ea8Slogwang unsigned long ssd_type:5; /* segment type */ 76a9643ea8Slogwang unsigned long ssd_dpl:2; /* segment descriptor priority level */ 77a9643ea8Slogwang unsigned long ssd_p:1; /* segment descriptor present */ 78a9643ea8Slogwang unsigned long ssd_long:1; /* long mode (for %cs) */ 79a9643ea8Slogwang unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 80a9643ea8Slogwang unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 81a9643ea8Slogwang } __packed; 82a9643ea8Slogwang 83a9643ea8Slogwang /* 84a9643ea8Slogwang * region descriptors, used to load gdt/idt tables before segments yet exist. 85a9643ea8Slogwang */ 86a9643ea8Slogwang struct region_descriptor { 87a9643ea8Slogwang uint64_t rd_limit:16; /* segment extent */ 88a9643ea8Slogwang uint64_t rd_base:64 __packed; /* base address */ 89a9643ea8Slogwang } __packed; 90a9643ea8Slogwang 91a9643ea8Slogwang #ifdef _KERNEL 92a9643ea8Slogwang extern struct soft_segment_descriptor gdt_segs[]; 93a9643ea8Slogwang extern struct gate_descriptor *idt; 94*22ce4affSfengbojiang extern struct region_descriptor r_idt; 95a9643ea8Slogwang 96a9643ea8Slogwang void lgdt(struct region_descriptor *rdp); 97a9643ea8Slogwang void sdtossd(struct user_segment_descriptor *sdp, 98a9643ea8Slogwang struct soft_segment_descriptor *ssdp); 99a9643ea8Slogwang void ssdtosd(struct soft_segment_descriptor *ssdp, 100a9643ea8Slogwang struct user_segment_descriptor *sdp); 101a9643ea8Slogwang void ssdtosyssd(struct soft_segment_descriptor *ssdp, 102a9643ea8Slogwang struct system_segment_descriptor *sdp); 103a9643ea8Slogwang void update_gdt_gsbase(struct thread *td, uint32_t base); 104a9643ea8Slogwang void update_gdt_fsbase(struct thread *td, uint32_t base); 105a9643ea8Slogwang #endif /* _KERNEL */ 106a9643ea8Slogwang 107a9643ea8Slogwang #endif /* !_MACHINE_SEGMENTS_H_ */ 108