1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1990 William F. Jolitz 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 36 * $FreeBSD$ 37 */ 38 39 #ifndef _MACHINE_SEGMENTS_H_ 40 #define _MACHINE_SEGMENTS_H_ 41 42 /* 43 * AMD64 Segmentation Data Structures and definitions 44 */ 45 46 #include <x86/segments.h> 47 48 /* 49 * System segment descriptors (128 bit wide) 50 */ 51 struct system_segment_descriptor { 52 u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 53 u_int64_t sd_lobase:24; /* segment base address (lsb) */ 54 u_int64_t sd_type:5; /* segment type */ 55 u_int64_t sd_dpl:2; /* segment descriptor priority level */ 56 u_int64_t sd_p:1; /* segment descriptor present */ 57 u_int64_t sd_hilimit:4; /* segment extent (msb) */ 58 u_int64_t sd_xx0:3; /* unused */ 59 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 60 u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 61 u_int64_t sd_xx1:8; 62 u_int64_t sd_mbz:5; /* MUST be zero */ 63 u_int64_t sd_xx2:19; 64 } __packed; 65 66 /* 67 * Software definitions are in this convenient format, 68 * which are translated into inconvenient segment descriptors 69 * when needed to be used by the 386 hardware 70 */ 71 72 struct soft_segment_descriptor { 73 unsigned long ssd_base; /* segment base address */ 74 unsigned long ssd_limit; /* segment extent */ 75 unsigned long ssd_type:5; /* segment type */ 76 unsigned long ssd_dpl:2; /* segment descriptor priority level */ 77 unsigned long ssd_p:1; /* segment descriptor present */ 78 unsigned long ssd_long:1; /* long mode (for %cs) */ 79 unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 80 unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 81 } __packed; 82 83 /* 84 * region descriptors, used to load gdt/idt tables before segments yet exist. 85 */ 86 struct region_descriptor { 87 uint64_t rd_limit:16; /* segment extent */ 88 uint64_t rd_base:64 __packed; /* base address */ 89 } __packed; 90 91 #ifdef _KERNEL 92 extern struct user_segment_descriptor gdt[]; 93 extern struct soft_segment_descriptor gdt_segs[]; 94 extern struct gate_descriptor *idt; 95 extern struct region_descriptor r_gdt, r_idt; 96 97 void lgdt(struct region_descriptor *rdp); 98 void sdtossd(struct user_segment_descriptor *sdp, 99 struct soft_segment_descriptor *ssdp); 100 void ssdtosd(struct soft_segment_descriptor *ssdp, 101 struct user_segment_descriptor *sdp); 102 void ssdtosyssd(struct soft_segment_descriptor *ssdp, 103 struct system_segment_descriptor *sdp); 104 void update_gdt_gsbase(struct thread *td, uint32_t base); 105 void update_gdt_fsbase(struct thread *td, uint32_t base); 106 #endif /* _KERNEL */ 107 108 #endif /* !_MACHINE_SEGMENTS_H_ */ 109