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