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 */ 35 36 #ifndef _MACHINE_SEGMENTS_H_ 37 #define _MACHINE_SEGMENTS_H_ 38 39 /* 40 * AMD64 Segmentation Data Structures and definitions 41 */ 42 43 #include <x86/segments.h> 44 45 /* 46 * System segment descriptors (128 bit wide) 47 */ 48 struct system_segment_descriptor { 49 u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 50 u_int64_t sd_lobase:24; /* segment base address (lsb) */ 51 u_int64_t sd_type:5; /* segment type */ 52 u_int64_t sd_dpl:2; /* segment descriptor priority level */ 53 u_int64_t sd_p:1; /* segment descriptor present */ 54 u_int64_t sd_hilimit:4; /* segment extent (msb) */ 55 u_int64_t sd_xx0:3; /* unused */ 56 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 57 u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 58 u_int64_t sd_xx1:8; 59 u_int64_t sd_mbz:5; /* MUST be zero */ 60 u_int64_t sd_xx2:19; 61 } __packed; 62 63 /* 64 * Software definitions are in this convenient format, 65 * which are translated into inconvenient segment descriptors 66 * when needed to be used by the 386 hardware 67 */ 68 69 struct soft_segment_descriptor { 70 unsigned long ssd_base; /* segment base address */ 71 unsigned long ssd_limit; /* segment extent */ 72 unsigned long ssd_type:5; /* segment type */ 73 unsigned long ssd_dpl:2; /* segment descriptor priority level */ 74 unsigned long ssd_p:1; /* segment descriptor present */ 75 unsigned long ssd_long:1; /* long mode (for %cs) */ 76 unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 77 unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 78 } __packed; 79 80 /* 81 * region descriptors, used to load gdt/idt tables before segments yet exist. 82 */ 83 struct region_descriptor { 84 uint64_t rd_limit:16; /* segment extent */ 85 uint64_t rd_base:64 __packed; /* base address */ 86 } __packed; 87 88 #ifdef _KERNEL 89 extern struct user_segment_descriptor gdt[]; 90 extern struct soft_segment_descriptor gdt_segs[]; 91 extern struct gate_descriptor *idt; 92 extern struct region_descriptor r_gdt, r_idt; 93 94 void lgdt(struct region_descriptor *rdp); 95 void sdtossd(struct user_segment_descriptor *sdp, 96 struct soft_segment_descriptor *ssdp); 97 void ssdtosd(struct soft_segment_descriptor *ssdp, 98 struct user_segment_descriptor *sdp); 99 void ssdtosyssd(struct soft_segment_descriptor *ssdp, 100 struct system_segment_descriptor *sdp); 101 void update_gdt_gsbase(struct thread *td, uint32_t base); 102 void update_gdt_fsbase(struct thread *td, uint32_t base); 103 #endif /* _KERNEL */ 104 105 #endif /* !_MACHINE_SEGMENTS_H_ */ 106