1*9c8f3233SToomas Soome /*- 2*9c8f3233SToomas Soome * Copyright (c) 1989, 1990 William F. Jolitz 3*9c8f3233SToomas Soome * Copyright (c) 1990 The Regents of the University of California. 4*9c8f3233SToomas Soome * All rights reserved. 5*9c8f3233SToomas Soome * 6*9c8f3233SToomas Soome * This code is derived from software contributed to Berkeley by 7*9c8f3233SToomas Soome * William Jolitz. 8*9c8f3233SToomas Soome * 9*9c8f3233SToomas Soome * Redistribution and use in source and binary forms, with or without 10*9c8f3233SToomas Soome * modification, are permitted provided that the following conditions 11*9c8f3233SToomas Soome * are met: 12*9c8f3233SToomas Soome * 1. Redistributions of source code must retain the above copyright 13*9c8f3233SToomas Soome * notice, this list of conditions and the following disclaimer. 14*9c8f3233SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 15*9c8f3233SToomas Soome * notice, this list of conditions and the following disclaimer in the 16*9c8f3233SToomas Soome * documentation and/or other materials provided with the distribution. 17*9c8f3233SToomas Soome * 3. Neither the name of the University nor the names of its contributors 18*9c8f3233SToomas Soome * may be used to endorse or promote products derived from this software 19*9c8f3233SToomas Soome * without specific prior written permission. 20*9c8f3233SToomas Soome * 21*9c8f3233SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22*9c8f3233SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23*9c8f3233SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*9c8f3233SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25*9c8f3233SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*9c8f3233SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27*9c8f3233SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28*9c8f3233SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29*9c8f3233SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30*9c8f3233SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31*9c8f3233SToomas Soome * SUCH DAMAGE. 32*9c8f3233SToomas Soome * 33*9c8f3233SToomas Soome * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 34*9c8f3233SToomas Soome */ 35*9c8f3233SToomas Soome 36*9c8f3233SToomas Soome #ifndef _MACHINE_SEGMENTS_H_ 37*9c8f3233SToomas Soome #define _MACHINE_SEGMENTS_H_ 38*9c8f3233SToomas Soome 39*9c8f3233SToomas Soome /* 40*9c8f3233SToomas Soome * AMD64 Segmentation Data Structures and definitions 41*9c8f3233SToomas Soome */ 42*9c8f3233SToomas Soome 43*9c8f3233SToomas Soome #include <x86/segments.h> 44*9c8f3233SToomas Soome 45*9c8f3233SToomas Soome /* 46*9c8f3233SToomas Soome * System segment descriptors (128 bit wide) 47*9c8f3233SToomas Soome */ 48*9c8f3233SToomas Soome struct system_segment_descriptor { 49*9c8f3233SToomas Soome u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 50*9c8f3233SToomas Soome u_int64_t sd_lobase:24; /* segment base address (lsb) */ 51*9c8f3233SToomas Soome u_int64_t sd_type:5; /* segment type */ 52*9c8f3233SToomas Soome u_int64_t sd_dpl:2; /* segment descriptor priority level */ 53*9c8f3233SToomas Soome u_int64_t sd_p:1; /* segment descriptor present */ 54*9c8f3233SToomas Soome u_int64_t sd_hilimit:4; /* segment extent (msb) */ 55*9c8f3233SToomas Soome u_int64_t sd_xx0:3; /* unused */ 56*9c8f3233SToomas Soome u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 57*9c8f3233SToomas Soome u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 58*9c8f3233SToomas Soome u_int64_t sd_xx1:8; 59*9c8f3233SToomas Soome u_int64_t sd_mbz:5; /* MUST be zero */ 60*9c8f3233SToomas Soome u_int64_t sd_xx2:19; 61*9c8f3233SToomas Soome } __packed; 62*9c8f3233SToomas Soome 63*9c8f3233SToomas Soome /* 64*9c8f3233SToomas Soome * Software definitions are in this convenient format, 65*9c8f3233SToomas Soome * which are translated into inconvenient segment descriptors 66*9c8f3233SToomas Soome * when needed to be used by the 386 hardware 67*9c8f3233SToomas Soome */ 68*9c8f3233SToomas Soome 69*9c8f3233SToomas Soome struct soft_segment_descriptor { 70*9c8f3233SToomas Soome unsigned long ssd_base; /* segment base address */ 71*9c8f3233SToomas Soome unsigned long ssd_limit; /* segment extent */ 72*9c8f3233SToomas Soome unsigned long ssd_type:5; /* segment type */ 73*9c8f3233SToomas Soome unsigned long ssd_dpl:2; /* segment descriptor priority level */ 74*9c8f3233SToomas Soome unsigned long ssd_p:1; /* segment descriptor present */ 75*9c8f3233SToomas Soome unsigned long ssd_long:1; /* long mode (for %cs) */ 76*9c8f3233SToomas Soome unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 77*9c8f3233SToomas Soome unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 78*9c8f3233SToomas Soome } __packed; 79*9c8f3233SToomas Soome 80*9c8f3233SToomas Soome /* 81*9c8f3233SToomas Soome * region descriptors, used to load gdt/idt tables before segments yet exist. 82*9c8f3233SToomas Soome */ 83*9c8f3233SToomas Soome struct region_descriptor { 84*9c8f3233SToomas Soome uint64_t rd_limit:16; /* segment extent */ 85*9c8f3233SToomas Soome uint64_t rd_base:64 __packed; /* base address */ 86*9c8f3233SToomas Soome } __packed; 87*9c8f3233SToomas Soome 88*9c8f3233SToomas Soome #ifdef _KERNEL 89*9c8f3233SToomas Soome extern struct user_segment_descriptor gdt[]; 90*9c8f3233SToomas Soome extern struct soft_segment_descriptor gdt_segs[]; 91*9c8f3233SToomas Soome extern struct gate_descriptor *idt; 92*9c8f3233SToomas Soome extern struct region_descriptor r_gdt, r_idt; 93*9c8f3233SToomas Soome 94*9c8f3233SToomas Soome void lgdt(struct region_descriptor *rdp); 95*9c8f3233SToomas Soome void sdtossd(struct user_segment_descriptor *sdp, 96*9c8f3233SToomas Soome struct soft_segment_descriptor *ssdp); 97*9c8f3233SToomas Soome void ssdtosd(struct soft_segment_descriptor *ssdp, 98*9c8f3233SToomas Soome struct user_segment_descriptor *sdp); 99*9c8f3233SToomas Soome void ssdtosyssd(struct soft_segment_descriptor *ssdp, 100*9c8f3233SToomas Soome struct system_segment_descriptor *sdp); 101*9c8f3233SToomas Soome void update_gdt_gsbase(struct thread *td, uint32_t base); 102*9c8f3233SToomas Soome void update_gdt_fsbase(struct thread *td, uint32_t base); 103*9c8f3233SToomas Soome #endif /* _KERNEL */ 104*9c8f3233SToomas Soome 105*9c8f3233SToomas Soome #endif /* !_MACHINE_SEGMENTS_H_ */ 106