fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
107 lines
4.1 KiB
C
107 lines
4.1 KiB
C
/*-
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* Copyright (c) 1989, 1990 William F. Jolitz
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SEGMENTS_H_
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#define _MACHINE_SEGMENTS_H_
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/*
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* AMD64 Segmentation Data Structures and definitions
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*/
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#include <x86/segments.h>
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/*
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* System segment descriptors (128 bit wide)
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*/
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struct system_segment_descriptor {
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u_int64_t sd_lolimit:16; /* segment extent (lsb) */
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u_int64_t sd_lobase:24; /* segment base address (lsb) */
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u_int64_t sd_type:5; /* segment type */
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u_int64_t sd_dpl:2; /* segment descriptor priority level */
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u_int64_t sd_p:1; /* segment descriptor present */
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u_int64_t sd_hilimit:4; /* segment extent (msb) */
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u_int64_t sd_xx0:3; /* unused */
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u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
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u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */
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u_int64_t sd_xx1:8;
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u_int64_t sd_mbz:5; /* MUST be zero */
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u_int64_t sd_xx2:19;
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} __packed;
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/*
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* Software definitions are in this convenient format,
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* which are translated into inconvenient segment descriptors
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* when needed to be used by the 386 hardware
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*/
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struct soft_segment_descriptor {
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unsigned long ssd_base; /* segment base address */
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unsigned long ssd_limit; /* segment extent */
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unsigned long ssd_type:5; /* segment type */
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unsigned long ssd_dpl:2; /* segment descriptor priority level */
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unsigned long ssd_p:1; /* segment descriptor present */
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unsigned long ssd_long:1; /* long mode (for %cs) */
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unsigned long ssd_def32:1; /* default 32 vs 16 bit size */
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unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/
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} __packed;
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/*
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* region descriptors, used to load gdt/idt tables before segments yet exist.
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*/
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struct region_descriptor {
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uint64_t rd_limit:16; /* segment extent */
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uint64_t rd_base:64 __packed; /* base address */
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} __packed;
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#ifdef _KERNEL
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extern struct user_segment_descriptor gdt[];
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extern struct soft_segment_descriptor gdt_segs[];
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extern struct gate_descriptor *idt;
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extern struct region_descriptor r_gdt, r_idt;
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void lgdt(struct region_descriptor *rdp);
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void sdtossd(struct user_segment_descriptor *sdp,
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struct soft_segment_descriptor *ssdp);
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void ssdtosd(struct soft_segment_descriptor *ssdp,
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struct user_segment_descriptor *sdp);
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void ssdtosyssd(struct soft_segment_descriptor *ssdp,
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struct system_segment_descriptor *sdp);
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void update_gdt_gsbase(struct thread *td, uint32_t base);
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void update_gdt_fsbase(struct thread *td, uint32_t base);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_SEGMENTS_H_ */
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