a7af4a3e7d
Reviewed by: jhb, markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D22302
108 lines
4.1 KiB
C
108 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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 soft_segment_descriptor gdt_segs[];
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extern struct gate_descriptor *idt;
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extern struct region_descriptor 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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