1/*-
  2 * SPDX-License-Identifier: BSD-3-Clause
  3 *
  4 * Copyright (c) 1989, 1990 William F. Jolitz
  5 * Copyright (c) 1990 The Regents of the University of California.
  6 * All rights reserved.
  7 *
  8 * This code is derived from software contributed to Berkeley by
  9 * William Jolitz.
 10 *
 11 * Redistribution and use in source and binary forms, with or without
 12 * modification, are permitted provided that the following conditions
 13 * are met:
 14 * 1. Redistributions of source code must retain the above copyright
 15 *    notice, this list of conditions and the following disclaimer.
 16 * 2. Redistributions in binary form must reproduce the above copyright
 17 *    notice, this list of conditions and the following disclaimer in the
 18 *    documentation and/or other materials provided with the distribution.
 19 * 3. Neither the name of the University nor the names of its contributors
 20 *    may be used to endorse or promote products derived from this software
 21 *    without specific prior written permission.
 22 *
 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 33 * SUCH DAMAGE.
 34 *
 35 *	from: @(#)segments.h	7.1 (Berkeley) 5/9/91
 36 */
 37
 38#ifdef __i386__
 39#include <i386/segments.h>
 40#else /* !__i386__ */
 41
 42#ifndef _MACHINE_SEGMENTS_H_
 43#define	_MACHINE_SEGMENTS_H_
 44
 45/*
 46 * AMD64 Segmentation Data Structures and definitions
 47 */
 48
 49#include <x86/segments.h>
 50
 51/*
 52 * System segment descriptors (128 bit wide)
 53 */
 54struct	system_segment_descriptor {
 55	u_int64_t sd_lolimit:16;	/* segment extent (lsb) */
 56	u_int64_t sd_lobase:24;		/* segment base address (lsb) */
 57	u_int64_t sd_type:5;		/* segment type */
 58	u_int64_t sd_dpl:2;		/* segment descriptor priority level */
 59	u_int64_t sd_p:1;		/* segment descriptor present */
 60	u_int64_t sd_hilimit:4;		/* segment extent (msb) */
 61	u_int64_t sd_xx0:3;		/* unused */
 62	u_int64_t sd_gran:1;		/* limit granularity (byte/page units)*/
 63	u_int64_t sd_hibase:40 __packed;/* segment base address  (msb) */
 64	u_int64_t sd_xx1:8;
 65	u_int64_t sd_mbz:5;		/* MUST be zero */
 66	u_int64_t sd_xx2:19;
 67} __packed;
 68
 69/*
 70 * Software definitions are in this convenient format,
 71 * which are translated into inconvenient segment descriptors
 72 * when needed to be used by the 386 hardware
 73 */
 74
 75struct	soft_segment_descriptor {
 76	unsigned long ssd_base;		/* segment base address  */
 77	unsigned long ssd_limit;	/* segment extent */
 78	unsigned long ssd_type:5;	/* segment type */
 79	unsigned long ssd_dpl:2;	/* segment descriptor priority level */
 80	unsigned long ssd_p:1;		/* segment descriptor present */
 81	unsigned long ssd_long:1;	/* long mode (for %cs) */
 82	unsigned long ssd_def32:1;	/* default 32 vs 16 bit size */
 83	unsigned long ssd_gran:1;	/* limit granularity (byte/page units)*/
 84} __packed;
 85
 86/*
 87 * region descriptors, used to load gdt/idt tables before segments yet exist.
 88 */
 89struct region_descriptor {
 90	uint64_t rd_limit:16;		/* segment extent */
 91	uint64_t rd_base:64 __packed;	/* base address  */
 92} __packed;
 93
 94#ifdef _KERNEL
 95extern struct soft_segment_descriptor gdt_segs[];
 96extern struct gate_descriptor *idt;
 97extern struct region_descriptor r_idt;
 98
 99void	lgdt(struct region_descriptor *rdp);
100void	sdtossd(struct user_segment_descriptor *sdp,
101	    struct soft_segment_descriptor *ssdp);
102void	ssdtosd(struct soft_segment_descriptor *ssdp,
103	    struct user_segment_descriptor *sdp);
104void	ssdtosyssd(struct soft_segment_descriptor *ssdp,
105	    struct system_segment_descriptor *sdp);
106void	update_gdt_gsbase(struct thread *td, uint32_t base);
107void	update_gdt_fsbase(struct thread *td, uint32_t base);
108#endif /* _KERNEL */
109
110#endif /* !_MACHINE_SEGMENTS_H_ */
111
112#endif /* __i386__ */