bcde3b9f67
segments.h to a new x86 segments.h. Add __packed attribute to some structs (just to be sure). Also make it clear that i386 GDT and LDT entries are used in ia64 code.
105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/*-
|
|
* Copyright (c) 1989, 1990 William F. Jolitz
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* William Jolitz.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_SEGMENTS_H_
|
|
#define _MACHINE_SEGMENTS_H_
|
|
|
|
/*
|
|
* 386 Segmentation Data Structures and definitions
|
|
* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
|
|
*/
|
|
|
|
#include <x86/segments.h>
|
|
|
|
/*
|
|
* Software definitions are in this convenient format,
|
|
* which are translated into inconvenient segment descriptors
|
|
* when needed to be used by the 386 hardware
|
|
*/
|
|
|
|
struct soft_segment_descriptor {
|
|
unsigned ssd_base ; /* segment base address */
|
|
unsigned ssd_limit ; /* segment extent */
|
|
unsigned ssd_type:5 ; /* segment type */
|
|
unsigned ssd_dpl:2 ; /* segment descriptor priority level */
|
|
unsigned ssd_p:1 ; /* segment descriptor present */
|
|
unsigned ssd_xx:4 ; /* unused */
|
|
unsigned ssd_xx1:2 ; /* unused */
|
|
unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
|
|
unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
|
|
};
|
|
|
|
/*
|
|
* region descriptors, used to load gdt/idt tables before segments yet exist.
|
|
*/
|
|
struct region_descriptor {
|
|
unsigned rd_limit:16; /* segment extent */
|
|
unsigned rd_base:32 __packed; /* base address */
|
|
};
|
|
|
|
/*
|
|
* Segment Protection Exception code bits
|
|
*/
|
|
|
|
#define SEGEX_EXT 0x01 /* recursive or externally induced */
|
|
#define SEGEX_IDT 0x02 /* interrupt descriptor table */
|
|
#define SEGEX_TI 0x04 /* local descriptor table */
|
|
/* other bits are affected descriptor index */
|
|
#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
|
|
|
|
#ifdef _KERNEL
|
|
extern int _default_ldt;
|
|
#ifdef XEN
|
|
extern struct proc_ldt default_proc_ldt;
|
|
extern union descriptor *gdt;
|
|
extern union descriptor *ldt;
|
|
#else
|
|
extern union descriptor gdt[];
|
|
extern union descriptor ldt[NLDT];
|
|
#endif
|
|
extern struct soft_segment_descriptor gdt_segs[];
|
|
extern struct gate_descriptor *idt;
|
|
extern struct region_descriptor r_gdt, r_idt;
|
|
|
|
void lgdt(struct region_descriptor *rdp);
|
|
void sdtossd(struct segment_descriptor *sdp,
|
|
struct soft_segment_descriptor *ssdp);
|
|
void ssdtosd(struct soft_segment_descriptor *ssdp,
|
|
struct segment_descriptor *sdp);
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_MACHINE_SEGMENTS_H_ */
|