sys/arch/i386/include/tss.h

   1 /*      $NetBSD: tss.h,v 1.10 2008/01/05 21:45:00 yamt Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)tss.h       5.4 (Berkeley) 1/18/91
  35  */
  36
  37 #ifndef _I386_TSS_H_
  38 #define _I386_TSS_H_
  39
  40 /*
  41  * Intel 386 Context Data Type
  42  */
  43
  44 struct i386tss {
  45         int     __tss_link;
  46         int     tss_esp0;       /* kernel stack pointer at privilege level 0 */
  47         int     tss_ss0;        /* kernel stack segment at privilege level 0 */
  48         int     __tss_esp1;
  49         int     __tss_ss1;
  50         int     __tss_esp2;
  51         int     __tss_ss2;
  52         int     tss_cr3;        /* page directory paddr */
  53         int     __tss_eip;
  54         int     __tss_eflags;
  55         int     __tss_eax;
  56         int     __tss_ecx;
  57         int     __tss_edx;
  58         int     __tss_ebx;
  59         int     tss_esp;        /* saved stack pointer */
  60         int     tss_ebp;        /* saved frame pointer */
  61         int     __tss_esi;
  62         int     __tss_edi;
  63         int     __tss_es;
  64         int     __tss_cs;
  65         int     __tss_ss;
  66         int     __tss_ds;
  67         int     tss_fs;         /* saved segment register */
  68         int     tss_gs;         /* saved segment register */
  69         int     tss_ldt;        /* LDT selector */
  70         int     tss_iobase;     /* options and I/O permission map offset */
  71 };
  72
  73 /*
  74  * I/O bitmap offset beyond TSS's segment limit means no bitmaps.
  75  * (i.e. any I/O attempt generates an exception.)
  76  */
  77 #define IOMAP_INVALOFF  0xffff
  78
  79 #endif /* #ifndef _I386_TSS_H_ */