sys/cpu/i386/include/tss.h

   1 /*-
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * William Jolitz.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      from: @(#)tss.h 5.4 (Berkeley) 1/18/91
  37  * $FreeBSD: src/sys/i386/include/tss.h,v 1.11 1999/12/29 04:33:09 peter Exp $
  38  * $DragonFly: src/sys/cpu/i386/include/tss.h,v 1.5 2006/11/07 06:43:22 dillon Exp $
  39  */
  40
  41 #ifndef _CPU_TSS_H_
  42 #define _CPU_TSS_H_
  43
  44 /*
  45  * Intel 386 Context Data Type
  46  */
  47
  48 struct i386tss {
  49         int     tss_link;       /* actually 16 bits: top 16 bits must be zero */
  50         int     tss_esp0;       /* kernel stack pointer privilege level 0 */
  51 #define tss_ksp tss_esp0
  52         int     tss_ss0;        /* actually 16 bits: top 16 bits must be zero */
  53         int     tss_esp1;       /* kernel stack pointer privilege level 1 */
  54         int     tss_ss1;        /* actually 16 bits: top 16 bits must be zero */
  55         int     tss_esp2;       /* kernel stack pointer privilege level 2 */
  56         int     tss_ss2;        /* actually 16 bits: top 16 bits must be zero */
  57         int     tss_cr3;        /* page table directory */
  58 #define tss_ptd tss_cr3
  59         int     tss_eip;        /* program counter */
  60 #define tss_pc  tss_eip
  61         int     tss_eflags;     /* program status longword */
  62 #define tss_psl tss_eflags
  63         int     tss_eax;
  64         int     tss_ecx;
  65         int     tss_edx;
  66         int     tss_ebx;
  67         int     tss_esp;        /* user stack pointer */
  68 #define tss_usp tss_esp
  69         int     tss_ebp;        /* user frame pointer */
  70 #define tss_fp  tss_ebp
  71         int     tss_esi;
  72         int     tss_edi;
  73         int     tss_es;         /* actually 16 bits: top 16 bits must be zero */
  74         int     tss_cs;         /* actually 16 bits: top 16 bits must be zero */
  75         int     tss_ss;         /* actually 16 bits: top 16 bits must be zero */
  76         int     tss_ds;         /* actually 16 bits: top 16 bits must be zero */
  77         int     tss_fs;         /* actually 16 bits: top 16 bits must be zero */
  78         int     tss_gs;         /* actually 16 bits: top 16 bits must be zero */
  79         int     tss_ldt;        /* actually 16 bits: top 16 bits must be zero */
  80         int     tss_ioopt;      /* options & io offset bitmap: currently zero */
  81                                 /* XXX unimplemented .. i/o permission bitmap */
  82 };
  83
  84 #endif /* _CPU_TSS_H_ */
  85