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      1 /*	$NetBSD: tss.h,v 1.12 2018/07/07 21:35:16 kamil 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	0xffffu
     78 
     79 /*
     80  * If we have an I/O bitmap, there is only one valid offset.
     81  */
     82 #define	IOMAP_VALIDOFF	sizeof(struct i386tss)
     83 
     84 #endif /* #ifndef _I386_TSS_H_ */
     85