/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */

#ifndef	_I386_TSS_H_
#define	_I386_TSS_H_

#include <stdint.h>

/*
 *	i386 Task State Segment
 */
struct i386_tss {
	uint32_t	back_link;	/* segment number of previous task,
					   if nested */
	uint32_t	esp0;		/* initial stack pointer ... */
	uint32_t	ss0;		/* and segment for ring 0 */
	uint32_t	esp1;		/* initial stack pointer ... */
	uint32_t	ss1;		/* and segment for ring 1 */
	uint32_t	esp2;		/* initial stack pointer ... */
	uint32_t	ss2;		/* and segment for ring 2 */
	uint32_t	cr3;		/* CR3 - page table directory
						 physical address */
	uint32_t	eip;
	uint32_t	eflags;
	uint32_t	eax;
	uint32_t	ecx;
	uint32_t	edx;
	uint32_t	ebx;
	uint32_t	esp;		/* current stack pointer */
	uint32_t	ebp;
	uint32_t	esi;
	uint32_t	edi;
	uint32_t	es;
	uint32_t	cs;
	uint32_t	ss;		/* current stack segment */
	uint32_t	ds;
	uint32_t	fs;
	uint32_t	gs;
	uint32_t	ldt;		/* local descriptor table segment */
	uint16_t	trace_trap;	/* trap on switch to this task */
	uint16_t	io_bit_map_offset;
					/* offset to start of IO permission
					   bit map */
};

/*
 * Temporary stack used on kernel entry via the sysenter instruction.
 * Its top points on to the PCB save area. It must contain space for
 * a single interrupt stack frame in case of single-stepping over the sysenter.
 * Although this is defined as a 64-bit stack, the space is also used in
 * 32-bit legacy mode. For 64-bit the stack is 16-byte aligned.
 */
struct sysenter_stack {
	uint64_t	stack[16];	/* Space for a 64-bit frame and some */
	uint64_t	top;		/* Top and pointer to ISS in PCS */
};

struct x86_64_tss {
	uint32_t	reserved1;
	uint64_t	rsp0;		/* stack pointer for CPL0 */
	uint64_t	rsp1;		/* stack pointer for CPL1 */
	uint64_t	rsp2;		/* stack pointer for CPL2 */
	uint32_t	reserved2;
	uint32_t	reserved3;
	uint64_t	ist1;		/* interrupt stack table 1 */
	uint64_t	ist2;		/* interrupt stack table 2 */
	uint64_t	ist3;		/* interrupt stack table 3 */
	uint64_t	ist4;		/* interrupt stack table 4 */
	uint64_t	ist5;		/* interrupt stack table 5 */
	uint64_t	ist6;		/* interrupt stack table 6 */
	uint64_t	ist7;		/* interrupt stack table 7 */
	uint32_t	reserved4;
	uint32_t	reserved5;
	uint16_t	reserved6;
	uint16_t	io_bit_map_offset;
					/* offset to IO permission bit map */
};
#endif	/* _I386_TSS_H_ */
