/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
/*
 * Copyright (c) 1992 NeXT Computer, Inc.
 *
 * Intel386 Family:	Descriptor tables.
 *
 * HISTORY
 *
 * 30 March 1992 ? at NeXT
 *	Created.
 */

#include <architecture/i386/desc.h>
#include <architecture/i386/tss.h>

/*
 * A totally generic descriptor
 * table entry.
 */

typedef union dt_entry {
    code_desc_t		code;
    data_desc_t		data;
    ldt_desc_t		ldt;
    tss_desc_t		task_state;
    call_gate_t		call_gate;
    trap_gate_t		trap_gate;
    intr_gate_t		intr_gate;
    task_gate_t		task_gate;
} dt_entry_t;

#define DESC_TBL_MAX	8192

/*
 * Global descriptor table.
 */

typedef union gdt_entry {
    code_desc_t		code;
    data_desc_t		data;
    ldt_desc_t		ldt;
    call_gate_t		call_gate;
    task_gate_t		task_gate;
    tss_desc_t		task_state;
} gdt_entry_t;

typedef gdt_entry_t	gdt_t;

/*
 * Interrupt descriptor table.
 */

typedef union idt_entry {
    trap_gate_t		trap_gate;
    intr_gate_t		intr_gate;
    task_gate_t		task_gate;
} idt_entry_t;

typedef idt_entry_t	idt_t;

/*
 * Local descriptor table.
 */

typedef union ldt_entry {
    code_desc_t		code;
    data_desc_t		data;
    call_gate_t		call_gate;
    task_gate_t		task_gate;
} ldt_entry_t;

typedef ldt_entry_t	ldt_t;
