[apple/xnu.git] / EXTERNAL_HEADERS / architecture / i386 / desc.h

/*
 * Copyright (c) 2000-2019 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_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_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1992 NeXT Computer, Inc.
 *
 * Intel386 Family:	Segment descriptors.
 *
 * HISTORY
 *
 * 29 March 1992 ? at NeXT
 *	Created.
 */
 
/*
 * Code segment descriptor.
 */

typedef struct code_desc {
    unsigned short	limit00;
    unsigned short	base00;
    unsigned char	base16;
    unsigned char	type	:5,
#define DESC_CODE_EXEC	0x18
#define DESC_CODE_READ	0x1a
			dpl	:2,
			present	:1;
    unsigned char	limit16	:4,
				:1,
                        Lflag   :1,
			opsz	:1,
#define DESC_CODE_16B	0
#define DESC_CODE_32B	1
			granular:1;
#define DESC_GRAN_BYTE	0
#define DESC_GRAN_PAGE	1
    unsigned char	base24;
} code_desc_t;
 
/*
 * Data segment descriptor.
 */

typedef struct data_desc {
    unsigned short	limit00;
    unsigned short	base00;
    unsigned char	base16;
    unsigned char	type	:5,
#define DESC_DATA_RONLY	0x10
#define DESC_DATA_WRITE	0x12
			dpl	:2,
			present	:1;
    unsigned char	limit16	:4,
				:2,
			stksz	:1,
#define DESC_DATA_16B	0
#define DESC_DATA_32B	1
			granular:1;
    unsigned char	base24;
} data_desc_t;

/*
 * LDT segment descriptor.
 */

typedef struct ldt_desc {
    unsigned short	limit00;
    unsigned short	base00;
    unsigned char	base16;
    unsigned char	type	:5,
#define DESC_LDT	0x02
				:2,
			present	:1;
    unsigned char	limit16	:4,
				:3,
			granular:1;
    unsigned char	base24;
} ldt_desc_t;

#include <architecture/i386/sel.h>

/*
 * Call gate descriptor.
 */
 
typedef struct call_gate {
    unsigned short	offset00;
    sel_t		seg;
    unsigned int	argcnt	:5,
    				:3,
			type	:5,
#define DESC_CALL_GATE	0x0c
			dpl	:2,
			present	:1,
			offset16:16;
} call_gate_t;

/*
 * Trap gate descriptor.
 */
 
typedef struct trap_gate {
    unsigned short	offset00;
    sel_t		seg;
    unsigned int		:8,
    			type	:5,
#define DESC_TRAP_GATE	0x0f
			dpl	:2,
			present	:1,
			offset16:16;
} trap_gate_t;


/*
 * Interrupt gate descriptor.
 */
 
typedef struct intr_gate {
    unsigned short	offset00;
    sel_t		seg;
    unsigned int		:8,
    			type	:5,
#define DESC_INTR_GATE	0x0e
			dpl	:2,
			present	:1,
			offset16:16;
} intr_gate_t;
Commit	Line	Data
1c79356b	1	/*
0a7de745	2	* Copyright (c) 2000-2019 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* Copyright (c) 1992 NeXT Computer, Inc.
	30	*
	31	* Intel386 Family: Segment descriptors.
	32	*
	33	* HISTORY
	34	*
	35	* 29 March 1992 ? at NeXT
	36	* Created.
	37	*/
	38
	39	/*
	40	* Code segment descriptor.
	41	*/
	42
	43	typedef struct code_desc {
	44	unsigned short limit00;
	45	unsigned short base00;
	46	unsigned char base16;
	47	unsigned char type :5,
	48	#define DESC_CODE_EXEC 0x18
	49	#define DESC_CODE_READ 0x1a
	50	dpl :2,
	51	present :1;
	52	unsigned char limit16 :4,
0a7de745 A	53	:1,
0a7de745 A	54	Lflag :1,
1c79356b A	55	opsz :1,
	56	#define DESC_CODE_16B 0
	57	#define DESC_CODE_32B 1
	58	granular:1;
	59	#define DESC_GRAN_BYTE 0
	60	#define DESC_GRAN_PAGE 1
	61	unsigned char base24;
	62	} code_desc_t;
	63
	64	/*
	65	* Data segment descriptor.
	66	*/
	67
	68	typedef struct data_desc {
	69	unsigned short limit00;
	70	unsigned short base00;
	71	unsigned char base16;
	72	unsigned char type :5,
	73	#define DESC_DATA_RONLY 0x10
	74	#define DESC_DATA_WRITE 0x12
	75	dpl :2,
	76	present :1;
	77	unsigned char limit16 :4,
	78	:2,
	79	stksz :1,
	80	#define DESC_DATA_16B 0
	81	#define DESC_DATA_32B 1
	82	granular:1;
	83	unsigned char base24;
	84	} data_desc_t;
	85
	86	/*
	87	* LDT segment descriptor.
	88	*/
	89
	90	typedef struct ldt_desc {
	91	unsigned short limit00;
	92	unsigned short base00;
	93	unsigned char base16;
	94	unsigned char type :5,
	95	#define DESC_LDT 0x02
	96	:2,
	97	present :1;
	98	unsigned char limit16 :4,
	99	:3,
	100	granular:1;
	101	unsigned char base24;
	102	} ldt_desc_t;
	103
	104	#include <architecture/i386/sel.h>
	105
	106	/*
	107	* Call gate descriptor.
	108	*/
	109
	110	typedef struct call_gate {
	111	unsigned short offset00;
	112	sel_t seg;
	113	unsigned int argcnt :5,
	114	:3,
	115	type :5,
	116	#define DESC_CALL_GATE 0x0c
	117	dpl :2,
	118	present :1,
119	offset16:16;
120	} call_gate_t;
121
122	/*
123	* Trap gate descriptor.
124	*/
125
126	typedef struct trap_gate {
127	unsigned short offset00;
128	sel_t seg;
129	unsigned int :8,
130	type :5,
131	#define DESC_TRAP_GATE 0x0f
132	dpl :2,
133	present :1,
134	offset16:16;
135	} trap_gate_t;
136
137
138	/*
139	* Interrupt gate descriptor.
140	*/
141
142	typedef struct intr_gate {
143	unsigned short offset00;
144	sel_t seg;
145	unsigned int :8,
146	type :5,
147	#define DESC_INTR_GATE 0x0e
148	dpl :2,
149	present :1,
150	offset16:16;
151	} intr_gate_t;