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

/*
 * Copyright (c) 2000 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,
				:2,
			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 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	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,
	53	:2,
	54	opsz :1,
	55	#define DESC_CODE_16B 0
	56	#define DESC_CODE_32B 1
	57	granular:1;
	58	#define DESC_GRAN_BYTE 0
	59	#define DESC_GRAN_PAGE 1
	60	unsigned char base24;
	61	} code_desc_t;
	62
	63	/*
	64	* Data segment descriptor.
	65	*/
	66
	67	typedef struct data_desc {
	68	unsigned short limit00;
	69	unsigned short base00;
	70	unsigned char base16;
	71	unsigned char type :5,
	72	#define DESC_DATA_RONLY 0x10
	73	#define DESC_DATA_WRITE 0x12
	74	dpl :2,
	75	present :1;
	76	unsigned char limit16 :4,
	77	:2,
	78	stksz :1,
	79	#define DESC_DATA_16B 0
	80	#define DESC_DATA_32B 1
	81	granular:1;
	82	unsigned char base24;
	83	} data_desc_t;
	84
	85	/*
	86	* LDT segment descriptor.
	87	*/
	88
	89	typedef struct ldt_desc {
	90	unsigned short limit00;
91	unsigned short base00;
92	unsigned char base16;
93	unsigned char type :5,
94	#define DESC_LDT 0x02
95	:2,
96	present :1;
97	unsigned char limit16 :4,
98	:3,
99	granular:1;
100	unsigned char base24;
101	} ldt_desc_t;
102
103	#include <architecture/i386/sel.h>
104
105	/*
106	* Call gate descriptor.
107	*/
108
109	typedef struct call_gate {
110	unsigned short offset00;
111	sel_t seg;
112	unsigned int argcnt :5,
113	:3,
114	type :5,
115	#define DESC_CALL_GATE 0x0c
116	dpl :2,
117	present :1,
118	offset16:16;
119	} call_gate_t;
120
121	/*
122	* Trap gate descriptor.
123	*/
124
125	typedef struct trap_gate {
126	unsigned short offset00;
127	sel_t seg;
128	unsigned int :8,
129	type :5,
130	#define DESC_TRAP_GATE 0x0f
131	dpl :2,
132	present :1,
133	offset16:16;
134	} trap_gate_t;
135
136
137	/*
138	* Interrupt gate descriptor.
139	*/
140
141	typedef struct intr_gate {
142	unsigned short offset00;
143	sel_t seg;
144	unsigned int :8,
145	type :5,
146	#define DESC_INTR_GATE 0x0e
147	dpl :2,
148	present :1,
149	offset16:16;
150	} intr_gate_t;