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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1992 NeXT Computer, Inc.
	27	*
	28	* Intel386 Family: Segment descriptors.
	29	*
	30	* HISTORY
	31	*
	32	* 29 March 1992 ? at NeXT
	33	* Created.
	34	*/
	35
	36	/*
	37	* Code segment descriptor.
	38	*/
	39
	40	typedef struct code_desc {
	41	unsigned short limit00;
	42	unsigned short base00;
	43	unsigned char base16;
	44	unsigned char type :5,
	45	#define DESC_CODE_EXEC 0x18
	46	#define DESC_CODE_READ 0x1a
	47	dpl :2,
	48	present :1;
	49	unsigned char limit16 :4,
	50	:2,
	51	opsz :1,
	52	#define DESC_CODE_16B 0
	53	#define DESC_CODE_32B 1
	54	granular:1;
	55	#define DESC_GRAN_BYTE 0
	56	#define DESC_GRAN_PAGE 1
	57	unsigned char base24;
	58	} code_desc_t;
	59
	60	/*
	61	* Data segment descriptor.
	62	*/
	63
	64	typedef struct data_desc {
	65	unsigned short limit00;
	66	unsigned short base00;
	67	unsigned char base16;
	68	unsigned char type :5,
	69	#define DESC_DATA_RONLY 0x10
	70	#define DESC_DATA_WRITE 0x12
	71	dpl :2,
	72	present :1;
	73	unsigned char limit16 :4,
	74	:2,
	75	stksz :1,
	76	#define DESC_DATA_16B 0
	77	#define DESC_DATA_32B 1
	78	granular:1;
	79	unsigned char base24;
	80	} data_desc_t;
	81
	82	/*
	83	* LDT segment descriptor.
	84	*/
	85
86	typedef struct ldt_desc {
87	unsigned short limit00;
88	unsigned short base00;
89	unsigned char base16;
90	unsigned char type :5,
91	#define DESC_LDT 0x02
92	:2,
93	present :1;
94	unsigned char limit16 :4,
95	:3,
96	granular:1;
97	unsigned char base24;
98	} ldt_desc_t;
99
100	#include <architecture/i386/sel.h>
101
102	/*
103	* Call gate descriptor.
104	*/
105
106	typedef struct call_gate {
107	unsigned short offset00;
108	sel_t seg;
109	unsigned int argcnt :5,
110	:3,
111	type :5,
112	#define DESC_CALL_GATE 0x0c
113	dpl :2,
114	present :1,
115	offset16:16;
116	} call_gate_t;
117
118	/*
119	* Trap gate descriptor.
120	*/
121
122	typedef struct trap_gate {
123	unsigned short offset00;
124	sel_t seg;
125	unsigned int :8,
126	type :5,
127	#define DESC_TRAP_GATE 0x0f
128	dpl :2,
129	present :1,
130	offset16:16;
131	} trap_gate_t;
132
133
134	/*
135	* Interrupt gate descriptor.
136	*/
137
138	typedef struct intr_gate {
139	unsigned short offset00;
140	sel_t seg;
141	unsigned int :8,
142	type :5,
143	#define DESC_INTR_GATE 0x0e
144	dpl :2,
145	present :1,
146	offset16:16;
147	} intr_gate_t;