[apple/xnu.git] / osfmk / i386 / seg.h

/*
 * 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 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_SEG_H_
#define	_I386_SEG_H_
#include <mach_kdb.h>

/*
 * i386 segmentation.
 */

#ifndef	__ASSEMBLER__
/*
 * Real segment descriptor.
 */
struct real_descriptor {
	unsigned int	limit_low:16,	/* limit 0..15 */
			base_low:16,	/* base  0..15 */
			base_med:8,	/* base  16..23 */
			access:8,	/* access byte */
			limit_high:4,	/* limit 16..19 */
			granularity:4,	/* granularity */
			base_high:8;	/* base 24..31 */
};

struct real_gate {
	unsigned int	offset_low:16,	/* offset 0..15 */
			selector:16,
			word_count:8,
			access:8,
			offset_high:16;	/* offset 16..31 */
};

/*
 * We build descriptors and gates in a 'fake' format to let the
 * fields be contiguous.  We shuffle them into the real format
 * at runtime.
 */
struct fake_descriptor {
	unsigned int	offset:32;		/* offset */
	unsigned int	lim_or_seg:20;		/* limit */
						/* or segment, for gate */
	unsigned int	size_or_wdct:4;		/* size/granularity */
						/* word count, for gate */
	unsigned int	access:8;		/* access */
};
#endif	/*__ASSEMBLER__*/

#define	SZ_32		0x4			/* 32-bit segment */
#define	SZ_G		0x8			/* 4K limit field */

#define	ACC_A		0x01			/* accessed */
#define	ACC_TYPE	0x1e			/* type field: */

#define	ACC_TYPE_SYSTEM	0x00			/* system descriptors: */

#define	ACC_LDT		0x02			    /* LDT */
#define	ACC_CALL_GATE_16 0x04			    /* 16-bit call gate */
#define	ACC_TASK_GATE	0x05			    /* task gate */
#define	ACC_TSS		0x09			    /* task segment */
#define	ACC_CALL_GATE	0x0c			    /* call gate */
#define	ACC_INTR_GATE	0x0e			    /* interrupt gate */
#define	ACC_TRAP_GATE	0x0f			    /* trap gate */

#define	ACC_TSS_BUSY	0x02			    /* task busy */

#define	ACC_TYPE_USER	0x10			/* user descriptors */

#define	ACC_DATA	0x10			    /* data */
#define	ACC_DATA_W	0x12			    /* data, writable */
#define	ACC_DATA_E	0x14			    /* data, expand-down */
#define	ACC_DATA_EW	0x16			    /* data, expand-down,
							     writable */
#define	ACC_CODE	0x18			    /* code */
#define	ACC_CODE_R	0x1a			    /* code, readable */
#define	ACC_CODE_C	0x1c			    /* code, conforming */
#define	ACC_CODE_CR	0x1e			    /* code, conforming,
						       readable */
#define	ACC_PL		0x60			/* access rights: */
#define	ACC_PL_K	0x00			/* kernel access only */
#define	ACC_PL_U	0x60			/* user access */
#define	ACC_P		0x80			/* segment present */

/*
 * Components of a selector
 */
#define	SEL_LDTS	0x04			/* local selector */
#define	SEL_PL		0x03			/* privilege level: */
#define	SEL_PL_K	0x00			    /* kernel selector */
#define	SEL_PL_U	0x03			    /* user selector */

/*
 * Convert selector to descriptor table index.
 */
#define	sel_idx(sel)	((sel)>>3)

/*
 * User descriptors for MACH - 32-bit flat address space
 */
#define	USER_SCALL	0x07		/* system call gate */
#define	USER_RPC	0x0f		/* mach rpc call gate */
#define	USER_CS		0x17		/* user code segment */
#define	USER_DS		0x1f		/* user data segment */

#define	LDTSZ		4

/*
 * Kernel descriptors for MACH - 32-bit flat address space.
 */
#define	KERNEL_CS	0x08		/* kernel code */
#define	KERNEL_DS	0x10		/* kernel data */
#define	KERNEL_LDT	0x18		/* master LDT */
#define	KERNEL_TSS	0x20		/* master TSS (uniprocessor) */
#ifdef	MACH_BSD
#define	BSD_SCALL_SEL	0x28		/* BSD System calls */
#define	MK25_SCALL_SEL	0x30		/* MK25 System Calls */
#define	MACHDEP_SCALL_SEL 0x38		/* Machdep SYstem calls */
#else
#define	USER_LDT	0x28		/* place for per-thread LDT */
#define	USER_TSS	0x30		/* place for per-thread TSS
					   that holds IO bitmap */
#define	FPE_CS		0x38		/* floating-point emulator code */
#endif
#define	USER_FPREGS	0x40		/* user-mode access to saved
					   floating-point registers */
#define	CPU_DATA	0x48		/* per-cpu data */

#ifdef	MACH_BSD
#define	USER_LDT	0x58
#define	USER_TSS	0x60
#define	FPE_CS		0x68
#endif

#if	MACH_KDB
#define	DEBUG_TSS	0x50		/* debug TSS (uniprocessor) */

#ifdef MACH_BSD
#define	GDTSZ		14
#else
#define	GDTSZ		11
#endif
#else

#ifdef	MACH_BSD
#define	GDTSZ		13
#else
#define	GDTSZ		10
#endif
#endif

/*
 * Interrupt table is always 256 entries long.
 */
#define	IDTSZ		256

#endif	/* _I386_SEG_H_ */
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* @OSF_COPYRIGHT@
	24	*/
	25	/*
	26	* Mach Operating System
	27	* Copyright (c) 1991,1990 Carnegie Mellon University
	28	* All Rights Reserved.
	29	*
	30	* Permission to use, copy, modify and distribute this software and its
	31	* documentation is hereby granted, provided that both the copyright
	32	* notice and this permission notice appear in all copies of the
	33	* software, derivative works or modified versions, and any portions
	34	* thereof, and that both notices appear in supporting documentation.
	35	*
	36	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	37	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	38	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	39	*
	40	* Carnegie Mellon requests users of this software to return to
	41	*
	42	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	43	* School of Computer Science
	44	* Carnegie Mellon University
	45	* Pittsburgh PA 15213-3890
	46	*
	47	* any improvements or extensions that they make and grant Carnegie Mellon
	48	* the rights to redistribute these changes.
	49	*/
	50	/*
	51	*/
	52
	53	#ifndef _I386_SEG_H_
	54	#define _I386_SEG_H_
	55	#include <mach_kdb.h>
	56
	57	/*
	58	* i386 segmentation.
	59	*/
	60
	61	#ifndef __ASSEMBLER__
	62	/*
	63	* Real segment descriptor.
	64	*/
	65	struct real_descriptor {
	66	unsigned int limit_low:16, /* limit 0..15 */
	67	base_low:16, /* base 0..15 */
	68	base_med:8, /* base 16..23 */
	69	access:8, /* access byte */
	70	limit_high:4, /* limit 16..19 */
	71	granularity:4, /* granularity */
	72	base_high:8; /* base 24..31 */
	73	};
	74
	75	struct real_gate {
	76	unsigned int offset_low:16, /* offset 0..15 */
	77	selector:16,
	78	word_count:8,
	79	access:8,
	80	offset_high:16; /* offset 16..31 */
	81	};
	82
83	/*
84	* We build descriptors and gates in a 'fake' format to let the
85	* fields be contiguous. We shuffle them into the real format
86	* at runtime.
87	*/
88	struct fake_descriptor {
89	unsigned int offset:32; /* offset */
90	unsigned int lim_or_seg:20; /* limit */
91	/* or segment, for gate */
92	unsigned int size_or_wdct:4; /* size/granularity */
93	/* word count, for gate */
94	unsigned int access:8; /* access */
95	};
96	#endif /__ASSEMBLER__/
97
98	#define SZ_32 0x4 /* 32-bit segment */
99	#define SZ_G 0x8 /* 4K limit field */
100
101	#define ACC_A 0x01 /* accessed */
102	#define ACC_TYPE 0x1e /* type field: */
103
104	#define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
105
106	#define ACC_LDT 0x02 /* LDT */
107	#define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
108	#define ACC_TASK_GATE 0x05 /* task gate */
109	#define ACC_TSS 0x09 /* task segment */
110	#define ACC_CALL_GATE 0x0c /* call gate */
111	#define ACC_INTR_GATE 0x0e /* interrupt gate */
112	#define ACC_TRAP_GATE 0x0f /* trap gate */
113
114	#define ACC_TSS_BUSY 0x02 /* task busy */
115
116	#define ACC_TYPE_USER 0x10 /* user descriptors */
117
118	#define ACC_DATA 0x10 /* data */
119	#define ACC_DATA_W 0x12 /* data, writable */
120	#define ACC_DATA_E 0x14 /* data, expand-down */
121	#define ACC_DATA_EW 0x16 /* data, expand-down,
122	writable */
123	#define ACC_CODE 0x18 /* code */
124	#define ACC_CODE_R 0x1a /* code, readable */
125	#define ACC_CODE_C 0x1c /* code, conforming */
126	#define ACC_CODE_CR 0x1e /* code, conforming,
127	readable */
128	#define ACC_PL 0x60 /* access rights: */
129	#define ACC_PL_K 0x00 /* kernel access only */
130	#define ACC_PL_U 0x60 /* user access */
131	#define ACC_P 0x80 /* segment present */
132
133	/*
134	* Components of a selector
135	*/
136	#define SEL_LDTS 0x04 /* local selector */
137	#define SEL_PL 0x03 /* privilege level: */
138	#define SEL_PL_K 0x00 /* kernel selector */
139	#define SEL_PL_U 0x03 /* user selector */
140
141	/*
142	* Convert selector to descriptor table index.
143	*/
144	#define sel_idx(sel) ((sel)>>3)
145
146	/*
147	* User descriptors for MACH - 32-bit flat address space
148	*/
149	#define USER_SCALL 0x07 /* system call gate */
150	#define USER_RPC 0x0f /* mach rpc call gate */
151	#define USER_CS 0x17 /* user code segment */
152	#define USER_DS 0x1f /* user data segment */
153
154	#define LDTSZ 4
155
156	/*
157	* Kernel descriptors for MACH - 32-bit flat address space.
158	*/
159	#define KERNEL_CS 0x08 /* kernel code */
160	#define KERNEL_DS 0x10 /* kernel data */
161	#define KERNEL_LDT 0x18 /* master LDT */
162	#define KERNEL_TSS 0x20 /* master TSS (uniprocessor) */
163	#ifdef MACH_BSD
164	#define BSD_SCALL_SEL 0x28 /* BSD System calls */
165	#define MK25_SCALL_SEL 0x30 /* MK25 System Calls */
166	#define MACHDEP_SCALL_SEL 0x38 /* Machdep SYstem calls */
167	#else
168	#define USER_LDT 0x28 /* place for per-thread LDT */
169	#define USER_TSS 0x30 /* place for per-thread TSS
170	that holds IO bitmap */
171	#define FPE_CS 0x38 /* floating-point emulator code */
172	#endif
173	#define USER_FPREGS 0x40 /* user-mode access to saved
174	floating-point registers */
175	#define CPU_DATA 0x48 /* per-cpu data */
176
177	#ifdef MACH_BSD
178	#define USER_LDT 0x58
179	#define USER_TSS 0x60
180	#define FPE_CS 0x68
181	#endif
182
183	#if MACH_KDB
184	#define DEBUG_TSS 0x50 /* debug TSS (uniprocessor) */
185
186	#ifdef MACH_BSD
187	#define GDTSZ 14
188	#else
189	#define GDTSZ 11
190	#endif
191	#else
192
193	#ifdef MACH_BSD
194	#define GDTSZ 13
195	#else
196	#define GDTSZ 10
197	#endif
198	#endif
199
200	/*
201	* Interrupt table is always 256 entries long.
202	*/
203	#define IDTSZ 256
204
205	#endif /* _I386_SEG_H_ */