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

/*
 * Copyright (c) 2000-2006 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@
 */
/*
 * @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>
#ifndef ASSEMBLER
#include <stdint.h>
#include <mach/vm_types.h>
#include <architecture/i386/sel.h>

/*
 * i386 segmentation.
 */

static inline uint16_t
sel_to_selector(sel_t	sel)
{
    union {
	sel_t		sel;
	uint16_t	selector;
    } tconv;
    
    tconv.sel = sel;
    
    return (tconv.selector);
}

static inline sel_t
selector_to_sel(uint16_t selector)
{
    union {
	uint16_t	selector;
	sel_t		sel;
    } tconv;
    
    tconv.selector = selector;
    
    return (tconv.sel);
}

#define LDTSZ		8192		/* size of the kernel ldt in entries */
#define	LDTSZ_MIN	SEL_TO_INDEX(USER_SETTABLE)
					/* kernel ldt entries */

#if	MACH_KDB
#define	GDTSZ		19
#else
#define	GDTSZ		18
#endif

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

#include <sys/cdefs.h>

/*
 * Real segment descriptor.
 */
struct real_descriptor {
	uint32_t	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_descriptor64 {
	uint32_t	limit_low16:16,	/* limit 0..15 */
			base_low16:16,	/* base  0..15 */
			base_med8:8,	/* base  16..23 */
			access8:8,	/* access byte */
			limit_high4:4,	/* limit 16..19 */
			granularity4:4,	/* granularity */
			base_high8:8,	/* base 24..31 */
			base_top32:32,	/* base 32..63 */
			reserved32:32;	/* reserved/zero */
};
struct real_gate {
	uint32_t	offset_low:16,	/* offset 0..15 */
			selector:16,
			word_count:8,
			access:8,
			offset_high:16;	/* offset 16..31 */
};
struct real_gate64 {
	uint32_t	offset_low16:16,	/* offset 0..15 */
			selector16:16,
			IST:3,
			zeroes5:5,
			access8:8,
			offset_high16:16,	/* offset 16..31 */
			offset_top32:32,	/* offset 32..63 */
			reserved32:32;		/* reserved/zero */
};

/*
 * 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 {
	uint32_t	offset:32;		/* offset */
	uint32_t	lim_or_seg:20;		/* limit */
						/* or segment, for gate */
	uint32_t	size_or_wdct:4;		/* size/granularity */
						/* word count, for gate */
	uint32_t	access:8;		/* access */
};
struct fake_descriptor64 {
	uint32_t	offset[2];		/* offset [0..31,32..63] */
	uint32_t	lim_or_seg:20;		/* limit */
						/* or segment, for gate */
	uint32_t	size_or_IST:4;		/* size/granularity */
						/* IST for gates */
	uint32_t	access:8;		/* access */
	uint32_t	reserved:32;		/* reserved/zero */
};
#define	FAKE_UBER64(addr32)	{ (uint32_t) (addr32), KERNEL_UBER_BASE_HI32 }
#define	FAKE_COMPAT(addr32)	{ (uint32_t) (addr32), 0x0 }
#define	UBER64(addr32)		((addr64_t) (uintptr_t)addr32 + KERNEL_UBER_BASE)

/*
 * Boot-time data for master (or only) CPU
 */
extern struct fake_descriptor	master_idt[IDTSZ];
extern struct fake_descriptor	master_gdt[GDTSZ];
extern struct fake_descriptor	master_ldt[LDTSZ];
extern struct i386_tss		master_ktss;
extern struct sysenter_stack	master_sstk;

extern struct fake_descriptor64	master_idt64[IDTSZ];
extern struct fake_descriptor64	kernel_ldt_desc64;
extern struct fake_descriptor64	kernel_tss_desc64;
extern struct x86_64_tss	master_ktss64;

__BEGIN_DECLS

extern char			df_task_stack[];
extern char			df_task_stack_end[];
extern struct i386_tss		master_dftss;
extern void			df_task_start(void);

extern char			mc_task_stack[];
extern char			mc_task_stack_end[];
extern struct i386_tss		master_mctss;
extern void			mc_task_start(void);

#if	MACH_KDB
extern char			db_stack_store[];
extern char			db_task_stack_store[];
extern struct i386_tss		master_dbtss;
extern void			db_task_start(void);
#endif	/* MACH_KDB */

__END_DECLS

#endif	/*__ASSEMBLER__*/

#define	SZ_64		0x2			/* 64-bit segment */
#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)	(selector_to_sel(sel).index)
#define SEL_TO_INDEX(s)	((s)>>3)

#define NULL_SEG	0

/*
 * User descriptors for MACH - 32-bit flat address space
 */
#define	SYSENTER_CS	0x07		/* sysenter kernel code segment */
#define	SYSENTER_DS	0x0f		/* sysenter kernel data segment */
#define	USER_CS		0x17		/* user code segment
					   Must be SYSENTER_CS+16 for sysexit */
/* Special case: sysenter with EFL_TF (trace bit) set - use iret not sysexit */
#define SYSENTER_TF_CS	(USER_CS|0x10000)
#define	USER_DS		0x1f		/* user data segment 
					   Must be SYSENTER_CS+24 for sysexit */
#define	USER64_CS	0x27		/* 64-bit user code segment 
					   Must be USER_CS+16 for sysret */
#define	USER64_DS	USER_DS		/* 64-bit user data segment == 32-bit */
#define	SYSCALL_CS	0x2f		/* 64-bit syscall pseudo-segment */
#define	USER_CTHREAD	0x37		/* user cthread area */
#define	USER_SETTABLE	0x3f		/* start of user settable ldt entries */
#define	USLDTSZ		10		/* number of user settable entries */

/*
 * 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_LDT_2	0x20		/* master LDT expanded for 64-bit */
#define	KERNEL_TSS	0x28		/* master TSS */
#define	KERNEL_TSS_2	0x30		/* master TSS expanded for 64-bit */

#define	MC_TSS		0x38		/* machine-check handler TSS */

#define	CPU_DATA_GS	0x48		/* per-cpu data */

#define	DF_TSS		0x50		/* double-fault handler TSS */

#define	USER_LDT	0x58
#define	USER_TSS	0x60
#define	FPE_CS		0x68

#define USER_WINDOW_SEL	0x70		/* window for copyin/copyout */
#define PHYS_WINDOW_SEL	0x78		/* window for copyin/copyout */

#define	KERNEL64_CS	0x80		/* kernel 64-bit code */
#define	KERNEL64_SS	0x88		/* kernel 64-bit (syscall) stack */

#if	MACH_KDB
#define	DEBUG_TSS	0x90		/* debug TSS (uniprocessor) */
#endif

#ifndef __ASSEMBLER__
struct __gdt_desc_struct {
  unsigned short size;
  unsigned long address __attribute__((packed));
  unsigned short pad;
} __attribute__ ((packed));

struct __idt_desc_struct {
  unsigned short size;
  unsigned long address __attribute__((packed));
  unsigned short pad;
} __attribute__ ((packed));
#endif /* __ASSEMBLER__ */

#endif	/* _I386_SEG_H_ */
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2006 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	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
1c79356b A	56	#ifndef _I386_SEG_H_
1c79356b A	57	#define _I386_SEG_H_
91447636	58
1c79356b	59	#include <mach_kdb.h>
2d21ac55	60	#ifndef ASSEMBLER
91447636	61	#include <stdint.h>
0c530ab8	62	#include <mach/vm_types.h>
91447636	63	#include <architecture/i386/sel.h>
1c79356b A	64
	65	/*
	66	* i386 segmentation.
	67	*/
	68
91447636 A	69	static inline uint16_t
	70	sel_to_selector(sel_t sel)
	71	{
	72	union {
	73	sel_t sel;
	74	uint16_t selector;
	75	} tconv;
	76
	77	tconv.sel = sel;
	78
	79	return (tconv.selector);
	80	}
	81
	82	static inline sel_t
	83	selector_to_sel(uint16_t selector)
	84	{
	85	union {
	86	uint16_t selector;
	87	sel_t sel;
	88	} tconv;
	89
	90	tconv.selector = selector;
	91
	92	return (tconv.sel);
	93	}
	94
0c530ab8	95	#define LDTSZ 8192 /* size of the kernel ldt in entries */
2d21ac55 A	96	#define LDTSZ_MIN SEL_TO_INDEX(USER_SETTABLE)
2d21ac55 A	97	/* kernel ldt entries */
91447636 A	98
91447636 A	99	#if MACH_KDB
0c530ab8	100	#define GDTSZ 19
6601e61a	101	#else
0c530ab8	102	#define GDTSZ 18
6601e61a	103	#endif
91447636 A	104
	105	/*
	106	* Interrupt table is always 256 entries long.
	107	*/
	108	#define IDTSZ 256
	109
91447636 A	110	#include <sys/cdefs.h>
91447636 A	111
1c79356b A	112	/*
	113	* Real segment descriptor.
	114	*/
	115	struct real_descriptor {
0c530ab8	116	uint32_t limit_low:16, /* limit 0..15 */
1c79356b A	117	base_low:16, /* base 0..15 */
	118	base_med:8, /* base 16..23 */
	119	access:8, /* access byte */
	120	limit_high:4, /* limit 16..19 */
	121	granularity:4, /* granularity */
	122	base_high:8; /* base 24..31 */
	123	};
0c530ab8 A	124	struct real_descriptor64 {
	125	uint32_t limit_low16:16, /* limit 0..15 */
	126	base_low16:16, /* base 0..15 */
	127	base_med8:8, /* base 16..23 */
	128	access8:8, /* access byte */
	129	limit_high4:4, /* limit 16..19 */
	130	granularity4:4, /* granularity */
	131	base_high8:8, /* base 24..31 */
	132	base_top32:32, /* base 32..63 */
	133	reserved32:32; /* reserved/zero */
	134	};
1c79356b	135	struct real_gate {
0c530ab8	136	uint32_t offset_low:16, /* offset 0..15 */
1c79356b A	137	selector:16,
	138	word_count:8,
	139	access:8,
	140	offset_high:16; /* offset 16..31 */
	141	};
0c530ab8 A	142	struct real_gate64 {
	143	uint32_t offset_low16:16, /* offset 0..15 */
	144	selector16:16,
	145	IST:3,
	146	zeroes5:5,
	147	access8:8,
	148	offset_high16:16, /* offset 16..31 */
	149	offset_top32:32, /* offset 32..63 */
	150	reserved32:32; /* reserved/zero */
	151	};
1c79356b A	152
	153	/*
	154	* We build descriptors and gates in a 'fake' format to let the
	155	* fields be contiguous. We shuffle them into the real format
	156	* at runtime.
	157	*/
	158	struct fake_descriptor {
0c530ab8 A	159	uint32_t offset:32; /* offset */
0c530ab8 A	160	uint32_t lim_or_seg:20; /* limit */
1c79356b	161	/* or segment, for gate */
0c530ab8	162	uint32_t size_or_wdct:4; /* size/granularity */
1c79356b	163	/* word count, for gate */
0c530ab8	164	uint32_t access:8; /* access */
4452a7af	165	};
0c530ab8 A	166	struct fake_descriptor64 {
	167	uint32_t offset[2]; /* offset [0..31,32..63] */
	168	uint32_t lim_or_seg:20; /* limit */
	169	/* or segment, for gate */
	170	uint32_t size_or_IST:4; /* size/granularity */
	171	/* IST for gates */
	172	uint32_t access:8; /* access */
	173	uint32_t reserved:32; /* reserved/zero */
	174	};
	175	#define FAKE_UBER64(addr32) { (uint32_t) (addr32), KERNEL_UBER_BASE_HI32 }
	176	#define FAKE_COMPAT(addr32) { (uint32_t) (addr32), 0x0 }
cf7d32b8	177	#define UBER64(addr32) ((addr64_t) (uintptr_t)addr32 + KERNEL_UBER_BASE)
91447636 A	178
	179	/*
	180	* Boot-time data for master (or only) CPU
	181	*/
0c530ab8 A	182	extern struct fake_descriptor master_idt[IDTSZ];
	183	extern struct fake_descriptor master_gdt[GDTSZ];
	184	extern struct fake_descriptor master_ldt[LDTSZ];
	185	extern struct i386_tss master_ktss;
	186	extern struct sysenter_stack master_sstk;
	187
	188	extern struct fake_descriptor64 master_idt64[IDTSZ];
	189	extern struct fake_descriptor64 kernel_ldt_desc64;
	190	extern struct fake_descriptor64 kernel_tss_desc64;
	191	extern struct x86_64_tss master_ktss64;
91447636 A	192
	193	__BEGIN_DECLS
	194
0c530ab8 A	195	extern char df_task_stack[];
	196	extern char df_task_stack_end[];
	197	extern struct i386_tss master_dftss;
	198	extern void df_task_start(void);
	199
	200	extern char mc_task_stack[];
	201	extern char mc_task_stack_end[];
	202	extern struct i386_tss master_mctss;
	203	extern void mc_task_start(void);
	204
91447636 A	205	#if MACH_KDB
	206	extern char db_stack_store[];
	207	extern char db_task_stack_store[];
0c530ab8	208	extern struct i386_tss master_dbtss;
91447636 A	209	extern void db_task_start(void);
	210	#endif /* MACH_KDB */
	211
	212	__END_DECLS
	213
1c79356b A	214	#endif /__ASSEMBLER__/
1c79356b A	215
0c530ab8	216	#define SZ_64 0x2 /* 64-bit segment */
1c79356b A	217	#define SZ_32 0x4 /* 32-bit segment */
	218	#define SZ_G 0x8 /* 4K limit field */
	219
	220	#define ACC_A 0x01 /* accessed */
	221	#define ACC_TYPE 0x1e /* type field: */
	222
	223	#define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
	224
	225	#define ACC_LDT 0x02 /* LDT */
	226	#define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
	227	#define ACC_TASK_GATE 0x05 /* task gate */
	228	#define ACC_TSS 0x09 /* task segment */
	229	#define ACC_CALL_GATE 0x0c /* call gate */
	230	#define ACC_INTR_GATE 0x0e /* interrupt gate */
	231	#define ACC_TRAP_GATE 0x0f /* trap gate */
	232
	233	#define ACC_TSS_BUSY 0x02 /* task busy */
	234
	235	#define ACC_TYPE_USER 0x10 /* user descriptors */
	236
	237	#define ACC_DATA 0x10 /* data */
	238	#define ACC_DATA_W 0x12 /* data, writable */
	239	#define ACC_DATA_E 0x14 /* data, expand-down */
	240	#define ACC_DATA_EW 0x16 /* data, expand-down,
	241	writable */
	242	#define ACC_CODE 0x18 /* code */
	243	#define ACC_CODE_R 0x1a /* code, readable */
	244	#define ACC_CODE_C 0x1c /* code, conforming */
	245	#define ACC_CODE_CR 0x1e /* code, conforming,
	246	readable */
	247	#define ACC_PL 0x60 /* access rights: */
	248	#define ACC_PL_K 0x00 /* kernel access only */
	249	#define ACC_PL_U 0x60 /* user access */
	250	#define ACC_P 0x80 /* segment present */
	251
	252	/*
	253	* Components of a selector
	254	*/
	255	#define SEL_LDTS 0x04 /* local selector */
	256	#define SEL_PL 0x03 /* privilege level: */
	257	#define SEL_PL_K 0x00 /* kernel selector */
	258	#define SEL_PL_U 0x03 /* user selector */
	259
	260	/*
	261	* Convert selector to descriptor table index.
	262	*/
91447636	263	#define sel_idx(sel) (selector_to_sel(sel).index)
0c530ab8	264	#define SEL_TO_INDEX(s) ((s)>>3)
91447636 A	265
91447636 A	266	#define NULL_SEG 0
1c79356b A	267
	268	/*
	269	* User descriptors for MACH - 32-bit flat address space
	270	*/
0c530ab8 A	271	#define SYSENTER_CS 0x07 /* sysenter kernel code segment */
	272	#define SYSENTER_DS 0x0f /* sysenter kernel data segment */
	273	#define USER_CS 0x17 /* user code segment
	274	Must be SYSENTER_CS+16 for sysexit */
	275	/* Special case: sysenter with EFL_TF (trace bit) set - use iret not sysexit */
	276	#define SYSENTER_TF_CS (USER_CS\|0x10000)
	277	#define USER_DS 0x1f /* user data segment
	278	Must be SYSENTER_CS+24 for sysexit */
	279	#define USER64_CS 0x27 /* 64-bit user code segment
	280	Must be USER_CS+16 for sysret */
	281	#define USER64_DS USER_DS /* 64-bit user data segment == 32-bit */
	282	#define SYSCALL_CS 0x2f /* 64-bit syscall pseudo-segment */
	283	#define USER_CTHREAD 0x37 /* user cthread area */
	284	#define USER_SETTABLE 0x3f /* start of user settable ldt entries */
91447636	285	#define USLDTSZ 10 /* number of user settable entries */
1c79356b A	286
	287	/*
	288	* Kernel descriptors for MACH - 32-bit flat address space.
	289	*/
	290	#define KERNEL_CS 0x08 /* kernel code */
	291	#define KERNEL_DS 0x10 /* kernel data */
	292	#define KERNEL_LDT 0x18 /* master LDT */
0c530ab8 A	293	#define KERNEL_LDT_2 0x20 /* master LDT expanded for 64-bit */
	294	#define KERNEL_TSS 0x28 /* master TSS */
	295	#define KERNEL_TSS_2 0x30 /* master TSS expanded for 64-bit */
	296
	297	#define MC_TSS 0x38 /* machine-check handler TSS */
	298
91447636	299	#define CPU_DATA_GS 0x48 /* per-cpu data */
1c79356b	300
0c530ab8 A	301	#define DF_TSS 0x50 /* double-fault handler TSS */
0c530ab8 A	302
1c79356b A	303	#define USER_LDT 0x58
	304	#define USER_TSS 0x60
	305	#define FPE_CS 0x68
0c530ab8 A	306
	307	#define USER_WINDOW_SEL 0x70 /* window for copyin/copyout */
	308	#define PHYS_WINDOW_SEL 0x78 /* window for copyin/copyout */
	309
	310	#define KERNEL64_CS 0x80 /* kernel 64-bit code */
	311	#define KERNEL64_SS 0x88 /* kernel 64-bit (syscall) stack */
1c79356b A	312
1c79356b A	313	#if MACH_KDB
0c530ab8	314	#define DEBUG_TSS 0x90 /* debug TSS (uniprocessor) */
1c79356b	315	#endif
1c79356b	316
2d21ac55	317	#ifndef __ASSEMBLER__
0c530ab8 A	318	struct __gdt_desc_struct {
	319	unsigned short size;
	320	unsigned long address __attribute__((packed));
	321	unsigned short pad;
	322	} __attribute__ ((packed));
	323
	324	struct __idt_desc_struct {
	325	unsigned short size;
	326	unsigned long address __attribute__((packed));
	327	unsigned short pad;
	328	} __attribute__ ((packed));
2d21ac55	329	#endif /* __ASSEMBLER__ */
0c530ab8	330
1c79356b	331	#endif /* _I386_SEG_H_ */