[dragonfly.git] / sys / cpu / i386 / include / segments.h

/*-
 * Copyright (c) 1989, 1990 William F. Jolitz
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	from: @(#)segments.h	7.1 (Berkeley) 5/9/91
 * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $
 */

#ifndef _CPU_SEGMENTS_H_
#define	_CPU_SEGMENTS_H_

/*
 * 386 Segmentation Data Structures and definitions
 *	William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
 */

/*
 * Selectors
 */

#define SEL_RPL_MASK	0x0003

#define	ISPL(s)	((s)&3)		/* what is the priority level of a selector */
#define	SEL_KPL	0		/* kernel priority level */
#define	SEL_UPL	3		/* user priority level */
#define	ISLDT(s)	((s)&SEL_LDT)	/* is it local or global */
#define	SEL_LDT	4		/* local descriptor table */
#define	IDXSEL(s)	(((s)>>3) & 0x1fff)		/* index of selector */
#define	LSEL(s,r)	(((s)<<3) | SEL_LDT | r)	/* a local selector */
#define	GSEL(s,r)	(((s)<<3) | r)			/* a global selector */

#ifndef LOCORE

/*
 * Memory and System segment descriptors
 */
struct	segment_descriptor	{
	unsigned sd_lolimit:16 ;	/* segment extent (lsb) */
	unsigned sd_lobase:24 __attribute__ ((packed));
					/* segment base address (lsb) */
	unsigned sd_type:5 ;		/* segment type */
	unsigned sd_dpl:2 ;		/* segment descriptor priority level */
	unsigned sd_p:1 ;		/* segment descriptor present */
	unsigned sd_hilimit:4 ;		/* segment extent (msb) */
	unsigned sd_xx:2 ;		/* unused */
	unsigned sd_def32:1 ;		/* default 32 vs 16 bit size */
	unsigned sd_gran:1 ;		/* limit granularity (byte/page units)*/
	unsigned sd_hibase:8 ;		/* segment base address  (msb) */
} ;

/*
 * Gate descriptors (e.g. indirect descriptors)
 */
struct	gate_descriptor	{
	unsigned gd_looffset:16 ;	/* gate offset (lsb) */
	unsigned gd_selector:16 ;	/* gate segment selector */
	unsigned gd_stkcpy:5 ;		/* number of stack wds to cpy */
	unsigned gd_xx:3 ;		/* unused */
	unsigned gd_type:5 ;		/* segment type */
	unsigned gd_dpl:2 ;		/* segment descriptor priority level */
	unsigned gd_p:1 ;		/* segment descriptor present */
	unsigned gd_hioffset:16 ;	/* gate offset (msb) */
} ;

/*
 * Generic descriptor
 */
union	descriptor	{
	struct	segment_descriptor sd;
	struct	gate_descriptor gd;
};

#endif

	/* system segments and gate types */
#define	SDT_SYSNULL	 0	/* system null */
#define	SDT_SYS286TSS	 1	/* system 286 TSS available */
#define	SDT_SYSLDT	 2	/* system local descriptor table */
#define	SDT_SYS286BSY	 3	/* system 286 TSS busy */
#define	SDT_SYS286CGT	 4	/* system 286 call gate */
#define	SDT_SYSTASKGT	 5	/* system task gate */
#define	SDT_SYS286IGT	 6	/* system 286 interrupt gate */
#define	SDT_SYS286TGT	 7	/* system 286 trap gate */
#define	SDT_SYSNULL2	 8	/* system null again */
#define	SDT_SYS386TSS	 9	/* system 386 TSS available */
#define	SDT_SYSNULL3	10	/* system null again */
#define	SDT_SYS386BSY	11	/* system 386 TSS busy */
#define	SDT_SYS386CGT	12	/* system 386 call gate */
#define	SDT_SYSNULL4	13	/* system null again */
#define	SDT_SYS386IGT	14	/* system 386 interrupt gate */
#define	SDT_SYS386TGT	15	/* system 386 trap gate */

	/* memory segment types */
#define	SDT_MEMRO	16	/* memory read only */
#define	SDT_MEMROA	17	/* memory read only accessed */
#define	SDT_MEMRW	18	/* memory read write */
#define	SDT_MEMRWA	19	/* memory read write accessed */
#define	SDT_MEMROD	20	/* memory read only expand dwn limit */
#define	SDT_MEMRODA	21	/* memory read only expand dwn limit accessed */
#define	SDT_MEMRWD	22	/* memory read write expand dwn limit */
#define	SDT_MEMRWDA	23	/* memory read write expand dwn limit accessed */
#define	SDT_MEME	24	/* memory execute only */
#define	SDT_MEMEA	25	/* memory execute only accessed */
#define	SDT_MEMER	26	/* memory execute read */
#define	SDT_MEMERA	27	/* memory execute read accessed */
#define	SDT_MEMEC	28	/* memory execute only conforming */
#define	SDT_MEMEAC	29	/* memory execute only accessed conforming */
#define	SDT_MEMERC	30	/* memory execute read conforming */
#define	SDT_MEMERAC	31	/* memory execute read accessed conforming */

#ifndef LOCORE

/* is memory segment descriptor pointer ? */
#define ISMEMSDP(s)	((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC)

/* is 286 gate descriptor pointer ? */
#define IS286GDP(s)	(((s->d_type) >= SDT_SYS286CGT \
				 && (s->d_type) < SDT_SYS286TGT))

/* is 386 gate descriptor pointer ? */
#define IS386GDP(s)	(((s->d_type) >= SDT_SYS386CGT \
				&& (s->d_type) < SDT_SYS386TGT))

/* is gate descriptor pointer ? */
#define ISGDP(s)	(IS286GDP(s) || IS386GDP(s))

/* is segment descriptor pointer ? */
#define ISSDP(s)	(ISMEMSDP(s) || !ISGDP(s))

/* is system segment descriptor pointer ? */
#define ISSYSSDP(s)	(!ISMEMSDP(s) && !ISGDP(s))

/*
 * Software definitions are in this convenient format,
 * which are translated into inconvenient segment descriptors
 * when needed to be used by the 386 hardware
 */

struct	soft_segment_descriptor	{
	unsigned ssd_base ;		/* segment base address  */
	unsigned ssd_limit ;		/* segment extent */
	unsigned ssd_type:5 ;		/* segment type */
	unsigned ssd_dpl:2 ;		/* segment descriptor priority level */
	unsigned ssd_p:1 ;		/* segment descriptor present */
	unsigned ssd_xx:4 ;		/* unused */
	unsigned ssd_xx1:2 ;		/* unused */
	unsigned ssd_def32:1 ;		/* default 32 vs 16 bit size */
	unsigned ssd_gran:1 ;		/* limit granularity (byte/page units)*/
};

/*
 * region descriptors, used to load gdt/idt tables before segments yet exist.
 */
struct region_descriptor {
	unsigned rd_limit:16;				/* segment extent */
	unsigned rd_base:32 __attribute__ ((packed));	/* base address  */
};

#endif

/*
 * Segment Protection Exception code bits
 */

#define	SEGEX_EXT	0x01	/* recursive or externally induced */
#define	SEGEX_IDT	0x02	/* interrupt descriptor table */
#define	SEGEX_TI	0x04	/* local descriptor table */
				/* other bits are affected descriptor index */
#define SEGEX_IDX(s)	(((s)>>3)&0x1fff)

/*
 * Size of IDT table.  Theoretically we only need to cover past 0x81
 * (NIDT=130) if not running APIC_IO or SMP, but at this point we might
 * as well just use all of them.
 */
#define	NIDT	256		/* we use them all */

/*
 * Entries in the Global Descriptor Table (GDT)
 */
#define	GNULL_SEL	0	/* Null Descriptor */
#define	GCODE_SEL	1	/* Kernel Code Descriptor */
#define	GDATA_SEL	2	/* Kernel Data Descriptor */
#define	GPRIV_SEL	3	/* SMP Per-Processor Private Data */
#define	GPROC0_SEL	4	/* Task state process slot zero and up */
#define	GLDT_SEL	5	/* LDT - eventually one per process */
#define	GUSERLDT_SEL	6	/* User LDT */
#define	GTGATE_SEL	7	/* Process task switch gate */
#define	GBIOSLOWMEM_SEL	8	/* BIOS low memory access (must be entry 8) */
#define	GPANIC_SEL	9	/* Task state to consider panic from */
#define GBIOSCODE32_SEL	10	/* BIOS interface (32bit Code) */
#define GBIOSCODE16_SEL	11	/* BIOS interface (16bit Code) */
#define GBIOSDATA_SEL	12	/* BIOS interface (Data) */
#define GBIOSUTIL_SEL	13	/* BIOS interface (Utility) */
#define GBIOSARGS_SEL	14	/* BIOS interface (Arguments) */
#define	GTLS_START	15	/* Thread TLS Descriptor */
#define	GTLS_END	17	/* Thread TLS Descriptor */
#define	GNDIS_SEL	18	/* For the NDIS layer */

#define NGTLS		(GTLS_END - GTLS_START + 1)
#ifdef BDE_DEBUGGER
#define	NGDT		21	/* some of 11-17 are reserved for debugger */
#else
#define NGDT 		19
#endif

/*
 * Entries in the Local Descriptor Table (LDT)
 */
#define	LSYS5CALLS_SEL	0	/* forced by intel BCS */
#define	LSYS5SIGR_SEL	1
#define	L43BSDCALLS_SEL	2	/* notyet */
#define	LUCODE_SEL	3
#define LSOL26CALLS_SEL	4	/* Solaris >= 2.6 system call gate */
#define	LUDATA_SEL	5
/* separate stack, es,fs,gs sels ? */
/* #define	LPOSIXCALLS_SEL	5*/	/* notyet */
#define LBSDICALLS_SEL	16	/* BSDI system call gate */
#define NLDT		(LBSDICALLS_SEL + 1)

#ifndef LOCORE

struct savetls {
	struct segment_descriptor tls[NGTLS];
};

#endif

#if defined(_KERNEL) && !defined(LOCORE)

#ifndef _SYS_TYPES_H_
#include <sys/types.h>
#endif

extern int	_default_ldt;
extern union descriptor gdt[];
extern struct soft_segment_descriptor gdt_segs[];
extern struct gate_descriptor *idt;
extern union descriptor ldt[NLDT];
extern struct mtx dt_lock;

void	lgdt		(struct region_descriptor *rdp);
void	lidt		(struct region_descriptor *rdp);
void	lldt		(u_short sel);
void	sdtossd		(struct segment_descriptor *sdp,
			     struct soft_segment_descriptor *ssdp);
void	ssdtosd		(struct soft_segment_descriptor *ssdp,
			     struct segment_descriptor *sdp);
#endif /* _KERNEL */

#endif /* !_CPU_SEGMENTS_H_ */
Commit	Line	Data
984263bc MD	1	/*-
	2	* Copyright (c) 1989, 1990 William F. Jolitz
	3	* Copyright (c) 1990 The Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* William Jolitz.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. All advertising materials mentioning features or use of this software
	18	* must display the following acknowledgement:
	19	* This product includes software developed by the University of
	20	* California, Berkeley and its contributors.
	21	* 4. Neither the name of the University nor the names of its contributors
	22	* may be used to endorse or promote products derived from this software
	23	* without specific prior written permission.
	24	*
	25	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	26	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	27	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	28	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	29	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	30	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	31	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	32	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	33	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	34	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	35	* SUCH DAMAGE.
	36	*
	37	* from: @(#)segments.h 7.1 (Berkeley) 5/9/91
	38	* $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $
	39	*/
	40
a9295349 MD	41	#ifndef _CPU_SEGMENTS_H_
a9295349 MD	42	#define _CPU_SEGMENTS_H_
984263bc	43
984263bc MD	44	/*
	45	* 386 Segmentation Data Structures and definitions
	46	* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
	47	*/
	48
	49	/*
	50	* Selectors
	51	*/
	52
bdc560a1 MD	53	#define SEL_RPL_MASK 0x0003
bdc560a1 MD	54
984263bc MD	55	#define ISPL(s) ((s)&3) /* what is the priority level of a selector */
	56	#define SEL_KPL 0 /* kernel priority level */
	57	#define SEL_UPL 3 /* user priority level */
	58	#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */
	59	#define SEL_LDT 4 /* local descriptor table */
	60	#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */
	61	#define LSEL(s,r) (((s)<<3) \| SEL_LDT \| r) /* a local selector */
	62	#define GSEL(s,r) (((s)<<3) \| r) /* a global selector */
	63
bdc560a1 MD	64	#ifndef LOCORE
bdc560a1 MD	65
984263bc MD	66	/*
	67	* Memory and System segment descriptors
	68	*/
	69	struct segment_descriptor {
	70	unsigned sd_lolimit:16 ; /* segment extent (lsb) */
	71	unsigned sd_lobase:24 __attribute__ ((packed));
	72	/* segment base address (lsb) */
	73	unsigned sd_type:5 ; /* segment type */
	74	unsigned sd_dpl:2 ; /* segment descriptor priority level */
	75	unsigned sd_p:1 ; /* segment descriptor present */
	76	unsigned sd_hilimit:4 ; /* segment extent (msb) */
	77	unsigned sd_xx:2 ; /* unused */
	78	unsigned sd_def32:1 ; /* default 32 vs 16 bit size */
	79	unsigned sd_gran:1 ; /* limit granularity (byte/page units)*/
	80	unsigned sd_hibase:8 ; /* segment base address (msb) */
	81	} ;
	82
	83	/*
	84	* Gate descriptors (e.g. indirect descriptors)
	85	*/
	86	struct gate_descriptor {
	87	unsigned gd_looffset:16 ; /* gate offset (lsb) */
	88	unsigned gd_selector:16 ; /* gate segment selector */
	89	unsigned gd_stkcpy:5 ; /* number of stack wds to cpy */
	90	unsigned gd_xx:3 ; /* unused */
	91	unsigned gd_type:5 ; /* segment type */
	92	unsigned gd_dpl:2 ; /* segment descriptor priority level */
	93	unsigned gd_p:1 ; /* segment descriptor present */
	94	unsigned gd_hioffset:16 ; /* gate offset (msb) */
	95	} ;
	96
	97	/*
	98	* Generic descriptor
	99	*/
	100	union descriptor {
	101	struct segment_descriptor sd;
	102	struct gate_descriptor gd;
	103	};
	104
bdc560a1 MD	105	#endif
bdc560a1 MD	106
984263bc MD	107	/* system segments and gate types */
	108	#define SDT_SYSNULL 0 /* system null */
	109	#define SDT_SYS286TSS 1 /* system 286 TSS available */
	110	#define SDT_SYSLDT 2 /* system local descriptor table */
	111	#define SDT_SYS286BSY 3 /* system 286 TSS busy */
	112	#define SDT_SYS286CGT 4 /* system 286 call gate */
	113	#define SDT_SYSTASKGT 5 /* system task gate */
	114	#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
	115	#define SDT_SYS286TGT 7 /* system 286 trap gate */
	116	#define SDT_SYSNULL2 8 /* system null again */
	117	#define SDT_SYS386TSS 9 /* system 386 TSS available */
	118	#define SDT_SYSNULL3 10 /* system null again */
	119	#define SDT_SYS386BSY 11 /* system 386 TSS busy */
	120	#define SDT_SYS386CGT 12 /* system 386 call gate */
	121	#define SDT_SYSNULL4 13 /* system null again */
	122	#define SDT_SYS386IGT 14 /* system 386 interrupt gate */
	123	#define SDT_SYS386TGT 15 /* system 386 trap gate */
	124
	125	/* memory segment types */
	126	#define SDT_MEMRO 16 /* memory read only */
	127	#define SDT_MEMROA 17 /* memory read only accessed */
	128	#define SDT_MEMRW 18 /* memory read write */
	129	#define SDT_MEMRWA 19 /* memory read write accessed */
	130	#define SDT_MEMROD 20 /* memory read only expand dwn limit */
	131	#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
	132	#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
	133	#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */
	134	#define SDT_MEME 24 /* memory execute only */
	135	#define SDT_MEMEA 25 /* memory execute only accessed */
	136	#define SDT_MEMER 26 /* memory execute read */
	137	#define SDT_MEMERA 27 /* memory execute read accessed */
	138	#define SDT_MEMEC 28 /* memory execute only conforming */
	139	#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
	140	#define SDT_MEMERC 30 /* memory execute read conforming */
	141	#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
	142
bdc560a1 MD	143	#ifndef LOCORE
bdc560a1 MD	144
984263bc MD	145	/* is memory segment descriptor pointer ? */
	146	#define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC)
	147
	148	/* is 286 gate descriptor pointer ? */
	149	#define IS286GDP(s) (((s->d_type) >= SDT_SYS286CGT \
	150	&& (s->d_type) < SDT_SYS286TGT))
	151
	152	/* is 386 gate descriptor pointer ? */
	153	#define IS386GDP(s) (((s->d_type) >= SDT_SYS386CGT \
	154	&& (s->d_type) < SDT_SYS386TGT))
	155
	156	/* is gate descriptor pointer ? */
	157	#define ISGDP(s) (IS286GDP(s) \|\| IS386GDP(s))
	158
	159	/* is segment descriptor pointer ? */
	160	#define ISSDP(s) (ISMEMSDP(s) \|\| !ISGDP(s))
	161
	162	/* is system segment descriptor pointer ? */
	163	#define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
	164
	165	/*
	166	* Software definitions are in this convenient format,
	167	* which are translated into inconvenient segment descriptors
	168	* when needed to be used by the 386 hardware
	169	*/
	170
	171	struct soft_segment_descriptor {
	172	unsigned ssd_base ; /* segment base address */
	173	unsigned ssd_limit ; /* segment extent */
	174	unsigned ssd_type:5 ; /* segment type */
	175	unsigned ssd_dpl:2 ; /* segment descriptor priority level */
	176	unsigned ssd_p:1 ; /* segment descriptor present */
	177	unsigned ssd_xx:4 ; /* unused */
	178	unsigned ssd_xx1:2 ; /* unused */
	179	unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
	180	unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
	181	};
	182
	183	/*
	184	* region descriptors, used to load gdt/idt tables before segments yet exist.
	185	*/
	186	struct region_descriptor {
	187	unsigned rd_limit:16; /* segment extent */
	188	unsigned rd_base:32 __attribute__ ((packed)); /* base address */
	189	};
	190
bdc560a1 MD	191	#endif
bdc560a1 MD	192
984263bc MD	193	/*
	194	* Segment Protection Exception code bits
	195	*/
	196
	197	#define SEGEX_EXT 0x01 /* recursive or externally induced */
	198	#define SEGEX_IDT 0x02 /* interrupt descriptor table */
	199	#define SEGEX_TI 0x04 /* local descriptor table */
	200	/* other bits are affected descriptor index */
81c02e76	201	#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
984263bc MD	202
984263bc MD	203	/*
97359a5b MD	204	* Size of IDT table. Theoretically we only need to cover past 0x81
	205	* (NIDT=130) if not running APIC_IO or SMP, but at this point we might
	206	* as well just use all of them.
984263bc	207	*/
984263bc	208	#define NIDT 256 /* we use them all */
984263bc MD	209
	210	/*
	211	* Entries in the Global Descriptor Table (GDT)
	212	*/
	213	#define GNULL_SEL 0 /* Null Descriptor */
	214	#define GCODE_SEL 1 /* Kernel Code Descriptor */
	215	#define GDATA_SEL 2 /* Kernel Data Descriptor */
	216	#define GPRIV_SEL 3 /* SMP Per-Processor Private Data */
	217	#define GPROC0_SEL 4 /* Task state process slot zero and up */
	218	#define GLDT_SEL 5 /* LDT - eventually one per process */
	219	#define GUSERLDT_SEL 6 /* User LDT */
	220	#define GTGATE_SEL 7 /* Process task switch gate */
	221	#define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */
	222	#define GPANIC_SEL 9 /* Task state to consider panic from */
	223	#define GBIOSCODE32_SEL 10 /* BIOS interface (32bit Code) */
	224	#define GBIOSCODE16_SEL 11 /* BIOS interface (16bit Code) */
	225	#define GBIOSDATA_SEL 12 /* BIOS interface (Data) */
	226	#define GBIOSUTIL_SEL 13 /* BIOS interface (Utility) */
	227	#define GBIOSARGS_SEL 14 /* BIOS interface (Arguments) */
806bf111 MD	228	#define GTLS_START 15 /* Thread TLS Descriptor */
806bf111 MD	229	#define GTLS_END 17 /* Thread TLS Descriptor */
efba76b4	230	#define GNDIS_SEL 18 /* For the NDIS layer */
984263bc	231
806bf111	232	#define NGTLS (GTLS_END - GTLS_START + 1)
984263bc	233	#ifdef BDE_DEBUGGER
806bf111	234	#define NGDT 21 /* some of 11-17 are reserved for debugger */
984263bc	235	#else
efba76b4	236	#define NGDT 19
984263bc MD	237	#endif
	238
	239	/*
	240	* Entries in the Local Descriptor Table (LDT)
	241	*/
	242	#define LSYS5CALLS_SEL 0 /* forced by intel BCS */
	243	#define LSYS5SIGR_SEL 1
	244	#define L43BSDCALLS_SEL 2 /* notyet */
	245	#define LUCODE_SEL 3
	246	#define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */
	247	#define LUDATA_SEL 5
	248	/* separate stack, es,fs,gs sels ? */
	249	/* #define LPOSIXCALLS_SEL 5/ / notyet */
	250	#define LBSDICALLS_SEL 16 /* BSDI system call gate */
	251	#define NLDT (LBSDICALLS_SEL + 1)
	252
4e7c41c5 MD	253	#ifndef LOCORE
	254
	255	struct savetls {
	256	struct segment_descriptor tls[NGTLS];
	257	};
	258
	259	#endif
	260
bdc560a1	261	#if defined(_KERNEL) && !defined(LOCORE)
1bd40720 MD	262
	263	#ifndef _SYS_TYPES_H_
	264	#include <sys/types.h>
	265	#endif
	266
984263bc MD	267	extern int _default_ldt;
	268	extern union descriptor gdt[];
	269	extern struct soft_segment_descriptor gdt_segs[];
	270	extern struct gate_descriptor *idt;
	271	extern union descriptor ldt[NLDT];
7773e565	272	extern struct mtx dt_lock;
984263bc	273
3ae0cd58 RG	274	void lgdt (struct region_descriptor *rdp);
	275	void lidt (struct region_descriptor *rdp);
	276	void lldt (u_short sel);
	277	void sdtossd (struct segment_descriptor *sdp,
	278	struct soft_segment_descriptor *ssdp);
	279	void ssdtosd (struct soft_segment_descriptor *ssdp,
	280	struct segment_descriptor *sdp);
984263bc MD	281	#endif /* _KERNEL */
984263bc MD	282
a9295349	283	#endif /* !_CPU_SEGMENTS_H_ */