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

/*
 * Copyright (c) 2000-2012 Apple 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_
#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 */

#define	GDTSZ		19

/*
 * 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 */
};

#define MAKE_REAL_DESCRIPTOR(base,lim,gran,acc) { \
	.limit_low = lim & 0xffff, \
	.limit_high = (lim >> 16) & 0xf, \
	.base_low = base & 0xffff, \
	.base_med = (base >> 16) & 0xff, \
	.base_high = (base >> 24) & 0xff, \
	.access = acc, \
	.granularity = gran \
}

/*
 * 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 {
	uint64_t	offset64;		/* 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 */
};

typedef struct __attribute__((packed)) {
	uint16_t	size;
	void		*ptr;
} x86_64_desc_register_t;

/*
 * Boot-time data for master (or only) CPU
 */
extern struct real_descriptor	master_gdt[GDTSZ];
extern struct real_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 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);

__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


/*
 * Kernel descriptors for MACH - 64-bit flat address space.
 */
#define KERNEL64_CS 	0x08		/* 1:  K64 code */
#define SYSENTER_CS 	0x0b 		/*     U32 sysenter pseudo-segment */
#define	KERNEL64_SS	0x10		/* 2:  KERNEL64_CS+8 for syscall */
#define USER_CS		0x1b		/* 3:  U32 code */
#define USER_DS		0x23		/* 4:  USER_CS+8 for sysret */
#define USER64_CS	0x2b		/* 5:  USER_CS+16 for sysret */
#define USER64_DS	USER_DS		/*     U64 data pseudo-segment */
#define KERNEL_LDT	0x30		/* 6:  */
					/* 7:  other 8 bytes of KERNEL_LDT */
#define KERNEL_TSS	0x40		/* 8:  */
					/* 9:  other 8 bytes of KERNEL_TSS */
#define KERNEL32_CS	0x50		/* 10: */
#define USER_LDT	0x58		/* 11: */
					/* 12: other 8 bytes of USER_LDT */
#define KERNEL_DS	0x68		/* 13: 32-bit kernel data */


#define SYSENTER_TF_CS	(USER_CS|0x10000)
#define	SYSENTER_DS	KERNEL64_SS	/* sysenter kernel data segment */

#ifdef __x86_64__
/*
 * 64-bit kernel LDT descriptors
 */
#define	SYSCALL_CS	0x07		/* syscall pseudo-segment */
#define	USER_CTHREAD	0x0f		/* user cthread area */
#define	USER_SETTABLE	0x1f		/* start of user settable ldt entries */
#endif

#endif	/* _I386_SEG_H_ */
Commit	Line	Data
1c79356b	1	/*
39236c6e	2	* Copyright (c) 2000-2012 Apple 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_
b0d623f7	58	#ifndef __ASSEMBLER__
91447636	59	#include <stdint.h>
0c530ab8	60	#include <mach/vm_types.h>
91447636	61	#include <architecture/i386/sel.h>
1c79356b A	62
	63	/*
	64	* i386 segmentation.
	65	*/
	66
91447636 A	67	static inline uint16_t
	68	sel_to_selector(sel_t sel)
	69	{
	70	union {
	71	sel_t sel;
	72	uint16_t selector;
	73	} tconv;
	74
	75	tconv.sel = sel;
	76
	77	return (tconv.selector);
	78	}
	79
	80	static inline sel_t
	81	selector_to_sel(uint16_t selector)
	82	{
	83	union {
	84	uint16_t selector;
	85	sel_t sel;
	86	} tconv;
	87
	88	tconv.selector = selector;
	89
	90	return (tconv.sel);
	91	}
	92
0c530ab8	93	#define LDTSZ 8192 /* size of the kernel ldt in entries */
2d21ac55 A	94	#define LDTSZ_MIN SEL_TO_INDEX(USER_SETTABLE)
2d21ac55 A	95	/* kernel ldt entries */
91447636	96
b0d623f7	97	#define GDTSZ 19
91447636 A	98
	99	/*
	100	* Interrupt table is always 256 entries long.
	101	*/
	102	#define IDTSZ 256
	103
91447636 A	104	#include <sys/cdefs.h>
91447636 A	105
1c79356b A	106	/*
	107	* Real segment descriptor.
	108	*/
	109	struct real_descriptor {
0c530ab8	110	uint32_t limit_low:16, /* limit 0..15 */
1c79356b A	111	base_low:16, /* base 0..15 */
	112	base_med:8, /* base 16..23 */
	113	access:8, /* access byte */
	114	limit_high:4, /* limit 16..19 */
	115	granularity:4, /* granularity */
	116	base_high:8; /* base 24..31 */
	117	};
0c530ab8 A	118	struct real_descriptor64 {
	119	uint32_t limit_low16:16, /* limit 0..15 */
	120	base_low16:16, /* base 0..15 */
	121	base_med8:8, /* base 16..23 */
	122	access8:8, /* access byte */
	123	limit_high4:4, /* limit 16..19 */
	124	granularity4:4, /* granularity */
	125	base_high8:8, /* base 24..31 */
	126	base_top32:32, /* base 32..63 */
	127	reserved32:32; /* reserved/zero */
	128	};
1c79356b	129	struct real_gate {
0c530ab8	130	uint32_t offset_low:16, /* offset 0..15 */
1c79356b A	131	selector:16,
	132	word_count:8,
	133	access:8,
	134	offset_high:16; /* offset 16..31 */
	135	};
0c530ab8 A	136	struct real_gate64 {
	137	uint32_t offset_low16:16, /* offset 0..15 */
	138	selector16:16,
	139	IST:3,
	140	zeroes5:5,
	141	access8:8,
	142	offset_high16:16, /* offset 16..31 */
	143	offset_top32:32, /* offset 32..63 */
	144	reserved32:32; /* reserved/zero */
	145	};
1c79356b	146
b0d623f7 A	147	#define MAKE_REAL_DESCRIPTOR(base,lim,gran,acc) { \
	148	.limit_low = lim & 0xffff, \
	149	.limit_high = (lim >> 16) & 0xf, \
	150	.base_low = base & 0xffff, \
	151	.base_med = (base >> 16) & 0xff, \
	152	.base_high = (base >> 24) & 0xff, \
	153	.access = acc, \
	154	.granularity = gran \
	155	}
	156
1c79356b A	157	/*
	158	* We build descriptors and gates in a 'fake' format to let the
	159	* fields be contiguous. We shuffle them into the real format
	160	* at runtime.
	161	*/
	162	struct fake_descriptor {
0c530ab8 A	163	uint32_t offset:32; /* offset */
0c530ab8 A	164	uint32_t lim_or_seg:20; /* limit */
1c79356b	165	/* or segment, for gate */
0c530ab8	166	uint32_t size_or_wdct:4; /* size/granularity */
1c79356b	167	/* word count, for gate */
0c530ab8	168	uint32_t access:8; /* access */
4452a7af	169	};
0c530ab8	170	struct fake_descriptor64 {
b0d623f7	171	uint64_t offset64; /* offset [0..31,32..63] */
0c530ab8 A	172	uint32_t lim_or_seg:20; /* limit */
	173	/* or segment, for gate */
	174	uint32_t size_or_IST:4; /* size/granularity */
	175	/* IST for gates */
	176	uint32_t access:8; /* access */
	177	uint32_t reserved:32; /* reserved/zero */
	178	};
91447636	179
5ba3f43e A	180	typedef struct __attribute__((packed)) {
	181	uint16_t size;
	182	void *ptr;
	183	} x86_64_desc_register_t;
	184
91447636 A	185	/*
	186	* Boot-time data for master (or only) CPU
	187	*/
b0d623f7 A	188	extern struct real_descriptor master_gdt[GDTSZ];
b0d623f7 A	189	extern struct real_descriptor master_ldt[LDTSZ];
0c530ab8 A	190	extern struct i386_tss master_ktss;
	191	extern struct sysenter_stack master_sstk;
	192
	193	extern struct fake_descriptor64 master_idt64[IDTSZ];
0c530ab8	194	extern struct x86_64_tss master_ktss64;
91447636 A	195
	196	__BEGIN_DECLS
	197
0c530ab8 A	198	extern char df_task_stack[];
	199	extern char df_task_stack_end[];
	200	extern struct i386_tss master_dftss;
	201	extern void df_task_start(void);
	202
	203	extern char mc_task_stack[];
	204	extern char mc_task_stack_end[];
	205	extern struct i386_tss master_mctss;
	206	extern void mc_task_start(void);
	207
91447636 A	208	__END_DECLS
91447636 A	209
1c79356b A	210	#endif /__ASSEMBLER__/
1c79356b A	211
0c530ab8	212	#define SZ_64 0x2 /* 64-bit segment */
1c79356b A	213	#define SZ_32 0x4 /* 32-bit segment */
	214	#define SZ_G 0x8 /* 4K limit field */
	215
	216	#define ACC_A 0x01 /* accessed */
	217	#define ACC_TYPE 0x1e /* type field: */
	218
	219	#define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
	220
	221	#define ACC_LDT 0x02 /* LDT */
	222	#define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
	223	#define ACC_TASK_GATE 0x05 /* task gate */
	224	#define ACC_TSS 0x09 /* task segment */
	225	#define ACC_CALL_GATE 0x0c /* call gate */
	226	#define ACC_INTR_GATE 0x0e /* interrupt gate */
	227	#define ACC_TRAP_GATE 0x0f /* trap gate */
	228
	229	#define ACC_TSS_BUSY 0x02 /* task busy */
	230
	231	#define ACC_TYPE_USER 0x10 /* user descriptors */
	232
	233	#define ACC_DATA 0x10 /* data */
	234	#define ACC_DATA_W 0x12 /* data, writable */
	235	#define ACC_DATA_E 0x14 /* data, expand-down */
	236	#define ACC_DATA_EW 0x16 /* data, expand-down,
	237	writable */
	238	#define ACC_CODE 0x18 /* code */
	239	#define ACC_CODE_R 0x1a /* code, readable */
	240	#define ACC_CODE_C 0x1c /* code, conforming */
	241	#define ACC_CODE_CR 0x1e /* code, conforming,
	242	readable */
	243	#define ACC_PL 0x60 /* access rights: */
	244	#define ACC_PL_K 0x00 /* kernel access only */
	245	#define ACC_PL_U 0x60 /* user access */
	246	#define ACC_P 0x80 /* segment present */
	247
	248	/*
	249	* Components of a selector
	250	*/
	251	#define SEL_LDTS 0x04 /* local selector */
	252	#define SEL_PL 0x03 /* privilege level: */
	253	#define SEL_PL_K 0x00 /* kernel selector */
	254	#define SEL_PL_U 0x03 /* user selector */
	255
	256	/*
	257	* Convert selector to descriptor table index.
	258	*/
91447636	259	#define sel_idx(sel) (selector_to_sel(sel).index)
0c530ab8	260	#define SEL_TO_INDEX(s) ((s)>>3)
91447636 A	261
91447636 A	262	#define NULL_SEG 0
1c79356b	263
0c530ab8	264
b0d623f7 A	265	/*
	266	* Kernel descriptors for MACH - 64-bit flat address space.
	267	*/
060df5ea A	268	#define KERNEL64_CS 0x08 /* 1: K64 code */
	269	#define SYSENTER_CS 0x0b /* U32 sysenter pseudo-segment */
	270	#define KERNEL64_SS 0x10 /* 2: KERNEL64_CS+8 for syscall */
	271	#define USER_CS 0x1b /* 3: U32 code */
	272	#define USER_DS 0x23 /* 4: USER_CS+8 for sysret */
	273	#define USER64_CS 0x2b /* 5: USER_CS+16 for sysret */
	274	#define USER64_DS USER_DS /* U64 data pseudo-segment */
b0d623f7 A	275	#define KERNEL_LDT 0x30 /* 6: */
	276	/* 7: other 8 bytes of KERNEL_LDT */
	277	#define KERNEL_TSS 0x40 /* 8: */
	278	/* 9: other 8 bytes of KERNEL_TSS */
	279	#define KERNEL32_CS 0x50 /* 10: */
	280	#define USER_LDT 0x58 /* 11: */
	281	/* 12: other 8 bytes of USER_LDT */
060df5ea	282	#define KERNEL_DS 0x68 /* 13: 32-bit kernel data */
b0d623f7	283
b0d623f7	284
b0d623f7 A	285	#define SYSENTER_TF_CS (USER_CS\|0x10000)
b0d623f7 A	286	#define SYSENTER_DS KERNEL64_SS /* sysenter kernel data segment */
1c79356b	287
b0d623f7 A	288	#ifdef __x86_64__
	289	/*
	290	* 64-bit kernel LDT descriptors
	291	*/
060df5ea	292	#define SYSCALL_CS 0x07 /* syscall pseudo-segment */
b0d623f7 A	293	#define USER_CTHREAD 0x0f /* user cthread area */
b0d623f7 A	294	#define USER_SETTABLE 0x1f /* start of user settable ldt entries */
b0d623f7	295	#endif
0c530ab8	296
1c79356b	297	#endif /* _I386_SEG_H_ */