[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / desc_defs.h

/* Written 2000 by Andi Kleen */
#ifndef _ASM_X86_DESC_DEFS_H
#define _ASM_X86_DESC_DEFS_H

/*
 * Segment descriptor structure definitions, usable from both x86_64 and i386
 * archs.
 */

#ifndef __ASSEMBLY__

#include <linux/types.h>

/*
 * FIXME: Accessing the desc_struct through its fields is more elegant,
 * and should be the one valid thing to do. However, a lot of open code
 * still touches the a and b accessors, and doing this allow us to do it
 * incrementally. We keep the signature as a struct, rather than a union,
 * so we can get rid of it transparently in the future -- glommer
 */
/* 8 byte segment descriptor */
struct desc_struct {
	union {
		struct {
			unsigned int a;
			unsigned int b;
		};
		struct {
			u16 limit0;
			u16 base0;
			unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1;
			unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
		};
	};
} __attribute__((packed));

#define GDT_ENTRY_INIT(flags, base, limit) { { { \
		.a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \
		.b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \
			((limit) & 0xf0000) | ((base) & 0xff000000), \
	} } }

enum {
	GATE_INTERRUPT = 0xE,
	GATE_TRAP = 0xF,
	GATE_CALL = 0xC,
	GATE_TASK = 0x5,
};

/* 16byte gate */
struct gate_struct64 {
	u16 offset_low;
	u16 segment;
	unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
	u16 offset_middle;
	u32 offset_high;
	u32 zero1;
} __attribute__((packed));

#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF)
#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)

enum {
	DESC_TSS = 0x9,
	DESC_LDT = 0x2,
	DESCTYPE_S = 0x10,	/* !system */
};

/* LDT or TSS descriptor in the GDT. 16 bytes. */
struct ldttss_desc64 {
	u16 limit0;
	u16 base0;
	unsigned base1 : 8, type : 5, dpl : 2, p : 1;
	unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
	u32 base3;
	u32 zero1;
} __attribute__((packed));

#ifdef CONFIG_X86_64
typedef struct gate_struct64 gate_desc;
typedef struct ldttss_desc64 ldt_desc;
typedef struct ldttss_desc64 tss_desc;
#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
#define gate_segment(g) ((g).segment)
#else
typedef struct desc_struct gate_desc;
typedef struct desc_struct ldt_desc;
typedef struct desc_struct tss_desc;
#define gate_offset(g)		(((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
#define gate_segment(g)		((g).a >> 16)
#endif

struct desc_ptr {
	unsigned short size;
	unsigned long address;
} __attribute__((packed)) ;

#endif /* !__ASSEMBLY__ */

/* Access rights as returned by LAR */
#define AR_TYPE_RODATA		(0 * (1 << 9))
#define AR_TYPE_RWDATA		(1 * (1 << 9))
#define AR_TYPE_RODATA_EXPDOWN	(2 * (1 << 9))
#define AR_TYPE_RWDATA_EXPDOWN	(3 * (1 << 9))
#define AR_TYPE_XOCODE		(4 * (1 << 9))
#define AR_TYPE_XRCODE		(5 * (1 << 9))
#define AR_TYPE_XOCODE_CONF	(6 * (1 << 9))
#define AR_TYPE_XRCODE_CONF	(7 * (1 << 9))
#define AR_TYPE_MASK		(7 * (1 << 9))

#define AR_DPL0			(0 * (1 << 13))
#define AR_DPL3			(3 * (1 << 13))
#define AR_DPL_MASK		(3 * (1 << 13))

#define AR_A			(1 << 8)   /* "Accessed" */
#define AR_S			(1 << 12)  /* If clear, "System" segment */
#define AR_P			(1 << 15)  /* "Present" */
#define AR_AVL			(1 << 20)  /* "AVaiLable" (no HW effect) */
#define AR_L			(1 << 21)  /* "Long mode" for code segments */
#define AR_DB			(1 << 22)  /* D/B, effect depends on type */
#define AR_G			(1 << 23)  /* "Granularity" (limit in pages) */

#endif /* _ASM_X86_DESC_DEFS_H */
Commit	Line	Data
249e83fe	1	/* Written 2000 by Andi Kleen */
1965aae3 PA	2	#ifndef _ASM_X86_DESC_DEFS_H
1965aae3 PA	3	#define _ASM_X86_DESC_DEFS_H
249e83fe AK	4
	5	/*
	6	* Segment descriptor structure definitions, usable from both x86_64 and i386
	7	* archs.
	8	*/
	9
	10	#ifndef __ASSEMBLY__
	11
	12	#include <linux/types.h>
	13
6842ef0e	14	/*
af901ca1	15	* FIXME: Accessing the desc_struct through its fields is more elegant,
6842ef0e	16	* and should be the one valid thing to do. However, a lot of open code
af901ca1	17	* still touches the a and b accessors, and doing this allow us to do it
03440c4e	18	* incrementally. We keep the signature as a struct, rather than a union,
6842ef0e GOC	19	* so we can get rid of it transparently in the future -- glommer
6842ef0e GOC	20	*/
b7761900	21	/* 8 byte segment descriptor */
249e83fe	22	struct desc_struct {
6842ef0e	23	union {
b7761900 JP	24	struct {
	25	unsigned int a;
	26	unsigned int b;
	27	};
6842ef0e GOC	28	struct {
	29	u16 limit0;
	30	u16 base0;
	31	unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1;
	32	unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
	33	};
6842ef0e GOC	34	};
6842ef0e GOC	35	} __attribute__((packed));
249e83fe	36
1e5de182 AM	37	#define GDT_ENTRY_INIT(flags, base, limit) { { { \
	38	.a = ((limit) & 0xffff) \| (((base) & 0xffff) << 16), \
	39	.b = (((base) & 0xff0000) >> 16) \| (((flags) & 0xf0ff) << 8) \| \
	40	((limit) & 0xf0000) \| ((base) & 0xff000000), \
	41	} } }
	42
249e83fe AK	43	enum {
	44	GATE_INTERRUPT = 0xE,
	45	GATE_TRAP = 0xF,
	46	GATE_CALL = 0xC,
507f90c9	47	GATE_TASK = 0x5,
249e83fe AK	48	};
249e83fe AK	49
b7761900	50	/* 16byte gate */
010d4f82	51	struct gate_struct64 {
249e83fe AK	52	u16 offset_low;
	53	u16 segment;
	54	unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
	55	u16 offset_middle;
	56	u32 offset_high;
	57	u32 zero1;
	58	} __attribute__((packed));
	59
54cd0eac GOC	60	#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF)
	61	#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
	62	#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)
249e83fe AK	63
	64	enum {
	65	DESC_TSS = 0x9,
	66	DESC_LDT = 0x2,
b7761900	67	DESCTYPE_S = 0x10, /* !system */
249e83fe AK	68	};
249e83fe AK	69
b7761900	70	/* LDT or TSS descriptor in the GDT. 16 bytes. */
25deca53	71	struct ldttss_desc64 {
249e83fe AK	72	u16 limit0;
	73	u16 base0;
	74	unsigned base1 : 8, type : 5, dpl : 2, p : 1;
	75	unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
	76	u32 base3;
	77	u32 zero1;
	78	} __attribute__((packed));
	79
010d4f82 GOC	80	#ifdef CONFIG_X86_64
010d4f82 GOC	81	typedef struct gate_struct64 gate_desc;
25deca53	82	typedef struct ldttss_desc64 ldt_desc;
18245d5b	83	typedef struct ldttss_desc64 tss_desc;
43adfc26 JF	84	#define gate_offset(g) ((g).offset_low \| ((unsigned long)(g).offset_middle << 16) \| ((unsigned long)(g).offset_high << 32))
43adfc26 JF	85	#define gate_segment(g) ((g).segment)
010d4f82 GOC	86	#else
010d4f82 GOC	87	typedef struct desc_struct gate_desc;
25deca53	88	typedef struct desc_struct ldt_desc;
18245d5b	89	typedef struct desc_struct tss_desc;
43adfc26 JF	90	#define gate_offset(g) (((g).b & 0xffff0000) \| ((g).a & 0x0000ffff))
43adfc26 JF	91	#define gate_segment(g) ((g).a >> 16)
010d4f82 GOC	92	#endif
010d4f82 GOC	93
249e83fe AK	94	struct desc_ptr {
	95	unsigned short size;
	96	unsigned long address;
	97	} __attribute__((packed)) ;
	98
249e83fe AK	99	#endif /* !__ASSEMBLY__ */
249e83fe AK	100
8ff5bd2e AL	101	/* Access rights as returned by LAR */
	102	#define AR_TYPE_RODATA (0 * (1 << 9))
	103	#define AR_TYPE_RWDATA (1 * (1 << 9))
	104	#define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9))
	105	#define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9))
	106	#define AR_TYPE_XOCODE (4 * (1 << 9))
	107	#define AR_TYPE_XRCODE (5 * (1 << 9))
	108	#define AR_TYPE_XOCODE_CONF (6 * (1 << 9))
	109	#define AR_TYPE_XRCODE_CONF (7 * (1 << 9))
	110	#define AR_TYPE_MASK (7 * (1 << 9))
	111
	112	#define AR_DPL0 (0 * (1 << 13))
	113	#define AR_DPL3 (3 * (1 << 13))
	114	#define AR_DPL_MASK (3 * (1 << 13))
	115
	116	#define AR_A (1 << 8) /* "Accessed" */
	117	#define AR_S (1 << 12) /* If clear, "System" segment */
	118	#define AR_P (1 << 15) /* "Present" */
	119	#define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */
	120	#define AR_L (1 << 21) /* "Long mode" for code segments */
	121	#define AR_DB (1 << 22) /* D/B, effect depends on type */
	122	#define AR_G (1 << 23) /* "Granularity" (limit in pages) */
	123
1965aae3	124	#endif /* _ASM_X86_DESC_DEFS_H */