[deliverable/linux.git] / include / asm-x86 / desc_defs.h

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

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

#ifndef __ASSEMBLY__

#include <linux/types.h>

// 8 byte segment descriptor
struct desc_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));

struct n_desc_struct {
	unsigned int a,b;
};

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

// 16byte gate
struct gate_struct {
	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)(x) & 0xFFFF)
#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
#define PTR_HIGH(x) ((unsigned long)(x) >> 32)

enum {
	DESC_TSS = 0x9,
	DESC_LDT = 0x2,
};

// LDT or TSS descriptor in the GDT. 16 bytes.
struct ldttss_desc {
	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));

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


#endif /* !__ASSEMBLY__ */

#endif
Commit	Line	Data
249e83fe AK	1	/* Written 2000 by Andi Kleen */
	2	#ifndef __ARCH_DESC_DEFS_H
	3	#define __ARCH_DESC_DEFS_H
	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
	14	// 8 byte segment descriptor
	15	struct desc_struct {
	16	u16 limit0;
	17	u16 base0;
	18	unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;
	19	unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;
	20	} __attribute__((packed));
	21
	22	struct n_desc_struct {
	23	unsigned int a,b;
	24	};
	25
	26	enum {
	27	GATE_INTERRUPT = 0xE,
	28	GATE_TRAP = 0xF,
	29	GATE_CALL = 0xC,
	30	};
	31
	32	// 16byte gate
	33	struct gate_struct {
	34	u16 offset_low;
	35	u16 segment;
	36	unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
	37	u16 offset_middle;
	38	u32 offset_high;
	39	u32 zero1;
	40	} __attribute__((packed));
	41
	42	#define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF)
	43	#define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
	44	#define PTR_HIGH(x) ((unsigned long)(x) >> 32)
	45
	46	enum {
	47	DESC_TSS = 0x9,
	48	DESC_LDT = 0x2,
	49	};
	50
	51	// LDT or TSS descriptor in the GDT. 16 bytes.
	52	struct ldttss_desc {
	53	u16 limit0;
	54	u16 base0;
	55	unsigned base1 : 8, type : 5, dpl : 2, p : 1;
	56	unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
	57	u32 base3;
	58	u32 zero1;
	59	} __attribute__((packed));
	60
	61	struct desc_ptr {
	62	unsigned short size;
	63	unsigned long address;
	64	} __attribute__((packed)) ;
65
66
67	#endif /* !__ASSEMBLY__ */
68
69	#endif