92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/* 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>
|
|
|
|
/*
|
|
* FIXME: Acessing 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 acessors, and doing this allow us to do it
|
|
* incrementally. We keep the signature as a struct, rather than an 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));
|
|
|
|
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;
|
|
#else
|
|
typedef struct desc_struct gate_desc;
|
|
typedef struct desc_struct ldt_desc;
|
|
typedef struct desc_struct tss_desc;
|
|
#endif
|
|
|
|
struct desc_ptr {
|
|
unsigned short size;
|
|
unsigned long address;
|
|
} __attribute__((packed)) ;
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif
|