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Avi Kivity249e83f2006-12-07 02:14:04 +01001/* Written 2000 by Andi Kleen */
Vegard Nossum77ef50a2008-06-18 17:08:48 +02002#ifndef ASM_X86__DESC_DEFS_H
3#define ASM_X86__DESC_DEFS_H
Avi Kivity249e83f2006-12-07 02:14:04 +01004
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
Glauber de Oliveira Costa6842ef02008-01-30 13:31:11 +010014/*
15 * FIXME: Acessing the desc_struct through its fields is more elegant,
16 * and should be the one valid thing to do. However, a lot of open code
17 * still touches the a and b acessors, and doing this allow us to do it
18 * incrementally. We keep the signature as a struct, rather than an union,
19 * so we can get rid of it transparently in the future -- glommer
20 */
Joe Perchesb7761902008-03-23 01:01:57 -070021/* 8 byte segment descriptor */
Avi Kivity249e83f2006-12-07 02:14:04 +010022struct desc_struct {
Glauber de Oliveira Costa6842ef02008-01-30 13:31:11 +010023 union {
Joe Perchesb7761902008-03-23 01:01:57 -070024 struct {
25 unsigned int a;
26 unsigned int b;
27 };
Glauber de Oliveira Costa6842ef02008-01-30 13:31:11 +010028 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 };
Glauber de Oliveira Costa6842ef02008-01-30 13:31:11 +010034 };
35} __attribute__((packed));
Avi Kivity249e83f2006-12-07 02:14:04 +010036
37enum {
38 GATE_INTERRUPT = 0xE,
39 GATE_TRAP = 0xF,
40 GATE_CALL = 0xC,
Glauber de Oliveira Costa507f90c2008-01-30 13:31:14 +010041 GATE_TASK = 0x5,
Avi Kivity249e83f2006-12-07 02:14:04 +010042};
43
Joe Perchesb7761902008-03-23 01:01:57 -070044/* 16byte gate */
Glauber de Oliveira Costa010d4f82008-01-30 13:31:12 +010045struct gate_struct64 {
Avi Kivity249e83f2006-12-07 02:14:04 +010046 u16 offset_low;
47 u16 segment;
48 unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
49 u16 offset_middle;
50 u32 offset_high;
51 u32 zero1;
52} __attribute__((packed));
53
Glauber de Oliveira Costa54cd0ea2008-01-30 13:31:14 +010054#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF)
55#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
56#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)
Avi Kivity249e83f2006-12-07 02:14:04 +010057
58enum {
59 DESC_TSS = 0x9,
60 DESC_LDT = 0x2,
Joe Perchesb7761902008-03-23 01:01:57 -070061 DESCTYPE_S = 0x10, /* !system */
Avi Kivity249e83f2006-12-07 02:14:04 +010062};
63
Joe Perchesb7761902008-03-23 01:01:57 -070064/* LDT or TSS descriptor in the GDT. 16 bytes. */
Glauber de Oliveira Costa25deca52008-01-30 13:31:13 +010065struct ldttss_desc64 {
Avi Kivity249e83f2006-12-07 02:14:04 +010066 u16 limit0;
67 u16 base0;
68 unsigned base1 : 8, type : 5, dpl : 2, p : 1;
69 unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
70 u32 base3;
71 u32 zero1;
72} __attribute__((packed));
73
Glauber de Oliveira Costa010d4f82008-01-30 13:31:12 +010074#ifdef CONFIG_X86_64
75typedef struct gate_struct64 gate_desc;
Glauber de Oliveira Costa25deca52008-01-30 13:31:13 +010076typedef struct ldttss_desc64 ldt_desc;
Glauber de Oliveira Costa18245d52008-01-30 13:31:13 +010077typedef struct ldttss_desc64 tss_desc;
Jeremy Fitzhardinge43adfc22008-06-25 00:19:04 -040078#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
79#define gate_segment(g) ((g).segment)
Glauber de Oliveira Costa010d4f82008-01-30 13:31:12 +010080#else
81typedef struct desc_struct gate_desc;
Glauber de Oliveira Costa25deca52008-01-30 13:31:13 +010082typedef struct desc_struct ldt_desc;
Glauber de Oliveira Costa18245d52008-01-30 13:31:13 +010083typedef struct desc_struct tss_desc;
Jeremy Fitzhardinge43adfc22008-06-25 00:19:04 -040084#define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
85#define gate_segment(g) ((g).a >> 16)
Glauber de Oliveira Costa010d4f82008-01-30 13:31:12 +010086#endif
87
Avi Kivity249e83f2006-12-07 02:14:04 +010088struct desc_ptr {
89 unsigned short size;
90 unsigned long address;
91} __attribute__((packed)) ;
92
Avi Kivity249e83f2006-12-07 02:14:04 +010093#endif /* !__ASSEMBLY__ */
94
Vegard Nossum77ef50a2008-06-18 17:08:48 +020095#endif /* ASM_X86__DESC_DEFS_H */