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 | ||
6842ef0e GOC |
14 | /* |
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 | */ | |
249e83fe AK |
21 | // 8 byte segment descriptor |
22 | struct desc_struct { | |
6842ef0e GOC |
23 | union { |
24 | struct { unsigned int a, b; }; | |
25 | struct { | |
26 | u16 limit0; | |
27 | u16 base0; | |
28 | unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1; | |
29 | unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; | |
30 | }; | |
249e83fe | 31 | |
6842ef0e GOC |
32 | }; |
33 | } __attribute__((packed)); | |
249e83fe AK |
34 | |
35 | enum { | |
36 | GATE_INTERRUPT = 0xE, | |
37 | GATE_TRAP = 0xF, | |
38 | GATE_CALL = 0xC, | |
507f90c9 | 39 | GATE_TASK = 0x5, |
249e83fe AK |
40 | }; |
41 | ||
42 | // 16byte gate | |
010d4f82 | 43 | struct gate_struct64 { |
249e83fe AK |
44 | u16 offset_low; |
45 | u16 segment; | |
46 | unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; | |
47 | u16 offset_middle; | |
48 | u32 offset_high; | |
49 | u32 zero1; | |
50 | } __attribute__((packed)); | |
51 | ||
54cd0eac GOC |
52 | #define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) |
53 | #define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) | |
54 | #define PTR_HIGH(x) ((unsigned long long)(x) >> 32) | |
249e83fe AK |
55 | |
56 | enum { | |
57 | DESC_TSS = 0x9, | |
58 | DESC_LDT = 0x2, | |
59fbed77 | 59 | DESCTYPE_S = 0x10, /* !system */ |
249e83fe AK |
60 | }; |
61 | ||
62 | // LDT or TSS descriptor in the GDT. 16 bytes. | |
25deca53 | 63 | struct ldttss_desc64 { |
249e83fe AK |
64 | u16 limit0; |
65 | u16 base0; | |
66 | unsigned base1 : 8, type : 5, dpl : 2, p : 1; | |
67 | unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; | |
68 | u32 base3; | |
69 | u32 zero1; | |
70 | } __attribute__((packed)); | |
71 | ||
010d4f82 GOC |
72 | #ifdef CONFIG_X86_64 |
73 | typedef struct gate_struct64 gate_desc; | |
25deca53 | 74 | typedef struct ldttss_desc64 ldt_desc; |
18245d5b | 75 | typedef struct ldttss_desc64 tss_desc; |
010d4f82 GOC |
76 | #else |
77 | typedef struct desc_struct gate_desc; | |
25deca53 | 78 | typedef struct desc_struct ldt_desc; |
18245d5b | 79 | typedef struct desc_struct tss_desc; |
010d4f82 GOC |
80 | #endif |
81 | ||
249e83fe AK |
82 | struct desc_ptr { |
83 | unsigned short size; | |
84 | unsigned long address; | |
85 | } __attribute__((packed)) ; | |
86 | ||
87 | ||
88 | #endif /* !__ASSEMBLY__ */ | |
89 | ||
90 | #endif |