Commit | Line | Data |
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249e83fe | 1 | /* Written 2000 by Andi Kleen */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_DESC_DEFS_H |
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 |
6842ef0e GOC |
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 | */ | |
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 | }; |
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 | }; |
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 | }; |
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 |
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)) |
85 | #define gate_segment(g) ((g).segment) | |
010d4f82 GOC |
86 | #else |
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)) |
91 | #define gate_segment(g) ((g).a >> 16) | |
010d4f82 GOC |
92 | #endif |
93 | ||
249e83fe AK |
94 | struct desc_ptr { |
95 | unsigned short size; | |
96 | unsigned long address; | |
97 | } __attribute__((packed)) ; | |
98 | ||
249e83fe AK |
99 | #endif /* !__ASSEMBLY__ */ |
100 | ||
1965aae3 | 101 | #endif /* _ASM_X86_DESC_DEFS_H */ |