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1 | /* Written 2000 by Andi Kleen */ |
1 | /* Written 2000 by Andi Kleen */ |
2 | #ifndef _ASM_X86_DESC_DEFS_H |
2 | #ifndef _ASM_X86_DESC_DEFS_H |
3 | #define _ASM_X86_DESC_DEFS_H |
3 | #define _ASM_X86_DESC_DEFS_H |
4 | 4 | ||
5 | /* |
5 | /* |
6 | * Segment descriptor structure definitions, usable from both x86_64 and i386 |
6 | * Segment descriptor structure definitions, usable from both x86_64 and i386 |
7 | * archs. |
7 | * archs. |
8 | */ |
8 | */ |
9 | 9 | ||
10 | #ifndef __ASSEMBLY__ |
10 | #ifndef __ASSEMBLY__ |
11 | 11 | ||
12 | #include |
12 | #include |
13 | 13 | ||
14 | /* |
14 | /* |
15 | * FIXME: Accessing the desc_struct through its fields is more elegant, |
15 | * FIXME: Accessing 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 |
16 | * and should be the one valid thing to do. However, a lot of open code |
17 | * still touches the a and b accessors, and doing this allow us to do it |
17 | * still touches the a and b accessors, and doing this allow us to do it |
18 | * incrementally. We keep the signature as a struct, rather than an union, |
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 |
19 | * so we can get rid of it transparently in the future -- glommer |
20 | */ |
20 | */ |
21 | /* 8 byte segment descriptor */ |
21 | /* 8 byte segment descriptor */ |
22 | struct desc_struct { |
22 | struct desc_struct { |
23 | union { |
23 | union { |
24 | struct { |
24 | struct { |
25 | unsigned int a; |
25 | unsigned int a; |
26 | unsigned int b; |
26 | unsigned int b; |
27 | }; |
27 | }; |
28 | struct { |
28 | struct { |
29 | u16 limit0; |
29 | u16 limit0; |
30 | u16 base0; |
30 | u16 base0; |
31 | unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1; |
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; |
32 | unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; |
33 | }; |
33 | }; |
34 | }; |
34 | }; |
35 | } __attribute__((packed)); |
35 | } __attribute__((packed)); |
36 | 36 | ||
37 | #define GDT_ENTRY_INIT(flags, base, limit) { { { \ |
37 | #define GDT_ENTRY_INIT(flags, base, limit) { { { \ |
38 | .a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \ |
38 | .a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \ |
39 | .b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \ |
39 | .b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \ |
40 | ((limit) & 0xf0000) | ((base) & 0xff000000), \ |
40 | ((limit) & 0xf0000) | ((base) & 0xff000000), \ |
41 | } } } |
41 | } } } |
42 | 42 | ||
43 | enum { |
43 | enum { |
44 | GATE_INTERRUPT = 0xE, |
44 | GATE_INTERRUPT = 0xE, |
45 | GATE_TRAP = 0xF, |
45 | GATE_TRAP = 0xF, |
46 | GATE_CALL = 0xC, |
46 | GATE_CALL = 0xC, |
47 | GATE_TASK = 0x5, |
47 | GATE_TASK = 0x5, |
48 | }; |
48 | }; |
49 | 49 | ||
50 | /* 16byte gate */ |
50 | /* 16byte gate */ |
51 | struct gate_struct64 { |
51 | struct gate_struct64 { |
52 | u16 offset_low; |
52 | u16 offset_low; |
53 | u16 segment; |
53 | u16 segment; |
54 | unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; |
54 | unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; |
55 | u16 offset_middle; |
55 | u16 offset_middle; |
56 | u32 offset_high; |
56 | u32 offset_high; |
57 | u32 zero1; |
57 | u32 zero1; |
58 | } __attribute__((packed)); |
58 | } __attribute__((packed)); |
59 | 59 | ||
60 | #define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) |
60 | #define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) |
61 | #define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) |
61 | #define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) |
62 | #define PTR_HIGH(x) ((unsigned long long)(x) >> 32) |
62 | #define PTR_HIGH(x) ((unsigned long long)(x) >> 32) |
63 | 63 | ||
64 | enum { |
64 | enum { |
65 | DESC_TSS = 0x9, |
65 | DESC_TSS = 0x9, |
66 | DESC_LDT = 0x2, |
66 | DESC_LDT = 0x2, |
67 | DESCTYPE_S = 0x10, /* !system */ |
67 | DESCTYPE_S = 0x10, /* !system */ |
68 | }; |
68 | }; |
69 | 69 | ||
70 | /* LDT or TSS descriptor in the GDT. 16 bytes. */ |
70 | /* LDT or TSS descriptor in the GDT. 16 bytes. */ |
71 | struct ldttss_desc64 { |
71 | struct ldttss_desc64 { |
72 | u16 limit0; |
72 | u16 limit0; |
73 | u16 base0; |
73 | u16 base0; |
74 | unsigned base1 : 8, type : 5, dpl : 2, p : 1; |
74 | unsigned base1 : 8, type : 5, dpl : 2, p : 1; |
75 | unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; |
75 | unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; |
76 | u32 base3; |
76 | u32 base3; |
77 | u32 zero1; |
77 | u32 zero1; |
78 | } __attribute__((packed)); |
78 | } __attribute__((packed)); |
79 | 79 | ||
80 | #ifdef CONFIG_X86_64 |
80 | #ifdef CONFIG_X86_64 |
81 | typedef struct gate_struct64 gate_desc; |
81 | typedef struct gate_struct64 gate_desc; |
82 | typedef struct ldttss_desc64 ldt_desc; |
82 | typedef struct ldttss_desc64 ldt_desc; |
83 | typedef struct ldttss_desc64 tss_desc; |
83 | typedef struct ldttss_desc64 tss_desc; |
84 | #define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32)) |
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) |
85 | #define gate_segment(g) ((g).segment) |
86 | #else |
86 | #else |
87 | typedef struct desc_struct gate_desc; |
87 | typedef struct desc_struct gate_desc; |
88 | typedef struct desc_struct ldt_desc; |
88 | typedef struct desc_struct ldt_desc; |
89 | typedef struct desc_struct tss_desc; |
89 | typedef struct desc_struct tss_desc; |
90 | #define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff)) |
90 | #define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff)) |
91 | #define gate_segment(g) ((g).a >> 16) |
91 | #define gate_segment(g) ((g).a >> 16) |
92 | #endif |
92 | #endif |
93 | 93 | ||
94 | struct desc_ptr { |
94 | struct desc_ptr { |
95 | unsigned short size; |
95 | unsigned short size; |
96 | unsigned long address; |
96 | unsigned long address; |
97 | } __attribute__((packed)) ; |
97 | } __attribute__((packed)) ; |
98 | 98 | ||
99 | #endif /* !__ASSEMBLY__ */ |
99 | #endif /* !__ASSEMBLY__ */ |
- | 100 | ||
- | 101 | /* Access rights as returned by LAR */ |
|
- | 102 | #define AR_TYPE_RODATA (0 * (1 << 9)) |
|
- | 103 | #define AR_TYPE_RWDATA (1 * (1 << 9)) |
|
- | 104 | #define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9)) |
|
- | 105 | #define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9)) |
|
- | 106 | #define AR_TYPE_XOCODE (4 * (1 << 9)) |
|
- | 107 | #define AR_TYPE_XRCODE (5 * (1 << 9)) |
|
- | 108 | #define AR_TYPE_XOCODE_CONF (6 * (1 << 9)) |
|
- | 109 | #define AR_TYPE_XRCODE_CONF (7 * (1 << 9)) |
|
- | 110 | #define AR_TYPE_MASK (7 * (1 << 9)) |
|
- | 111 | ||
- | 112 | #define AR_DPL0 (0 * (1 << 13)) |
|
- | 113 | #define AR_DPL3 (3 * (1 << 13)) |
|
- | 114 | #define AR_DPL_MASK (3 * (1 << 13)) |
|
- | 115 | ||
- | 116 | #define AR_A (1 << 8) /* "Accessed" */ |
|
- | 117 | #define AR_S (1 << 12) /* If clear, "System" segment */ |
|
- | 118 | #define AR_P (1 << 15) /* "Present" */ |
|
- | 119 | #define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */ |
|
- | 120 | #define AR_L (1 << 21) /* "Long mode" for code segments */ |
|
- | 121 | #define AR_DB (1 << 22) /* D/B, effect depends on type */ |
|
- | 122 | #define AR_G (1 << 23) /* "Granularity" (limit in pages) */ |
|
100 | 123 | ||
101 | #endif /* _ASM_X86_DESC_DEFS_H */><>><>><>><> |
124 | #endif /* _ASM_X86_DESC_DEFS_H */><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><>><> |