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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
249e83fe | 2 | /* Written 2000 by Andi Kleen */ |
1965aae3 PA |
3 | #ifndef _ASM_X86_DESC_DEFS_H |
4 | #define _ASM_X86_DESC_DEFS_H | |
249e83fe AK |
5 | |
6 | /* | |
7 | * Segment descriptor structure definitions, usable from both x86_64 and i386 | |
8 | * archs. | |
9 | */ | |
10 | ||
016919c1 VN |
11 | /* |
12 | * Low-level interface mapping flags/field names to bits | |
13 | */ | |
14 | ||
15 | /* Flags for _DESC_S (non-system) descriptors */ | |
16 | #define _DESC_ACCESSED 0x0001 | |
17 | #define _DESC_DATA_WRITABLE 0x0002 | |
18 | #define _DESC_CODE_READABLE 0x0002 | |
19 | #define _DESC_DATA_EXPAND_DOWN 0x0004 | |
20 | #define _DESC_CODE_CONFORMING 0x0004 | |
21 | #define _DESC_CODE_EXECUTABLE 0x0008 | |
22 | ||
23 | /* Common flags */ | |
24 | #define _DESC_S 0x0010 | |
25 | #define _DESC_DPL(dpl) ((dpl) << 5) | |
26 | #define _DESC_PRESENT 0x0080 | |
27 | ||
28 | #define _DESC_LONG_CODE 0x2000 | |
29 | #define _DESC_DB 0x4000 | |
30 | #define _DESC_GRANULARITY_4K 0x8000 | |
31 | ||
32 | /* System descriptors have a numeric "type" field instead of flags */ | |
33 | #define _DESC_SYSTEM(code) (code) | |
34 | ||
35 | /* | |
36 | * High-level interface mapping intended usage to low-level combinations | |
37 | * of flags | |
38 | */ | |
39 | ||
3b184b71 | 40 | #define _DESC_DATA (_DESC_S | _DESC_PRESENT | _DESC_ACCESSED | \ |
016919c1 | 41 | _DESC_DATA_WRITABLE) |
3b184b71 | 42 | #define _DESC_CODE (_DESC_S | _DESC_PRESENT | _DESC_ACCESSED | \ |
016919c1 VN |
43 | _DESC_CODE_READABLE | _DESC_CODE_EXECUTABLE) |
44 | ||
45 | #define DESC_DATA16 (_DESC_DATA) | |
46 | #define DESC_CODE16 (_DESC_CODE) | |
47 | ||
48 | #define DESC_DATA32 (_DESC_DATA | _DESC_GRANULARITY_4K | _DESC_DB) | |
49 | #define DESC_DATA32_BIOS (_DESC_DATA | _DESC_DB) | |
50 | ||
51 | #define DESC_CODE32 (_DESC_CODE | _DESC_GRANULARITY_4K | _DESC_DB) | |
52 | #define DESC_CODE32_BIOS (_DESC_CODE | _DESC_DB) | |
53 | ||
54 | #define DESC_TSS32 (_DESC_SYSTEM(9) | _DESC_PRESENT) | |
55 | ||
56 | #define DESC_DATA64 (_DESC_DATA | _DESC_GRANULARITY_4K | _DESC_DB) | |
57 | #define DESC_CODE64 (_DESC_CODE | _DESC_GRANULARITY_4K | _DESC_LONG_CODE) | |
58 | ||
59 | #define DESC_USER (_DESC_DPL(3)) | |
60 | ||
249e83fe AK |
61 | #ifndef __ASSEMBLY__ |
62 | ||
63 | #include <linux/types.h> | |
64 | ||
b7761900 | 65 | /* 8 byte segment descriptor */ |
249e83fe | 66 | struct desc_struct { |
38e9e81f TG |
67 | u16 limit0; |
68 | u16 base0; | |
69 | u16 base1: 8, type: 4, s: 1, dpl: 2, p: 1; | |
70 | u16 limit1: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; | |
6842ef0e | 71 | } __attribute__((packed)); |
249e83fe | 72 | |
38e9e81f TG |
73 | #define GDT_ENTRY_INIT(flags, base, limit) \ |
74 | { \ | |
016919c1 VN |
75 | .limit0 = ((limit) >> 0) & 0xFFFF, \ |
76 | .limit1 = ((limit) >> 16) & 0x000F, \ | |
77 | .base0 = ((base) >> 0) & 0xFFFF, \ | |
78 | .base1 = ((base) >> 16) & 0x00FF, \ | |
79 | .base2 = ((base) >> 24) & 0x00FF, \ | |
80 | .type = ((flags) >> 0) & 0x000F, \ | |
81 | .s = ((flags) >> 4) & 0x0001, \ | |
82 | .dpl = ((flags) >> 5) & 0x0003, \ | |
83 | .p = ((flags) >> 7) & 0x0001, \ | |
84 | .avl = ((flags) >> 12) & 0x0001, \ | |
85 | .l = ((flags) >> 13) & 0x0001, \ | |
86 | .d = ((flags) >> 14) & 0x0001, \ | |
87 | .g = ((flags) >> 15) & 0x0001, \ | |
38e9e81f | 88 | } |
1e5de182 | 89 | |
249e83fe AK |
90 | enum { |
91 | GATE_INTERRUPT = 0xE, | |
92 | GATE_TRAP = 0xF, | |
93 | GATE_CALL = 0xC, | |
507f90c9 | 94 | GATE_TASK = 0x5, |
249e83fe AK |
95 | }; |
96 | ||
249e83fe AK |
97 | enum { |
98 | DESC_TSS = 0x9, | |
99 | DESC_LDT = 0x2, | |
b7761900 | 100 | DESCTYPE_S = 0x10, /* !system */ |
249e83fe AK |
101 | }; |
102 | ||
87cc0376 TG |
103 | /* LDT or TSS descriptor in the GDT. */ |
104 | struct ldttss_desc { | |
105 | u16 limit0; | |
106 | u16 base0; | |
64b163fa | 107 | |
87cc0376 TG |
108 | u16 base1 : 8, type : 5, dpl : 2, p : 1; |
109 | u16 limit1 : 4, zero0 : 3, g : 1, base2 : 8; | |
010d4f82 | 110 | #ifdef CONFIG_X86_64 |
87cc0376 TG |
111 | u32 base3; |
112 | u32 zero1; | |
010d4f82 | 113 | #endif |
87cc0376 TG |
114 | } __attribute__((packed)); |
115 | ||
116 | typedef struct ldttss_desc ldt_desc; | |
117 | typedef struct ldttss_desc tss_desc; | |
010d4f82 | 118 | |
64b163fa TG |
119 | struct idt_bits { |
120 | u16 ist : 3, | |
121 | zero : 5, | |
122 | type : 5, | |
123 | dpl : 2, | |
124 | p : 1; | |
125 | } __attribute__((packed)); | |
126 | ||
097ee5b7 JR |
127 | struct idt_data { |
128 | unsigned int vector; | |
129 | unsigned int segment; | |
130 | struct idt_bits bits; | |
131 | const void *addr; | |
132 | }; | |
133 | ||
64b163fa TG |
134 | struct gate_struct { |
135 | u16 offset_low; | |
136 | u16 segment; | |
137 | struct idt_bits bits; | |
138 | u16 offset_middle; | |
139 | #ifdef CONFIG_X86_64 | |
140 | u32 offset_high; | |
141 | u32 reserved; | |
142 | #endif | |
143 | } __attribute__((packed)); | |
144 | ||
145 | typedef struct gate_struct gate_desc; | |
146 | ||
41ef75c8 | 147 | #ifndef _SETUP |
64b163fa TG |
148 | static inline unsigned long gate_offset(const gate_desc *g) |
149 | { | |
150 | #ifdef CONFIG_X86_64 | |
151 | return g->offset_low | ((unsigned long)g->offset_middle << 16) | | |
152 | ((unsigned long) g->offset_high << 32); | |
153 | #else | |
154 | return g->offset_low | ((unsigned long)g->offset_middle << 16); | |
155 | #endif | |
156 | } | |
157 | ||
158 | static inline unsigned long gate_segment(const gate_desc *g) | |
159 | { | |
160 | return g->segment; | |
161 | } | |
41ef75c8 | 162 | #endif |
64b163fa | 163 | |
249e83fe AK |
164 | struct desc_ptr { |
165 | unsigned short size; | |
166 | unsigned long address; | |
167 | } __attribute__((packed)) ; | |
168 | ||
249e83fe AK |
169 | #endif /* !__ASSEMBLY__ */ |
170 | ||
64e68263 JR |
171 | /* Boot IDT definitions */ |
172 | #define BOOT_IDT_ENTRIES 32 | |
173 | ||
8ff5bd2e AL |
174 | /* Access rights as returned by LAR */ |
175 | #define AR_TYPE_RODATA (0 * (1 << 9)) | |
176 | #define AR_TYPE_RWDATA (1 * (1 << 9)) | |
177 | #define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9)) | |
178 | #define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9)) | |
179 | #define AR_TYPE_XOCODE (4 * (1 << 9)) | |
180 | #define AR_TYPE_XRCODE (5 * (1 << 9)) | |
181 | #define AR_TYPE_XOCODE_CONF (6 * (1 << 9)) | |
182 | #define AR_TYPE_XRCODE_CONF (7 * (1 << 9)) | |
183 | #define AR_TYPE_MASK (7 * (1 << 9)) | |
184 | ||
185 | #define AR_DPL0 (0 * (1 << 13)) | |
186 | #define AR_DPL3 (3 * (1 << 13)) | |
187 | #define AR_DPL_MASK (3 * (1 << 13)) | |
188 | ||
189 | #define AR_A (1 << 8) /* "Accessed" */ | |
190 | #define AR_S (1 << 12) /* If clear, "System" segment */ | |
191 | #define AR_P (1 << 15) /* "Present" */ | |
192 | #define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */ | |
193 | #define AR_L (1 << 21) /* "Long mode" for code segments */ | |
194 | #define AR_DB (1 << 22) /* D/B, effect depends on type */ | |
195 | #define AR_G (1 << 23) /* "Granularity" (limit in pages) */ | |
196 | ||
1965aae3 | 197 | #endif /* _ASM_X86_DESC_DEFS_H */ |