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1 | #ifndef _ASM_X86_SEGMENT_H_ |
2 | #define _ASM_X86_SEGMENT_H_ | |
3 | ||
2a6648e6 PA |
4 | /* Simple and small GDT entries for booting only */ |
5 | ||
6 | #define GDT_ENTRY_BOOT_CS 2 | |
7 | #define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) | |
8 | ||
9 | #define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) | |
10 | #define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) | |
11 | ||
96a388de | 12 | #ifdef CONFIG_X86_32 |
b23be399 GOC |
13 | /* |
14 | * The layout of the per-CPU GDT under Linux: | |
15 | * | |
16 | * 0 - null | |
17 | * 1 - reserved | |
18 | * 2 - reserved | |
19 | * 3 - reserved | |
20 | * | |
21 | * 4 - unused <==== new cacheline | |
22 | * 5 - unused | |
23 | * | |
24 | * ------- start of TLS (Thread-Local Storage) segments: | |
25 | * | |
26 | * 6 - TLS segment #1 [ glibc's TLS segment ] | |
27 | * 7 - TLS segment #2 [ Wine's %fs Win32 segment ] | |
28 | * 8 - TLS segment #3 | |
29 | * 9 - reserved | |
30 | * 10 - reserved | |
31 | * 11 - reserved | |
32 | * | |
33 | * ------- start of kernel segments: | |
34 | * | |
35 | * 12 - kernel code segment <==== new cacheline | |
36 | * 13 - kernel data segment | |
37 | * 14 - default user CS | |
38 | * 15 - default user DS | |
39 | * 16 - TSS | |
40 | * 17 - LDT | |
41 | * 18 - PNPBIOS support (16->32 gate) | |
42 | * 19 - PNPBIOS support | |
43 | * 20 - PNPBIOS support | |
44 | * 21 - PNPBIOS support | |
45 | * 22 - PNPBIOS support | |
46 | * 23 - APM BIOS support | |
47 | * 24 - APM BIOS support | |
48 | * 25 - APM BIOS support | |
49 | * | |
50 | * 26 - ESPFIX small SS | |
51 | * 27 - per-cpu [ offset to per-cpu data area ] | |
52 | * 28 - unused | |
53 | * 29 - unused | |
54 | * 30 - unused | |
55 | * 31 - TSS for double fault handler | |
56 | */ | |
57 | #define GDT_ENTRY_TLS_MIN 6 | |
58 | #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1) | |
59 | ||
60 | #define GDT_ENTRY_DEFAULT_USER_CS 14 | |
61 | #define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3) | |
62 | ||
63 | #define GDT_ENTRY_DEFAULT_USER_DS 15 | |
64 | #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3) | |
65 | ||
66 | #define GDT_ENTRY_KERNEL_BASE 12 | |
67 | ||
68 | #define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0) | |
69 | #define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8) | |
70 | ||
71 | #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1) | |
72 | #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8) | |
73 | ||
74 | #define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4) | |
75 | #define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5) | |
76 | ||
77 | #define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6) | |
78 | #define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11) | |
79 | ||
80 | #define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE + 14) | |
81 | #define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8) | |
82 | ||
83 | #define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE + 15) | |
84 | #ifdef CONFIG_SMP | |
85 | #define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8) | |
86 | #else | |
87 | #define __KERNEL_PERCPU 0 | |
88 | #endif | |
89 | ||
90 | #define GDT_ENTRY_DOUBLEFAULT_TSS 31 | |
91 | ||
92 | /* | |
93 | * The GDT has 32 entries | |
94 | */ | |
95 | #define GDT_ENTRIES 32 | |
96 | ||
b23be399 GOC |
97 | /* The PnP BIOS entries in the GDT */ |
98 | #define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0) | |
99 | #define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1) | |
100 | #define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2) | |
101 | #define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3) | |
102 | #define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4) | |
103 | ||
104 | /* The PnP BIOS selectors */ | |
105 | #define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */ | |
106 | #define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */ | |
107 | #define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */ | |
108 | #define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */ | |
109 | #define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */ | |
110 | ||
111 | /* Bottom two bits of selector give the ring privilege level */ | |
112 | #define SEGMENT_RPL_MASK 0x3 | |
113 | /* Bit 2 is table indicator (LDT/GDT) */ | |
114 | #define SEGMENT_TI_MASK 0x4 | |
115 | ||
116 | /* User mode is privilege level 3 */ | |
117 | #define USER_RPL 0x3 | |
118 | /* LDT segment has TI set, GDT has it cleared */ | |
119 | #define SEGMENT_LDT 0x4 | |
120 | #define SEGMENT_GDT 0x0 | |
121 | ||
122 | /* | |
123 | * Matching rules for certain types of segments. | |
124 | */ | |
125 | ||
126 | /* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */ | |
127 | #define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8) | |
128 | ||
129 | /* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */ | |
130 | #define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8) | |
131 | ||
132 | /* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */ | |
133 | #define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8) | |
134 | ||
135 | ||
96a388de | 136 | #else |
b23be399 GOC |
137 | #include <asm/cache.h> |
138 | ||
b23be399 GOC |
139 | #define __KERNEL_CS 0x10 |
140 | #define __KERNEL_DS 0x18 | |
141 | ||
142 | #define __KERNEL32_CS 0x08 | |
143 | ||
144 | /* | |
145 | * we cannot use the same code segment descriptor for user and kernel | |
146 | * -- not even in the long flat mode, because of different DPL /kkeil | |
147 | * The segment offset needs to contain a RPL. Grr. -AK | |
148 | * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets) | |
149 | */ | |
150 | ||
151 | #define __USER32_CS 0x23 /* 4*8+3 */ | |
152 | #define __USER_DS 0x2b /* 5*8+3 */ | |
153 | #define __USER_CS 0x33 /* 6*8+3 */ | |
154 | #define __USER32_DS __USER_DS | |
155 | ||
156 | #define GDT_ENTRY_TSS 8 /* needs two entries */ | |
157 | #define GDT_ENTRY_LDT 10 /* needs two entries */ | |
158 | #define GDT_ENTRY_TLS_MIN 12 | |
159 | #define GDT_ENTRY_TLS_MAX 14 | |
160 | ||
161 | #define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */ | |
162 | #define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3) | |
163 | ||
164 | /* TLS indexes for 64bit - hardcoded in arch_prctl */ | |
165 | #define FS_TLS 0 | |
166 | #define GS_TLS 1 | |
167 | ||
168 | #define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3) | |
169 | #define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3) | |
170 | ||
171 | #define GDT_ENTRIES 16 | |
172 | ||
96a388de | 173 | #endif |
cef18950 GOC |
174 | |
175 | #ifndef CONFIG_PARAVIRT | |
176 | #define get_kernel_rpl() 0 | |
177 | #endif | |
178 | ||
15ee09b4 GOC |
179 | /* User mode is privilege level 3 */ |
180 | #define USER_RPL 0x3 | |
181 | /* LDT segment has TI set, GDT has it cleared */ | |
182 | #define SEGMENT_LDT 0x4 | |
183 | #define SEGMENT_GDT 0x0 | |
184 | ||
185 | /* Bottom two bits of selector give the ring privilege level */ | |
186 | #define SEGMENT_RPL_MASK 0x3 | |
187 | /* Bit 2 is table indicator (LDT/GDT) */ | |
188 | #define SEGMENT_TI_MASK 0x4 | |
189 | ||
190 | #define IDT_ENTRIES 256 | |
191 | #define GDT_SIZE (GDT_ENTRIES * 8) | |
192 | #define GDT_ENTRY_TLS_ENTRIES 3 | |
193 | #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) | |
194 | ||
cef18950 | 195 | #endif |