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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5270 | serge | 1 | #ifndef _ASM_X86_SEGMENT_H |
| 2 | #define _ASM_X86_SEGMENT_H |
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| 3 | |||
| 4 | #include |
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| 5 | |||
| 6 | /* Constructor for a conventional segment GDT (or LDT) entry */ |
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| 7 | /* This is a macro so it can be used in initializers */ |
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| 8 | #define GDT_ENTRY(flags, base, limit) \ |
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| 9 | ((((base) & _AC(0xff000000,ULL)) << (56-24)) | \ |
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| 10 | (((flags) & _AC(0x0000f0ff,ULL)) << 40) | \ |
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| 11 | (((limit) & _AC(0x000f0000,ULL)) << (48-16)) | \ |
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| 12 | (((base) & _AC(0x00ffffff,ULL)) << 16) | \ |
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| 13 | (((limit) & _AC(0x0000ffff,ULL)))) |
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| 14 | |||
| 15 | /* Simple and small GDT entries for booting only */ |
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| 16 | |||
| 17 | #define GDT_ENTRY_BOOT_CS 2 |
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| 18 | #define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) |
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| 19 | |||
| 20 | #define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) |
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| 21 | #define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) |
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| 22 | |||
| 23 | #define GDT_ENTRY_BOOT_TSS (GDT_ENTRY_BOOT_CS + 2) |
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| 24 | #define __BOOT_TSS (GDT_ENTRY_BOOT_TSS * 8) |
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| 25 | |||
| 26 | #define SEGMENT_RPL_MASK 0x3 /* |
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| 27 | * Bottom two bits of selector give the ring |
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| 28 | * privilege level |
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| 29 | */ |
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| 30 | #define SEGMENT_TI_MASK 0x4 /* Bit 2 is table indicator (LDT/GDT) */ |
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| 31 | #define USER_RPL 0x3 /* User mode is privilege level 3 */ |
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| 32 | #define SEGMENT_LDT 0x4 /* LDT segment has TI set... */ |
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| 33 | #define SEGMENT_GDT 0x0 /* ... GDT has it cleared */ |
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| 34 | |||
| 35 | #ifdef CONFIG_X86_32 |
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| 36 | /* |
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| 37 | * The layout of the per-CPU GDT under Linux: |
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| 38 | * |
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| 39 | * 0 - null |
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| 40 | * 1 - reserved |
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| 41 | * 2 - reserved |
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| 42 | * 3 - reserved |
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| 43 | * |
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| 44 | * 4 - unused <==== new cacheline |
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| 45 | * 5 - unused |
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| 46 | * |
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| 47 | * ------- start of TLS (Thread-Local Storage) segments: |
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| 48 | * |
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| 49 | * 6 - TLS segment #1 [ glibc's TLS segment ] |
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| 50 | * 7 - TLS segment #2 [ Wine's %fs Win32 segment ] |
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| 51 | * 8 - TLS segment #3 |
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| 52 | * 9 - reserved |
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| 53 | * 10 - reserved |
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| 54 | * 11 - reserved |
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| 55 | * |
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| 56 | * ------- start of kernel segments: |
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| 57 | * |
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| 58 | * 12 - kernel code segment <==== new cacheline |
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| 59 | * 13 - kernel data segment |
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| 60 | * 14 - default user CS |
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| 61 | * 15 - default user DS |
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| 62 | * 16 - TSS |
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| 63 | * 17 - LDT |
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| 64 | * 18 - PNPBIOS support (16->32 gate) |
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| 65 | * 19 - PNPBIOS support |
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| 66 | * 20 - PNPBIOS support |
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| 67 | * 21 - PNPBIOS support |
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| 68 | * 22 - PNPBIOS support |
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| 69 | * 23 - APM BIOS support |
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| 70 | * 24 - APM BIOS support |
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| 71 | * 25 - APM BIOS support |
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| 72 | * |
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| 73 | * 26 - ESPFIX small SS |
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| 74 | * 27 - per-cpu [ offset to per-cpu data area ] |
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| 75 | * 28 - stack_canary-20 [ for stack protector ] |
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| 76 | * 29 - unused |
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| 77 | * 30 - unused |
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| 78 | * 31 - TSS for double fault handler |
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| 79 | */ |
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| 80 | #define GDT_ENTRY_TLS_MIN 6 |
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| 81 | #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1) |
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| 82 | |||
| 83 | #define GDT_ENTRY_DEFAULT_USER_CS 14 |
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| 84 | |||
| 85 | #define GDT_ENTRY_DEFAULT_USER_DS 15 |
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| 86 | |||
| 87 | #define GDT_ENTRY_KERNEL_BASE (12) |
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| 88 | |||
| 89 | #define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE+0) |
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| 90 | |||
| 91 | #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE+1) |
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| 92 | |||
| 93 | #define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE+4) |
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| 94 | #define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE+5) |
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| 95 | |||
| 96 | #define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE+6) |
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| 97 | #define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE+11) |
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| 98 | |||
| 99 | #define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE+14) |
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| 100 | #define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS*8) |
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| 101 | |||
| 102 | #define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE+15) |
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| 103 | #ifdef CONFIG_SMP |
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| 104 | #define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8) |
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| 105 | #else |
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| 106 | #define __KERNEL_PERCPU 0 |
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| 107 | #endif |
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| 108 | |||
| 109 | #define GDT_ENTRY_STACK_CANARY (GDT_ENTRY_KERNEL_BASE+16) |
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| 110 | #ifdef CONFIG_CC_STACKPROTECTOR |
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| 111 | #define __KERNEL_STACK_CANARY (GDT_ENTRY_STACK_CANARY*8) |
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| 112 | #else |
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| 113 | #define __KERNEL_STACK_CANARY 0 |
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| 114 | #endif |
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| 115 | |||
| 116 | #define GDT_ENTRY_DOUBLEFAULT_TSS 31 |
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| 117 | |||
| 118 | /* |
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| 119 | * The GDT has 32 entries |
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| 120 | */ |
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| 121 | #define GDT_ENTRIES 32 |
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| 122 | |||
| 123 | /* The PnP BIOS entries in the GDT */ |
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| 124 | #define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0) |
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| 125 | #define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1) |
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| 126 | #define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2) |
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| 127 | #define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3) |
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| 128 | #define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4) |
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| 129 | |||
| 130 | /* The PnP BIOS selectors */ |
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| 131 | #define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */ |
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| 132 | #define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */ |
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| 133 | #define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */ |
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| 134 | #define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */ |
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| 135 | #define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */ |
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| 136 | |||
| 137 | |||
| 138 | /* |
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| 139 | * Matching rules for certain types of segments. |
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| 140 | */ |
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| 141 | |||
| 142 | /* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */ |
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| 143 | #define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8) |
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| 144 | |||
| 145 | |||
| 146 | #else |
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| 147 | #include |
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| 148 | |||
| 149 | #define GDT_ENTRY_KERNEL32_CS 1 |
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| 150 | #define GDT_ENTRY_KERNEL_CS 2 |
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| 151 | #define GDT_ENTRY_KERNEL_DS 3 |
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| 152 | |||
| 153 | #define __KERNEL32_CS (GDT_ENTRY_KERNEL32_CS * 8) |
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| 154 | |||
| 155 | /* |
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| 156 | * we cannot use the same code segment descriptor for user and kernel |
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| 157 | * -- not even in the long flat mode, because of different DPL /kkeil |
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| 158 | * The segment offset needs to contain a RPL. Grr. -AK |
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| 159 | * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets) |
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| 160 | */ |
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| 161 | #define GDT_ENTRY_DEFAULT_USER32_CS 4 |
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| 162 | #define GDT_ENTRY_DEFAULT_USER_DS 5 |
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| 163 | #define GDT_ENTRY_DEFAULT_USER_CS 6 |
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| 164 | #define __USER32_CS (GDT_ENTRY_DEFAULT_USER32_CS*8+3) |
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| 165 | #define __USER32_DS __USER_DS |
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| 166 | |||
| 167 | #define GDT_ENTRY_TSS 8 /* needs two entries */ |
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| 168 | #define GDT_ENTRY_LDT 10 /* needs two entries */ |
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| 169 | #define GDT_ENTRY_TLS_MIN 12 |
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| 170 | #define GDT_ENTRY_TLS_MAX 14 |
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| 171 | |||
| 172 | #define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */ |
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| 173 | #define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3) |
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| 174 | |||
| 175 | /* TLS indexes for 64bit - hardcoded in arch_prctl */ |
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| 176 | #define FS_TLS 0 |
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| 177 | #define GS_TLS 1 |
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| 178 | |||
| 179 | #define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3) |
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| 180 | #define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3) |
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| 181 | |||
| 182 | #define GDT_ENTRIES 16 |
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| 183 | |||
| 184 | #endif |
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| 185 | |||
| 186 | #define __KERNEL_CS (GDT_ENTRY_KERNEL_CS*8) |
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| 187 | #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS*8) |
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| 188 | #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS*8+3) |
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| 189 | #define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS*8+3) |
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| 190 | #ifndef CONFIG_PARAVIRT |
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| 191 | #define get_kernel_rpl() 0 |
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| 192 | #endif |
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| 193 | |||
| 194 | #define IDT_ENTRIES 256 |
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| 195 | #define NUM_EXCEPTION_VECTORS 32 |
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| 196 | /* Bitmask of exception vectors which push an error code on the stack */ |
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| 197 | #define EXCEPTION_ERRCODE_MASK 0x00027d00 |
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| 198 | #define GDT_SIZE (GDT_ENTRIES * 8) |
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| 199 | #define GDT_ENTRY_TLS_ENTRIES 3 |
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| 200 | #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) |
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| 201 | |||
| 202 | #ifdef __KERNEL__ |
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| 203 | #ifndef __ASSEMBLY__ |
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| 204 | extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][2+2+5]; |
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| 205 | #ifdef CONFIG_TRACING |
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| 206 | #define trace_early_idt_handlers early_idt_handlers |
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| 207 | #endif |
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| 208 | |||
| 209 | /* |
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| 210 | * Load a segment. Fall back on loading the zero |
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| 211 | * segment if something goes wrong.. |
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| 212 | */ |
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| 213 | #define loadsegment(seg, value) \ |
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| 214 | do { \ |
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| 215 | unsigned short __val = (value); \ |
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| 216 | \ |
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| 217 | asm volatile(" \n" \ |
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| 218 | "1: movl %k0,%%" #seg " \n" \ |
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| 219 | \ |
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| 220 | ".section .fixup,\"ax\" \n" \ |
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| 221 | "2: xorl %k0,%k0 \n" \ |
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| 222 | " jmp 1b \n" \ |
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| 223 | ".previous \n" \ |
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| 224 | \ |
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| 225 | _ASM_EXTABLE(1b, 2b) \ |
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| 226 | \ |
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| 227 | : "+r" (__val) : : "memory"); \ |
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| 228 | } while (0) |
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| 229 | |||
| 230 | /* |
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| 231 | * Save a segment register away |
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| 232 | */ |
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| 233 | #define savesegment(seg, value) \ |
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| 234 | asm("mov %%" #seg ",%0":"=r" (value) : : "memory") |
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| 235 | |||
| 236 | /* |
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| 237 | * x86_32 user gs accessors. |
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| 238 | */ |
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| 239 | #ifdef CONFIG_X86_32 |
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| 240 | #ifdef CONFIG_X86_32_LAZY_GS |
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| 241 | #define get_user_gs(regs) (u16)({unsigned long v; savesegment(gs, v); v;}) |
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| 242 | #define set_user_gs(regs, v) loadsegment(gs, (unsigned long)(v)) |
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| 243 | #define task_user_gs(tsk) ((tsk)->thread.gs) |
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| 244 | #define lazy_save_gs(v) savesegment(gs, (v)) |
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| 245 | #define lazy_load_gs(v) loadsegment(gs, (v)) |
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| 246 | #else /* X86_32_LAZY_GS */ |
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| 247 | #define get_user_gs(regs) (u16)((regs)->gs) |
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| 248 | #define set_user_gs(regs, v) do { (regs)->gs = (v); } while (0) |
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| 249 | #define task_user_gs(tsk) (task_pt_regs(tsk)->gs) |
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| 250 | #define lazy_save_gs(v) do { } while (0) |
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| 251 | #define lazy_load_gs(v) do { } while (0) |
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| 252 | #endif /* X86_32_LAZY_GS */ |
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| 253 | #endif /* X86_32 */ |
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| 254 | |||
| 255 | static inline unsigned long get_limit(unsigned long segment) |
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| 256 | { |
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| 257 | unsigned long __limit; |
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| 258 | asm("lsll %1,%0" : "=r" (__limit) : "r" (segment)); |
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| 259 | return __limit + 1; |
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| 260 | } |
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| 261 | |||
| 262 | #endif /* !__ASSEMBLY__ */ |
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| 263 | #endif /* __KERNEL__ */ |
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| 264 | |||
| 265 | #endif /* _ASM_X86_SEGMENT_H */ |