projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _ASM_SEGMENT_H |
| 2 | #define _ASM_SEGMENT_H | |
| 3 | ||
| 4 | /* | |
| 5 | * The layout of the per-CPU GDT under Linux: | |
| 6 | * | |
| 7 | * 0 - null | |
| 8 | * 1 - reserved | |
| 9 | * 2 - reserved | |
| 10 | * 3 - reserved | |
| 11 | * | |
| 12 | * 4 - unused <==== new cacheline | |
| 13 | * 5 - unused | |
| 14 | * | |
| 15 | * ------- start of TLS (Thread-Local Storage) segments: | |
| 16 | * | |
| 17 | * 6 - TLS segment #1 [ glibc's TLS segment ] | |
| 18 | * 7 - TLS segment #2 [ Wine's %fs Win32 segment ] | |
| 19 | * 8 - TLS segment #3 | |
| 20 | * 9 - reserved | |
| 21 | * 10 - reserved | |
| 22 | * 11 - reserved | |
| 23 | * | |
| 24 | * ------- start of kernel segments: | |
| 25 | * | |
| 26 | * 12 - kernel code segment <==== new cacheline | |
| 27 | * 13 - kernel data segment | |
| 28 | * 14 - default user CS | |
| 29 | * 15 - default user DS | |
| 30 | * 16 - TSS | |
| 31 | * 17 - LDT | |
| 32 | * 18 - PNPBIOS support (16->32 gate) | |
| 33 | * 19 - PNPBIOS support | |
| 34 | * 20 - PNPBIOS support | |
| 35 | * 21 - PNPBIOS support | |
| 36 | * 22 - PNPBIOS support | |
| 37 | * 23 - APM BIOS support | |
| 38 | * 24 - APM BIOS support | |
| 39 | * 25 - APM BIOS support | |
| 40 | * | |
| 41 | * 26 - ESPFIX small SS | |
| 7c3576d2 | 42 | * 27 - per-cpu [ offset to per-cpu data area ] |
| 1da177e4 LT |
43 | * 28 - unused |
| 44 | * 29 - unused | |
| 45 | * 30 - unused | |
| 46 | * 31 - TSS for double fault handler | |
| 47 | */ | |
| 48 | #define GDT_ENTRY_TLS_ENTRIES 3 | |
| 49 | #define GDT_ENTRY_TLS_MIN 6 | |
| 50 | #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1) | |
| 51 | ||
| 52 | #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) | |
| 53 | ||
| 54 | #define GDT_ENTRY_DEFAULT_USER_CS 14 | |
| 55 | #define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3) | |
| 56 | ||
| 57 | #define GDT_ENTRY_DEFAULT_USER_DS 15 | |
| 58 | #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3) | |
| 59 | ||
| 60 | #define GDT_ENTRY_KERNEL_BASE 12 | |
| 61 | ||
| 62 | #define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0) | |
| 63 | #define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8) | |
| 64 | ||
| 65 | #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1) | |
| 66 | #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8) | |
| 67 | ||
| 68 | #define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4) | |
| 69 | #define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5) | |
| 70 | ||
| 71 | #define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6) | |
| 72 | #define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11) | |
| 73 | ||
| 74 | #define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE + 14) | |
| 75 | #define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8) | |
| 76 | ||
| 7c3576d2 | 77 | #define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE + 15) |
| c5413fbe | 78 | #ifdef CONFIG_SMP |
| 7c3576d2 | 79 | #define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8) |
| c5413fbe JF |
80 | #else |
| 81 | #define __KERNEL_PERCPU 0 | |
| 82 | #endif | |
| 9ca36101 | 83 | |
| 1da177e4 LT |
84 | #define GDT_ENTRY_DOUBLEFAULT_TSS 31 |
| 85 | ||
| 86 | /* | |
| 87 | * The GDT has 32 entries | |
| 88 | */ | |
| 89 | #define GDT_ENTRIES 32 | |
| 1da177e4 LT |
90 | #define GDT_SIZE (GDT_ENTRIES * 8) |
| 91 | ||
| 92 | /* Simple and small GDT entries for booting only */ | |
| 93 | ||
| 94 | #define GDT_ENTRY_BOOT_CS 2 | |
| 95 | #define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) | |
| 96 | ||
| 97 | #define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) | |
| 98 | #define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) | |
| 99 | ||
| 5702d0f7 ZA |
100 | /* The PnP BIOS entries in the GDT */ |
| 101 | #define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0) | |
| 102 | #define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1) | |
| 103 | #define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2) | |
| 104 | #define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3) | |
| 105 | #define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4) | |
| 106 | ||
| 107 | /* The PnP BIOS selectors */ | |
| 108 | #define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */ | |
| 109 | #define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */ | |
| 110 | #define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */ | |
| 111 | #define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */ | |
| 112 | #define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */ | |
| 113 | ||
| 1da177e4 LT |
114 | /* |
| 115 | * The interrupt descriptor table has room for 256 idt's, | |
| 116 | * the global descriptor table is dependent on the number | |
| 117 | * of tasks we can have.. | |
| 118 | */ | |
| 119 | #define IDT_ENTRIES 256 | |
| 120 | ||
| 78be3706 RR |
121 | /* Bottom two bits of selector give the ring privilege level */ |
| 122 | #define SEGMENT_RPL_MASK 0x3 | |
| 123 | /* Bit 2 is table indicator (LDT/GDT) */ | |
| 124 | #define SEGMENT_TI_MASK 0x4 | |
| 125 | ||
| 126 | /* User mode is privilege level 3 */ | |
| 127 | #define USER_RPL 0x3 | |
| 128 | /* LDT segment has TI set, GDT has it cleared */ | |
| 129 | #define SEGMENT_LDT 0x4 | |
| 130 | #define SEGMENT_GDT 0x0 | |
| 131 | ||
| d3561b7f | 132 | #ifndef CONFIG_PARAVIRT |
| 78be3706 | 133 | #define get_kernel_rpl() 0 |
| 1da177e4 | 134 | #endif |
| 7b355202 ZA |
135 | /* |
| 136 | * Matching rules for certain types of segments. | |
| 137 | */ | |
| 138 | ||
| 139 | /* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */ | |
| 140 | #define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8) | |
| 141 | ||
| 142 | /* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */ | |
| 143 | #define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8) | |
| 144 | ||
| 145 | /* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */ | |
| 146 | #define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8) | |
| 147 | ||
| d3561b7f | 148 | #endif |