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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _ASM_SEGMENT_H |
| 2 | #define _ASM_SEGMENT_H |
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| 3 | |||
| 4 | /* |
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| 5 | * The layout of the per-CPU GDT under Linux: |
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| 6 | * |
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| 7 | * 0 - null |
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| 8 | * 1 - reserved |
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| 9 | * 2 - reserved |
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| 10 | * 3 - reserved |
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| 11 | * |
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| 12 | * 4 - unused <==== new cacheline |
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| 13 | * 5 - unused |
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| 14 | * |
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| 15 | * ------- start of TLS (Thread-Local Storage) segments: |
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| 16 | * |
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| 17 | * 6 - TLS segment #1 [ glibc's TLS segment ] |
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| 18 | * 7 - TLS segment #2 [ Wine's %fs Win32 segment ] |
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| 19 | * 8 - TLS segment #3 |
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| 20 | * 9 - reserved |
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| 21 | * 10 - reserved |
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| 22 | * 11 - reserved |
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| 23 | * |
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| 24 | * ------- start of kernel segments: |
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| 25 | * |
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| 26 | * 12 - kernel code segment <==== new cacheline |
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| 27 | * 13 - kernel data segment |
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| 28 | * 14 - default user CS |
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| 29 | * 15 - default user DS |
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| 30 | * 16 - TSS |
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| 31 | * 17 - LDT |
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| 32 | * 18 - PNPBIOS support (16->32 gate) |
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| 33 | * 19 - PNPBIOS support |
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| 34 | * 20 - PNPBIOS support |
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| 35 | * 21 - PNPBIOS support |
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| 36 | * 22 - PNPBIOS support |
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| 37 | * 23 - APM BIOS support |
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| 38 | * 24 - APM BIOS support |
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| 39 | * 25 - APM BIOS support |
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| 40 | * |
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| 41 | * 26 - unused |
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| 42 | * 27 - unused |
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| 43 | * 28 - unused |
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| 44 | * 29 - unused |
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| 45 | * 30 - unused |
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| 46 | * 31 - TSS for double fault handler |
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| 47 | */ |
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| 48 | #define GDT_ENTRY_TLS_ENTRIES 3 |
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| 49 | #define GDT_ENTRY_TLS_MIN 6 |
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| 50 | #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1) |
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| 51 | |||
| 52 | #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) |
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| 53 | |||
| 54 | #define GDT_ENTRY_DEFAULT_USER_CS 14 |
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| 55 | #define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3) |
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| 56 | |||
| 57 | #define GDT_ENTRY_DEFAULT_USER_DS 15 |
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| 58 | #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3) |
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| 59 | |||
| 60 | #define GDT_ENTRY_KERNEL_BASE 12 |
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| 61 | |||
| 62 | #define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0) |
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| 63 | #define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8) |
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| 64 | |||
| 65 | #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1) |
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| 66 | #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8) |
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| 67 | |||
| 68 | #define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4) |
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| 69 | #define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5) |
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| 70 | |||
| 71 | #define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6) |
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| 72 | #define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11) |
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| 73 | |||
| 74 | #define GDT_ENTRY_DOUBLEFAULT_TSS 31 |
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| 75 | |||
| 76 | /* |
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| 77 | * The GDT has 32 entries |
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| 78 | */ |
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| 79 | #define GDT_ENTRIES 32 |
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| 80 | |||
| 81 | #define GDT_SIZE (GDT_ENTRIES * 8) |
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| 82 | |||
| 83 | /* Simple and small GDT entries for booting only */ |
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| 84 | |||
| 85 | #define GDT_ENTRY_BOOT_CS 2 |
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| 86 | #define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) |
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| 87 | |||
| 88 | #define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) |
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| 89 | #define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) |
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| 90 | |||
| 91 | /* |
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| 92 | * The interrupt descriptor table has room for 256 idt's, |
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| 93 | * the global descriptor table is dependent on the number |
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| 94 | * of tasks we can have.. |
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| 95 | */ |
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| 96 | #define IDT_ENTRIES 256 |
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| 97 | |||
| 98 | #endif |