1 | #ifndef _ASM_SEGMENT_H |
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2 | #define _ASM_SEGMENT_H |
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3 | |
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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 - ESPFIX small SS |
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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 | |
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52 | #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) |
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53 | |
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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 | |
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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 | |
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60 | #define GDT_ENTRY_KERNEL_BASE 12 |
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61 | |
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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 | #define GET_KERNEL_CS() (__KERNEL_CS | (xen_feature(XENFEAT_supervisor_mode_kernel)?0:1) ) |
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65 | |
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66 | #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1) |
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67 | #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8) |
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68 | #define GET_KERNEL_DS() (__KERNEL_DS | (xen_feature(XENFEAT_supervisor_mode_kernel)?0:1) ) |
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69 | |
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70 | #define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4) |
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71 | #define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5) |
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72 | |
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73 | #define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6) |
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74 | #define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11) |
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75 | |
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76 | #define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE + 14) |
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77 | #define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8) |
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78 | |
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79 | #define GDT_ENTRY_DOUBLEFAULT_TSS 31 |
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80 | |
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81 | /* |
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82 | * The GDT has 32 entries |
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83 | */ |
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84 | #define GDT_ENTRIES 32 |
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85 | |
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86 | #define GDT_SIZE (GDT_ENTRIES * 8) |
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87 | |
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88 | /* Simple and small GDT entries for booting only */ |
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89 | |
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90 | #define GDT_ENTRY_BOOT_CS 2 |
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91 | #define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) |
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92 | |
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93 | #define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) |
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94 | #define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) |
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95 | |
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96 | /* The PnP BIOS entries in the GDT */ |
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97 | #define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0) |
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98 | #define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1) |
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99 | #define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2) |
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100 | #define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3) |
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101 | #define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4) |
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102 | |
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103 | /* The PnP BIOS selectors */ |
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104 | #define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */ |
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105 | #define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */ |
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106 | #define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */ |
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107 | #define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */ |
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108 | #define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */ |
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109 | |
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110 | /* |
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111 | * The interrupt descriptor table has room for 256 idt's, |
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112 | * the global descriptor table is dependent on the number |
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113 | * of tasks we can have.. |
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114 | */ |
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115 | #define IDT_ENTRIES 256 |
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116 | |
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117 | #endif |
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