1 | /******************************************************************* |
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2 | * File: omPage.h |
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3 | * Purpose: declaration of routines for primitve page managment |
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4 | * Author: obachman (Olaf Bachmann) |
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5 | * Created: 11/99 |
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6 | *******************************************************************/ |
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7 | #ifndef OM_PAGE_H |
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8 | #define OM_PAGE_H |
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9 | |
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10 | /*********************************************************************** |
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11 | * |
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12 | * Identifying whether an address is a BinAddr or LargeAddr: |
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13 | * For this to work, omRegisterBinAddr or omRegisterLargeAddr must be called |
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14 | * with every address gotten from an external malloc routine |
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15 | */ |
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16 | |
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17 | /* Here is how it works (assume SIZEOF_LONG == 4, SIZEOF_SYSTEM_PAGE = 2^12): |
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18 | Let |
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19 | Addr: | 15 | 5 | 12 | |
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20 | PAGE_INDEX PAGE_SHIFT PAGE_OFFSET |
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21 | |
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22 | PAGE_BASE |
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23 | |
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24 | omPageIndicies is an array of bit-fields which is indexed by |
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25 | PAGE_INDEX - omMinPageIndex. Its maximal length |
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26 | is 2^15. PAGE_SHIFT is used as index into the bit-field. |
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27 | If it's value is 1, then addr is from omPage, else |
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28 | not. |
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29 | |
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30 | omMinPageIndex is minimal page index of registered addr |
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31 | |
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32 | In other words: omIsPageAddr iff |
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33 | omPageIndicies[PAGE_INDEX - omMinPageIndex] & (1 << PAGE_SHIFT) */ |
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34 | |
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35 | |
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36 | #define OM_SIZEOF_INDEX_PAGE (SIZEOF_SYSTEM_PAGE << LOG_BIT_SIZEOF_LONG) |
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37 | |
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38 | #define omGetPageShiftOfAddr(addr) \ |
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39 | ((((unsigned long) addr) & (OM_SIZEOF_INDEX_PAGE -1)) >> LOG_BIT_SIZEOF_SYSTEM_PAGE) |
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40 | |
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41 | #define omGetPageIndexOfAddr(addr) \ |
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42 | (((unsigned long) addr) >> (LOG_BIT_SIZEOF_LONG + LOG_BIT_SIZEOF_SYSTEM_PAGE)) |
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43 | |
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44 | #define omIsPageAddr(addr) \ |
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45 | ((omPageIndicies[omGetPageIndexOfAddr(addr) - omMinPageIndex] & \ |
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46 | (((unsigned long)1) << omGetPageShiftOfAddr(addr))) != 0) |
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47 | |
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48 | extern void omPageIndexFault(unsigned long page_index); |
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49 | extern unsigned long omMaxPageIndex; |
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50 | extern unsigned long omMinPageIndex; |
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51 | extern unsigned long *omPageIndicies; |
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52 | |
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53 | #define omRegisterPageIndex(index) \ |
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54 | do \ |
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55 | { \ |
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56 | if (index < omMinPageIndex || index > omMaxPageIndex) \ |
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57 | { \ |
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58 | omPageIndexFault(index); \ |
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59 | } \ |
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60 | } \ |
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61 | while (0) |
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62 | |
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63 | #define omRegisterExternalAddr(addr) \ |
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64 | do \ |
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65 | { \ |
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66 | unsigned long _omPageIndex = omGetPageIndexOfAddr(addr); \ |
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67 | omRegisterPageIndex(_omPageIndex); \ |
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68 | omPageIndicies[_omPageIndex - omMinPageIndex] &= \ |
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69 | ~ (((unsigned long) 1) << omGetPageShiftOfAddr(addr)); \ |
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70 | } \ |
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71 | while (0) |
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72 | |
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73 | #define omRegisterPageAddr(addr) \ |
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74 | do \ |
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75 | { \ |
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76 | unsigned long _omPageIndex = omGetPageIndexOfAddr(addr); \ |
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77 | omRegisterPageIndex(_omPageIndex); \ |
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78 | omPageIndicies[_omPageIndex - omMinPageIndex] |= \ |
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79 | (((unsigned long) 1) << omGetPageShiftOfAddr(addr)); \ |
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80 | } \ |
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81 | while (0) |
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82 | |
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83 | /*********************************************************************** |
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84 | * |
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85 | * declarations of procedures |
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86 | */ |
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87 | |
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88 | void* omGetPage(); |
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89 | |
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90 | void omFreePage(void* page); |
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91 | |
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92 | void omReleaseFreePages(); |
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93 | |
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94 | int omGetNumberOfFreePages(); |
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95 | int omGetNumberOfUsedPages(); |
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96 | int omGetNumberOfAllocatedPages(); |
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97 | |
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98 | /*********************************************************************** |
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99 | * |
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100 | * Macros for page manipulations |
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101 | */ |
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102 | |
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103 | #define omIsAddrPageAligned(addr) \ |
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104 | (((long) (addr) & (SIZEOF_SYSTEM_PAGE -1)) == 0) |
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105 | |
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106 | #define omGetPageOfAddr(addr) \ |
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107 | ((void*) ((long) (addr) & ~(SIZEOF_SYSTEM_PAGE -1))) |
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108 | |
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109 | #define omGetBinPageOfAddr(addr) \ |
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110 | ((omBinPage) ((long) (addr) & ~(SIZEOF_SYSTEM_PAGE -1))) |
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111 | |
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112 | #define omIsAddrOnPage(addr, page) (omGetPageOfAddr(addr) == (void*) (page)) |
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113 | |
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114 | #define omAreAddrOnSamePage(a1, a2) \ |
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115 | (omGetPageOfAddr(a1) == omGetPageOfAddr(a2)) |
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116 | |
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117 | int omIsAddrOnFreePage(void* addr); |
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118 | int omIsAddrOnRegisteredPage(void* addr); |
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119 | |
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120 | #define omIsNotAddrOnFreePage(addr) (!omIsAddrOnFreePage(addr)) |
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121 | |
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122 | #endif /* OM_PAGE_H */ |
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