[e70e45] | 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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[13fe1b] | 13 | * For this to work, omRegisterBinAddr or omRegisterLargeAddr must be called |
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[e70e45] | 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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[384936] | 45 | ((omPageIndicies[omGetPageIndexOfAddr(addr) - omMinPageIndex] & \ |
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| 46 | (((unsigned long)1) << omGetPageShiftOfAddr(addr))) != 0) |
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[e70e45] | 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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[384936] | 69 | ~ (((unsigned long) 1) << omGetPageShiftOfAddr(addr)); \ |
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[e70e45] | 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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[384936] | 79 | (((unsigned long) 1) << omGetPageShiftOfAddr(addr)); \ |
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[e70e45] | 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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