MMPTE数据结构

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原文链接：http://www.cnblogs.com/fanzi2009/archive/2011/12/22/2297570.html

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#c/c++ #数据结构与算法

本文详细解析了MMPTE内存页表的结构及其在操作系统内存管理中的作用。介绍了MMPTE作为union类型，如何抽象PDE、PTE等数据结构，并详细解释了其内部各个字段的意义，如Valid、Write、Owner等位标识，以及PageFrameNumber等关键信息。

MMPTE其实是个union，它抽象了PDE，PTE，原型PTE等数据结构

kd> dt _MMPTE -r2
nt!_MMPTE
   +0x000 u                : __unnamed
      +0x000 Long             : Uint4B
      +0x000 Flush            : _HARDWARE_PTE_X86
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 Write            : Pos 1, 1 Bit
         +0x000 Owner            : Pos 2, 1 Bit
         +0x000 WriteThrough     : Pos 3, 1 Bit
         +0x000 CacheDisable     : Pos 4, 1 Bit
         +0x000 Accessed         : Pos 5, 1 Bit
         +0x000 Dirty            : Pos 6, 1 Bit
         +0x000 LargePage        : Pos 7, 1 Bit
         +0x000 Global           : Pos 8, 1 Bit
         +0x000 CopyOnWrite      : Pos 9, 1 Bit
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 reserved         : Pos 11, 1 Bit
         +0x000 PageFrameNumber : Pos 12, 20 Bits
      +0x000 Hard             : _MMPTE_HARDWARE
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 Writable         : Pos 1, 1 Bit
         +0x000 Owner            : Pos 2, 1 Bit
         +0x000 WriteThrough     : Pos 3, 1 Bit
         +0x000 CacheDisable     : Pos 4, 1 Bit
         +0x000 Accessed         : Pos 5, 1 Bit
         +0x000 Dirty            : Pos 6, 1 Bit
         +0x000 LargePage        : Pos 7, 1 Bit
         +0x000 Global           : Pos 8, 1 Bit
         +0x000 CopyOnWrite      : Pos 9, 1 Bit
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 Write            : Pos 11, 1 Bit
         +0x000 PageFrameNumber : Pos 12, 20 Bits
      +0x000 Proto            : _MMPTE_PROTOTYPE
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 ProtoAddressLow : Pos 1, 7 Bits
         +0x000 ReadOnly         : Pos 8, 1 Bit
         +0x000 WhichPool        : Pos 9, 1 Bit
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 ProtoAddressHigh : Pos 11, 21 Bits
      +0x000 Soft             : _MMPTE_SOFTWARE
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 PageFileLow      : Pos 1, 4 Bits
         +0x000 Protection       : Pos 5, 5 Bits
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 Transition       : Pos 11, 1 Bit
         +0x000 PageFileHigh     : Pos 12, 20 Bits
      +0x000 Trans            : _MMPTE_TRANSITION
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 Write            : Pos 1, 1 Bit
         +0x000 Owner            : Pos 2, 1 Bit
         +0x000 WriteThrough     : Pos 3, 1 Bit
         +0x000 CacheDisable     : Pos 4, 1 Bit
         +0x000 Protection       : Pos 5, 5 Bits
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 Transition       : Pos 11, 1 Bit
         +0x000 PageFrameNumber : Pos 12, 20 Bits
      +0x000 Subsect          : _MMPTE_SUBSECTION
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 SubsectionAddressLow : Pos 1, 4 Bits
         +0x000 Protection       : Pos 5, 5 Bits
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 SubsectionAddressHigh : Pos 11, 20 Bits
         +0x000 WhichPool        : Pos 31, 1 Bit
      +0x000 List             : _MMPTE_LIST
         +0x000 Valid            : Pos 0, 1 Bit
         +0x000 OneEntry         : Pos 1, 1 Bit
         +0x000 filler0          : Pos 2, 8 Bits
         +0x000 Prototype        : Pos 10, 1 Bit
         +0x000 filler1          : Pos 11, 1 Bit
         +0x000 NextEntry        : Pos 12, 20 Bits