PHYSICAL_ADDRESS

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最新推荐文章于 2024-12-30 16:23:30 发布

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文章标签： integer compiler struct documentation microsoft structure

本文介绍Windows系统中物理地址（PHYSICAL_ADDRESS）的定义与使用方法，并详细解析了64位整数类型LARGE_INTEGER的内部结构及其成员作用。

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这是我查找DDK的 ntdef.h 文件找到PHYSICAL_ADDRESS的定义：

.......................

typedef union _LARGE_INTEGER {
    struct {
        ULONG LowPart;
        LONG HighPart;
    };
    struct {
        ULONG LowPart;
        LONG HighPart;
    } u;
#endif //MIDL_PASS
    LONGLONG QuadPart;
} LARGE_INTEGER;

............................

typedef LARGE_INTEGER PHYSICAL_ADDRESS, *PPHYSICAL_ADDRESS;

物理内存结构体PHYSICAL_ADDRESS（定义在ceddkh中，用64位来代表物理地址，对大多数32位的cpu，只需吧HighPart设置为0即可）。

LARGE_INTEGER Union

Represents a 64-bit signed integer value.

Note Your C compiler may support 64-bit integers natively. For example, Microsoft Visual C++ supports the __int64 sized integer type. For more information, see the documentation included with your C compiler.

Syntax

Copy

typedef union _LARGE_INTEGER {
  struct {
    DWORD LowPart;
    LONG  HighPart;
  } ;
  struct {
    DWORD LowPart;
    LONG  HighPart;
  } u;
  LONGLONG QuadPart;
} LARGE_INTEGER, *PLARGE_INTEGER;

Members

LowPart

The low-order 32 bits.

HighPart

The high-order 32 bits.

LowPart

The low-order 32 bits.

HighPart

The high-order 32 bits.

QuadPart

A signed 64-bit integer.

Remarks

The LARGE_INTEGER structure is actually a union. If your compiler has built-in support for 64-bit integers, use the QuadPart member to store the 64-bit integer. Otherwise, use the LowPart and HighPart members to store the 64-bit integer.