SYSTEM_INFO (Compact 2013)

3/28/2014

This structure contains information about the current computer system. This includes the processor type, page size, memory addresses, and OEM identifier.

Syntax

typedef struct _SYSTEM_INFO {
  union {
  DWORD dwOemId;
  struct {
    WORD wProcessorArchitecture;
    WORD wReserved;
  };
};
  DWORD dwPageSize;
  LPVOID lpMinimumApplicationAddress;
  LPVOID lpMaximumApplicationAddress;
  DWORD dwActiveProcessorMask;
  DWORD dwNumberOfProcessors;
  DWORD dwProcessorType;
  DWORD dwAllocationGranularity;
  WORD wProcessorLevel;
  WORD wProcessorRevision;
} SYSTEM_INFO, *LPSYSTEM_INFO;

Members

• dwOemId
  Reserved.

• wProcessorArchitecture
  System processor architecture.

  The following list shows the possible values for this member:

  • PROCESSOR_ARCHITECTURE_INTEL
  • PROCESSOR_ARCHITECTURE_UNKNOWN
  • PROCESSOR_ARCHITECTURE_ARM

• wReserved
  Reserved.

• dwPageSize
  Page size and the granularity of page protection and commitment. This is the page size used by the VirtualAlloc function.

• lpMinimumApplicationAddress
  Pointer to the lowest memory address accessible to applications and DLLs.

• lpMaximumApplicationAddress
  Pointer to the highest memory address accessible to applications and DLLs.

• dwActiveProcessorMask
  Mask representing the set of processors configured into the system. Bit 0 is processor 0; bit 31 is processor 31.

• dwNumberOfProcessors
  Number of processors in the system. This member is not used in Windows Embedded Compact.

• dwProcessorType
  Type of processor in the system.

  This is no longer relevant. Use the wProcessorArchitecture, wProcessorLevel, and wProcessorRevision members to determine the type of processor.

  The following list shows the possible values:

  • PROCESSOR_INTEL_386
  • PROCESSOR_INTEL_486
  • PROCESSOR_INTEL_PENTIUM
  • PROCESSOR_INTEL_PENTIUMII
  • PROCESSOR_STRONGARM
  • PROCESSOR_ARM720

• dwAllocationGranularity
  The granularity with which virtual memory is allocated.

  For example, a VirtualAlloc request to allocate 1 byte will reserve an address space of dwAllocationGranularity bytes.

  This value was hard coded as 64 KB in the past, but other hardware architectures may require different values.

• wProcessorLevel
  System architecture-dependent processor level.

  The following table shows that if wProcessorArchitecture is PROCESSOR_ARCHITECTURE_INTEL, wProcessorLevel can be one of the following values.

  Value	Description
  4	Intel 80486
  5	Pentium

  The following table shows that if wProcessorArchitecture is PROCESSOR_ARCHITECTURE_ARM, wProcessorLevel can be one of the following values.

  Value	Description
  7	ARM version 7

• wProcessorRevision
  Specifies an architecture-dependent processor revision. The following table shows how the revision value is assembled for each type of processor architecture.

  Value	Description
  Intel 80386 or 80486	A value of the form xxyz. If xx is equal to 0xFF, y - 0xA is the model number, and z is the stepping identifier. For example, an Intel 80486-D0 system returns 0xFFD0. If xx is not equal to 0xFF, xx + 'A' is the stepping letter and yz is the minor stepping.
  ARM	Is a value from 1 to 16. Consult your ARM CPU manual.

Requirements

See Also

Reference

System Management Structures
GetSystemInfo
VirtualAlloc