This structure contains information about the current computer system. This includes the processor type, page size, original equipment manufacturer (OEM) identifier, and other such information.
At a Glance
| Header file: | Winbase.h |
| Windows CE versions: | 1.0 and later |
Syntax
typedef struct _SYSTEM_INFO {
DWORD dwOemId;
struct {
WORD wProcessorArcheitecture;
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
An obsolete member that is not used by Windows CE.
wProcessorArchitecture
Specifies the system’s processor architecture. It is no longer relevant. Use the wProcessorArchitecture, wProcessorLevel, and wProcessorRevision members to determine the type of processor.
dwReserved
Reserved for future use.
dwPageSize
Specifies the 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 dynamic-link libraries (DLLs).
lpMaximumApplicationAddress
Pointer to the highest memory address accessible to applications and DLLs.
dwActiveProcessorMask
Specifies a mask representing the set of processors configured into the system. Bit 0 is processor 0; bit 31 is processor 31.
dwNumberOfProcessors
Specifies the number of processors in the system.
dwProcessorType
Specifies the type of processor in the system. This member is no longer relevant. Use the wProcessorArchitecture, wProcessorLevel, and wProcessorRevision members to determine the type of processor.
This member is one of the following values:
dwAllocationGranularity
Specifies 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 64K in the past, but other hardware architectures may require different values.
wProcessorLevel
Specifies the system’s architecture-dependent processor level.
If wProcessorArchitecture is PROCESSOR_ARCHITECTURE_INTEL, wProcessorLevel can be one of the following values:
| Value | Description |
| 4 | Intel 80486 |
| 5 | Pentium |
If wProcessorArchitecture is PROCESSOR_ARCHITECTURE_MIPS, wProcessorLevel is of the form 00XX, where XX is an 8-bit implementation number (bits 8-15 of the PRId register). The member can be the following value:
| Value | Description |
| 3 | MIPS R3000 |
| 0004 | MIPS R4000 |
| If wProcessorArchitecture is PROCESSOR_ARCHITECTURE_PPC, wProcessorLevel is of the form XXXX, where XXXXis a 16-bit processor version number (the high-order 16 bits of the Processor Version Register). |
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. | ||
| Intel Pentium, Cyrix, or NextGen 586 | A value of the form xxyy, where xx is the model number and yy is the stepping. For example, a value of 0x0201 indicates Model 2, Stepping 1. | |
| MIPS | A value of the form 00xx, where xx is the 8-bit revision number of the processor (the low-order 8 bits of the PRId register). | |
| ALPHA | A value of the form xxyy, where xxyy is the low-order 16 bits of the processor revision number from the firmware. Display this value as follows: | |
| Model ‘A’+xx, Pass yy | ||
| PPC | A value of the form xxyy, where xxyy is the low-order 16 bits of the Processor Version Register. Display this value as a fixed point number: | |
| xx.yy | ||
See Also