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READ_REGISTER_USHORT function (wdm.h)

  • Article

The READ_REGISTER_USHORT routine dereferences the supplied pointer, inserts a memory barrier, and reads a USHORT value from the specified register address.

Syntax

USHORT READ_REGISTER_USHORT(
  [in] volatile USHORT *Register
);

Parameters

[in] Register

Pointer to the register address, which must be a mapped range in memory space.

Return value

READ_REGISTER_USHORT returns the USHORT value read from the specified register address.

Remarks

This routine inserts a memory barrier into your code. This barrier guarantees that every operation that appears in the source code before the call to this routine will complete before any operation that appears after the call.

For more info about memory barriers, see KeMemoryBarrier.

Callers of READ_REGISTER_USHORT can be running at any IRQL, assuming the Register is resident, mapped device memory.

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Universal
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h, Ioaccess.h, Miniport.h, Wudfwdm.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL Any level (see Remarks section)