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WRITE_REGISTER_ULONG function (wdm.h)

  • Article

The WRITE_REGISTER_ULONG routine dereferences the supplied pointer, inserts a memory barrier, and writes a ULONG value to the specified address.

Syntax

void WRITE_REGISTER_ULONG(
  [in] volatile ULONG *Register,
  [in] ULONG          Value
);

Parameters

[in] Register

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

[in] Value

Specifies a ULONG value to be written to the register.

Return value

None

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 WRITE_REGISTER_ULONG 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)