// wdm.h

VOID MmInitializeMdl(
  [in] PMDL   MemoryDescriptorList,
  [in] PVOID  BaseVa,
  [in] SIZE_T Length
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-wdm-mminitializemdl)

Description

The MmInitializeMdl macro initializes the header of an MDL.

Parameters

`MemoryDescriptorList` [in]

A pointer to the buffer to initialize as an MDL. For more information, see the following section.

`BaseVa` [in]

A pointer to the base virtual address of a buffer.

`Length` [in]

Specifies the length, in bytes, of the buffer to be described by the MDL. This routine supports a maximum buffer length of MAXULONG bytes.

Remarks

The buffer that _MemoryDescriptorList_ points to must be allocated in nonpaged memory. The size, in bytes, of this buffer must be at least sizeof(MDL) + sizeof(PFN_NUMBER) * ADDRESS_AND_SIZE_TO_SPAN_PAGES(_BaseVa_, _Length_).

View the official Windows Driver Kit DDI reference