// wdm.h

typedef struct _MDL {
  struct _MDL      *Next;
  CSHORT           Size;
  CSHORT           MdlFlags;
  struct _EPROCESS *Process;
  PVOID            MappedSystemVa;
  PVOID            StartVa;
  ULONG            ByteCount;
  ULONG            ByteOffset;
} MDL, *PMDL;
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Windows Driver Kit DDI reference (ns-wdm-_mdl)

_MDL structure

Description

An MDL structure is a partially opaque structure that represents a memory descriptor list (MDL).

Members

`Next`

Pointer to the next MDL in an MDL chain. For more information about MDL chains, see Using MDLs.

`Size`

`MdlFlags`

`Process`

`MappedSystemVa`

`StartVa`

`ByteCount`

`ByteOffset`

Remarks

An MDL describes the layout of a virtual memory buffer in physical memory. For more information, see Using MDLs.

MDL - NtDoc