MmSizeOfMdl function (wdm.h)

The MmSizeOfMdl routine returns the number of bytes to allocate for an MDL describing a given address range.

Syntax

SIZE_T MmSizeOfMdl(
  [in] PVOID  Base,
  [in] SIZE_T Length
);

[in] Base

Pointer to the base virtual address for the range.

[in] Length

Supplies the size, in bytes, of the range.

MmSizeOfMdl returns the number of bytes required to contain the MDL.

Memory for the MDL itself must be allocated from nonpaged pool.

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