MmGetMdlVirtualAddress macro (wdm.h)
The MmGetMdlVirtualAddress macro returns the base virtual address of a buffer described by an MDL.
PVOID
MmGetMdlVirtualAddress (
_In_ PMDL Mdl
)
[in] Mdl
Pointer to an MDL that describes the buffer for which to return the initial virtual address.
None
MmGetMdlVirtualAddress returns the starting virtual address of the MDL.
MmGetMdlVirtualAddress returns a virtual address that is not necessarily valid in the current thread context. Lower-level drivers should not attempt to use the returned virtual address to access memory, particularly user memory space.
The returned address, used as an index to a physical address entry in the MDL, can be input to MapTransfer.
Callers of MmGetMdlVirtualAddress can be running at any IRQL. Usually, the caller is running at IRQL = DISPATCH_LEVEL because this routine is commonly called to obtain the CurrentVa parameter to MapTransfer.
Requirement | Value |
---|---|
Minimum supported client | Windows 2000 |
Header | wdm.h |
IRQL | Any level (see Remarks) |
DDI compliance rules | MdlAfterReqCompletedIntIoctlA(kmdf), MdlAfterReqCompletedIoctlA(kmdf), MdlAfterReqCompletedReadA(kmdf), MdlAfterReqCompletedWriteA(kmdf) |