MmFreeContiguousMemory - NtDoc
Native API online documentation, based on the System Informer
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headers
// ntddk.h
VOID MmFreeContiguousMemory(
[in] PVOID BaseAddress
);
View the official Windows Driver Kit DDI reference// wdm.h
VOID MmFreeContiguousMemory(
[in] PVOID BaseAddress
);
View the official Windows Driver Kit DDI referenceNo description available.
The MmFreeContiguousMemory routine releases a range of physically contiguous memory that was allocated by an MmAllocateContiguousMemory*Xxx* routine.
BaseAddress [in]Pointer to the virtual address of the memory to be freed.
The MmFreeContiguousMemory routine frees a block of physically contiguous memory that was allocated by a previous call to the MmAllocateContiguousMemory, MmAllocateContiguousMemorySpecifyCache, or MmAllocateContiguousMemorySpecifyCacheNode routine. The BaseAddress parameter must be the base address that was obtained from the previous call to the MmAllocateContiguousMemory*Xxx* routine.
A device driver that must use contiguous memory should allocate only what it needs during driver initialization because physical memory is likely to become fragmented as the system runs. Such a driver must deallocate the memory when the driver is done using the memory.
Callers of MmFreeContiguousMemory must be running at IRQL = APC_LEVEL. For Windows Server 2008 and later versions of the Windows operating system, you can also call MmFreeContiguousMemory with IRQL <= DISPATCH_LEVEL. However, you can improve driver performance by calling at APC_LEVEL or below.
MmAllocateContiguousMemorySpecifyCache
MmAllocateContiguousMemorySpecifyCacheNode
The MmFreeContiguousMemory routine releases a range of physically contiguous memory that was allocated by an MmAllocateContiguousMemory*Xxx* routine.
BaseAddress [in]Pointer to the virtual address of the memory to be freed.
The MmFreeContiguousMemory routine frees a block of physically contiguous memory that was allocated by a previous call to the MmAllocateContiguousMemory, MmAllocateContiguousMemorySpecifyCache, or MmAllocateContiguousMemorySpecifyCacheNode routine. The BaseAddress parameter must be the base address that was obtained from the previous call to the MmAllocateContiguousMemory*Xxx* routine.
A device driver that must use contiguous memory should allocate only what it needs during driver initialization because physical memory is likely to become fragmented as the system runs. Such a driver must deallocate the memory when the driver is done using the memory.
Callers of MmFreeContiguousMemory must be running at IRQL = APC_LEVEL. For Windows Server 2008 and later versions of the Windows operating system, you can also call MmFreeContiguousMemory with IRQL <= DISPATCH_LEVEL. However, you can improve driver performance by calling at APC_LEVEL or below.
MmAllocateContiguousMemorySpecifyCache
MmAllocateContiguousMemorySpecifyCacheNode