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104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
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/*++
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Copyright (c) Microsoft. All rights reserved.
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Module Name:
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FxRequestBufferUm.cpp
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Abstract:
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This module implements a memory union object
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Author:
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Environment:
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User mode only
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Revision History:
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--*/
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#include "FxSupportPch.hpp"
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extern "C" {
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#include "FxRequestBufferUm.tmh"
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}
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_Must_inspect_result_
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NTSTATUS
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FxRequestBuffer::GetOrAllocateMdl(
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__in PFX_DRIVER_GLOBALS FxDriverGlobals,
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__deref_out_opt PMDL* Mdl,
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__inout PMDL* MdlToFree,
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__inout PBOOLEAN UnlockWhenFreed,
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__in LOCK_OPERATION Operation,
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__in BOOLEAN ReuseMdl,
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__inout_opt size_t* SizeOfMdl
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)
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/*++
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Routine Description:
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This function attempts to reuse the passed-in MDL (if any) or allocates
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a new MDL if reuse flag isn't passed-in or if the existing MDL isn't
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big enough.
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Arguments:
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Return Value:
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FxDriverGlobals - Driver globals
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Mdl - on return it contains the MDL allocated/reused
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MdlToFree - pointer to any MDL
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* to be reused, if the size is <= current size, or
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* freed and set to newly allocated MDL
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UnlockWhenFreed - whether to unlock pages when freeing MDL
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(if FALSE, MDL may represent just MDL buffer but the pages
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might have already been unlocked)
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Operation - Operation to pass to MmLockPages
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ReuseMdl - whether to reuse *MdlToFree
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Please note that this can be FALSE even when MDL is supplied
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SizeOfMdl - on input contains size of *MdlToFree,
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on return contains size of *Mdl
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Remarks:
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*MdlToFree is modified only when this function frees the passed in MDL
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Otherwise it leaves it untouched. Caller is responsible for storing
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properly initialized value and/or freeing what's stored in the value.
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--*/
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{
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UNREFERENCED_PARAMETER(FxDriverGlobals);
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UNREFERENCED_PARAMETER(Mdl);
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UNREFERENCED_PARAMETER(MdlToFree);
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UNREFERENCED_PARAMETER(UnlockWhenFreed);
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UNREFERENCED_PARAMETER(Operation);
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UNREFERENCED_PARAMETER(ReuseMdl);
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UNREFERENCED_PARAMETER(SizeOfMdl);
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UfxVerifierTrapNotImpl();
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return STATUS_NOT_IMPLEMENTED;
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}
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VOID
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FxRequestBuffer::SetMemory(
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__in IFxMemory* Memory,
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__in PWDFMEMORY_OFFSET Offsets
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)
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{
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DataType = FxRequestBufferMemory;
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u.Memory.Memory = Memory;
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u.Memory.Offsets = Offsets;
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}
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