You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
2.4 KiB
108 lines
2.4 KiB
/*++
|
|
|
|
Copyright (c) 1999-2000 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
mdlpool.h
|
|
|
|
Abstract:
|
|
|
|
This file contains definitions and function prototypes for manipulating
|
|
MDL buffer pools.
|
|
|
|
Author:
|
|
|
|
Shaun Cox (shaunco) 21-Oct-1999
|
|
|
|
--*/
|
|
|
|
#pragma once
|
|
|
|
|
|
// Creates a pool of MDLs built over non-paged pool. Each MDL describes
|
|
// a buffer that is BufferSize bytes long. If NULL is not returned,
|
|
// MdpDestroyPool should be called at a later time to reclaim the
|
|
// resources used by the pool.
|
|
//
|
|
// Arguments:
|
|
// BufferSize - The size, in bytes, of the buffer that each MDL
|
|
// should describe.
|
|
// Tag - The pool tag to be used internally for calls to
|
|
// ExAllocatePoolWithTag. This allows callers to track
|
|
// memory consumption for different pools.
|
|
//
|
|
// Returns the handle used to identify the pool.
|
|
//
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
|
//
|
|
HANDLE
|
|
MdpCreatePool(
|
|
IN USHORT BufferSize,
|
|
IN ULONG Tag
|
|
);
|
|
|
|
// Destroys a pool of MDLs previously created by a call to MdpCreatePool.
|
|
//
|
|
// Arguments:
|
|
// PoolHandle - Handle which identifies the pool being destroyed.
|
|
//
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
|
//
|
|
VOID
|
|
MdpDestroyPool(
|
|
IN HANDLE PoolHandle
|
|
);
|
|
|
|
// Returns an MDL allocated from a pool. NULL is returned if the
|
|
// request could not be granted.
|
|
//
|
|
// Arguments:
|
|
// PoolHandle - Handle which identifies the pool being allocated from.
|
|
// Buffer - Address to receive the pointer to the underlying mapped buffer
|
|
// described by the MDL.
|
|
//
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
|
//
|
|
#if MILLEN
|
|
PNDIS_BUFFER
|
|
#else
|
|
PMDL
|
|
#endif
|
|
MdpAllocate(
|
|
IN HANDLE PoolHandle,
|
|
OUT PVOID* Buffer
|
|
);
|
|
|
|
// Returns an MDL allocated from a pool. NULL is returned if the
|
|
// request could not be granted.
|
|
//
|
|
// Arguments:
|
|
// PoolHandle - Handle which identifies the pool being allocated from.
|
|
// Buffer - Address to receive the pointer to the underlying mapped buffer
|
|
// described by the MDL.
|
|
//
|
|
// Caller IRQL: [DISPATCH_LEVEL]
|
|
//
|
|
#if MILLEN
|
|
#define MdpAllocateAtDpcLevel MdpAllocate
|
|
#else
|
|
PMDL
|
|
MdpAllocateAtDpcLevel(
|
|
IN HANDLE PoolHandle,
|
|
OUT PVOID* Buffer
|
|
);
|
|
#endif
|
|
|
|
// Free an MDL to the pool from which it was allocated.
|
|
//
|
|
// Arguments:
|
|
// Mdl - An Mdl returned from a prior call to MdpAllocate.
|
|
//
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
|
//
|
|
VOID
|
|
MdpFree(
|
|
IN PMDL Mdl
|
|
);
|
|
|