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reactos/hal/halx86/generic/dma.c
Thomas Faber 6c93669012
[HAL] Use a spin lock for the DMA adapter list. CORE-16611 
This is necessary because HalPutDmaAdapter can be called at DISPATCH_LEVEL.
2020-02-09 08:32:56 +01:00

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/*
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: hal/halx86/generic/dma.c
* PURPOSE: DMA functions
* PROGRAMMERS: David Welch (welch@mcmail.com)
* Filip Navara (navaraf@reactos.com)
* UPDATE HISTORY:
* Created 22/05/98
*/
/**
* @page DMA Implementation Notes
*
* Concepts:
*
* - Map register
*
* Abstract encapsulation of physically contiguous buffer that resides
* in memory accessible by both the DMA device / controller and the system.
* The map registers are allocated and distributed on demand and are
* scarce resource.
*
* The actual use of map registers is to allow transfers from/to buffer
* located in physical memory at address inaccessible by the DMA device /
* controller directly. For such transfers the map register buffers
* are used as intermediate data storage.
*
* - Master adapter
*
* A container for map registers (typically corresponding to one physical
* bus connection type). There can be master adapters for 24-bit address
* ranges, 32-bit address ranges, etc. Every time a new DMA adapter is
* created it's associated with a corresponding master adapter that
* is used for any map register allocation requests.
*
* - Bus-master / Slave DMA
*
* Slave DMA is term used for DMA transfers done by the system (E)ISA
* controller as opposed to transfers mastered by the device itself
* (hence the name).
*
* For slave DMA special care is taken to actually access the system
* controller and handle the transfers. The relevant code is in
* HalpDmaInitializeEisaAdapter, HalReadDmaCounter, IoFlushAdapterBuffers
* and IoMapTransfer.
*
* Implementation:
*
* - Allocation of map registers
*
* Initial set of map registers is allocated on the system start to
* ensure that low memory won't get filled up later. Additional map
* registers are allocated as needed by HalpGrowMapBuffers. This
* routine is called on two places:
*
* - HalGetAdapter, since we're at PASSIVE_LEVEL and it's known that
* more map registers will probably be needed.
* - IoAllocateAdapterChannel (indirectly using HalpGrowMapBufferWorker
* since we're at DISPATCH_LEVEL and call HalpGrowMapBuffers directly)
* when no more map registers are free.
*
* Note that even if no more map registers can be allocated it's not
* the end of the world. The adapters waiting for free map registers
* are queued in the master adapter's queue and once one driver hands
* back it's map registers (using IoFreeMapRegisters or indirectly using
* the execution routine callback in IoAllocateAdapterChannel) the
* queue gets processed and the map registers are reassigned.
*/
/* INCLUDES *****************************************************************/
#include <hal.h>
#include <suppress.h>
#define NDEBUG
#include <debug.h>
#if defined(ALLOC_PRAGMA) && !defined(_MINIHAL_)
#pragma alloc_text(INIT, HalpInitDma)
#endif
#define MAX_SG_ELEMENTS 0x10
#ifndef _MINIHAL_
static KEVENT HalpDmaLock;
static KSPIN_LOCK HalpDmaAdapterListLock;
static LIST_ENTRY HalpDmaAdapterList;
static PADAPTER_OBJECT HalpEisaAdapter[8];
#endif
static BOOLEAN HalpEisaDma;
#ifndef _MINIHAL_
static PADAPTER_OBJECT HalpMasterAdapter;
#endif
static const ULONG_PTR HalpEisaPortPage[8] = {
FIELD_OFFSET(DMA_PAGE, Channel0),
FIELD_OFFSET(DMA_PAGE, Channel1),
FIELD_OFFSET(DMA_PAGE, Channel2),
FIELD_OFFSET(DMA_PAGE, Channel3),
0,
FIELD_OFFSET(DMA_PAGE, Channel5),
FIELD_OFFSET(DMA_PAGE, Channel6),
FIELD_OFFSET(DMA_PAGE, Channel7)
};
#ifndef _MINIHAL_
static DMA_OPERATIONS HalpDmaOperations = {
sizeof(DMA_OPERATIONS),
(PPUT_DMA_ADAPTER)HalPutDmaAdapter,
(PALLOCATE_COMMON_BUFFER)HalAllocateCommonBuffer,
(PFREE_COMMON_BUFFER)HalFreeCommonBuffer,
NULL, /* Initialized in HalpInitDma() */
NULL, /* Initialized in HalpInitDma() */
NULL, /* Initialized in HalpInitDma() */
NULL, /* Initialized in HalpInitDma() */
NULL, /* Initialized in HalpInitDma() */
(PGET_DMA_ALIGNMENT)HalpDmaGetDmaAlignment,
(PREAD_DMA_COUNTER)HalReadDmaCounter,
/* FIXME: Implement the S/G funtions. */
(PGET_SCATTER_GATHER_LIST)HalGetScatterGatherList,
(PPUT_SCATTER_GATHER_LIST)HalPutScatterGatherList,
NULL /*(PCALCULATE_SCATTER_GATHER_LIST_SIZE)HalCalculateScatterGatherListSize*/,
NULL /*(PBUILD_SCATTER_GATHER_LIST)HalBuildScatterGatherList*/,
NULL /*(PBUILD_MDL_FROM_SCATTER_GATHER_LIST)HalBuildMdlFromScatterGatherList*/
};
#endif
#define MAX_MAP_REGISTERS 64
#define TAG_DMA ' AMD'
/* FUNCTIONS *****************************************************************/
#ifndef _MINIHAL_
INIT_FUNCTION
VOID
HalpInitDma(VOID)
{
/*
* Initialize the DMA Operation table
*/
HalpDmaOperations.AllocateAdapterChannel = (PALLOCATE_ADAPTER_CHANNEL)IoAllocateAdapterChannel;
HalpDmaOperations.FlushAdapterBuffers = (PFLUSH_ADAPTER_BUFFERS)IoFlushAdapterBuffers;
HalpDmaOperations.FreeAdapterChannel = (PFREE_ADAPTER_CHANNEL)IoFreeAdapterChannel;
HalpDmaOperations.FreeMapRegisters = (PFREE_MAP_REGISTERS)IoFreeMapRegisters;
HalpDmaOperations.MapTransfer = (PMAP_TRANSFER)IoMapTransfer;
if (HalpBusType == MACHINE_TYPE_EISA)
{
/*
* Check if Extended DMA is available. We're just going to do a random
* read and write.
*/
WRITE_PORT_UCHAR(UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2)), 0x2A);
if (READ_PORT_UCHAR(UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaController2Pages.Channel2))) == 0x2A)
{
DPRINT1("Machine supports EISA DMA. Bus type: %lu\n", HalpBusType);
HalpEisaDma = TRUE;
}
}
/*
* Intialize all the global variables and allocate master adapter with
* first map buffers.
*/
InitializeListHead(&HalpDmaAdapterList);
KeInitializeSpinLock(&HalpDmaAdapterListLock);
KeInitializeEvent(&HalpDmaLock, NotificationEvent, TRUE);
HalpMasterAdapter = HalpDmaAllocateMasterAdapter();
/*
* Setup the HalDispatchTable callback for creating PnP DMA adapters. It's
* used by IoGetDmaAdapter in the kernel.
*/
HalGetDmaAdapter = HalpGetDmaAdapter;
}
#endif
/**
* @name HalpGetAdapterMaximumPhysicalAddress
*
* Get the maximum physical address acceptable by the device represented
* by the passed DMA adapter.
*/
PHYSICAL_ADDRESS
NTAPI
HalpGetAdapterMaximumPhysicalAddress(IN PADAPTER_OBJECT AdapterObject)
{
PHYSICAL_ADDRESS HighestAddress;
if (AdapterObject->MasterDevice)
{
if (AdapterObject->Dma64BitAddresses)
{
HighestAddress.QuadPart = 0xFFFFFFFFFFFFFFFFULL;
return HighestAddress;
}
else if (AdapterObject->Dma32BitAddresses)
{
HighestAddress.QuadPart = 0xFFFFFFFF;
return HighestAddress;
}
}
HighestAddress.QuadPart = 0xFFFFFF;
return HighestAddress;
}
#ifndef _MINIHAL_
/**
* @name HalpGrowMapBuffers
*
* Allocate initial, or additional, map buffers for DMA master adapter.
*
* @param MasterAdapter
* DMA master adapter to allocate buffers for.
* @param SizeOfMapBuffers
* Size of the map buffers to allocate (not including the size
* already allocated).
*/
BOOLEAN
NTAPI
HalpGrowMapBuffers(IN PADAPTER_OBJECT AdapterObject,
IN ULONG SizeOfMapBuffers)
{
PVOID VirtualAddress;
PHYSICAL_ADDRESS PhysicalAddress;
PHYSICAL_ADDRESS HighestAcceptableAddress;
PHYSICAL_ADDRESS LowestAcceptableAddress;
PHYSICAL_ADDRESS BoundryAddressMultiple;
KIRQL OldIrql;
ULONG MapRegisterCount;
/* Check if enough map register slots are available. */
MapRegisterCount = BYTES_TO_PAGES(SizeOfMapBuffers);
if (MapRegisterCount + AdapterObject->NumberOfMapRegisters > MAX_MAP_REGISTERS)
{
DPRINT("No more map register slots available! (Current: %d | Requested: %d | Limit: %d)\n",
AdapterObject->NumberOfMapRegisters,
MapRegisterCount,
MAX_MAP_REGISTERS);
return FALSE;
}
/*
* Allocate memory for the new map registers. For 32-bit adapters we use
* two passes in order not to waste scare resource (low memory).
*/
HighestAcceptableAddress = HalpGetAdapterMaximumPhysicalAddress(AdapterObject);
LowestAcceptableAddress.HighPart = 0;
LowestAcceptableAddress.LowPart = HighestAcceptableAddress.LowPart == 0xFFFFFFFF ? 0x1000000 : 0;
BoundryAddressMultiple.QuadPart = 0;
VirtualAddress = MmAllocateContiguousMemorySpecifyCache(MapRegisterCount << PAGE_SHIFT,
LowestAcceptableAddress,
HighestAcceptableAddress,
BoundryAddressMultiple,
MmNonCached);
if (!(VirtualAddress) && (LowestAcceptableAddress.LowPart))
{
LowestAcceptableAddress.LowPart = 0;
VirtualAddress = MmAllocateContiguousMemorySpecifyCache(MapRegisterCount << PAGE_SHIFT,
LowestAcceptableAddress,
HighestAcceptableAddress,
BoundryAddressMultiple,
MmNonCached);
}
if (!VirtualAddress) return FALSE;
PhysicalAddress = MmGetPhysicalAddress(VirtualAddress);
/*
* All the following must be done with the master adapter lock held
* to prevent corruption.
*/
KeAcquireSpinLock(&AdapterObject->SpinLock, &OldIrql);
/*
* Setup map register entries for the buffer allocated. Each entry has
* a virtual and physical address and corresponds to PAGE_SIZE large
* buffer.
*/
if (MapRegisterCount > 0)
{
PROS_MAP_REGISTER_ENTRY CurrentEntry, PreviousEntry;
CurrentEntry = AdapterObject->MapRegisterBase + AdapterObject->NumberOfMapRegisters;
do
{
/*
* Leave one entry free for every non-contiguous memory region
* in the map register bitmap. This ensures that we can search
* using RtlFindClearBits for contiguous map register regions.
*
* Also for non-EISA DMA leave one free entry for every 64Kb
* break, because the DMA controller can handle only coniguous
* 64Kb regions.
*/
if (CurrentEntry != AdapterObject->MapRegisterBase)
{
PreviousEntry = CurrentEntry - 1;
if ((PreviousEntry->PhysicalAddress.LowPart + PAGE_SIZE) == PhysicalAddress.LowPart)
{
if (!HalpEisaDma)
{
if ((PreviousEntry->PhysicalAddress.LowPart ^ PhysicalAddress.LowPart) & 0xFFFF0000)
{
CurrentEntry++;
AdapterObject->NumberOfMapRegisters++;
}
}
}
else
{
CurrentEntry++;
AdapterObject->NumberOfMapRegisters++;
}
}
RtlClearBit(AdapterObject->MapRegisters,
(ULONG)(CurrentEntry - AdapterObject->MapRegisterBase));
CurrentEntry->VirtualAddress = VirtualAddress;
CurrentEntry->PhysicalAddress = PhysicalAddress;
PhysicalAddress.LowPart += PAGE_SIZE;
VirtualAddress = (PVOID)((ULONG_PTR)VirtualAddress + PAGE_SIZE);
CurrentEntry++;
AdapterObject->NumberOfMapRegisters++;
MapRegisterCount--;
} while (MapRegisterCount);
}
KeReleaseSpinLock(&AdapterObject->SpinLock, OldIrql);
return TRUE;
}
/**
* @name HalpDmaAllocateMasterAdapter
*
* Helper routine to allocate and initialize master adapter object and it's
* associated map register buffers.
*
* @see HalpInitDma
*/
PADAPTER_OBJECT
NTAPI
HalpDmaAllocateMasterAdapter(VOID)
{
PADAPTER_OBJECT MasterAdapter;
ULONG Size, SizeOfBitmap;
SizeOfBitmap = MAX_MAP_REGISTERS;
Size = sizeof(ADAPTER_OBJECT);
Size += sizeof(RTL_BITMAP);
Size += (SizeOfBitmap + 7) >> 3;
MasterAdapter = ExAllocatePoolWithTag(NonPagedPool, Size, TAG_DMA);
if (!MasterAdapter) return NULL;
RtlZeroMemory(MasterAdapter, Size);
KeInitializeSpinLock(&MasterAdapter->SpinLock);
InitializeListHead(&MasterAdapter->AdapterQueue);
MasterAdapter->MapRegisters = (PVOID)(MasterAdapter + 1);
RtlInitializeBitMap(MasterAdapter->MapRegisters,
(PULONG)(MasterAdapter->MapRegisters + 1),
SizeOfBitmap);
RtlSetAllBits(MasterAdapter->MapRegisters);
MasterAdapter->NumberOfMapRegisters = 0;
MasterAdapter->CommittedMapRegisters = 0;
MasterAdapter->MapRegisterBase = ExAllocatePoolWithTag(NonPagedPool,
SizeOfBitmap *
sizeof(ROS_MAP_REGISTER_ENTRY),
TAG_DMA);
if (!MasterAdapter->MapRegisterBase)
{
ExFreePool(MasterAdapter);
return NULL;
}
RtlZeroMemory(MasterAdapter->MapRegisterBase,
SizeOfBitmap * sizeof(ROS_MAP_REGISTER_ENTRY));
if (!HalpGrowMapBuffers(MasterAdapter, 0x10000))
{
ExFreePool(MasterAdapter);
return NULL;
}
return MasterAdapter;
}
/**
* @name HalpDmaAllocateChildAdapter
*
* Helper routine of HalGetAdapter. Allocate child adapter object and
* fill out some basic fields.
*
* @see HalGetAdapter
*/
PADAPTER_OBJECT
NTAPI
HalpDmaAllocateChildAdapter(IN ULONG NumberOfMapRegisters,
IN PDEVICE_DESCRIPTION DeviceDescription)
{
PADAPTER_OBJECT AdapterObject;
OBJECT_ATTRIBUTES ObjectAttributes;
NTSTATUS Status;
HANDLE Handle;
InitializeObjectAttributes(&ObjectAttributes,
NULL,
OBJ_KERNEL_HANDLE | OBJ_PERMANENT,
NULL,
NULL);
Status = ObCreateObject(KernelMode,
IoAdapterObjectType,
&ObjectAttributes,
KernelMode,
NULL,
sizeof(ADAPTER_OBJECT),
0,
0,
(PVOID)&AdapterObject);
if (!NT_SUCCESS(Status)) return NULL;
Status = ObReferenceObjectByPointer(AdapterObject,
FILE_READ_DATA | FILE_WRITE_DATA,
IoAdapterObjectType,
KernelMode);
if (!NT_SUCCESS(Status)) return NULL;
RtlZeroMemory(AdapterObject, sizeof(ADAPTER_OBJECT));
Status = ObInsertObject(AdapterObject,
NULL,
FILE_READ_DATA | FILE_WRITE_DATA,
0,
NULL,
&Handle);
if (!NT_SUCCESS(Status)) return NULL;
ZwClose(Handle);
AdapterObject->DmaHeader.Version = (USHORT)DeviceDescription->Version;
AdapterObject->DmaHeader.Size = sizeof(ADAPTER_OBJECT);
AdapterObject->DmaHeader.DmaOperations = &HalpDmaOperations;
AdapterObject->MapRegistersPerChannel = 1;
AdapterObject->Dma32BitAddresses = DeviceDescription->Dma32BitAddresses;
AdapterObject->ChannelNumber = 0xFF;
AdapterObject->MasterAdapter = HalpMasterAdapter;
KeInitializeDeviceQueue(&AdapterObject->ChannelWaitQueue);
return AdapterObject;
}
#endif
/**
* @name HalpDmaInitializeEisaAdapter
*
* Setup DMA modes and extended modes for (E)ISA DMA adapter object.
*/
BOOLEAN
NTAPI
HalpDmaInitializeEisaAdapter(IN PADAPTER_OBJECT AdapterObject,
IN PDEVICE_DESCRIPTION DeviceDescription)
{
UCHAR Controller;
DMA_MODE DmaMode = {{0 }};
DMA_EXTENDED_MODE ExtendedMode = {{ 0 }};
PVOID AdapterBaseVa;
Controller = (DeviceDescription->DmaChannel & 4) ? 2 : 1;
if (Controller == 1)
{
AdapterBaseVa = UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaController1));
}
else
{
AdapterBaseVa = UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaController2));
}
AdapterObject->AdapterNumber = Controller;
AdapterObject->ChannelNumber = (UCHAR)(DeviceDescription->DmaChannel & 3);
AdapterObject->PagePort = (PUCHAR)HalpEisaPortPage[DeviceDescription->DmaChannel];
AdapterObject->Width16Bits = FALSE;
AdapterObject->AdapterBaseVa = AdapterBaseVa;
if (HalpEisaDma)
{
ExtendedMode.ChannelNumber = AdapterObject->ChannelNumber;
switch (DeviceDescription->DmaSpeed)
{
case Compatible: ExtendedMode.TimingMode = COMPATIBLE_TIMING; break;
case TypeA: ExtendedMode.TimingMode = TYPE_A_TIMING; break;
case TypeB: ExtendedMode.TimingMode = TYPE_B_TIMING; break;
case TypeC: ExtendedMode.TimingMode = BURST_TIMING; break;
default:
return FALSE;
}
switch (DeviceDescription->DmaWidth)
{
case Width8Bits: ExtendedMode.TransferSize = B_8BITS; break;
case Width16Bits: ExtendedMode.TransferSize = B_16BITS; break;
case Width32Bits: ExtendedMode.TransferSize = B_32BITS; break;
default:
return FALSE;
}
if (Controller == 1)
{
WRITE_PORT_UCHAR(UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaExtendedMode1)),
ExtendedMode.Byte);
}
else
{
WRITE_PORT_UCHAR(UlongToPtr(FIELD_OFFSET(EISA_CONTROL, DmaExtendedMode2)),
ExtendedMode.Byte);
}
}
else
{
/*
* Validate setup for non-busmaster DMA adapter. Secondary controller
* supports only 16-bit transfers and main controller supports only
* 8-bit transfers. Anything else is invalid.
*/
if (!DeviceDescription->Master)
{
if ((Controller == 2) && (DeviceDescription->DmaWidth == Width16Bits))
{
AdapterObject->Width16Bits = TRUE;
}
else if ((Controller != 1) || (DeviceDescription->DmaWidth != Width8Bits))
{
return FALSE;
}
}
}
DmaMode.Channel = AdapterObject->ChannelNumber;
DmaMode.AutoInitialize = DeviceDescription->AutoInitialize;
/*
* Set the DMA request mode.
*
* For (E)ISA bus master devices just unmask (enable) the DMA channel
* and set it to cascade mode. Otherwise just select the right one
* bases on the passed device description.
*/
if (DeviceDescription->Master)
{
DmaMode.RequestMode = CASCADE_REQUEST_MODE;
if (Controller == 1)
{
/* Set the Request Data */
_PRAGMA_WARNING_SUPPRESS(__WARNING_DEREF_NULL_PTR)
WRITE_PORT_UCHAR(&((PDMA1_CONTROL)AdapterBaseVa)->Mode, DmaMode.Byte);
/* Unmask DMA Channel */
WRITE_PORT_UCHAR(&((PDMA1_CONTROL)AdapterBaseVa)->SingleMask,
AdapterObject->ChannelNumber | DMA_CLEARMASK);
}
else
{
/* Set the Request Data */
WRITE_PORT_UCHAR(&((PDMA2_CONTROL)AdapterBaseVa)->Mode, DmaMode.Byte);
/* Unmask DMA Channel */
WRITE_PORT_UCHAR(&((PDMA2_CONTROL)AdapterBaseVa)->SingleMask,
AdapterObject->ChannelNumber | DMA_CLEARMASK);
}
}
else
{
if (DeviceDescription->DemandMode)
{
DmaMode.RequestMode = DEMAND_REQUEST_MODE;
}
else
{
DmaMode.RequestMode = SINGLE_REQUEST_MODE;
}
}
AdapterObject->AdapterMode = DmaMode;
return TRUE;
}
#ifndef _MINIHAL_
/**
* @name HalGetAdapter
*
* Allocate an adapter object for DMA device.
*
* @param DeviceDescription
* Structure describing the attributes of the device.
* @param NumberOfMapRegisters
* On return filled with the maximum number of map registers the
* device driver can allocate for DMA transfer operations.
*
* @return The DMA adapter on success, NULL otherwise.
*
* @implemented
*/
PADAPTER_OBJECT
NTAPI
HalGetAdapter(IN PDEVICE_DESCRIPTION DeviceDescription,
OUT PULONG NumberOfMapRegisters)
{
PADAPTER_OBJECT AdapterObject = NULL;
BOOLEAN EisaAdapter;
ULONG MapRegisters;
ULONG MaximumLength;
KIRQL OldIrql;
/* Validate parameters in device description */
if (DeviceDescription->Version > DEVICE_DESCRIPTION_VERSION2) return NULL;
/*
* See if we're going to use ISA/EISA DMA adapter. These adapters are
* special since they're reused.
*
* Also note that we check for channel number since there are only 8 DMA
* channels on ISA, so any request above this requires new adapter.
*/
if (((DeviceDescription->InterfaceType == Eisa) ||
(DeviceDescription->InterfaceType == Isa)) || !(DeviceDescription->Master))
{
if (((DeviceDescription->InterfaceType == Isa) ||
(DeviceDescription->InterfaceType == Eisa)) &&
(DeviceDescription->DmaChannel >= 8))
{
EisaAdapter = FALSE;
}
else
{
EisaAdapter = TRUE;
}
}
else
{
EisaAdapter = FALSE;
}
/*
* Disallow creating adapter for ISA/EISA DMA channel 4 since it's used
* for cascading the controllers and it's not available for software use.
*/
if ((EisaAdapter) && (DeviceDescription->DmaChannel == 4)) return NULL;
/*
* Calculate the number of map registers.
*
* - For EISA and PCI scatter/gather no map registers are needed.
* - For ISA slave scatter/gather one map register is needed.
* - For all other cases the number of map registers depends on
* DeviceDescription->MaximumLength.
*/
MaximumLength = DeviceDescription->MaximumLength & MAXLONG;
if ((DeviceDescription->ScatterGather) &&
((DeviceDescription->InterfaceType == Eisa) ||
(DeviceDescription->InterfaceType == PCIBus)))
{
MapRegisters = 0;
}
else if ((DeviceDescription->ScatterGather) && !(DeviceDescription->Master))
{
MapRegisters = 1;
}
else
{
/*
* In the equation below the additional map register added by
* the "+1" accounts for the case when a transfer does not start
* at a page-aligned address.
*/
MapRegisters = BYTES_TO_PAGES(MaximumLength) + 1;
if (MapRegisters > 16) MapRegisters = 16;
}
/*
* Acquire the DMA lock that is used to protect the EISA adapter array.
*/
KeWaitForSingleObject(&HalpDmaLock, Executive, KernelMode, FALSE, NULL);
/*
* Now we must get ahold of the adapter object. For first eight ISA/EISA
* channels there are static adapter objects that are reused and updated
* on succesive HalGetAdapter calls. In other cases a new adapter object
* is always created and it's to the DMA adapter list (HalpDmaAdapterList).
*/
if (EisaAdapter)
{
AdapterObject = HalpEisaAdapter[DeviceDescription->DmaChannel];
if (AdapterObject)
{
if ((AdapterObject->NeedsMapRegisters) &&
(MapRegisters > AdapterObject->MapRegistersPerChannel))
{
AdapterObject->MapRegistersPerChannel = MapRegisters;
}
}
}
if (AdapterObject == NULL)
{
AdapterObject = HalpDmaAllocateChildAdapter(MapRegisters, DeviceDescription);
if (AdapterObject == NULL)
{
KeSetEvent(&HalpDmaLock, 0, 0);
return NULL;
}
if (EisaAdapter)
{
HalpEisaAdapter[DeviceDescription->DmaChannel] = AdapterObject;
}
if (MapRegisters > 0)
{
AdapterObject->NeedsMapRegisters = TRUE;
AdapterObject->MapRegistersPerChannel = MapRegisters;
}
else
{
AdapterObject->NeedsMapRegisters = FALSE;
if (DeviceDescription->Master)
{
AdapterObject->MapRegistersPerChannel = BYTES_TO_PAGES(MaximumLength) + 1;
}
else
{
AdapterObject->MapRegistersPerChannel = 1;
}
}
}
/*
* Release the DMA lock. HalpEisaAdapter will no longer be touched,
* so we don't need it.
*/
KeSetEvent(&HalpDmaLock, 0, 0);
if (!EisaAdapter)
{
/* If it's not one of the static adapters, add it to the list */
KeAcquireSpinLock(&HalpDmaAdapterListLock, &OldIrql);
InsertTailList(&HalpDmaAdapterList, &AdapterObject->AdapterList);
KeReleaseSpinLock(&HalpDmaAdapterListLock, OldIrql);
}
/*
* Setup the values in the adapter object that are common for all
* types of buses.
*/
if (DeviceDescription->Version >= DEVICE_DESCRIPTION_VERSION1)
{
AdapterObject->IgnoreCount = DeviceDescription->IgnoreCount;
}
else
{
AdapterObject->IgnoreCount = 0;
}
AdapterObject->Dma32BitAddresses = DeviceDescription->Dma32BitAddresses;
AdapterObject->Dma64BitAddresses = DeviceDescription->Dma64BitAddresses;
AdapterObject->ScatterGather = DeviceDescription->ScatterGather;
AdapterObject->MasterDevice = DeviceDescription->Master;
*NumberOfMapRegisters = AdapterObject->MapRegistersPerChannel;
/*
* For non-(E)ISA adapters we have already done all the work. On the
* other hand for (E)ISA adapters we must still setup the DMA modes
* and prepare the controller.
*/
if (EisaAdapter)
{
if (!HalpDmaInitializeEisaAdapter(AdapterObject, DeviceDescription))
{
ObDereferenceObject(AdapterObject);
return NULL;
}
}
return AdapterObject;
}
/**
* @name HalpGetDmaAdapter
*
* Internal routine to allocate PnP DMA adapter object. It's exported through
* HalDispatchTable and used by IoGetDmaAdapter.
*
* @see HalGetAdapter
*/
PDMA_ADAPTER
NTAPI
HalpGetDmaAdapter(IN PVOID Context,
IN PDEVICE_DESCRIPTION DeviceDescription,
OUT PULONG NumberOfMapRegisters)
{
return &HalGetAdapter(DeviceDescription, NumberOfMapRegisters)->DmaHeader;
}
/**
* @name HalPutDmaAdapter
*
* Internal routine to free DMA adapter and resources for reuse. It's exported
* using the DMA_OPERATIONS interface by HalGetAdapter.
*
* @see HalGetAdapter
*/
VOID
NTAPI
HalPutDmaAdapter(IN PADAPTER_OBJECT AdapterObject)
{
KIRQL OldIrql;
if (AdapterObject->ChannelNumber == 0xFF)
{
KeAcquireSpinLock(&HalpDmaAdapterListLock, &OldIrql);
RemoveEntryList(&AdapterObject->AdapterList);
KeReleaseSpinLock(&HalpDmaAdapterListLock, OldIrql);
}
ObDereferenceObject(AdapterObject);
}
/**
* @name HalAllocateCommonBuffer
*
* Allocates memory that is visible to both the processor(s) and the DMA
* device.
*
* @param AdapterObject
* Adapter object representing the bus master or system dma controller.
* @param Length
* Number of bytes to allocate.
* @param LogicalAddress
* Logical address the driver can use to access the buffer.
* @param CacheEnabled
* Specifies if the memory can be cached.
*
* @return The base virtual address of the memory allocated or NULL on failure.
*
* @remarks
* On real NT x86 systems the CacheEnabled parameter is ignored, we honour
* it. If it proves to cause problems change it.
*
* @see HalFreeCommonBuffer
*
* @implemented
*/
PVOID
NTAPI
HalAllocateCommonBuffer(IN PADAPTER_OBJECT AdapterObject,
IN ULONG Length,
IN PPHYSICAL_ADDRESS LogicalAddress,
IN BOOLEAN CacheEnabled)
{
PHYSICAL_ADDRESS LowestAcceptableAddress;
PHYSICAL_ADDRESS HighestAcceptableAddress;
PHYSICAL_ADDRESS BoundryAddressMultiple;
PVOID VirtualAddress;
LowestAcceptableAddress.QuadPart = 0;
HighestAcceptableAddress = HalpGetAdapterMaximumPhysicalAddress(AdapterObject);
BoundryAddressMultiple.QuadPart = 0;
/*
* For bus-master DMA devices the buffer mustn't cross 4Gb boundary. For
* slave DMA devices the 64Kb boundary mustn't be crossed since the
* controller wouldn't be able to handle it.
*/
if (AdapterObject->MasterDevice)
{
BoundryAddressMultiple.HighPart = 1;
}
else
{
BoundryAddressMultiple.LowPart = 0x10000;
}
VirtualAddress = MmAllocateContiguousMemorySpecifyCache(Length,
LowestAcceptableAddress,
HighestAcceptableAddress,
BoundryAddressMultiple,
CacheEnabled ? MmCached :
MmNonCached);
if (VirtualAddress == NULL) return NULL;
*LogicalAddress = MmGetPhysicalAddress(VirtualAddress);
return VirtualAddress;
}
/**
* @name HalFreeCommonBuffer
*
* Free common buffer allocated with HalAllocateCommonBuffer.
*
* @see HalAllocateCommonBuffer
*
* @implemented
*/
VOID
NTAPI
HalFreeCommonBuffer(IN PADAPTER_OBJECT AdapterObject,
IN ULONG Length,
IN PHYSICAL_ADDRESS LogicalAddress,
IN PVOID VirtualAddress,
IN BOOLEAN CacheEnabled)
{
MmFreeContiguousMemorySpecifyCache(VirtualAddress,
Length,
CacheEnabled ? MmCached : MmNonCached);
}
typedef struct _SCATTER_GATHER_CONTEXT {
PADAPTER_OBJECT AdapterObject;
PMDL Mdl;
PUCHAR CurrentVa;
ULONG Length;
PDRIVER_LIST_CONTROL AdapterListControlRoutine;
PVOID AdapterListControlContext, MapRegisterBase;
ULONG MapRegisterCount;
BOOLEAN WriteToDevice;
WAIT_CONTEXT_BLOCK Wcb;
} SCATTER_GATHER_CONTEXT, *PSCATTER_GATHER_CONTEXT;
IO_ALLOCATION_ACTION
NTAPI
HalpScatterGatherAdapterControl(IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID MapRegisterBase,
IN PVOID Context)
{
PSCATTER_GATHER_CONTEXT AdapterControlContext = Context;
PADAPTER_OBJECT AdapterObject = AdapterControlContext->AdapterObject;
PSCATTER_GATHER_LIST ScatterGatherList;
SCATTER_GATHER_ELEMENT TempElements[MAX_SG_ELEMENTS];
ULONG ElementCount = 0, RemainingLength = AdapterControlContext->Length;
PUCHAR CurrentVa = AdapterControlContext->CurrentVa;
/* Store the map register base for later in HalPutScatterGatherList */
AdapterControlContext->MapRegisterBase = MapRegisterBase;
while (RemainingLength > 0 && ElementCount < MAX_SG_ELEMENTS)
{
TempElements[ElementCount].Length = RemainingLength;
TempElements[ElementCount].Reserved = 0;
TempElements[ElementCount].Address = IoMapTransfer(AdapterObject,
AdapterControlContext->Mdl,
MapRegisterBase,
CurrentVa + (AdapterControlContext->Length - RemainingLength),
&TempElements[ElementCount].Length,
AdapterControlContext->WriteToDevice);
if (TempElements[ElementCount].Length == 0)
break;
DPRINT("Allocated one S/G element: 0x%I64u with length: 0x%x\n",
TempElements[ElementCount].Address.QuadPart,
TempElements[ElementCount].Length);
ASSERT(TempElements[ElementCount].Length <= RemainingLength);
RemainingLength -= TempElements[ElementCount].Length;
ElementCount++;
}
if (RemainingLength > 0)
{
DPRINT1("Scatter/gather list construction failed!\n");
return DeallocateObject;
}
ScatterGatherList = ExAllocatePoolWithTag(NonPagedPool,
sizeof(SCATTER_GATHER_LIST) + sizeof(SCATTER_GATHER_ELEMENT) * ElementCount,
TAG_DMA);
ASSERT(ScatterGatherList);
ScatterGatherList->NumberOfElements = ElementCount;
ScatterGatherList->Reserved = (ULONG_PTR)AdapterControlContext;
RtlCopyMemory(ScatterGatherList->Elements,
TempElements,
sizeof(SCATTER_GATHER_ELEMENT) * ElementCount);
DPRINT("Initiating S/G DMA with %d element(s)\n", ElementCount);
AdapterControlContext->AdapterListControlRoutine(DeviceObject,
Irp,
ScatterGatherList,
AdapterControlContext->AdapterListControlContext);
return DeallocateObjectKeepRegisters;
}
/**
* @name HalGetScatterGatherList
*
* Creates a scatter-gather list to be using in scatter/gather DMA
*
* @param AdapterObject
* Adapter object representing the bus master or system dma controller.
* @param DeviceObject
* The device target for DMA.
* @param Mdl
* The MDL that describes the buffer to be mapped.
* @param CurrentVa
* The current VA in the buffer to be mapped for transfer.
* @param Length
* Specifies the length of data in bytes to be mapped.
* @param ExecutionRoutine
* A caller supplied AdapterListControl routine to be called when DMA is available.
* @param Context
* Context passed to the AdapterListControl routine.
* @param WriteToDevice
* Indicates direction of DMA operation.
*
* @return The status of the operation.
*
* @see HalPutScatterGatherList
*
* @implemented
*/
NTSTATUS
NTAPI
HalGetScatterGatherList(IN PADAPTER_OBJECT AdapterObject,
IN PDEVICE_OBJECT DeviceObject,
IN PMDL Mdl,
IN PVOID CurrentVa,
IN ULONG Length,
IN PDRIVER_LIST_CONTROL ExecutionRoutine,
IN PVOID Context,
IN BOOLEAN WriteToDevice)
{
PSCATTER_GATHER_CONTEXT AdapterControlContext;
AdapterControlContext = ExAllocatePoolWithTag(NonPagedPool, sizeof(SCATTER_GATHER_CONTEXT), TAG_DMA);
if (!AdapterControlContext) return STATUS_INSUFFICIENT_RESOURCES;
AdapterControlContext->AdapterObject = AdapterObject;
AdapterControlContext->Mdl = Mdl;
AdapterControlContext->CurrentVa = CurrentVa;
AdapterControlContext->Length = Length;
AdapterControlContext->MapRegisterCount = PAGE_ROUND_UP(Length) >> PAGE_SHIFT;
AdapterControlContext->AdapterListControlRoutine = ExecutionRoutine;
AdapterControlContext->AdapterListControlContext = Context;
AdapterControlContext->WriteToDevice = WriteToDevice;
AdapterControlContext->Wcb.DeviceObject = DeviceObject;
AdapterControlContext->Wcb.DeviceContext = AdapterControlContext;
AdapterControlContext->Wcb.CurrentIrp = DeviceObject->CurrentIrp;
return HalAllocateAdapterChannel(AdapterObject,
&AdapterControlContext->Wcb,
AdapterControlContext->MapRegisterCount,
HalpScatterGatherAdapterControl);
}
/**
* @name HalPutScatterGatherList
*
* Frees a scatter-gather list allocated from HalGetScatterGatherList
*
* @param AdapterObject
* Adapter object representing the bus master or system dma controller.
* @param ScatterGather
* The scatter/gather list to be freed.
* @param WriteToDevice
* Indicates direction of DMA operation.
*
* @return None
*
* @see HalGetScatterGatherList
*
* @implemented
*/
VOID
NTAPI
HalPutScatterGatherList(IN PADAPTER_OBJECT AdapterObject,
IN PSCATTER_GATHER_LIST ScatterGather,
IN BOOLEAN WriteToDevice)
{
PSCATTER_GATHER_CONTEXT AdapterControlContext = (PSCATTER_GATHER_CONTEXT)ScatterGather->Reserved;
ULONG i;
for (i = 0; i < ScatterGather->NumberOfElements; i++)
{
IoFlushAdapterBuffers(AdapterObject,
AdapterControlContext->Mdl,
AdapterControlContext->MapRegisterBase,
AdapterControlContext->CurrentVa,
ScatterGather->Elements[i].Length,
AdapterControlContext->WriteToDevice);
AdapterControlContext->CurrentVa += ScatterGather->Elements[i].Length;
}
IoFreeMapRegisters(AdapterObject,
AdapterControlContext->MapRegisterBase,
AdapterControlContext->MapRegisterCount);
DPRINT("S/G DMA has finished!\n");
ExFreePoolWithTag(AdapterControlContext, TAG_DMA);
ExFreePoolWithTag(ScatterGather, TAG_DMA);
}
#endif
/**
* @name HalpDmaGetDmaAlignment
*
* Internal routine to return the DMA alignment requirement. It's exported
* using the DMA_OPERATIONS interface by HalGetAdapter.
*
* @see HalGetAdapter
*/
ULONG
NTAPI
HalpDmaGetDmaAlignment(IN PADAPTER_OBJECT AdapterObject)
{
return 1;
}
/*
* @name HalReadDmaCounter
*
* Read DMA operation progress counter.
*
* @implemented
*/
ULONG
NTAPI
HalReadDmaCounter(IN PADAPTER_OBJECT AdapterObject)
{
KIRQL OldIrql;
ULONG Count, OldCount;
ASSERT(!AdapterObject->MasterDevice);
/*
* Acquire the master adapter lock since we're going to mess with the
* system DMA controller registers and we really don't want anyone
* to do the same at the same time.
*/
KeAcquireSpinLock(&AdapterObject->MasterAdapter->SpinLock, &OldIrql);
/* Send the request to the specific controller. */
if (AdapterObject->AdapterNumber == 1)
{
PDMA1_CONTROL DmaControl1 = AdapterObject->AdapterBaseVa;
Count = 0xffff00;
do
{
OldCount = Count;
/* Send Reset */
WRITE_PORT_UCHAR(&DmaControl1->ClearBytePointer, 0);
/* Read Count */
Count = READ_PORT_UCHAR(&DmaControl1->DmaAddressCount
[AdapterObject->ChannelNumber].DmaBaseCount);
Count |= READ_PORT_UCHAR(&DmaControl1->DmaAddressCount
[AdapterObject->ChannelNumber].DmaBaseCount) << 8;
} while (0xffff00 & (OldCount ^ Count));
}
else
{
PDMA2_CONTROL DmaControl2 = AdapterObject->AdapterBaseVa;
Count = 0xffff00;
do
{
OldCount = Count;
/* Send Reset */
WRITE_PORT_UCHAR(&DmaControl2->ClearBytePointer, 0);
/* Read Count */
Count = READ_PORT_UCHAR(&DmaControl2->DmaAddressCount
[AdapterObject->ChannelNumber].DmaBaseCount);
Count |= READ_PORT_UCHAR(&DmaControl2->DmaAddressCount
[AdapterObject->ChannelNumber].DmaBaseCount) << 8;
} while (0xffff00 & (OldCount ^ Count));
}
KeReleaseSpinLock(&AdapterObject->MasterAdapter->SpinLock, OldIrql);
Count++;
Count &= 0xffff;
if (AdapterObject->Width16Bits) Count *= 2;
return Count;
}
#ifndef _MINIHAL_
/**
* @name HalpGrowMapBufferWorker
*
* Helper routine of HalAllocateAdapterChannel for allocating map registers
* at PASSIVE_LEVEL in work item.
*/
VOID
NTAPI
HalpGrowMapBufferWorker(IN PVOID DeferredContext)
{
PGROW_WORK_ITEM WorkItem = (PGROW_WORK_ITEM)DeferredContext;
KIRQL OldIrql;
BOOLEAN Succeeded;
/*
* Try to allocate new map registers for the adapter.
*
* NOTE: The NT implementation actually tries to allocate more map
* registers than needed as an optimization.
*/
KeWaitForSingleObject(&HalpDmaLock, Executive, KernelMode, FALSE, NULL);
Succeeded = HalpGrowMapBuffers(WorkItem->AdapterObject->MasterAdapter,
WorkItem->NumberOfMapRegisters << PAGE_SHIFT);
KeSetEvent(&HalpDmaLock, 0, 0);
if (Succeeded)
{
/*
* Flush the adapter queue now that new map registers are ready. The
* easiest way to do that is to call IoFreeMapRegisters to not free
* any registers. Note that we use the magic (PVOID)2 map register
* base to bypass the parameter checking.
*/
OldIrql = KfRaiseIrql(DISPATCH_LEVEL);
IoFreeMapRegisters(WorkItem->AdapterObject, (PVOID)2, 0);
KfLowerIrql(OldIrql);
}
ExFreePool(WorkItem);
}
/**
* @name HalAllocateAdapterChannel
*
* Setup map registers for an adapter object.
*
* @param AdapterObject
* Pointer to an ADAPTER_OBJECT to set up.
* @param WaitContextBlock
* Context block to be used with ExecutionRoutine.
* @param NumberOfMapRegisters
* Number of map registers requested.
* @param ExecutionRoutine
* Callback to call when map registers are allocated.
*
* @return
* If not enough map registers can be allocated then
* STATUS_INSUFFICIENT_RESOURCES is returned. If the function
* succeeds or the callback is queued for later delivering then
* STATUS_SUCCESS is returned.
*
* @see IoFreeAdapterChannel
*
* @implemented
*/
NTSTATUS
NTAPI
HalAllocateAdapterChannel(IN PADAPTER_OBJECT AdapterObject,
IN PWAIT_CONTEXT_BLOCK WaitContextBlock,
IN ULONG NumberOfMapRegisters,
IN PDRIVER_CONTROL ExecutionRoutine)
{
PADAPTER_OBJECT MasterAdapter;
PGROW_WORK_ITEM WorkItem;
ULONG Index = MAXULONG;
ULONG Result;
KIRQL OldIrql;
ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL);
/* Set up the wait context block in case we can't run right away. */
WaitContextBlock->DeviceRoutine = ExecutionRoutine;
WaitContextBlock->NumberOfMapRegisters = NumberOfMapRegisters;
/* Returns true if queued, else returns false and sets the queue to busy */
if (KeInsertDeviceQueue(&AdapterObject->ChannelWaitQueue,
&WaitContextBlock->WaitQueueEntry))
{
return STATUS_SUCCESS;
}
MasterAdapter = AdapterObject->MasterAdapter;
AdapterObject->NumberOfMapRegisters = NumberOfMapRegisters;
AdapterObject->CurrentWcb = WaitContextBlock;
if ((NumberOfMapRegisters) && (AdapterObject->NeedsMapRegisters))
{
if (NumberOfMapRegisters > AdapterObject->MapRegistersPerChannel)
{
AdapterObject->NumberOfMapRegisters = 0;
IoFreeAdapterChannel(AdapterObject);
return STATUS_INSUFFICIENT_RESOURCES;
}
/*
* Get the map registers. This is partly complicated by the fact
* that new map registers can only be allocated at PASSIVE_LEVEL
* and we're currently at DISPATCH_LEVEL. The following code has
* two code paths:
*
* - If there is no adapter queued for map register allocation,
* try to see if enough contiguous map registers are present.
* In case they're we can just get them and proceed further.
*
* - If some adapter is already present in the queue we must
* respect the order of adapters asking for map registers and
* so the fast case described above can't take place.
* This case is also entered if not enough coniguous map
* registers are present.
*
* A work queue item is allocated and queued, the adapter is
* also queued into the master adapter queue. The worker
* routine does the job of allocating the map registers at
* PASSIVE_LEVEL and calling the ExecutionRoutine.
*/
KeAcquireSpinLock(&MasterAdapter->SpinLock, &OldIrql);
if (IsListEmpty(&MasterAdapter->AdapterQueue))
{
Index = RtlFindClearBitsAndSet(MasterAdapter->MapRegisters, NumberOfMapRegisters, 0);
if (Index != MAXULONG)
{
AdapterObject->MapRegisterBase = MasterAdapter->MapRegisterBase + Index;
if (!AdapterObject->ScatterGather)
{
AdapterObject->MapRegisterBase = (PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)AdapterObject->MapRegisterBase | MAP_BASE_SW_SG);
}
}
}
if (Index == MAXULONG)
{
InsertTailList(&MasterAdapter->AdapterQueue, &AdapterObject->AdapterQueue);
WorkItem = ExAllocatePoolWithTag(NonPagedPool,
sizeof(GROW_WORK_ITEM),
TAG_DMA);
if (WorkItem)
{
ExInitializeWorkItem(&WorkItem->WorkQueueItem, HalpGrowMapBufferWorker, WorkItem);
WorkItem->AdapterObject = AdapterObject;
WorkItem->NumberOfMapRegisters = NumberOfMapRegisters;
ExQueueWorkItem(&WorkItem->WorkQueueItem, DelayedWorkQueue);
}
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
return STATUS_SUCCESS;
}
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
}
else
{
AdapterObject->MapRegisterBase = NULL;
AdapterObject->NumberOfMapRegisters = 0;
}
AdapterObject->CurrentWcb = WaitContextBlock;
Result = ExecutionRoutine(WaitContextBlock->DeviceObject,
WaitContextBlock->CurrentIrp,
AdapterObject->MapRegisterBase,
WaitContextBlock->DeviceContext);
/*
* Possible return values:
*
* - KeepObject
* Don't free any resources, the ADAPTER_OBJECT is still in use and
* the caller will call IoFreeAdapterChannel later.
*
* - DeallocateObject
* Deallocate the map registers and release the ADAPTER_OBJECT, so
* someone else can use it.
*
* - DeallocateObjectKeepRegisters
* Release the ADAPTER_OBJECT, but hang on to the map registers. The
* client will later call IoFreeMapRegisters.
*
* NOTE:
* IoFreeAdapterChannel runs the queue, so it must be called unless
* the adapter object is not to be freed.
*/
if (Result == DeallocateObject)
{
IoFreeAdapterChannel(AdapterObject);
}
else if (Result == DeallocateObjectKeepRegisters)
{
AdapterObject->NumberOfMapRegisters = 0;
IoFreeAdapterChannel(AdapterObject);
}
return STATUS_SUCCESS;
}
/**
* @name IoFreeAdapterChannel
*
* Free DMA resources allocated by IoAllocateAdapterChannel.
*
* @param AdapterObject
* Adapter object with resources to free.
*
* @remarks
* This function releases map registers registers assigned to the DMA
* adapter. After releasing the adapter, it checks the adapter's queue
* and runs each queued device object in series until the queue is
* empty. This is the only way the device queue is emptied.
*
* @see IoAllocateAdapterChannel
*
* @implemented
*/
VOID
NTAPI
IoFreeAdapterChannel(IN PADAPTER_OBJECT AdapterObject)
{
PADAPTER_OBJECT MasterAdapter;
PKDEVICE_QUEUE_ENTRY DeviceQueueEntry;
PWAIT_CONTEXT_BLOCK WaitContextBlock;
ULONG Index = MAXULONG;
ULONG Result;
KIRQL OldIrql;
MasterAdapter = AdapterObject->MasterAdapter;
for (;;)
{
/*
* To keep map registers, call here with AdapterObject->
* NumberOfMapRegisters set to zero. This trick is used in
* HalAllocateAdapterChannel for example.
*/
if (AdapterObject->NumberOfMapRegisters)
{
IoFreeMapRegisters(AdapterObject,
AdapterObject->MapRegisterBase,
AdapterObject->NumberOfMapRegisters);
}
DeviceQueueEntry = KeRemoveDeviceQueue(&AdapterObject->ChannelWaitQueue);
if (!DeviceQueueEntry) break;
WaitContextBlock = CONTAINING_RECORD(DeviceQueueEntry,
WAIT_CONTEXT_BLOCK,
WaitQueueEntry);
AdapterObject->CurrentWcb = WaitContextBlock;
AdapterObject->NumberOfMapRegisters = WaitContextBlock->NumberOfMapRegisters;
if ((WaitContextBlock->NumberOfMapRegisters) && (AdapterObject->MasterAdapter))
{
KeAcquireSpinLock(&MasterAdapter->SpinLock, &OldIrql);
if (IsListEmpty(&MasterAdapter->AdapterQueue))
{
Index = RtlFindClearBitsAndSet(MasterAdapter->MapRegisters,
WaitContextBlock->NumberOfMapRegisters,
0);
if (Index != MAXULONG)
{
AdapterObject->MapRegisterBase = MasterAdapter->MapRegisterBase + Index;
if (!AdapterObject->ScatterGather)
{
AdapterObject->MapRegisterBase =(PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)AdapterObject->MapRegisterBase | MAP_BASE_SW_SG);
}
}
}
if (Index == MAXULONG)
{
InsertTailList(&MasterAdapter->AdapterQueue, &AdapterObject->AdapterQueue);
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
break;
}
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
}
else
{
AdapterObject->MapRegisterBase = NULL;
AdapterObject->NumberOfMapRegisters = 0;
}
/* Call the adapter control routine. */
Result = ((PDRIVER_CONTROL)WaitContextBlock->DeviceRoutine)(WaitContextBlock->DeviceObject,
WaitContextBlock->CurrentIrp,
AdapterObject->MapRegisterBase,
WaitContextBlock->DeviceContext);
switch (Result)
{
case KeepObject:
/*
* We're done until the caller manually calls IoFreeAdapterChannel
* or IoFreeMapRegisters.
*/
return;
case DeallocateObjectKeepRegisters:
/*
* Hide the map registers so they aren't deallocated next time
* around.
*/
AdapterObject->NumberOfMapRegisters = 0;
break;
default:
break;
}
}
}
/**
* @name IoFreeMapRegisters
*
* Free map registers reserved by the system for a DMA.
*
* @param AdapterObject
* DMA adapter to free map registers on.
* @param MapRegisterBase
* Handle to map registers to free.
* @param NumberOfRegisters
* Number of map registers to be freed.
*
* @implemented
*/
VOID
NTAPI
IoFreeMapRegisters(IN PADAPTER_OBJECT AdapterObject,
IN PVOID MapRegisterBase,
IN ULONG NumberOfMapRegisters)
{
PADAPTER_OBJECT MasterAdapter = AdapterObject->MasterAdapter;
PLIST_ENTRY ListEntry;
KIRQL OldIrql;
ULONG Index;
ULONG Result;
ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL);
if (!(MasterAdapter) || !(MapRegisterBase)) return;
KeAcquireSpinLock(&MasterAdapter->SpinLock, &OldIrql);
if (NumberOfMapRegisters != 0)
{
PROS_MAP_REGISTER_ENTRY RealMapRegisterBase;
RealMapRegisterBase = (PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)MapRegisterBase & ~MAP_BASE_SW_SG);
RtlClearBits(MasterAdapter->MapRegisters,
(ULONG)(RealMapRegisterBase - MasterAdapter->MapRegisterBase),
NumberOfMapRegisters);
}
/*
* Now that we freed few map registers it's time to look at the master
* adapter queue and see if there is someone waiting for map registers.
*/
while (!IsListEmpty(&MasterAdapter->AdapterQueue))
{
ListEntry = RemoveHeadList(&MasterAdapter->AdapterQueue);
AdapterObject = CONTAINING_RECORD(ListEntry, struct _ADAPTER_OBJECT, AdapterQueue);
Index = RtlFindClearBitsAndSet(MasterAdapter->MapRegisters,
AdapterObject->NumberOfMapRegisters,
0);
if (Index == MAXULONG)
{
InsertHeadList(&MasterAdapter->AdapterQueue, ListEntry);
break;
}
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
AdapterObject->MapRegisterBase = MasterAdapter->MapRegisterBase + Index;
if (!AdapterObject->ScatterGather)
{
AdapterObject->MapRegisterBase =
(PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)AdapterObject->MapRegisterBase | MAP_BASE_SW_SG);
}
Result = ((PDRIVER_CONTROL)AdapterObject->CurrentWcb->DeviceRoutine)(AdapterObject->CurrentWcb->DeviceObject,
AdapterObject->CurrentWcb->CurrentIrp,
AdapterObject->MapRegisterBase,
AdapterObject->CurrentWcb->DeviceContext);
switch (Result)
{
case DeallocateObjectKeepRegisters:
AdapterObject->NumberOfMapRegisters = 0;
/* fall through */
case DeallocateObject:
if (AdapterObject->NumberOfMapRegisters)
{
KeAcquireSpinLock(&MasterAdapter->SpinLock, &OldIrql);
RtlClearBits(MasterAdapter->MapRegisters,
(ULONG)(AdapterObject->MapRegisterBase -
MasterAdapter->MapRegisterBase),
AdapterObject->NumberOfMapRegisters);
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
}
IoFreeAdapterChannel(AdapterObject);
break;
default:
break;
}
KeAcquireSpinLock(&MasterAdapter->SpinLock, &OldIrql);
}
KeReleaseSpinLock(&MasterAdapter->SpinLock, OldIrql);
}
/**
* @name HalpCopyBufferMap
*
* Helper function for copying data from/to map register buffers.
*
* @see IoFlushAdapterBuffers, IoMapTransfer
*/
VOID
NTAPI
HalpCopyBufferMap(IN PMDL Mdl,
IN PROS_MAP_REGISTER_ENTRY MapRegisterBase,
IN PVOID CurrentVa,
IN ULONG Length,
IN BOOLEAN WriteToDevice)
{
ULONG CurrentLength;
ULONG_PTR CurrentAddress;
ULONG ByteOffset;
PVOID VirtualAddress;
VirtualAddress = MmGetSystemAddressForMdlSafe(Mdl, HighPagePriority);
if (!VirtualAddress)
{
/*
* NOTE: On real NT a mechanism with reserved pages is implemented
* to handle this case in a slow, but graceful non-fatal way.
*/
KeBugCheckEx(HAL_MEMORY_ALLOCATION, PAGE_SIZE, 0, (ULONG_PTR)__FILE__, 0);
}
CurrentAddress = (ULONG_PTR)VirtualAddress +
(ULONG_PTR)CurrentVa -
(ULONG_PTR)MmGetMdlVirtualAddress(Mdl);
while (Length > 0)
{
ByteOffset = BYTE_OFFSET(CurrentAddress);
CurrentLength = PAGE_SIZE - ByteOffset;
if (CurrentLength > Length) CurrentLength = Length;
if (WriteToDevice)
{
RtlCopyMemory((PVOID)((ULONG_PTR)MapRegisterBase->VirtualAddress + ByteOffset),
(PVOID)CurrentAddress,
CurrentLength);
}
else
{
RtlCopyMemory((PVOID)CurrentAddress,
(PVOID)((ULONG_PTR)MapRegisterBase->VirtualAddress + ByteOffset),
CurrentLength);
}
Length -= CurrentLength;
CurrentAddress += CurrentLength;
MapRegisterBase++;
}
}
/**
* @name IoFlushAdapterBuffers
*
* Flush any data remaining in the DMA controller's memory into the host
* memory.
*
* @param AdapterObject
* The adapter object to flush.
* @param Mdl
* Original MDL to flush data into.
* @param MapRegisterBase
* Map register base that was just used by IoMapTransfer, etc.
* @param CurrentVa
* Offset into Mdl to be flushed into, same as was passed to
* IoMapTransfer.
* @param Length
* Length of the buffer to be flushed into.
* @param WriteToDevice
* TRUE if it's a write, FALSE if it's a read.
*
* @return TRUE in all cases.
*
* @remarks
* This copies data from the map register-backed buffer to the user's
* target buffer. Data are not in the user buffer until this function
* is called.
* For slave DMA transfers the controller channel is masked effectively
* stopping the current transfer.
*
* @unimplemented.
*/
BOOLEAN
NTAPI
IoFlushAdapterBuffers(IN PADAPTER_OBJECT AdapterObject,
IN PMDL Mdl,
IN PVOID MapRegisterBase,
IN PVOID CurrentVa,
IN ULONG Length,
IN BOOLEAN WriteToDevice)
{
BOOLEAN SlaveDma = FALSE;
PROS_MAP_REGISTER_ENTRY RealMapRegisterBase;
PHYSICAL_ADDRESS HighestAcceptableAddress;
PHYSICAL_ADDRESS PhysicalAddress;
PPFN_NUMBER MdlPagesPtr;
/* Sanity checks */
ASSERT_IRQL_LESS_OR_EQUAL(DISPATCH_LEVEL);
ASSERT(AdapterObject);
if (!AdapterObject->MasterDevice)
{
/* Mask out (disable) the DMA channel. */
if (AdapterObject->AdapterNumber == 1)
{
PDMA1_CONTROL DmaControl1 = AdapterObject->AdapterBaseVa;
WRITE_PORT_UCHAR(&DmaControl1->SingleMask,
AdapterObject->ChannelNumber | DMA_SETMASK);
}
else
{
PDMA2_CONTROL DmaControl2 = AdapterObject->AdapterBaseVa;
WRITE_PORT_UCHAR(&DmaControl2->SingleMask,
AdapterObject->ChannelNumber | DMA_SETMASK);
}
SlaveDma = TRUE;
}
/* This can happen if the device supports hardware scatter/gather. */
if (MapRegisterBase == NULL) return TRUE;
RealMapRegisterBase = (PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)MapRegisterBase & ~MAP_BASE_SW_SG);
if (!WriteToDevice)
{
if ((ULONG_PTR)MapRegisterBase & MAP_BASE_SW_SG)
{
if (RealMapRegisterBase->Counter != MAXULONG)
{
if ((SlaveDma) && !(AdapterObject->IgnoreCount))
{
Length -= HalReadDmaCounter(AdapterObject);
}
}
HalpCopyBufferMap(Mdl,
RealMapRegisterBase,
CurrentVa,
Length,
FALSE);
}
else
{
MdlPagesPtr = MmGetMdlPfnArray(Mdl);
MdlPagesPtr += ((ULONG_PTR)CurrentVa - (ULONG_PTR)Mdl->StartVa) >> PAGE_SHIFT;
PhysicalAddress.QuadPart = *MdlPagesPtr << PAGE_SHIFT;
PhysicalAddress.QuadPart += BYTE_OFFSET(CurrentVa);
HighestAcceptableAddress = HalpGetAdapterMaximumPhysicalAddress(AdapterObject);
if ((PhysicalAddress.QuadPart + Length) > HighestAcceptableAddress.QuadPart)
{
HalpCopyBufferMap(Mdl,
RealMapRegisterBase,
CurrentVa,
Length,
FALSE);
}
}
}
RealMapRegisterBase->Counter = 0;
return TRUE;
}
/**
* @name IoMapTransfer
*
* Map a DMA for transfer and do the DMA if it's a slave.
*
* @param AdapterObject
* Adapter object to do the DMA on. Bus-master may pass NULL.
* @param Mdl
* Locked-down user buffer to DMA in to or out of.
* @param MapRegisterBase
* Handle to map registers to use for this dma.
* @param CurrentVa
* Index into Mdl to transfer into/out of.
* @param Length
* Length of transfer. Number of bytes actually transferred on
* output.
* @param WriteToDevice
* TRUE if it's an output DMA, FALSE otherwise.
*
* @return
* A logical address that can be used to program a DMA controller, it's
* not meaningful for slave DMA device.
*
* @remarks
* This function does a copyover to contiguous memory <16MB represented
* by the map registers if needed. If the buffer described by MDL can be
* used as is no copyover is done.
* If it's a slave transfer, this function actually performs it.
*
* @implemented
*/
PHYSICAL_ADDRESS
NTAPI
IoMapTransfer(IN PADAPTER_OBJECT AdapterObject,
IN PMDL Mdl,
IN PVOID MapRegisterBase,
IN PVOID CurrentVa,
IN OUT PULONG Length,
IN BOOLEAN WriteToDevice)
{
PPFN_NUMBER MdlPagesPtr;
PFN_NUMBER MdlPage1, MdlPage2;
ULONG ByteOffset;
ULONG TransferOffset;
ULONG TransferLength;
BOOLEAN UseMapRegisters;
PROS_MAP_REGISTER_ENTRY RealMapRegisterBase;
PHYSICAL_ADDRESS PhysicalAddress;
PHYSICAL_ADDRESS HighestAcceptableAddress;
ULONG Counter;
DMA_MODE AdapterMode;
KIRQL OldIrql;
/*
* Precalculate some values that are used in all cases.
*
* ByteOffset is offset inside the page at which the transfer starts.
* MdlPagesPtr is pointer inside the MDL page chain at the page where the
* transfer start.
* PhysicalAddress is physical address corresponding to the transfer
* start page and offset.
* TransferLength is the initial length of the transfer, which is reminder
* of the first page. The actual value is calculated below.
*
* Note that all the variables can change during the processing which
* takes place below. These are just initial values.
*/
ByteOffset = BYTE_OFFSET(CurrentVa);
MdlPagesPtr = MmGetMdlPfnArray(Mdl);
MdlPagesPtr += ((ULONG_PTR)CurrentVa - (ULONG_PTR)Mdl->StartVa) >> PAGE_SHIFT;
PhysicalAddress.QuadPart = *MdlPagesPtr << PAGE_SHIFT;
PhysicalAddress.QuadPart += ByteOffset;
TransferLength = PAGE_SIZE - ByteOffset;
/*
* Special case for bus master adapters with S/G support. We can directly
* use the buffer specified by the MDL, so not much work has to be done.
*
* Just return the passed VA's corresponding physical address and update
* length to the number of physically contiguous bytes found. Also
* pages crossing the 4Gb boundary aren't considered physically contiguous.
*/
if (MapRegisterBase == NULL)
{
while (TransferLength < *Length)
{
MdlPage1 = *MdlPagesPtr;
MdlPage2 = *(MdlPagesPtr + 1);
if (MdlPage1 + 1 != MdlPage2) break;
if ((MdlPage1 ^ MdlPage2) & ~0xFFFFF) break;
TransferLength += PAGE_SIZE;
MdlPagesPtr++;
}
if (TransferLength < *Length) *Length = TransferLength;
return PhysicalAddress;
}
/*
* The code below applies to slave DMA adapters and bus master adapters
* without hardward S/G support.
*/
RealMapRegisterBase = (PROS_MAP_REGISTER_ENTRY)((ULONG_PTR)MapRegisterBase & ~MAP_BASE_SW_SG);
/*
* Try to calculate the size of the transfer. We can only transfer
* pages that are physically contiguous and that don't cross the
* 64Kb boundary (this limitation applies only for ISA controllers).
*/
while (TransferLength < *Length)
{
MdlPage1 = *MdlPagesPtr;
MdlPage2 = *(MdlPagesPtr + 1);
if (MdlPage1 + 1 != MdlPage2) break;
if (!HalpEisaDma && ((MdlPage1 ^ MdlPage2) & ~0xF)) break;
TransferLength += PAGE_SIZE;
MdlPagesPtr++;
}
if (TransferLength > *Length) TransferLength = *Length;
/*
* If we're about to simulate software S/G and not all the pages are
* physically contiguous then we must use the map registers to store
* the data and allow the whole transfer to proceed at once.
*/
if (((ULONG_PTR)MapRegisterBase & MAP_BASE_SW_SG) && (TransferLength < *Length))
{
UseMapRegisters = TRUE;
PhysicalAddress = RealMapRegisterBase->PhysicalAddress;
PhysicalAddress.QuadPart += ByteOffset;
TransferLength = *Length;
RealMapRegisterBase->Counter = MAXULONG;
Counter = 0;
}
else
{
/*
* This is ordinary DMA transfer, so just update the progress
* counters. These are used by IoFlushAdapterBuffers to track
* the transfer progress.
*/
UseMapRegisters = FALSE;
Counter = RealMapRegisterBase->Counter;
RealMapRegisterBase->Counter += BYTES_TO_PAGES(ByteOffset + TransferLength);
/*
* Check if the buffer doesn't exceed the highest physical address
* limit of the device. In that case we must use the map registers to
* store the data.
*/
HighestAcceptableAddress = HalpGetAdapterMaximumPhysicalAddress(AdapterObject);
if ((PhysicalAddress.QuadPart + TransferLength) > HighestAcceptableAddress.QuadPart)
{
UseMapRegisters = TRUE;
PhysicalAddress = RealMapRegisterBase[Counter].PhysicalAddress;
PhysicalAddress.QuadPart += ByteOffset;
if ((ULONG_PTR)MapRegisterBase & MAP_BASE_SW_SG)
{
RealMapRegisterBase->Counter = MAXULONG;
Counter = 0;
}
}
}
/*
* If we decided to use the map registers (see above) and we're about
* to transfer data to the device then copy the buffers into the map
* register memory.
*/
if ((UseMapRegisters) && (WriteToDevice))
{
HalpCopyBufferMap(Mdl,
RealMapRegisterBase + Counter,
CurrentVa,
TransferLength,
WriteToDevice);
}
/*
* Return the length of transfer that actually takes place.
*/
*Length = TransferLength;
/*
* If we're doing slave (system) DMA then program the (E)ISA controller
* to actually start the transfer.
*/
if ((AdapterObject) && !(AdapterObject->MasterDevice))
{
AdapterMode = AdapterObject->AdapterMode;
if (WriteToDevice)
{
AdapterMode.TransferType = WRITE_TRANSFER;
}
else
{
AdapterMode.TransferType = READ_TRANSFER;
if (AdapterObject->IgnoreCount)
{
RtlZeroMemory((PUCHAR)RealMapRegisterBase[Counter].VirtualAddress + ByteOffset,
TransferLength);
}
}
TransferOffset = PhysicalAddress.LowPart & 0xFFFF;
if (AdapterObject->Width16Bits)
{
TransferLength >>= 1;
TransferOffset >>= 1;
}
KeAcquireSpinLock(&AdapterObject->MasterAdapter->SpinLock, &OldIrql);
if (AdapterObject->AdapterNumber == 1)
{
PDMA1_CONTROL DmaControl1 = AdapterObject->AdapterBaseVa;
/* Reset Register */
WRITE_PORT_UCHAR(&DmaControl1->ClearBytePointer, 0);
/* Set the Mode */
WRITE_PORT_UCHAR(&DmaControl1->Mode, AdapterMode.Byte);
/* Set the Offset Register */
WRITE_PORT_UCHAR(&DmaControl1->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseAddress,
(UCHAR)(TransferOffset));
WRITE_PORT_UCHAR(&DmaControl1->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseAddress,
(UCHAR)(TransferOffset >> 8));
/* Set the Page Register */
WRITE_PORT_UCHAR(AdapterObject->PagePort + FIELD_OFFSET(EISA_CONTROL, DmaController1Pages),
(UCHAR)(PhysicalAddress.LowPart >> 16));
if (HalpEisaDma)
{
WRITE_PORT_UCHAR(AdapterObject->PagePort + FIELD_OFFSET(EISA_CONTROL, DmaController2Pages),
0);
}
/* Set the Length */
WRITE_PORT_UCHAR(&DmaControl1->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseCount,
(UCHAR)(TransferLength - 1));
WRITE_PORT_UCHAR(&DmaControl1->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseCount,
(UCHAR)((TransferLength - 1) >> 8));
/* Unmask the Channel */
WRITE_PORT_UCHAR(&DmaControl1->SingleMask, AdapterObject->ChannelNumber | DMA_CLEARMASK);
}
else
{
PDMA2_CONTROL DmaControl2 = AdapterObject->AdapterBaseVa;
/* Reset Register */
WRITE_PORT_UCHAR(&DmaControl2->ClearBytePointer, 0);
/* Set the Mode */
WRITE_PORT_UCHAR(&DmaControl2->Mode, AdapterMode.Byte);
/* Set the Offset Register */
WRITE_PORT_UCHAR(&DmaControl2->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseAddress,
(UCHAR)(TransferOffset));
WRITE_PORT_UCHAR(&DmaControl2->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseAddress,
(UCHAR)(TransferOffset >> 8));
/* Set the Page Register */
WRITE_PORT_UCHAR(AdapterObject->PagePort + FIELD_OFFSET(EISA_CONTROL, DmaController1Pages),
(UCHAR)(PhysicalAddress.u.LowPart >> 16));
if (HalpEisaDma)
{
WRITE_PORT_UCHAR(AdapterObject->PagePort + FIELD_OFFSET(EISA_CONTROL, DmaController2Pages),
0);
}
/* Set the Length */
WRITE_PORT_UCHAR(&DmaControl2->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseCount,
(UCHAR)(TransferLength - 1));
WRITE_PORT_UCHAR(&DmaControl2->DmaAddressCount[AdapterObject->ChannelNumber].DmaBaseCount,
(UCHAR)((TransferLength - 1) >> 8));
/* Unmask the Channel */
WRITE_PORT_UCHAR(&DmaControl2->SingleMask,
AdapterObject->ChannelNumber | DMA_CLEARMASK);
}
KeReleaseSpinLock(&AdapterObject->MasterAdapter->SpinLock, OldIrql);
}
/*
* Return physical address of the buffer with data that is used for the
* transfer. It can either point inside the Mdl that was passed by the
* caller or into the map registers if the Mdl buffer can't be used
* directly.
*/
return PhysicalAddress;
}
#endif
/**
* @name HalFlushCommonBuffer
*
* @implemented
*/
BOOLEAN
NTAPI
HalFlushCommonBuffer(IN PADAPTER_OBJECT AdapterObject,
IN ULONG Length,
IN PHYSICAL_ADDRESS LogicalAddress,
IN PVOID VirtualAddress)
{
/* Function always returns true */
return TRUE;
}
/*
* @implemented
*/
PVOID
NTAPI
HalAllocateCrashDumpRegisters(IN PADAPTER_OBJECT AdapterObject,
IN OUT PULONG NumberOfMapRegisters)
{
PADAPTER_OBJECT MasterAdapter = AdapterObject->MasterAdapter;
ULONG MapRegisterNumber;
/* Check if it needs map registers */
if (AdapterObject->NeedsMapRegisters)
{
/* Check if we have enough */
if (*NumberOfMapRegisters > AdapterObject->MapRegistersPerChannel)
{
/* We don't, fail */
AdapterObject->NumberOfMapRegisters = 0;
return NULL;
}
/* Try to find free map registers */
MapRegisterNumber = RtlFindClearBitsAndSet(MasterAdapter->MapRegisters,
*NumberOfMapRegisters,
0);
/* Check if nothing was found */
if (MapRegisterNumber == MAXULONG)
{
/* No free registers found, so use the base registers */
RtlSetBits(MasterAdapter->MapRegisters,
0,
*NumberOfMapRegisters);
MapRegisterNumber = 0;
}
/* Calculate the new base */
AdapterObject->MapRegisterBase =
(PROS_MAP_REGISTER_ENTRY)(MasterAdapter->MapRegisterBase +
MapRegisterNumber);
/* Check if scatter gather isn't supported */
if (!AdapterObject->ScatterGather)
{
/* Set the flag */
AdapterObject->MapRegisterBase =
(PROS_MAP_REGISTER_ENTRY)
((ULONG_PTR)AdapterObject->MapRegisterBase | MAP_BASE_SW_SG);
}
}
else
{
AdapterObject->MapRegisterBase = NULL;
AdapterObject->NumberOfMapRegisters = 0;
}
/* Return the base */
return AdapterObject->MapRegisterBase;
}
/* EOF */
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