arbdma.c File Reference

#include <ntoskrnl.h>
#include <debug.h>

Include dependency graph for arbdma.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Functions
NTSTATUS NTAPI	IopArbDmaUnpackRequirements (_In_ PIO_RESOURCE_DESCRIPTOR IoDescriptor, _Out_ PUINT64 OutMinimumAddress, _Out_ PUINT64 OutMaximumAddress, _Out_ PUINT64 OutLength, _Out_ PUINT64 OutAlignment)
NTSTATUS NTAPI	IopArbDmaPackResource (_In_ PIO_RESOURCE_DESCRIPTOR IoDescriptor, _In_ UINT64 Start, _Out_ PCM_PARTIAL_RESOURCE_DESCRIPTOR CmDescriptor)
NTSTATUS NTAPI	IopArbDmaUnpackResource (_In_ PCM_PARTIAL_RESOURCE_DESCRIPTOR CmDescriptor, _Out_ PUINT64 Start, _Out_ PUINT64 OutLength)
INT32 NTAPI	IopArbDmaScoreRequirement (_In_ PIO_RESOURCE_DESCRIPTOR IoDescriptor)
NTSTATUS NTAPI	IopArbDmaInitialize (VOID)
	Initialize the RootDmaArbiter.

Variables
ARBITER_INSTANCE	IopRootDmaArbiter

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 11 of file arbdma.c.

Function Documentation

IopArbDmaInitialize()

NTSTATUS NTAPI IopArbDmaInitialize

(

VOID

)

Initialize the RootDmaArbiter.

Returns

NTSTATUS

Return values

STATUS_SUCCESS
STATUS_UNSUCCESSFUL
STATUS_INSUFFICIENT_RESOURCES

Definition at line 106 of file arbdma.c.

{
    NTSTATUS Status = STATUS_UNSUCCESSFUL;
 
    PAGED_CODE();
    IopRootDmaArbiter.Name = L"RootDma";
    IopRootDmaArbiter.UnpackRequirement = IopArbDmaUnpackRequirements;
    IopRootDmaArbiter.PackResource = IopArbDmaPackResource;
    IopRootDmaArbiter.UnpackResource = IopArbDmaUnpackResource;
    IopRootDmaArbiter.ScoreRequirement = IopArbDmaScoreRequirement;
 
    Status = ArbiterLibInitializeInstance(&IopRootDmaArbiter,
                                          NULL,
                                          CmResourceTypeDma,
                                          IopRootDmaArbiter.Name,
                                          L"Root",
                                          NULL);
    if (!NT_SUCCESS(Status))
    {
        DPRINT1("IopArbDmaInitialize: Failed with %X", Status);
    }
 
    return Status;
}

Referenced by IopInitializeArbiters().

IopArbDmaPackResource()

NTSTATUS NTAPI IopArbDmaPackResource	(	_In_ PIO_RESOURCE_DESCRIPTOR	IoDescriptor,
		_In_ UINT64	Start,
		_Out_ PCM_PARTIAL_RESOURCE_DESCRIPTOR	CmDescriptor
	)

Definition at line 41 of file arbdma.c.

{
    PAGED_CODE();
 
    CmDescriptor->Type = CmResourceTypeDma;
    CmDescriptor->ShareDisposition = IoDescriptor->ShareDisposition;
    CmDescriptor->Flags = IoDescriptor->Flags;
 
    /*
     * TODO: this is only version gated temporarily,
     * we need this for USB3 eventually, I marked it for now.
     */
#if (NTDDI_VERSION >= NTDDI_WIN8)
    if (IoDescriptor->Flags & CM_RESOURCE_DMA_V3)
    {
        CmDescriptor->u.DmaV3.Channel       = IoDescriptor->u.DmaV3.Channel;
        CmDescriptor->u.DmaV3.RequestLine   = IoDescriptor->u.DmaV3.RequestLine;
        CmDescriptor->u.DmaV3.TransferWidth = (UCHAR)IoDescriptor->u.DmaV3.TransferWidth;
        return STATUS_SUCCESS;
    }
#endif
 
    CmDescriptor->u.Dma.Channel = (ULONG)Start;
    CmDescriptor->u.Dma.Port    = 0;
 
    return STATUS_SUCCESS;
}

Referenced by IopArbDmaInitialize().

IopArbDmaScoreRequirement()

INT32 NTAPI IopArbDmaScoreRequirement

(

_In_ PIO_RESOURCE_DESCRIPTOR

IoDescriptor

)

Definition at line 89 of file arbdma.c.

{
    PAGED_CODE();
    return (INT32)(IoDescriptor->u.Dma.MaximumChannel - IoDescriptor->u.Dma.MinimumChannel);
}

Referenced by IopArbDmaInitialize().

IopArbDmaUnpackRequirements()

NTSTATUS NTAPI IopArbDmaUnpackRequirements	(	_In_ PIO_RESOURCE_DESCRIPTOR	IoDescriptor,
		_Out_ PUINT64	OutMinimumAddress,
		_Out_ PUINT64	OutMaximumAddress,
		_Out_ PUINT64	OutLength,
		_Out_ PUINT64	OutAlignment
	)

Definition at line 22 of file arbdma.c.

{
    PAGED_CODE();
 
    *OutMinimumAddress = IoDescriptor->u.Dma.MinimumChannel;
    *OutMaximumAddress = IoDescriptor->u.Dma.MaximumChannel;
    *OutLength    = 1;
    *OutAlignment = 1;
 
    return STATUS_SUCCESS;
}

Referenced by IopArbDmaInitialize().

IopArbDmaUnpackResource()

NTSTATUS NTAPI IopArbDmaUnpackResource	(	_In_ PCM_PARTIAL_RESOURCE_DESCRIPTOR	CmDescriptor,
		_Out_ PUINT64	Start,
		_Out_ PUINT64	OutLength
	)

Definition at line 74 of file arbdma.c.

{
    PAGED_CODE();
 
    *Start = CmDescriptor->u.Dma.Channel;
    *OutLength = 1;
 
    return STATUS_SUCCESS;
}

Referenced by IopArbDmaInitialize().

Variable Documentation

IopRootDmaArbiter

ARBITER_INSTANCE IopRootDmaArbiter

extern

Definition at line 25 of file pnpinit.c.

Referenced by IopArbDmaInitialize().