legacypc.h File Reference

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Functions
NTSTATUS NTAPI	HalpLegacyPCCreateArbiter (_In_ PDEVICE_OBJECT BusFdo)
	Initialize the legacy PC arbiter that uses PIR for PIC IRQ assignments.
NTSTATUS NTAPI	HalpLegacyPCQueryArbInterface (_Out_writes_bytes_(Size) PVOID Interface, _In_ ULONG Size, _Out_ PULONG Length)
	Query the legacy PC Arbiter.

Function Documentation

HalpLegacyPCCreateArbiter()

NTSTATUS NTAPI HalpLegacyPCCreateArbiter

(

_In_ PDEVICE_OBJECT

BusFdo

)

Initialize the legacy PC arbiter that uses PIR for PIC IRQ assignments.

Parameters

[in]

BusFdo

Hal Bus FDO deviceobject

Definition at line 123 of file legacypcirqarb.c.

{
    NTSTATUS Status;
 
    PAGED_CODE();
 
    LegacyPCArbiter.UnpackRequirement = HalpLegacyPCArbUnpackRequirement;
    LegacyPCArbiter.PackResource = HalpLegacyPCArbPackResource;
    LegacyPCArbiter.UnpackResource = HalpLegacyPCArbUnpackResource;
    LegacyPCArbiter.ScoreRequirement = HalpLegacyPCArbScoreRequirement;
 
    /*
     * TODO: Later we'll override more when we implement PIR.
     * The most important piece for now here is the clamp.
     * This will let us boot for now, preserving orignal reactos behavior.
     * (Plug and Pray)
     */
 
    Status = ArbiterLibInitializeInstance(&LegacyPCArbiter,
                                          BusFdo,
                                          CmResourceTypeInterrupt,
                                          L"HalIRQ",
                                          L"Root",
                                          NULL);
    if (!NT_SUCCESS(Status))
    {
        return Status;
    }
 
    /* Lock to the 0-15 the PIR table only understands. */
    RtlAddRange(LegacyPCArbiter.Allocation, 16, ARBITER_MAXIMUM_ADDRESS, 0,
                RTL_RANGE_LIST_ADD_IF_CONFLICT, NULL, NULL);
    RtlAddRange(LegacyPCArbiter.Allocation, PIC_CASCADE_IRQ, PIC_CASCADE_IRQ,
                0, RTL_RANGE_LIST_ADD_IF_CONFLICT, NULL, NULL);
 
    return Status;
}

Referenced by HalpQueryInterface().

HalpLegacyPCQueryArbInterface()

NTSTATUS NTAPI HalpLegacyPCQueryArbInterface	(	_Out_writes_bytes_(Size) PVOID	Interface,
		_In_ ULONG	Size,
		_Out_ PULONG	Length
	)

Query the legacy PC Arbiter.

Parameters

[out]	Interface	Caller-supplied buffer that receives the ARBITER_INTERFACE.
[in]	Size	Size of the Interface buffer, in bytes.
[out]	Length	Receives sizeof(ARBITER_INTERFACE), whether or not the buffer was large enough.

Returns

STATUS_SUCCESS on success, or STATUS_BUFFER_TOO_SMALL if Size is smaller than sizeof(ARBITER_INTERFACE).

Definition at line 183 of file legacypcirqarb.c.

{
    PARBITER_INTERFACE ArbiterInterface = Interface;
 
    PAGED_CODE();
 
    *Length = sizeof(*ArbiterInterface);
    if (Size < sizeof(*ArbiterInterface))
        return STATUS_BUFFER_TOO_SMALL;
 
    ArbiterInterface->Size = sizeof(*ArbiterInterface);
    ArbiterInterface->Version = 1;
    ArbiterInterface->Context = &LegacyPCArbiter;
    ArbiterInterface->ArbiterHandler = ArbiterLibHandler;
    ArbiterInterface->Flags = 0;
 
    ArbiterInterface->InterfaceDereference = HalpLegacyPCArbDereference;
    ArbiterInterface->InterfaceReference = HalpLegacyPCArbReference;
 
    return STATUS_SUCCESS;
}

Referenced by HalpQueryInterface().