ULONG NTAPI HalpSetPCIData	(	IN PBUS_HANDLER	BusHandler,
		IN PBUS_HANDLER	RootHandler,
		IN PCI_SLOT_NUMBER	Slot,
		IN PUCHAR	Buffer,
		IN ULONG	Offset,
		IN ULONG	Length
	)

Definition at line 409 of file pci.c.

Referenced by HalpAllocateAndInitPciBusHandler(), and HalSetBusDataByOffset().

{
    UCHAR PciBuffer[PCI_COMMON_HDR_LENGTH];
    PPCI_COMMON_CONFIG PciConfig = (PPCI_COMMON_CONFIG)PciBuffer;
    ULONG Len = 0;

    /* Normalize the length */
    if (Length > sizeof(PCI_COMMON_CONFIG)) Length = sizeof(PCI_COMMON_CONFIG);

    /* Check if this is a vendor-specific read */
    if (Offset >= PCI_COMMON_HDR_LENGTH)
    {
        /* Read the header */
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, sizeof(ULONG));

        /* Make sure the vendor is valid */
        if (PciConfig->VendorID == PCI_INVALID_VENDORID) return 0;
    }
    else
    {
        /* Read the entire header and validate the vendor ID */
        Len = PCI_COMMON_HDR_LENGTH;
        HalpReadPCIConfig(BusHandler, Slot, PciConfig, 0, Len);
        if (PciConfig->VendorID == PCI_INVALID_VENDORID) return 0;

        /* Return what's after the offset and normalize */
        Len -= Offset;
        if (Len > Length) Len = Length;

        /* Copy the specific caller data */
        RtlMoveMemory(PciBuffer + Offset, Buffer, Len);

        /* Write the actual configuration data */
        HalpWritePCIConfig(BusHandler, Slot, PciBuffer + Offset, Offset, Len);

        /* Update buffer and offset, decrement total length */
        Offset += Len;
        Buffer += Len;
        Length -= Len;
    }

    /* Now we still have something to copy */
    if (Length)
    {
        /* Check if it's vendor-specific data */
        if (Offset >= PCI_COMMON_HDR_LENGTH)
        {
            /* Read it now */
            HalpWritePCIConfig(BusHandler, Slot, Buffer, Offset, Length);
            Len += Length;
        }
    }

    /* Update the total length read */
    return Len;
}

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