Accessing PCI Configuration Space
An adapter driver can access its adapter card's PCI configuration space at IRQL PASSIVE_LEVEL by using the IRP_MN_READ_CONFIG and IRP_MN_WRITE_CONFIG requests.
In Windows 2000 and later, PCI driver stacks export the BUS_INTERFACE_STANDARD interface, which provides access to the PCI configuration space at IRQL DISPATCH_LEVEL.
For more information, see Accessing Device Configuration Space.
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