How to get PCI slot information from ACPI

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Hi, 

I need to get PCI slot info through ACPI using _SUN object. So I want to
know how to retrieve the slot info from _SUN object. Can you tell me how to
access the _SUN object? 

I have couple of questions related to that: 

1) Is there any signature in ROM for that object, so that we can map that
and read that structure? 

2) What is the structure of _SUN object and how to get the handle to that
structure? 

Thanks in advance



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