105a37cac7
-pci_get_class : This function search for a matching pci device based on
the class/subclass and returns a newly created pci_dev.
- pci_{save,restore}_state : This is analogous to ours with the same name
- pci_is_root_bus : Return true if this is the root bus
- pci_get_domain_bus_and_slot : This function search for a matching pci
device based on domain, bus and slot/function concat into a single
unsigned int (devfn) and returns a newly created pci_dev
- pci_bus_{read,write}_config* : Read/Write to the config space.
While here add some helper function to alloc and fill the pci_dev struct.
Reviewed by: hselasky, bz (older version)
Differential Revision: https://reviews.freebsd.org/D27550
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