c - Adding a driver to device path UEFI -


i trying add filter driver protocol in uefi, meaning consumes protocol, in hierarchy, pass through me.

i understand need add driver relevant device path - though no idea how. more that, how work handles connected device? (if understood correctly, need connect driver device using by_driver | exclusive, , once connect own driver device path , use connectcontroller driver handles, uefi should automatically connect supporting handles me).

i hoping if knows how add driver act filter driver (or in different semantic - layer driver?) specific protocol.

would really, really appreciate given help, since have not found anywhere else.

it's not complicated. thing need reinstall protocols wanna intercept.

let's take efi_pci_io_protocol example:

  1. collect pci device handles in handle database: locatehandlebuffer()
  2. get original pci io interface on each handle handleprotocol(), record somewhere may want call inside new protocol interface.
  3. reinstall pci io protocol gbs->reinstallprotocolinterface, disconnect device , replace old protocol interface new one.

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