=> R3 = 0 to start enumeration
or last value from PCI_EnumerateFunctions
<= R0 = vendor ID (bits 0-15)
device ID (bits 16-31)
R1 = subsystem vendor ID (bits 0-15)
subsystem ID (bits 16-31)
R2 = class code
R3 = function handle
This SWI iteratively reads through each of the PCI devices on each call, until an error is returned.
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