64 bit PCI BAR

[Ron Rondis <ron.rondis@gmail.com>]

  Hi,

The following section, from PCI spec, explain the mechanism for getting 
64 bit region size.

"64-bit (memory) Base Address registers can be handled the same, except 
that the second
32-bit register is considered an extension of the first; i.e., bits 
32-63. Software writes
0FFFFFFFFh to both registers, reads them back, and combines the result 
into a 64-bit value.
Size calculation is done on the 64-bit value."

In pci/proce.c the implementation is:

read low bar
write ~0 to low bar
read low bar
write low bar

read high bar
write ~0 to high bar
read high bar
write high bar


Can someone explain the conflict between the spec and the implementation?


Please add me to CC.


Thanks,
Ron