On Thu, 2015-02-05 at 11:34 +0000, Jan Beulich wrote: > >> @@ -140,6 +145,7 @@ acpi_status acpi_os_write_port(acpi_io_address port, > >> u32 value, u32 width) > >> > >> return AE_OK; > >> } > >> +#endif > > > > Why only x86? Linux seems to define it also for ARM64. > > What is a port on ARM?
I don't know how common it is now, but on older ARM systems it wasn't uncommon to reuse ISA type peripherals and the port space would be mapped to a specific hardcoded MMIO region. Even on modern h/w PCI host controllers have an MMIO region associated with the I/O ports of the PCI cards on the bus. All that said, I think it would be good to avoid doing anything with I/O ports without a specific requirement arising from some h/w or the spec, at least initially. Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
