Add bus_space_barrier code to powerpc bus.h. This portion of the bus interface was not previously implemented. This functionality is required for the latest USB changes. The bus_space_barrier does not perform any operation with this change, it expects that the device mappings will be performed with the Guard bit set which then should not require this forced sync.
Add bus_space_barrier code to powerpc bus.h. This portion of the
bus interface was not previously implemented. This functionality is
required for the latest USB changes.
The bus_space_barrier does not perform any operation with this change,
it expects that the device mappings will be performed with the Guard
bit set which then should not require this forced sync.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars