19265b4bb9
kernels, and use them in the bus_space(9) implementation instead of ugly Xen #ifdef-age. In a non-Xen kernel, the _ma() functions either call or alias the equivalent _pa() functions. Reviewed on port-xen@netbsd.org and port-i386@netbsd.org. Passes rmind@'s and bouyer@'s inspection. Tested on i386 and on Xen DOMU / DOM0.