This allows us to *Load boot26 at 0x8000 and then use *Go to run it.
This might be useful because we can't currently set the RISC OS filetype
for files on CDs, so they all end up being 0xffd (Data), and *RMLoad only
works for files of type 0xffa (Module), so we need some other way of loading
boot26.
be used to load a given physical page. At the moment, this just returns
the page's current logical mapping, but in future it might handle returning
bounce pages for physical pages which are in use, and copying to the correct
page just before loading the kernel.
matching names. This commit might include some private hacks that have been
lurking in my tree a while. They're all harmless, and this reduces the number
of gratuitous diffs I have to deal with.
