- The boundary argument to bus_space_alloc() should be a bus_size_t, not
a bus_addr_t.
- The buffer arguments in the "multiple write" methods should have
const qualifiers.
And one from me:
- Make bus_space_barrier() eat up the arguments passed to it so that
the compiler doesn't needlessly whine.
- No more distinction between i/o-mapped and memory-mapped
devices. It's all "bus space" now, and space tags
differentiate the space with finer grain than the
bus chipset tag.
- Add memory barrier methods.
- Implement space alloc/free methods.
- Implement region read/write methods (like memcpy to/from
bus space).
This interface provides a better abstraction for dealing with
machine-independent chipset drivers.
- A fixed extent map (statically allocated descriptor storage) is
created in init386(), just before the call to consinit(). The
fixed descriptor storage has enough room for 8 region entires,
which is plenty for early initialization, but doesn't chew up
that much memory.
This extent map (ioport_ex) manages the i386 i/o port
space (0x0 - 0xffff).
- Just before the call to configure() in cpu_startup(), a
flag is set which notifies the bus_io functions that it is
safe to use malloc() to allocate descriptor storage, in the
event that more than 8 regions are needed.
- bus_io_map() attempts to allocate the specified region from
ioport_ex. If the allocation succeeds, the io handle is
filled in. If the allocation fails, it is implied that
something else is already using that io space, and an
error condition is returned.
- bus_io_unmap() frees a region previously allocated from
ioport_ex in bus_io_map(). If the free fails, a warning
is printed on the conole.
These changes implement "port accounting". This is required for
proper autoconfiguration on the i386 port, and makes dealing with,
among other things, PCMCIA io mappings _much_ easier.
machine-independent code for more sane access to bus resources.
New functions will be added to this set, in the future, as appropriate,
but this is a good starting set. Defines:
bus_{io,mem}_{map,unmap}
bus_{io,mem}_{read,write}_{1,2,4,8}
functions, and several types to go with them.
thorpej