thorpej
Sun Jun 23 12:59:11 PDT 1996
Update of /a/cvsroot/src/sys/arch/i386/include
In directory pain.lcs.mit.edu:/a/tmp/cvs-serv3265/include

Modified Files:
	bus.h 
Log Message:
New implementation of bus_io_{,un}map() for the i386.  Details:

	- 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.


thorpej
Sun Jun 23 12:59:23 PDT 1996
Update of /a/cvsroot/src/sys/arch/i386/i386
In directory pain.lcs.mit.edu:/a/tmp/cvs-serv3265/i386

Modified Files:
	machdep.c 
Log Message:
New implementation of bus_io_{,un}map() for the i386.  Details:

	- 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.