memory: remove old_portio usage

These proposed patches aim at removing the .old_portio member of MemoryRegionOps structure, and replacing their usage by .read/.write handlers.

That way, faked I/O address space can be removed from architectures which don't have it (MIPS, PowerPC...), and commits like a178274efabcbbc5d44805b51def874e47051325 ("PPC: pseries: Remove hack for PIO window") can be reapplied.

The first 4 patches do the cleanup and remove the old_portio handler in MemoryRegion structure.
The last 4 patches are simplifications, now that Portio handlers can be called from memory core without limitation.

Changes since v1:
- handling of Portio has been moved to ioport.c (instead of isa-bus.c) This prevents creating an ISA bus on machines which don't have one
- added last 4 patches to see benefits of removing old_portio

Alexander Graf (1):
PPC: pseries: Remove hack for PIO window

Hervé Poussineau (7):
isa: fix documentation of isa_register_portio_list
memory: handle old_portio accesses in MMIO path
ioport: register memory regions for I/O port lists
memory: remove code dealing with old_portio
ioport: reimplement cpu_in/cpu_out using address_space_rw
ppc: simplify access to PReP I/O region
isa_mmio: simplify access to system I/O region

 hw/isa/isa_mmio.c           |   42 +++------
 hw/ppc/prep.c               |   65 ++-----------
 hw/ppc/spapr_pci.c          |   44 +--------
 include/exec/ioport.h       |    3 +-
 include/exec/memory.h       |    4 -
 include/hw/isa/isa.h        |    2 +-
 include/hw/pci-host/spapr.h |    2 +-
 ioport.c                    |  215 ++++++++++++++++++++++---------------------
 memory.c                    |   44 ---------
 9 files changed, 137 insertions(+), 284 deletions(-)

1.7.10.4