This patchset is the next set of changes required to boot MacOS on the q800
machine. The
main aim of these patches is to improve the Nubus support so that devices can
be plugged
into the Nubus from the command line i.e.
-device nubus-macfb[,romfile=decl.rom]
At the moment the only device that can be plugged into the Nubus is the macfb
framebuffer
however with these changes it is possible to take a ROM from a real Nubus card
and
attempt to use it in QEMU, and also allow for future interfaces such as virtio.
Patches 1 to 6 move the logic which manages bus addresses from the NubusDevice
into
the NubusBus itself, including the introduction of a bitmap to manage available
slots on the bus.
Patches 7 and 8 change the handling for unassigned (empty) slots to generate a
bus
fault and add trace events to allow logging of empty slot accesses during Nubus
enumeration.
Patches 9 to 11 remove the existing stubs for generating the format block (the
epilogue
of the Nubus device embedded ROM consisting of metadata and a checksum) and
replace them
with a romfile device property to allow the entire Nubus ROM to be loaded from
a file
into the ROM area, similar to a PCI option ROM.
Patch 12 moves the Nubus into its own separate address space whilst patches 13
to 17
update the NubusBridge (and MacNubusBridge) devices to allow machines to map the
required slots from the Nubus address space using sysbus_mmio_map().
Finally patches 18 to 20 add support for Nubus IRQs and wire them up
appropriately for
the q800 machine through VIA2, which is required for the next set of macfb
updates.