Re: [Qemu-devel] Memory API: handling unassigned physical memory

[Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>]

On 01/05/12 07:57, Blue Swirl wrote:

>> Therefore I can't change it to my (modified) sbus_mmio_map() function
>> because it would break other non-SPARC platforms, and AIUI there is nothing
>> in the memory API that allows me to move a subregion to a different
>> MemoryRegion parent, even if I can get a reference to it with
>> sysbus_mmio_get_region() after the sysbus_mmio_map() call - or have I
>> misunderstood something?
>
> Sysbus is used as a generic class for motherboard devices, there is an
> assumption that there is no higher level bus. What we need here is a
> full blown bus. The translations and mappigs between bus addresses and
> motherboard addresses should be done in a Sysbus to SBus bridge
> device, just like PCI host bridges do.

Since SBus is mapped directly to physical addresses, is this mapping not 
just 1:1? Or does it make sense to re-work all the offsets of the 
various peripherals to be from the base address of the first slot?


ATB,

Mark.