[OpenBIOS] Sparc32 progress

[Blue Swirl]

The checksum problem was caused by bad pointer arithmetic (difference of 
pointers to long is not equal to their byte difference).

Now also IOMMU and MMU mappings work. ESP is pretty close to working, we can 
really probe for the devices and get their properties, but READ_10 still 
returns zero data.

00000000-08000000
RAM 128 MB
forth started.
initializing memory...done
map_io: va 0xffdc4000 pa 0x10000000 off 0x0 npages 3
IOMMU: impl 0 vers 0 page table at 0xffda8000 of size 32768 bytes
Initializing SBus devices...
Initializing SCSI...map_io: va 0xffdc7000 pa 0x78400000 off 0x0 npages 1
dma1: Revision 0
map_io: va 0xffdc8000 pa 0x78800000 off 0x0 npages 1
done
Initializing SCSI devices...SCSI DRIVE @ffd70030:
id: 0
media: disk
model: QEMU HARDDISK
sectors: 23017
present: 1
bs: 512
SCSI DRIVE @ffd700a0:
id: 2
media: cdrom
model: QEMU CDROM
sectors: 0
present: 1
bs: 2048
done

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