[OpenBIOS] sun4u interrupt-map

Artyom Tarasenko atar4qemu at gmail.com
Thu Apr 5 23:37:45 CEST 2012

On Thu, Apr 5, 2012 at 12:37 AM, Tarl Neustaedter <tarl-b2 at tarl.net> wrote:
> On 2012-Apr-4 18:15 , Artyom Tarasenko wrote:
>>> >  Evidently on the Ultra-5, we aren't using three cells to identify the
>>> > child,
>>> >  only two. So we probably skip child.mid in both of the above
>>> > specifications.
>> And what are child.hi and child.lo? Is it the physical address, stored
>> in the reg property?
> Yes. It's bus-binding specific. I don't remember what the parent bus of the
> PCI node was on an Ultra-5, but presumably <3c,0> indicates the PCI root
> complex. It should be from the reg property of that same PCI node.
>> But then the filter (address&   0x3e) == 0x3c can potentially hit
>> really a lot of devices?
> In this case, the mask of 0x3e (0011.1110) presumably indicates there are
> only five meaningful bits in the child address that should be used for
> comparison. Interestingly, by having a zero in the intrspec field,
> presumably it only allows one interrupt (zero) to be mapped in this case.

I gave the following shot:

0 > show-devs
ffe1a2b0 /
( ... )
ffe29140 /pci at 1fe,0 (pci)
ffe299a8 /pci at 1fe,0/pci at 1 (pci)
ffe2a060 /pci at 1fe,0/pci at 1,1 (pci)
ffe2aeb8 /pci at 1fe,0/ebus at 3
ffe2bb00 /pci at 1fe,0/ebus at 3/su at 0,1 (serial)
( ... )

cd /pci at 1fe,0/ebus
000001fe encode-int 020003f8 encode-int encode+ 1 encode-int encode+
ffe29140 encode-int encode+ 2b encode-int encode+ " interrupt-map" property

0000001f encode-int 00ffffff encode-int encode+ 00000003 encode-int encode+
" interrupt-map-mask" property

cd /pci at 1fe,0/ebus at 3/su
1 encode-int " interrupts" property

And Linux's of_device_64 interprets it the following way:

/pci at 1f,0: direct translate 7f0 --> 1
/pci at 1f,0: direct translate 7ee --> 1
/pci at 1f,0: direct translate 7ef --> 1
/pci at 1f,0: direct translate 7e5 --> 1

^^^^^ This is strange but is the same regardless my interrupt-map try above.

/pci at 1f,0/ebus at 3/su at 1fe,20003f8: Apply [/pci at 1f,0/ebus at 3:1] imap --> [NULL:1]

^^^^^ Have I done something wrong, or more interrupt mappings  is needed?

Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/search/label/qemu

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