[OpenBIOS] Sparc64 OpenBIOS

Nick Couchman Nick.Couchman at seakr.com
Wed Nov 18 23:27:16 CET 2009

>>> On 2009/11/18 at 14:44, Tarl Neustaedter <Tarl.Neustaedter at Sun.COM> wrote: 
> Mark Cave-Ayland wrote:
>> Mark Cave-Ayland wrote:
>>> Hmmm it looks to me as if the client interface seek word is expecting 
>>> the arguments in a different order - I would expect ihandle>phandle 
>>> to be executed on ffe4adc8, not on 0.
>> Referring to the IEEE-1275 spec, the arguments for seek are listed as:
>> IN: ihandle, pos.hi, pos.lo
>> whereas the comments in forth/system/ciface.fs say:
>> ( ihandle pos_hi pos_lo -- status )
>> Has OpenBIOS misinterpreted the spec, in that arguments in the OF spec 
>> should read top of the stack to bottom of the stack from left to 
>> right, rather than the other way around? Then again, if this were the 
>> case, would other OpenBIOS-based client interfaces not have discovered 
>> this before?
> That looks incorrect. The Client Interface part of the specification 
> shows the arguments in backwards order (c order :-) compared to the rest 
> of the specification. At the top of section 6.3.1, it states arguments 
> are specified in the order arg1, ... argn. This is backwards from normal 
> forth notation which is argn,... arg2, arg1. So it appears there is an 
> error in forth/systems/cifaces.fs. The corresponding code in Sun's OBP 
> (obp/os/bootprom/clientif.fth) shows:
> cif: seek    ( low,high ihandle -- status )

So, is this a change that needs to be made in the OpenBIOS forth code, in the Qemu code, or somewhere else??


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