[OpenBIOS] Sparc64 OpenBIOS

Tarl Neustaedter Tarl.Neustaedter at Sun.COM
Wed Nov 18 22:44:04 CET 2009

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 )

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