[OpenBIOS] input length

Artyom Tarasenko atar4qemu at googlemail.com
Sun Mar 28 01:16:30 CET 2010

2010/3/23 Tarl Neustaedter <Tarl.Neustaedter at sun.com>:
>> It looks like all the keywords are known to the OpenBIOS, but I can't
>> input the test string:
>> " /options" ['] find-device catch if 2drop true else current-device
>> device-end then swap l!
> The above executed at the command line will get you in trouble - it's
> expecting arguments on the stack you don't have.

Yes, thanks. Probably would have noticed stack underflow if I were
able to execute the command as-is.
My point was the limit of the command line length.

> " /options" ['] find-device catch
> This finds the "/options" node in the device tree and makes it the active
> device context. The top argument on the stack will tell you whether
> find-device caused a problem (aborted).
> if 2drop true else current-device device-end then
> The above says to drop two arguments from the stack (hopefully the string
> "/options") if find-device aborted, otherwise get the phandle of "/options"
> and put it on the stack. The device-end destroys the device context of
> /options. I'm not sure why this code does this, a simpler way would have
> been to simply call find-package, which doesn't set your device context in
> the first place.

Maybe the earlier versions of OBP didn't have find-package or it was buggy?

Artyom Tarasenko

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

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