[OpenBIOS] PIC Passthough( VGA )
segher at kernel.crashing.org
Tue Dec 19 18:21:07 CET 2017
On Tue, Dec 19, 2017 at 11:20:57AM -0500, Jd Lyons wrote:
> > On Dec 19, 2017, at 10:56 AM, Segher Boessenkool <segher at kernel.crashing.org> wrote:
> > On Tue, Dec 19, 2017 at 10:40:08AM -0500, Jd Lyons wrote:
> >> Looks like the spot were I’m stuck is:
> >> b(;) ( 0x0c2 )
> >> 25612: b(') ( 0x011 ) (unnamed-fcode) [0xc84]
> >> 25613: b(to) ( 0x0c3 ) (unnamed-fcode) [0x9a9]
> >> 25614: (unnamed-fcode) [0xe34]
> >> 25615: (unnamed-fcode) [0xdff]
> >> 25616: (unnamed-fcode) [0x93d]
> >> 25617: b(lit) ( 0x010 ) 0xf
> >> 25618: <> ( 0x03d )
> >> 25619: b?branch ( 0x014 ) 0x0026 ( =dec 38)
> >> 25620: (unnamed-fcode) [0x9bd]
> >> 25621: b(lit) ( 0x010 ) 0xff
> >> 25622: and ( 0x023 )
> >> 25623: my-space ( 0x103 )
> >> 25624: + ( 0x01e )
> >> 25625: (unnamed-fcode) [0xa08]
> >> 25626: b(lit) ( 0x010 ) 0x6
> >> 25627: and ( 0x023 )
> >> 25628: b(lit) ( 0x010 ) 0x4
> >> 25629: = ( 0x03c )
> >> 25630: b?branch ( 0x014 ) 0x0009 ()
> >> 25631: b(') ( 0x011 ) (unnamed-fcode) [0x9c1]
> >> 25632: b(to) ( 0x0c3 ) (unnamed-fcode) [0x9c0]
> >> 25633: b(>resolve) ( 0x0b2 )
> >> 25634: b(>resolve) ( 0x0b2 )
> >> It seems to break right here……………………………….
> > Those b?branch are in interpret mode, I don't know if that is handled
> > correctly (it is tricky to get right).
> So, is it hanging at b(>resolve) ( 0x0b2 ) or (unnamed-fcode) [0xddf] ?
> Do we need to work on how Openbios handles b?branch?
That is my suspicion yes.
\ b?branch ( continue? -- )
\ Conditional branch FCode. Followed by FCode-offset.
fcode-offset 0< if \ if we jump backwards, we can forsee where it goes
['] do?branch ,
setup-tmp-comp ['] do?branch ,
This is not compliant; it should behave differently in interpretation
state (just skip stuff). This matters if e.g. the stuff inside the "if"
does not compile properly, etc. (it can be used to implement "[if]").
> Is there anyway to make detok be less verbose, and just print the raw Forth?
It's a simple matter of coding ;-)
The thing is, those words do not have names in the compiled FCode. The
things I detokenised by hand I gave names like "xddf" which is friendlier;
but your program might actually have names like that, too...
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