[OpenBIOS] PIC Passthough( VGA )

[Jd Lyons]

> On Dec 18, 2017, at 2:44 AM, Segher Boessenkool <segher at kernel.crashing.org> wrote:
> 
> On Mon, Dec 18, 2017 at 01:13:49AM -0500, Jd Lyons wrote:
>>> On Dec 18, 2017, at 12:48 AM, Segher Boessenkool <segher at kernel.crashing.org> wrote:
>>> On Mon, Dec 18, 2017 at 12:05:17AM -0500, Jd Lyons wrote:
>>>> Still bombing out at the same place:
>>> 
>>>> 401002a :  [ 0xe34 ]
>>>> 
>>>> byte-load: exception caught!
>>> 
>>> : xe33  $find invert IF ABORT THEN ;
>>> : xe34
>>>   " us" xe33 TO x9a7
>>>   " case-closed?" $find invert IF 2drop ['] 0 THEN
>>>   TO x9a8 ;
>>> 
>>> So the thing that throws is fcode e33, when trying to find the word "us".
>>> 
>>> (Btw, "invert" is weird here; I suppose it was coded as its synonym "not".
>>> In some other Forth systems "not" is a synonym for "0=", which makes more
>>> sense here.  Either works as long as $find returns a canonical true/false,
>>> as it supposed to).
>>> 
>>> So, implement "us", and you'll get further :-)  It's just like "ms", but
>>> microseconds, instead; so you could do
>>> 
>>> : us ( n -- )  d# 1000 / 1+ ms ;
>>> 
>>> (which waits way too long for short timeouts, of course).
>>> 
>> 
>> Ok, thanks, that makes since. I did see the “case-closed?” When I searched for 0xe34 in the detoked rom, but I wan’t sure what to make of it.
>> 
>> So, the “us” word is unimplemented in Openbios, and we need to add it to get past this part?
> 
> Exactly.  And I gave a (not super great) implementation above, enough to
> see if you get further :-)

Ok, I see, the code you gave was a command for Openbios, I kept trying to find where to add it to the source, thinking it was C code;-)

Only got one byte further:



       (offset) 5 
401000d : (compile)  [ 0xe05 ]
401000e : (compile) b(endcase) [ 0xc5 ]
401000f : (compile) over [ 0x48 ]
4010010 : (compile) b(to) [ 0xc3 ]
4010014 : (compile)  [ 0xe36 ]
4010016 : (compile) encode+ [ 0x112 ]
4010017 : (compile) 2dup [ 0x53 ]
4010018 : (compile) b(to) [ 0xc3 ]
401001b : (compile) b(to) [ 0xc3 ]
401001f : (compile)  [ 0xc7b ]
4010021 : (compile) property [ 0x110 ]
4010022 : (compile) b(;) [ 0xc2 ]
4010023 : b(') [ 0x11 ]
4010026 : b(to) [ 0xc3 ]
401002a :  [ 0xe34 ]
401002c :  [ 0xdff ]

byte-load: exception caught!
 ok
1 > 



> 
> 
> Segher

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