[OpenBIOS] Solaris anyone?

[Blue Swirl]

On Mon, Jun 20, 2011 at 6:53 PM, Mark Cave-Ayland
<mark.cave-ayland at siriusit.co.uk> wrote:
> On 20/06/11 16:40, Bob Breuer wrote:
>
>>> +1 this is a fairly easy job - handcraft some assembly into C and then
>>> bind it into Forth. I'm happy to give you some pointers and help
>>> review the patch if you can write it (especially as I know some of the
>>> space* words are used in the SPARC64 loader too).
>>
>> Based off of
>> http://forums.oracle.com/forums/thread.jspa?threadID=1905000&tstart=90 ,
>> using the branch in a delay slot trick, here's a (untested) snippet of
>> inline assembly to start from:
>> __asm__("set 1f, %%g2\n\t"
>>           "sll %1, 2, %1\n\t"
>>           "jmp %1, %%g2, %%g0\n\t"
>>           " ba 2f\n"
>>           "1:\n\t"
>>           "lda [%2] 0, %0\n\t"
>>           "lda [%2] 4, %0\n\t"
>>            ...
>>           "2:\n"
>>           : "=r" (result)
>>           : "r" (asi), "r" (address)
>>           : "g2");
>>
>> I'm not that familiar with the OpenBIOS source tree layout, so where
>> would this best be placed?  How far to unroll the list of lda's?  I'm
>> not even sure if the asi's are 7 or 8 bit, and it looks like nothing
>> above 0x4c is defined for sparc32.  Maybe add some CPP magic to help
>> with unrolling the list.
>
> Hi Bob,
>
> As a starting point, take a quick look at arch/sparc64/lib.c. I'd create a
> space* function in a similar way to the itlb_load2/itlb_load3 functions and
> then in order to make the function visible to Forth as a word, add a
> bind_func() call within a suitable initialisation function. I'd suggest
> putting these both in arch/sparc32/lib.c as a starting point.
>
> You should also use ASI_ defines from include/arch/sparc32/asi.h in order to
> aid readability, and in fact it seems many more of them are defined within
> include/arch/sparc64/asi.h so you may be able to cut/paste from there.

No, Sparc64 ASIs are very different from Sparc32 ones.

On Sparc64 it's possible to use %asi register.