Ryan Bradetich wrote:
>
> Paul,
>
> I have started working on getting the kernel to boot on the PA2.0
> architecture again, and I see the you and others have been doing
> lots of work with the initialization code. (Nice job to everyone btw,
> the code is a lot easier to figure out for a newbie like me! :)
>
> I was looking at the following section of code and I have a
> discrepancy that I wanted to make you aware of. I don't know how
> to fix it yet, but I will continue to look.
>
> I am working on a C200+ which has the PA2.0 processor, so in the
> the following section of code it should give me an error during the
> BTLB initialization, but during the PDC_BTLB_INSERT pret is set
> to 0, so the check for non-PA1.1 architecture's fail.
>
> I will continue to look through the documentation that has been
> previously pointed out, and the devresource page pointed out by
> Frank Rowand to see if I can find a solution to the problem.
>
> Thanks,
>
> Ryan Bradetich
>
> [Taken from arch/parisc/kernel/realmode_setup.c]
>
> /* This whole VM setup stuff may be removed ultimately. It seems
> * to me that once the TLB miss handlers are ready, we just switch
> * to VM and let them handle TLB population -PB
> */
>
> pret = (*PAGE0->mem_pdc)(
> PDC_BLOCK_TLB,
> PDC_BTLB_INSERT,
> 0x00000000, /* MS bits, virt page number */
> 0xc0000, /* LS bits, virt page number */
> 0x00000000, /* Physical page number */
> 4096, /* # pages to map */
> 0x03000000, /* access rights, etc... */
> 0); /* slot number */
>
> if (pret != 0)
> {
> mprintf("PDC_BTLB_INSERT returned %d\n", pret);
> if (pret == -1)
> {
> mprintf("Looks like there's no BTLB on this box, so it's
> probably\n"
> "either PA1.0 or PA2.0. In any case we're
> screwed for now\n");
> led_flash();
> }
> }
Ryan,
This might not solve your problem, but it's worth checking out. The
procedure calling convention for PA 2.0 PDC is different than for 1.0.
See http://thepuffingroup.com/parisc/documentation.html, pdc.pdf,
p 2-8 defines the return status as a 64-bit, not 32 bit. You might
also want to look at the neighboring pages of the document for other
changes (eg, arg4 through arg7 are passed in registers).
I don't know if your system has wide or narrow PDC - you have to call
PDC_MODEL(Return Capabilities), and check bit 63 of caps (the field
called OS64).
-Frank