[parisc-linux] Re: [parisc-linux-cvs] linux carlos

[Joel Soete]

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>
>no.
>IIRC instructions for purging the cache are broadcast to other CPUs.
>
That is the first thing I would like to check (as the first signal I notice
is a itlb miss fault and the piminfo of the 2d cpu seems to show a crash
on a branch instruction [cmpb iirc], I presume that during the init of the
second cpu this last tries to access a page which was just purged by the
first.  This is also why I would like to find the psw of this second cpu
in the mentionned pimfinfo :) )

>> But to avoid usage of cache would it be possible to access global kernel's
>> variable with absolute addressing mode? Is it feasible?
>
>Since the caches use virtual indices, it would make sense when using
>physically addresses to bypass the cache. But I don't know if that's
>really the case or not. I would expect that described in the PA2.0 Arch
>book.

I don't yet browse all the book but at a first glance ldda and stda are available
(respectively load and store doubleword absolute)...

>> btw scaning cod
>>  related to SMP I find in smp.c a very draft of
>> an 'ipi_init()' but unfortunately 'Ignore for now.  *May* need this
>> "hook" to register IPI handler'..., interesting isn't it :).
>
>I wrote that. ipi_init and comments can be deleted.
>I haven't see a need for ipi_init(). When I originally
>implemented the SMP support I thought it might be.
>
>The IPI handler is statically "hooked" (aka registered) in
>	arch/parisc/kernel/irq.c:cpu_irq_actions[]
>
>See ipi_interrupt() for IPI implementation.
>
Allright (clear)
>>
>> Is there any other platform inplementing such stuff (I try to scan 2.4
src
>> but not found anywhere else) or some reference on to implement it?
>
>it == ?
>IPI is implemented.

I continue so.

BTW here is a small 2.6 back port that may be you could co safely:
--- processor.c.orig	2003-08-28 18:04:57.000000000 +0200
+++ processor.c	2003-08-28 18:08:37.000000000 +0200
@@ -370,9 +370,9 @@
 };
 
 static struct parisc_driver cpu_driver = {
-	name:		"CPU",
-	id_table:	processor_tbl,
-	probe:		processor_probe
+	.name		= "CPU",
+	.id_table	= processor_tbl,
+	.probe		= pprocessor_probe
 };
 
 /**


Many thanks again for your attention,
    Joel



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