cvs commit: src/sys/amd64/amd64 machdep.c

John Baldwin jhb at
Mon Nov 28 20:31:03 GMT 2005

On Monday 21 November 2005 01:39 pm, John Baldwin wrote:
> jhb         2005-11-21 18:39:17 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/amd64/amd64      machdep.c
>   Log:
>   Expand the hack to mask the atpics if 'device atpic' is not in the kernel
>   during boot up.  Now we do a full reset of the 8259As and setup a simple
>   interrupt handler (we actually borrow the apic one that just does an
>   immediate iret) to handle any spurious interrupts triggered by either
> chip. This should fix some folks that were getting a Trap 30 during bootup
> of certain SMP AMD systems.  This might get pushed into the 6.0 branch as
> an errata.  For now a suitable workaround is to add 'device atpic' to your
> kernel config.
>   Tested by:      scottl
>   Helpful info from:      dillon
>   MFC after:      1 week

Hmm, we probably still need to reprogram the ATPIC on resume as well.  I'm not 
sure it's actually worth not just compiling the atpic code in on amd64.

John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve"  =

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