Date: Wed, 26 Mar 97 05:59:53 -0500 From: cr@jcmax.com (Cyrus Rahman) To: smp@freebsd.org Subject: APIC_IO and the fpu Message-ID: <9703261059.AA21640@corona.jcmax.com>
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>> >It looks to me that the problem with the fpu stuff might be more a
>> >function of FPU error handling (irq13 vs. IDT trap #16) rather than just
>> >plain floating point operations...
>>
>> I agree, and think that someone could find it by examining what goes on
>> in i386/isa/npx.c:mpxintr().
>
>A further thought, its possible that it could be APIC_IO related, could
>someone run this program on both an APIC_IO and non APIC_IO kernel
>to see if it locks both (I don't have an SMP machine anymore)?
>
>> ========================================================================
>> #include <sys/types.h>
>> #include <signal.h>
>> void blech() { exit(3); }
>> main()
>> {
>> int i32;
>> double f;
>> int result = 0;
>> signal(SIGFPE, blech);
>>
>> f = (double) 0x7fffffff;
>> f = 10 * f;
>> i32 = (int) f;
>>
>> if (i32 != (int) f)
>> result |= 1;
>> exit(result);
>> }
>> ========================================================================
>
>--
>Steve Passe | powered by
>smp@csn.net | FreeBSD
The code runs fine with APIC_IO off, but locks the machine up quite nicely
with it on. I'm not sure what causes the problem yet...
Cyrus
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