[OpenBIOS] Re: [fb-d] Re: IO-APIC

James V Hendricks jimi at acl.lanl.gov
Thu Jun 29 18:43:19 CEST 2000 

>  It looks like chip select for the APIC is not enabled or is configured
> for another address.

Exactly.  Now we have another interesting problem.  Once we set the APIC
chip select enable, the second processor starts throwing a GPF at
set_mtrr_state in arch/i386/kernel/mtrr.c.  What can you do that will
throw a GPF?  I noticed the comment at the top of the function:

/*  [SUMMARY] Set the MTRR state for this CPU.
    <state> The MTRR state information to read.
    <ctxt> Some relevant CPU context.
    [NOTE] The CPU must already be in a safe state for MTRR changes.
    [RETURNS] 0 if no changes made, else a mask indication what was changed.
*/   

How do we get into a "safe state" for mtrr changes?

We read the MTR just fine, but when we write back to it the whole thing
just plain dies..

Thanks.
	- James

Here is the trace:

Linux version 2.4.0-test1 (jimi at snaresland) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #17 SMP Tue Jun 27 19:49:22 MDT 2000.
BIOS-provided physical RAM map:.
 e820: 000000000009f000 @ 0000000000000000 (usable).
 e820: 0000000003e00000 @ 0000000000100000 (usable).
Scan SMP from c0000000 for 1024 bytes..
found SMP MP-table at 00000000.
hm, page 00000000 reserved twice..
On node 0 totalpages: 16128.
zone(0): 4096 pages..
zone(1): 12032 pages..
zone(2): 0 pages..
Intel MultiProcessor Specification v1.4.
    Virtual Wire compatibility mode..
Default MP configuration #5.
Processor #0 Pentium(tm) Pro APIC version 16.
    Floating point unit present..
    Machine Exception supported..
    64 bit compare & exchange supported..
    Internal APIC present..
Processor #1 Pentium(tm) Pro APIC version 16.
    Floating point unit present..
    Machine Exception supported..
    64 bit compare & exchange supported..
    Internal APIC present..
Bus #0 is ISA   .
Bus #1 is PCI   .
I/O APIC #2 Version 16 at 0xFEC00000..
Int: type 0, pol 0, trig 0, bus 0, IRQ 00, APIC ID 2, APIC INT 02.
Int: type 0, pol 0, trig 0, bus 0, IRQ 01, APIC ID 2, APIC INT 01.
Int: type 0, pol 0, trig 0, bus 0, IRQ 03, APIC ID 2, APIC INT 03.
Int: type 0, pol 0, trig 0, bus 0, IRQ 04, APIC ID 2, APIC INT 04.
Int: type 0, pol 0, trig 0, bus 0, IRQ 05, APIC ID 2, APIC INT 05.
Int: type 0, pol 0, trig 0, bus 0, IRQ 06, APIC ID 2, APIC INT 06.
Int: type 0, pol 0, trig 0, bus 0, IRQ 07, APIC ID 2, APIC INT 07.
Int: type 0, pol 0, trig 0, bus 0, IRQ 08, APIC ID 2, APIC INT 08.
Int: type 0, pol 0, trig 0, bus 0, IRQ 09, APIC ID 2, APIC INT 09.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0a, APIC ID 2, APIC INT 0a.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0b, APIC ID 2, APIC INT 0b.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0c, APIC ID 2, APIC INT 0c.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0d, APIC ID 2, APIC INT 0d.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0e, APIC ID 2, APIC INT 0e.
Int: type 0, pol 0, trig 0, bus 0, IRQ 0f, APIC ID 2, APIC INT 0f.
Int: type 3, pol 0, trig 0, bus 0, IRQ 00, APIC ID 2, APIC INT 00.
Lint: type 3, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 00.
Lint: type 1, pol 0, trig 0, bus 0, IRQ 00, APIC ID ff, APIC LINT 01.
Processors: 2.
mapped APIC to ffffe000 (fee00000).
James: boot_cpu_id being set to 2016 from APIC_ID.
mapped IOAPIC to ffffd000 (fec00000).
Enabling extended fast FPU save and restore ... done..
Enabling KNI unmasked exception support ... done..
Kernel command line: root=/dev/hda1 ide0=reset.
Initializing CPU#0.
Detected 497438524 Hz processor..
unexpected IRQ trap at vector 31.
Calibrating delay loop... unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
992.87 BogoMIPS.
Memory: 61980k/64512k available (586k kernel code, 2144k reserved, 69k data, 156k init, 0k highmem).
Dentry-cache hash table entries: 8192 (order: 4, 65536 bytes).
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes).
Page-cache hash table entries: 16384 (order: 4, 65536 bytes).
kmem_create: Poisoning requested, but con given - bdev_cache.
Inode-cache hash table entries: 4096 (order: 3, 32768 bytes).
kmem_create: Poisoning requested, but con given - inode_cache.
CPU serial number disabled..
James: x86_vendor = 0.
James: edx = 64.
Checking 386/387 coupling... OK, FPU using exception 16 error reporting..
Checking 'hlt' instruction... unexpected IRQ trap at vector 31.
OK..
POSIX conformance testing by UNIFIX.
mtrr: v1.36 (20000221) Richard Gooch (rgooch at atnf.csiro.au).
CPU serial number disabled..
James: x86_vendor = 0.
James: edx = 64.
CPU0: Intel Pentium III (Katmai) stepping 03.
James: cpu_hz 497438524, cachesize 32, bandwidth 350, cacheflush_time 44377.
per-CPU timeslice cutoff: 89.28 usecs..
Getting VERSION: 40011.
Getting VERSION: 40011.
Getting LVT0: 700.
Getting LVT1: 400.
enabled ExtINT on CPU#0.
ESR value before enabling vector: 00000000.
ESR value after enabling vector: 00000000.
CPU present map: 3.
James: apicid 0, boot_cpu_id 1.
Booting processor 1/0 eip 2000.
Setting warm reset code and vector..
1..
2..
3..
Asserting INIT..
Waiting for send to finish....
+Deasserting INIT..
Waiting for send to finish....
+#startup loops: 2..
Sending STARTUP #1..
After apic_write..
Startup point 1..
Waiting for send to finish....
+Initializing CPU#1.
Sending STARTUP #2..
After apic_write..
Startup point 1..
CPU#1 (phys ID: 0) waiting for CALLOUT.
Waiting for send to finish....
+After Startup..
Before Callout 1..
After Callout 1..
CALLIN, before setup_local_APIC()..
masked ExtINT on CPU#1.
ESR value before enabling vector: 00000000.
ESR value after enabling vector: 00000000.
general protection fault: 0000.
CPU:    1.
EIP:    0010:[<c01a6dd1>].
EFLAGS: 00010087.
eax: 06050207   ebx: 07070707   ecx: 00000250   edx: 07070703.
esi: 00000002   edi: c01b1420   ebp: c01b1428   esp: c116df48.
ds: 0018   es: 0018   ss: 0018.
Process swapper (pid: 0, stackpage=c116d000).
Stack: 00000008 00000002 c01b1420 c116df98 00000000 00000000 00000021 00000000 .
       c01a6f4f c01b1428 c116df98 00000000 00000000 00000000 c01a73c2 c01b1420 .
       c116df98 c116df98 00000000 00000000 00000286 00000000 00000000 00000690 .
Call Trace: [<c0176460>] [<c016acb7>] [<c016acb7>] .
Code: 0f 30 c7 44 24 1c 01 00 unexpected IRQ trap at vector 31.
00 00 c7 44 24 14 00 00 00 00 8d 7d .
unexpected IRQ trap at vector 31.
Kernel panic: Attempted to kill the idle task!.
In idle task - not syncing.
APIC error interrupt on CPU#1, should never happen..
... APIC ESR0: 00000000.
... APIC ESR1: 00000040.
... bit 6: Received Illegal Vector..
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.
unexpected IRQ trap at vector 31.

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