Date: Sun, 12 Dec 1999 20:11:45 +0900 From: NOKUBI Hirotaka <hnokubi@yyy.or.jp> To: freebsd-smp@freebsd.org Subject: IRQ and APIC pin mapping question Message-ID: <19991212111015.2B2CF150CD@hub.freebsd.org>
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Hello.
I've been trying SMP kernel on NEC PC9821RvII which is not PC-AT
compatible, FreeBSD PC98 port works fine on it with UP kernel.
I made it possible to access MPCT at the top of the physical memory,
SMP kernel works fine on it. But there is a problem around interrupt.
Would you advice me about that?
Almost all MPCT I've seen has same source IRQ# and destination
APIC PIN#, like IRQ4 is connected to APIC PIN4. But PC9821RvII's
MPCT shows some IRQ# is connected to different APIC PIN#, like
IRQ8 is connected to APIC PIN7 (please see mptable output).
My question is the meaning of int_to_apicintpin[].
Interrupt is managed with IRQ#, so it needs to know that which IRQ#
corresponds to which APIC PIN#. Although I think that is the reason
int_to_apicintpin[] is provided, initialization of it confused me.
Function setup_apic_irq_mapping() initialize int_to_apicintpin[] using
assign_apic_irq() with same value as argument `intpin' and `irq'
(please see patch). It works fine on the machine which has same
IRQ# and APIC PIN#. But on my PC9821RvII, it is impossible for kernel
to get correct APIC PIN# corresponds to IRQ# to handle. For example,
kernel wants to disable IRQ10, APIC PIN9 should be disabled,
but without patch, kernel disables APIC PIN10.
How can I fix this problem without affecting PC-AT compatible?
----
NOKUBI Hirotaka
Fingerprint20 = DEBC 0793 7CD6 92F1 0A1F A792 9E2F EEEE A41B 171D
===============================================================================
MPTable, version 2.0.15
-------------------------------------------------------------------------------
MP Floating Pointer Structure:
location: BIOS
physical address: 0x000f50f0
signature: '_MP_'
length: 16 bytes
version: 1.4
checksum: 0xa1
mode: Virtual Wire
-------------------------------------------------------------------------------
MP Config Table Header:
physical address: 0x05fff704
signature: 'PCMP'
base table length: 252
version: 1.4
checksum: 0x47
OEM ID: 'NEC '
Product ID: 'T63M0.06 '
OEM table pointer: 0x00000000
OEM table size: 0
entry count: 23
local APIC address: 0xfee00000
extended table length: 0
extended table checksum: 0
-------------------------------------------------------------------------------
MP Config Base Table Entries:
--
Processors: APIC ID Version State Family Model Step Flags
0 0x11 BSP, usable 6 3 3 0x0381
1 0x11 AP, usable 6 3 4 0x0381
--
Bus: Bus ID Type
0 NEC98
1 PCI
--
I/O APICs: APIC ID Version State Address
2 0x11 usable 0xfec00000
--
I/O Ints: Type Polarity Trigger Bus ID IRQ APIC ID PIN#
INT active-hi edge 0 0 2 0
INT active-hi edge 0 1 2 1
INT active-hi edge 0 2 2 2
INT active-hi level 0 3 2 3
INT active-hi edge 0 4 2 4
INT active-hi edge 0 5 2 5
INT active-hi edge 0 6 2 6
INT active-hi edge 0 8 2 7
INT active-hi edge 0 9 2 8
INT active-hi level 0 10 2 9
INT active-hi edge 0 11 2 10
INT active-hi edge 0 12 2 11
INT active-hi edge 0 13 2 12
INT active-hi edge 0 14 2 13
INT active-hi edge 0 15 2 14
ExtINT active-hi edge 0 0 2 15
--
Local Ints: Type Polarity Trigger Bus ID IRQ APIC ID PIN#
ExtINT active-hi edge 0 0 0 0
NMI active-hi edge 0 1 0 1
-------------------------------------------------------------------------------
# SMP kernel config file options:
# Required:
options SMP # Symmetric MultiProcessor Kernel
options APIC_IO # Symmetric (APIC) I/O
# Optional (built-in defaults will work in most cases):
#options NCPU=2 # number of CPUs
#options NBUS=2 # number of busses
#options NAPIC=1 # number of IO APICs
#options NINTR=24 # number of INTs
===============================================================================
Index: i386/i386/mp_machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/mp_machdep.c,v
retrieving revision 1.111
diff -u -u -r1.111 mp_machdep.c
--- mp_machdep.c 1999/10/15 21:38:15 1.111
+++ mp_machdep.c 1999/12/12 10:59:25
@@ -966,7 +966,7 @@
int x;
if (int_to_apicintpin[irq].ioapic != -1)
- panic("assign_apic_irq: inconsistent table");
+ return;
int_to_apicintpin[irq].ioapic = apic;
int_to_apicintpin[irq].int_pin = intpin;
@@ -1070,7 +1070,7 @@
io_apic_ints[x].int_type == 3)) {
assign_apic_irq(0,
io_apic_ints[x].dst_apic_int,
- io_apic_ints[x].dst_apic_int);
+ io_apic_ints[x].src_bus_irq);
}
}
int_vector = 0;
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