Date: Wed, 5 Jan 2000 03:35:48 -0500 (EST) From: Luoqi Chen <luoqi@watermarkgroup.com> To: aron@cs.rice.edu, freebsd-hackers@FreeBSD.ORG Subject: Re: FreeBSD-4.0 on SMP Message-ID: <200001050835.DAA26364@lor.watermarkgroup.com>
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> Hi,
> I have a 4-processor machine but I want to configure FreeBSD-4.0
> to only use 1 of the processors for some tests. In addition I want the
> local APIC to be enabled. It seems currently that the APIC is only enabled
> when the kernel is compiled with the SMP option. However, when I specify
> NCPU to be 1, the kernel panics. So the question is - is there a way to
> just use one processor and still keep the APIC enabled ?
>
>
>
> - Mohit
>
Try again with the following patch,
Index: i386/mp_machdep.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/i386/mp_machdep.c,v
retrieving revision 1.112
diff -u -r1.112 mp_machdep.c
--- i386/mp_machdep.c 1999/11/27 12:32:20 1.112
+++ i386/mp_machdep.c 2000/01/05 08:28:40
@@ -1097,7 +1097,7 @@
processor_entry(proc_entry_ptr entry, int cpu)
{
/* check for usability */
- if ((cpu >= NCPU) || !(entry->cpu_flags & PROCENTRY_FLAG_EN))
+ if (!(entry->cpu_flags & PROCENTRY_FLAG_EN))
return 0;
/* check for BSP flag */
@@ -1109,11 +1109,13 @@
}
/* add another AP to list, if less than max number of CPUs */
- else {
+ else if (cpu < NCPU) {
CPU_TO_ID(cpu) = entry->apic_id;
ID_TO_CPU(entry->apic_id) = cpu;
return 1;
}
+
+ return 0;
}
Index: include/mpapic.h
===================================================================
RCS file: /home/ncvs/src/sys/i386/include/mpapic.h,v
retrieving revision 1.12
diff -u -r1.12 mpapic.h
--- include/mpapic.h 1999/08/28 00:44:19 1.12
+++ include/mpapic.h 2000/01/05 08:24:58
@@ -98,6 +98,8 @@
static __inline int
all_but_self_ipi(int vector)
{
+ if (mp_ncpus <= 1)
+ return 0;
return apic_ipi(APIC_DEST_ALLESELF, vector, APIC_DELMODE_FIXED);
}
-lq
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