Date: Wed, 05 May 2004 23:52:28 +0200 From: Eirik Oeverby <ltning@anduin.net> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: current@freebsd.org Subject: Re: enabling second cpu Message-ID: <4099621C.2090107@anduin.net> In-Reply-To: <16536.59752.749995.185110@grasshopper.cs.duke.edu> References: <16536.59752.749995.185110@grasshopper.cs.duke.edu>
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Hi,
Thanks for trying, but this doesn't seem to be enough. The CPU is still
flagged as unusable and SMP is not enabled sysctl kern.smp.active=0.
kern.smp.cpus=1.
I somehow guess this might have been the wrong/not the only place to do
such a 'hack'? Been looking around a bit myself, but have given up at
this point - I'm no C coder, really, and definitely no kernel hacker..
/Eirik
Andrew Gallatin wrote:
> Just a guess, but maybe WinXP is ignoring the flags in the mptable
> which mark the CPU as not usable.
>
> Try something like the appended patch and see if it helps.
> (make sure you have a backup kernel just in case it blows up).
>
> Drew
>
> Index: i386/i386/mptable.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/i386/i386/mptable.c,v
> retrieving revision 1.229
> diff -u -r1.229 mptable.c
> --- i386/i386/mptable.c 10 Dec 2003 19:29:39 -0000 1.229
> +++ i386/i386/mptable.c 5 May 2004 13:13:41 -0000
> @@ -414,7 +414,7 @@
> switch (*entry) {
> case MPCT_ENTRY_PROCESSOR:
> proc = (proc_entry_ptr)entry;
> - if (proc->cpu_flags & PROCENTRY_FLAG_EN) {
> + if (1 /*proc->cpu_flags & PROCENTRY_FLAG_EN*/) {
> lapic_create(proc->apic_id, proc->cpu_flags &
> PROCENTRY_FLAG_BP);
> cpu_mask = (u_int *)arg;
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