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Re: Comments about SMP
From: |
Almudena Garcia |
Subject: |
Re: Comments about SMP |
Date: |
Mon, 11 Mar 2019 00:53:43 +0000 |
>> It appears mach_ncpus is hardcoded at compile time, maybe you just need
> to detect this value via ACPI (?)
Yes, this is the idea. I set mach_ncpus to maximum value to avoid broken the
cpu structure arrays.
But It's not the only that I need to enable cpus. I also need to find their
APIC structures (Local APIC and IOAPIC), to send IPI and communicate the cpus.
El Lunes 11 de marzo de 2019, Damien Zammit escribió:
> Hi Almudena,
>
> > El dom., 10 mar. 2019 a las 18:35, Samuel Thibault
> > (<samuel.thibault@gnu.org <mailto:samuel.thibault@gnu.org>>) escribió:
> > Adam Van Ymeren, le dim. 10 mars 2019 13:08:23 -0400, a ecrit:
> > > I don't think that's necessary. The process doesn't have to
> > initiated from gnumach. Hurd could have an SMP server that is
> > started at boot, parses acpi tables and calls in to Mach to
> > initialize the additional cores and start scheduling on them.
> >
> > That's the idea.
>
> I'm not sure if it is required to send IPI etc, doesn't the BIOS set up
> the extra cores? I've seen code in coreboot that sets up the extra
> cores. I thought you only need the ACPI tables to know how many cores
> to use and pass this value somehow to Mach (?)
>
> See
> https://github.com/AlmuHS/GNUMach_SMP/blob/5bceb7fc20176b75ed3284ca3fc9856dfe2cd158/configfrag.ac#L33
>
> It appears mach_ncpus is hardcoded at compile time, maybe you just need
> to detect this value via ACPI (?) Maybe someone else can comment on how
> "broken" is multiprocessor support as specified in that inline comment.
>
> Damien
>
--
Enviado desde mi Sailfish OS
- Re: Comments about SMP, Samuel Thibault, 2019/03/10
- Re: Comments about SMP, Almudena Garcia, 2019/03/10
- Re: Comments about SMP, Samuel Thibault, 2019/03/10
- Re: Comments about SMP, Almudena Garcia, 2019/03/10
- Re: Comments about SMP, Adam Van Ymeren, 2019/03/10
- Re: Comments about SMP, Samuel Thibault, 2019/03/10
- Re: Comments about SMP, Almudena Garcia, 2019/03/10
- Re: Comments about SMP, Damien Zammit, 2019/03/10
- Re: Comments about SMP,
Almudena Garcia <=