Messages in this thread | ![/](/images/icornerl.gif) | | From | Marc-Christian Petersen <> | Subject | Re: [PATCH][2.4.22-rc2] Disable APIC on reboot. | Date | Fri, 15 Aug 2003 21:22:10 +0200 |
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On Tuesday 12 August 2003 01:33, Mikael Pettersson wrote:
Hi Mikael,
> disable_local_APIC() now checks if detect_init_APIC() enabled the > local APIC via the APIC_BASE MSR, and if so it now disables APIC_BASE. > Previously we would leave APIC_BASE enabled, and that made some > BIOSen unhappy. > The SMP reboot code calls disable_local_APIC(). On SMP HW there is > no change since detect_init_APIC() isn't called and APIC_BASE isn't > enabled by us. An SMP kernel on UP HW behaves just like an UP_APIC > kernel, so it disables APIC_BASE if we enabled it at boot. > The UP_APIC disable-before-suspend code is simplified since the existing > code to disable APIC_BASE is moved into disable_local_APIC(). > (Felix Kühling originally reported the BIOS reboot problem. This is a > fixed-up version of his preliminary patch.)
please correct me if I say something really stupid now but shouldn't the APIC be disabled only during reboot time and enabled again at a new boot?
my experience with this patch is, after a reboot he APIC isn't enabled again until I power off my machine.
ciao, Marc
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