Messages in this thread | | | Date | Fri, 13 Nov 2009 00:29:35 +0300 | From | Cyrill Gorcunov <> | Subject | Re: Reading /dev/mem by dd |
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On Thu, Nov 12, 2009 at 10:07:22PM +0100, Krzysztof Halasa wrote: > "Henrique de Moraes Holschuh" <hmh@hmh.eng.br> writes: > > > In this case, the problem seems to be access over /dev/mem to stuff the > > kernel is already taking care of. > > Not sure if local APIC counts as "PCI space and the BIOS code and data > regions" but: > > $ grep STRICT_DEVMEM -A 15 arch/x86/Kconfig.debug > config STRICT_DEVMEM > bool "Filter access to /dev/mem" > ---help--- >
Yes, having this option turned on an access to LAPIC/IO_APIC space will be forbidden.
-- Cyrill
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