Messages in this thread | | | Date | Wed, 6 Aug 2014 14:29:41 +0100 | From | Leif Lindholm <> | Subject | Re: [PATCH 1/2] UEFI arm64: add noefi boot param |
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On Wed, Aug 06, 2014 at 02:20:21PM +0100, Matt Fleming wrote: > > Since this is really turning an x86-specific feature into a generic > > one, could it be moved to core code? > > Maybe an efi.mask, reusing the efi_enabled defines, with an > > efi_disabled macro? > > Why the new efi_disabled() and efi.mask? This is all achievable with > efi_enabled() and efi.flags, in fact, this kind of thing is exactly why > they were invented.
Because this flag is indicating which facilities we should not try to enable, rather than which facilities we have enabled.
The EFI_RUNTIME_SERVICES flag is set after successful call to set_virtual_address_map. The apparent intent of "noefi" is to prevent that call from being made in the first place.
Anyway, it was just a suggestion - main point was it would make sense to share the code.
> > Also, since this patch (and its x86 predecessor) is not really > > "noefi", could this be integrated with the "efi=" patch > > (http://permalink.gmane.org/gmane.linux.kernel.efi/4405), > > as an efi=noruntime option? > > > > On x86, due to CSM, "noefi" was a useful fallback for completely > > broken (U)EFI implementations - but on an arm* UEFI system, there will > > be no fallback. Could it be wrapped in a kernel hacking config option? > > I don't mind making "noefi" a synonym for "efi=noruntime" on x86, as > long as we keep "noefi" around with the same semantics it's always had.
Yeah, that would be nice.
/ Leif
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