]> git.karo-electronics.de Git - linux-beck.git/commit
x86-64/efi: Use EFI to deal with platform wall clock
authorJan Beulich <JBeulich@suse.com>
Fri, 25 May 2012 15:20:31 +0000 (16:20 +0100)
committerIngo Molnar <mingo@kernel.org>
Wed, 6 Jun 2012 09:48:05 +0000 (11:48 +0200)
commitbacef661acdb634170a8faddbc1cf28e8f8b9eee
tree76479c7d6f7b6aed38000ec60e5d739e2359a7f9
parenteea5b5510fc5545d15b69da8e485a7424ae388cf
x86-64/efi: Use EFI to deal with platform wall clock

Other than ix86, x86-64 on EFI so far didn't set the
{g,s}et_wallclock accessors to the EFI routines, thus
incorrectly using raw RTC accesses instead.

Simply removing the #ifdef around the respective code isn't
enough, however: While so far early get-time calls were done in
physical mode, this doesn't work properly for x86-64, as virtual
addresses would still need to be set up for all runtime regions
(which wasn't the case on the system I have access to), so
instead the patch moves the call to efi_enter_virtual_mode()
ahead (which in turn allows to drop all code related to calling
efi-get-time in physical mode).

Additionally the earlier calling of efi_set_executable()
requires the CPA code to cope, i.e. during early boot it must be
avoided to call cpa_flush_array(), as the first thing this
function does is a BUG_ON(irqs_disabled()).

Also make the two EFI functions in question here static -
they're not being referenced elsewhere.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Tested-by: Matt Fleming <matt.fleming@intel.com>
Acked-by: Matthew Garrett <mjg@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4FBFBF5F020000780008637F@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/mm/pageattr.c
arch/x86/platform/efi/efi.c
include/linux/efi.h
init/main.c