Jan Beulich bd52276fa1
x86-64/efi: Use EFI to deal with platform wall clock (again) ...
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.
History:
This commit was originally merged as bacef661acf026cfa82fjbeulich@suse.com >
Tested-by: Matt Fleming <matt.fleming@intel.com >
Acked-by: Matthew Garrett <mjg@redhat.com >
Cc: Ingo Molnar <mingo@kernel.org >
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl >
Cc: H. Peter Anvin <hpa@zytor.com >
Signed-off-by: Matt Fleming <matt.fleming@intel.com > [added commit history]
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