efi_loader: implement task priority level (TPL)
Define variable holding tpl. Implement RaiseTPL and RestoreTPL. Implement TPL check in efi_signal_event. Implement TPL check in efi_wait_for_event. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: NAlexander Graf <agraf@suse.de>
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