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- /*
- * Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <ipxe/nap.h>
- #include <ipxe/efi/efi.h>
-
- /** @file
- *
- * iPXE CPU sleeping API for EFI
- *
- */
-
- /**
- * Sleep until next interrupt
- *
- */
- static void efiarm_cpu_nap ( void ) {
- /*
- * I can't find any EFI API that allows us to put the CPU to
- * sleep. The CpuSleep() function is defined in CpuLib.h, but
- * isn't part of any exposed protocol so we have no way to
- * call it.
- *
- * The EFI shell doesn't seem to bother sleeping the CPU; it
- * just sits there idly burning power.
- *
- */
- __asm__ __volatile__ ( "wfi" );
- }
-
- PROVIDE_NAP ( efiarm, cpu_nap, efiarm_cpu_nap );
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