From 3f2546b2ef55b661fd8dd69682b38992225e86f6 Mon Sep 17 00:00:00 2001 From: fishsoupisgood Date: Mon, 29 Apr 2019 01:17:54 +0100 Subject: Initial import of qemu-2.4.1 --- roms/ipxe/src/arch/x86/interface/efi/efix86_nap.c | 49 +++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 roms/ipxe/src/arch/x86/interface/efi/efix86_nap.c (limited to 'roms/ipxe/src/arch/x86/interface/efi') diff --git a/roms/ipxe/src/arch/x86/interface/efi/efix86_nap.c b/roms/ipxe/src/arch/x86/interface/efi/efix86_nap.c new file mode 100644 index 00000000..b05421fa --- /dev/null +++ b/roms/ipxe/src/arch/x86/interface/efi/efix86_nap.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2008 Michael Brown . + * + * 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. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +#include +#include + +/** @file + * + * iPXE CPU sleeping API for EFI + * + */ + +/** + * Sleep until next interrupt + * + */ +static void efix86_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__ ( "hlt" ); +} + +PROVIDE_NAP ( efix86, cpu_nap, efix86_cpu_nap ); -- cgit v1.2.3