50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*
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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <ipxe/nap.h>
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#include <ipxe/efi/efi.h>
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/** @file
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*
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* iPXE CPU sleeping API for EFI
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*
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*/
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/**
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* Sleep until next interrupt
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*
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*/
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static void efix86_cpu_nap ( void ) {
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/*
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* I can't find any EFI API that allows us to put the CPU to
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* sleep. The CpuSleep() function is defined in CpuLib.h, but
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* isn't part of any exposed protocol so we have no way to
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* call it.
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*
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* The EFI shell doesn't seem to bother sleeping the CPU; it
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* just sits there idly burning power.
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*
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*/
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__asm__ __volatile__ ( "hlt" );
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}
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PROVIDE_NAP ( efix86, cpu_nap, efix86_cpu_nap );
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