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[loong64] Add CPU sleeping API for EFI LoongArch64

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Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Xiaotian Wu 2023-06-29 15:49:27 +01:00 committed by Michael Brown
parent 0c67a3632d
commit 6d98e0ca47
4 changed files with 75 additions and 1 deletions
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1
src/arch/loong64/Makefile
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@ -20,6 +20,7 @@ CFLAGS += -fshort-wchar
# LoongArch64-specific directories containing source files
SRCDIRS += arch/loong64/core
SRCDIRS += arch/loong64/interface/efi
# Include platform-specific Makefile
MAKEDEPS += arch/loong64/Makefile.$(PLATFORM)

4
src/arch/loong64/include/bits/nap.h
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@ -9,4 +9,6 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#endif /* _BITS_MAP_H */
#include <ipxe/efi/efiloong64_nap.h>
#endif /* _BITS_NAP_H */

18
src/arch/loong64/include/ipxe/efi/efiloong64_nap.h Normal file
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@ -0,0 +1,18 @@
#ifndef _IPXE_EFILOONG64_NAP_H
#define _IPXE_EFILOONG64_NAP_H
/** @file
*
* EFI CPU sleeping
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#ifdef NAP_EFILOONG64
#define NAP_PREFIX_efiloong64
#else
#define NAP_PREFIX_efiloong64 __efiloong64_
#endif
#endif /* _IPXE_EFILOONG64_NAP_H */

53
src/arch/loong64/interface/efi/efiloong64_nap.c Normal file
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@ -0,0 +1,53 @@
/*
* Copyright (c) 2023, Xiaotian Wu <wuxiaotian@loongson.cn>
*
* 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 efiloong64_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__ ( "idle 0" );
}
PROVIDE_NAP ( efiloong64, cpu_nap, efiloong64_cpu_nap );