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author | Simon Rettberg | 2023-10-06 18:37:21 +0200 |
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committer | Simon Rettberg | 2023-10-06 18:37:21 +0200 |
commit | 95a57769874a70456670984debc05084feb75f6b (patch) | |
tree | 9943c86b682e1b1d21a0439637b3849840a50137 /src/arch/loong64/interface/efi/efiloong64_nap.c | |
parent | [efi] Remove old RDRAND hack; now officially supported (diff) | |
parent | [libc] Use wall clock time as seed for the (non-cryptographic) RNG (diff) | |
download | ipxe-95a57769874a70456670984debc05084feb75f6b.tar.gz ipxe-95a57769874a70456670984debc05084feb75f6b.tar.xz ipxe-95a57769874a70456670984debc05084feb75f6b.zip |
Merge branch 'master' into openslx
Diffstat (limited to 'src/arch/loong64/interface/efi/efiloong64_nap.c')
-rw-r--r-- | src/arch/loong64/interface/efi/efiloong64_nap.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/arch/loong64/interface/efi/efiloong64_nap.c b/src/arch/loong64/interface/efi/efiloong64_nap.c new file mode 100644 index 00000000..5cd1c1b9 --- /dev/null +++ b/src/arch/loong64/interface/efi/efiloong64_nap.c @@ -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 ); |