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authorSimon Rettberg2023-10-06 18:37:21 +0200
committerSimon Rettberg2023-10-06 18:37:21 +0200
commit95a57769874a70456670984debc05084feb75f6b (patch)
tree9943c86b682e1b1d21a0439637b3849840a50137 /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)
downloadipxe-95a57769874a70456670984debc05084feb75f6b.tar.gz
ipxe-95a57769874a70456670984debc05084feb75f6b.tar.xz
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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.c53
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
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+++ 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 );