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commit 20098f3b34c2f6537072236d00e6598e3550c2d8
Author: Yanfeng Liu <p-liuyanfe...@xiaomi.com>
AuthorDate: Wed Feb 5 19:39:00 2025 +0800
arch/arm: add semihosting poweroff
This adds semihosting based poweroff to arm/common. It uses
semihosting operation SYS_EXIT (0x18) with parameter AppExit
(0x20026).
Signed-off-by: Yanfeng Liu <p-liuyanfe...@xiaomi.com>
---
arch/arm/Kconfig | 6 ++++
arch/arm/src/common/CMakeLists.txt | 1 +
arch/arm/src/common/Make.defs | 2 +-
arch/arm/src/common/arm_poweroff.c | 71 ++++++++++++++++++++++++++++++++++++++
4 files changed, 79 insertions(+), 1 deletion(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 71031f5dae..3cb35a1d58 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1437,6 +1437,12 @@ config DEBUG_SECUREFAULT
output is sometimes helpful when debugging difficult usage
fault problems,
but may be more than you typically want to see.
+config ARM_SEMIHOSTING_POWEROFF
+ bool "Semihosting POWEROFF support"
+ default n
+ ---help---
+ Enable use of semihosting function to poweroff target.
+
config ARM_SEMIHOSTING_SYSLOG
bool "Semihosting SYSLOG support"
select SYSLOG_REGISTER
diff --git a/arch/arm/src/common/CMakeLists.txt
b/arch/arm/src/common/CMakeLists.txt
index 4353c82435..77cb13a4d0 100644
--- a/arch/arm/src/common/CMakeLists.txt
+++ b/arch/arm/src/common/CMakeLists.txt
@@ -40,6 +40,7 @@ set(SRCS
arm_stackframe.c
arm_usestack.c
arm_fork.c
+ arm_poweroff.c
${ARCH_TOOLCHAIN_PATH}/fork.S)
if(NOT CONFIG_ALARM_ARCH AND NOT CONFIG_TIMER_ARCH)
diff --git a/arch/arm/src/common/Make.defs b/arch/arm/src/common/Make.defs
index 1694083e28..7818eef46e 100644
--- a/arch/arm/src/common/Make.defs
+++ b/arch/arm/src/common/Make.defs
@@ -26,7 +26,7 @@ CMN_CSRCS += arm_allocateheap.c arm_createstack.c arm_exit.c
CMN_CSRCS += arm_getintstack.c arm_initialize.c arm_lowputs.c
CMN_CSRCS += arm_nputs.c arm_releasestack.c arm_registerdump.c
CMN_CSRCS += arm_stackframe.c arm_modifyreg.c
-CMN_CSRCS += arm_usestack.c arm_fork.c
+CMN_CSRCS += arm_usestack.c arm_fork.c arm_poweroff.c
ifneq ($(CONFIG_ALARM_ARCH),y)
ifneq ($(CONFIG_TIMER_ARCH),y)
diff --git a/arch/arm/src/common/arm_poweroff.c
b/arch/arm/src/common/arm_poweroff.c
new file mode 100644
index 0000000000..9481c464c9
--- /dev/null
+++ b/arch/arm/src/common/arm_poweroff.c
@@ -0,0 +1,71 @@
+/***************************************************************************
+ * arch/arm/src/common/arm_poweroff.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ***************************************************************************/
+
+/***************************************************************************
+ * Included Files
+ ***************************************************************************/
+
+#include <nuttx/config.h>
+#include <debug.h>
+
+#include "arch/syscall.h"
+
+#ifdef CONFIG_ARM_SEMIHOSTING_POWEROFF
+
+/***************************************************************************
+ * Preprocessor Definitions
+ ***************************************************************************/
+
+/* per https://github.com/ARM-software/abi-aa semihosting.pdf 2024Q3 */
+
+#define ARMSMH_OPNUM_SYSEXIT 0x18
+#define ARMSMH_PARAM_APPEXIT 0x20026
+
+/***************************************************************************
+ * Public Functions
+ ***************************************************************************/
+
+/***************************************************************************
+ * Name: up_systempoweroff
+ *
+ * Description:
+ * Semihosting EXIT based poweroff logic.
+ *
+ ***************************************************************************/
+
+void up_systempoweroff(void)
+{
+ int ret;
+
+ /* Set up for the system poweroff */
+
+ ret = smh_call(ARMSMH_OPNUM_SYSEXIT, ARMSMH_PARAM_APPEXIT);
+ if (ret)
+ {
+ sinfo("Failed to power off CPU, error code: %d\n", ret);
+ }
+
+ /* Wait for power off */
+
+ for (; ; );
+}
+#endif /* CONFIG_ARM_SEMIHOSTING_POWEROFF */
\ No newline at end of file
