Import Mbed OS hard-float snapshot

connectivity/nanostack/nanostack-hal-mbed-cmsis-rtos/arm_hal_interrupt.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2016-2018, Arm Limited and affiliates.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed 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.
+ */
+
+#include "arm_hal_interrupt.h"
+#include "arm_hal_interrupt_private.h"
+
+#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
+#include "platform/mbed_critical.h"
+#else
+#include "cmsis_os2.h"
+#include "mbed_rtos_storage.h"
+#endif
+
+#include <mbed_assert.h>
+
+
+// The critical section has two alternative implementations, the default which uses mutex
+// as locking primitive and the optional, which will bluntly disable interrupts
+// for the critical section. The mutex version will not cause issues by delaying
+// interrupts, but it has a down side that it can not be used from the interrupt
+// service routines. The IRQ-safe version will do the mutual exclusion by temporarily
+// disabling the interrupts, so it will have effect on interrupt latency.
+#if !MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
+
+static uint8_t sys_irq_disable_counter;
+
+static mbed_rtos_storage_mutex_t critical_mutex;
+static const osMutexAttr_t critical_mutex_attr = {
+    .name = "nanostack_critical_mutex",
+    .attr_bits = osMutexRecursive | osMutexPrioInherit | osMutexRobust,
+    .cb_mem = &critical_mutex,
+    .cb_size = sizeof critical_mutex,
+};
+static osMutexId_t critical_mutex_id;
+
+#endif
+
+void platform_critical_init(void)
+{
+#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
+    // nothing to do here
+#else
+    critical_mutex_id = osMutexNew(&critical_mutex_attr);
+    MBED_ASSERT(critical_mutex_id);
+#endif
+}
+
+void platform_enter_critical(void)
+{
+#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
+    core_util_critical_section_enter();
+#else
+    osMutexAcquire(critical_mutex_id, osWaitForever);
+    sys_irq_disable_counter++;
+#endif
+}
+
+void platform_exit_critical(void)
+{
+#if MBED_CONF_NANOSTACK_HAL_CRITICAL_SECTION_USABLE_FROM_INTERRUPT
+    core_util_critical_section_exit();
+#else
+    --sys_irq_disable_counter;
+    osMutexRelease(critical_mutex_id);
+#endif
+}