Import Mbed OS hard-float snapshot

platform/source/mbed_critical.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2015-2019, ARM Limited, All Rights Reserved
+ * 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.
+ */
+
+/* Declare __STDC_LIMIT_MACROS so stdint.h defines UINT32_MAX when using C++ */
+#define __STDC_LIMIT_MACROS
+#include "hal/critical_section_api.h"
+
+#include "cmsis.h"
+#include "platform/mbed_assert.h"
+#include "platform/mbed_critical.h"
+
+static uint32_t critical_section_reentrancy_counter = 0;
+
+bool core_util_are_interrupts_enabled(void)
+{
+#if defined(__CORTEX_A9)
+    return ((__get_CPSR() & 0x80) == 0);
+#else
+    return ((__get_PRIMASK() & 0x1) == 0);
+#endif
+}
+
+bool core_util_is_isr_active(void)
+{
+#if defined(__CORTEX_A9)
+    switch (__get_CPSR() & 0x1FU) {
+        case CPSR_M_USR:
+        case CPSR_M_SYS:
+            return false;
+        case CPSR_M_SVC:
+        default:
+            return true;
+    }
+#else
+    return (__get_IPSR() != 0U);
+#endif
+}
+
+bool core_util_in_critical_section(void)
+{
+    return hal_in_critical_section();
+}
+
+void core_util_critical_section_enter(void)
+{
+    hal_critical_section_enter();
+
+    // If the reentrancy counter overflows something has gone badly wrong.
+    MBED_ASSERT(critical_section_reentrancy_counter < UINT32_MAX);
+
+    ++critical_section_reentrancy_counter;
+}
+
+void core_util_critical_section_exit(void)
+{
+
+    // If critical_section_enter has not previously been called, do nothing
+    if (critical_section_reentrancy_counter == 0) {
+        return;
+    }
+
+    --critical_section_reentrancy_counter;
+
+    if (critical_section_reentrancy_counter == 0) {
+        hal_critical_section_exit();
+    }
+}