Diff: platform/mbed_mpu_mgmt.c

Revision:

189:f392fc9709a3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/mbed_mpu_mgmt.c	Wed Feb 20 22:31:08 2019 +0000
@@ -0,0 +1,72 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ *
+ * 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 "platform/mbed_mpu_mgmt.h"
+#include "platform/mbed_critical.h"
+#include "platform/mbed_assert.h"
+#include "hal/mpu_api.h"
+#include <limits.h>
+
+#if DEVICE_MPU && MBED_CONF_PLATFORM_USE_MPU
+
+static uint16_t mem_xn_lock;
+static uint16_t mem_wn_lock;
+
+void mbed_mpu_manager_lock_ram_execution()
+{
+    core_util_critical_section_enter();
+    MBED_ASSERT(mem_xn_lock != USHRT_MAX);
+    if (mem_xn_lock == 0) {
+        mbed_mpu_enable_ram_xn(false);
+    }
+    mem_xn_lock++;
+    core_util_critical_section_exit();
+}
+
+void mbed_mpu_manager_unlock_ram_execution()
+{
+    core_util_critical_section_enter();
+    MBED_ASSERT(mem_xn_lock != 0);
+    mem_xn_lock--;
+    if (mem_xn_lock == 0) {
+        mbed_mpu_enable_ram_xn(true);
+    }
+    core_util_critical_section_exit();
+}
+
+void mbed_mpu_manager_lock_rom_write()
+{
+    core_util_critical_section_enter();
+    MBED_ASSERT(mem_wn_lock != USHRT_MAX);
+    if (mem_wn_lock == 0) {
+        mbed_mpu_enable_rom_wn(false);
+    }
+    mem_wn_lock++;
+    core_util_critical_section_exit();
+}
+
+void mbed_mpu_manager_unlock_rom_write()
+{
+    core_util_critical_section_enter();
+    MBED_ASSERT(mem_wn_lock != 0);
+    mem_wn_lock--;
+    if (mem_wn_lock == 0) {
+        mbed_mpu_enable_rom_wn(true);
+    }
+    core_util_critical_section_exit();
+}
+
+#endif