mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

platform/mbed_mpu_mgmt.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 189:f392fc9709a3 1 /* mbed Microcontroller Library
AnnaBridge 189:f392fc9709a3 2 * Copyright (c) 2018 ARM Limited
AnnaBridge 189:f392fc9709a3 3 *
AnnaBridge 189:f392fc9709a3 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 189:f392fc9709a3 5 * you may not use this file except in compliance with the License.
AnnaBridge 189:f392fc9709a3 6 * You may obtain a copy of the License at
AnnaBridge 189:f392fc9709a3 7 *
AnnaBridge 189:f392fc9709a3 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 189:f392fc9709a3 9 *
AnnaBridge 189:f392fc9709a3 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 189:f392fc9709a3 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 189:f392fc9709a3 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 189:f392fc9709a3 13 * See the License for the specific language governing permissions and
AnnaBridge 189:f392fc9709a3 14 * limitations under the License.
AnnaBridge 189:f392fc9709a3 15 */
AnnaBridge 189:f392fc9709a3 16
AnnaBridge 189:f392fc9709a3 17 #include "platform/mbed_mpu_mgmt.h"
AnnaBridge 189:f392fc9709a3 18 #include "platform/mbed_critical.h"
AnnaBridge 189:f392fc9709a3 19 #include "platform/mbed_assert.h"
AnnaBridge 189:f392fc9709a3 20 #include "hal/mpu_api.h"
AnnaBridge 189:f392fc9709a3 21 #include <limits.h>
AnnaBridge 189:f392fc9709a3 22
AnnaBridge 189:f392fc9709a3 23 #if DEVICE_MPU && MBED_CONF_PLATFORM_USE_MPU
AnnaBridge 189:f392fc9709a3 24
AnnaBridge 189:f392fc9709a3 25 static uint16_t mem_xn_lock;
AnnaBridge 189:f392fc9709a3 26 static uint16_t mem_wn_lock;
AnnaBridge 189:f392fc9709a3 27
AnnaBridge 189:f392fc9709a3 28 void mbed_mpu_manager_lock_ram_execution()
AnnaBridge 189:f392fc9709a3 29 {
AnnaBridge 189:f392fc9709a3 30 core_util_critical_section_enter();
AnnaBridge 189:f392fc9709a3 31 MBED_ASSERT(mem_xn_lock != USHRT_MAX);
AnnaBridge 189:f392fc9709a3 32 if (mem_xn_lock == 0) {
AnnaBridge 189:f392fc9709a3 33 mbed_mpu_enable_ram_xn(false);
AnnaBridge 189:f392fc9709a3 34 }
AnnaBridge 189:f392fc9709a3 35 mem_xn_lock++;
AnnaBridge 189:f392fc9709a3 36 core_util_critical_section_exit();
AnnaBridge 189:f392fc9709a3 37 }
AnnaBridge 189:f392fc9709a3 38
AnnaBridge 189:f392fc9709a3 39 void mbed_mpu_manager_unlock_ram_execution()
AnnaBridge 189:f392fc9709a3 40 {
AnnaBridge 189:f392fc9709a3 41 core_util_critical_section_enter();
AnnaBridge 189:f392fc9709a3 42 MBED_ASSERT(mem_xn_lock != 0);
AnnaBridge 189:f392fc9709a3 43 mem_xn_lock--;
AnnaBridge 189:f392fc9709a3 44 if (mem_xn_lock == 0) {
AnnaBridge 189:f392fc9709a3 45 mbed_mpu_enable_ram_xn(true);
AnnaBridge 189:f392fc9709a3 46 }
AnnaBridge 189:f392fc9709a3 47 core_util_critical_section_exit();
AnnaBridge 189:f392fc9709a3 48 }
AnnaBridge 189:f392fc9709a3 49
AnnaBridge 189:f392fc9709a3 50 void mbed_mpu_manager_lock_rom_write()
AnnaBridge 189:f392fc9709a3 51 {
AnnaBridge 189:f392fc9709a3 52 core_util_critical_section_enter();
AnnaBridge 189:f392fc9709a3 53 MBED_ASSERT(mem_wn_lock != USHRT_MAX);
AnnaBridge 189:f392fc9709a3 54 if (mem_wn_lock == 0) {
AnnaBridge 189:f392fc9709a3 55 mbed_mpu_enable_rom_wn(false);
AnnaBridge 189:f392fc9709a3 56 }
AnnaBridge 189:f392fc9709a3 57 mem_wn_lock++;
AnnaBridge 189:f392fc9709a3 58 core_util_critical_section_exit();
AnnaBridge 189:f392fc9709a3 59 }
AnnaBridge 189:f392fc9709a3 60
AnnaBridge 189:f392fc9709a3 61 void mbed_mpu_manager_unlock_rom_write()
AnnaBridge 189:f392fc9709a3 62 {
AnnaBridge 189:f392fc9709a3 63 core_util_critical_section_enter();
AnnaBridge 189:f392fc9709a3 64 MBED_ASSERT(mem_wn_lock != 0);
AnnaBridge 189:f392fc9709a3 65 mem_wn_lock--;
AnnaBridge 189:f392fc9709a3 66 if (mem_wn_lock == 0) {
AnnaBridge 189:f392fc9709a3 67 mbed_mpu_enable_rom_wn(true);
AnnaBridge 189:f392fc9709a3 68 }
AnnaBridge 189:f392fc9709a3 69 core_util_critical_section_exit();
AnnaBridge 189:f392fc9709a3 70 }
AnnaBridge 189:f392fc9709a3 71
AnnaBridge 189:f392fc9709a3 72 #endif