1 /******************************************************************************
3 * @brief CMSIS MPU API for Armv8-M and Armv8.1-M MPU
5 * @date 03. February 2021
6 ******************************************************************************/
8 * Copyright (c) 2017-2021 Arm Limited. All rights reserved.
10 * SPDX-License-Identifier: Apache-2.0
12 * Licensed under the Apache License, Version 2.0 (the License); you may
13 * not use this file except in compliance with the License.
14 * You may obtain a copy of the License at
16 * www.apache.org/licenses/LICENSE-2.0
18 * Unless required by applicable law or agreed to in writing, software
19 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
20 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
21 * See the License for the specific language governing permissions and
22 * limitations under the License.
25 #if defined ( __ICCARM__ )
26 #pragma system_include /* treat file as system include file for MISRA check */
27 #elif defined (__clang__)
28 #pragma clang system_header /* treat file as system include file */
31 #ifndef ARM_MPU_ARMV8_H
32 #define ARM_MPU_ARMV8_H
34 /** \brief Attribute for device memory (outer only) */
35 #define ARM_MPU_ATTR_DEVICE ( 0U )
37 /** \brief Attribute for non-cacheable, normal memory */
38 #define ARM_MPU_ATTR_NON_CACHEABLE ( 4U )
40 /** \brief Attribute for normal memory (outer and inner)
41 * \param NT Non-Transient: Set to 1 for non-transient data.
42 * \param WB Write-Back: Set to 1 to use write-back update policy.
43 * \param RA Read Allocation: Set to 1 to use cache allocation on read miss.
44 * \param WA Write Allocation: Set to 1 to use cache allocation on write miss.
46 #define ARM_MPU_ATTR_MEMORY_(NT, WB, RA, WA) \
47 ((((NT) & 1U) << 3U) | (((WB) & 1U) << 2U) | (((RA) & 1U) << 1U) | ((WA) & 1U))
49 /** \brief Device memory type non Gathering, non Re-ordering, non Early Write Acknowledgement */
50 #define ARM_MPU_ATTR_DEVICE_nGnRnE (0U)
52 /** \brief Device memory type non Gathering, non Re-ordering, Early Write Acknowledgement */
53 #define ARM_MPU_ATTR_DEVICE_nGnRE (1U)
55 /** \brief Device memory type non Gathering, Re-ordering, Early Write Acknowledgement */
56 #define ARM_MPU_ATTR_DEVICE_nGRE (2U)
58 /** \brief Device memory type Gathering, Re-ordering, Early Write Acknowledgement */
59 #define ARM_MPU_ATTR_DEVICE_GRE (3U)
61 /** \brief Memory Attribute
62 * \param O Outer memory attributes
63 * \param I O == ARM_MPU_ATTR_DEVICE: Device memory attributes, else: Inner memory attributes
65 #define ARM_MPU_ATTR(O, I) ((((O) & 0xFU) << 4U) | ((((O) & 0xFU) != 0U) ? ((I) & 0xFU) : (((I) & 0x3U) << 2U)))
67 /** \brief Normal memory non-shareable */
68 #define ARM_MPU_SH_NON (0U)
70 /** \brief Normal memory outer shareable */
71 #define ARM_MPU_SH_OUTER (2U)
73 /** \brief Normal memory inner shareable */
74 #define ARM_MPU_SH_INNER (3U)
76 /** \brief Memory access permissions
77 * \param RO Read-Only: Set to 1 for read-only memory.
78 * \param NP Non-Privileged: Set to 1 for non-privileged memory.
80 #define ARM_MPU_AP_(RO, NP) ((((RO) & 1U) << 1U) | ((NP) & 1U))
82 /** \brief Region Base Address Register value
83 * \param BASE The base address bits [31:5] of a memory region. The value is zero extended. Effective address gets 32 byte aligned.
84 * \param SH Defines the Shareability domain for this memory region.
85 * \param RO Read-Only: Set to 1 for a read-only memory region.
86 * \param NP Non-Privileged: Set to 1 for a non-privileged memory region.
87 * \oaram XN eXecute Never: Set to 1 for a non-executable memory region.
89 #define ARM_MPU_RBAR(BASE, SH, RO, NP, XN) \
90 (((BASE) & MPU_RBAR_BASE_Msk) | \
91 (((SH) << MPU_RBAR_SH_Pos) & MPU_RBAR_SH_Msk) | \
92 ((ARM_MPU_AP_(RO, NP) << MPU_RBAR_AP_Pos) & MPU_RBAR_AP_Msk) | \
93 (((XN) << MPU_RBAR_XN_Pos) & MPU_RBAR_XN_Msk))
95 /** \brief Region Limit Address Register value
96 * \param LIMIT The limit address bits [31:5] for this memory region. The value is one extended.
97 * \param IDX The attribute index to be associated with this memory region.
99 #define ARM_MPU_RLAR(LIMIT, IDX) \
100 (((LIMIT) & MPU_RLAR_LIMIT_Msk) | \
101 (((IDX) << MPU_RLAR_AttrIndx_Pos) & MPU_RLAR_AttrIndx_Msk) | \
104 #if defined(MPU_RLAR_PXN_Pos)
106 /** \brief Region Limit Address Register with PXN value
107 * \param LIMIT The limit address bits [31:5] for this memory region. The value is one extended.
108 * \param PXN Privileged execute never. Defines whether code can be executed from this privileged region.
109 * \param IDX The attribute index to be associated with this memory region.
111 #define ARM_MPU_RLAR_PXN(LIMIT, PXN, IDX) \
112 (((LIMIT) & MPU_RLAR_LIMIT_Msk) | \
113 (((PXN) << MPU_RLAR_PXN_Pos) & MPU_RLAR_PXN_Msk) | \
114 (((IDX) << MPU_RLAR_AttrIndx_Pos) & MPU_RLAR_AttrIndx_Msk) | \
120 * Struct for a single MPU Region
123 uint32_t RBAR; /*!< Region Base Address Register value */
124 uint32_t RLAR; /*!< Region Limit Address Register value */
128 * \param MPU_Control Default access permissions for unconfigured regions.
130 __STATIC_INLINE void ARM_MPU_Enable(uint32_t MPU_Control)
133 MPU->CTRL = MPU_Control | MPU_CTRL_ENABLE_Msk;
134 #ifdef SCB_SHCSR_MEMFAULTENA_Msk
135 SCB->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk;
143 __STATIC_INLINE void ARM_MPU_Disable(void)
146 #ifdef SCB_SHCSR_MEMFAULTENA_Msk
147 SCB->SHCSR &= ~SCB_SHCSR_MEMFAULTENA_Msk;
149 MPU->CTRL &= ~MPU_CTRL_ENABLE_Msk;
155 /** Enable the Non-secure MPU.
156 * \param MPU_Control Default access permissions for unconfigured regions.
158 __STATIC_INLINE void ARM_MPU_Enable_NS(uint32_t MPU_Control)
161 MPU_NS->CTRL = MPU_Control | MPU_CTRL_ENABLE_Msk;
162 #ifdef SCB_SHCSR_MEMFAULTENA_Msk
163 SCB_NS->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk;
169 /** Disable the Non-secure MPU.
171 __STATIC_INLINE void ARM_MPU_Disable_NS(void)
174 #ifdef SCB_SHCSR_MEMFAULTENA_Msk
175 SCB_NS->SHCSR &= ~SCB_SHCSR_MEMFAULTENA_Msk;
177 MPU_NS->CTRL &= ~MPU_CTRL_ENABLE_Msk;
183 /** Set the memory attribute encoding to the given MPU.
184 * \param mpu Pointer to the MPU to be configured.
185 * \param idx The attribute index to be set [0-7]
186 * \param attr The attribute value to be set.
188 __STATIC_INLINE void ARM_MPU_SetMemAttrEx(MPU_Type* mpu, uint8_t idx, uint8_t attr)
190 const uint8_t reg = idx / 4U;
191 const uint32_t pos = ((idx % 4U) * 8U);
192 const uint32_t mask = 0xFFU << pos;
194 if (reg >= (sizeof(mpu->MAIR) / sizeof(mpu->MAIR[0]))) {
195 return; // invalid index
198 mpu->MAIR[reg] = ((mpu->MAIR[reg] & ~mask) | ((attr << pos) & mask));
201 /** Set the memory attribute encoding.
202 * \param idx The attribute index to be set [0-7]
203 * \param attr The attribute value to be set.
205 __STATIC_INLINE void ARM_MPU_SetMemAttr(uint8_t idx, uint8_t attr)
207 ARM_MPU_SetMemAttrEx(MPU, idx, attr);
211 /** Set the memory attribute encoding to the Non-secure MPU.
212 * \param idx The attribute index to be set [0-7]
213 * \param attr The attribute value to be set.
215 __STATIC_INLINE void ARM_MPU_SetMemAttr_NS(uint8_t idx, uint8_t attr)
217 ARM_MPU_SetMemAttrEx(MPU_NS, idx, attr);
221 /** Clear and disable the given MPU region of the given MPU.
222 * \param mpu Pointer to MPU to be used.
223 * \param rnr Region number to be cleared.
225 __STATIC_INLINE void ARM_MPU_ClrRegionEx(MPU_Type* mpu, uint32_t rnr)
231 /** Clear and disable the given MPU region.
232 * \param rnr Region number to be cleared.
234 __STATIC_INLINE void ARM_MPU_ClrRegion(uint32_t rnr)
236 ARM_MPU_ClrRegionEx(MPU, rnr);
240 /** Clear and disable the given Non-secure MPU region.
241 * \param rnr Region number to be cleared.
243 __STATIC_INLINE void ARM_MPU_ClrRegion_NS(uint32_t rnr)
245 ARM_MPU_ClrRegionEx(MPU_NS, rnr);
249 /** Configure the given MPU region of the given MPU.
250 * \param mpu Pointer to MPU to be used.
251 * \param rnr Region number to be configured.
252 * \param rbar Value for RBAR register.
253 * \param rlar Value for RLAR register.
255 __STATIC_INLINE void ARM_MPU_SetRegionEx(MPU_Type* mpu, uint32_t rnr, uint32_t rbar, uint32_t rlar)
262 /** Configure the given MPU region.
263 * \param rnr Region number to be configured.
264 * \param rbar Value for RBAR register.
265 * \param rlar Value for RLAR register.
267 __STATIC_INLINE void ARM_MPU_SetRegion(uint32_t rnr, uint32_t rbar, uint32_t rlar)
269 ARM_MPU_SetRegionEx(MPU, rnr, rbar, rlar);
273 /** Configure the given Non-secure MPU region.
274 * \param rnr Region number to be configured.
275 * \param rbar Value for RBAR register.
276 * \param rlar Value for RLAR register.
278 __STATIC_INLINE void ARM_MPU_SetRegion_NS(uint32_t rnr, uint32_t rbar, uint32_t rlar)
280 ARM_MPU_SetRegionEx(MPU_NS, rnr, rbar, rlar);
284 /** Memcpy with strictly ordered memory access, e.g. used by code in ARM_MPU_LoadEx()
285 * \param dst Destination data is copied to.
286 * \param src Source data is copied from.
287 * \param len Amount of data words to be copied.
289 __STATIC_INLINE void ARM_MPU_OrderedMemcpy(volatile uint32_t* dst, const uint32_t* __RESTRICT src, uint32_t len)
292 for (i = 0U; i < len; ++i)
298 /** Load the given number of MPU regions from a table to the given MPU.
299 * \param mpu Pointer to the MPU registers to be used.
300 * \param rnr First region number to be configured.
301 * \param table Pointer to the MPU configuration table.
302 * \param cnt Amount of regions to be configured.
304 __STATIC_INLINE void ARM_MPU_LoadEx(MPU_Type* mpu, uint32_t rnr, ARM_MPU_Region_t const* table, uint32_t cnt)
306 const uint32_t rowWordSize = sizeof(ARM_MPU_Region_t)/4U;
309 ARM_MPU_OrderedMemcpy(&(mpu->RBAR), &(table->RBAR), rowWordSize);
311 uint32_t rnrBase = rnr & ~(MPU_TYPE_RALIASES-1U);
312 uint32_t rnrOffset = rnr % MPU_TYPE_RALIASES;
315 while ((rnrOffset + cnt) > MPU_TYPE_RALIASES) {
316 uint32_t c = MPU_TYPE_RALIASES - rnrOffset;
317 ARM_MPU_OrderedMemcpy(&(mpu->RBAR)+(rnrOffset*2U), &(table->RBAR), c*rowWordSize);
321 rnrBase += MPU_TYPE_RALIASES;
325 ARM_MPU_OrderedMemcpy(&(mpu->RBAR)+(rnrOffset*2U), &(table->RBAR), cnt*rowWordSize);
329 /** Load the given number of MPU regions from a table.
330 * \param rnr First region number to be configured.
331 * \param table Pointer to the MPU configuration table.
332 * \param cnt Amount of regions to be configured.
334 __STATIC_INLINE void ARM_MPU_Load(uint32_t rnr, ARM_MPU_Region_t const* table, uint32_t cnt)
336 ARM_MPU_LoadEx(MPU, rnr, table, cnt);
340 /** Load the given number of MPU regions from a table to the Non-secure MPU.
341 * \param rnr First region number to be configured.
342 * \param table Pointer to the MPU configuration table.
343 * \param cnt Amount of regions to be configured.
345 __STATIC_INLINE void ARM_MPU_Load_NS(uint32_t rnr, ARM_MPU_Region_t const* table, uint32_t cnt)
347 ARM_MPU_LoadEx(MPU_NS, rnr, table, cnt);