mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
targets/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_mpu.c
- Committer:
- <>
- Date:
- 2017-03-30
- Revision:
- 161:2cc1468da177
- Parent:
- 150:02e0a0aed4ec
- Child:
- 179:b0033dcd6934
File content as of revision 161:2cc1468da177:
/***************************************************************************//** * @file em_mpu.c * @brief Memory Protection Unit (MPU) Peripheral API * @version 5.1.2 ******************************************************************************* * @section License * <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.com</b> ******************************************************************************* * * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 3. This notice may not be removed or altered from any source distribution. * * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no * obligation to support this Software. Silicon Labs is providing the * Software "AS IS", with no express or implied warranties of any kind, * including, but not limited to, any implied warranties of merchantability * or fitness for any particular purpose or warranties against infringement * of any proprietary rights of a third party. * * Silicon Labs will not be liable for any consequential, incidental, or * special damages, or any other relief, or for any claim by any third party, * arising from your use of this Software. * ******************************************************************************/ #include "em_mpu.h" #if defined(__MPU_PRESENT) && (__MPU_PRESENT == 1) #include "em_assert.h" /***************************************************************************//** * @addtogroup emlib * @{ ******************************************************************************/ /***************************************************************************//** * @addtogroup MPU * @brief Memory Protection Unit (MPU) Peripheral API * @details * This module contains functions to enable, disable and setup the MPU. * The MPU is used to control access attributes and permissions in the * memory map. The settings that can be controlled are: * * @li Executable attribute. * @li Cachable, bufferable and shareable attributes. * @li Cache policy. * @li Access permissions: Priviliged or User state, read or write access, * and combinations of all these. * * The MPU can be activated and deactivated with functions: * @verbatim * MPU_Enable(..); * MPU_Disable();@endverbatim * The MPU can control 8 memory regions with individual access control * settings. Section attributes and permissions are set with: * @verbatim * MPU_ConfigureRegion(..);@endverbatim * It is advisable to disable the MPU when altering region settings. * * * @{ ******************************************************************************/ /******************************************************************************* ************************** GLOBAL FUNCTIONS ******************************* ******************************************************************************/ /***************************************************************************//** * @brief * Configure an MPU region. * * @details * Writes to MPU RBAR and RASR registers. * Refer to Cortex-M3 Reference Manual, MPU chapter for further details. * To disable a region it is only required to set init->regionNo to the * desired value and init->regionEnable = false. * * @param[in] init * Pointer to a structure containing MPU region init information. ******************************************************************************/ void MPU_ConfigureRegion(const MPU_RegionInit_TypeDef *init) { EFM_ASSERT(init->regionNo < ((MPU->TYPE & MPU_TYPE_DREGION_Msk) >> MPU_TYPE_DREGION_Pos)); MPU->RNR = init->regionNo; if (init->regionEnable) { EFM_ASSERT(!(init->baseAddress & ~MPU_RBAR_ADDR_Msk)); EFM_ASSERT(init->tex <= 0x7); MPU->RBAR = init->baseAddress; MPU->RASR = ((init->disableExec ? 1 : 0) << MPU_RASR_XN_Pos) | (init->accessPermission << MPU_RASR_AP_Pos) | (init->tex << MPU_RASR_TEX_Pos) | ((init->shareable ? 1 : 0) << MPU_RASR_S_Pos) | ((init->cacheable ? 1 : 0) << MPU_RASR_C_Pos) | ((init->bufferable ? 1 : 0) << MPU_RASR_B_Pos) | (init->srd << MPU_RASR_SRD_Pos) | (init->size << MPU_RASR_SIZE_Pos) | (1 << MPU_RASR_ENABLE_Pos); } else { MPU->RBAR = 0; MPU->RASR = 0; } } /** @} (end addtogroup CMU) */ /** @} (end addtogroup emlib) */ #endif /* defined(__MPU_PRESENT) && (__MPU_PRESENT == 1) */