| /* |
| * Copyright (c) 2013-2014 Wind River Systems, Inc. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief ARM Cortex-M System Control Block interface |
| * |
| * |
| * Most of the SCB interface consists of simple bit-flipping methods, and is |
| * implemented as inline functions in scb.h. This module thus contains only data |
| * definitions and more complex routines, if needed. |
| */ |
| |
| #include <kernel.h> |
| #include <arch/cpu.h> |
| #include <sys/util.h> |
| #include <arch/arm/aarch32/cortex_m/cmsis.h> |
| #include <linker/linker-defs.h> |
| |
| #if defined(CONFIG_CPU_HAS_NXP_MPU) |
| #include <fsl_sysmpu.h> |
| #endif |
| |
| /** |
| * |
| * @brief Reset the system |
| * |
| * This routine resets the processor. |
| * |
| * @return N/A |
| */ |
| |
| void __weak sys_arch_reboot(int type) |
| { |
| ARG_UNUSED(type); |
| |
| NVIC_SystemReset(); |
| } |
| |
| #if defined(CONFIG_CPU_HAS_ARM_MPU) |
| /** |
| * |
| * @brief Clear all MPU region configuration |
| * |
| * This routine clears all ARM MPU region configuration. |
| * |
| * @return N/A |
| */ |
| void z_arm_clear_arm_mpu_config(void) |
| { |
| int i; |
| |
| int num_regions = |
| ((MPU->TYPE & MPU_TYPE_DREGION_Msk) >> MPU_TYPE_DREGION_Pos); |
| |
| for (i = 0; i < num_regions; i++) { |
| ARM_MPU_ClrRegion(i); |
| } |
| } |
| #elif CONFIG_CPU_HAS_NXP_MPU |
| void z_arm_clear_arm_mpu_config(void) |
| { |
| int i; |
| |
| int num_regions = FSL_FEATURE_SYSMPU_DESCRIPTOR_COUNT; |
| |
| SYSMPU_Enable(SYSMPU, false); |
| |
| /* NXP MPU region 0 is reserved for the debugger */ |
| for (i = 1; i < num_regions; i++) { |
| SYSMPU_RegionEnable(SYSMPU, i, false); |
| } |
| } |
| #endif /* CONFIG_CPU_HAS_NXP_MPU */ |
| |
| #if defined(CONFIG_INIT_ARCH_HW_AT_BOOT) |
| /** |
| * |
| * @brief Reset system control blocks and core registers |
| * |
| * This routine resets Cortex-M system control block |
| * components and core registers. |
| * |
| * @return N/A |
| */ |
| void z_arm_init_arch_hw_at_boot(void) |
| { |
| /* Disable interrupts */ |
| __disable_irq(); |
| |
| #if defined(CONFIG_ARMV7_M_ARMV8_M_MAINLINE) |
| __set_FAULTMASK(0); |
| #endif |
| |
| /* Initialize System Control Block components */ |
| |
| #if defined(CONFIG_CPU_HAS_ARM_MPU) || defined(CONFIG_CPU_HAS_NXP_MPU) |
| /* Clear MPU region configuration */ |
| z_arm_clear_arm_mpu_config(); |
| #endif /* CONFIG_CPU_HAS_ARM_MPU */ |
| |
| /* Disable NVIC interrupts */ |
| for (uint8_t i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) { |
| NVIC->ICER[i] = 0xFFFFFFFF; |
| } |
| /* Clear pending NVIC interrupts */ |
| for (uint8_t i = 0; i < ARRAY_SIZE(NVIC->ICPR); i++) { |
| NVIC->ICPR[i] = 0xFFFFFFFF; |
| } |
| |
| #if defined(CONFIG_CPU_CORTEX_M7) |
| /* Reset D-Cache settings. If the D-Cache was enabled, |
| * SCB_DisableDCache() takes care of cleaning and invalidating it. |
| * If it was already disabled, just call SCB_InvalidateDCache() to |
| * reset it to a known clean state. |
| */ |
| if (SCB->CCR & SCB_CCR_DC_Msk) { |
| SCB_DisableDCache(); |
| } else { |
| SCB_InvalidateDCache(); |
| } |
| /* Reset I-Cache settings. */ |
| SCB_DisableICache(); |
| #endif /* CONFIG_CPU_CORTEX_M7 */ |
| |
| /* Restore Interrupts */ |
| __enable_irq(); |
| |
| __DSB(); |
| __ISB(); |
| } |
| #endif /* CONFIG_INIT_ARCH_HW_AT_BOOT */ |