diff options
Diffstat (limited to 'core/cortex-m/include/mpu.h')
| -rw-r--r-- | core/cortex-m/include/mpu.h | 52 |
1 files changed, 23 insertions, 29 deletions
diff --git a/core/cortex-m/include/mpu.h b/core/cortex-m/include/mpu.h index c3a632aff7..c0c595a367 100644 --- a/core/cortex-m/include/mpu.h +++ b/core/cortex-m/include/mpu.h @@ -20,39 +20,27 @@ #define MPU_CTRL_PRIVDEFEN (1 << 2) #define MPU_CTRL_HFNMIENA (1 << 1) #define MPU_CTRL_ENABLE (1 << 0) -#define MPU_ATTR_NX (1 << 12) -#define MPU_ATTR_NOACCESS (0 << 8) -#define MPU_ATTR_FULLACCESS (3 << 8) -/* Suggested in table 3-6 of Stellaris LM4F232H5QC Datasheet and table 38 of - * STM32F10xxx Cortex-M3 programming manual for internal sram. */ -#define MPU_ATTR_INTERNALSRAM 6 -/** - * Configure a region - * - * region: Number of the region to update - * addr: Base address of the region - * size: Size of the region in bytes - * attr: Attribute of the region. Current value will be overwritten if enable - * is set. - * enable: Enables the region if non zero. Otherwise, disables the region. - * - * Returns EC_SUCCESS on success or EC_ERROR_INVAL if a parameter is invalid. +/* + * XN (execute never) bit. It's bit 12 if accessed by halfword. + * 0: XN off + * 1: XN on */ -int mpu_config_region(uint8_t region, uint32_t addr, uint32_t size, - uint16_t attr, uint8_t enable); +#define MPU_ATTR_XN (1 << 12) -/** - * Set a region non-executable. - * - * region: number of the region - * addr: base address of the region - * size: size of the region in bytes - */ -int mpu_nx_region(uint8_t region, uint32_t addr, uint32_t size); +/* AP bit. See table 3-5 of Stellaris LM4F232H5QC datasheet for details */ +#define MPU_ATTR_NO_NO (0 << 8) /* previleged no access, unprev no access */ +#define MPU_ATTR_RW_RW (3 << 8) /* previleged ReadWrite, unprev ReadWrite */ +#define MPU_ATTR_RO_NO (5 << 8) /* previleged Read-only, unprev no access */ + +/* Suggested value for TEX S/C/B bit. See table 3-6 of Stellaris LM4F232H5QC + * datasheet and table 38 of STM32F10xxx Cortex-M3 programming manual. */ +#define MPU_ATTR_INTERNAL_SRAM 6 /* for Internal SRAM */ +#define MPU_ATTR_FLASH_MEMORY 2 /* for flash memory */ /** - * Enable MPU */ + * Enable MPU + */ void mpu_enable(void); /** @@ -70,11 +58,17 @@ extern char __iram_text_start; extern char __iram_text_end; /** - * Lock down RAM + * Protect RAM from code execution */ int mpu_protect_ram(void); /** + * Protect flash memory from code execution + */ +int mpu_lock_ro_flash(void); +int mpu_lock_rw_flash(void); + +/** * Initialize MPU. * It disables all regions if MPU is implemented. Otherwise, returns * EC_ERROR_UNIMPLEMENTED. |