diff options
Diffstat (limited to 'core/cortex-m/include/mpu.h')
| -rw-r--r-- | core/cortex-m/include/mpu.h | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/core/cortex-m/include/mpu.h b/core/cortex-m/include/mpu.h index c0c595a367..bb5eaa4c7e 100644 --- a/core/cortex-m/include/mpu.h +++ b/core/cortex-m/include/mpu.h @@ -10,6 +10,26 @@ #include "common.h" +/* + * Region assignment. 7 as the highest, a higher index has a higher priority. + * For example, using 7 for .iram.text allows us to mark entire RAM XN except + * .iram.text, which is used for hibernation. + * Region assignment is currently wasteful and can be changed if more + * regions are needed in the future. For example, a second region may not + * be necessary for all types, and REGION_CODE_RAM / REGION_STORAGE can be + * made mutually exclusive. + */ +enum mpu_region { + REGION_DATA_RAM = 0, /* For internal data RAM */ + REGION_DATA_RAM2 = 1, /* Second region for unaligned size */ + REGION_CODE_RAM = 2, /* For internal code RAM */ + REGION_CODE_RAM2 = 3, /* Second region for unaligned size */ + REGION_STORAGE = 4, /* For mapped internal storage */ + REGION_STORAGE2 = 5, /* Second region for unaligned size */ + REGION_DATA_RAM_TEXT = 6, /* Exempt region of data RAM */ + REGION_CHIP_RESERVED = 7, /* Reserved for use in chip/ */ +}; + #define MPU_TYPE REG32(0xe000ed90) #define MPU_CTRL REG32(0xe000ed94) #define MPU_NUMBER REG32(0xe000ed98) @@ -60,10 +80,15 @@ extern char __iram_text_end; /** * Protect RAM from code execution */ -int mpu_protect_ram(void); +int mpu_protect_data_ram(void); + +/** + * Protect code RAM from being overwritten + */ +int mpu_protect_code_ram(void); /** - * Protect flash memory from code execution + * Protect internal mapped flash memory from code execution */ int mpu_lock_ro_flash(void); int mpu_lock_rw_flash(void); |