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stm32/mpu: Define the last used MPU region number. 

The reason for this change is that it makes allows custom code, that needs
to use an MPU region, to find a free one by using this macro or starting
from the max number and downwards, without concern that it might change in
the future.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This commit is contained in:
iabdalkader 2024-07-20 10:37:26 +03:00 committed by Damien George
parent bc7e39d549
commit 9a48ce3051
1 changed files with 8 additions and 1 deletions
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9
ports/stm32/mpu.h
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@ -36,12 +36,18 @@
#define MPU_REGION_QSPI3 (MPU_REGION_NUMBER3)
#define MPU_REGION_SDRAM1 (MPU_REGION_NUMBER4)
#define MPU_REGION_SDRAM2 (MPU_REGION_NUMBER5)
#define MPU_REGION_OPENAMP (MPU_REGION_NUMBER15)
// Only relevant on CPUs with D-Cache, must be higher priority than SDRAM
#define MPU_REGION_DMA_UNCACHED_1 (MPU_REGION_NUMBER6)
#define MPU_REGION_DMA_UNCACHED_2 (MPU_REGION_NUMBER7)
#ifdef MPU_REGION_NUMBER8
#define MPU_REGION_OPENAMP (MPU_REGION_NUMBER8)
#define MPU_REGION_LAST_USED (MPU_REGION_NUMBER8)
#else
#define MPU_REGION_LAST_USED (MPU_REGION_NUMBER7)
#endif
// Attribute value to disable a region entirely, remove it from the MPU
// (i.e. the MPU_REGION_ENABLE bit is unset.)
#define MPU_CONFIG_DISABLE 0
@ -135,6 +141,7 @@ static inline void mpu_config_end(uint32_t irq_state) {
#define MPU_REGION_SIG (MPU_REGION_NUMBER0)
#define MPU_REGION_ETH (MPU_REGION_NUMBER1)
#define MPU_REGION_LAST_USED (MPU_REGION_NUMBER1)
#define ST_DEVICE_SIGNATURE_BASE (0x08fff800)
#define ST_DEVICE_SIGNATURE_LIMIT (0x08ffffff)