Define values for MPU region setup.
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The following define values are used with ARM_MPU_RASR to setup the RASR value field in the MPU region.
- See Also
- ARM_MPU_Region_t, ARM_MPU_SetRegion, ARM_MPU_SetRegionEx.
| #define ARM_MPU_ACCESS_xxx |
The following define values are used to compose the access attributes for an MPU region:
| #define | TEX | Shareable | Cacheable | Bufferable | Description |
| ARM_MPU_ACCESS_ORDERED | 000b | 1 | 0 | 0 | Strongly ordered memory |
| ARM_MPU_ACCESS_DEVICE(S) | 0s0b | S | 0 | S | Memory mapped peripheral device, shared (S=1) or non-shared (S=0) |
| ARM_MPU_ACCESS_NORMAL(O,I,S) | 1BBb | S | A | A | Normal memory, with outer/inner cache policy (O/I=ARM_MPU_CACHEP_xxx, shared (S=1) or non-share (S=0) |
The following define values are used to compose the access permission for an MPU region:
| #define | Value | Access permissions |
| ARM_MPU_AP_NONE | 0x0U | None: any access generates a permission fault. |
| ARM_MPU_AP_PRIV | 0x1U | Privileged Read/Write: privileged access only; any unprivileged access generates a permission fault. |
| ARM_MPU_AP_URO | 0x2U | Privileged Read/Write; Unprivileged Read-only: any unprivileged write generates a permission fault. |
| ARM_MPU_AP_FULL | 0x3U | Privileged Read/Write. Unprivileged Read/Write: full access, permission faults are never generated. |
| ARM_MPU_AP_PRO | 0x5U | Privileged Read-only: any unprivileged access or privileged write generates a permission fault. |
| ARM_MPU_AP_RO | 0x6U | Privileged and Unprivileged Read-only: any write generates a permission fault. |
| #define ARM_MPU_CACHEP_xxx |
The following define values are used to compose the cacheability flags within the access attributes for an MPU region:
| #define | Value | Cacheability policy |
| ARM_MPU_CACHEP_NOCACHE | 00b | Non-cacheable |
| ARM_MPU_CACHEP_WB_WRA | 01b | Write-back, write and read allocate |
| ARM_MPU_CACHEP_WT_NWA | 10b | Write-through, no write allocate |
| ARM_MPU_CACHEP_WB_NWA | 11b | Write-back, no write allocate |
| #define ARM_MPU_REGION_SIZE_xxx |
The following define values are used to compose the size information for an MPU region:
| #define | Value | Description |
| ARM_MPU_REGION_SIZE_32B | 0x04U | Region size 32 Bytes |
| ARM_MPU_REGION_SIZE_64B | 0x05U | Region size 64 Bytes |
| ARM_MPU_REGION_SIZE_128B | 0x06U | Region size 128 Bytes |
| ARM_MPU_REGION_SIZE_256B | 0x07U | Region size 256 Bytes |
| ARM_MPU_REGION_SIZE_512B | 0x08U | Region size 512 Bytes |
| ARM_MPU_REGION_SIZE_1KB | 0x09U | Region size 1 KByte |
| ARM_MPU_REGION_SIZE_2KB | 0x0AU | Region size 2 KBytes |
| ARM_MPU_REGION_SIZE_4KB | 0x0BU | Region size 4 KBytes |
| ARM_MPU_REGION_SIZE_8KB | 0x0CU | Region size 8 KBytes |
| ARM_MPU_REGION_SIZE_16KB | 0x0DU | Region size 16 KBytes |
| ARM_MPU_REGION_SIZE_32KB | 0x0EU | Region size 32 KBytes |
| ARM_MPU_REGION_SIZE_64KB | 0x0FU | Region size 64 KBytes |
| ARM_MPU_REGION_SIZE_128KB | 0x10U | Region size 128 KBytes |
| ARM_MPU_REGION_SIZE_256KB | 0x11U | Region size 256 KBytes |
| ARM_MPU_REGION_SIZE_512KB | 0x12U | Region size 512 KBytes |
| ARM_MPU_REGION_SIZE_1MB | 0x13U | Region size 1 MByte |
| ARM_MPU_REGION_SIZE_2MB | 0x14U | Region size 2 MBytes |
| ARM_MPU_REGION_SIZE_4MB | 0x15U | Region size 4 MBytes |
| ARM_MPU_REGION_SIZE_8MB | 0x16U | Region size 8 MBytes |
| ARM_MPU_REGION_SIZE_16MB | 0x17U | Region size 16 MBytes |
| ARM_MPU_REGION_SIZE_32MB | 0x18U | Region size 32 MBytes |
| ARM_MPU_REGION_SIZE_64MB | 0x19U | Region size 64 MBytes |
| ARM_MPU_REGION_SIZE_128MB | 0x1AU | Region size 128 MBytes |
| ARM_MPU_REGION_SIZE_256MB | 0x1BU | Region size 256 MBytes |
| ARM_MPU_REGION_SIZE_512MB | 0x1CU | Region size 512 MBytes |
| ARM_MPU_REGION_SIZE_1GB | 0x1DU | Region size 1 GByte |
| ARM_MPU_REGION_SIZE_2GB | 0x1EU | Region size 2 GBytes |
| ARM_MPU_REGION_SIZE_4GB | 0x1FU | Region size 4 GBytes |
