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Add support for 16 MPU regions to Cortex-M4 MPU ports (#96)

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ARMv7-M supports 8 or 16 MPU regions. FreeRTOS Cortex-M4 MPU ports so
far assumed 8 regions. This change adds support for 16 MPU regions. The
hardware with 16 MPU regions must define configTOTAL_MPU_REGIONS to 16
in their FreeRTOSConfig.h.

If left undefined, it defaults to 8 for backward compatibility.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav-Aggarwal-AWS 2020-07-24 07:47:41 -07:00 • committed by GitHub
parent 367faab135
commit 7dd6b76011
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 167 additions and 98 deletions
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8
portable/IAR/ARM_CM4F_MPU/port.c
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@ -76,7 +76,7 @@
#define portMPU_REGION_BASE_ADDRESS_REG ( *( ( volatile uint32_t * ) 0xe000ed9C ) )
#define portMPU_REGION_ATTRIBUTE_REG ( *( ( volatile uint32_t * ) 0xe000edA0 ) )
#define portMPU_CTRL_REG ( *( ( volatile uint32_t * ) 0xe000ed94 ) )
#define portEXPECTED_MPU_TYPE_VALUE ( 8UL << 8UL ) /* 8 regions, unified. */
#define portEXPECTED_MPU_TYPE_VALUE ( portTOTAL_NUM_REGIONS << 8UL )
#define portMPU_ENABLE ( 0x01UL )
#define portMPU_BACKGROUND_ENABLE ( 1UL << 2UL )
#define portPRIVILEGED_EXECUTION_START_ADDRESS ( 0UL )
@ -527,6 +527,12 @@ static void prvSetupMPU( void )
extern uint32_t __privileged_data_start__[];
extern uint32_t __privileged_data_end__[];
/* The only permitted number of regions are 8 or 16. */
configASSERT( ( portTOTAL_NUM_REGIONS == 8 ) || ( portTOTAL_NUM_REGIONS == 16 ) );
/* Ensure that the configTOTAL_MPU_REGIONS is configured correctly. */
configASSERT( portMPU_TYPE_REG == portEXPECTED_MPU_TYPE_VALUE );
/* Check the expected MPU is present. */
if( portMPU_TYPE_REG == portEXPECTED_MPU_TYPE_VALUE )
{