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arm/armv[7|8]-m: add syn barrier for MPU ops

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Execute data and instruction sync barriers after writing MPU register,
to ensure MPU setting take effects that the new changes are seen.

testing in lm3s6965-ek:qemu-protected

Signed-off-by: fangxinyong <fangxinyong@xiaomi.com>
This commit is contained in:
fangxinyong 2024-01-23 17:36:06 +08:00 committed by Xiang Xiao
parent 1e29b8de1d
commit 13cb355a4e
2 changed files with 28 additions and 0 deletions
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14
arch/arm/src/armv7-m/arm_mpu.c
View File

@ -29,6 +29,7 @@
#include "mpu.h"
#include "arm_internal.h"
#include "barriers.h"
/****************************************************************************
* Pre-processor Definitions
@ -201,6 +202,9 @@ static void mpu_reset_internal()
}
putreg32(0, MPU_CTRL);
ARM_DSB();
ARM_ISB();
}
#endif
@ -356,6 +360,11 @@ void mpu_control(bool enable, bool hfnmiena, bool privdefena)
}
putreg32(regval, MPU_CTRL);
/* Ensure MPU setting take effects */
ARM_DSB();
ARM_ISB();
}
/****************************************************************************
@ -413,6 +422,11 @@ void mpu_configure_region(uintptr_t base, size_t size,
((uint32_t)subregions << MPU_RASR_SRD_SHIFT) | /* Sub-regions */
flags;
putreg32(regval, MPU_RASR);
/* Ensure MPU setting take effects */
ARM_DSB();
ARM_ISB();
}
/****************************************************************************

14
arch/arm/src/armv8-m/arm_mpu.c
View File

@ -29,6 +29,7 @@
#include "mpu.h"
#include "arm_internal.h"
#include "barriers.h"
/****************************************************************************
* Pre-processor Definitions
@ -95,6 +96,9 @@ static void mpu_reset_internal()
}
putreg32(0, MPU_CTRL);
ARM_DSB();
ARM_ISB();
}
#endif
@ -139,6 +143,11 @@ void mpu_control(bool enable, bool hfnmiena, bool privdefena)
}
putreg32(regval, MPU_CTRL);
/* Ensure MPU setting take effects */
ARM_DSB();
ARM_ISB();
}
/****************************************************************************
@ -174,6 +183,11 @@ void mpu_configure_region(uintptr_t base, size_t size,
putreg32(base | flags1, MPU_RBAR);
putreg32(limit | flags2 | MPU_RLAR_ENABLE, MPU_RLAR);
/* Ensure MPU setting take effects */
ARM_DSB();
ARM_ISB();
}
/****************************************************************************