Struct El1Mpu 

pub struct El1Mpu();

Represents our PMSAv8-32 EL1 MPU

Implementations

impl El1Mpu

pub unsafe fn new() -> El1Mpu

Create an MPU handle

Safety

Only create one of these at any given time, as they access shared mutable state within the processor and do read-modify-writes on that state.

pub fn num_regions(&self) -> u8

How many MPU regions are there?

pub fn get_region(&mut self, idx: u8) -> Option<El1Region>

Access the current state of a region

pub fn set_region(&mut self, idx: u8, region: &El1Region) -> Result<(), Error>

Write a single region to the EL1 MPU

Arguments

• region: The El1Region object containing the configuration for the MPU region.
• idx: The index of the region to be configured.

Errors

Returns:

• Error::UnalignedRegion if the region’s start address is not 64-byte aligned.
• Error::UnalignedRegion if the region’s end address is not 63-byte aligned.
• Error::InvalidMair if the region’s MAIR index is invalid (greater than 7).

pub fn set_regions( &mut self, regions_starting_idx: u8, regions: &[El1Region], ) -> Result<(), Error>

Writes a subset of EL1 MPU regions starting from a specified index.

Arguments

• regions_starting_idx: The starting index for the regions to be reconfigured.
• regions: A slice of El1Region objects that will overwrite the previous regions starting from regions_starting_idx.

pub fn set_attributes(&mut self, memattrs: &[MemAttr])

Set the memory attributes to MAIR0 and MAIR1

pub fn background_region_enable(&mut self, enable: bool)

Enable or disable the background region

pub fn configure(&mut self, config: &El1Config<'_>) -> Result<(), Error>

Configure the EL1 MPU

Write regions, attributes and enable/disable the background region with a single El1Config struct.

pub fn enable(&mut self)

Enable the EL1 MPU

pub fn disable(&mut self)

Disable the EL1 MPU