REGION IDENTIFYING OPERATION FOR IDENTIFYING A REGION OF A MEMORY ATTRIBUTE UNIT CORRESPONDING TO A TARGET MEMORY ADDRESS

摘要

A data processing apparatus has a memory attribute unit having storage regions for storing attribute data for controlling access to a corresponding memory address range by processing circuitry. In response to a target memory address, the processing circuitry can perform a region identifying operation to output a region identifying value identifying which of the storage regions 9 of the attribute unit corresponds to the target memory address. The region identifying value is made available to at least some software executed by the data processing apparatus. This can be useful for quickly checking access permissions of a range of addresses or for determining how to update the memory attribute unit.

主权项

1. A data processing apparatus comprising:
processing circuitry configured to perform data processing; a memory attribute unit comprising a plurality of storage regions, each storage region configured to store attribute data for controlling access to a corresponding memory address range by the processing circuitry; and wherein in response to a target memory address, the processing circuitry is configured to perform a region identifying operation to output a region identifying value for identifying which of said plurality of storage regions is a corresponding storage region indicated by the memory attribute unit as corresponding to a memory address range including said target memory address, wherein the target memory address is a physical address and the region identifying value is made available to at least some software executed by the data processing apparatus.