SECURITY DOMAIN PREDICTION

摘要

A data processing apparatus 2 supports operation in both a secure domain and a less secure domain. The secure domain has access to data that is not accessible when operating the less secure domain. Prediction circuitry 42 generates a domain prediction indicating whether a given processing action (such as a memory access) is to be performed in association with the secure domain or with the less secure domain. In this way, an appropriate set of memory permission data 34, 36 for controlling access by different privilege levels in the domains may be selected and applied by an appropriate memory protection unit. If the domain prediction is incorrect, then the processing is stalled and the given processing action retried.

主权项

1. A data processing apparatus comprising:
processing circuitry configured to perform data processing operations in response to program instructions, said processing circuitry having a plurality of domains of operation including a secure domain and a less secure domain, wherein when operating in said secure domain said processing circuitry has access to data that is not accessible when operating in said less secure domain; and prediction circuitry coupled to said processing circuitry and configured to generate a domain prediction predicting whether a given processing action to be performed by said processing circuitry should be performed associated with said secure domain or associated with said less secure domain, wherein said processing circuitry performs said given processing action based upon said domain prediction.