Data processing apparatus and access control method

A data processing apparatus comprising:

• an operation unit;
• a processor that the operation unit accesses;
• an access controller configured to control access by the operation unit to the processor;
• and
• a permission configuration circuit configured to set accessibility of the operation unit to the processor, wherein
• the access controller includes an identifier table in which an intermediate identifier having an n-bit width where n is an integer and an access request identifier having a m-bit width where m is an integer greater than n are associated with each other,
• the permission configuration circuit stores permission configuration information including access permission configuration information configured for each intermediate identifier in such a way that the permission configuration information is associated with the processor,
• the operation unit outputs processor selection information, which is information regarding the processor that the operation unit accesses, and the access request identifier to the access controller,
• the access controller selects permission configuration information to be used for the access control using the processor selection information output from the operation unit,
• the access controller selects an identifier table to be used for the access control using the processor selection information output from the operation unit,
• the access controller determines the intermediate identifier that corresponds to the access request identifier output from the operation unit using the selected identifier table, and
• the access controller determines accessibility of the operation unit to the processor using the selected permission configuration information and the determined intermediate identifier.