How to define user or superivor modes of operation?

Hello,

       I'm using the dsp of  C6747.I know DSP allows the operating system to give a basic level of protection to sensitive resources and Local memory is divided into multiple pages, each with read, write, and execute permissions.

        Now i want to define the size of  the L1P, L1D,L2  cache.But  L1P Cache Control Registers such as  L1PCFG( Level 1 Program Configuration Register) need the Permissions of Supervisor mode ,because supervisor mode can be Read and Write , User mode only can be Read.

       Can you tell me how to define user or superivor modes of operation?which register can be used?

      THANK YOU !