supervisor mode vs user mode for S32R274

adrianonea · ‎06-06-2017

The S32R274 manual section 61.1.1 Register access states that :

The ENET registers cannot be accessed in user mode until at least one supervisor-mode access is made to the ENET module.

What is a supervisor mode and what is a user mode? are they DRUN and RUN0-RUN3 that are configured via Mode Control Registers? Are they something else? Is there code sample on how to change between the modes?

davidtosenovjan · ‎06-07-2017

Hi, please pay attention to following training, page 15

e200 Core Training relevant to MPC55xx and MPC56xx device family

or you may see here

https://community.nxp.com/thread/358090

adrianonea · ‎06-07-2017

Thank you David,Can you please point me to the chapter in the S32R274 manual that describes the modes and associated registers that manage the modes?

I assume after a reset the system is in supervisory mode. Is that correct?

Will the startup code from D32DS change to user mode or is the system in supervisor mode when it enters "main"

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Re: supervisor mode vs user mode for S32R274

reply from David Tosenovjan in MPC5xxx - View the full discussionHi, please pay attention to following training, page 15e200 Core Training relevant to MPC55xx and MPC56xx device family or you may see hereHow to enter into supervisor mode and user mode in MPC5675K MCU?

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davidtosenovjan · ‎06-13-2017

By default it is in supervisor mode. Check core register MSR.

adrianonea · ‎06-14-2017

thank you David, I found that too but I was hoping there is more info somewhere else like what instructions/functions etc are available in each mode. However it does not matter now My software can stay in supervisor mode.do you have a MPC assembler manual?

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Re: supervisor mode vs user mode for S32R274

reply from David Tosenovjan in MPC5xxx - View the full discussion https://community.nxp.com/servlet/JiveServlet/downloadImage/2-913942-186598/pastedImage_2.png By default it is in supervisor mode. Check core register MSR.

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davidtosenovjan · ‎06-14-2017

It is following manual:

http://www.nxp.com/files-static/32bit/doc/ref_manual/EREF_RM.pdf

To simplify it - Supervisor/User mode is given by MSR[PR]. Some registers are accessible only in supervisor mode. It also affects accesses over MMU, MPU, XBAR and PBRIDGE where different access rights may be set for target access. This is needed to check.

adrianonea · ‎06-15-2017

Thank you very much David,This is the info I needed.

Regards,Adrian

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Re: supervisor mode vs user mode for S32R274

reply from David Tosenovjan in MPC5xxx - View the full discussionIt is following manual:http://www.nxp.com/files-static/32bit/doc/ref_manual/EREF_RM.pdf To simplify it - Supervisor/User mode is given by MSR[PR]. Some registers are accessible only in supervisor mode. It also affects accesses over MMU, MPU, XBAR and PBRIDGE where different access rights may be set for target access. This is needed to check.

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