indicator for A core system timer implemented or not

Hi ARM expert,

    In ARM V7 RM, I saw "This chapter describes the implementation of the ARM Generic Timer as an OPTIONAL extension to an ARMv7-A or ARMv7-R processor implementation.". So, I think it means that a SoC implementation can choice to involve the system timer or not.


    My question is how software can get the information about if the system timer is implemented or not at run time?

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