Accession already allocated arrays

Hello,

My question is simple, how can I obtain a MACPTR to array data? For usual
data type it's easy from the documentation but for arrays I do not know how.

I’m adding code to FriCAS (0), a fork of Axiom (1), and the creation of
arrays I’ll use is already implemented. I just need to have direct access
to memory, so, in C, an address to the data stored in Clozure CL arrays.

I insist, FriCAS arrays are already implemented, I do not want to use
(make-heap-ivector …) for example.

Regards,

Greg

(0): https://fricas.github.io/
(1): http ://axiom-developer.org/