Query Hard Memory Addresses

[Kenneth Adam Miller]

So, previously it was discussed that /dev/mem could be used to mmap a
specific hardware memory into a process. Now I need to unit test some
userland code that does exactly that, but I need to make sure that the unit
test selects a small page that is always free in kernel land. How can I
query mem to just grab the location of a free page?

(my development setup is different from my other deployment; in deployment
these values are hard coded, in development they occur on a qemu emulator)
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