It's not really a question of whether or not it's feasible, but rather: If the hardware were supports such operations, would they be expressible within the language? If they are, then we should point at the accessibility of the functionality rather than C.

In this case, I could definitely see `set_cache_behavior(ptr, len, options)` being perfectly reasonable, so I'd argue that, again, the fact that we can't do it is more a property of the environment than the language itself.