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If you really insist on shooting yourself in the foot, you can do MemorySegment.ofAddress(0).reinterpret(Long.MAX_VALUE) to obtain a MemorySegment for the lower half of the address space of your process. Obviously, you set the address to Long.MAX_VALUE for the upper half.

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Unfortunately, unless the JIT can prove that the address you are accessing via the segment is non-negative, it can't elide the bounds check. See https://mail.openjdk.org/pipermail/panama-dev/2023-July/0194... for a bit more information.

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