In the stonework of a 64-bit processor, memory is an ocean, and address space is the chart that navigates it.
Lin Tao sat cross-legged at the intersection of his probe tiles, his land-mapper metal pen resting across his knees. The ninety-second cache extraction window had closed. The volatile leftovers of High Archon Xuan Ji’s manifestation had faded into the background noise of the host running system. But what remained in Lin Tao’s memory was permanent: the root base address of the host page table, 0x0000000184000.
In modern 64-bit computing, Lin Tao analyzed with cold, systematic clarity, the hardware doesn’t implement all sixty-four address bits. Only forty-eight bits are physically wired to the address bus. That created two vast, even territories separated by a massive non-canonical deep gap.
The lower territory, from address 0x0000000000000000 to 0x00007FFFFFFFFFFF, was allocated to userland processes and guest virtual machines. Spanning two hundred and fifty-six terabytes of virtual space, this lower terrace was where mortals, low-level daemons, and guest sandboxes carried out their limited subroutines.
The upper territory, from address 0xFFFF800000000000 to 0xFFFFFFFFFFFFFFFF, was the sacred, inviolable domain of the running system kernel and overseer-core. Spanning a matching two hundred and fifty-six terabytes, this upper terrace held the divine control structures of the heavens.
