Prepare for a larger kernel virtual address space.  Specifically, once KERNBASE and VM_MIN_KERNEL_ADDRESS are no longer the same, the physical memory allocated during bootstrap will be offset from the low-end of the kernel's page table.
Prepare for a larger kernel virtual address space.  Specifically, once
KERNBASE and VM_MIN_KERNEL_ADDRESS are no longer the same, the physical
memory allocated during bootstrap will be offset from the low-end of the
kernel's page table.

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