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+only the first 32GiB of physical memory are considered. this can be changed
+with pram_pages in paging.cpp. as for virtual memory, the top 1GiB is reserved
+for the kernel. the top 1MiB of that is reserved for the kernel stack, with an
+unmapped guard page at the top and bottom of the kernel stack.
+
+if any of these facts change, the linker script and paging code should be
+checked closely.