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46 AArch64 Linux memory layout with 64KB pages + 3 levels (52-bit with HW support)::
89 | [51:42] L1 index (52-bit)
103 52-bit VA support in the kernel
106 with a 64KB page size; then it is possible to use 52-bits of address
108 binary that supports 52-bit must also be able to fall back to 48-bit
112 higher addresses such that they are invariant to 48/52-bit VAs. Due
115 kernel VA space for both 48/52-bit. (Switching from 48-bit to 52-bit,
120 is kept constant at 0xFFF0000000000000 (corresponding to 52-bit),
125 As a single binary will need to support both 48-bit and 52-bit VA
126 spaces, the VMEMMAP must be sized large enough for 52-bit VAs and
144 52-bit userspace VAs
150 Software can "opt-in" to receiving VAs from a 52-bit space by
160 from a 52-bit space by enabling the following kernel config options: