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by masklinn
2485 days ago
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> Lastly isn't there a region of unmapable virtual address space on 64 bit in the middle of the virtual address space due to the chips which are doing mmap not handling full 64bit of virtual address space? Yes. ARM64 currently has a 48b address space split in two ranges (0 to 00007FFFFFFFFFFF and FFFF800000000000 to FFFFFFFFFFFFFFFF), ARMv8 requires 48b and allows 52 but apparently the sizes of the userspace and kernel regions are configurable (though limited by the chip aka you could reduce the size of the kernel space down from 48b but can't increase it). |
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