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ARMv8-A supports page sizes of 4k, 16k, and 64k. The specification permits implementations to choose which of these page sizes to implement. See the register ID
by rrss 6y ago
ARMv8-A supports page sizes of 4k, 16k, and 64k. The specification permits implementations to choose which of these page sizes to implement. See the register ID_AA64MMFR0_EL1.
- saagarjha 6y agoI'm not an expert, but I believe 4K support is required? Apple doesn't do that; they just have 16K granules (which I forsee as being problematic with compatibility as they bring these over to macOS).
- rrss 6y ago> I believe 4K support is required? As I said, I don't think that's the case. ARMv8-A supports the 3 page sizes and has a register so that implementations can advertise which are supported. > Armv8-A supports three different granule sizes: 4KB, 16KB, and 64KB. > The granule sizes that a processor supports are IMPLEMENTATION DEFINED and are reported by ID_AA64MMFR0_EL1 https://developer.arm.com/architectures/learn-the-architecture/memory-management/translation-granule https://developer.arm.com/architectures/learn-the-architectu...
- saagarjha 6y agoYou know I asked around recently and it seems to be that all three are now optional. Perhaps Apple has pushed for this, because I recall 4K and 64K support being a hard requirement.