hermit-os / hermit-os/kernel

Minimize TLB pressure

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Description

We are currently identity-mapping using these page sizes:

| Architecture | Page Size |
| ------------- | ---------:|
| AArch64 | 4 KiB |
| 64-bit RISC-V | 1 GiB |
| x86-64 | 2 MiB |

It would be good to use the larges page size possible on each architecture instead.
This would make the memory layout simpler while minimizing TLB pressure.

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