la57 kernel support is required. we simply add a 5th level and enable the cr4 feature. the safemode option "256tb_memory_limit" is named after the 4gb one, but the current support is limited to 512GB as before (this can be later extended). Change-Id: I922774473c4a6112a0e4ff74162285ad58aa53af Reviewed-on: https://review.haiku-os.org/c/haiku/+/3552 Reviewed-by: Adrien Destugues <[email protected]> Reviewed-by: Axel Dörfler <[email protected]>