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boot on an SoC that places physical memory at an address past where three levels of page tables can access in an identity mapping. Submitted by: Wojciech Macek <wma@semihalf.com>, Patrick Wildt <patrick@bitrig.org> Differential Revision: https://reviews.freebsd.org/D3885 (partial) Differential Revision: https://reviews.freebsd.org/D3744