1a4cb969d1
where the page table entry was previously invalid. (Note that I did not replace pmap_load_store() when it was followed by a TLB invalidation, even if we are not using the return value from pmap_load_store().) Correct an error in pmap_enter(). A test for determining when to set PGA_WRITEABLE was always true, even if the mapping was read only. In pmap_enter_l2(), when replacing an empty kernel page table page by a superpage mapping, clear the old l2 entry and issue a TLB invalidation. My reading of the ARM architecture manual leads me to believe that the TLB could hold an intermediate entry referencing the empty kernel page table page even though it contains no valid mappings. Replace a couple direct uses of atomic_clear_64() by the new pmap_clear_bits(). In a couple comments, replace the term "paging-structure caches", which is an Intel-specific term for the caches that hold intermediate entries in the page table, with wording that is more consistent with the ARM architecture manual. Reviewed by: markj X-MFC after: r350004 Differential Revision: https://reviews.freebsd.org/D20998
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