return pte;
}
+unsigned long hugetlb_mask_last_page(struct hstate *h)
+{
+ unsigned long hp_size = huge_page_size(h);
+
+ switch (hp_size) {
+#ifndef __PAGETABLE_PMD_FOLDED
+ case PUD_SIZE:
+ return P4D_SIZE - PUD_SIZE;
+#endif
+ case PMD_SIZE:
+ return PUD_SIZE - PMD_SIZE;
+ case napot_cont_size(NAPOT_CONT64KB_ORDER):
+ return PMD_SIZE - napot_cont_size(NAPOT_CONT64KB_ORDER);
+ default:
+ break;
+ }
+
+ return 0UL;
+}
+
static pte_t get_clear_contig(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
return entry;
}
+static void clear_flush(struct mm_struct *mm,
+ unsigned long addr,
+ pte_t *ptep,
+ unsigned long pgsize,
+ unsigned long ncontig)
+{
+ struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
+ unsigned long i, saddr = addr;
+
+ for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
+ ptep_get_and_clear(mm, addr, ptep);
+
+ flush_tlb_range(&vma, saddr, addr);
+}
+
+/*
+ * When dealing with NAPOT mappings, the privileged specification indicates that
+ * "if an update needs to be made, the OS generally should first mark all of the
+ * PTEs invalid, then issue SFENCE.VMA instruction(s) covering all 4 KiB regions
+ * within the range, [...] then update the PTE(s), as described in Section
+ * 4.2.1.". That's the equivalent of the Break-Before-Make approach used by
+ * arm64.
+ */
void set_huge_pte_at(struct mm_struct *mm,
unsigned long addr,
pte_t *ptep,
pte_t pte,
unsigned long sz)
{
+ unsigned long hugepage_shift, pgsize;
int i, pte_num;
+ if (sz >= PGDIR_SIZE)
+ hugepage_shift = PGDIR_SHIFT;
+ else if (sz >= P4D_SIZE)
+ hugepage_shift = P4D_SHIFT;
+ else if (sz >= PUD_SIZE)
+ hugepage_shift = PUD_SHIFT;
+ else if (sz >= PMD_SIZE)
+ hugepage_shift = PMD_SHIFT;
+ else
+ hugepage_shift = PAGE_SHIFT;
+
+ pte_num = sz >> hugepage_shift;
+ pgsize = 1 << hugepage_shift;
+
+ if (!pte_present(pte)) {
+ for (i = 0; i < pte_num; i++, ptep++, addr += pgsize)
+ set_ptes(mm, addr, ptep, pte, 1);
+ return;
+ }
+
if (!pte_napot(pte)) {
- set_pte_at(mm, addr, ptep, pte);
+ set_ptes(mm, addr, ptep, pte, 1);
return;
}
- pte_num = napot_pte_num(napot_cont_order(pte));
- for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
+ clear_flush(mm, addr, ptep, pgsize, pte_num);
+
+ for (i = 0; i < pte_num; i++, ptep++, addr += pgsize)
set_pte_at(mm, addr, ptep, pte);
}