参照元

説明

引数

返り値

参考

実装

/*
 * maps a range of physical memory into the requested pages. the old
 * mappings are removed. any references to nonexistent pages results
 * in null mappings (currently treated as "copy-on-access")
 */
static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
                        unsigned long addr, unsigned long end,
                        unsigned long pfn, pgprot_t prot)
{
        pte_t *pte;
        spinlock_t *ptl;
        pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
        if (!pte)
                return -ENOMEM;
        arch_enter_lazy_mmu_mode();
        do {
                BUG_ON(!pte_none(*pte));
                set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot)));
                pfn++;
        } while (pte++, addr += PAGE_SIZE, addr != end);
        arch_leave_lazy_mmu_mode();
        pte_unmap_unlock(pte - 1, ptl);
        return 0;
}

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