Linux 下获取某虚拟地址对应的页表信息

即给出某个虚拟地址，通过查询页表信息，将其转换成物理地址。

 

//该函数用于查询address对应的页表。摘自arch/x86/mm/fault.c static void dump_pagetable(unsigned long address) {        pgd_t *base = __va(read_cr3() & PHYSICAL_PAGE_MASK); //页目录表基址        pgd_t *pgd = base + pgd_index(address);        pud_t *pud;           // 页表级数大于 3        pmd_t *pmd;         // 页表级数大于 2        pte_t *pte;          if (bad_address(pgd))               goto bad;          printk("PGD %lx ", pgd_val(*pgd));          if (!pgd_present(*pgd))               goto out;          pud = pud_offset(pgd, address);        if (bad_address(pud))               goto bad;          printk("PUD %lx ", pud_val(*pud));        if (!pud_present(*pud) || pud_large(*pud))               goto out;          pmd = pmd_offset(pud, address);        if (bad_address(pmd))               goto bad;          printk("PMD %lx ", pmd_val(*pmd));        if (!pmd_present(*pmd) || pmd_large(*pmd))               goto out;          pte = pte_offset_kernel(pmd, address);        if (bad_address(pte))               goto bad;          printk("PTE %lx", pte_val(*pte)); out:        printk("/n");        return; bad:        printk("BAD/n"); }

 之后转换成物理地址： pa = (pte_val(*pte) & PAGE_MASK | (address & ~PAGE_MASK);