2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
5 #include <linux/module.h>
7 #include <linux/hugetlb.h>
8 #include <asm/cacheflush.h>
9 #include <asm/pgtable.h>
11 static pte_t *walk_page_table(unsigned long addr)
18 pgdp = pgd_offset_k(addr);
21 pudp = pud_offset(pgdp, addr);
24 pmdp = pmd_offset(pudp, addr);
25 if (pmd_none(*pmdp) || pmd_large(*pmdp))
27 ptep = pte_offset_kernel(pmdp, addr);
33 static void change_page_attr(unsigned long addr, int numpages,
39 for (i = 0; i < numpages; i++) {
40 ptep = walk_page_table(addr);
41 if (WARN_ON_ONCE(!ptep))
45 __ptep_ipte(addr, ptep);
51 int set_memory_ro(unsigned long addr, int numpages)
53 change_page_attr(addr, numpages, pte_wrprotect);
57 int set_memory_rw(unsigned long addr, int numpages)
59 change_page_attr(addr, numpages, pte_mkwrite);
64 int set_memory_nx(unsigned long addr, int numpages)
69 int set_memory_x(unsigned long addr, int numpages)