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 void change_page_attr(unsigned long addr, int numpages,
20 for (i = 0; i < numpages; i++) {
21 pgdp = pgd_offset(&init_mm, addr);
22 pudp = pud_offset(pgdp, addr);
23 pmdp = pmd_offset(pudp, addr);
24 if (pmd_huge(*pmdp)) {
28 ptep = pte_offset_kernel(pmdp, addr);
32 __ptep_ipte(addr, ptep);
38 int set_memory_ro(unsigned long addr, int numpages)
40 change_page_attr(addr, numpages, pte_wrprotect);
43 EXPORT_SYMBOL_GPL(set_memory_ro);
45 int set_memory_rw(unsigned long addr, int numpages)
47 change_page_attr(addr, numpages, pte_mkwrite);
50 EXPORT_SYMBOL_GPL(set_memory_rw);
53 int set_memory_nx(unsigned long addr, int numpages)
57 EXPORT_SYMBOL_GPL(set_memory_nx);
59 int set_memory_x(unsigned long addr, int numpages)