projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 305b1523 JG |
1 | /* |
| 2 | * Copyright IBM Corp. 2011 | |
| 3 | * Author(s): Jan Glauber <jang@linux.vnet.ibm.com> | |
| 4 | */ | |
| 5 | #include <linux/module.h> | |
| 6 | #include <linux/mm.h> | |
| 7 | #include <linux/hugetlb.h> | |
| 8 | #include <asm/pgtable.h> | |
| 9 | ||
| 10 | static void change_page_attr(unsigned long addr, int numpages, | |
| 11 | pte_t (*set) (pte_t)) | |
| 12 | { | |
| 13 | pte_t *ptep, pte; | |
| 14 | pmd_t *pmdp; | |
| 15 | pud_t *pudp; | |
| 16 | pgd_t *pgdp; | |
| 17 | int i; | |
| 18 | ||
| 19 | for (i = 0; i < numpages; i++) { | |
| 20 | pgdp = pgd_offset(&init_mm, addr); | |
| 21 | pudp = pud_offset(pgdp, addr); | |
| 22 | pmdp = pmd_offset(pudp, addr); | |
| 23 | if (pmd_huge(*pmdp)) { | |
| 24 | WARN_ON_ONCE(1); | |
| 25 | continue; | |
| 26 | } | |
| e4c031b4 | 27 | ptep = pte_offset_kernel(pmdp, addr); |
| 305b1523 JG |
28 | |
| 29 | pte = *ptep; | |
| 30 | pte = set(pte); | |
| e4c031b4 | 31 | ptep_invalidate(&init_mm, addr, ptep); |
| 305b1523 | 32 | *ptep = pte; |
| e4c031b4 | 33 | addr += PAGE_SIZE; |
| 305b1523 JG |
34 | } |
| 35 | } | |
| 36 | ||
| 37 | int set_memory_ro(unsigned long addr, int numpages) | |
| 38 | { | |
| 39 | change_page_attr(addr, numpages, pte_wrprotect); | |
| 40 | return 0; | |
| 41 | } | |
| 42 | EXPORT_SYMBOL_GPL(set_memory_ro); | |
| 43 | ||
| 44 | int set_memory_rw(unsigned long addr, int numpages) | |
| 45 | { | |
| 46 | change_page_attr(addr, numpages, pte_mkwrite); | |
| 47 | return 0; | |
| 48 | } | |
| 49 | EXPORT_SYMBOL_GPL(set_memory_rw); | |
| 50 | ||
| 51 | /* not possible */ | |
| 52 | int set_memory_nx(unsigned long addr, int numpages) | |
| 53 | { | |
| 54 | return 0; | |
| 55 | } | |
| 56 | EXPORT_SYMBOL_GPL(set_memory_nx); |