diff options
| -rw-r--r-- | arch/x86/mm/pageattr.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index 55f5b5cdb12e..c54832b75069 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -282,6 +282,45 @@ static int change_page_attr_addr(unsigned long address, pgprot_t prot) return err; } +static int __change_page_attr_set_clr(unsigned long addr, int numpages, + pgprot_t mask_set, pgprot_t mask_clr) +{ + pgprot_t new_prot; + int level; + pte_t *pte; + int i, ret; + + for (i = 0; i < numpages ; i++) { + + pte = lookup_address(addr, &level); + if (!pte) + return -EINVAL; + + new_prot = pte_pgprot(*pte); + + pgprot_val(new_prot) &= ~pgprot_val(mask_clr); + pgprot_val(new_prot) |= pgprot_val(mask_set); + + ret = change_page_attr_addr(addr, new_prot); + if (ret) + return ret; + addr += PAGE_SIZE; + } + + return 0; +} + +static int change_page_attr_set_clr(unsigned long addr, int numpages, + pgprot_t mask_set, pgprot_t mask_clr) +{ + int ret = __change_page_attr_set_clr(addr, numpages, mask_set, + mask_clr); + + global_flush_tlb(); + + return ret; +} + /** * change_page_attr_set - Change page table attributes in the linear mapping. * @addr: Virtual address in linear mapping. |