diff options
Diffstat (limited to 'arch/powerpc/mm/pgtable_32.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 66 |
1 files changed, 42 insertions, 24 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index a9e4bfc025bc..65eda1997c3f 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -34,6 +34,7 @@ #include <asm/fixmap.h> #include <asm/io.h> #include <asm/setup.h> +#include <asm/sections.h> #include "mmu_decl.h" @@ -242,7 +243,7 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, int flags) /* * Map in a chunk of physical memory starting at start. */ -void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) +static void __init __mapin_ram_chunk(unsigned long offset, unsigned long top) { unsigned long v, s, f; phys_addr_t p; @@ -294,7 +295,7 @@ void __init mapin_ram(void) * Returns true (1) if PTE was found, zero otherwise. The pointer to * the PTE pointer is unmodified if PTE is not found. */ -int +static int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) { pgd_t *pgd; @@ -323,9 +324,7 @@ get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) return(retval); } -#ifdef CONFIG_DEBUG_PAGEALLOC - -static int __change_page_attr(struct page *page, pgprot_t prot) +static int __change_page_attr_noflush(struct page *page, pgprot_t prot) { pte_t *kpte; pmd_t *kpmd; @@ -339,8 +338,6 @@ static int __change_page_attr(struct page *page, pgprot_t prot) if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) return -EINVAL; __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); - wmb(); - flush_tlb_page(NULL, address); pte_unmap(kpte); return 0; @@ -349,44 +346,65 @@ static int __change_page_attr(struct page *page, pgprot_t prot) /* * Change the page attributes of an page in the linear mapping. * - * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY + * THIS DOES NOTHING WITH BAT MAPPINGS, DEBUG USE ONLY */ static int change_page_attr(struct page *page, int numpages, pgprot_t prot) { int i, err = 0; unsigned long flags; + struct page *start = page; local_irq_save(flags); for (i = 0; i < numpages; i++, page++) { - err = __change_page_attr(page, prot); + err = __change_page_attr_noflush(page, prot); if (err) break; } + wmb(); + flush_tlb_kernel_range((unsigned long)page_address(start), + (unsigned long)page_address(page)); local_irq_restore(flags); return err; } - -void __kernel_map_pages(struct page *page, int numpages, int enable) +void mark_initmem_nx(void) { - if (PageHighMem(page)) - return; + struct page *page = virt_to_page(_sinittext); + unsigned long numpages = PFN_UP((unsigned long)_einittext) - + PFN_DOWN((unsigned long)_sinittext); - change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); + change_page_attr(page, numpages, PAGE_KERNEL); } -#endif /* CONFIG_DEBUG_PAGEALLOC */ -static int fixmaps; - -void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags) +#ifdef CONFIG_STRICT_KERNEL_RWX +void mark_rodata_ro(void) { - unsigned long address = __fix_to_virt(idx); + struct page *page; + unsigned long numpages; + + page = virt_to_page(_stext); + numpages = PFN_UP((unsigned long)_etext) - + PFN_DOWN((unsigned long)_stext); - if (idx >= __end_of_fixed_addresses) { - BUG(); + change_page_attr(page, numpages, PAGE_KERNEL_ROX); + /* + * mark .rodata as read only. Use __init_begin rather than __end_rodata + * to cover NOTES and EXCEPTION_TABLE. + */ + page = virt_to_page(__start_rodata); + numpages = PFN_UP((unsigned long)__init_begin) - + PFN_DOWN((unsigned long)__start_rodata); + + change_page_attr(page, numpages, PAGE_KERNEL_RO); +} +#endif + +#ifdef CONFIG_DEBUG_PAGEALLOC +void __kernel_map_pages(struct page *page, int numpages, int enable) +{ + if (PageHighMem(page)) return; - } - map_kernel_page(address, phys, pgprot_val(flags)); - fixmaps++; + change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0)); } +#endif /* CONFIG_DEBUG_PAGEALLOC */ |