diff options
Diffstat (limited to 'arch/riscv/mm/pageattr.c')
| -rw-r--r-- | arch/riscv/mm/pageattr.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index 19fecb362d81..5e49e4b4a4cc 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -128,6 +128,12 @@ static int __set_memory(unsigned long addr, int numpages, pgprot_t set_mask, return ret; } +int set_memory_rw_nx(unsigned long addr, int numpages) +{ + return __set_memory(addr, numpages, __pgprot(_PAGE_READ | _PAGE_WRITE), + __pgprot(_PAGE_EXEC)); +} + int set_memory_ro(unsigned long addr, int numpages) { return __set_memory(addr, numpages, __pgprot(_PAGE_READ), @@ -184,6 +190,7 @@ int set_direct_map_default_noflush(struct page *page) return ret; } +#ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { if (!debug_pagealloc_enabled()) @@ -196,3 +203,33 @@ void __kernel_map_pages(struct page *page, int numpages, int enable) __set_memory((unsigned long)page_address(page), numpages, __pgprot(0), __pgprot(_PAGE_PRESENT)); } +#endif + +bool kernel_page_present(struct page *page) +{ + unsigned long addr = (unsigned long)page_address(page); + pgd_t *pgd; + pud_t *pud; + p4d_t *p4d; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_offset_k(addr); + if (!pgd_present(*pgd)) + return false; + + p4d = p4d_offset(pgd, addr); + if (!p4d_present(*p4d)) + return false; + + pud = pud_offset(p4d, addr); + if (!pud_present(*pud)) + return false; + + pmd = pmd_offset(pud, addr); + if (!pmd_present(*pmd)) + return false; + + pte = pte_offset_kernel(pmd, addr); + return pte_present(*pte); +} |