| /* |
| * Copyright (C) 2012 ARM Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| #ifndef __ASM_PGTABLE_H |
| #define __ASM_PGTABLE_H |
| |
| #include <asm/bug.h> |
| #include <asm/proc-fns.h> |
| |
| #include <asm/memory.h> |
| #include <asm/pgtable-hwdef.h> |
| #include <asm/pgtable-prot.h> |
| |
| /* |
| * VMALLOC range. |
| * |
| * VMALLOC_START: beginning of the kernel vmalloc space |
| * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space |
| * and fixed mappings |
| */ |
| #define VMALLOC_START (MODULES_END) |
| #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) |
| |
| #define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT)) |
| |
| #define FIRST_USER_ADDRESS 0UL |
| |
| #ifndef __ASSEMBLY__ |
| |
| #include <asm/fixmap.h> |
| #include <linux/mmdebug.h> |
| |
| extern void __pte_error(const char *file, int line, unsigned long val); |
| extern void __pmd_error(const char *file, int line, unsigned long val); |
| extern void __pud_error(const char *file, int line, unsigned long val); |
| extern void __pgd_error(const char *file, int line, unsigned long val); |
| |
| /* |
| * ZERO_PAGE is a global shared page that is always zero: used |
| * for zero-mapped memory areas etc.. |
| */ |
| extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; |
| #define ZERO_PAGE(vaddr) pfn_to_page(PHYS_PFN(__pa(empty_zero_page))) |
| |
| #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) |
| |
| #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) |
| |
| #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) |
| |
| #define pte_none(pte) (!pte_val(pte)) |
| #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) |
| #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) |
| |
| /* |
| * The following only work if pte_present(). Undefined behaviour otherwise. |
| */ |
| #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) |
| #define pte_young(pte) (!!(pte_val(pte) & PTE_AF)) |
| #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL)) |
| #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE)) |
| #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) |
| #define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT)) |
| #define pte_user(pte) (!!(pte_val(pte) & PTE_USER)) |
| |
| #ifdef CONFIG_ARM64_HW_AFDBM |
| #define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY)) |
| #else |
| #define pte_hw_dirty(pte) (0) |
| #endif |
| #define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) |
| #define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte)) |
| |
| #define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID)) |
| #define pte_valid_not_user(pte) \ |
| ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID) |
| #define pte_valid_young(pte) \ |
| ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF)) |
| |
| /* |
| * Could the pte be present in the TLB? We must check mm_tlb_flush_pending |
| * so that we don't erroneously return false for pages that have been |
| * remapped as PROT_NONE but are yet to be flushed from the TLB. |
| */ |
| #define pte_accessible(mm, pte) \ |
| (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte)) |
| |
| static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) |
| { |
| pte_val(pte) &= ~pgprot_val(prot); |
| return pte; |
| } |
| |
| static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) |
| { |
| pte_val(pte) |= pgprot_val(prot); |
| return pte; |
| } |
| |
| static inline pte_t pte_wrprotect(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(PTE_WRITE)); |
| } |
| |
| static inline pte_t pte_mkwrite(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(PTE_WRITE)); |
| } |
| |
| static inline pte_t pte_mkclean(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(PTE_DIRTY)); |
| } |
| |
| static inline pte_t pte_mkdirty(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(PTE_DIRTY)); |
| } |
| |
| static inline pte_t pte_mkold(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(PTE_AF)); |
| } |
| |
| static inline pte_t pte_mkyoung(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(PTE_AF)); |
| } |
| |
| static inline pte_t pte_mkspecial(pte_t pte) |
| { |
| return set_pte_bit(pte, __pgprot(PTE_SPECIAL)); |
| } |
| |
| static inline pte_t pte_mkcont(pte_t pte) |
| { |
| pte = set_pte_bit(pte, __pgprot(PTE_CONT)); |
| return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE)); |
| } |
| |
| static inline pte_t pte_mknoncont(pte_t pte) |
| { |
| return clear_pte_bit(pte, __pgprot(PTE_CONT)); |
| } |
| |
| static inline pmd_t pmd_mkcont(pmd_t pmd) |
| { |
| return __pmd(pmd_val(pmd) | PMD_SECT_CONT); |
| } |
| |
| static inline void set_pte(pte_t *ptep, pte_t pte) |
| { |
| *ptep = pte; |
| |
| /* |
| * Only if the new pte is valid and kernel, otherwise TLB maintenance |
| * or update_mmu_cache() have the necessary barriers. |
| */ |
| if (pte_valid_not_user(pte)) { |
| dsb(ishst); |
| isb(); |
| } |
| } |
| |
| struct mm_struct; |
| struct vm_area_struct; |
| |
| extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); |
| |
| /* |
| * PTE bits configuration in the presence of hardware Dirty Bit Management |
| * (PTE_WRITE == PTE_DBM): |
| * |
| * Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw) |
| * 0 0 | 1 0 0 |
| * 0 1 | 1 1 0 |
| * 1 0 | 1 0 1 |
| * 1 1 | 0 1 x |
| * |
| * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via |
| * the page fault mechanism. Checking the dirty status of a pte becomes: |
| * |
| * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY) |
| */ |
| static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pte) |
| { |
| if (pte_present(pte)) { |
| if (pte_sw_dirty(pte) && pte_write(pte)) |
| pte_val(pte) &= ~PTE_RDONLY; |
| else |
| pte_val(pte) |= PTE_RDONLY; |
| if (pte_user(pte) && pte_exec(pte) && !pte_special(pte)) |
| __sync_icache_dcache(pte, addr); |
| } |
| |
| /* |
| * If the existing pte is valid, check for potential race with |
| * hardware updates of the pte (ptep_set_access_flags safely changes |
| * valid ptes without going through an invalid entry). |
| */ |
| if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM) && |
| pte_valid(*ptep) && pte_valid(pte)) { |
| VM_WARN_ONCE(!pte_young(pte), |
| "%s: racy access flag clearing: 0x%016llx -> 0x%016llx", |
| __func__, pte_val(*ptep), pte_val(pte)); |
| VM_WARN_ONCE(pte_write(*ptep) && !pte_dirty(pte), |
| "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx", |
| __func__, pte_val(*ptep), pte_val(pte)); |
| } |
| |
| set_pte(ptep, pte); |
| } |
| |
| /* |
| * Huge pte definitions. |
| */ |
| #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) |
| #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) |
| |
| /* |
| * Hugetlb definitions. |
| */ |
| #define HUGE_MAX_HSTATE 4 |
| #define HPAGE_SHIFT PMD_SHIFT |
| #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) |
| #define HPAGE_MASK (~(HPAGE_SIZE - 1)) |
| #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) |
| |
| #define __HAVE_ARCH_PTE_SPECIAL |
| |
| static inline pte_t pud_pte(pud_t pud) |
| { |
| return __pte(pud_val(pud)); |
| } |
| |
| static inline pmd_t pud_pmd(pud_t pud) |
| { |
| return __pmd(pud_val(pud)); |
| } |
| |
| static inline pte_t pmd_pte(pmd_t pmd) |
| { |
| return __pte(pmd_val(pmd)); |
| } |
| |
| static inline pmd_t pte_pmd(pte_t pte) |
| { |
| return __pmd(pte_val(pte)); |
| } |
| |
| static inline pgprot_t mk_sect_prot(pgprot_t prot) |
| { |
| return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT); |
| } |
| |
| #ifdef CONFIG_NUMA_BALANCING |
| /* |
| * See the comment in include/asm-generic/pgtable.h |
| */ |
| static inline int pte_protnone(pte_t pte) |
| { |
| return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE; |
| } |
| |
| static inline int pmd_protnone(pmd_t pmd) |
| { |
| return pte_protnone(pmd_pte(pmd)); |
| } |
| #endif |
| |
| /* |
| * THP definitions. |
| */ |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) |
| #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| |
| #define pmd_present(pmd) pte_present(pmd_pte(pmd)) |
| #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) |
| #define pmd_young(pmd) pte_young(pmd_pte(pmd)) |
| #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) |
| #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) |
| #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) |
| #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) |
| #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) |
| #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) |
| #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID)) |
| |
| #define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd)) |
| |
| #define __HAVE_ARCH_PMD_WRITE |
| #define pmd_write(pmd) pte_write(pmd_pte(pmd)) |
| |
| #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) |
| |
| #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) |
| #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) |
| #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) |
| |
| #define pud_write(pud) pte_write(pud_pte(pud)) |
| #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) |
| |
| #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) |
| |
| static inline int has_transparent_hugepage(void) |
| { |
| return 1; |
| } |
| |
| #define __pgprot_modify(prot,mask,bits) \ |
| __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) |
| |
| /* |
| * Mark the prot value as uncacheable and unbufferable. |
| */ |
| #define pgprot_noncached(prot) \ |
| __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) |
| #define pgprot_writecombine(prot) \ |
| __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) |
| #define pgprot_device(prot) \ |
| __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN) |
| #define __HAVE_PHYS_MEM_ACCESS_PROT |
| struct file; |
| extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| unsigned long size, pgprot_t vma_prot); |
| |
| #define pmd_none(pmd) (!pmd_val(pmd)) |
| |
| #define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT)) |
| |
| #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ |
| PMD_TYPE_TABLE) |
| #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ |
| PMD_TYPE_SECT) |
| |
| #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 |
| #define pud_sect(pud) (0) |
| #define pud_table(pud) (1) |
| #else |
| #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ |
| PUD_TYPE_SECT) |
| #define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ |
| PUD_TYPE_TABLE) |
| #endif |
| |
| static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) |
| { |
| *pmdp = pmd; |
| dsb(ishst); |
| isb(); |
| } |
| |
| static inline void pmd_clear(pmd_t *pmdp) |
| { |
| set_pmd(pmdp, __pmd(0)); |
| } |
| |
| static inline phys_addr_t pmd_page_paddr(pmd_t pmd) |
| { |
| return pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK; |
| } |
| |
| /* Find an entry in the third-level page table. */ |
| #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
| |
| #define pte_offset_phys(dir,addr) (pmd_page_paddr(*(dir)) + pte_index(addr) * sizeof(pte_t)) |
| #define pte_offset_kernel(dir,addr) ((pte_t *)__va(pte_offset_phys((dir), (addr)))) |
| |
| #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) |
| #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) |
| #define pte_unmap(pte) do { } while (0) |
| #define pte_unmap_nested(pte) do { } while (0) |
| |
| #define pte_set_fixmap(addr) ((pte_t *)set_fixmap_offset(FIX_PTE, addr)) |
| #define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr)) |
| #define pte_clear_fixmap() clear_fixmap(FIX_PTE) |
| |
| #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) |
| |
| /* use ONLY for statically allocated translation tables */ |
| #define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr)))) |
| |
| /* |
| * Conversion functions: convert a page and protection to a page entry, |
| * and a page entry and page directory to the page they refer to. |
| */ |
| #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) |
| |
| #if CONFIG_PGTABLE_LEVELS > 2 |
| |
| #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) |
| |
| #define pud_none(pud) (!pud_val(pud)) |
| #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) |
| #define pud_present(pud) (pud_val(pud)) |
| |
| static inline void set_pud(pud_t *pudp, pud_t pud) |
| { |
| *pudp = pud; |
| dsb(ishst); |
| isb(); |
| } |
| |
| static inline void pud_clear(pud_t *pudp) |
| { |
| set_pud(pudp, __pud(0)); |
| } |
| |
| static inline phys_addr_t pud_page_paddr(pud_t pud) |
| { |
| return pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK; |
| } |
| |
| /* Find an entry in the second-level page table. */ |
| #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) |
| |
| #define pmd_offset_phys(dir, addr) (pud_page_paddr(*(dir)) + pmd_index(addr) * sizeof(pmd_t)) |
| #define pmd_offset(dir, addr) ((pmd_t *)__va(pmd_offset_phys((dir), (addr)))) |
| |
| #define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr)) |
| #define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr)) |
| #define pmd_clear_fixmap() clear_fixmap(FIX_PMD) |
| |
| #define pud_page(pud) pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK)) |
| |
| /* use ONLY for statically allocated translation tables */ |
| #define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr)))) |
| |
| #else |
| |
| #define pud_page_paddr(pud) ({ BUILD_BUG(); 0; }) |
| |
| /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */ |
| #define pmd_set_fixmap(addr) NULL |
| #define pmd_set_fixmap_offset(pudp, addr) ((pmd_t *)pudp) |
| #define pmd_clear_fixmap() |
| |
| #define pmd_offset_kimg(dir,addr) ((pmd_t *)dir) |
| |
| #endif /* CONFIG_PGTABLE_LEVELS > 2 */ |
| |
| #if CONFIG_PGTABLE_LEVELS > 3 |
| |
| #define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud)) |
| |
| #define pgd_none(pgd) (!pgd_val(pgd)) |
| #define pgd_bad(pgd) (!(pgd_val(pgd) & 2)) |
| #define pgd_present(pgd) (pgd_val(pgd)) |
| |
| static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) |
| { |
| *pgdp = pgd; |
| dsb(ishst); |
| } |
| |
| static inline void pgd_clear(pgd_t *pgdp) |
| { |
| set_pgd(pgdp, __pgd(0)); |
| } |
| |
| static inline phys_addr_t pgd_page_paddr(pgd_t pgd) |
| { |
| return pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK; |
| } |
| |
| /* Find an entry in the frst-level page table. */ |
| #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) |
| |
| #define pud_offset_phys(dir, addr) (pgd_page_paddr(*(dir)) + pud_index(addr) * sizeof(pud_t)) |
| #define pud_offset(dir, addr) ((pud_t *)__va(pud_offset_phys((dir), (addr)))) |
| |
| #define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr)) |
| #define pud_set_fixmap_offset(pgd, addr) pud_set_fixmap(pud_offset_phys(pgd, addr)) |
| #define pud_clear_fixmap() clear_fixmap(FIX_PUD) |
| |
| #define pgd_page(pgd) pfn_to_page(__phys_to_pfn(pgd_val(pgd) & PHYS_MASK)) |
| |
| /* use ONLY for statically allocated translation tables */ |
| #define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr)))) |
| |
| #else |
| |
| #define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;}) |
| |
| /* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */ |
| #define pud_set_fixmap(addr) NULL |
| #define pud_set_fixmap_offset(pgdp, addr) ((pud_t *)pgdp) |
| #define pud_clear_fixmap() |
| |
| #define pud_offset_kimg(dir,addr) ((pud_t *)dir) |
| |
| #endif /* CONFIG_PGTABLE_LEVELS > 3 */ |
| |
| #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) |
| |
| /* to find an entry in a page-table-directory */ |
| #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) |
| |
| #define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr)) |
| |
| #define pgd_offset(mm, addr) (pgd_offset_raw((mm)->pgd, (addr))) |
| |
| /* to find an entry in a kernel page-table-directory */ |
| #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) |
| |
| #define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr)) |
| #define pgd_clear_fixmap() clear_fixmap(FIX_PGD) |
| |
| static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
| { |
| const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | |
| PTE_PROT_NONE | PTE_VALID | PTE_WRITE; |
| /* preserve the hardware dirty information */ |
| if (pte_hw_dirty(pte)) |
| pte = pte_mkdirty(pte); |
| pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
| return pte; |
| } |
| |
| static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) |
| { |
| return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); |
| } |
| |
| #ifdef CONFIG_ARM64_HW_AFDBM |
| #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
| extern int ptep_set_access_flags(struct vm_area_struct *vma, |
| unsigned long address, pte_t *ptep, |
| pte_t entry, int dirty); |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS |
| static inline int pmdp_set_access_flags(struct vm_area_struct *vma, |
| unsigned long address, pmd_t *pmdp, |
| pmd_t entry, int dirty) |
| { |
| return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty); |
| } |
| #endif |
| |
| /* |
| * Atomic pte/pmd modifications. |
| */ |
| #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
| static inline int __ptep_test_and_clear_young(pte_t *ptep) |
| { |
| pteval_t pteval; |
| unsigned int tmp, res; |
| |
| asm volatile("// __ptep_test_and_clear_young\n" |
| " prfm pstl1strm, %2\n" |
| "1: ldxr %0, %2\n" |
| " ubfx %w3, %w0, %5, #1 // extract PTE_AF (young)\n" |
| " and %0, %0, %4 // clear PTE_AF\n" |
| " stxr %w1, %0, %2\n" |
| " cbnz %w1, 1b\n" |
| : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)), "=&r" (res) |
| : "L" (~PTE_AF), "I" (ilog2(PTE_AF))); |
| |
| return res; |
| } |
| |
| static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
| unsigned long address, |
| pte_t *ptep) |
| { |
| return __ptep_test_and_clear_young(ptep); |
| } |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG |
| static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, |
| unsigned long address, |
| pmd_t *pmdp) |
| { |
| return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); |
| } |
| #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| |
| #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
| unsigned long address, pte_t *ptep) |
| { |
| pteval_t old_pteval; |
| unsigned int tmp; |
| |
| asm volatile("// ptep_get_and_clear\n" |
| " prfm pstl1strm, %2\n" |
| "1: ldxr %0, %2\n" |
| " stxr %w1, xzr, %2\n" |
| " cbnz %w1, 1b\n" |
| : "=&r" (old_pteval), "=&r" (tmp), "+Q" (pte_val(*ptep))); |
| |
| return __pte(old_pteval); |
| } |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR |
| static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, |
| unsigned long address, pmd_t *pmdp) |
| { |
| return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp)); |
| } |
| #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
| |
| /* |
| * ptep_set_wrprotect - mark read-only while trasferring potential hardware |
| * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit. |
| */ |
| #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) |
| { |
| pteval_t pteval; |
| unsigned long tmp; |
| |
| asm volatile("// ptep_set_wrprotect\n" |
| " prfm pstl1strm, %2\n" |
| "1: ldxr %0, %2\n" |
| " tst %0, %4 // check for hw dirty (!PTE_RDONLY)\n" |
| " csel %1, %3, xzr, eq // set PTE_DIRTY|PTE_RDONLY if dirty\n" |
| " orr %0, %0, %1 // if !dirty, PTE_RDONLY is already set\n" |
| " and %0, %0, %5 // clear PTE_WRITE/PTE_DBM\n" |
| " stxr %w1, %0, %2\n" |
| " cbnz %w1, 1b\n" |
| : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)) |
| : "r" (PTE_DIRTY|PTE_RDONLY), "L" (PTE_RDONLY), "L" (~PTE_WRITE) |
| : "cc"); |
| } |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| #define __HAVE_ARCH_PMDP_SET_WRPROTECT |
| static inline void pmdp_set_wrprotect(struct mm_struct *mm, |
| unsigned long address, pmd_t *pmdp) |
| { |
| ptep_set_wrprotect(mm, address, (pte_t *)pmdp); |
| } |
| #endif |
| #endif /* CONFIG_ARM64_HW_AFDBM */ |
| |
| extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; |
| |
| /* |
| * Encode and decode a swap entry: |
| * bits 0-1: present (must be zero) |
| * bits 2-7: swap type |
| * bits 8-57: swap offset |
| * bit 58: PTE_PROT_NONE (must be zero) |
| */ |
| #define __SWP_TYPE_SHIFT 2 |
| #define __SWP_TYPE_BITS 6 |
| #define __SWP_OFFSET_BITS 50 |
| #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) |
| #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) |
| #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) |
| |
| #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) |
| #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) |
| #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) |
| |
| #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) |
| |
| /* |
| * Ensure that there are not more swap files than can be encoded in the kernel |
| * PTEs. |
| */ |
| #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) |
| |
| extern int kern_addr_valid(unsigned long addr); |
| |
| #include <asm-generic/pgtable.h> |
| |
| void pgd_cache_init(void); |
| #define pgtable_cache_init pgd_cache_init |
| |
| /* |
| * On AArch64, the cache coherency is handled via the set_pte_at() function. |
| */ |
| static inline void update_mmu_cache(struct vm_area_struct *vma, |
| unsigned long addr, pte_t *ptep) |
| { |
| /* |
| * We don't do anything here, so there's a very small chance of |
| * us retaking a user fault which we just fixed up. The alternative |
| * is doing a dsb(ishst), but that penalises the fastpath. |
| */ |
| } |
| |
| #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) |
| |
| #define kc_vaddr_to_offset(v) ((v) & ~VA_START) |
| #define kc_offset_to_vaddr(o) ((o) | VA_START) |
| |
| #endif /* !__ASSEMBLY__ */ |
| |
| #endif /* __ASM_PGTABLE_H */ |