2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_PGTABLE_H
17 #define __ASM_PGTABLE_H
20 #include <asm/proc-fns.h>
22 #include <asm/memory.h>
23 #include <asm/pgtable-hwdef.h>
24 #include <asm/pgtable-prot.h>
29 * VMALLOC_START: beginning of the kernel vmalloc space
30 * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space
33 #define VMALLOC_START (MODULES_END)
34 #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
36 #define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
38 #define FIRST_USER_ADDRESS 0UL
42 #include <asm/fixmap.h>
43 #include <linux/mmdebug.h>
45 extern void __pte_error(const char *file, int line, unsigned long val);
46 extern void __pmd_error(const char *file, int line, unsigned long val);
47 extern void __pud_error(const char *file, int line, unsigned long val);
48 extern void __pgd_error(const char *file, int line, unsigned long val);
51 * ZERO_PAGE is a global shared page that is always zero: used
52 * for zero-mapped memory areas etc..
54 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
55 #define ZERO_PAGE(vaddr) phys_to_page(__pa_symbol(empty_zero_page))
57 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
59 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
61 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
63 #define pte_none(pte) (!pte_val(pte))
64 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
65 #define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
68 * The following only work if pte_present(). Undefined behaviour otherwise.
70 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
71 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF))
72 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL))
73 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE))
74 #define pte_user_exec(pte) (!(pte_val(pte) & PTE_UXN))
75 #define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT))
77 #ifdef CONFIG_ARM64_HW_AFDBM
78 #define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY))
80 #define pte_hw_dirty(pte) (0)
82 #define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY))
83 #define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte))
85 #define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID))
87 * Execute-only user mappings do not have the PTE_USER bit set. All valid
88 * kernel mappings have the PTE_UXN bit set.
90 #define pte_valid_not_user(pte) \
91 ((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_UXN)) == (PTE_VALID | PTE_UXN))
92 #define pte_valid_young(pte) \
93 ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF))
96 * Could the pte be present in the TLB? We must check mm_tlb_flush_pending
97 * so that we don't erroneously return false for pages that have been
98 * remapped as PROT_NONE but are yet to be flushed from the TLB.
100 #define pte_accessible(mm, pte) \
101 (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte))
103 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
105 pte_val(pte) &= ~pgprot_val(prot);
109 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
111 pte_val(pte) |= pgprot_val(prot);
115 static inline pte_t pte_wrprotect(pte_t pte)
117 return clear_pte_bit(pte, __pgprot(PTE_WRITE));
120 static inline pte_t pte_mkwrite(pte_t pte)
122 return set_pte_bit(pte, __pgprot(PTE_WRITE));
125 static inline pte_t pte_mkclean(pte_t pte)
127 return clear_pte_bit(pte, __pgprot(PTE_DIRTY));
130 static inline pte_t pte_mkdirty(pte_t pte)
132 return set_pte_bit(pte, __pgprot(PTE_DIRTY));
135 static inline pte_t pte_mkold(pte_t pte)
137 return clear_pte_bit(pte, __pgprot(PTE_AF));
140 static inline pte_t pte_mkyoung(pte_t pte)
142 return set_pte_bit(pte, __pgprot(PTE_AF));
145 static inline pte_t pte_mkspecial(pte_t pte)
147 return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
150 static inline pte_t pte_mkcont(pte_t pte)
152 pte = set_pte_bit(pte, __pgprot(PTE_CONT));
153 return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE));
156 static inline pte_t pte_mknoncont(pte_t pte)
158 return clear_pte_bit(pte, __pgprot(PTE_CONT));
161 static inline pte_t pte_clear_rdonly(pte_t pte)
163 return clear_pte_bit(pte, __pgprot(PTE_RDONLY));
166 static inline pte_t pte_mkpresent(pte_t pte)
168 return set_pte_bit(pte, __pgprot(PTE_VALID));
171 static inline pmd_t pmd_mkcont(pmd_t pmd)
173 return __pmd(pmd_val(pmd) | PMD_SECT_CONT);
176 static inline void set_pte(pte_t *ptep, pte_t pte)
181 * Only if the new pte is valid and kernel, otherwise TLB maintenance
182 * or update_mmu_cache() have the necessary barriers.
184 if (pte_valid_not_user(pte)) {
191 struct vm_area_struct;
193 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
196 * PTE bits configuration in the presence of hardware Dirty Bit Management
197 * (PTE_WRITE == PTE_DBM):
199 * Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw)
205 * When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via
206 * the page fault mechanism. Checking the dirty status of a pte becomes:
208 * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY)
210 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
211 pte_t *ptep, pte_t pte)
213 if (pte_present(pte)) {
214 if (pte_sw_dirty(pte) && pte_write(pte))
215 pte_val(pte) &= ~PTE_RDONLY;
217 pte_val(pte) |= PTE_RDONLY;
218 if (pte_user_exec(pte) && !pte_special(pte))
219 __sync_icache_dcache(pte, addr);
223 * If the existing pte is valid, check for potential race with
224 * hardware updates of the pte (ptep_set_access_flags safely changes
225 * valid ptes without going through an invalid entry).
227 if (IS_ENABLED(CONFIG_ARM64_HW_AFDBM) &&
228 pte_valid(*ptep) && pte_valid(pte)) {
229 VM_WARN_ONCE(!pte_young(pte),
230 "%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
231 __func__, pte_val(*ptep), pte_val(pte));
232 VM_WARN_ONCE(pte_write(*ptep) && !pte_dirty(pte),
233 "%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
234 __func__, pte_val(*ptep), pte_val(pte));
240 #define __HAVE_ARCH_PTE_SAME
241 static inline int pte_same(pte_t pte_a, pte_t pte_b)
245 lhs = pte_val(pte_a);
246 rhs = pte_val(pte_b);
248 if (pte_present(pte_a))
251 if (pte_present(pte_b))
258 * Huge pte definitions.
260 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT))
261 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
264 * Hugetlb definitions.
266 #define HUGE_MAX_HSTATE 4
267 #define HPAGE_SHIFT PMD_SHIFT
268 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
269 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
270 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
272 #define __HAVE_ARCH_PTE_SPECIAL
274 static inline pte_t pud_pte(pud_t pud)
276 return __pte(pud_val(pud));
279 static inline pmd_t pud_pmd(pud_t pud)
281 return __pmd(pud_val(pud));
284 static inline pte_t pmd_pte(pmd_t pmd)
286 return __pte(pmd_val(pmd));
289 static inline pmd_t pte_pmd(pte_t pte)
291 return __pmd(pte_val(pte));
294 static inline pgprot_t mk_sect_prot(pgprot_t prot)
296 return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT);
299 #ifdef CONFIG_NUMA_BALANCING
301 * See the comment in include/asm-generic/pgtable.h
303 static inline int pte_protnone(pte_t pte)
305 return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE;
308 static inline int pmd_protnone(pmd_t pmd)
310 return pte_protnone(pmd_pte(pmd));
318 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
319 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
320 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
322 #define pmd_present(pmd) pte_present(pmd_pte(pmd))
323 #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
324 #define pmd_young(pmd) pte_young(pmd_pte(pmd))
325 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
326 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
327 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
328 #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd)))
329 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
330 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
331 #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID))
333 #define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd))
335 #define __HAVE_ARCH_PMD_WRITE
336 #define pmd_write(pmd) pte_write(pmd_pte(pmd))
338 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
340 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
341 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
342 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
344 #define pud_write(pud) pte_write(pud_pte(pud))
345 #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
347 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd))
349 #define __pgprot_modify(prot,mask,bits) \
350 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
353 * Mark the prot value as uncacheable and unbufferable.
355 #define pgprot_noncached(prot) \
356 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
357 #define pgprot_writecombine(prot) \
358 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
359 #define pgprot_device(prot) \
360 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
361 #define __HAVE_PHYS_MEM_ACCESS_PROT
363 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
364 unsigned long size, pgprot_t vma_prot);
366 #define pmd_none(pmd) (!pmd_val(pmd))
368 #define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT))
370 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
372 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
375 #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
376 #define pud_sect(pud) (0)
377 #define pud_table(pud) (1)
379 #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \
381 #define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \
385 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
392 static inline void pmd_clear(pmd_t *pmdp)
394 set_pmd(pmdp, __pmd(0));
397 static inline phys_addr_t pmd_page_paddr(pmd_t pmd)
399 return pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK;
402 /* Find an entry in the third-level page table. */
403 #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
405 #define pte_offset_phys(dir,addr) (pmd_page_paddr(*(dir)) + pte_index(addr) * sizeof(pte_t))
406 #define pte_offset_kernel(dir,addr) ((pte_t *)__va(pte_offset_phys((dir), (addr))))
408 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
409 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
410 #define pte_unmap(pte) do { } while (0)
411 #define pte_unmap_nested(pte) do { } while (0)
413 #define pte_set_fixmap(addr) ((pte_t *)set_fixmap_offset(FIX_PTE, addr))
414 #define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr))
415 #define pte_clear_fixmap() clear_fixmap(FIX_PTE)
417 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
419 /* use ONLY for statically allocated translation tables */
420 #define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr))))
423 * Conversion functions: convert a page and protection to a page entry,
424 * and a page entry and page directory to the page they refer to.
426 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
428 #if CONFIG_PGTABLE_LEVELS > 2
430 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
432 #define pud_none(pud) (!pud_val(pud))
433 #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT))
434 #define pud_present(pud) (pud_val(pud))
436 static inline void set_pud(pud_t *pudp, pud_t pud)
443 static inline void pud_clear(pud_t *pudp)
445 set_pud(pudp, __pud(0));
448 static inline phys_addr_t pud_page_paddr(pud_t pud)
450 return pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK;
453 /* Find an entry in the second-level page table. */
454 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
456 #define pmd_offset_phys(dir, addr) (pud_page_paddr(*(dir)) + pmd_index(addr) * sizeof(pmd_t))
457 #define pmd_offset(dir, addr) ((pmd_t *)__va(pmd_offset_phys((dir), (addr))))
459 #define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr))
460 #define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr))
461 #define pmd_clear_fixmap() clear_fixmap(FIX_PMD)
463 #define pud_page(pud) pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK))
465 /* use ONLY for statically allocated translation tables */
466 #define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr))))
470 #define pud_page_paddr(pud) ({ BUILD_BUG(); 0; })
472 /* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */
473 #define pmd_set_fixmap(addr) NULL
474 #define pmd_set_fixmap_offset(pudp, addr) ((pmd_t *)pudp)
475 #define pmd_clear_fixmap()
477 #define pmd_offset_kimg(dir,addr) ((pmd_t *)dir)
479 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
481 #if CONFIG_PGTABLE_LEVELS > 3
483 #define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud))
485 #define pgd_none(pgd) (!pgd_val(pgd))
486 #define pgd_bad(pgd) (!(pgd_val(pgd) & 2))
487 #define pgd_present(pgd) (pgd_val(pgd))
489 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
495 static inline void pgd_clear(pgd_t *pgdp)
497 set_pgd(pgdp, __pgd(0));
500 static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
502 return pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK;
505 /* Find an entry in the frst-level page table. */
506 #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
508 #define pud_offset_phys(dir, addr) (pgd_page_paddr(*(dir)) + pud_index(addr) * sizeof(pud_t))
509 #define pud_offset(dir, addr) ((pud_t *)__va(pud_offset_phys((dir), (addr))))
511 #define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr))
512 #define pud_set_fixmap_offset(pgd, addr) pud_set_fixmap(pud_offset_phys(pgd, addr))
513 #define pud_clear_fixmap() clear_fixmap(FIX_PUD)
515 #define pgd_page(pgd) pfn_to_page(__phys_to_pfn(pgd_val(pgd) & PHYS_MASK))
517 /* use ONLY for statically allocated translation tables */
518 #define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr))))
522 #define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;})
524 /* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */
525 #define pud_set_fixmap(addr) NULL
526 #define pud_set_fixmap_offset(pgdp, addr) ((pud_t *)pgdp)
527 #define pud_clear_fixmap()
529 #define pud_offset_kimg(dir,addr) ((pud_t *)dir)
531 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
533 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
535 /* to find an entry in a page-table-directory */
536 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
538 #define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr))
540 #define pgd_offset(mm, addr) (pgd_offset_raw((mm)->pgd, (addr)))
542 /* to find an entry in a kernel page-table-directory */
543 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
545 #define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr))
546 #define pgd_clear_fixmap() clear_fixmap(FIX_PGD)
548 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
550 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
551 PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
552 /* preserve the hardware dirty information */
553 if (pte_hw_dirty(pte))
554 pte = pte_mkdirty(pte);
555 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
559 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
561 return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
564 #ifdef CONFIG_ARM64_HW_AFDBM
565 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
566 extern int ptep_set_access_flags(struct vm_area_struct *vma,
567 unsigned long address, pte_t *ptep,
568 pte_t entry, int dirty);
570 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
571 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
572 static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
573 unsigned long address, pmd_t *pmdp,
574 pmd_t entry, int dirty)
576 return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);
581 * Atomic pte/pmd modifications.
583 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
584 static inline int __ptep_test_and_clear_young(pte_t *ptep)
587 unsigned int tmp, res;
589 asm volatile("// __ptep_test_and_clear_young\n"
590 " prfm pstl1strm, %2\n"
592 " ubfx %w3, %w0, %5, #1 // extract PTE_AF (young)\n"
593 " and %0, %0, %4 // clear PTE_AF\n"
594 " stxr %w1, %0, %2\n"
596 : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)), "=&r" (res)
597 : "L" (~PTE_AF), "I" (ilog2(PTE_AF)));
602 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
603 unsigned long address,
606 return __ptep_test_and_clear_young(ptep);
609 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
610 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
611 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
612 unsigned long address,
615 return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
617 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
619 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
620 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
621 unsigned long address, pte_t *ptep)
626 asm volatile("// ptep_get_and_clear\n"
627 " prfm pstl1strm, %2\n"
629 " stxr %w1, xzr, %2\n"
631 : "=&r" (old_pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)));
633 return __pte(old_pteval);
636 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
637 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
638 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
639 unsigned long address, pmd_t *pmdp)
641 return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp));
643 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
646 * ptep_set_wrprotect - mark read-only while trasferring potential hardware
647 * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit.
649 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
650 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
655 asm volatile("// ptep_set_wrprotect\n"
656 " prfm pstl1strm, %2\n"
658 " tst %0, %4 // check for hw dirty (!PTE_RDONLY)\n"
659 " csel %1, %3, xzr, eq // set PTE_DIRTY|PTE_RDONLY if dirty\n"
660 " orr %0, %0, %1 // if !dirty, PTE_RDONLY is already set\n"
661 " and %0, %0, %5 // clear PTE_WRITE/PTE_DBM\n"
662 " stxr %w1, %0, %2\n"
664 : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep))
665 : "r" (PTE_DIRTY|PTE_RDONLY), "L" (PTE_RDONLY), "L" (~PTE_WRITE)
669 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
670 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
671 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
672 unsigned long address, pmd_t *pmdp)
674 ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
677 #endif /* CONFIG_ARM64_HW_AFDBM */
679 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
680 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
683 * Encode and decode a swap entry:
684 * bits 0-1: present (must be zero)
685 * bits 2-7: swap type
686 * bits 8-57: swap offset
687 * bit 58: PTE_PROT_NONE (must be zero)
689 #define __SWP_TYPE_SHIFT 2
690 #define __SWP_TYPE_BITS 6
691 #define __SWP_OFFSET_BITS 50
692 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
693 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
694 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1)
696 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
697 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
698 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
700 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
701 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
704 * Ensure that there are not more swap files than can be encoded in the kernel
707 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
709 extern int kern_addr_valid(unsigned long addr);
711 #include <asm-generic/pgtable.h>
713 void pgd_cache_init(void);
714 #define pgtable_cache_init pgd_cache_init
717 * On AArch64, the cache coherency is handled via the set_pte_at() function.
719 static inline void update_mmu_cache(struct vm_area_struct *vma,
720 unsigned long addr, pte_t *ptep)
723 * We don't do anything here, so there's a very small chance of
724 * us retaking a user fault which we just fixed up. The alternative
725 * is doing a dsb(ishst), but that penalises the fastpath.
729 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
731 #define kc_vaddr_to_offset(v) ((v) & ~VA_START)
732 #define kc_offset_to_vaddr(o) ((o) | VA_START)
734 #endif /* !__ASSEMBLY__ */
736 #endif /* __ASM_PGTABLE_H */