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Linux/arch/arm64/include/asm/pgtable.h

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  1 /*
  2  * Copyright (C) 2012 ARM Ltd.
  3  *
  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.
  7  *
  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.
 12  *
 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/>.
 15  */
 16 #ifndef __ASM_PGTABLE_H
 17 #define __ASM_PGTABLE_H
 18 
 19 #include <asm/proc-fns.h>
 20 
 21 #include <asm/memory.h>
 22 #include <asm/pgtable-hwdef.h>
 23 
 24 /*
 25  * Software defined PTE bits definition.
 26  */
 27 #define PTE_VALID               (_AT(pteval_t, 1) << 0)
 28 #define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
 29 #define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
 30 #define PTE_WRITE               (_AT(pteval_t, 1) << 57)
 31 #define PTE_PROT_NONE           (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
 32 
 33 /*
 34  * VMALLOC and SPARSEMEM_VMEMMAP ranges.
 35  *
 36  * VMEMAP_SIZE: allows the whole linear region to be covered by a struct page array
 37  *      (rounded up to PUD_SIZE).
 38  * VMALLOC_START: beginning of the kernel VA space
 39  * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space,
 40  *      fixed mappings and modules
 41  */
 42 #define VMEMMAP_SIZE            ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)
 43 #define VMALLOC_START           (UL(0xffffffffffffffff) << VA_BITS)
 44 #define VMALLOC_END             (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
 45 
 46 #define VMEMMAP_START           (VMALLOC_END + SZ_64K)
 47 #define vmemmap                 ((struct page *)VMEMMAP_START - \
 48                                  SECTION_ALIGN_DOWN(memstart_addr >> PAGE_SHIFT))
 49 
 50 #define FIRST_USER_ADDRESS      0UL
 51 
 52 #ifndef __ASSEMBLY__
 53 extern void __pte_error(const char *file, int line, unsigned long val);
 54 extern void __pmd_error(const char *file, int line, unsigned long val);
 55 extern void __pud_error(const char *file, int line, unsigned long val);
 56 extern void __pgd_error(const char *file, int line, unsigned long val);
 57 
 58 #ifdef CONFIG_SMP
 59 #define PROT_DEFAULT            (PTE_TYPE_PAGE | PTE_AF | PTE_SHARED)
 60 #define PROT_SECT_DEFAULT       (PMD_TYPE_SECT | PMD_SECT_AF | PMD_SECT_S)
 61 #else
 62 #define PROT_DEFAULT            (PTE_TYPE_PAGE | PTE_AF)
 63 #define PROT_SECT_DEFAULT       (PMD_TYPE_SECT | PMD_SECT_AF)
 64 #endif
 65 
 66 #define PROT_DEVICE_nGnRE       (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE))
 67 #define PROT_NORMAL_NC          (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL_NC))
 68 #define PROT_NORMAL             (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL))
 69 
 70 #define PROT_SECT_DEVICE_nGnRE  (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE))
 71 #define PROT_SECT_NORMAL        (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
 72 #define PROT_SECT_NORMAL_EXEC   (PROT_SECT_DEFAULT | PMD_SECT_UXN | PMD_ATTRINDX(MT_NORMAL))
 73 
 74 #define _PAGE_DEFAULT           (PROT_DEFAULT | PTE_ATTRINDX(MT_NORMAL))
 75 
 76 #define PAGE_KERNEL             __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE)
 77 #define PAGE_KERNEL_EXEC        __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE)
 78 
 79 #define PAGE_HYP                __pgprot(_PAGE_DEFAULT | PTE_HYP)
 80 #define PAGE_HYP_DEVICE         __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
 81 
 82 #define PAGE_S2                 __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY)
 83 #define PAGE_S2_DEVICE          __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDONLY | PTE_UXN)
 84 
 85 #define PAGE_NONE               __pgprot(((_PAGE_DEFAULT) & ~PTE_VALID) | PTE_PROT_NONE | PTE_PXN | PTE_UXN)
 86 #define PAGE_SHARED             __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
 87 #define PAGE_SHARED_EXEC        __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
 88 #define PAGE_COPY               __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
 89 #define PAGE_COPY_EXEC          __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
 90 #define PAGE_READONLY           __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
 91 #define PAGE_READONLY_EXEC      __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
 92 
 93 #define __P000  PAGE_NONE
 94 #define __P001  PAGE_READONLY
 95 #define __P010  PAGE_COPY
 96 #define __P011  PAGE_COPY
 97 #define __P100  PAGE_READONLY_EXEC
 98 #define __P101  PAGE_READONLY_EXEC
 99 #define __P110  PAGE_COPY_EXEC
100 #define __P111  PAGE_COPY_EXEC
101 
102 #define __S000  PAGE_NONE
103 #define __S001  PAGE_READONLY
104 #define __S010  PAGE_SHARED
105 #define __S011  PAGE_SHARED
106 #define __S100  PAGE_READONLY_EXEC
107 #define __S101  PAGE_READONLY_EXEC
108 #define __S110  PAGE_SHARED_EXEC
109 #define __S111  PAGE_SHARED_EXEC
110 
111 /*
112  * ZERO_PAGE is a global shared page that is always zero: used
113  * for zero-mapped memory areas etc..
114  */
115 extern struct page *empty_zero_page;
116 #define ZERO_PAGE(vaddr)        (empty_zero_page)
117 
118 #define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
119 
120 #define pte_pfn(pte)            ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
121 
122 #define pfn_pte(pfn,prot)       (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
123 
124 #define pte_none(pte)           (!pte_val(pte))
125 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
126 #define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
127 
128 /* Find an entry in the third-level page table. */
129 #define pte_index(addr)         (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
130 
131 #define pte_offset_kernel(dir,addr)     (pmd_page_vaddr(*(dir)) + pte_index(addr))
132 
133 #define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
134 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
135 #define pte_unmap(pte)                  do { } while (0)
136 #define pte_unmap_nested(pte)           do { } while (0)
137 
138 /*
139  * The following only work if pte_present(). Undefined behaviour otherwise.
140  */
141 #define pte_present(pte)        (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
142 #define pte_dirty(pte)          (!!(pte_val(pte) & PTE_DIRTY))
143 #define pte_young(pte)          (!!(pte_val(pte) & PTE_AF))
144 #define pte_special(pte)        (!!(pte_val(pte) & PTE_SPECIAL))
145 #define pte_write(pte)          (!!(pte_val(pte) & PTE_WRITE))
146 #define pte_exec(pte)           (!(pte_val(pte) & PTE_UXN))
147 
148 #define pte_valid_user(pte) \
149         ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
150 #define pte_valid_not_user(pte) \
151         ((pte_val(pte) & (PTE_VALID | PTE_USER)) == PTE_VALID)
152 
153 static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
154 {
155         pte_val(pte) &= ~pgprot_val(prot);
156         return pte;
157 }
158 
159 static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
160 {
161         pte_val(pte) |= pgprot_val(prot);
162         return pte;
163 }
164 
165 static inline pte_t pte_wrprotect(pte_t pte)
166 {
167         return clear_pte_bit(pte, __pgprot(PTE_WRITE));
168 }
169 
170 static inline pte_t pte_mkwrite(pte_t pte)
171 {
172         return set_pte_bit(pte, __pgprot(PTE_WRITE));
173 }
174 
175 static inline pte_t pte_mkclean(pte_t pte)
176 {
177         return clear_pte_bit(pte, __pgprot(PTE_DIRTY));
178 }
179 
180 static inline pte_t pte_mkdirty(pte_t pte)
181 {
182         return set_pte_bit(pte, __pgprot(PTE_DIRTY));
183 }
184 
185 static inline pte_t pte_mkold(pte_t pte)
186 {
187         return clear_pte_bit(pte, __pgprot(PTE_AF));
188 }
189 
190 static inline pte_t pte_mkyoung(pte_t pte)
191 {
192         return set_pte_bit(pte, __pgprot(PTE_AF));
193 }
194 
195 static inline pte_t pte_mkspecial(pte_t pte)
196 {
197         return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
198 }
199 
200 static inline void set_pte(pte_t *ptep, pte_t pte)
201 {
202         *ptep = pte;
203 
204         /*
205          * Only if the new pte is valid and kernel, otherwise TLB maintenance
206          * or update_mmu_cache() have the necessary barriers.
207          */
208         if (pte_valid_not_user(pte)) {
209                 dsb(ishst);
210                 isb();
211         }
212 }
213 
214 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
215 
216 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
217                               pte_t *ptep, pte_t pte)
218 {
219         if (pte_valid_user(pte)) {
220                 if (!pte_special(pte) && pte_exec(pte))
221                         __sync_icache_dcache(pte, addr);
222                 if (pte_dirty(pte) && pte_write(pte))
223                         pte_val(pte) &= ~PTE_RDONLY;
224                 else
225                         pte_val(pte) |= PTE_RDONLY;
226         }
227 
228         set_pte(ptep, pte);
229 }
230 
231 /*
232  * Huge pte definitions.
233  */
234 #define pte_huge(pte)           (!(pte_val(pte) & PTE_TABLE_BIT))
235 #define pte_mkhuge(pte)         (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
236 
237 /*
238  * Hugetlb definitions.
239  */
240 #define HUGE_MAX_HSTATE         2
241 #define HPAGE_SHIFT             PMD_SHIFT
242 #define HPAGE_SIZE              (_AC(1, UL) << HPAGE_SHIFT)
243 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
244 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
245 
246 #define __HAVE_ARCH_PTE_SPECIAL
247 
248 static inline pte_t pud_pte(pud_t pud)
249 {
250         return __pte(pud_val(pud));
251 }
252 
253 static inline pmd_t pud_pmd(pud_t pud)
254 {
255         return __pmd(pud_val(pud));
256 }
257 
258 static inline pte_t pmd_pte(pmd_t pmd)
259 {
260         return __pte(pmd_val(pmd));
261 }
262 
263 static inline pmd_t pte_pmd(pte_t pte)
264 {
265         return __pmd(pte_val(pte));
266 }
267 
268 static inline pgprot_t mk_sect_prot(pgprot_t prot)
269 {
270         return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT);
271 }
272 
273 /*
274  * THP definitions.
275  */
276 
277 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
278 #define pmd_trans_huge(pmd)     (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
279 #define pmd_trans_splitting(pmd)        pte_special(pmd_pte(pmd))
280 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
281 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
282 struct vm_area_struct;
283 void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
284                           pmd_t *pmdp);
285 #endif /* CONFIG_HAVE_RCU_TABLE_FREE */
286 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
287 
288 #define pmd_present(pmd)        pte_present(pmd_pte(pmd))
289 #define pmd_dirty(pmd)          pte_dirty(pmd_pte(pmd))
290 #define pmd_young(pmd)          pte_young(pmd_pte(pmd))
291 #define pmd_wrprotect(pmd)      pte_pmd(pte_wrprotect(pmd_pte(pmd)))
292 #define pmd_mksplitting(pmd)    pte_pmd(pte_mkspecial(pmd_pte(pmd)))
293 #define pmd_mkold(pmd)          pte_pmd(pte_mkold(pmd_pte(pmd)))
294 #define pmd_mkwrite(pmd)        pte_pmd(pte_mkwrite(pmd_pte(pmd)))
295 #define pmd_mkdirty(pmd)        pte_pmd(pte_mkdirty(pmd_pte(pmd)))
296 #define pmd_mkyoung(pmd)        pte_pmd(pte_mkyoung(pmd_pte(pmd)))
297 #define pmd_mknotpresent(pmd)   (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID))
298 
299 #define __HAVE_ARCH_PMD_WRITE
300 #define pmd_write(pmd)          pte_write(pmd_pte(pmd))
301 
302 #define pmd_mkhuge(pmd)         (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
303 
304 #define pmd_pfn(pmd)            (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
305 #define pfn_pmd(pfn,prot)       (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
306 #define mk_pmd(page,prot)       pfn_pmd(page_to_pfn(page),prot)
307 
308 #define pud_write(pud)          pte_write(pud_pte(pud))
309 #define pud_pfn(pud)            (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
310 
311 #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd))
312 
313 static inline int has_transparent_hugepage(void)
314 {
315         return 1;
316 }
317 
318 #define __pgprot_modify(prot,mask,bits) \
319         __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
320 
321 /*
322  * Mark the prot value as uncacheable and unbufferable.
323  */
324 #define pgprot_noncached(prot) \
325         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
326 #define pgprot_writecombine(prot) \
327         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
328 #define pgprot_device(prot) \
329         __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
330 #define __HAVE_PHYS_MEM_ACCESS_PROT
331 struct file;
332 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
333                                      unsigned long size, pgprot_t vma_prot);
334 
335 #define pmd_none(pmd)           (!pmd_val(pmd))
336 
337 #define pmd_bad(pmd)            (!(pmd_val(pmd) & 2))
338 
339 #define pmd_table(pmd)          ((pmd_val(pmd) & PMD_TYPE_MASK) == \
340                                  PMD_TYPE_TABLE)
341 #define pmd_sect(pmd)           ((pmd_val(pmd) & PMD_TYPE_MASK) == \
342                                  PMD_TYPE_SECT)
343 
344 #ifdef CONFIG_ARM64_64K_PAGES
345 #define pud_sect(pud)           (0)
346 #define pud_table(pud)          (1)
347 #else
348 #define pud_sect(pud)           ((pud_val(pud) & PUD_TYPE_MASK) == \
349                                  PUD_TYPE_SECT)
350 #define pud_table(pud)          ((pud_val(pud) & PUD_TYPE_MASK) == \
351                                  PUD_TYPE_TABLE)
352 #endif
353 
354 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
355 {
356         *pmdp = pmd;
357         dsb(ishst);
358         isb();
359 }
360 
361 static inline void pmd_clear(pmd_t *pmdp)
362 {
363         set_pmd(pmdp, __pmd(0));
364 }
365 
366 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
367 {
368         return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
369 }
370 
371 #define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
372 
373 /*
374  * Conversion functions: convert a page and protection to a page entry,
375  * and a page entry and page directory to the page they refer to.
376  */
377 #define mk_pte(page,prot)       pfn_pte(page_to_pfn(page),prot)
378 
379 #if CONFIG_PGTABLE_LEVELS > 2
380 
381 #define pmd_ERROR(pmd)          __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
382 
383 #define pud_none(pud)           (!pud_val(pud))
384 #define pud_bad(pud)            (!(pud_val(pud) & 2))
385 #define pud_present(pud)        (pud_val(pud))
386 
387 static inline void set_pud(pud_t *pudp, pud_t pud)
388 {
389         *pudp = pud;
390         dsb(ishst);
391         isb();
392 }
393 
394 static inline void pud_clear(pud_t *pudp)
395 {
396         set_pud(pudp, __pud(0));
397 }
398 
399 static inline pmd_t *pud_page_vaddr(pud_t pud)
400 {
401         return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
402 }
403 
404 /* Find an entry in the second-level page table. */
405 #define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
406 
407 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
408 {
409         return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
410 }
411 
412 #define pud_page(pud)           pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK))
413 
414 #endif  /* CONFIG_PGTABLE_LEVELS > 2 */
415 
416 #if CONFIG_PGTABLE_LEVELS > 3
417 
418 #define pud_ERROR(pud)          __pud_error(__FILE__, __LINE__, pud_val(pud))
419 
420 #define pgd_none(pgd)           (!pgd_val(pgd))
421 #define pgd_bad(pgd)            (!(pgd_val(pgd) & 2))
422 #define pgd_present(pgd)        (pgd_val(pgd))
423 
424 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
425 {
426         *pgdp = pgd;
427         dsb(ishst);
428 }
429 
430 static inline void pgd_clear(pgd_t *pgdp)
431 {
432         set_pgd(pgdp, __pgd(0));
433 }
434 
435 static inline pud_t *pgd_page_vaddr(pgd_t pgd)
436 {
437         return __va(pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK);
438 }
439 
440 /* Find an entry in the frst-level page table. */
441 #define pud_index(addr)         (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
442 
443 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long addr)
444 {
445         return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(addr);
446 }
447 
448 #define pgd_page(pgd)           pfn_to_page(__phys_to_pfn(pgd_val(pgd) & PHYS_MASK))
449 
450 #endif  /* CONFIG_PGTABLE_LEVELS > 3 */
451 
452 #define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
453 
454 /* to find an entry in a page-table-directory */
455 #define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
456 
457 #define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
458 
459 /* to find an entry in a kernel page-table-directory */
460 #define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
461 
462 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
463 {
464         const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
465                               PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
466         pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
467         return pte;
468 }
469 
470 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
471 {
472         return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
473 }
474 
475 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
476 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
477 
478 /*
479  * Encode and decode a swap entry:
480  *      bits 0-1:       present (must be zero)
481  *      bits 2-7:       swap type
482  *      bits 8-57:      swap offset
483  */
484 #define __SWP_TYPE_SHIFT        2
485 #define __SWP_TYPE_BITS         6
486 #define __SWP_OFFSET_BITS       50
487 #define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
488 #define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
489 #define __SWP_OFFSET_MASK       ((1UL << __SWP_OFFSET_BITS) - 1)
490 
491 #define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
492 #define __swp_offset(x)         (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
493 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
494 
495 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
496 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
497 
498 /*
499  * Ensure that there are not more swap files than can be encoded in the kernel
500  * PTEs.
501  */
502 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
503 
504 extern int kern_addr_valid(unsigned long addr);
505 
506 #include <asm-generic/pgtable.h>
507 
508 #define pgtable_cache_init() do { } while (0)
509 
510 #endif /* !__ASSEMBLY__ */
511 
512 #endif /* __ASM_PGTABLE_H */
513 

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