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4f04d8f0 CM |
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 | */ | |
a6fadf7e | 27 | #define PTE_VALID (_AT(pteval_t, 1) << 0) |
3676f9ef | 28 | #define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */ |
4f04d8f0 CM |
29 | #define PTE_DIRTY (_AT(pteval_t, 1) << 55) |
30 | #define PTE_SPECIAL (_AT(pteval_t, 1) << 56) | |
c2c93e5b | 31 | #define PTE_WRITE (_AT(pteval_t, 1) << 57) |
3676f9ef | 32 | #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */ |
4f04d8f0 CM |
33 | |
34 | /* | |
35 | * VMALLOC and SPARSEMEM_VMEMMAP ranges. | |
36 | */ | |
847264fb | 37 | #define VMALLOC_START (UL(0xffffffffffffffff) << VA_BITS) |
4f04d8f0 CM |
38 | #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K) |
39 | ||
40 | #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K)) | |
41 | ||
42 | #define FIRST_USER_ADDRESS 0 | |
43 | ||
44 | #ifndef __ASSEMBLY__ | |
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 __pgd_error(const char *file, int line, unsigned long val); | |
48 | ||
49 | #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) | |
50 | #ifndef CONFIG_ARM64_64K_PAGES | |
51 | #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) | |
52 | #endif | |
53 | #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) | |
54 | ||
55 | /* | |
56 | * The pgprot_* and protection_map entries will be fixed up at runtime to | |
57 | * include the cachable and bufferable bits based on memory policy, as well as | |
58 | * any architecture dependent bits like global/ASID and SMP shared mapping | |
59 | * bits. | |
60 | */ | |
61 | #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF | |
62 | ||
63 | extern pgprot_t pgprot_default; | |
64 | ||
a6fadf7e WD |
65 | #define __pgprot_modify(prot,mask,bits) \ |
66 | __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) | |
67 | ||
68 | #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b) | |
4f04d8f0 | 69 | |
c2c93e5b SC |
70 | #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_PXN | PTE_UXN) |
71 | #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) | |
72 | #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) | |
73 | #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) | |
74 | #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) | |
75 | #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) | |
76 | #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN) | |
77 | #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE) | |
78 | #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY | PTE_WRITE) | |
8e620b04 | 79 | |
36311607 MZ |
80 | #define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP) |
81 | #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP) | |
82 | ||
83 | #define PAGE_S2 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY) | |
84 | #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN) | |
85 | ||
c2c93e5b SC |
86 | #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN) |
87 | #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE) | |
88 | #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE) | |
89 | #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) | |
90 | #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) | |
91 | #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN) | |
92 | #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN) | |
4f04d8f0 CM |
93 | |
94 | #endif /* __ASSEMBLY__ */ | |
95 | ||
96 | #define __P000 __PAGE_NONE | |
97 | #define __P001 __PAGE_READONLY | |
98 | #define __P010 __PAGE_COPY | |
99 | #define __P011 __PAGE_COPY | |
100 | #define __P100 __PAGE_READONLY_EXEC | |
101 | #define __P101 __PAGE_READONLY_EXEC | |
102 | #define __P110 __PAGE_COPY_EXEC | |
103 | #define __P111 __PAGE_COPY_EXEC | |
104 | ||
105 | #define __S000 __PAGE_NONE | |
106 | #define __S001 __PAGE_READONLY | |
107 | #define __S010 __PAGE_SHARED | |
108 | #define __S011 __PAGE_SHARED | |
109 | #define __S100 __PAGE_READONLY_EXEC | |
110 | #define __S101 __PAGE_READONLY_EXEC | |
111 | #define __S110 __PAGE_SHARED_EXEC | |
112 | #define __S111 __PAGE_SHARED_EXEC | |
113 | ||
114 | #ifndef __ASSEMBLY__ | |
115 | /* | |
116 | * ZERO_PAGE is a global shared page that is always zero: used | |
117 | * for zero-mapped memory areas etc.. | |
118 | */ | |
119 | extern struct page *empty_zero_page; | |
120 | #define ZERO_PAGE(vaddr) (empty_zero_page) | |
121 | ||
122 | #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) | |
123 | ||
124 | #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) | |
125 | ||
126 | #define pte_none(pte) (!pte_val(pte)) | |
127 | #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0)) | |
128 | #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) | |
9ab6d02f | 129 | #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + pte_index(addr)) |
4f04d8f0 CM |
130 | |
131 | #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) | |
132 | #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) | |
133 | #define pte_unmap(pte) do { } while (0) | |
134 | #define pte_unmap_nested(pte) do { } while (0) | |
135 | ||
136 | /* | |
137 | * The following only work if pte_present(). Undefined behaviour otherwise. | |
138 | */ | |
a6fadf7e | 139 | #define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) |
4f04d8f0 CM |
140 | #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY) |
141 | #define pte_young(pte) (pte_val(pte) & PTE_AF) | |
142 | #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL) | |
c2c93e5b | 143 | #define pte_write(pte) (pte_val(pte) & PTE_WRITE) |
8e620b04 | 144 | #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN)) |
4f04d8f0 | 145 | |
a6fadf7e | 146 | #define pte_valid_user(pte) \ |
02522463 | 147 | ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER)) |
4f04d8f0 | 148 | |
44b6dfc5 SC |
149 | static inline pte_t pte_wrprotect(pte_t pte) |
150 | { | |
c2c93e5b | 151 | pte_val(pte) &= ~PTE_WRITE; |
44b6dfc5 SC |
152 | return pte; |
153 | } | |
154 | ||
155 | static inline pte_t pte_mkwrite(pte_t pte) | |
156 | { | |
c2c93e5b | 157 | pte_val(pte) |= PTE_WRITE; |
44b6dfc5 SC |
158 | return pte; |
159 | } | |
160 | ||
161 | static inline pte_t pte_mkclean(pte_t pte) | |
162 | { | |
163 | pte_val(pte) &= ~PTE_DIRTY; | |
164 | return pte; | |
165 | } | |
166 | ||
167 | static inline pte_t pte_mkdirty(pte_t pte) | |
168 | { | |
169 | pte_val(pte) |= PTE_DIRTY; | |
170 | return pte; | |
171 | } | |
172 | ||
173 | static inline pte_t pte_mkold(pte_t pte) | |
174 | { | |
175 | pte_val(pte) &= ~PTE_AF; | |
176 | return pte; | |
177 | } | |
178 | ||
179 | static inline pte_t pte_mkyoung(pte_t pte) | |
180 | { | |
181 | pte_val(pte) |= PTE_AF; | |
182 | return pte; | |
183 | } | |
184 | ||
185 | static inline pte_t pte_mkspecial(pte_t pte) | |
186 | { | |
187 | pte_val(pte) |= PTE_SPECIAL; | |
188 | return pte; | |
189 | } | |
4f04d8f0 CM |
190 | |
191 | static inline void set_pte(pte_t *ptep, pte_t pte) | |
192 | { | |
193 | *ptep = pte; | |
194 | } | |
195 | ||
196 | extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); | |
197 | ||
198 | static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, | |
199 | pte_t *ptep, pte_t pte) | |
200 | { | |
a6fadf7e | 201 | if (pte_valid_user(pte)) { |
02522463 WD |
202 | if (pte_exec(pte)) |
203 | __sync_icache_dcache(pte, addr); | |
c2c93e5b SC |
204 | if (pte_dirty(pte) && pte_write(pte)) |
205 | pte_val(pte) &= ~PTE_RDONLY; | |
206 | else | |
207 | pte_val(pte) |= PTE_RDONLY; | |
02522463 WD |
208 | } |
209 | ||
4f04d8f0 CM |
210 | set_pte(ptep, pte); |
211 | } | |
212 | ||
213 | /* | |
214 | * Huge pte definitions. | |
215 | */ | |
084bd298 SC |
216 | #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) |
217 | #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) | |
218 | ||
219 | /* | |
220 | * Hugetlb definitions. | |
221 | */ | |
222 | #define HUGE_MAX_HSTATE 2 | |
223 | #define HPAGE_SHIFT PMD_SHIFT | |
224 | #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) | |
225 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
226 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
4f04d8f0 | 227 | |
4f04d8f0 CM |
228 | #define __HAVE_ARCH_PTE_SPECIAL |
229 | ||
af074848 SC |
230 | /* |
231 | * Software PMD bits for THP | |
232 | */ | |
233 | ||
234 | #define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) | |
235 | #define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 57) | |
236 | ||
237 | /* | |
238 | * THP definitions. | |
239 | */ | |
240 | #define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF) | |
241 | ||
242 | #define __HAVE_ARCH_PMD_WRITE | |
243 | #define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY)) | |
244 | ||
245 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
246 | #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) | |
247 | #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING) | |
248 | #endif | |
249 | ||
250 | #define PMD_BIT_FUNC(fn,op) \ | |
251 | static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; } | |
252 | ||
253 | PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY); | |
254 | PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF); | |
255 | PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING); | |
256 | PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY); | |
257 | PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY); | |
258 | PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF); | |
259 | PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK); | |
260 | ||
261 | #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) | |
262 | ||
263 | #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT) | |
264 | #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) | |
265 | #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot) | |
266 | ||
267 | #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) | |
268 | ||
269 | static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) | |
270 | { | |
271 | const pmdval_t mask = PMD_SECT_USER | PMD_SECT_PXN | PMD_SECT_UXN | | |
272 | PMD_SECT_RDONLY | PMD_SECT_PROT_NONE | | |
273 | PMD_SECT_VALID; | |
274 | pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask); | |
275 | return pmd; | |
276 | } | |
277 | ||
278 | #define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd) | |
279 | ||
280 | static inline int has_transparent_hugepage(void) | |
281 | { | |
282 | return 1; | |
283 | } | |
284 | ||
4f04d8f0 CM |
285 | /* |
286 | * Mark the prot value as uncacheable and unbufferable. | |
287 | */ | |
288 | #define pgprot_noncached(prot) \ | |
289 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE)) | |
290 | #define pgprot_writecombine(prot) \ | |
4f00130b | 291 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) |
4f04d8f0 CM |
292 | #define pgprot_dmacoherent(prot) \ |
293 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC)) | |
294 | #define __HAVE_PHYS_MEM_ACCESS_PROT | |
295 | struct file; | |
296 | extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, | |
297 | unsigned long size, pgprot_t vma_prot); | |
298 | ||
299 | #define pmd_none(pmd) (!pmd_val(pmd)) | |
300 | #define pmd_present(pmd) (pmd_val(pmd)) | |
301 | ||
302 | #define pmd_bad(pmd) (!(pmd_val(pmd) & 2)) | |
303 | ||
36311607 MZ |
304 | #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ |
305 | PMD_TYPE_TABLE) | |
306 | #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ | |
307 | PMD_TYPE_SECT) | |
308 | ||
309 | ||
4f04d8f0 CM |
310 | static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) |
311 | { | |
312 | *pmdp = pmd; | |
313 | dsb(); | |
314 | } | |
315 | ||
316 | static inline void pmd_clear(pmd_t *pmdp) | |
317 | { | |
318 | set_pmd(pmdp, __pmd(0)); | |
319 | } | |
320 | ||
321 | static inline pte_t *pmd_page_vaddr(pmd_t pmd) | |
322 | { | |
323 | return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK); | |
324 | } | |
325 | ||
326 | #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) | |
327 | ||
328 | /* | |
329 | * Conversion functions: convert a page and protection to a page entry, | |
330 | * and a page entry and page directory to the page they refer to. | |
331 | */ | |
332 | #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) | |
333 | ||
334 | #ifndef CONFIG_ARM64_64K_PAGES | |
335 | ||
336 | #define pud_none(pud) (!pud_val(pud)) | |
337 | #define pud_bad(pud) (!(pud_val(pud) & 2)) | |
338 | #define pud_present(pud) (pud_val(pud)) | |
339 | ||
340 | static inline void set_pud(pud_t *pudp, pud_t pud) | |
341 | { | |
342 | *pudp = pud; | |
343 | dsb(); | |
344 | } | |
345 | ||
346 | static inline void pud_clear(pud_t *pudp) | |
347 | { | |
348 | set_pud(pudp, __pud(0)); | |
349 | } | |
350 | ||
351 | static inline pmd_t *pud_page_vaddr(pud_t pud) | |
352 | { | |
353 | return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK); | |
354 | } | |
355 | ||
356 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
357 | ||
358 | /* to find an entry in a page-table-directory */ | |
359 | #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
360 | ||
361 | #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr)) | |
362 | ||
363 | /* to find an entry in a kernel page-table-directory */ | |
364 | #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) | |
365 | ||
366 | /* Find an entry in the second-level page table.. */ | |
367 | #ifndef CONFIG_ARM64_64K_PAGES | |
368 | #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) | |
369 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr) | |
370 | { | |
371 | return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr); | |
372 | } | |
373 | #endif | |
374 | ||
375 | /* Find an entry in the third-level page table.. */ | |
9ab6d02f | 376 | #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
4f04d8f0 CM |
377 | |
378 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
379 | { | |
a6fadf7e | 380 | const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | |
c2c93e5b | 381 | PTE_PROT_NONE | PTE_VALID | PTE_WRITE; |
4f04d8f0 CM |
382 | pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
383 | return pte; | |
384 | } | |
385 | ||
386 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; | |
387 | extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; | |
388 | ||
389 | #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE) | |
390 | #define IDMAP_DIR_SIZE (2 * PAGE_SIZE) | |
391 | ||
392 | /* | |
393 | * Encode and decode a swap entry: | |
3676f9ef CM |
394 | * bits 0-1: present (must be zero) |
395 | * bit 2: PTE_FILE | |
396 | * bits 3-8: swap type | |
397 | * bits 9-57: swap offset | |
4f04d8f0 | 398 | */ |
3676f9ef | 399 | #define __SWP_TYPE_SHIFT 3 |
4f04d8f0 | 400 | #define __SWP_TYPE_BITS 6 |
3676f9ef | 401 | #define __SWP_OFFSET_BITS 49 |
4f04d8f0 CM |
402 | #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) |
403 | #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) | |
3676f9ef | 404 | #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) |
4f04d8f0 CM |
405 | |
406 | #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) | |
3676f9ef | 407 | #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) |
4f04d8f0 CM |
408 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) |
409 | ||
410 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
411 | #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) | |
412 | ||
413 | /* | |
414 | * Ensure that there are not more swap files than can be encoded in the kernel | |
415 | * the PTEs. | |
416 | */ | |
417 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) | |
418 | ||
419 | /* | |
420 | * Encode and decode a file entry: | |
3676f9ef CM |
421 | * bits 0-1: present (must be zero) |
422 | * bit 2: PTE_FILE | |
423 | * bits 3-57: file offset / PAGE_SIZE | |
4f04d8f0 CM |
424 | */ |
425 | #define pte_file(pte) (pte_val(pte) & PTE_FILE) | |
3676f9ef CM |
426 | #define pte_to_pgoff(x) (pte_val(x) >> 3) |
427 | #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE) | |
4f04d8f0 | 428 | |
3676f9ef | 429 | #define PTE_FILE_MAX_BITS 55 |
4f04d8f0 CM |
430 | |
431 | extern int kern_addr_valid(unsigned long addr); | |
432 | ||
433 | #include <asm-generic/pgtable.h> | |
434 | ||
4f04d8f0 CM |
435 | #define pgtable_cache_init() do { } while (0) |
436 | ||
437 | #endif /* !__ASSEMBLY__ */ | |
438 | ||
439 | #endif /* __ASM_PGTABLE_H */ |