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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 | ||
2f4b829c | 19 | #include <asm/bug.h> |
4f04d8f0 CM |
20 | #include <asm/proc-fns.h> |
21 | ||
22 | #include <asm/memory.h> | |
23 | #include <asm/pgtable-hwdef.h> | |
3eca86e7 | 24 | #include <asm/pgtable-prot.h> |
4f04d8f0 CM |
25 | |
26 | /* | |
3e1907d5 | 27 | * VMALLOC range. |
08375198 | 28 | * |
f9040773 | 29 | * VMALLOC_START: beginning of the kernel vmalloc space |
3e1907d5 AB |
30 | * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space |
31 | * and fixed mappings | |
4f04d8f0 | 32 | */ |
f9040773 | 33 | #define VMALLOC_START (MODULES_END) |
08375198 | 34 | #define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K) |
4f04d8f0 | 35 | |
3bab79ed | 36 | #define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT)) |
4f04d8f0 | 37 | |
d016bf7e | 38 | #define FIRST_USER_ADDRESS 0UL |
4f04d8f0 CM |
39 | |
40 | #ifndef __ASSEMBLY__ | |
2f4b829c | 41 | |
961faac1 | 42 | #include <asm/fixmap.h> |
2f4b829c CM |
43 | #include <linux/mmdebug.h> |
44 | ||
4f04d8f0 CM |
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); | |
c79b954b | 47 | extern void __pud_error(const char *file, int line, unsigned long val); |
4f04d8f0 CM |
48 | extern void __pgd_error(const char *file, int line, unsigned long val); |
49 | ||
4f04d8f0 CM |
50 | /* |
51 | * ZERO_PAGE is a global shared page that is always zero: used | |
52 | * for zero-mapped memory areas etc.. | |
53 | */ | |
5227cfa7 | 54 | extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; |
2077be67 | 55 | #define ZERO_PAGE(vaddr) phys_to_page(__pa_symbol(empty_zero_page)) |
4f04d8f0 | 56 | |
7078db46 CM |
57 | #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte)) |
58 | ||
4f04d8f0 CM |
59 | #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT) |
60 | ||
61 | #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))) | |
62 | ||
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))) | |
7078db46 | 66 | |
4f04d8f0 CM |
67 | /* |
68 | * The following only work if pte_present(). Undefined behaviour otherwise. | |
69 | */ | |
84fe6826 | 70 | #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))) |
84fe6826 SC |
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)) | |
ec663d96 | 74 | #define pte_user_exec(pte) (!(pte_val(pte) & PTE_UXN)) |
93ef666a | 75 | #define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT)) |
4f04d8f0 | 76 | |
2f4b829c | 77 | #ifdef CONFIG_ARM64_HW_AFDBM |
b847415c | 78 | #define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY)) |
2f4b829c CM |
79 | #else |
80 | #define pte_hw_dirty(pte) (0) | |
81 | #endif | |
82 | #define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY)) | |
83 | #define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte)) | |
84 | ||
766ffb69 | 85 | #define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID)) |
ec663d96 CM |
86 | /* |
87 | * Execute-only user mappings do not have the PTE_USER bit set. All valid | |
88 | * kernel mappings have the PTE_UXN bit set. | |
89 | */ | |
90 | #define pte_valid_not_user(pte) \ | |
91 | ((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_UXN)) == (PTE_VALID | PTE_UXN)) | |
76c714be WD |
92 | #define pte_valid_young(pte) \ |
93 | ((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF)) | |
94 | ||
95 | /* | |
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. | |
99 | */ | |
100 | #define pte_accessible(mm, pte) \ | |
101 | (mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte)) | |
4f04d8f0 | 102 | |
b6d4f280 | 103 | static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot) |
44b6dfc5 | 104 | { |
b6d4f280 | 105 | pte_val(pte) &= ~pgprot_val(prot); |
44b6dfc5 SC |
106 | return pte; |
107 | } | |
108 | ||
b6d4f280 | 109 | static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot) |
44b6dfc5 | 110 | { |
b6d4f280 | 111 | pte_val(pte) |= pgprot_val(prot); |
44b6dfc5 SC |
112 | return pte; |
113 | } | |
114 | ||
b6d4f280 LA |
115 | static inline pte_t pte_wrprotect(pte_t pte) |
116 | { | |
117 | return clear_pte_bit(pte, __pgprot(PTE_WRITE)); | |
118 | } | |
119 | ||
120 | static inline pte_t pte_mkwrite(pte_t pte) | |
121 | { | |
122 | return set_pte_bit(pte, __pgprot(PTE_WRITE)); | |
123 | } | |
124 | ||
44b6dfc5 SC |
125 | static inline pte_t pte_mkclean(pte_t pte) |
126 | { | |
b6d4f280 | 127 | return clear_pte_bit(pte, __pgprot(PTE_DIRTY)); |
44b6dfc5 SC |
128 | } |
129 | ||
130 | static inline pte_t pte_mkdirty(pte_t pte) | |
131 | { | |
b6d4f280 | 132 | return set_pte_bit(pte, __pgprot(PTE_DIRTY)); |
44b6dfc5 SC |
133 | } |
134 | ||
135 | static inline pte_t pte_mkold(pte_t pte) | |
136 | { | |
b6d4f280 | 137 | return clear_pte_bit(pte, __pgprot(PTE_AF)); |
44b6dfc5 SC |
138 | } |
139 | ||
140 | static inline pte_t pte_mkyoung(pte_t pte) | |
141 | { | |
b6d4f280 | 142 | return set_pte_bit(pte, __pgprot(PTE_AF)); |
44b6dfc5 SC |
143 | } |
144 | ||
145 | static inline pte_t pte_mkspecial(pte_t pte) | |
146 | { | |
b6d4f280 | 147 | return set_pte_bit(pte, __pgprot(PTE_SPECIAL)); |
44b6dfc5 | 148 | } |
4f04d8f0 | 149 | |
93ef666a JL |
150 | static inline pte_t pte_mkcont(pte_t pte) |
151 | { | |
66b3923a DW |
152 | pte = set_pte_bit(pte, __pgprot(PTE_CONT)); |
153 | return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE)); | |
93ef666a JL |
154 | } |
155 | ||
156 | static inline pte_t pte_mknoncont(pte_t pte) | |
157 | { | |
158 | return clear_pte_bit(pte, __pgprot(PTE_CONT)); | |
159 | } | |
160 | ||
5ebe3a44 JM |
161 | static inline pte_t pte_clear_rdonly(pte_t pte) |
162 | { | |
163 | return clear_pte_bit(pte, __pgprot(PTE_RDONLY)); | |
164 | } | |
165 | ||
166 | static inline pte_t pte_mkpresent(pte_t pte) | |
167 | { | |
168 | return set_pte_bit(pte, __pgprot(PTE_VALID)); | |
169 | } | |
170 | ||
66b3923a DW |
171 | static inline pmd_t pmd_mkcont(pmd_t pmd) |
172 | { | |
173 | return __pmd(pmd_val(pmd) | PMD_SECT_CONT); | |
174 | } | |
175 | ||
4f04d8f0 CM |
176 | static inline void set_pte(pte_t *ptep, pte_t pte) |
177 | { | |
178 | *ptep = pte; | |
7f0b1bf0 CM |
179 | |
180 | /* | |
181 | * Only if the new pte is valid and kernel, otherwise TLB maintenance | |
182 | * or update_mmu_cache() have the necessary barriers. | |
183 | */ | |
ec663d96 | 184 | if (pte_valid_not_user(pte)) { |
7f0b1bf0 CM |
185 | dsb(ishst); |
186 | isb(); | |
187 | } | |
4f04d8f0 CM |
188 | } |
189 | ||
2f4b829c CM |
190 | struct mm_struct; |
191 | struct vm_area_struct; | |
192 | ||
4f04d8f0 CM |
193 | extern void __sync_icache_dcache(pte_t pteval, unsigned long addr); |
194 | ||
2f4b829c CM |
195 | /* |
196 | * PTE bits configuration in the presence of hardware Dirty Bit Management | |
197 | * (PTE_WRITE == PTE_DBM): | |
198 | * | |
199 | * Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw) | |
200 | * 0 0 | 1 0 0 | |
201 | * 0 1 | 1 1 0 | |
202 | * 1 0 | 1 0 1 | |
203 | * 1 1 | 0 1 x | |
204 | * | |
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: | |
207 | * | |
b847415c | 208 | * PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY) |
2f4b829c | 209 | */ |
4f04d8f0 CM |
210 | static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, |
211 | pte_t *ptep, pte_t pte) | |
212 | { | |
fdc69e7d | 213 | if (pte_present(pte)) { |
2f4b829c | 214 | if (pte_sw_dirty(pte) && pte_write(pte)) |
c2c93e5b SC |
215 | pte_val(pte) &= ~PTE_RDONLY; |
216 | else | |
217 | pte_val(pte) |= PTE_RDONLY; | |
ec663d96 | 218 | if (pte_user_exec(pte) && !pte_special(pte)) |
ac15bd63 | 219 | __sync_icache_dcache(pte, addr); |
02522463 WD |
220 | } |
221 | ||
2f4b829c CM |
222 | /* |
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). | |
226 | */ | |
82d34008 CM |
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)); | |
2f4b829c CM |
235 | } |
236 | ||
4f04d8f0 CM |
237 | set_pte(ptep, pte); |
238 | } | |
239 | ||
747a70e6 SC |
240 | #define __HAVE_ARCH_PTE_SAME |
241 | static inline int pte_same(pte_t pte_a, pte_t pte_b) | |
242 | { | |
243 | pteval_t lhs, rhs; | |
244 | ||
245 | lhs = pte_val(pte_a); | |
246 | rhs = pte_val(pte_b); | |
247 | ||
248 | if (pte_present(pte_a)) | |
249 | lhs &= ~PTE_RDONLY; | |
250 | ||
251 | if (pte_present(pte_b)) | |
252 | rhs &= ~PTE_RDONLY; | |
253 | ||
254 | return (lhs == rhs); | |
255 | } | |
256 | ||
4f04d8f0 CM |
257 | /* |
258 | * Huge pte definitions. | |
259 | */ | |
084bd298 SC |
260 | #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT)) |
261 | #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT)) | |
262 | ||
263 | /* | |
264 | * Hugetlb definitions. | |
265 | */ | |
66b3923a | 266 | #define HUGE_MAX_HSTATE 4 |
084bd298 SC |
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) | |
4f04d8f0 | 271 | |
4f04d8f0 CM |
272 | #define __HAVE_ARCH_PTE_SPECIAL |
273 | ||
29e56940 SC |
274 | static inline pte_t pud_pte(pud_t pud) |
275 | { | |
276 | return __pte(pud_val(pud)); | |
277 | } | |
278 | ||
279 | static inline pmd_t pud_pmd(pud_t pud) | |
280 | { | |
281 | return __pmd(pud_val(pud)); | |
282 | } | |
283 | ||
9c7e535f SC |
284 | static inline pte_t pmd_pte(pmd_t pmd) |
285 | { | |
286 | return __pte(pmd_val(pmd)); | |
287 | } | |
af074848 | 288 | |
9c7e535f SC |
289 | static inline pmd_t pte_pmd(pte_t pte) |
290 | { | |
291 | return __pmd(pte_val(pte)); | |
292 | } | |
af074848 | 293 | |
8ce837ce AB |
294 | static inline pgprot_t mk_sect_prot(pgprot_t prot) |
295 | { | |
296 | return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT); | |
297 | } | |
298 | ||
56166230 GK |
299 | #ifdef CONFIG_NUMA_BALANCING |
300 | /* | |
301 | * See the comment in include/asm-generic/pgtable.h | |
302 | */ | |
303 | static inline int pte_protnone(pte_t pte) | |
304 | { | |
305 | return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE; | |
306 | } | |
307 | ||
308 | static inline int pmd_protnone(pmd_t pmd) | |
309 | { | |
310 | return pte_protnone(pmd_pte(pmd)); | |
311 | } | |
312 | #endif | |
313 | ||
af074848 SC |
314 | /* |
315 | * THP definitions. | |
316 | */ | |
af074848 SC |
317 | |
318 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
319 | #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT)) | |
29e56940 | 320 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
af074848 | 321 | |
5bb1cc0f | 322 | #define pmd_present(pmd) pte_present(pmd_pte(pmd)) |
c164e038 | 323 | #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) |
9c7e535f SC |
324 | #define pmd_young(pmd) pte_young(pmd_pte(pmd)) |
325 | #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) | |
9c7e535f SC |
326 | #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) |
327 | #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) | |
ab4db1f2 | 328 | #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) |
9c7e535f SC |
329 | #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) |
330 | #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) | |
5bb1cc0f | 331 | #define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID)) |
af074848 | 332 | |
0dbd3b18 SP |
333 | #define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd)) |
334 | ||
9c7e535f SC |
335 | #define __HAVE_ARCH_PMD_WRITE |
336 | #define pmd_write(pmd) pte_write(pmd_pte(pmd)) | |
af074848 SC |
337 | |
338 | #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT)) | |
339 | ||
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) | |
343 | ||
29e56940 | 344 | #define pud_write(pud) pte_write(pud_pte(pud)) |
206a2a73 | 345 | #define pud_pfn(pud) (((pud_val(pud) & PUD_MASK) & PHYS_MASK) >> PAGE_SHIFT) |
af074848 | 346 | |
ceb21835 | 347 | #define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd)) |
af074848 | 348 | |
a501e324 CM |
349 | #define __pgprot_modify(prot,mask,bits) \ |
350 | __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) | |
351 | ||
4f04d8f0 CM |
352 | /* |
353 | * Mark the prot value as uncacheable and unbufferable. | |
354 | */ | |
355 | #define pgprot_noncached(prot) \ | |
de2db743 | 356 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN) |
4f04d8f0 | 357 | #define pgprot_writecombine(prot) \ |
de2db743 | 358 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN) |
d1e6dc91 LD |
359 | #define pgprot_device(prot) \ |
360 | __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN) | |
4f04d8f0 CM |
361 | #define __HAVE_PHYS_MEM_ACCESS_PROT |
362 | struct file; | |
363 | extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, | |
364 | unsigned long size, pgprot_t vma_prot); | |
365 | ||
366 | #define pmd_none(pmd) (!pmd_val(pmd)) | |
4f04d8f0 | 367 | |
ab4db1f2 | 368 | #define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT)) |
4f04d8f0 | 369 | |
36311607 MZ |
370 | #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ |
371 | PMD_TYPE_TABLE) | |
372 | #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \ | |
373 | PMD_TYPE_SECT) | |
374 | ||
cac4b8cd | 375 | #if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3 |
206a2a73 | 376 | #define pud_sect(pud) (0) |
523d6e9f | 377 | #define pud_table(pud) (1) |
206a2a73 SC |
378 | #else |
379 | #define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ | |
380 | PUD_TYPE_SECT) | |
523d6e9f | 381 | #define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \ |
382 | PUD_TYPE_TABLE) | |
206a2a73 | 383 | #endif |
36311607 | 384 | |
4f04d8f0 CM |
385 | static inline void set_pmd(pmd_t *pmdp, pmd_t pmd) |
386 | { | |
387 | *pmdp = pmd; | |
98f7685e | 388 | dsb(ishst); |
7f0b1bf0 | 389 | isb(); |
4f04d8f0 CM |
390 | } |
391 | ||
392 | static inline void pmd_clear(pmd_t *pmdp) | |
393 | { | |
394 | set_pmd(pmdp, __pmd(0)); | |
395 | } | |
396 | ||
dca56dca | 397 | static inline phys_addr_t pmd_page_paddr(pmd_t pmd) |
4f04d8f0 | 398 | { |
dca56dca | 399 | return pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK; |
4f04d8f0 CM |
400 | } |
401 | ||
053520f7 MR |
402 | /* Find an entry in the third-level page table. */ |
403 | #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) | |
404 | ||
dca56dca MR |
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)))) | |
053520f7 MR |
407 | |
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) | |
412 | ||
961faac1 MR |
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) | |
416 | ||
4f04d8f0 CM |
417 | #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK)) |
418 | ||
6533945a AB |
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)))) | |
421 | ||
4f04d8f0 CM |
422 | /* |
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. | |
425 | */ | |
426 | #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot) | |
427 | ||
9f25e6ad | 428 | #if CONFIG_PGTABLE_LEVELS > 2 |
4f04d8f0 | 429 | |
7078db46 CM |
430 | #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd)) |
431 | ||
4f04d8f0 | 432 | #define pud_none(pud) (!pud_val(pud)) |
ab4db1f2 | 433 | #define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT)) |
4f04d8f0 CM |
434 | #define pud_present(pud) (pud_val(pud)) |
435 | ||
436 | static inline void set_pud(pud_t *pudp, pud_t pud) | |
437 | { | |
438 | *pudp = pud; | |
98f7685e | 439 | dsb(ishst); |
7f0b1bf0 | 440 | isb(); |
4f04d8f0 CM |
441 | } |
442 | ||
443 | static inline void pud_clear(pud_t *pudp) | |
444 | { | |
445 | set_pud(pudp, __pud(0)); | |
446 | } | |
447 | ||
dca56dca | 448 | static inline phys_addr_t pud_page_paddr(pud_t pud) |
4f04d8f0 | 449 | { |
dca56dca | 450 | return pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK; |
4f04d8f0 CM |
451 | } |
452 | ||
7078db46 CM |
453 | /* Find an entry in the second-level page table. */ |
454 | #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)) | |
455 | ||
dca56dca MR |
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)))) | |
7078db46 | 458 | |
961faac1 MR |
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) | |
7078db46 | 462 | |
5d96e0cb | 463 | #define pud_page(pud) pfn_to_page(__phys_to_pfn(pud_val(pud) & PHYS_MASK)) |
29e56940 | 464 | |
6533945a AB |
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)))) | |
467 | ||
dca56dca MR |
468 | #else |
469 | ||
470 | #define pud_page_paddr(pud) ({ BUILD_BUG(); 0; }) | |
471 | ||
961faac1 MR |
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() | |
476 | ||
6533945a AB |
477 | #define pmd_offset_kimg(dir,addr) ((pmd_t *)dir) |
478 | ||
9f25e6ad | 479 | #endif /* CONFIG_PGTABLE_LEVELS > 2 */ |
4f04d8f0 | 480 | |
9f25e6ad | 481 | #if CONFIG_PGTABLE_LEVELS > 3 |
c79b954b | 482 | |
7078db46 CM |
483 | #define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud)) |
484 | ||
c79b954b JL |
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)) | |
488 | ||
489 | static inline void set_pgd(pgd_t *pgdp, pgd_t pgd) | |
490 | { | |
491 | *pgdp = pgd; | |
492 | dsb(ishst); | |
493 | } | |
494 | ||
495 | static inline void pgd_clear(pgd_t *pgdp) | |
496 | { | |
497 | set_pgd(pgdp, __pgd(0)); | |
498 | } | |
499 | ||
dca56dca | 500 | static inline phys_addr_t pgd_page_paddr(pgd_t pgd) |
c79b954b | 501 | { |
dca56dca | 502 | return pgd_val(pgd) & PHYS_MASK & (s32)PAGE_MASK; |
c79b954b JL |
503 | } |
504 | ||
7078db46 CM |
505 | /* Find an entry in the frst-level page table. */ |
506 | #define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)) | |
507 | ||
dca56dca MR |
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)))) | |
7078db46 | 510 | |
961faac1 MR |
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) | |
7078db46 | 514 | |
5d96e0cb JL |
515 | #define pgd_page(pgd) pfn_to_page(__phys_to_pfn(pgd_val(pgd) & PHYS_MASK)) |
516 | ||
6533945a AB |
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)))) | |
519 | ||
dca56dca MR |
520 | #else |
521 | ||
522 | #define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;}) | |
523 | ||
961faac1 MR |
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() | |
528 | ||
6533945a AB |
529 | #define pud_offset_kimg(dir,addr) ((pud_t *)dir) |
530 | ||
9f25e6ad | 531 | #endif /* CONFIG_PGTABLE_LEVELS > 3 */ |
c79b954b | 532 | |
7078db46 CM |
533 | #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd)) |
534 | ||
4f04d8f0 CM |
535 | /* to find an entry in a page-table-directory */ |
536 | #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1)) | |
537 | ||
dca56dca MR |
538 | #define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr)) |
539 | ||
540 | #define pgd_offset(mm, addr) (pgd_offset_raw((mm)->pgd, (addr))) | |
4f04d8f0 CM |
541 | |
542 | /* to find an entry in a kernel page-table-directory */ | |
543 | #define pgd_offset_k(addr) pgd_offset(&init_mm, addr) | |
544 | ||
961faac1 MR |
545 | #define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr)) |
546 | #define pgd_clear_fixmap() clear_fixmap(FIX_PGD) | |
547 | ||
4f04d8f0 CM |
548 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
549 | { | |
a6fadf7e | 550 | const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY | |
1a541b4e | 551 | PTE_PROT_NONE | PTE_VALID | PTE_WRITE; |
2f4b829c CM |
552 | /* preserve the hardware dirty information */ |
553 | if (pte_hw_dirty(pte)) | |
62d96c71 | 554 | pte = pte_mkdirty(pte); |
4f04d8f0 CM |
555 | pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask); |
556 | return pte; | |
557 | } | |
558 | ||
9c7e535f SC |
559 | static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) |
560 | { | |
561 | return pte_pmd(pte_modify(pmd_pte(pmd), newprot)); | |
562 | } | |
563 | ||
2f4b829c | 564 | #ifdef CONFIG_ARM64_HW_AFDBM |
66dbd6e6 CM |
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); | |
569 | ||
282aa705 CM |
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) | |
575 | { | |
576 | return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty); | |
577 | } | |
578 | #endif | |
579 | ||
2f4b829c CM |
580 | /* |
581 | * Atomic pte/pmd modifications. | |
582 | */ | |
583 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG | |
06485053 | 584 | static inline int __ptep_test_and_clear_young(pte_t *ptep) |
2f4b829c CM |
585 | { |
586 | pteval_t pteval; | |
587 | unsigned int tmp, res; | |
588 | ||
06485053 | 589 | asm volatile("// __ptep_test_and_clear_young\n" |
2f4b829c CM |
590 | " prfm pstl1strm, %2\n" |
591 | "1: ldxr %0, %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" | |
595 | " cbnz %w1, 1b\n" | |
596 | : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)), "=&r" (res) | |
597 | : "L" (~PTE_AF), "I" (ilog2(PTE_AF))); | |
598 | ||
599 | return res; | |
600 | } | |
601 | ||
06485053 CM |
602 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
603 | unsigned long address, | |
604 | pte_t *ptep) | |
605 | { | |
606 | return __ptep_test_and_clear_young(ptep); | |
607 | } | |
608 | ||
2f4b829c CM |
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, | |
613 | pmd_t *pmdp) | |
614 | { | |
615 | return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp); | |
616 | } | |
617 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
618 | ||
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) | |
622 | { | |
623 | pteval_t old_pteval; | |
624 | unsigned int tmp; | |
625 | ||
626 | asm volatile("// ptep_get_and_clear\n" | |
627 | " prfm pstl1strm, %2\n" | |
628 | "1: ldxr %0, %2\n" | |
629 | " stxr %w1, xzr, %2\n" | |
630 | " cbnz %w1, 1b\n" | |
631 | : "=&r" (old_pteval), "=&r" (tmp), "+Q" (pte_val(*ptep))); | |
632 | ||
633 | return __pte(old_pteval); | |
634 | } | |
635 | ||
636 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
911f56ee CM |
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) | |
2f4b829c CM |
640 | { |
641 | return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp)); | |
642 | } | |
643 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
644 | ||
645 | /* | |
646 | * ptep_set_wrprotect - mark read-only while trasferring potential hardware | |
647 | * dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit. | |
648 | */ | |
649 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT | |
650 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep) | |
651 | { | |
652 | pteval_t pteval; | |
653 | unsigned long tmp; | |
654 | ||
655 | asm volatile("// ptep_set_wrprotect\n" | |
656 | " prfm pstl1strm, %2\n" | |
657 | "1: ldxr %0, %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" | |
663 | " cbnz %w1, 1b\n" | |
664 | : "=&r" (pteval), "=&r" (tmp), "+Q" (pte_val(*ptep)) | |
665 | : "r" (PTE_DIRTY|PTE_RDONLY), "L" (PTE_RDONLY), "L" (~PTE_WRITE) | |
666 | : "cc"); | |
667 | } | |
668 | ||
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) | |
673 | { | |
674 | ptep_set_wrprotect(mm, address, (pte_t *)pmdp); | |
675 | } | |
676 | #endif | |
677 | #endif /* CONFIG_ARM64_HW_AFDBM */ | |
678 | ||
4f04d8f0 CM |
679 | extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
680 | extern pgd_t idmap_pg_dir[PTRS_PER_PGD]; | |
681 | ||
4f04d8f0 CM |
682 | /* |
683 | * Encode and decode a swap entry: | |
3676f9ef | 684 | * bits 0-1: present (must be zero) |
9b3e661e KS |
685 | * bits 2-7: swap type |
686 | * bits 8-57: swap offset | |
fdc69e7d | 687 | * bit 58: PTE_PROT_NONE (must be zero) |
4f04d8f0 | 688 | */ |
9b3e661e | 689 | #define __SWP_TYPE_SHIFT 2 |
4f04d8f0 | 690 | #define __SWP_TYPE_BITS 6 |
9b3e661e | 691 | #define __SWP_OFFSET_BITS 50 |
4f04d8f0 CM |
692 | #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) |
693 | #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) | |
3676f9ef | 694 | #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1) |
4f04d8f0 CM |
695 | |
696 | #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) | |
3676f9ef | 697 | #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK) |
4f04d8f0 CM |
698 | #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) |
699 | ||
700 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
701 | #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) | |
702 | ||
703 | /* | |
704 | * Ensure that there are not more swap files than can be encoded in the kernel | |
aad9061b | 705 | * PTEs. |
4f04d8f0 CM |
706 | */ |
707 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS) | |
708 | ||
4f04d8f0 CM |
709 | extern int kern_addr_valid(unsigned long addr); |
710 | ||
711 | #include <asm-generic/pgtable.h> | |
712 | ||
39b5be9b WD |
713 | void pgd_cache_init(void); |
714 | #define pgtable_cache_init pgd_cache_init | |
4f04d8f0 | 715 | |
cba3574f WD |
716 | /* |
717 | * On AArch64, the cache coherency is handled via the set_pte_at() function. | |
718 | */ | |
719 | static inline void update_mmu_cache(struct vm_area_struct *vma, | |
720 | unsigned long addr, pte_t *ptep) | |
721 | { | |
722 | /* | |
120798d2 WD |
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. | |
cba3574f | 726 | */ |
cba3574f WD |
727 | } |
728 | ||
729 | #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0) | |
730 | ||
7db743c6 CM |
731 | #define kc_vaddr_to_offset(v) ((v) & ~VA_START) |
732 | #define kc_offset_to_vaddr(o) ((o) | VA_START) | |
733 | ||
4f04d8f0 CM |
734 | #endif /* !__ASSEMBLY__ */ |
735 | ||
736 | #endif /* __ASM_PGTABLE_H */ |