Commit | Line | Data |
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c1cc1552 CM |
1 | /* |
2 | * Based on arch/arm/mm/mmu.c | |
3 | * | |
4 | * Copyright (C) 1995-2005 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
5a9e3e15 | 20 | #include <linux/cache.h> |
c1cc1552 CM |
21 | #include <linux/export.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/init.h> | |
98d2e153 TA |
25 | #include <linux/ioport.h> |
26 | #include <linux/kexec.h> | |
61bd93ce | 27 | #include <linux/libfdt.h> |
c1cc1552 CM |
28 | #include <linux/mman.h> |
29 | #include <linux/nodemask.h> | |
30 | #include <linux/memblock.h> | |
31 | #include <linux/fs.h> | |
2475ff9d | 32 | #include <linux/io.h> |
2077be67 | 33 | #include <linux/mm.h> |
6efd8499 | 34 | #include <linux/vmalloc.h> |
c1cc1552 | 35 | |
21ab99c2 | 36 | #include <asm/barrier.h> |
c1cc1552 | 37 | #include <asm/cputype.h> |
af86e597 | 38 | #include <asm/fixmap.h> |
068a17a5 | 39 | #include <asm/kasan.h> |
b433dce0 | 40 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
41 | #include <asm/sections.h> |
42 | #include <asm/setup.h> | |
43 | #include <asm/sizes.h> | |
44 | #include <asm/tlb.h> | |
c79b954b | 45 | #include <asm/memblock.h> |
c1cc1552 | 46 | #include <asm/mmu_context.h> |
1404d6f1 | 47 | #include <asm/ptdump.h> |
c1cc1552 | 48 | |
c0951366 | 49 | #define NO_BLOCK_MAPPINGS BIT(0) |
d27cfa1f | 50 | #define NO_CONT_MAPPINGS BIT(1) |
c0951366 | 51 | |
dd006da2 AB |
52 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
53 | ||
5a9e3e15 | 54 | u64 kimage_voffset __ro_after_init; |
a7f8de16 AB |
55 | EXPORT_SYMBOL(kimage_voffset); |
56 | ||
c1cc1552 CM |
57 | /* |
58 | * Empty_zero_page is a special page that is used for zero-initialized data | |
59 | * and COW. | |
60 | */ | |
5227cfa7 | 61 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
62 | EXPORT_SYMBOL(empty_zero_page); |
63 | ||
f9040773 AB |
64 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
65 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
66 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
67 | ||
c1cc1552 CM |
68 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
69 | unsigned long size, pgprot_t vma_prot) | |
70 | { | |
71 | if (!pfn_valid(pfn)) | |
72 | return pgprot_noncached(vma_prot); | |
73 | else if (file->f_flags & O_SYNC) | |
74 | return pgprot_writecombine(vma_prot); | |
75 | return vma_prot; | |
76 | } | |
77 | EXPORT_SYMBOL(phys_mem_access_prot); | |
78 | ||
f4710445 | 79 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 80 | { |
7142392d SP |
81 | phys_addr_t phys; |
82 | void *ptr; | |
83 | ||
21ab99c2 | 84 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
f4710445 MR |
85 | |
86 | /* | |
87 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
88 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
89 | * any level of table. | |
90 | */ | |
91 | ptr = pte_set_fixmap(phys); | |
92 | ||
21ab99c2 MR |
93 | memset(ptr, 0, PAGE_SIZE); |
94 | ||
f4710445 MR |
95 | /* |
96 | * Implicit barriers also ensure the zeroed page is visible to the page | |
97 | * table walker | |
98 | */ | |
99 | pte_clear_fixmap(); | |
100 | ||
101 | return phys; | |
c1cc1552 CM |
102 | } |
103 | ||
e98216b5 AB |
104 | static bool pgattr_change_is_safe(u64 old, u64 new) |
105 | { | |
106 | /* | |
107 | * The following mapping attributes may be updated in live | |
108 | * kernel mappings without the need for break-before-make. | |
109 | */ | |
110 | static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE; | |
111 | ||
141d1497 AB |
112 | /* creating or taking down mappings is always safe */ |
113 | if (old == 0 || new == 0) | |
114 | return true; | |
115 | ||
116 | /* live contiguous mappings may not be manipulated at all */ | |
117 | if ((old | new) & PTE_CONT) | |
118 | return false; | |
119 | ||
120 | return ((old ^ new) & ~mask) == 0; | |
e98216b5 AB |
121 | } |
122 | ||
d27cfa1f AB |
123 | static void init_pte(pmd_t *pmd, unsigned long addr, unsigned long end, |
124 | phys_addr_t phys, pgprot_t prot) | |
c1cc1552 CM |
125 | { |
126 | pte_t *pte; | |
127 | ||
f4710445 | 128 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 129 | do { |
e98216b5 AB |
130 | pte_t old_pte = *pte; |
131 | ||
e393cf40 | 132 | set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot)); |
e98216b5 AB |
133 | |
134 | /* | |
135 | * After the PTE entry has been populated once, we | |
136 | * only allow updates to the permission attributes. | |
137 | */ | |
138 | BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte))); | |
139 | ||
e393cf40 | 140 | phys += PAGE_SIZE; |
667c2759 | 141 | } while (pte++, addr += PAGE_SIZE, addr != end); |
f4710445 MR |
142 | |
143 | pte_clear_fixmap(); | |
c1cc1552 CM |
144 | } |
145 | ||
d27cfa1f AB |
146 | static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr, |
147 | unsigned long end, phys_addr_t phys, | |
148 | pgprot_t prot, | |
149 | phys_addr_t (*pgtable_alloc)(void), | |
150 | int flags) | |
c1cc1552 | 151 | { |
c1cc1552 CM |
152 | unsigned long next; |
153 | ||
d27cfa1f AB |
154 | BUG_ON(pmd_sect(*pmd)); |
155 | if (pmd_none(*pmd)) { | |
156 | phys_addr_t pte_phys; | |
132233a7 | 157 | BUG_ON(!pgtable_alloc); |
d27cfa1f AB |
158 | pte_phys = pgtable_alloc(); |
159 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); | |
c1cc1552 | 160 | } |
d27cfa1f AB |
161 | BUG_ON(pmd_bad(*pmd)); |
162 | ||
163 | do { | |
164 | pgprot_t __prot = prot; | |
165 | ||
166 | next = pte_cont_addr_end(addr, end); | |
167 | ||
168 | /* use a contiguous mapping if the range is suitably aligned */ | |
169 | if ((((addr | next | phys) & ~CONT_PTE_MASK) == 0) && | |
170 | (flags & NO_CONT_MAPPINGS) == 0) | |
171 | __prot = __pgprot(pgprot_val(prot) | PTE_CONT); | |
172 | ||
173 | init_pte(pmd, addr, next, phys, __prot); | |
174 | ||
175 | phys += next - addr; | |
176 | } while (addr = next, addr != end); | |
177 | } | |
178 | ||
179 | static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end, | |
180 | phys_addr_t phys, pgprot_t prot, | |
181 | phys_addr_t (*pgtable_alloc)(void), int flags) | |
182 | { | |
183 | unsigned long next; | |
184 | pmd_t *pmd; | |
c1cc1552 | 185 | |
f4710445 | 186 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 | 187 | do { |
e98216b5 AB |
188 | pmd_t old_pmd = *pmd; |
189 | ||
c1cc1552 | 190 | next = pmd_addr_end(addr, end); |
e98216b5 | 191 | |
c1cc1552 | 192 | /* try section mapping first */ |
83863f25 | 193 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
c0951366 | 194 | (flags & NO_BLOCK_MAPPINGS) == 0) { |
d81bbe6d | 195 | pmd_set_huge(pmd, phys, prot); |
e98216b5 | 196 | |
a55f9929 | 197 | /* |
e98216b5 AB |
198 | * After the PMD entry has been populated once, we |
199 | * only allow updates to the permission attributes. | |
a55f9929 | 200 | */ |
e98216b5 AB |
201 | BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd), |
202 | pmd_val(*pmd))); | |
a55f9929 | 203 | } else { |
d27cfa1f AB |
204 | alloc_init_cont_pte(pmd, addr, next, phys, prot, |
205 | pgtable_alloc, flags); | |
e98216b5 AB |
206 | |
207 | BUG_ON(pmd_val(old_pmd) != 0 && | |
208 | pmd_val(old_pmd) != pmd_val(*pmd)); | |
a55f9929 | 209 | } |
c1cc1552 CM |
210 | phys += next - addr; |
211 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
212 | |
213 | pmd_clear_fixmap(); | |
c1cc1552 CM |
214 | } |
215 | ||
d27cfa1f AB |
216 | static void alloc_init_cont_pmd(pud_t *pud, unsigned long addr, |
217 | unsigned long end, phys_addr_t phys, | |
218 | pgprot_t prot, | |
219 | phys_addr_t (*pgtable_alloc)(void), int flags) | |
220 | { | |
221 | unsigned long next; | |
222 | ||
223 | /* | |
224 | * Check for initial section mappings in the pgd/pud. | |
225 | */ | |
226 | BUG_ON(pud_sect(*pud)); | |
227 | if (pud_none(*pud)) { | |
228 | phys_addr_t pmd_phys; | |
229 | BUG_ON(!pgtable_alloc); | |
230 | pmd_phys = pgtable_alloc(); | |
231 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); | |
232 | } | |
233 | BUG_ON(pud_bad(*pud)); | |
234 | ||
235 | do { | |
236 | pgprot_t __prot = prot; | |
237 | ||
238 | next = pmd_cont_addr_end(addr, end); | |
239 | ||
240 | /* use a contiguous mapping if the range is suitably aligned */ | |
241 | if ((((addr | next | phys) & ~CONT_PMD_MASK) == 0) && | |
242 | (flags & NO_CONT_MAPPINGS) == 0) | |
243 | __prot = __pgprot(pgprot_val(prot) | PTE_CONT); | |
244 | ||
245 | init_pmd(pud, addr, next, phys, __prot, pgtable_alloc, flags); | |
246 | ||
247 | phys += next - addr; | |
248 | } while (addr = next, addr != end); | |
249 | } | |
250 | ||
da141706 LA |
251 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
252 | unsigned long phys) | |
253 | { | |
254 | if (PAGE_SHIFT != 12) | |
255 | return false; | |
256 | ||
257 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
258 | return false; | |
259 | ||
260 | return true; | |
261 | } | |
262 | ||
11509a30 | 263 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 264 | phys_addr_t phys, pgprot_t prot, |
53e1b329 | 265 | phys_addr_t (*pgtable_alloc)(void), |
c0951366 | 266 | int flags) |
c1cc1552 | 267 | { |
c79b954b | 268 | pud_t *pud; |
c1cc1552 CM |
269 | unsigned long next; |
270 | ||
c79b954b | 271 | if (pgd_none(*pgd)) { |
132233a7 LA |
272 | phys_addr_t pud_phys; |
273 | BUG_ON(!pgtable_alloc); | |
274 | pud_phys = pgtable_alloc(); | |
f4710445 | 275 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
276 | } |
277 | BUG_ON(pgd_bad(*pgd)); | |
278 | ||
f4710445 | 279 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 | 280 | do { |
e98216b5 AB |
281 | pud_t old_pud = *pud; |
282 | ||
c1cc1552 | 283 | next = pud_addr_end(addr, end); |
206a2a73 SC |
284 | |
285 | /* | |
286 | * For 4K granule only, attempt to put down a 1GB block | |
287 | */ | |
c0951366 AB |
288 | if (use_1G_block(addr, next, phys) && |
289 | (flags & NO_BLOCK_MAPPINGS) == 0) { | |
c661cb1c | 290 | pud_set_huge(pud, phys, prot); |
206a2a73 SC |
291 | |
292 | /* | |
e98216b5 AB |
293 | * After the PUD entry has been populated once, we |
294 | * only allow updates to the permission attributes. | |
206a2a73 | 295 | */ |
e98216b5 AB |
296 | BUG_ON(!pgattr_change_is_safe(pud_val(old_pud), |
297 | pud_val(*pud))); | |
206a2a73 | 298 | } else { |
d27cfa1f AB |
299 | alloc_init_cont_pmd(pud, addr, next, phys, prot, |
300 | pgtable_alloc, flags); | |
e98216b5 AB |
301 | |
302 | BUG_ON(pud_val(old_pud) != 0 && | |
303 | pud_val(old_pud) != pud_val(*pud)); | |
206a2a73 | 304 | } |
c1cc1552 CM |
305 | phys += next - addr; |
306 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
307 | |
308 | pud_clear_fixmap(); | |
c1cc1552 CM |
309 | } |
310 | ||
40f87d31 AB |
311 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
312 | unsigned long virt, phys_addr_t size, | |
313 | pgprot_t prot, | |
314 | phys_addr_t (*pgtable_alloc)(void), | |
c0951366 | 315 | int flags) |
c1cc1552 CM |
316 | { |
317 | unsigned long addr, length, end, next; | |
40f87d31 | 318 | pgd_t *pgd = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 319 | |
cc5d2b3b MR |
320 | /* |
321 | * If the virtual and physical address don't have the same offset | |
322 | * within a page, we cannot map the region as the caller expects. | |
323 | */ | |
324 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
325 | return; | |
326 | ||
9c4e08a3 | 327 | phys &= PAGE_MASK; |
c1cc1552 CM |
328 | addr = virt & PAGE_MASK; |
329 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
330 | ||
c1cc1552 CM |
331 | end = addr + length; |
332 | do { | |
333 | next = pgd_addr_end(addr, end); | |
53e1b329 | 334 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc, |
c0951366 | 335 | flags); |
c1cc1552 CM |
336 | phys += next - addr; |
337 | } while (pgd++, addr = next, addr != end); | |
338 | } | |
339 | ||
1378dc3d | 340 | static phys_addr_t pgd_pgtable_alloc(void) |
da141706 | 341 | { |
21ab99c2 | 342 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
1378dc3d AB |
343 | if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) |
344 | BUG(); | |
21ab99c2 MR |
345 | |
346 | /* Ensure the zeroed page is visible to the page table walker */ | |
347 | dsb(ishst); | |
f4710445 | 348 | return __pa(ptr); |
da141706 LA |
349 | } |
350 | ||
132233a7 LA |
351 | /* |
352 | * This function can only be used to modify existing table entries, | |
353 | * without allocating new levels of table. Note that this permits the | |
354 | * creation of new section or page entries. | |
355 | */ | |
356 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 357 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
358 | { |
359 | if (virt < VMALLOC_START) { | |
360 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
361 | &phys, virt); | |
362 | return; | |
363 | } | |
d27cfa1f AB |
364 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, |
365 | NO_CONT_MAPPINGS); | |
d7ecbddf MS |
366 | } |
367 | ||
8ce837ce AB |
368 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
369 | unsigned long virt, phys_addr_t size, | |
f14c66ce | 370 | pgprot_t prot, bool page_mappings_only) |
8ce837ce | 371 | { |
c0951366 AB |
372 | int flags = 0; |
373 | ||
1378dc3d AB |
374 | BUG_ON(mm == &init_mm); |
375 | ||
c0951366 | 376 | if (page_mappings_only) |
d27cfa1f | 377 | flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; |
c0951366 | 378 | |
11509a30 | 379 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
c0951366 | 380 | pgd_pgtable_alloc, flags); |
d7ecbddf MS |
381 | } |
382 | ||
aa8c09be AB |
383 | static void update_mapping_prot(phys_addr_t phys, unsigned long virt, |
384 | phys_addr_t size, pgprot_t prot) | |
da141706 LA |
385 | { |
386 | if (virt < VMALLOC_START) { | |
aa8c09be | 387 | pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n", |
da141706 LA |
388 | &phys, virt); |
389 | return; | |
390 | } | |
391 | ||
d27cfa1f AB |
392 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, |
393 | NO_CONT_MAPPINGS); | |
aa8c09be AB |
394 | |
395 | /* flush the TLBs after updating live kernel mappings */ | |
396 | flush_tlb_kernel_range(virt, virt + size); | |
da141706 LA |
397 | } |
398 | ||
98d2e153 TA |
399 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, |
400 | phys_addr_t end, pgprot_t prot, int flags) | |
401 | { | |
402 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), end - start, | |
403 | prot, early_pgtable_alloc, flags); | |
404 | } | |
405 | ||
406 | void __init mark_linear_text_alias_ro(void) | |
407 | { | |
408 | /* | |
409 | * Remove the write permissions from the linear alias of .text/.rodata | |
410 | */ | |
411 | update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text), | |
412 | (unsigned long)__init_begin - (unsigned long)_text, | |
413 | PAGE_KERNEL_RO); | |
414 | } | |
415 | ||
416 | static void __init map_mem(pgd_t *pgd) | |
da141706 | 417 | { |
eac8017f MC |
418 | phys_addr_t kernel_start = __pa_symbol(_text); |
419 | phys_addr_t kernel_end = __pa_symbol(__init_begin); | |
98d2e153 | 420 | struct memblock_region *reg; |
c0951366 AB |
421 | int flags = 0; |
422 | ||
423 | if (debug_pagealloc_enabled()) | |
d27cfa1f | 424 | flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS; |
068a17a5 | 425 | |
da141706 | 426 | /* |
f9040773 AB |
427 | * Take care not to create a writable alias for the |
428 | * read-only text and rodata sections of the kernel image. | |
98d2e153 TA |
429 | * So temporarily mark them as NOMAP to skip mappings in |
430 | * the following for-loop | |
da141706 | 431 | */ |
98d2e153 TA |
432 | memblock_mark_nomap(kernel_start, kernel_end - kernel_start); |
433 | #ifdef CONFIG_KEXEC_CORE | |
434 | if (crashk_res.end) | |
435 | memblock_mark_nomap(crashk_res.start, | |
436 | resource_size(&crashk_res)); | |
437 | #endif | |
068a17a5 | 438 | |
98d2e153 TA |
439 | /* map all the memory banks */ |
440 | for_each_memblock(memory, reg) { | |
441 | phys_addr_t start = reg->base; | |
442 | phys_addr_t end = start + reg->size; | |
da141706 | 443 | |
98d2e153 TA |
444 | if (start >= end) |
445 | break; | |
446 | if (memblock_is_nomap(reg)) | |
447 | continue; | |
448 | ||
449 | __map_memblock(pgd, start, end, PAGE_KERNEL, flags); | |
450 | } | |
f9040773 AB |
451 | |
452 | /* | |
5ea5306c AB |
453 | * Map the linear alias of the [_text, __init_begin) interval |
454 | * as non-executable now, and remove the write permission in | |
455 | * mark_linear_text_alias_ro() below (which will be called after | |
456 | * alternative patching has completed). This makes the contents | |
457 | * of the region accessible to subsystems such as hibernate, | |
458 | * but protects it from inadvertent modification or execution. | |
d27cfa1f AB |
459 | * Note that contiguous mappings cannot be remapped in this way, |
460 | * so we should avoid them here. | |
f9040773 | 461 | */ |
98d2e153 TA |
462 | __map_memblock(pgd, kernel_start, kernel_end, |
463 | PAGE_KERNEL, NO_CONT_MAPPINGS); | |
464 | memblock_clear_nomap(kernel_start, kernel_end - kernel_start); | |
da141706 | 465 | |
98d2e153 | 466 | #ifdef CONFIG_KEXEC_CORE |
5ea5306c | 467 | /* |
98d2e153 TA |
468 | * Use page-level mappings here so that we can shrink the region |
469 | * in page granularity and put back unused memory to buddy system | |
470 | * through /sys/kernel/kexec_crash_size interface. | |
5ea5306c | 471 | */ |
98d2e153 TA |
472 | if (crashk_res.end) { |
473 | __map_memblock(pgd, crashk_res.start, crashk_res.end + 1, | |
474 | PAGE_KERNEL, | |
475 | NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS); | |
476 | memblock_clear_nomap(crashk_res.start, | |
477 | resource_size(&crashk_res)); | |
c1cc1552 | 478 | } |
98d2e153 | 479 | #endif |
c1cc1552 CM |
480 | } |
481 | ||
da141706 LA |
482 | void mark_rodata_ro(void) |
483 | { | |
2f39b5f9 | 484 | unsigned long section_size; |
f9040773 | 485 | |
2f39b5f9 | 486 | /* |
9fdc14c5 AB |
487 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
488 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 489 | */ |
9fdc14c5 | 490 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
aa8c09be | 491 | update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata, |
2f39b5f9 | 492 | section_size, PAGE_KERNEL_RO); |
e98216b5 | 493 | |
1404d6f1 | 494 | debug_checkwx(); |
da141706 | 495 | } |
da141706 | 496 | |
2c09ec06 | 497 | static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end, |
d27cfa1f | 498 | pgprot_t prot, struct vm_struct *vma, |
92bbd16e | 499 | int flags, unsigned long vm_flags) |
068a17a5 | 500 | { |
2077be67 | 501 | phys_addr_t pa_start = __pa_symbol(va_start); |
068a17a5 MR |
502 | unsigned long size = va_end - va_start; |
503 | ||
504 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
505 | BUG_ON(!PAGE_ALIGNED(size)); | |
506 | ||
507 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
d27cfa1f | 508 | early_pgtable_alloc, flags); |
f9040773 | 509 | |
92bbd16e WD |
510 | if (!(vm_flags & VM_NO_GUARD)) |
511 | size += PAGE_SIZE; | |
512 | ||
f9040773 AB |
513 | vma->addr = va_start; |
514 | vma->phys_addr = pa_start; | |
515 | vma->size = size; | |
92bbd16e | 516 | vma->flags = VM_MAP | vm_flags; |
f9040773 AB |
517 | vma->caller = __builtin_return_address(0); |
518 | ||
519 | vm_area_add_early(vma); | |
068a17a5 MR |
520 | } |
521 | ||
28b066da AB |
522 | static int __init parse_rodata(char *arg) |
523 | { | |
524 | return strtobool(arg, &rodata_enabled); | |
525 | } | |
526 | early_param("rodata", parse_rodata); | |
527 | ||
068a17a5 MR |
528 | /* |
529 | * Create fine-grained mappings for the kernel. | |
530 | */ | |
531 | static void __init map_kernel(pgd_t *pgd) | |
532 | { | |
2ebe088b AB |
533 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext, |
534 | vmlinux_initdata, vmlinux_data; | |
068a17a5 | 535 | |
28b066da AB |
536 | /* |
537 | * External debuggers may need to write directly to the text | |
538 | * mapping to install SW breakpoints. Allow this (only) when | |
539 | * explicitly requested with rodata=off. | |
540 | */ | |
541 | pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; | |
542 | ||
d27cfa1f AB |
543 | /* |
544 | * Only rodata will be remapped with different permissions later on, | |
545 | * all other segments are allowed to use contiguous mappings. | |
546 | */ | |
92bbd16e WD |
547 | map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text, 0, |
548 | VM_NO_GUARD); | |
2ebe088b | 549 | map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL, |
92bbd16e | 550 | &vmlinux_rodata, NO_CONT_MAPPINGS, VM_NO_GUARD); |
2ebe088b | 551 | map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot, |
92bbd16e | 552 | &vmlinux_inittext, 0, VM_NO_GUARD); |
2ebe088b | 553 | map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL, |
92bbd16e WD |
554 | &vmlinux_initdata, 0, VM_NO_GUARD); |
555 | map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0); | |
068a17a5 | 556 | |
f9040773 AB |
557 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
558 | /* | |
559 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
560 | * live in the carveout for the swapper_pg_dir. We can simply | |
561 | * re-use the existing dir for the fixmap. | |
562 | */ | |
563 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
564 | *pgd_offset_k(FIXADDR_START)); | |
565 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
566 | /* | |
567 | * The fixmap shares its top level pgd entry with the kernel | |
568 | * mapping. This can really only occur when we are running | |
569 | * with 16k/4 levels, so we can simply reuse the pud level | |
570 | * entry instead. | |
571 | */ | |
572 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
573 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
2077be67 | 574 | __pud(__pa_symbol(bm_pmd) | PUD_TYPE_TABLE)); |
f9040773 AB |
575 | pud_clear_fixmap(); |
576 | } else { | |
577 | BUG(); | |
578 | } | |
068a17a5 MR |
579 | |
580 | kasan_copy_shadow(pgd); | |
581 | } | |
582 | ||
c1cc1552 CM |
583 | /* |
584 | * paging_init() sets up the page tables, initialises the zone memory | |
585 | * maps and sets up the zero page. | |
586 | */ | |
587 | void __init paging_init(void) | |
588 | { | |
068a17a5 MR |
589 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
590 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
591 | ||
592 | map_kernel(pgd); | |
593 | map_mem(pgd); | |
594 | ||
595 | /* | |
596 | * We want to reuse the original swapper_pg_dir so we don't have to | |
597 | * communicate the new address to non-coherent secondaries in | |
598 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
599 | * adrp+add rather than a load from some global variable. | |
600 | * | |
601 | * To do this we need to go via a temporary pgd. | |
602 | */ | |
603 | cpu_replace_ttbr1(__va(pgd_phys)); | |
12f043ff | 604 | memcpy(swapper_pg_dir, pgd, PGD_SIZE); |
2077be67 | 605 | cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); |
068a17a5 MR |
606 | |
607 | pgd_clear_fixmap(); | |
608 | memblock_free(pgd_phys, PAGE_SIZE); | |
609 | ||
610 | /* | |
611 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
612 | * allocated with it. | |
613 | */ | |
2077be67 | 614 | memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE, |
068a17a5 | 615 | SWAPPER_DIR_SIZE - PAGE_SIZE); |
c1cc1552 CM |
616 | } |
617 | ||
c1cc1552 CM |
618 | /* |
619 | * Check whether a kernel address is valid (derived from arch/x86/). | |
620 | */ | |
621 | int kern_addr_valid(unsigned long addr) | |
622 | { | |
623 | pgd_t *pgd; | |
624 | pud_t *pud; | |
625 | pmd_t *pmd; | |
626 | pte_t *pte; | |
627 | ||
628 | if ((((long)addr) >> VA_BITS) != -1UL) | |
629 | return 0; | |
630 | ||
631 | pgd = pgd_offset_k(addr); | |
632 | if (pgd_none(*pgd)) | |
633 | return 0; | |
634 | ||
635 | pud = pud_offset(pgd, addr); | |
636 | if (pud_none(*pud)) | |
637 | return 0; | |
638 | ||
206a2a73 SC |
639 | if (pud_sect(*pud)) |
640 | return pfn_valid(pud_pfn(*pud)); | |
641 | ||
c1cc1552 CM |
642 | pmd = pmd_offset(pud, addr); |
643 | if (pmd_none(*pmd)) | |
644 | return 0; | |
645 | ||
da6e4cb6 DA |
646 | if (pmd_sect(*pmd)) |
647 | return pfn_valid(pmd_pfn(*pmd)); | |
648 | ||
c1cc1552 CM |
649 | pte = pte_offset_kernel(pmd, addr); |
650 | if (pte_none(*pte)) | |
651 | return 0; | |
652 | ||
653 | return pfn_valid(pte_pfn(*pte)); | |
654 | } | |
655 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 656 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 657 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 658 | { |
0aad818b | 659 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 660 | } |
b433dce0 | 661 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 662 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 663 | { |
0aad818b | 664 | unsigned long addr = start; |
c1cc1552 CM |
665 | unsigned long next; |
666 | pgd_t *pgd; | |
667 | pud_t *pud; | |
668 | pmd_t *pmd; | |
669 | ||
670 | do { | |
671 | next = pmd_addr_end(addr, end); | |
672 | ||
673 | pgd = vmemmap_pgd_populate(addr, node); | |
674 | if (!pgd) | |
675 | return -ENOMEM; | |
676 | ||
677 | pud = vmemmap_pud_populate(pgd, addr, node); | |
678 | if (!pud) | |
679 | return -ENOMEM; | |
680 | ||
681 | pmd = pmd_offset(pud, addr); | |
682 | if (pmd_none(*pmd)) { | |
683 | void *p = NULL; | |
684 | ||
685 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
686 | if (!p) | |
687 | return -ENOMEM; | |
688 | ||
a501e324 | 689 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
690 | } else |
691 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
692 | } while (addr = next, addr != end); | |
693 | ||
694 | return 0; | |
695 | } | |
696 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 697 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
698 | { |
699 | } | |
c1cc1552 | 700 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 701 | |
af86e597 LA |
702 | static inline pud_t * fixmap_pud(unsigned long addr) |
703 | { | |
704 | pgd_t *pgd = pgd_offset_k(addr); | |
705 | ||
706 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
707 | ||
157962f5 | 708 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
709 | } |
710 | ||
711 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
712 | { | |
713 | pud_t *pud = fixmap_pud(addr); | |
714 | ||
715 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
716 | ||
157962f5 | 717 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
718 | } |
719 | ||
720 | static inline pte_t * fixmap_pte(unsigned long addr) | |
721 | { | |
157962f5 | 722 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
723 | } |
724 | ||
2077be67 LA |
725 | /* |
726 | * The p*d_populate functions call virt_to_phys implicitly so they can't be used | |
727 | * directly on kernel symbols (bm_p*d). This function is called too early to use | |
728 | * lm_alias so __p*d_populate functions must be used to populate with the | |
729 | * physical address from __pa_symbol. | |
730 | */ | |
af86e597 LA |
731 | void __init early_fixmap_init(void) |
732 | { | |
733 | pgd_t *pgd; | |
734 | pud_t *pud; | |
735 | pmd_t *pmd; | |
736 | unsigned long addr = FIXADDR_START; | |
737 | ||
738 | pgd = pgd_offset_k(addr); | |
f80fb3a3 | 739 | if (CONFIG_PGTABLE_LEVELS > 3 && |
2077be67 | 740 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) { |
f9040773 AB |
741 | /* |
742 | * We only end up here if the kernel mapping and the fixmap | |
743 | * share the top level pgd entry, which should only happen on | |
744 | * 16k/4 levels configurations. | |
745 | */ | |
746 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
747 | pud = pud_offset_kimg(pgd, addr); | |
748 | } else { | |
2077be67 LA |
749 | if (pgd_none(*pgd)) |
750 | __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE); | |
f9040773 AB |
751 | pud = fixmap_pud(addr); |
752 | } | |
2077be67 LA |
753 | if (pud_none(*pud)) |
754 | __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE); | |
157962f5 | 755 | pmd = fixmap_pmd(addr); |
2077be67 | 756 | __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE); |
af86e597 LA |
757 | |
758 | /* | |
759 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 760 | * we are not prepared: |
af86e597 LA |
761 | */ |
762 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
763 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
764 | ||
765 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
766 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
767 | WARN_ON(1); | |
768 | pr_warn("pmd %p != %p, %p\n", | |
769 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
770 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
771 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
772 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
773 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
774 | fix_to_virt(FIX_BTMAP_END)); | |
775 | ||
776 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
777 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
778 | } | |
779 | } | |
780 | ||
781 | void __set_fixmap(enum fixed_addresses idx, | |
782 | phys_addr_t phys, pgprot_t flags) | |
783 | { | |
784 | unsigned long addr = __fix_to_virt(idx); | |
785 | pte_t *pte; | |
786 | ||
b63dbef9 | 787 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
788 | |
789 | pte = fixmap_pte(addr); | |
790 | ||
791 | if (pgprot_val(flags)) { | |
792 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
793 | } else { | |
794 | pte_clear(&init_mm, addr, pte); | |
795 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
796 | } | |
797 | } | |
61bd93ce | 798 | |
f80fb3a3 | 799 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
800 | { |
801 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 802 | int offset; |
61bd93ce AB |
803 | void *dt_virt; |
804 | ||
805 | /* | |
806 | * Check whether the physical FDT address is set and meets the minimum | |
807 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
808 | * at least 8 bytes so that we can always access the magic and size |
809 | * fields of the FDT header after mapping the first chunk, double check | |
810 | * here if that is indeed the case. | |
61bd93ce AB |
811 | */ |
812 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
813 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
814 | return NULL; | |
815 | ||
816 | /* | |
817 | * Make sure that the FDT region can be mapped without the need to | |
818 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 819 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
820 | * |
821 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
822 | * be in the same PMD as the rest of the fixmap. | |
823 | * On 4k pages, we'll use section mappings for the FDT so we only | |
824 | * have to be in the same PUD. | |
825 | */ | |
826 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
827 | ||
b433dce0 SP |
828 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
829 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 830 | |
b433dce0 | 831 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
832 | dt_virt = (void *)dt_virt_base + offset; |
833 | ||
834 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
835 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
836 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 837 | |
04a84810 | 838 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
839 | return NULL; |
840 | ||
f80fb3a3 AB |
841 | *size = fdt_totalsize(dt_virt); |
842 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
843 | return NULL; |
844 | ||
f80fb3a3 | 845 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 846 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 847 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 848 | |
f80fb3a3 AB |
849 | return dt_virt; |
850 | } | |
61bd93ce | 851 | |
f80fb3a3 AB |
852 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
853 | { | |
854 | void *dt_virt; | |
855 | int size; | |
856 | ||
857 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
858 | if (!dt_virt) | |
859 | return NULL; | |
860 | ||
861 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
862 | return dt_virt; |
863 | } | |
324420bf AB |
864 | |
865 | int __init arch_ioremap_pud_supported(void) | |
866 | { | |
867 | /* only 4k granule supports level 1 block mappings */ | |
868 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
869 | } | |
870 | ||
871 | int __init arch_ioremap_pmd_supported(void) | |
872 | { | |
873 | return 1; | |
874 | } | |
875 | ||
876 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
877 | { | |
878 | BUG_ON(phys & ~PUD_MASK); | |
879 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
880 | return 1; | |
881 | } | |
882 | ||
883 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
884 | { | |
885 | BUG_ON(phys & ~PMD_MASK); | |
886 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
887 | return 1; | |
888 | } | |
889 | ||
890 | int pud_clear_huge(pud_t *pud) | |
891 | { | |
892 | if (!pud_sect(*pud)) | |
893 | return 0; | |
894 | pud_clear(pud); | |
895 | return 1; | |
896 | } | |
897 | ||
898 | int pmd_clear_huge(pmd_t *pmd) | |
899 | { | |
900 | if (!pmd_sect(*pmd)) | |
901 | return 0; | |
902 | pmd_clear(pmd); | |
903 | return 1; | |
904 | } |