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> | |
61bd93ce | 25 | #include <linux/libfdt.h> |
c1cc1552 CM |
26 | #include <linux/mman.h> |
27 | #include <linux/nodemask.h> | |
28 | #include <linux/memblock.h> | |
29 | #include <linux/fs.h> | |
2475ff9d | 30 | #include <linux/io.h> |
2077be67 | 31 | #include <linux/mm.h> |
c1cc1552 | 32 | |
21ab99c2 | 33 | #include <asm/barrier.h> |
c1cc1552 | 34 | #include <asm/cputype.h> |
af86e597 | 35 | #include <asm/fixmap.h> |
068a17a5 | 36 | #include <asm/kasan.h> |
b433dce0 | 37 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
38 | #include <asm/sections.h> |
39 | #include <asm/setup.h> | |
40 | #include <asm/sizes.h> | |
41 | #include <asm/tlb.h> | |
c79b954b | 42 | #include <asm/memblock.h> |
c1cc1552 | 43 | #include <asm/mmu_context.h> |
1404d6f1 | 44 | #include <asm/ptdump.h> |
c1cc1552 | 45 | |
dd006da2 AB |
46 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
47 | ||
5a9e3e15 | 48 | u64 kimage_voffset __ro_after_init; |
a7f8de16 AB |
49 | EXPORT_SYMBOL(kimage_voffset); |
50 | ||
c1cc1552 CM |
51 | /* |
52 | * Empty_zero_page is a special page that is used for zero-initialized data | |
53 | * and COW. | |
54 | */ | |
5227cfa7 | 55 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
56 | EXPORT_SYMBOL(empty_zero_page); |
57 | ||
f9040773 AB |
58 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
59 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
60 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
61 | ||
c1cc1552 CM |
62 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
63 | unsigned long size, pgprot_t vma_prot) | |
64 | { | |
65 | if (!pfn_valid(pfn)) | |
66 | return pgprot_noncached(vma_prot); | |
67 | else if (file->f_flags & O_SYNC) | |
68 | return pgprot_writecombine(vma_prot); | |
69 | return vma_prot; | |
70 | } | |
71 | EXPORT_SYMBOL(phys_mem_access_prot); | |
72 | ||
f4710445 | 73 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 74 | { |
7142392d SP |
75 | phys_addr_t phys; |
76 | void *ptr; | |
77 | ||
21ab99c2 | 78 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
f4710445 MR |
79 | |
80 | /* | |
81 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
82 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
83 | * any level of table. | |
84 | */ | |
85 | ptr = pte_set_fixmap(phys); | |
86 | ||
21ab99c2 MR |
87 | memset(ptr, 0, PAGE_SIZE); |
88 | ||
f4710445 MR |
89 | /* |
90 | * Implicit barriers also ensure the zeroed page is visible to the page | |
91 | * table walker | |
92 | */ | |
93 | pte_clear_fixmap(); | |
94 | ||
95 | return phys; | |
c1cc1552 CM |
96 | } |
97 | ||
e98216b5 AB |
98 | static bool pgattr_change_is_safe(u64 old, u64 new) |
99 | { | |
100 | /* | |
101 | * The following mapping attributes may be updated in live | |
102 | * kernel mappings without the need for break-before-make. | |
103 | */ | |
104 | static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE; | |
105 | ||
141d1497 AB |
106 | /* creating or taking down mappings is always safe */ |
107 | if (old == 0 || new == 0) | |
108 | return true; | |
109 | ||
110 | /* live contiguous mappings may not be manipulated at all */ | |
111 | if ((old | new) & PTE_CONT) | |
112 | return false; | |
113 | ||
114 | return ((old ^ new) & ~mask) == 0; | |
e98216b5 AB |
115 | } |
116 | ||
da141706 | 117 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
e393cf40 | 118 | unsigned long end, phys_addr_t phys, |
da141706 | 119 | pgprot_t prot, |
d81bbe6d | 120 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
121 | { |
122 | pte_t *pte; | |
123 | ||
4133af6c CM |
124 | BUG_ON(pmd_sect(*pmd)); |
125 | if (pmd_none(*pmd)) { | |
132233a7 LA |
126 | phys_addr_t pte_phys; |
127 | BUG_ON(!pgtable_alloc); | |
128 | pte_phys = pgtable_alloc(); | |
f4710445 | 129 | pte = pte_set_fixmap(pte_phys); |
f4710445 | 130 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
f4710445 | 131 | pte_clear_fixmap(); |
c1cc1552 | 132 | } |
a1c76574 | 133 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 134 | |
f4710445 | 135 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 136 | do { |
e98216b5 AB |
137 | pte_t old_pte = *pte; |
138 | ||
e393cf40 | 139 | set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot)); |
e98216b5 AB |
140 | |
141 | /* | |
142 | * After the PTE entry has been populated once, we | |
143 | * only allow updates to the permission attributes. | |
144 | */ | |
145 | BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte))); | |
146 | ||
e393cf40 | 147 | phys += PAGE_SIZE; |
667c2759 | 148 | } while (pte++, addr += PAGE_SIZE, addr != end); |
f4710445 MR |
149 | |
150 | pte_clear_fixmap(); | |
c1cc1552 CM |
151 | } |
152 | ||
11509a30 | 153 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 154 | phys_addr_t phys, pgprot_t prot, |
53e1b329 | 155 | phys_addr_t (*pgtable_alloc)(void), |
f14c66ce | 156 | bool page_mappings_only) |
c1cc1552 CM |
157 | { |
158 | pmd_t *pmd; | |
159 | unsigned long next; | |
160 | ||
161 | /* | |
162 | * Check for initial section mappings in the pgd/pud and remove them. | |
163 | */ | |
4133af6c CM |
164 | BUG_ON(pud_sect(*pud)); |
165 | if (pud_none(*pud)) { | |
132233a7 LA |
166 | phys_addr_t pmd_phys; |
167 | BUG_ON(!pgtable_alloc); | |
168 | pmd_phys = pgtable_alloc(); | |
f4710445 | 169 | pmd = pmd_set_fixmap(pmd_phys); |
f4710445 | 170 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
f4710445 | 171 | pmd_clear_fixmap(); |
c1cc1552 | 172 | } |
a1c76574 | 173 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 174 | |
f4710445 | 175 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 | 176 | do { |
e98216b5 AB |
177 | pmd_t old_pmd = *pmd; |
178 | ||
c1cc1552 | 179 | next = pmd_addr_end(addr, end); |
e98216b5 | 180 | |
c1cc1552 | 181 | /* try section mapping first */ |
83863f25 | 182 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
f14c66ce | 183 | !page_mappings_only) { |
d81bbe6d | 184 | pmd_set_huge(pmd, phys, prot); |
e98216b5 | 185 | |
a55f9929 | 186 | /* |
e98216b5 AB |
187 | * After the PMD entry has been populated once, we |
188 | * only allow updates to the permission attributes. | |
a55f9929 | 189 | */ |
e98216b5 AB |
190 | BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd), |
191 | pmd_val(*pmd))); | |
a55f9929 | 192 | } else { |
e393cf40 | 193 | alloc_init_pte(pmd, addr, next, phys, |
d81bbe6d | 194 | prot, pgtable_alloc); |
e98216b5 AB |
195 | |
196 | BUG_ON(pmd_val(old_pmd) != 0 && | |
197 | pmd_val(old_pmd) != pmd_val(*pmd)); | |
a55f9929 | 198 | } |
c1cc1552 CM |
199 | phys += next - addr; |
200 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
201 | |
202 | pmd_clear_fixmap(); | |
c1cc1552 CM |
203 | } |
204 | ||
da141706 LA |
205 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
206 | unsigned long phys) | |
207 | { | |
208 | if (PAGE_SHIFT != 12) | |
209 | return false; | |
210 | ||
211 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
212 | return false; | |
213 | ||
214 | return true; | |
215 | } | |
216 | ||
11509a30 | 217 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 218 | phys_addr_t phys, pgprot_t prot, |
53e1b329 | 219 | phys_addr_t (*pgtable_alloc)(void), |
f14c66ce | 220 | bool page_mappings_only) |
c1cc1552 | 221 | { |
c79b954b | 222 | pud_t *pud; |
c1cc1552 CM |
223 | unsigned long next; |
224 | ||
c79b954b | 225 | if (pgd_none(*pgd)) { |
132233a7 LA |
226 | phys_addr_t pud_phys; |
227 | BUG_ON(!pgtable_alloc); | |
228 | pud_phys = pgtable_alloc(); | |
f4710445 | 229 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
230 | } |
231 | BUG_ON(pgd_bad(*pgd)); | |
232 | ||
f4710445 | 233 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 | 234 | do { |
e98216b5 AB |
235 | pud_t old_pud = *pud; |
236 | ||
c1cc1552 | 237 | next = pud_addr_end(addr, end); |
206a2a73 SC |
238 | |
239 | /* | |
240 | * For 4K granule only, attempt to put down a 1GB block | |
241 | */ | |
f14c66ce | 242 | if (use_1G_block(addr, next, phys) && !page_mappings_only) { |
c661cb1c | 243 | pud_set_huge(pud, phys, prot); |
206a2a73 SC |
244 | |
245 | /* | |
e98216b5 AB |
246 | * After the PUD entry has been populated once, we |
247 | * only allow updates to the permission attributes. | |
206a2a73 | 248 | */ |
e98216b5 AB |
249 | BUG_ON(!pgattr_change_is_safe(pud_val(old_pud), |
250 | pud_val(*pud))); | |
206a2a73 | 251 | } else { |
11509a30 | 252 | alloc_init_pmd(pud, addr, next, phys, prot, |
f14c66ce | 253 | pgtable_alloc, page_mappings_only); |
e98216b5 AB |
254 | |
255 | BUG_ON(pud_val(old_pud) != 0 && | |
256 | pud_val(old_pud) != pud_val(*pud)); | |
206a2a73 | 257 | } |
c1cc1552 CM |
258 | phys += next - addr; |
259 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
260 | |
261 | pud_clear_fixmap(); | |
c1cc1552 CM |
262 | } |
263 | ||
40f87d31 AB |
264 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
265 | unsigned long virt, phys_addr_t size, | |
266 | pgprot_t prot, | |
267 | phys_addr_t (*pgtable_alloc)(void), | |
f14c66ce | 268 | bool page_mappings_only) |
c1cc1552 CM |
269 | { |
270 | unsigned long addr, length, end, next; | |
40f87d31 | 271 | pgd_t *pgd = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 272 | |
cc5d2b3b MR |
273 | /* |
274 | * If the virtual and physical address don't have the same offset | |
275 | * within a page, we cannot map the region as the caller expects. | |
276 | */ | |
277 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
278 | return; | |
279 | ||
9c4e08a3 | 280 | phys &= PAGE_MASK; |
c1cc1552 CM |
281 | addr = virt & PAGE_MASK; |
282 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
283 | ||
c1cc1552 CM |
284 | end = addr + length; |
285 | do { | |
286 | next = pgd_addr_end(addr, end); | |
53e1b329 | 287 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc, |
f14c66ce | 288 | page_mappings_only); |
c1cc1552 CM |
289 | phys += next - addr; |
290 | } while (pgd++, addr = next, addr != end); | |
291 | } | |
292 | ||
1378dc3d | 293 | static phys_addr_t pgd_pgtable_alloc(void) |
da141706 | 294 | { |
21ab99c2 | 295 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
1378dc3d AB |
296 | if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) |
297 | BUG(); | |
21ab99c2 MR |
298 | |
299 | /* Ensure the zeroed page is visible to the page table walker */ | |
300 | dsb(ishst); | |
f4710445 | 301 | return __pa(ptr); |
da141706 LA |
302 | } |
303 | ||
132233a7 LA |
304 | /* |
305 | * This function can only be used to modify existing table entries, | |
306 | * without allocating new levels of table. Note that this permits the | |
307 | * creation of new section or page entries. | |
308 | */ | |
309 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 310 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
311 | { |
312 | if (virt < VMALLOC_START) { | |
313 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
314 | &phys, virt); | |
315 | return; | |
316 | } | |
f14c66ce | 317 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, false); |
d7ecbddf MS |
318 | } |
319 | ||
8ce837ce AB |
320 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
321 | unsigned long virt, phys_addr_t size, | |
f14c66ce | 322 | pgprot_t prot, bool page_mappings_only) |
8ce837ce | 323 | { |
1378dc3d AB |
324 | BUG_ON(mm == &init_mm); |
325 | ||
11509a30 | 326 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
f14c66ce | 327 | pgd_pgtable_alloc, page_mappings_only); |
d7ecbddf MS |
328 | } |
329 | ||
aa8c09be AB |
330 | static void update_mapping_prot(phys_addr_t phys, unsigned long virt, |
331 | phys_addr_t size, pgprot_t prot) | |
da141706 LA |
332 | { |
333 | if (virt < VMALLOC_START) { | |
aa8c09be | 334 | pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n", |
da141706 LA |
335 | &phys, virt); |
336 | return; | |
337 | } | |
338 | ||
eccc1bff | 339 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, false); |
aa8c09be AB |
340 | |
341 | /* flush the TLBs after updating live kernel mappings */ | |
342 | flush_tlb_kernel_range(virt, virt + size); | |
da141706 LA |
343 | } |
344 | ||
068a17a5 | 345 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 346 | { |
eac8017f MC |
347 | phys_addr_t kernel_start = __pa_symbol(_text); |
348 | phys_addr_t kernel_end = __pa_symbol(__init_begin); | |
068a17a5 | 349 | |
da141706 | 350 | /* |
f9040773 AB |
351 | * Take care not to create a writable alias for the |
352 | * read-only text and rodata sections of the kernel image. | |
da141706 | 353 | */ |
068a17a5 | 354 | |
9fdc14c5 | 355 | /* No overlap with the kernel text/rodata */ |
068a17a5 MR |
356 | if (end < kernel_start || start >= kernel_end) { |
357 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
358 | end - start, PAGE_KERNEL, | |
53e1b329 | 359 | early_pgtable_alloc, |
f14c66ce | 360 | debug_pagealloc_enabled()); |
068a17a5 | 361 | return; |
da141706 LA |
362 | } |
363 | ||
068a17a5 | 364 | /* |
9fdc14c5 | 365 | * This block overlaps the kernel text/rodata mappings. |
f9040773 | 366 | * Map the portion(s) which don't overlap. |
068a17a5 MR |
367 | */ |
368 | if (start < kernel_start) | |
369 | __create_pgd_mapping(pgd, start, | |
370 | __phys_to_virt(start), | |
371 | kernel_start - start, PAGE_KERNEL, | |
53e1b329 | 372 | early_pgtable_alloc, |
f14c66ce | 373 | debug_pagealloc_enabled()); |
068a17a5 MR |
374 | if (kernel_end < end) |
375 | __create_pgd_mapping(pgd, kernel_end, | |
376 | __phys_to_virt(kernel_end), | |
377 | end - kernel_end, PAGE_KERNEL, | |
53e1b329 | 378 | early_pgtable_alloc, |
f14c66ce | 379 | debug_pagealloc_enabled()); |
f9040773 AB |
380 | |
381 | /* | |
5ea5306c AB |
382 | * Map the linear alias of the [_text, __init_begin) interval |
383 | * as non-executable now, and remove the write permission in | |
384 | * mark_linear_text_alias_ro() below (which will be called after | |
385 | * alternative patching has completed). This makes the contents | |
386 | * of the region accessible to subsystems such as hibernate, | |
387 | * but protects it from inadvertent modification or execution. | |
f9040773 AB |
388 | */ |
389 | __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start), | |
5ea5306c | 390 | kernel_end - kernel_start, PAGE_KERNEL, |
eccc1bff | 391 | early_pgtable_alloc, false); |
da141706 | 392 | } |
da141706 | 393 | |
5ea5306c AB |
394 | void __init mark_linear_text_alias_ro(void) |
395 | { | |
396 | /* | |
397 | * Remove the write permissions from the linear alias of .text/.rodata | |
398 | */ | |
399 | update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text), | |
400 | (unsigned long)__init_begin - (unsigned long)_text, | |
401 | PAGE_KERNEL_RO); | |
402 | } | |
403 | ||
068a17a5 | 404 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
405 | { |
406 | struct memblock_region *reg; | |
f6bc87c3 | 407 | |
c1cc1552 CM |
408 | /* map all the memory banks */ |
409 | for_each_memblock(memory, reg) { | |
410 | phys_addr_t start = reg->base; | |
411 | phys_addr_t end = start + reg->size; | |
412 | ||
413 | if (start >= end) | |
414 | break; | |
68709f45 AB |
415 | if (memblock_is_nomap(reg)) |
416 | continue; | |
c1cc1552 | 417 | |
068a17a5 | 418 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
419 | } |
420 | } | |
421 | ||
da141706 LA |
422 | void mark_rodata_ro(void) |
423 | { | |
2f39b5f9 | 424 | unsigned long section_size; |
f9040773 | 425 | |
2f39b5f9 | 426 | /* |
9fdc14c5 AB |
427 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
428 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 429 | */ |
9fdc14c5 | 430 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
aa8c09be | 431 | update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata, |
2f39b5f9 | 432 | section_size, PAGE_KERNEL_RO); |
e98216b5 | 433 | |
1404d6f1 | 434 | debug_checkwx(); |
da141706 | 435 | } |
da141706 | 436 | |
2c09ec06 AB |
437 | static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end, |
438 | pgprot_t prot, struct vm_struct *vma) | |
068a17a5 | 439 | { |
2077be67 | 440 | phys_addr_t pa_start = __pa_symbol(va_start); |
068a17a5 MR |
441 | unsigned long size = va_end - va_start; |
442 | ||
443 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
444 | BUG_ON(!PAGE_ALIGNED(size)); | |
445 | ||
446 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
eccc1bff | 447 | early_pgtable_alloc, false); |
f9040773 AB |
448 | |
449 | vma->addr = va_start; | |
450 | vma->phys_addr = pa_start; | |
451 | vma->size = size; | |
452 | vma->flags = VM_MAP; | |
453 | vma->caller = __builtin_return_address(0); | |
454 | ||
455 | vm_area_add_early(vma); | |
068a17a5 MR |
456 | } |
457 | ||
28b066da AB |
458 | static int __init parse_rodata(char *arg) |
459 | { | |
460 | return strtobool(arg, &rodata_enabled); | |
461 | } | |
462 | early_param("rodata", parse_rodata); | |
463 | ||
068a17a5 MR |
464 | /* |
465 | * Create fine-grained mappings for the kernel. | |
466 | */ | |
467 | static void __init map_kernel(pgd_t *pgd) | |
468 | { | |
2ebe088b AB |
469 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext, |
470 | vmlinux_initdata, vmlinux_data; | |
068a17a5 | 471 | |
28b066da AB |
472 | /* |
473 | * External debuggers may need to write directly to the text | |
474 | * mapping to install SW breakpoints. Allow this (only) when | |
475 | * explicitly requested with rodata=off. | |
476 | */ | |
477 | pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC; | |
478 | ||
479 | map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text); | |
2ebe088b AB |
480 | map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL, |
481 | &vmlinux_rodata); | |
482 | map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot, | |
483 | &vmlinux_inittext); | |
484 | map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL, | |
485 | &vmlinux_initdata); | |
2c09ec06 | 486 | map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data); |
068a17a5 | 487 | |
f9040773 AB |
488 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
489 | /* | |
490 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
491 | * live in the carveout for the swapper_pg_dir. We can simply | |
492 | * re-use the existing dir for the fixmap. | |
493 | */ | |
494 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
495 | *pgd_offset_k(FIXADDR_START)); | |
496 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
497 | /* | |
498 | * The fixmap shares its top level pgd entry with the kernel | |
499 | * mapping. This can really only occur when we are running | |
500 | * with 16k/4 levels, so we can simply reuse the pud level | |
501 | * entry instead. | |
502 | */ | |
503 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
504 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
2077be67 | 505 | __pud(__pa_symbol(bm_pmd) | PUD_TYPE_TABLE)); |
f9040773 AB |
506 | pud_clear_fixmap(); |
507 | } else { | |
508 | BUG(); | |
509 | } | |
068a17a5 MR |
510 | |
511 | kasan_copy_shadow(pgd); | |
512 | } | |
513 | ||
c1cc1552 CM |
514 | /* |
515 | * paging_init() sets up the page tables, initialises the zone memory | |
516 | * maps and sets up the zero page. | |
517 | */ | |
518 | void __init paging_init(void) | |
519 | { | |
068a17a5 MR |
520 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
521 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
522 | ||
523 | map_kernel(pgd); | |
524 | map_mem(pgd); | |
525 | ||
526 | /* | |
527 | * We want to reuse the original swapper_pg_dir so we don't have to | |
528 | * communicate the new address to non-coherent secondaries in | |
529 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
530 | * adrp+add rather than a load from some global variable. | |
531 | * | |
532 | * To do this we need to go via a temporary pgd. | |
533 | */ | |
534 | cpu_replace_ttbr1(__va(pgd_phys)); | |
12f043ff | 535 | memcpy(swapper_pg_dir, pgd, PGD_SIZE); |
2077be67 | 536 | cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); |
068a17a5 MR |
537 | |
538 | pgd_clear_fixmap(); | |
539 | memblock_free(pgd_phys, PAGE_SIZE); | |
540 | ||
541 | /* | |
542 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
543 | * allocated with it. | |
544 | */ | |
2077be67 | 545 | memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE, |
068a17a5 | 546 | SWAPPER_DIR_SIZE - PAGE_SIZE); |
c1cc1552 CM |
547 | } |
548 | ||
c1cc1552 CM |
549 | /* |
550 | * Check whether a kernel address is valid (derived from arch/x86/). | |
551 | */ | |
552 | int kern_addr_valid(unsigned long addr) | |
553 | { | |
554 | pgd_t *pgd; | |
555 | pud_t *pud; | |
556 | pmd_t *pmd; | |
557 | pte_t *pte; | |
558 | ||
559 | if ((((long)addr) >> VA_BITS) != -1UL) | |
560 | return 0; | |
561 | ||
562 | pgd = pgd_offset_k(addr); | |
563 | if (pgd_none(*pgd)) | |
564 | return 0; | |
565 | ||
566 | pud = pud_offset(pgd, addr); | |
567 | if (pud_none(*pud)) | |
568 | return 0; | |
569 | ||
206a2a73 SC |
570 | if (pud_sect(*pud)) |
571 | return pfn_valid(pud_pfn(*pud)); | |
572 | ||
c1cc1552 CM |
573 | pmd = pmd_offset(pud, addr); |
574 | if (pmd_none(*pmd)) | |
575 | return 0; | |
576 | ||
da6e4cb6 DA |
577 | if (pmd_sect(*pmd)) |
578 | return pfn_valid(pmd_pfn(*pmd)); | |
579 | ||
c1cc1552 CM |
580 | pte = pte_offset_kernel(pmd, addr); |
581 | if (pte_none(*pte)) | |
582 | return 0; | |
583 | ||
584 | return pfn_valid(pte_pfn(*pte)); | |
585 | } | |
586 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 587 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 588 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 589 | { |
0aad818b | 590 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 591 | } |
b433dce0 | 592 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 593 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 594 | { |
0aad818b | 595 | unsigned long addr = start; |
c1cc1552 CM |
596 | unsigned long next; |
597 | pgd_t *pgd; | |
598 | pud_t *pud; | |
599 | pmd_t *pmd; | |
600 | ||
601 | do { | |
602 | next = pmd_addr_end(addr, end); | |
603 | ||
604 | pgd = vmemmap_pgd_populate(addr, node); | |
605 | if (!pgd) | |
606 | return -ENOMEM; | |
607 | ||
608 | pud = vmemmap_pud_populate(pgd, addr, node); | |
609 | if (!pud) | |
610 | return -ENOMEM; | |
611 | ||
612 | pmd = pmd_offset(pud, addr); | |
613 | if (pmd_none(*pmd)) { | |
614 | void *p = NULL; | |
615 | ||
616 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
617 | if (!p) | |
618 | return -ENOMEM; | |
619 | ||
a501e324 | 620 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
621 | } else |
622 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
623 | } while (addr = next, addr != end); | |
624 | ||
625 | return 0; | |
626 | } | |
627 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 628 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
629 | { |
630 | } | |
c1cc1552 | 631 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 632 | |
af86e597 LA |
633 | static inline pud_t * fixmap_pud(unsigned long addr) |
634 | { | |
635 | pgd_t *pgd = pgd_offset_k(addr); | |
636 | ||
637 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
638 | ||
157962f5 | 639 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
640 | } |
641 | ||
642 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
643 | { | |
644 | pud_t *pud = fixmap_pud(addr); | |
645 | ||
646 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
647 | ||
157962f5 | 648 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
649 | } |
650 | ||
651 | static inline pte_t * fixmap_pte(unsigned long addr) | |
652 | { | |
157962f5 | 653 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
654 | } |
655 | ||
2077be67 LA |
656 | /* |
657 | * The p*d_populate functions call virt_to_phys implicitly so they can't be used | |
658 | * directly on kernel symbols (bm_p*d). This function is called too early to use | |
659 | * lm_alias so __p*d_populate functions must be used to populate with the | |
660 | * physical address from __pa_symbol. | |
661 | */ | |
af86e597 LA |
662 | void __init early_fixmap_init(void) |
663 | { | |
664 | pgd_t *pgd; | |
665 | pud_t *pud; | |
666 | pmd_t *pmd; | |
667 | unsigned long addr = FIXADDR_START; | |
668 | ||
669 | pgd = pgd_offset_k(addr); | |
f80fb3a3 | 670 | if (CONFIG_PGTABLE_LEVELS > 3 && |
2077be67 | 671 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) { |
f9040773 AB |
672 | /* |
673 | * We only end up here if the kernel mapping and the fixmap | |
674 | * share the top level pgd entry, which should only happen on | |
675 | * 16k/4 levels configurations. | |
676 | */ | |
677 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
678 | pud = pud_offset_kimg(pgd, addr); | |
679 | } else { | |
2077be67 LA |
680 | if (pgd_none(*pgd)) |
681 | __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE); | |
f9040773 AB |
682 | pud = fixmap_pud(addr); |
683 | } | |
2077be67 LA |
684 | if (pud_none(*pud)) |
685 | __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE); | |
157962f5 | 686 | pmd = fixmap_pmd(addr); |
2077be67 | 687 | __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE); |
af86e597 LA |
688 | |
689 | /* | |
690 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 691 | * we are not prepared: |
af86e597 LA |
692 | */ |
693 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
694 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
695 | ||
696 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
697 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
698 | WARN_ON(1); | |
699 | pr_warn("pmd %p != %p, %p\n", | |
700 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
701 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
702 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
703 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
704 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
705 | fix_to_virt(FIX_BTMAP_END)); | |
706 | ||
707 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
708 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
709 | } | |
710 | } | |
711 | ||
712 | void __set_fixmap(enum fixed_addresses idx, | |
713 | phys_addr_t phys, pgprot_t flags) | |
714 | { | |
715 | unsigned long addr = __fix_to_virt(idx); | |
716 | pte_t *pte; | |
717 | ||
b63dbef9 | 718 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
719 | |
720 | pte = fixmap_pte(addr); | |
721 | ||
722 | if (pgprot_val(flags)) { | |
723 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
724 | } else { | |
725 | pte_clear(&init_mm, addr, pte); | |
726 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
727 | } | |
728 | } | |
61bd93ce | 729 | |
f80fb3a3 | 730 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
731 | { |
732 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 733 | int offset; |
61bd93ce AB |
734 | void *dt_virt; |
735 | ||
736 | /* | |
737 | * Check whether the physical FDT address is set and meets the minimum | |
738 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
739 | * at least 8 bytes so that we can always access the magic and size |
740 | * fields of the FDT header after mapping the first chunk, double check | |
741 | * here if that is indeed the case. | |
61bd93ce AB |
742 | */ |
743 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
744 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
745 | return NULL; | |
746 | ||
747 | /* | |
748 | * Make sure that the FDT region can be mapped without the need to | |
749 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 750 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
751 | * |
752 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
753 | * be in the same PMD as the rest of the fixmap. | |
754 | * On 4k pages, we'll use section mappings for the FDT so we only | |
755 | * have to be in the same PUD. | |
756 | */ | |
757 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
758 | ||
b433dce0 SP |
759 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
760 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 761 | |
b433dce0 | 762 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
763 | dt_virt = (void *)dt_virt_base + offset; |
764 | ||
765 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
766 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
767 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 768 | |
04a84810 | 769 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
770 | return NULL; |
771 | ||
f80fb3a3 AB |
772 | *size = fdt_totalsize(dt_virt); |
773 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
774 | return NULL; |
775 | ||
f80fb3a3 | 776 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 777 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 778 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 779 | |
f80fb3a3 AB |
780 | return dt_virt; |
781 | } | |
61bd93ce | 782 | |
f80fb3a3 AB |
783 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
784 | { | |
785 | void *dt_virt; | |
786 | int size; | |
787 | ||
788 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
789 | if (!dt_virt) | |
790 | return NULL; | |
791 | ||
792 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
793 | return dt_virt; |
794 | } | |
324420bf AB |
795 | |
796 | int __init arch_ioremap_pud_supported(void) | |
797 | { | |
798 | /* only 4k granule supports level 1 block mappings */ | |
799 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
800 | } | |
801 | ||
802 | int __init arch_ioremap_pmd_supported(void) | |
803 | { | |
804 | return 1; | |
805 | } | |
806 | ||
807 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
808 | { | |
809 | BUG_ON(phys & ~PUD_MASK); | |
810 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
811 | return 1; | |
812 | } | |
813 | ||
814 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
815 | { | |
816 | BUG_ON(phys & ~PMD_MASK); | |
817 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
818 | return 1; | |
819 | } | |
820 | ||
821 | int pud_clear_huge(pud_t *pud) | |
822 | { | |
823 | if (!pud_sect(*pud)) | |
824 | return 0; | |
825 | pud_clear(pud); | |
826 | return 1; | |
827 | } | |
828 | ||
829 | int pmd_clear_huge(pmd_t *pmd) | |
830 | { | |
831 | if (!pmd_sect(*pmd)) | |
832 | return 0; | |
833 | pmd_clear(pmd); | |
834 | return 1; | |
835 | } |