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