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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 | ||
20 | #include <linux/export.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/init.h> | |
61bd93ce | 24 | #include <linux/libfdt.h> |
c1cc1552 CM |
25 | #include <linux/mman.h> |
26 | #include <linux/nodemask.h> | |
27 | #include <linux/memblock.h> | |
28 | #include <linux/fs.h> | |
2475ff9d | 29 | #include <linux/io.h> |
41089357 | 30 | #include <linux/slab.h> |
da141706 | 31 | #include <linux/stop_machine.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 CM |
43 | #include <asm/mmu_context.h> |
44 | ||
45 | #include "mm.h" | |
46 | ||
dd006da2 AB |
47 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
48 | ||
a7f8de16 AB |
49 | u64 kimage_voffset __read_mostly; |
50 | EXPORT_SYMBOL(kimage_voffset); | |
51 | ||
c1cc1552 CM |
52 | /* |
53 | * Empty_zero_page is a special page that is used for zero-initialized data | |
54 | * and COW. | |
55 | */ | |
5227cfa7 | 56 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
57 | EXPORT_SYMBOL(empty_zero_page); |
58 | ||
f9040773 AB |
59 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
60 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
61 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
62 | ||
c1cc1552 CM |
63 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
64 | unsigned long size, pgprot_t vma_prot) | |
65 | { | |
66 | if (!pfn_valid(pfn)) | |
67 | return pgprot_noncached(vma_prot); | |
68 | else if (file->f_flags & O_SYNC) | |
69 | return pgprot_writecombine(vma_prot); | |
70 | return vma_prot; | |
71 | } | |
72 | EXPORT_SYMBOL(phys_mem_access_prot); | |
73 | ||
f4710445 | 74 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 75 | { |
7142392d SP |
76 | phys_addr_t phys; |
77 | void *ptr; | |
78 | ||
21ab99c2 | 79 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
7142392d | 80 | BUG_ON(!phys); |
f4710445 MR |
81 | |
82 | /* | |
83 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
84 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
85 | * any level of table. | |
86 | */ | |
87 | ptr = pte_set_fixmap(phys); | |
88 | ||
21ab99c2 MR |
89 | memset(ptr, 0, PAGE_SIZE); |
90 | ||
f4710445 MR |
91 | /* |
92 | * Implicit barriers also ensure the zeroed page is visible to the page | |
93 | * table walker | |
94 | */ | |
95 | pte_clear_fixmap(); | |
96 | ||
97 | return phys; | |
c1cc1552 CM |
98 | } |
99 | ||
da141706 LA |
100 | /* |
101 | * remap a PMD into pages | |
102 | */ | |
103 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
104 | { | |
105 | unsigned long pfn = pmd_pfn(*pmd); | |
106 | int i = 0; | |
107 | ||
108 | do { | |
109 | /* | |
110 | * Need to have the least restrictive permissions available | |
667c2759 | 111 | * permissions will be fixed up later |
da141706 | 112 | */ |
667c2759 | 113 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
da141706 LA |
114 | pfn++; |
115 | } while (pte++, i++, i < PTRS_PER_PTE); | |
116 | } | |
117 | ||
118 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
667c2759 | 119 | unsigned long end, unsigned long pfn, |
da141706 | 120 | pgprot_t prot, |
f4710445 | 121 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
122 | { |
123 | pte_t *pte; | |
124 | ||
a1c76574 | 125 | if (pmd_none(*pmd) || pmd_sect(*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); |
da141706 LA |
130 | if (pmd_sect(*pmd)) |
131 | split_pmd(pmd, pte); | |
f4710445 | 132 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
da141706 | 133 | flush_tlb_all(); |
f4710445 | 134 | pte_clear_fixmap(); |
c1cc1552 | 135 | } |
a1c76574 | 136 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 137 | |
f4710445 | 138 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 139 | do { |
667c2759 CM |
140 | set_pte(pte, pfn_pte(pfn, prot)); |
141 | pfn++; | |
142 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
f4710445 MR |
143 | |
144 | pte_clear_fixmap(); | |
c1cc1552 CM |
145 | } |
146 | ||
9a17a213 | 147 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
da141706 LA |
148 | { |
149 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
150 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
151 | int i = 0; | |
152 | ||
153 | do { | |
1e43ba9c | 154 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
da141706 LA |
155 | addr += PMD_SIZE; |
156 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
157 | } | |
158 | ||
83863f25 LA |
159 | #ifdef CONFIG_DEBUG_PAGEALLOC |
160 | static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void)) | |
161 | { | |
162 | ||
163 | /* | |
164 | * If debug_page_alloc is enabled we must map the linear map | |
165 | * using pages. However, other mappings created by | |
166 | * create_mapping_noalloc must use sections in some cases. Allow | |
167 | * sections to be used in those cases, where no pgtable_alloc | |
168 | * function is provided. | |
169 | */ | |
170 | return !pgtable_alloc || !debug_pagealloc_enabled(); | |
171 | } | |
172 | #else | |
173 | static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc)(void)) | |
174 | { | |
175 | return true; | |
176 | } | |
177 | #endif | |
178 | ||
11509a30 | 179 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 180 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 181 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
182 | { |
183 | pmd_t *pmd; | |
184 | unsigned long next; | |
185 | ||
186 | /* | |
187 | * Check for initial section mappings in the pgd/pud and remove them. | |
188 | */ | |
a1c76574 | 189 | if (pud_none(*pud) || pud_sect(*pud)) { |
132233a7 LA |
190 | phys_addr_t pmd_phys; |
191 | BUG_ON(!pgtable_alloc); | |
192 | pmd_phys = pgtable_alloc(); | |
f4710445 | 193 | pmd = pmd_set_fixmap(pmd_phys); |
da141706 LA |
194 | if (pud_sect(*pud)) { |
195 | /* | |
196 | * need to have the 1G of mappings continue to be | |
197 | * present | |
198 | */ | |
199 | split_pud(pud, pmd); | |
200 | } | |
f4710445 | 201 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
da141706 | 202 | flush_tlb_all(); |
f4710445 | 203 | pmd_clear_fixmap(); |
c1cc1552 | 204 | } |
a1c76574 | 205 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 206 | |
f4710445 | 207 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 CM |
208 | do { |
209 | next = pmd_addr_end(addr, end); | |
210 | /* try section mapping first */ | |
83863f25 LA |
211 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
212 | block_mappings_allowed(pgtable_alloc)) { | |
a55f9929 | 213 | pmd_t old_pmd =*pmd; |
8ce837ce AB |
214 | set_pmd(pmd, __pmd(phys | |
215 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
216 | /* |
217 | * Check for previous table entries created during | |
218 | * boot (__create_page_tables) and flush them. | |
219 | */ | |
523d6e9f | 220 | if (!pmd_none(old_pmd)) { |
a55f9929 | 221 | flush_tlb_all(); |
523d6e9f | 222 | if (pmd_table(old_pmd)) { |
316b39db | 223 | phys_addr_t table = pmd_page_paddr(old_pmd); |
41089357 CM |
224 | if (!WARN_ON_ONCE(slab_is_available())) |
225 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 226 | } |
227 | } | |
a55f9929 | 228 | } else { |
667c2759 | 229 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
21ab99c2 | 230 | prot, pgtable_alloc); |
a55f9929 | 231 | } |
c1cc1552 CM |
232 | phys += next - addr; |
233 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
234 | |
235 | pmd_clear_fixmap(); | |
c1cc1552 CM |
236 | } |
237 | ||
da141706 LA |
238 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
239 | unsigned long phys) | |
240 | { | |
241 | if (PAGE_SHIFT != 12) | |
242 | return false; | |
243 | ||
244 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
245 | return false; | |
246 | ||
247 | return true; | |
248 | } | |
249 | ||
11509a30 | 250 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 251 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 252 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 | 253 | { |
c79b954b | 254 | pud_t *pud; |
c1cc1552 CM |
255 | unsigned long next; |
256 | ||
c79b954b | 257 | if (pgd_none(*pgd)) { |
132233a7 LA |
258 | phys_addr_t pud_phys; |
259 | BUG_ON(!pgtable_alloc); | |
260 | pud_phys = pgtable_alloc(); | |
f4710445 | 261 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
262 | } |
263 | BUG_ON(pgd_bad(*pgd)); | |
264 | ||
f4710445 | 265 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 CM |
266 | do { |
267 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
268 | |
269 | /* | |
270 | * For 4K granule only, attempt to put down a 1GB block | |
271 | */ | |
83863f25 LA |
272 | if (use_1G_block(addr, next, phys) && |
273 | block_mappings_allowed(pgtable_alloc)) { | |
206a2a73 | 274 | pud_t old_pud = *pud; |
8ce837ce AB |
275 | set_pud(pud, __pud(phys | |
276 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
277 | |
278 | /* | |
279 | * If we have an old value for a pud, it will | |
280 | * be pointing to a pmd table that we no longer | |
281 | * need (from swapper_pg_dir). | |
282 | * | |
283 | * Look up the old pmd table and free it. | |
284 | */ | |
285 | if (!pud_none(old_pud)) { | |
206a2a73 | 286 | flush_tlb_all(); |
523d6e9f | 287 | if (pud_table(old_pud)) { |
316b39db | 288 | phys_addr_t table = pud_page_paddr(old_pud); |
41089357 CM |
289 | if (!WARN_ON_ONCE(slab_is_available())) |
290 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 291 | } |
206a2a73 SC |
292 | } |
293 | } else { | |
11509a30 | 294 | alloc_init_pmd(pud, addr, next, phys, prot, |
21ab99c2 | 295 | pgtable_alloc); |
206a2a73 | 296 | } |
c1cc1552 CM |
297 | phys += next - addr; |
298 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
299 | |
300 | pud_clear_fixmap(); | |
c1cc1552 CM |
301 | } |
302 | ||
303 | /* | |
304 | * Create the page directory entries and any necessary page tables for the | |
305 | * mapping specified by 'md'. | |
306 | */ | |
11509a30 | 307 | static void init_pgd(pgd_t *pgd, phys_addr_t phys, unsigned long virt, |
da141706 | 308 | phys_addr_t size, pgprot_t prot, |
f4710445 | 309 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
310 | { |
311 | unsigned long addr, length, end, next; | |
c1cc1552 | 312 | |
cc5d2b3b MR |
313 | /* |
314 | * If the virtual and physical address don't have the same offset | |
315 | * within a page, we cannot map the region as the caller expects. | |
316 | */ | |
317 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
318 | return; | |
319 | ||
9c4e08a3 | 320 | phys &= PAGE_MASK; |
c1cc1552 CM |
321 | addr = virt & PAGE_MASK; |
322 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
323 | ||
c1cc1552 CM |
324 | end = addr + length; |
325 | do { | |
326 | next = pgd_addr_end(addr, end); | |
11509a30 | 327 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc); |
c1cc1552 CM |
328 | phys += next - addr; |
329 | } while (pgd++, addr = next, addr != end); | |
330 | } | |
331 | ||
f4710445 | 332 | static phys_addr_t late_pgtable_alloc(void) |
da141706 | 333 | { |
21ab99c2 | 334 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
da141706 | 335 | BUG_ON(!ptr); |
21ab99c2 MR |
336 | |
337 | /* Ensure the zeroed page is visible to the page table walker */ | |
338 | dsb(ishst); | |
f4710445 | 339 | return __pa(ptr); |
da141706 LA |
340 | } |
341 | ||
11509a30 MR |
342 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
343 | unsigned long virt, phys_addr_t size, | |
344 | pgprot_t prot, | |
345 | phys_addr_t (*alloc)(void)) | |
346 | { | |
347 | init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc); | |
348 | } | |
349 | ||
132233a7 LA |
350 | /* |
351 | * This function can only be used to modify existing table entries, | |
352 | * without allocating new levels of table. Note that this permits the | |
353 | * creation of new section or page entries. | |
354 | */ | |
355 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 356 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
357 | { |
358 | if (virt < VMALLOC_START) { | |
359 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
360 | &phys, virt); | |
361 | return; | |
362 | } | |
11509a30 | 363 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
132233a7 | 364 | NULL); |
d7ecbddf MS |
365 | } |
366 | ||
8ce837ce AB |
367 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
368 | unsigned long virt, phys_addr_t size, | |
369 | pgprot_t prot) | |
370 | { | |
11509a30 MR |
371 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
372 | late_pgtable_alloc); | |
d7ecbddf MS |
373 | } |
374 | ||
da141706 LA |
375 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
376 | phys_addr_t size, pgprot_t prot) | |
377 | { | |
378 | if (virt < VMALLOC_START) { | |
379 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
380 | &phys, virt); | |
381 | return; | |
382 | } | |
383 | ||
11509a30 MR |
384 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
385 | late_pgtable_alloc); | |
da141706 LA |
386 | } |
387 | ||
068a17a5 | 388 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 389 | { |
068a17a5 | 390 | unsigned long kernel_start = __pa(_stext); |
f9040773 | 391 | unsigned long kernel_end = __pa(_etext); |
068a17a5 | 392 | |
da141706 | 393 | /* |
f9040773 AB |
394 | * Take care not to create a writable alias for the |
395 | * read-only text and rodata sections of the kernel image. | |
da141706 | 396 | */ |
068a17a5 | 397 | |
f9040773 | 398 | /* No overlap with the kernel text */ |
068a17a5 MR |
399 | if (end < kernel_start || start >= kernel_end) { |
400 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
401 | end - start, PAGE_KERNEL, | |
402 | early_pgtable_alloc); | |
403 | return; | |
da141706 LA |
404 | } |
405 | ||
068a17a5 | 406 | /* |
f9040773 AB |
407 | * This block overlaps the kernel text mapping. |
408 | * Map the portion(s) which don't overlap. | |
068a17a5 MR |
409 | */ |
410 | if (start < kernel_start) | |
411 | __create_pgd_mapping(pgd, start, | |
412 | __phys_to_virt(start), | |
413 | kernel_start - start, PAGE_KERNEL, | |
414 | early_pgtable_alloc); | |
415 | if (kernel_end < end) | |
416 | __create_pgd_mapping(pgd, kernel_end, | |
417 | __phys_to_virt(kernel_end), | |
418 | end - kernel_end, PAGE_KERNEL, | |
419 | early_pgtable_alloc); | |
f9040773 AB |
420 | |
421 | /* | |
422 | * Map the linear alias of the [_stext, _etext) interval as | |
423 | * read-only/non-executable. This makes the contents of the | |
424 | * region accessible to subsystems such as hibernate, but | |
425 | * protects it from inadvertent modification or execution. | |
426 | */ | |
427 | __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start), | |
428 | kernel_end - kernel_start, PAGE_KERNEL_RO, | |
429 | early_pgtable_alloc); | |
da141706 | 430 | } |
da141706 | 431 | |
068a17a5 | 432 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
433 | { |
434 | struct memblock_region *reg; | |
f6bc87c3 | 435 | |
c1cc1552 CM |
436 | /* map all the memory banks */ |
437 | for_each_memblock(memory, reg) { | |
438 | phys_addr_t start = reg->base; | |
439 | phys_addr_t end = start + reg->size; | |
440 | ||
441 | if (start >= end) | |
442 | break; | |
68709f45 AB |
443 | if (memblock_is_nomap(reg)) |
444 | continue; | |
c1cc1552 | 445 | |
068a17a5 | 446 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
447 | } |
448 | } | |
449 | ||
da141706 LA |
450 | void mark_rodata_ro(void) |
451 | { | |
f9040773 AB |
452 | if (!IS_ENABLED(CONFIG_DEBUG_RODATA)) |
453 | return; | |
454 | ||
da141706 LA |
455 | create_mapping_late(__pa(_stext), (unsigned long)_stext, |
456 | (unsigned long)_etext - (unsigned long)_stext, | |
0b2aa5b8 | 457 | PAGE_KERNEL_ROX); |
da141706 | 458 | } |
da141706 LA |
459 | |
460 | void fixup_init(void) | |
461 | { | |
f9040773 AB |
462 | /* |
463 | * Unmap the __init region but leave the VM area in place. This | |
464 | * prevents the region from being reused for kernel modules, which | |
465 | * is not supported by kallsyms. | |
466 | */ | |
467 | unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin)); | |
da141706 LA |
468 | } |
469 | ||
068a17a5 | 470 | static void __init map_kernel_chunk(pgd_t *pgd, void *va_start, void *va_end, |
f9040773 | 471 | pgprot_t prot, struct vm_struct *vma) |
068a17a5 MR |
472 | { |
473 | phys_addr_t pa_start = __pa(va_start); | |
474 | unsigned long size = va_end - va_start; | |
475 | ||
476 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
477 | BUG_ON(!PAGE_ALIGNED(size)); | |
478 | ||
479 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
480 | early_pgtable_alloc); | |
f9040773 AB |
481 | |
482 | vma->addr = va_start; | |
483 | vma->phys_addr = pa_start; | |
484 | vma->size = size; | |
485 | vma->flags = VM_MAP; | |
486 | vma->caller = __builtin_return_address(0); | |
487 | ||
488 | vm_area_add_early(vma); | |
068a17a5 MR |
489 | } |
490 | ||
491 | /* | |
492 | * Create fine-grained mappings for the kernel. | |
493 | */ | |
494 | static void __init map_kernel(pgd_t *pgd) | |
495 | { | |
f9040773 | 496 | static struct vm_struct vmlinux_text, vmlinux_init, vmlinux_data; |
068a17a5 | 497 | |
f9040773 AB |
498 | map_kernel_chunk(pgd, _stext, _etext, PAGE_KERNEL_EXEC, &vmlinux_text); |
499 | map_kernel_chunk(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC, | |
500 | &vmlinux_init); | |
501 | map_kernel_chunk(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data); | |
068a17a5 | 502 | |
f9040773 AB |
503 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
504 | /* | |
505 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
506 | * live in the carveout for the swapper_pg_dir. We can simply | |
507 | * re-use the existing dir for the fixmap. | |
508 | */ | |
509 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
510 | *pgd_offset_k(FIXADDR_START)); | |
511 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
512 | /* | |
513 | * The fixmap shares its top level pgd entry with the kernel | |
514 | * mapping. This can really only occur when we are running | |
515 | * with 16k/4 levels, so we can simply reuse the pud level | |
516 | * entry instead. | |
517 | */ | |
518 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
519 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
520 | __pud(__pa(bm_pmd) | PUD_TYPE_TABLE)); | |
521 | pud_clear_fixmap(); | |
522 | } else { | |
523 | BUG(); | |
524 | } | |
068a17a5 MR |
525 | |
526 | kasan_copy_shadow(pgd); | |
527 | } | |
528 | ||
c1cc1552 CM |
529 | /* |
530 | * paging_init() sets up the page tables, initialises the zone memory | |
531 | * maps and sets up the zero page. | |
532 | */ | |
533 | void __init paging_init(void) | |
534 | { | |
068a17a5 MR |
535 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
536 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
537 | ||
538 | map_kernel(pgd); | |
539 | map_mem(pgd); | |
540 | ||
541 | /* | |
542 | * We want to reuse the original swapper_pg_dir so we don't have to | |
543 | * communicate the new address to non-coherent secondaries in | |
544 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
545 | * adrp+add rather than a load from some global variable. | |
546 | * | |
547 | * To do this we need to go via a temporary pgd. | |
548 | */ | |
549 | cpu_replace_ttbr1(__va(pgd_phys)); | |
550 | memcpy(swapper_pg_dir, pgd, PAGE_SIZE); | |
551 | cpu_replace_ttbr1(swapper_pg_dir); | |
552 | ||
553 | pgd_clear_fixmap(); | |
554 | memblock_free(pgd_phys, PAGE_SIZE); | |
555 | ||
556 | /* | |
557 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
558 | * allocated with it. | |
559 | */ | |
560 | memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE, | |
561 | SWAPPER_DIR_SIZE - PAGE_SIZE); | |
c1cc1552 | 562 | |
c1cc1552 | 563 | bootmem_init(); |
c1cc1552 CM |
564 | } |
565 | ||
c1cc1552 CM |
566 | /* |
567 | * Check whether a kernel address is valid (derived from arch/x86/). | |
568 | */ | |
569 | int kern_addr_valid(unsigned long addr) | |
570 | { | |
571 | pgd_t *pgd; | |
572 | pud_t *pud; | |
573 | pmd_t *pmd; | |
574 | pte_t *pte; | |
575 | ||
576 | if ((((long)addr) >> VA_BITS) != -1UL) | |
577 | return 0; | |
578 | ||
579 | pgd = pgd_offset_k(addr); | |
580 | if (pgd_none(*pgd)) | |
581 | return 0; | |
582 | ||
583 | pud = pud_offset(pgd, addr); | |
584 | if (pud_none(*pud)) | |
585 | return 0; | |
586 | ||
206a2a73 SC |
587 | if (pud_sect(*pud)) |
588 | return pfn_valid(pud_pfn(*pud)); | |
589 | ||
c1cc1552 CM |
590 | pmd = pmd_offset(pud, addr); |
591 | if (pmd_none(*pmd)) | |
592 | return 0; | |
593 | ||
da6e4cb6 DA |
594 | if (pmd_sect(*pmd)) |
595 | return pfn_valid(pmd_pfn(*pmd)); | |
596 | ||
c1cc1552 CM |
597 | pte = pte_offset_kernel(pmd, addr); |
598 | if (pte_none(*pte)) | |
599 | return 0; | |
600 | ||
601 | return pfn_valid(pte_pfn(*pte)); | |
602 | } | |
603 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 604 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 605 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 606 | { |
0aad818b | 607 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 608 | } |
b433dce0 | 609 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 610 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 611 | { |
0aad818b | 612 | unsigned long addr = start; |
c1cc1552 CM |
613 | unsigned long next; |
614 | pgd_t *pgd; | |
615 | pud_t *pud; | |
616 | pmd_t *pmd; | |
617 | ||
618 | do { | |
619 | next = pmd_addr_end(addr, end); | |
620 | ||
621 | pgd = vmemmap_pgd_populate(addr, node); | |
622 | if (!pgd) | |
623 | return -ENOMEM; | |
624 | ||
625 | pud = vmemmap_pud_populate(pgd, addr, node); | |
626 | if (!pud) | |
627 | return -ENOMEM; | |
628 | ||
629 | pmd = pmd_offset(pud, addr); | |
630 | if (pmd_none(*pmd)) { | |
631 | void *p = NULL; | |
632 | ||
633 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
634 | if (!p) | |
635 | return -ENOMEM; | |
636 | ||
a501e324 | 637 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
638 | } else |
639 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
640 | } while (addr = next, addr != end); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 645 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
646 | { |
647 | } | |
c1cc1552 | 648 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 649 | |
af86e597 LA |
650 | static inline pud_t * fixmap_pud(unsigned long addr) |
651 | { | |
652 | pgd_t *pgd = pgd_offset_k(addr); | |
653 | ||
654 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
655 | ||
157962f5 | 656 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
657 | } |
658 | ||
659 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
660 | { | |
661 | pud_t *pud = fixmap_pud(addr); | |
662 | ||
663 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
664 | ||
157962f5 | 665 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
666 | } |
667 | ||
668 | static inline pte_t * fixmap_pte(unsigned long addr) | |
669 | { | |
157962f5 | 670 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
671 | } |
672 | ||
673 | void __init early_fixmap_init(void) | |
674 | { | |
675 | pgd_t *pgd; | |
676 | pud_t *pud; | |
677 | pmd_t *pmd; | |
678 | unsigned long addr = FIXADDR_START; | |
679 | ||
680 | pgd = pgd_offset_k(addr); | |
f80fb3a3 AB |
681 | if (CONFIG_PGTABLE_LEVELS > 3 && |
682 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa(bm_pud))) { | |
f9040773 AB |
683 | /* |
684 | * We only end up here if the kernel mapping and the fixmap | |
685 | * share the top level pgd entry, which should only happen on | |
686 | * 16k/4 levels configurations. | |
687 | */ | |
688 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
689 | pud = pud_offset_kimg(pgd, addr); | |
690 | } else { | |
691 | pgd_populate(&init_mm, pgd, bm_pud); | |
692 | pud = fixmap_pud(addr); | |
693 | } | |
af86e597 | 694 | pud_populate(&init_mm, pud, bm_pmd); |
157962f5 | 695 | pmd = fixmap_pmd(addr); |
af86e597 LA |
696 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
697 | ||
698 | /* | |
699 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 700 | * we are not prepared: |
af86e597 LA |
701 | */ |
702 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
703 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
704 | ||
705 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
706 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
707 | WARN_ON(1); | |
708 | pr_warn("pmd %p != %p, %p\n", | |
709 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
710 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
711 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
712 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
713 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
714 | fix_to_virt(FIX_BTMAP_END)); | |
715 | ||
716 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
717 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
718 | } | |
719 | } | |
720 | ||
721 | void __set_fixmap(enum fixed_addresses idx, | |
722 | phys_addr_t phys, pgprot_t flags) | |
723 | { | |
724 | unsigned long addr = __fix_to_virt(idx); | |
725 | pte_t *pte; | |
726 | ||
b63dbef9 | 727 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
728 | |
729 | pte = fixmap_pte(addr); | |
730 | ||
731 | if (pgprot_val(flags)) { | |
732 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
733 | } else { | |
734 | pte_clear(&init_mm, addr, pte); | |
735 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
736 | } | |
737 | } | |
61bd93ce | 738 | |
f80fb3a3 | 739 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
740 | { |
741 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 742 | int offset; |
61bd93ce AB |
743 | void *dt_virt; |
744 | ||
745 | /* | |
746 | * Check whether the physical FDT address is set and meets the minimum | |
747 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
748 | * at least 8 bytes so that we can always access the size field of the | |
749 | * FDT header after mapping the first chunk, double check here if that | |
750 | * is indeed the case. | |
751 | */ | |
752 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
753 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
754 | return NULL; | |
755 | ||
756 | /* | |
757 | * Make sure that the FDT region can be mapped without the need to | |
758 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 759 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
760 | * |
761 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
762 | * be in the same PMD as the rest of the fixmap. | |
763 | * On 4k pages, we'll use section mappings for the FDT so we only | |
764 | * have to be in the same PUD. | |
765 | */ | |
766 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
767 | ||
b433dce0 SP |
768 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
769 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 770 | |
b433dce0 | 771 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
772 | dt_virt = (void *)dt_virt_base + offset; |
773 | ||
774 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
775 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
776 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce AB |
777 | |
778 | if (fdt_check_header(dt_virt) != 0) | |
779 | return NULL; | |
780 | ||
f80fb3a3 AB |
781 | *size = fdt_totalsize(dt_virt); |
782 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
783 | return NULL; |
784 | ||
f80fb3a3 | 785 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 786 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 787 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 788 | |
f80fb3a3 AB |
789 | return dt_virt; |
790 | } | |
61bd93ce | 791 | |
f80fb3a3 AB |
792 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
793 | { | |
794 | void *dt_virt; | |
795 | int size; | |
796 | ||
797 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
798 | if (!dt_virt) | |
799 | return NULL; | |
800 | ||
801 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
802 | return dt_virt; |
803 | } | |
324420bf AB |
804 | |
805 | int __init arch_ioremap_pud_supported(void) | |
806 | { | |
807 | /* only 4k granule supports level 1 block mappings */ | |
808 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
809 | } | |
810 | ||
811 | int __init arch_ioremap_pmd_supported(void) | |
812 | { | |
813 | return 1; | |
814 | } | |
815 | ||
816 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
817 | { | |
818 | BUG_ON(phys & ~PUD_MASK); | |
819 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
820 | return 1; | |
821 | } | |
822 | ||
823 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
824 | { | |
825 | BUG_ON(phys & ~PMD_MASK); | |
826 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
827 | return 1; | |
828 | } | |
829 | ||
830 | int pud_clear_huge(pud_t *pud) | |
831 | { | |
832 | if (!pud_sect(*pud)) | |
833 | return 0; | |
834 | pud_clear(pud); | |
835 | return 1; | |
836 | } | |
837 | ||
838 | int pmd_clear_huge(pmd_t *pmd) | |
839 | { | |
840 | if (!pmd_sect(*pmd)) | |
841 | return 0; | |
842 | pmd_clear(pmd); | |
843 | return 1; | |
844 | } |