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> |
c1cc1552 | 31 | |
21ab99c2 | 32 | #include <asm/barrier.h> |
c1cc1552 | 33 | #include <asm/cputype.h> |
af86e597 | 34 | #include <asm/fixmap.h> |
068a17a5 | 35 | #include <asm/kasan.h> |
b433dce0 | 36 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
37 | #include <asm/sections.h> |
38 | #include <asm/setup.h> | |
39 | #include <asm/sizes.h> | |
40 | #include <asm/tlb.h> | |
c79b954b | 41 | #include <asm/memblock.h> |
c1cc1552 | 42 | #include <asm/mmu_context.h> |
1404d6f1 | 43 | #include <asm/ptdump.h> |
c1cc1552 | 44 | |
dd006da2 AB |
45 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
46 | ||
5a9e3e15 | 47 | u64 kimage_voffset __ro_after_init; |
a7f8de16 AB |
48 | EXPORT_SYMBOL(kimage_voffset); |
49 | ||
c1cc1552 CM |
50 | /* |
51 | * Empty_zero_page is a special page that is used for zero-initialized data | |
52 | * and COW. | |
53 | */ | |
5227cfa7 | 54 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
55 | EXPORT_SYMBOL(empty_zero_page); |
56 | ||
f9040773 AB |
57 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
58 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
59 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
60 | ||
c1cc1552 CM |
61 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
62 | unsigned long size, pgprot_t vma_prot) | |
63 | { | |
64 | if (!pfn_valid(pfn)) | |
65 | return pgprot_noncached(vma_prot); | |
66 | else if (file->f_flags & O_SYNC) | |
67 | return pgprot_writecombine(vma_prot); | |
68 | return vma_prot; | |
69 | } | |
70 | EXPORT_SYMBOL(phys_mem_access_prot); | |
71 | ||
f4710445 | 72 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 73 | { |
7142392d SP |
74 | phys_addr_t phys; |
75 | void *ptr; | |
76 | ||
21ab99c2 | 77 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
f4710445 MR |
78 | |
79 | /* | |
80 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
81 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
82 | * any level of table. | |
83 | */ | |
84 | ptr = pte_set_fixmap(phys); | |
85 | ||
21ab99c2 MR |
86 | memset(ptr, 0, PAGE_SIZE); |
87 | ||
f4710445 MR |
88 | /* |
89 | * Implicit barriers also ensure the zeroed page is visible to the page | |
90 | * table walker | |
91 | */ | |
92 | pte_clear_fixmap(); | |
93 | ||
94 | return phys; | |
c1cc1552 CM |
95 | } |
96 | ||
e98216b5 AB |
97 | static bool pgattr_change_is_safe(u64 old, u64 new) |
98 | { | |
99 | /* | |
100 | * The following mapping attributes may be updated in live | |
101 | * kernel mappings without the need for break-before-make. | |
102 | */ | |
103 | static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE; | |
104 | ||
105 | return old == 0 || new == 0 || ((old ^ new) & ~mask) == 0; | |
106 | } | |
107 | ||
da141706 | 108 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
667c2759 | 109 | unsigned long end, unsigned long pfn, |
da141706 | 110 | pgprot_t prot, |
0bfc445d AB |
111 | phys_addr_t (*pgtable_alloc)(void), |
112 | bool page_mappings_only) | |
c1cc1552 | 113 | { |
0bfc445d | 114 | pgprot_t __prot = prot; |
c1cc1552 CM |
115 | pte_t *pte; |
116 | ||
4133af6c CM |
117 | BUG_ON(pmd_sect(*pmd)); |
118 | if (pmd_none(*pmd)) { | |
132233a7 LA |
119 | phys_addr_t pte_phys; |
120 | BUG_ON(!pgtable_alloc); | |
121 | pte_phys = pgtable_alloc(); | |
f4710445 | 122 | pte = pte_set_fixmap(pte_phys); |
f4710445 | 123 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
f4710445 | 124 | pte_clear_fixmap(); |
c1cc1552 | 125 | } |
a1c76574 | 126 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 127 | |
f4710445 | 128 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 129 | do { |
e98216b5 AB |
130 | pte_t old_pte = *pte; |
131 | ||
0bfc445d AB |
132 | /* |
133 | * Set the contiguous bit for the subsequent group of PTEs if | |
134 | * its size and alignment are appropriate. | |
135 | */ | |
136 | if (((addr | PFN_PHYS(pfn)) & ~CONT_PTE_MASK) == 0) { | |
137 | if (end - addr >= CONT_PTE_SIZE && !page_mappings_only) | |
138 | __prot = __pgprot(pgprot_val(prot) | PTE_CONT); | |
139 | else | |
140 | __prot = prot; | |
141 | } | |
142 | ||
143 | set_pte(pte, pfn_pte(pfn, __prot)); | |
667c2759 | 144 | pfn++; |
e98216b5 AB |
145 | |
146 | /* | |
147 | * After the PTE entry has been populated once, we | |
148 | * only allow updates to the permission attributes. | |
149 | */ | |
150 | BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte))); | |
151 | ||
667c2759 | 152 | } while (pte++, addr += PAGE_SIZE, addr != end); |
f4710445 MR |
153 | |
154 | pte_clear_fixmap(); | |
c1cc1552 CM |
155 | } |
156 | ||
11509a30 | 157 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 158 | phys_addr_t phys, pgprot_t prot, |
53e1b329 | 159 | phys_addr_t (*pgtable_alloc)(void), |
f14c66ce | 160 | bool page_mappings_only) |
c1cc1552 | 161 | { |
0bfc445d | 162 | pgprot_t __prot = prot; |
c1cc1552 CM |
163 | pmd_t *pmd; |
164 | unsigned long next; | |
165 | ||
166 | /* | |
167 | * Check for initial section mappings in the pgd/pud and remove them. | |
168 | */ | |
4133af6c CM |
169 | BUG_ON(pud_sect(*pud)); |
170 | if (pud_none(*pud)) { | |
132233a7 LA |
171 | phys_addr_t pmd_phys; |
172 | BUG_ON(!pgtable_alloc); | |
173 | pmd_phys = pgtable_alloc(); | |
f4710445 | 174 | pmd = pmd_set_fixmap(pmd_phys); |
f4710445 | 175 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
f4710445 | 176 | pmd_clear_fixmap(); |
c1cc1552 | 177 | } |
a1c76574 | 178 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 179 | |
f4710445 | 180 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 | 181 | do { |
e98216b5 AB |
182 | pmd_t old_pmd = *pmd; |
183 | ||
c1cc1552 | 184 | next = pmd_addr_end(addr, end); |
e98216b5 | 185 | |
c1cc1552 | 186 | /* try section mapping first */ |
83863f25 | 187 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
f14c66ce | 188 | !page_mappings_only) { |
0bfc445d AB |
189 | /* |
190 | * Set the contiguous bit for the subsequent group of | |
191 | * PMDs if its size and alignment are appropriate. | |
192 | */ | |
193 | if (((addr | phys) & ~CONT_PMD_MASK) == 0) { | |
194 | if (end - addr >= CONT_PMD_SIZE) | |
195 | __prot = __pgprot(pgprot_val(prot) | | |
196 | PTE_CONT); | |
197 | else | |
198 | __prot = prot; | |
199 | } | |
200 | pmd_set_huge(pmd, phys, __prot); | |
e98216b5 | 201 | |
a55f9929 | 202 | /* |
e98216b5 AB |
203 | * After the PMD entry has been populated once, we |
204 | * only allow updates to the permission attributes. | |
a55f9929 | 205 | */ |
e98216b5 AB |
206 | BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd), |
207 | pmd_val(*pmd))); | |
a55f9929 | 208 | } else { |
667c2759 | 209 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
0bfc445d AB |
210 | prot, pgtable_alloc, |
211 | page_mappings_only); | |
e98216b5 AB |
212 | |
213 | BUG_ON(pmd_val(old_pmd) != 0 && | |
214 | pmd_val(old_pmd) != pmd_val(*pmd)); | |
a55f9929 | 215 | } |
c1cc1552 CM |
216 | phys += next - addr; |
217 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
218 | |
219 | pmd_clear_fixmap(); | |
c1cc1552 CM |
220 | } |
221 | ||
da141706 LA |
222 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
223 | unsigned long phys) | |
224 | { | |
225 | if (PAGE_SHIFT != 12) | |
226 | return false; | |
227 | ||
228 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
229 | return false; | |
230 | ||
231 | return true; | |
232 | } | |
233 | ||
11509a30 | 234 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 235 | phys_addr_t phys, pgprot_t prot, |
53e1b329 | 236 | phys_addr_t (*pgtable_alloc)(void), |
f14c66ce | 237 | bool page_mappings_only) |
c1cc1552 | 238 | { |
c79b954b | 239 | pud_t *pud; |
c1cc1552 CM |
240 | unsigned long next; |
241 | ||
c79b954b | 242 | if (pgd_none(*pgd)) { |
132233a7 LA |
243 | phys_addr_t pud_phys; |
244 | BUG_ON(!pgtable_alloc); | |
245 | pud_phys = pgtable_alloc(); | |
f4710445 | 246 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
247 | } |
248 | BUG_ON(pgd_bad(*pgd)); | |
249 | ||
f4710445 | 250 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 | 251 | do { |
e98216b5 AB |
252 | pud_t old_pud = *pud; |
253 | ||
c1cc1552 | 254 | next = pud_addr_end(addr, end); |
206a2a73 SC |
255 | |
256 | /* | |
257 | * For 4K granule only, attempt to put down a 1GB block | |
258 | */ | |
f14c66ce | 259 | if (use_1G_block(addr, next, phys) && !page_mappings_only) { |
c661cb1c | 260 | pud_set_huge(pud, phys, prot); |
206a2a73 SC |
261 | |
262 | /* | |
e98216b5 AB |
263 | * After the PUD entry has been populated once, we |
264 | * only allow updates to the permission attributes. | |
206a2a73 | 265 | */ |
e98216b5 AB |
266 | BUG_ON(!pgattr_change_is_safe(pud_val(old_pud), |
267 | pud_val(*pud))); | |
206a2a73 | 268 | } else { |
11509a30 | 269 | alloc_init_pmd(pud, addr, next, phys, prot, |
f14c66ce | 270 | pgtable_alloc, page_mappings_only); |
e98216b5 AB |
271 | |
272 | BUG_ON(pud_val(old_pud) != 0 && | |
273 | pud_val(old_pud) != pud_val(*pud)); | |
206a2a73 | 274 | } |
c1cc1552 CM |
275 | phys += next - addr; |
276 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
277 | |
278 | pud_clear_fixmap(); | |
c1cc1552 CM |
279 | } |
280 | ||
40f87d31 AB |
281 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
282 | unsigned long virt, phys_addr_t size, | |
283 | pgprot_t prot, | |
284 | phys_addr_t (*pgtable_alloc)(void), | |
f14c66ce | 285 | bool page_mappings_only) |
c1cc1552 CM |
286 | { |
287 | unsigned long addr, length, end, next; | |
40f87d31 | 288 | pgd_t *pgd = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 289 | |
cc5d2b3b MR |
290 | /* |
291 | * If the virtual and physical address don't have the same offset | |
292 | * within a page, we cannot map the region as the caller expects. | |
293 | */ | |
294 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
295 | return; | |
296 | ||
9c4e08a3 | 297 | phys &= PAGE_MASK; |
c1cc1552 CM |
298 | addr = virt & PAGE_MASK; |
299 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
300 | ||
c1cc1552 CM |
301 | end = addr + length; |
302 | do { | |
303 | next = pgd_addr_end(addr, end); | |
53e1b329 | 304 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc, |
f14c66ce | 305 | page_mappings_only); |
c1cc1552 CM |
306 | phys += next - addr; |
307 | } while (pgd++, addr = next, addr != end); | |
308 | } | |
309 | ||
1378dc3d | 310 | static phys_addr_t pgd_pgtable_alloc(void) |
da141706 | 311 | { |
21ab99c2 | 312 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
1378dc3d AB |
313 | if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) |
314 | BUG(); | |
21ab99c2 MR |
315 | |
316 | /* Ensure the zeroed page is visible to the page table walker */ | |
317 | dsb(ishst); | |
f4710445 | 318 | return __pa(ptr); |
da141706 LA |
319 | } |
320 | ||
132233a7 LA |
321 | /* |
322 | * This function can only be used to modify existing table entries, | |
323 | * without allocating new levels of table. Note that this permits the | |
324 | * creation of new section or page entries. | |
325 | */ | |
326 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 327 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
328 | { |
329 | if (virt < VMALLOC_START) { | |
330 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
331 | &phys, virt); | |
332 | return; | |
333 | } | |
f14c66ce | 334 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, false); |
d7ecbddf MS |
335 | } |
336 | ||
8ce837ce AB |
337 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
338 | unsigned long virt, phys_addr_t size, | |
f14c66ce | 339 | pgprot_t prot, bool page_mappings_only) |
8ce837ce | 340 | { |
1378dc3d AB |
341 | BUG_ON(mm == &init_mm); |
342 | ||
11509a30 | 343 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
f14c66ce | 344 | pgd_pgtable_alloc, page_mappings_only); |
d7ecbddf MS |
345 | } |
346 | ||
da141706 LA |
347 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
348 | phys_addr_t size, pgprot_t prot) | |
349 | { | |
350 | if (virt < VMALLOC_START) { | |
351 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
352 | &phys, virt); | |
353 | return; | |
354 | } | |
355 | ||
11509a30 | 356 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
f14c66ce | 357 | NULL, debug_pagealloc_enabled()); |
da141706 LA |
358 | } |
359 | ||
068a17a5 | 360 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 361 | { |
7eb90f2f | 362 | unsigned long kernel_start = __pa(_text); |
9fdc14c5 | 363 | unsigned long kernel_end = __pa(__init_begin); |
068a17a5 | 364 | |
da141706 | 365 | /* |
f9040773 AB |
366 | * Take care not to create a writable alias for the |
367 | * read-only text and rodata sections of the kernel image. | |
da141706 | 368 | */ |
068a17a5 | 369 | |
9fdc14c5 | 370 | /* No overlap with the kernel text/rodata */ |
068a17a5 MR |
371 | if (end < kernel_start || start >= kernel_end) { |
372 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
373 | end - start, PAGE_KERNEL, | |
53e1b329 | 374 | early_pgtable_alloc, |
f14c66ce | 375 | debug_pagealloc_enabled()); |
068a17a5 | 376 | return; |
da141706 LA |
377 | } |
378 | ||
068a17a5 | 379 | /* |
9fdc14c5 | 380 | * This block overlaps the kernel text/rodata mappings. |
f9040773 | 381 | * Map the portion(s) which don't overlap. |
068a17a5 MR |
382 | */ |
383 | if (start < kernel_start) | |
384 | __create_pgd_mapping(pgd, start, | |
385 | __phys_to_virt(start), | |
386 | kernel_start - start, PAGE_KERNEL, | |
53e1b329 | 387 | early_pgtable_alloc, |
f14c66ce | 388 | debug_pagealloc_enabled()); |
068a17a5 MR |
389 | if (kernel_end < end) |
390 | __create_pgd_mapping(pgd, kernel_end, | |
391 | __phys_to_virt(kernel_end), | |
392 | end - kernel_end, PAGE_KERNEL, | |
53e1b329 | 393 | early_pgtable_alloc, |
f14c66ce | 394 | debug_pagealloc_enabled()); |
f9040773 AB |
395 | |
396 | /* | |
9fdc14c5 | 397 | * Map the linear alias of the [_text, __init_begin) interval as |
f9040773 AB |
398 | * read-only/non-executable. This makes the contents of the |
399 | * region accessible to subsystems such as hibernate, but | |
400 | * protects it from inadvertent modification or execution. | |
401 | */ | |
402 | __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start), | |
403 | kernel_end - kernel_start, PAGE_KERNEL_RO, | |
f14c66ce | 404 | early_pgtable_alloc, debug_pagealloc_enabled()); |
da141706 | 405 | } |
da141706 | 406 | |
068a17a5 | 407 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
408 | { |
409 | struct memblock_region *reg; | |
f6bc87c3 | 410 | |
c1cc1552 CM |
411 | /* map all the memory banks */ |
412 | for_each_memblock(memory, reg) { | |
413 | phys_addr_t start = reg->base; | |
414 | phys_addr_t end = start + reg->size; | |
415 | ||
416 | if (start >= end) | |
417 | break; | |
68709f45 AB |
418 | if (memblock_is_nomap(reg)) |
419 | continue; | |
c1cc1552 | 420 | |
068a17a5 | 421 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
422 | } |
423 | } | |
424 | ||
da141706 LA |
425 | void mark_rodata_ro(void) |
426 | { | |
2f39b5f9 | 427 | unsigned long section_size; |
f9040773 | 428 | |
9fdc14c5 | 429 | section_size = (unsigned long)_etext - (unsigned long)_text; |
7eb90f2f | 430 | create_mapping_late(__pa(_text), (unsigned long)_text, |
2f39b5f9 JL |
431 | section_size, PAGE_KERNEL_ROX); |
432 | /* | |
9fdc14c5 AB |
433 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
434 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 435 | */ |
9fdc14c5 | 436 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
2f39b5f9 JL |
437 | create_mapping_late(__pa(__start_rodata), (unsigned long)__start_rodata, |
438 | section_size, PAGE_KERNEL_RO); | |
e98216b5 AB |
439 | |
440 | /* flush the TLBs after updating live kernel mappings */ | |
441 | flush_tlb_all(); | |
1404d6f1 LA |
442 | |
443 | debug_checkwx(); | |
da141706 | 444 | } |
da141706 | 445 | |
2c09ec06 AB |
446 | static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end, |
447 | pgprot_t prot, struct vm_struct *vma) | |
068a17a5 MR |
448 | { |
449 | phys_addr_t pa_start = __pa(va_start); | |
450 | unsigned long size = va_end - va_start; | |
451 | ||
452 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
453 | BUG_ON(!PAGE_ALIGNED(size)); | |
454 | ||
455 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
f14c66ce | 456 | early_pgtable_alloc, debug_pagealloc_enabled()); |
f9040773 AB |
457 | |
458 | vma->addr = va_start; | |
459 | vma->phys_addr = pa_start; | |
460 | vma->size = size; | |
461 | vma->flags = VM_MAP; | |
462 | vma->caller = __builtin_return_address(0); | |
463 | ||
464 | vm_area_add_early(vma); | |
068a17a5 MR |
465 | } |
466 | ||
467 | /* | |
468 | * Create fine-grained mappings for the kernel. | |
469 | */ | |
470 | static void __init map_kernel(pgd_t *pgd) | |
471 | { | |
2f39b5f9 | 472 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_init, vmlinux_data; |
068a17a5 | 473 | |
9fdc14c5 AB |
474 | map_kernel_segment(pgd, _text, _etext, PAGE_KERNEL_EXEC, &vmlinux_text); |
475 | map_kernel_segment(pgd, __start_rodata, __init_begin, PAGE_KERNEL, &vmlinux_rodata); | |
2c09ec06 AB |
476 | map_kernel_segment(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC, |
477 | &vmlinux_init); | |
478 | map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data); | |
068a17a5 | 479 | |
f9040773 AB |
480 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
481 | /* | |
482 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
483 | * live in the carveout for the swapper_pg_dir. We can simply | |
484 | * re-use the existing dir for the fixmap. | |
485 | */ | |
486 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
487 | *pgd_offset_k(FIXADDR_START)); | |
488 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
489 | /* | |
490 | * The fixmap shares its top level pgd entry with the kernel | |
491 | * mapping. This can really only occur when we are running | |
492 | * with 16k/4 levels, so we can simply reuse the pud level | |
493 | * entry instead. | |
494 | */ | |
495 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
496 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
497 | __pud(__pa(bm_pmd) | PUD_TYPE_TABLE)); | |
498 | pud_clear_fixmap(); | |
499 | } else { | |
500 | BUG(); | |
501 | } | |
068a17a5 MR |
502 | |
503 | kasan_copy_shadow(pgd); | |
504 | } | |
505 | ||
c1cc1552 CM |
506 | /* |
507 | * paging_init() sets up the page tables, initialises the zone memory | |
508 | * maps and sets up the zero page. | |
509 | */ | |
510 | void __init paging_init(void) | |
511 | { | |
068a17a5 MR |
512 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
513 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
514 | ||
515 | map_kernel(pgd); | |
516 | map_mem(pgd); | |
517 | ||
518 | /* | |
519 | * We want to reuse the original swapper_pg_dir so we don't have to | |
520 | * communicate the new address to non-coherent secondaries in | |
521 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
522 | * adrp+add rather than a load from some global variable. | |
523 | * | |
524 | * To do this we need to go via a temporary pgd. | |
525 | */ | |
526 | cpu_replace_ttbr1(__va(pgd_phys)); | |
527 | memcpy(swapper_pg_dir, pgd, PAGE_SIZE); | |
528 | cpu_replace_ttbr1(swapper_pg_dir); | |
529 | ||
530 | pgd_clear_fixmap(); | |
531 | memblock_free(pgd_phys, PAGE_SIZE); | |
532 | ||
533 | /* | |
534 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
535 | * allocated with it. | |
536 | */ | |
537 | memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE, | |
538 | SWAPPER_DIR_SIZE - PAGE_SIZE); | |
c1cc1552 CM |
539 | } |
540 | ||
c1cc1552 CM |
541 | /* |
542 | * Check whether a kernel address is valid (derived from arch/x86/). | |
543 | */ | |
544 | int kern_addr_valid(unsigned long addr) | |
545 | { | |
546 | pgd_t *pgd; | |
547 | pud_t *pud; | |
548 | pmd_t *pmd; | |
549 | pte_t *pte; | |
550 | ||
551 | if ((((long)addr) >> VA_BITS) != -1UL) | |
552 | return 0; | |
553 | ||
554 | pgd = pgd_offset_k(addr); | |
555 | if (pgd_none(*pgd)) | |
556 | return 0; | |
557 | ||
558 | pud = pud_offset(pgd, addr); | |
559 | if (pud_none(*pud)) | |
560 | return 0; | |
561 | ||
206a2a73 SC |
562 | if (pud_sect(*pud)) |
563 | return pfn_valid(pud_pfn(*pud)); | |
564 | ||
c1cc1552 CM |
565 | pmd = pmd_offset(pud, addr); |
566 | if (pmd_none(*pmd)) | |
567 | return 0; | |
568 | ||
da6e4cb6 DA |
569 | if (pmd_sect(*pmd)) |
570 | return pfn_valid(pmd_pfn(*pmd)); | |
571 | ||
c1cc1552 CM |
572 | pte = pte_offset_kernel(pmd, addr); |
573 | if (pte_none(*pte)) | |
574 | return 0; | |
575 | ||
576 | return pfn_valid(pte_pfn(*pte)); | |
577 | } | |
578 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 579 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 580 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 581 | { |
0aad818b | 582 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 583 | } |
b433dce0 | 584 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 585 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 586 | { |
0aad818b | 587 | unsigned long addr = start; |
c1cc1552 CM |
588 | unsigned long next; |
589 | pgd_t *pgd; | |
590 | pud_t *pud; | |
591 | pmd_t *pmd; | |
592 | ||
593 | do { | |
594 | next = pmd_addr_end(addr, end); | |
595 | ||
596 | pgd = vmemmap_pgd_populate(addr, node); | |
597 | if (!pgd) | |
598 | return -ENOMEM; | |
599 | ||
600 | pud = vmemmap_pud_populate(pgd, addr, node); | |
601 | if (!pud) | |
602 | return -ENOMEM; | |
603 | ||
604 | pmd = pmd_offset(pud, addr); | |
605 | if (pmd_none(*pmd)) { | |
606 | void *p = NULL; | |
607 | ||
608 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
609 | if (!p) | |
610 | return -ENOMEM; | |
611 | ||
a501e324 | 612 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
613 | } else |
614 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
615 | } while (addr = next, addr != end); | |
616 | ||
617 | return 0; | |
618 | } | |
619 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 620 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
621 | { |
622 | } | |
c1cc1552 | 623 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 624 | |
af86e597 LA |
625 | static inline pud_t * fixmap_pud(unsigned long addr) |
626 | { | |
627 | pgd_t *pgd = pgd_offset_k(addr); | |
628 | ||
629 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
630 | ||
157962f5 | 631 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
632 | } |
633 | ||
634 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
635 | { | |
636 | pud_t *pud = fixmap_pud(addr); | |
637 | ||
638 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
639 | ||
157962f5 | 640 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
641 | } |
642 | ||
643 | static inline pte_t * fixmap_pte(unsigned long addr) | |
644 | { | |
157962f5 | 645 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
646 | } |
647 | ||
648 | void __init early_fixmap_init(void) | |
649 | { | |
650 | pgd_t *pgd; | |
651 | pud_t *pud; | |
652 | pmd_t *pmd; | |
653 | unsigned long addr = FIXADDR_START; | |
654 | ||
655 | pgd = pgd_offset_k(addr); | |
f80fb3a3 AB |
656 | if (CONFIG_PGTABLE_LEVELS > 3 && |
657 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa(bm_pud))) { | |
f9040773 AB |
658 | /* |
659 | * We only end up here if the kernel mapping and the fixmap | |
660 | * share the top level pgd entry, which should only happen on | |
661 | * 16k/4 levels configurations. | |
662 | */ | |
663 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
664 | pud = pud_offset_kimg(pgd, addr); | |
665 | } else { | |
666 | pgd_populate(&init_mm, pgd, bm_pud); | |
667 | pud = fixmap_pud(addr); | |
668 | } | |
af86e597 | 669 | pud_populate(&init_mm, pud, bm_pmd); |
157962f5 | 670 | pmd = fixmap_pmd(addr); |
af86e597 LA |
671 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
672 | ||
673 | /* | |
674 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 675 | * we are not prepared: |
af86e597 LA |
676 | */ |
677 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
678 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
679 | ||
680 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
681 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
682 | WARN_ON(1); | |
683 | pr_warn("pmd %p != %p, %p\n", | |
684 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
685 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
686 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
687 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
688 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
689 | fix_to_virt(FIX_BTMAP_END)); | |
690 | ||
691 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
692 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
693 | } | |
694 | } | |
695 | ||
696 | void __set_fixmap(enum fixed_addresses idx, | |
697 | phys_addr_t phys, pgprot_t flags) | |
698 | { | |
699 | unsigned long addr = __fix_to_virt(idx); | |
700 | pte_t *pte; | |
701 | ||
b63dbef9 | 702 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
703 | |
704 | pte = fixmap_pte(addr); | |
705 | ||
706 | if (pgprot_val(flags)) { | |
707 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
708 | } else { | |
709 | pte_clear(&init_mm, addr, pte); | |
710 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
711 | } | |
712 | } | |
61bd93ce | 713 | |
f80fb3a3 | 714 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
715 | { |
716 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 717 | int offset; |
61bd93ce AB |
718 | void *dt_virt; |
719 | ||
720 | /* | |
721 | * Check whether the physical FDT address is set and meets the minimum | |
722 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
723 | * at least 8 bytes so that we can always access the magic and size |
724 | * fields of the FDT header after mapping the first chunk, double check | |
725 | * here if that is indeed the case. | |
61bd93ce AB |
726 | */ |
727 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
728 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
729 | return NULL; | |
730 | ||
731 | /* | |
732 | * Make sure that the FDT region can be mapped without the need to | |
733 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 734 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
735 | * |
736 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
737 | * be in the same PMD as the rest of the fixmap. | |
738 | * On 4k pages, we'll use section mappings for the FDT so we only | |
739 | * have to be in the same PUD. | |
740 | */ | |
741 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
742 | ||
b433dce0 SP |
743 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
744 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 745 | |
b433dce0 | 746 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
747 | dt_virt = (void *)dt_virt_base + offset; |
748 | ||
749 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
750 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
751 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 752 | |
04a84810 | 753 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
754 | return NULL; |
755 | ||
f80fb3a3 AB |
756 | *size = fdt_totalsize(dt_virt); |
757 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
758 | return NULL; |
759 | ||
f80fb3a3 | 760 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 761 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 762 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 763 | |
f80fb3a3 AB |
764 | return dt_virt; |
765 | } | |
61bd93ce | 766 | |
f80fb3a3 AB |
767 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
768 | { | |
769 | void *dt_virt; | |
770 | int size; | |
771 | ||
772 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
773 | if (!dt_virt) | |
774 | return NULL; | |
775 | ||
776 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
777 | return dt_virt; |
778 | } | |
324420bf AB |
779 | |
780 | int __init arch_ioremap_pud_supported(void) | |
781 | { | |
782 | /* only 4k granule supports level 1 block mappings */ | |
783 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
784 | } | |
785 | ||
786 | int __init arch_ioremap_pmd_supported(void) | |
787 | { | |
788 | return 1; | |
789 | } | |
790 | ||
791 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
792 | { | |
793 | BUG_ON(phys & ~PUD_MASK); | |
794 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
795 | return 1; | |
796 | } | |
797 | ||
798 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
799 | { | |
800 | BUG_ON(phys & ~PMD_MASK); | |
801 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
802 | return 1; | |
803 | } | |
804 | ||
805 | int pud_clear_huge(pud_t *pud) | |
806 | { | |
807 | if (!pud_sect(*pud)) | |
808 | return 0; | |
809 | pud_clear(pud); | |
810 | return 1; | |
811 | } | |
812 | ||
813 | int pmd_clear_huge(pmd_t *pmd) | |
814 | { | |
815 | if (!pmd_sect(*pmd)) | |
816 | return 0; | |
817 | pmd_clear(pmd); | |
818 | return 1; | |
819 | } |