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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 | ||
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 | ||
c1cc1552 CM |
49 | /* |
50 | * Empty_zero_page is a special page that is used for zero-initialized data | |
51 | * and COW. | |
52 | */ | |
5227cfa7 | 53 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
54 | EXPORT_SYMBOL(empty_zero_page); |
55 | ||
c1cc1552 CM |
56 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
57 | unsigned long size, pgprot_t vma_prot) | |
58 | { | |
59 | if (!pfn_valid(pfn)) | |
60 | return pgprot_noncached(vma_prot); | |
61 | else if (file->f_flags & O_SYNC) | |
62 | return pgprot_writecombine(vma_prot); | |
63 | return vma_prot; | |
64 | } | |
65 | EXPORT_SYMBOL(phys_mem_access_prot); | |
66 | ||
f4710445 | 67 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 68 | { |
7142392d SP |
69 | phys_addr_t phys; |
70 | void *ptr; | |
71 | ||
21ab99c2 | 72 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
7142392d | 73 | BUG_ON(!phys); |
f4710445 MR |
74 | |
75 | /* | |
76 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
77 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
78 | * any level of table. | |
79 | */ | |
80 | ptr = pte_set_fixmap(phys); | |
81 | ||
21ab99c2 MR |
82 | memset(ptr, 0, PAGE_SIZE); |
83 | ||
f4710445 MR |
84 | /* |
85 | * Implicit barriers also ensure the zeroed page is visible to the page | |
86 | * table walker | |
87 | */ | |
88 | pte_clear_fixmap(); | |
89 | ||
90 | return phys; | |
c1cc1552 CM |
91 | } |
92 | ||
da141706 LA |
93 | /* |
94 | * remap a PMD into pages | |
95 | */ | |
96 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
97 | { | |
98 | unsigned long pfn = pmd_pfn(*pmd); | |
99 | int i = 0; | |
100 | ||
101 | do { | |
102 | /* | |
103 | * Need to have the least restrictive permissions available | |
667c2759 | 104 | * permissions will be fixed up later |
da141706 | 105 | */ |
667c2759 | 106 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
da141706 LA |
107 | pfn++; |
108 | } while (pte++, i++, i < PTRS_PER_PTE); | |
109 | } | |
110 | ||
111 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
667c2759 | 112 | unsigned long end, unsigned long pfn, |
da141706 | 113 | pgprot_t prot, |
f4710445 | 114 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
115 | { |
116 | pte_t *pte; | |
117 | ||
a1c76574 | 118 | if (pmd_none(*pmd) || pmd_sect(*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); |
da141706 LA |
123 | if (pmd_sect(*pmd)) |
124 | split_pmd(pmd, pte); | |
f4710445 | 125 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
da141706 | 126 | flush_tlb_all(); |
f4710445 | 127 | pte_clear_fixmap(); |
c1cc1552 | 128 | } |
a1c76574 | 129 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 130 | |
f4710445 | 131 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 132 | do { |
667c2759 CM |
133 | set_pte(pte, pfn_pte(pfn, prot)); |
134 | pfn++; | |
135 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
f4710445 MR |
136 | |
137 | pte_clear_fixmap(); | |
c1cc1552 CM |
138 | } |
139 | ||
9a17a213 | 140 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
da141706 LA |
141 | { |
142 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
143 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
144 | int i = 0; | |
145 | ||
146 | do { | |
1e43ba9c | 147 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
da141706 LA |
148 | addr += PMD_SIZE; |
149 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
150 | } | |
151 | ||
11509a30 | 152 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 153 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 154 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
155 | { |
156 | pmd_t *pmd; | |
157 | unsigned long next; | |
158 | ||
159 | /* | |
160 | * Check for initial section mappings in the pgd/pud and remove them. | |
161 | */ | |
a1c76574 | 162 | if (pud_none(*pud) || pud_sect(*pud)) { |
132233a7 LA |
163 | phys_addr_t pmd_phys; |
164 | BUG_ON(!pgtable_alloc); | |
165 | pmd_phys = pgtable_alloc(); | |
f4710445 | 166 | pmd = pmd_set_fixmap(pmd_phys); |
da141706 LA |
167 | if (pud_sect(*pud)) { |
168 | /* | |
169 | * need to have the 1G of mappings continue to be | |
170 | * present | |
171 | */ | |
172 | split_pud(pud, pmd); | |
173 | } | |
f4710445 | 174 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
da141706 | 175 | flush_tlb_all(); |
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 CM |
181 | do { |
182 | next = pmd_addr_end(addr, end); | |
183 | /* try section mapping first */ | |
a55f9929 CM |
184 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
185 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
186 | set_pmd(pmd, __pmd(phys | |
187 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
188 | /* |
189 | * Check for previous table entries created during | |
190 | * boot (__create_page_tables) and flush them. | |
191 | */ | |
523d6e9f | 192 | if (!pmd_none(old_pmd)) { |
a55f9929 | 193 | flush_tlb_all(); |
523d6e9f | 194 | if (pmd_table(old_pmd)) { |
316b39db | 195 | phys_addr_t table = pmd_page_paddr(old_pmd); |
41089357 CM |
196 | if (!WARN_ON_ONCE(slab_is_available())) |
197 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 198 | } |
199 | } | |
a55f9929 | 200 | } else { |
667c2759 | 201 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
21ab99c2 | 202 | prot, pgtable_alloc); |
a55f9929 | 203 | } |
c1cc1552 CM |
204 | phys += next - addr; |
205 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
206 | |
207 | pmd_clear_fixmap(); | |
c1cc1552 CM |
208 | } |
209 | ||
da141706 LA |
210 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
211 | unsigned long phys) | |
212 | { | |
213 | if (PAGE_SHIFT != 12) | |
214 | return false; | |
215 | ||
216 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
217 | return false; | |
218 | ||
219 | return true; | |
220 | } | |
221 | ||
11509a30 | 222 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 223 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 224 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 | 225 | { |
c79b954b | 226 | pud_t *pud; |
c1cc1552 CM |
227 | unsigned long next; |
228 | ||
c79b954b | 229 | if (pgd_none(*pgd)) { |
132233a7 LA |
230 | phys_addr_t pud_phys; |
231 | BUG_ON(!pgtable_alloc); | |
232 | pud_phys = pgtable_alloc(); | |
f4710445 | 233 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
234 | } |
235 | BUG_ON(pgd_bad(*pgd)); | |
236 | ||
f4710445 | 237 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 CM |
238 | do { |
239 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
240 | |
241 | /* | |
242 | * For 4K granule only, attempt to put down a 1GB block | |
243 | */ | |
da141706 | 244 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 245 | pud_t old_pud = *pud; |
8ce837ce AB |
246 | set_pud(pud, __pud(phys | |
247 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
248 | |
249 | /* | |
250 | * If we have an old value for a pud, it will | |
251 | * be pointing to a pmd table that we no longer | |
252 | * need (from swapper_pg_dir). | |
253 | * | |
254 | * Look up the old pmd table and free it. | |
255 | */ | |
256 | if (!pud_none(old_pud)) { | |
206a2a73 | 257 | flush_tlb_all(); |
523d6e9f | 258 | if (pud_table(old_pud)) { |
316b39db | 259 | phys_addr_t table = pud_page_paddr(old_pud); |
41089357 CM |
260 | if (!WARN_ON_ONCE(slab_is_available())) |
261 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 262 | } |
206a2a73 SC |
263 | } |
264 | } else { | |
11509a30 | 265 | alloc_init_pmd(pud, addr, next, phys, prot, |
21ab99c2 | 266 | pgtable_alloc); |
206a2a73 | 267 | } |
c1cc1552 CM |
268 | phys += next - addr; |
269 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
270 | |
271 | pud_clear_fixmap(); | |
c1cc1552 CM |
272 | } |
273 | ||
274 | /* | |
275 | * Create the page directory entries and any necessary page tables for the | |
276 | * mapping specified by 'md'. | |
277 | */ | |
11509a30 | 278 | static void init_pgd(pgd_t *pgd, phys_addr_t phys, unsigned long virt, |
da141706 | 279 | phys_addr_t size, pgprot_t prot, |
f4710445 | 280 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
281 | { |
282 | unsigned long addr, length, end, next; | |
c1cc1552 | 283 | |
cc5d2b3b MR |
284 | /* |
285 | * If the virtual and physical address don't have the same offset | |
286 | * within a page, we cannot map the region as the caller expects. | |
287 | */ | |
288 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
289 | return; | |
290 | ||
9c4e08a3 | 291 | phys &= PAGE_MASK; |
c1cc1552 CM |
292 | addr = virt & PAGE_MASK; |
293 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
294 | ||
c1cc1552 CM |
295 | end = addr + length; |
296 | do { | |
297 | next = pgd_addr_end(addr, end); | |
11509a30 | 298 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc); |
c1cc1552 CM |
299 | phys += next - addr; |
300 | } while (pgd++, addr = next, addr != end); | |
301 | } | |
302 | ||
f4710445 | 303 | static phys_addr_t late_pgtable_alloc(void) |
da141706 | 304 | { |
21ab99c2 | 305 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
da141706 | 306 | BUG_ON(!ptr); |
21ab99c2 MR |
307 | |
308 | /* Ensure the zeroed page is visible to the page table walker */ | |
309 | dsb(ishst); | |
f4710445 | 310 | return __pa(ptr); |
da141706 LA |
311 | } |
312 | ||
11509a30 MR |
313 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
314 | unsigned long virt, phys_addr_t size, | |
315 | pgprot_t prot, | |
316 | phys_addr_t (*alloc)(void)) | |
317 | { | |
318 | init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc); | |
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 | } | |
11509a30 | 334 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
132233a7 | 335 | NULL); |
d7ecbddf MS |
336 | } |
337 | ||
8ce837ce AB |
338 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
339 | unsigned long virt, phys_addr_t size, | |
340 | pgprot_t prot) | |
341 | { | |
11509a30 MR |
342 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
343 | late_pgtable_alloc); | |
d7ecbddf MS |
344 | } |
345 | ||
da141706 LA |
346 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
347 | phys_addr_t size, pgprot_t prot) | |
348 | { | |
349 | if (virt < VMALLOC_START) { | |
350 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
351 | &phys, virt); | |
352 | return; | |
353 | } | |
354 | ||
11509a30 MR |
355 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
356 | late_pgtable_alloc); | |
da141706 LA |
357 | } |
358 | ||
068a17a5 | 359 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 360 | { |
068a17a5 MR |
361 | |
362 | unsigned long kernel_start = __pa(_stext); | |
363 | unsigned long kernel_end = __pa(_end); | |
364 | ||
da141706 | 365 | /* |
068a17a5 MR |
366 | * The kernel itself is mapped at page granularity. Map all other |
367 | * memory, making sure we don't overwrite the existing kernel mappings. | |
da141706 | 368 | */ |
068a17a5 MR |
369 | |
370 | /* No overlap with the kernel. */ | |
371 | if (end < kernel_start || start >= kernel_end) { | |
372 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
373 | end - start, PAGE_KERNEL, | |
374 | early_pgtable_alloc); | |
375 | return; | |
da141706 LA |
376 | } |
377 | ||
068a17a5 MR |
378 | /* |
379 | * This block overlaps the kernel mapping. Map the portion(s) which | |
380 | * don't overlap. | |
381 | */ | |
382 | if (start < kernel_start) | |
383 | __create_pgd_mapping(pgd, start, | |
384 | __phys_to_virt(start), | |
385 | kernel_start - start, PAGE_KERNEL, | |
386 | early_pgtable_alloc); | |
387 | if (kernel_end < end) | |
388 | __create_pgd_mapping(pgd, kernel_end, | |
389 | __phys_to_virt(kernel_end), | |
390 | end - kernel_end, PAGE_KERNEL, | |
391 | early_pgtable_alloc); | |
da141706 | 392 | } |
da141706 | 393 | |
068a17a5 | 394 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
395 | { |
396 | struct memblock_region *reg; | |
f6bc87c3 | 397 | |
c1cc1552 CM |
398 | /* map all the memory banks */ |
399 | for_each_memblock(memory, reg) { | |
400 | phys_addr_t start = reg->base; | |
401 | phys_addr_t end = start + reg->size; | |
402 | ||
403 | if (start >= end) | |
404 | break; | |
68709f45 AB |
405 | if (memblock_is_nomap(reg)) |
406 | continue; | |
c1cc1552 | 407 | |
068a17a5 | 408 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
409 | } |
410 | } | |
411 | ||
da141706 LA |
412 | #ifdef CONFIG_DEBUG_RODATA |
413 | void mark_rodata_ro(void) | |
414 | { | |
415 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
416 | (unsigned long)_etext - (unsigned long)_stext, | |
0b2aa5b8 | 417 | PAGE_KERNEL_ROX); |
da141706 LA |
418 | |
419 | } | |
420 | #endif | |
421 | ||
422 | void fixup_init(void) | |
423 | { | |
424 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
425 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
426 | PAGE_KERNEL); | |
427 | } | |
428 | ||
068a17a5 MR |
429 | static void __init map_kernel_chunk(pgd_t *pgd, void *va_start, void *va_end, |
430 | pgprot_t prot) | |
431 | { | |
432 | phys_addr_t pa_start = __pa(va_start); | |
433 | unsigned long size = va_end - va_start; | |
434 | ||
435 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
436 | BUG_ON(!PAGE_ALIGNED(size)); | |
437 | ||
438 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
439 | early_pgtable_alloc); | |
440 | } | |
441 | ||
442 | /* | |
443 | * Create fine-grained mappings for the kernel. | |
444 | */ | |
445 | static void __init map_kernel(pgd_t *pgd) | |
446 | { | |
447 | ||
448 | map_kernel_chunk(pgd, _stext, _etext, PAGE_KERNEL_EXEC); | |
449 | map_kernel_chunk(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC); | |
450 | map_kernel_chunk(pgd, _data, _end, PAGE_KERNEL); | |
451 | ||
452 | /* | |
453 | * The fixmap falls in a separate pgd to the kernel, and doesn't live | |
454 | * in the carveout for the swapper_pg_dir. We can simply re-use the | |
455 | * existing dir for the fixmap. | |
456 | */ | |
457 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), *pgd_offset_k(FIXADDR_START)); | |
458 | ||
459 | kasan_copy_shadow(pgd); | |
460 | } | |
461 | ||
c1cc1552 CM |
462 | /* |
463 | * paging_init() sets up the page tables, initialises the zone memory | |
464 | * maps and sets up the zero page. | |
465 | */ | |
466 | void __init paging_init(void) | |
467 | { | |
068a17a5 MR |
468 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
469 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
470 | ||
471 | map_kernel(pgd); | |
472 | map_mem(pgd); | |
473 | ||
474 | /* | |
475 | * We want to reuse the original swapper_pg_dir so we don't have to | |
476 | * communicate the new address to non-coherent secondaries in | |
477 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
478 | * adrp+add rather than a load from some global variable. | |
479 | * | |
480 | * To do this we need to go via a temporary pgd. | |
481 | */ | |
482 | cpu_replace_ttbr1(__va(pgd_phys)); | |
483 | memcpy(swapper_pg_dir, pgd, PAGE_SIZE); | |
484 | cpu_replace_ttbr1(swapper_pg_dir); | |
485 | ||
486 | pgd_clear_fixmap(); | |
487 | memblock_free(pgd_phys, PAGE_SIZE); | |
488 | ||
489 | /* | |
490 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
491 | * allocated with it. | |
492 | */ | |
493 | memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE, | |
494 | SWAPPER_DIR_SIZE - PAGE_SIZE); | |
c1cc1552 | 495 | |
c1cc1552 | 496 | bootmem_init(); |
c1cc1552 CM |
497 | } |
498 | ||
c1cc1552 CM |
499 | /* |
500 | * Check whether a kernel address is valid (derived from arch/x86/). | |
501 | */ | |
502 | int kern_addr_valid(unsigned long addr) | |
503 | { | |
504 | pgd_t *pgd; | |
505 | pud_t *pud; | |
506 | pmd_t *pmd; | |
507 | pte_t *pte; | |
508 | ||
509 | if ((((long)addr) >> VA_BITS) != -1UL) | |
510 | return 0; | |
511 | ||
512 | pgd = pgd_offset_k(addr); | |
513 | if (pgd_none(*pgd)) | |
514 | return 0; | |
515 | ||
516 | pud = pud_offset(pgd, addr); | |
517 | if (pud_none(*pud)) | |
518 | return 0; | |
519 | ||
206a2a73 SC |
520 | if (pud_sect(*pud)) |
521 | return pfn_valid(pud_pfn(*pud)); | |
522 | ||
c1cc1552 CM |
523 | pmd = pmd_offset(pud, addr); |
524 | if (pmd_none(*pmd)) | |
525 | return 0; | |
526 | ||
da6e4cb6 DA |
527 | if (pmd_sect(*pmd)) |
528 | return pfn_valid(pmd_pfn(*pmd)); | |
529 | ||
c1cc1552 CM |
530 | pte = pte_offset_kernel(pmd, addr); |
531 | if (pte_none(*pte)) | |
532 | return 0; | |
533 | ||
534 | return pfn_valid(pte_pfn(*pte)); | |
535 | } | |
536 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 537 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 538 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 539 | { |
0aad818b | 540 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 541 | } |
b433dce0 | 542 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 543 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 544 | { |
0aad818b | 545 | unsigned long addr = start; |
c1cc1552 CM |
546 | unsigned long next; |
547 | pgd_t *pgd; | |
548 | pud_t *pud; | |
549 | pmd_t *pmd; | |
550 | ||
551 | do { | |
552 | next = pmd_addr_end(addr, end); | |
553 | ||
554 | pgd = vmemmap_pgd_populate(addr, node); | |
555 | if (!pgd) | |
556 | return -ENOMEM; | |
557 | ||
558 | pud = vmemmap_pud_populate(pgd, addr, node); | |
559 | if (!pud) | |
560 | return -ENOMEM; | |
561 | ||
562 | pmd = pmd_offset(pud, addr); | |
563 | if (pmd_none(*pmd)) { | |
564 | void *p = NULL; | |
565 | ||
566 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
567 | if (!p) | |
568 | return -ENOMEM; | |
569 | ||
a501e324 | 570 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
571 | } else |
572 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
573 | } while (addr = next, addr != end); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 578 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
579 | { |
580 | } | |
c1cc1552 | 581 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
582 | |
583 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
9f25e6ad | 584 | #if CONFIG_PGTABLE_LEVELS > 2 |
af86e597 LA |
585 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
586 | #endif | |
9f25e6ad | 587 | #if CONFIG_PGTABLE_LEVELS > 3 |
af86e597 LA |
588 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
589 | #endif | |
590 | ||
591 | static inline pud_t * fixmap_pud(unsigned long addr) | |
592 | { | |
593 | pgd_t *pgd = pgd_offset_k(addr); | |
594 | ||
595 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
596 | ||
597 | return pud_offset(pgd, addr); | |
598 | } | |
599 | ||
600 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
601 | { | |
602 | pud_t *pud = fixmap_pud(addr); | |
603 | ||
604 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
605 | ||
606 | return pmd_offset(pud, addr); | |
607 | } | |
608 | ||
609 | static inline pte_t * fixmap_pte(unsigned long addr) | |
610 | { | |
611 | pmd_t *pmd = fixmap_pmd(addr); | |
612 | ||
613 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
614 | ||
615 | return pte_offset_kernel(pmd, addr); | |
616 | } | |
617 | ||
618 | void __init early_fixmap_init(void) | |
619 | { | |
620 | pgd_t *pgd; | |
621 | pud_t *pud; | |
622 | pmd_t *pmd; | |
623 | unsigned long addr = FIXADDR_START; | |
624 | ||
625 | pgd = pgd_offset_k(addr); | |
626 | pgd_populate(&init_mm, pgd, bm_pud); | |
627 | pud = pud_offset(pgd, addr); | |
628 | pud_populate(&init_mm, pud, bm_pmd); | |
629 | pmd = pmd_offset(pud, addr); | |
630 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
631 | ||
632 | /* | |
633 | * The boot-ioremap range spans multiple pmds, for which | |
634 | * we are not preparted: | |
635 | */ | |
636 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
637 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
638 | ||
639 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
640 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
641 | WARN_ON(1); | |
642 | pr_warn("pmd %p != %p, %p\n", | |
643 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
644 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
645 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
646 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
647 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
648 | fix_to_virt(FIX_BTMAP_END)); | |
649 | ||
650 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
651 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
652 | } | |
653 | } | |
654 | ||
655 | void __set_fixmap(enum fixed_addresses idx, | |
656 | phys_addr_t phys, pgprot_t flags) | |
657 | { | |
658 | unsigned long addr = __fix_to_virt(idx); | |
659 | pte_t *pte; | |
660 | ||
b63dbef9 | 661 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
662 | |
663 | pte = fixmap_pte(addr); | |
664 | ||
665 | if (pgprot_val(flags)) { | |
666 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
667 | } else { | |
668 | pte_clear(&init_mm, addr, pte); | |
669 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
670 | } | |
671 | } | |
61bd93ce AB |
672 | |
673 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) | |
674 | { | |
675 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
fb226c3d | 676 | pgprot_t prot = PAGE_KERNEL_RO; |
b433dce0 | 677 | int size, offset; |
61bd93ce AB |
678 | void *dt_virt; |
679 | ||
680 | /* | |
681 | * Check whether the physical FDT address is set and meets the minimum | |
682 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
683 | * at least 8 bytes so that we can always access the size field of the | |
684 | * FDT header after mapping the first chunk, double check here if that | |
685 | * is indeed the case. | |
686 | */ | |
687 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
688 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
689 | return NULL; | |
690 | ||
691 | /* | |
692 | * Make sure that the FDT region can be mapped without the need to | |
693 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 694 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
695 | * |
696 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
697 | * be in the same PMD as the rest of the fixmap. | |
698 | * On 4k pages, we'll use section mappings for the FDT so we only | |
699 | * have to be in the same PUD. | |
700 | */ | |
701 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
702 | ||
b433dce0 SP |
703 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
704 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 705 | |
b433dce0 | 706 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
707 | dt_virt = (void *)dt_virt_base + offset; |
708 | ||
709 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
710 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
711 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce AB |
712 | |
713 | if (fdt_check_header(dt_virt) != 0) | |
714 | return NULL; | |
715 | ||
716 | size = fdt_totalsize(dt_virt); | |
717 | if (size > MAX_FDT_SIZE) | |
718 | return NULL; | |
719 | ||
b433dce0 | 720 | if (offset + size > SWAPPER_BLOCK_SIZE) |
132233a7 | 721 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
b433dce0 | 722 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce AB |
723 | |
724 | memblock_reserve(dt_phys, size); | |
725 | ||
726 | return dt_virt; | |
727 | } |