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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> | |
24 | #include <linux/mman.h> | |
25 | #include <linux/nodemask.h> | |
26 | #include <linux/memblock.h> | |
27 | #include <linux/fs.h> | |
2475ff9d | 28 | #include <linux/io.h> |
41089357 | 29 | #include <linux/slab.h> |
da141706 | 30 | #include <linux/stop_machine.h> |
c1cc1552 CM |
31 | |
32 | #include <asm/cputype.h> | |
af86e597 | 33 | #include <asm/fixmap.h> |
c1cc1552 CM |
34 | #include <asm/sections.h> |
35 | #include <asm/setup.h> | |
36 | #include <asm/sizes.h> | |
37 | #include <asm/tlb.h> | |
c79b954b | 38 | #include <asm/memblock.h> |
c1cc1552 CM |
39 | #include <asm/mmu_context.h> |
40 | ||
41 | #include "mm.h" | |
42 | ||
43 | /* | |
44 | * Empty_zero_page is a special page that is used for zero-initialized data | |
45 | * and COW. | |
46 | */ | |
47 | struct page *empty_zero_page; | |
48 | EXPORT_SYMBOL(empty_zero_page); | |
49 | ||
c1cc1552 CM |
50 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
51 | unsigned long size, pgprot_t vma_prot) | |
52 | { | |
53 | if (!pfn_valid(pfn)) | |
54 | return pgprot_noncached(vma_prot); | |
55 | else if (file->f_flags & O_SYNC) | |
56 | return pgprot_writecombine(vma_prot); | |
57 | return vma_prot; | |
58 | } | |
59 | EXPORT_SYMBOL(phys_mem_access_prot); | |
60 | ||
61 | static void __init *early_alloc(unsigned long sz) | |
62 | { | |
63 | void *ptr = __va(memblock_alloc(sz, sz)); | |
da141706 | 64 | BUG_ON(!ptr); |
c1cc1552 CM |
65 | memset(ptr, 0, sz); |
66 | return ptr; | |
67 | } | |
68 | ||
da141706 LA |
69 | /* |
70 | * remap a PMD into pages | |
71 | */ | |
72 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
73 | { | |
74 | unsigned long pfn = pmd_pfn(*pmd); | |
75 | int i = 0; | |
76 | ||
77 | do { | |
78 | /* | |
79 | * Need to have the least restrictive permissions available | |
80 | * permissions will be fixed up later | |
81 | */ | |
82 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); | |
83 | pfn++; | |
84 | } while (pte++, i++, i < PTRS_PER_PTE); | |
85 | } | |
86 | ||
87 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
d7ecbddf | 88 | unsigned long end, unsigned long pfn, |
da141706 LA |
89 | pgprot_t prot, |
90 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
91 | { |
92 | pte_t *pte; | |
93 | ||
a1c76574 | 94 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
da141706 LA |
95 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
96 | if (pmd_sect(*pmd)) | |
97 | split_pmd(pmd, pte); | |
c1cc1552 | 98 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
da141706 | 99 | flush_tlb_all(); |
c1cc1552 | 100 | } |
a1c76574 | 101 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 CM |
102 | |
103 | pte = pte_offset_kernel(pmd, addr); | |
104 | do { | |
d7ecbddf | 105 | set_pte(pte, pfn_pte(pfn, prot)); |
c1cc1552 CM |
106 | pfn++; |
107 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
108 | } | |
109 | ||
da141706 LA |
110 | void split_pud(pud_t *old_pud, pmd_t *pmd) |
111 | { | |
112 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
113 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
114 | int i = 0; | |
115 | ||
116 | do { | |
117 | set_pmd(pmd, __pmd(addr | prot)); | |
118 | addr += PMD_SIZE; | |
119 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
120 | } | |
121 | ||
122 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, | |
e1e1fdda | 123 | unsigned long addr, unsigned long end, |
da141706 LA |
124 | phys_addr_t phys, pgprot_t prot, |
125 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
126 | { |
127 | pmd_t *pmd; | |
128 | unsigned long next; | |
129 | ||
130 | /* | |
131 | * Check for initial section mappings in the pgd/pud and remove them. | |
132 | */ | |
a1c76574 | 133 | if (pud_none(*pud) || pud_sect(*pud)) { |
da141706 LA |
134 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
135 | if (pud_sect(*pud)) { | |
136 | /* | |
137 | * need to have the 1G of mappings continue to be | |
138 | * present | |
139 | */ | |
140 | split_pud(pud, pmd); | |
141 | } | |
e1e1fdda | 142 | pud_populate(mm, pud, pmd); |
da141706 | 143 | flush_tlb_all(); |
c1cc1552 | 144 | } |
a1c76574 | 145 | BUG_ON(pud_bad(*pud)); |
c1cc1552 CM |
146 | |
147 | pmd = pmd_offset(pud, addr); | |
148 | do { | |
149 | next = pmd_addr_end(addr, end); | |
150 | /* try section mapping first */ | |
a55f9929 CM |
151 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
152 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
153 | set_pmd(pmd, __pmd(phys | |
154 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
155 | /* |
156 | * Check for previous table entries created during | |
157 | * boot (__create_page_tables) and flush them. | |
158 | */ | |
523d6e9f | 159 | if (!pmd_none(old_pmd)) { |
a55f9929 | 160 | flush_tlb_all(); |
523d6e9f | 161 | if (pmd_table(old_pmd)) { |
162 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); | |
41089357 CM |
163 | if (!WARN_ON_ONCE(slab_is_available())) |
164 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 165 | } |
166 | } | |
a55f9929 | 167 | } else { |
d7ecbddf | 168 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
da141706 | 169 | prot, alloc); |
a55f9929 | 170 | } |
c1cc1552 CM |
171 | phys += next - addr; |
172 | } while (pmd++, addr = next, addr != end); | |
173 | } | |
174 | ||
da141706 LA |
175 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
176 | unsigned long phys) | |
177 | { | |
178 | if (PAGE_SHIFT != 12) | |
179 | return false; | |
180 | ||
181 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
182 | return false; | |
183 | ||
184 | return true; | |
185 | } | |
186 | ||
187 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, | |
e1e1fdda | 188 | unsigned long addr, unsigned long end, |
da141706 LA |
189 | phys_addr_t phys, pgprot_t prot, |
190 | void *(*alloc)(unsigned long size)) | |
c1cc1552 | 191 | { |
c79b954b | 192 | pud_t *pud; |
c1cc1552 CM |
193 | unsigned long next; |
194 | ||
c79b954b | 195 | if (pgd_none(*pgd)) { |
da141706 | 196 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
e1e1fdda | 197 | pgd_populate(mm, pgd, pud); |
c79b954b JL |
198 | } |
199 | BUG_ON(pgd_bad(*pgd)); | |
200 | ||
201 | pud = pud_offset(pgd, addr); | |
c1cc1552 CM |
202 | do { |
203 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
204 | |
205 | /* | |
206 | * For 4K granule only, attempt to put down a 1GB block | |
207 | */ | |
da141706 | 208 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 209 | pud_t old_pud = *pud; |
8ce837ce AB |
210 | set_pud(pud, __pud(phys | |
211 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
212 | |
213 | /* | |
214 | * If we have an old value for a pud, it will | |
215 | * be pointing to a pmd table that we no longer | |
216 | * need (from swapper_pg_dir). | |
217 | * | |
218 | * Look up the old pmd table and free it. | |
219 | */ | |
220 | if (!pud_none(old_pud)) { | |
206a2a73 | 221 | flush_tlb_all(); |
523d6e9f | 222 | if (pud_table(old_pud)) { |
223 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); | |
41089357 CM |
224 | if (!WARN_ON_ONCE(slab_is_available())) |
225 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 226 | } |
206a2a73 SC |
227 | } |
228 | } else { | |
da141706 | 229 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
206a2a73 | 230 | } |
c1cc1552 CM |
231 | phys += next - addr; |
232 | } while (pud++, addr = next, addr != end); | |
233 | } | |
234 | ||
235 | /* | |
236 | * Create the page directory entries and any necessary page tables for the | |
237 | * mapping specified by 'md'. | |
238 | */ | |
da141706 | 239 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
e1e1fdda | 240 | phys_addr_t phys, unsigned long virt, |
da141706 LA |
241 | phys_addr_t size, pgprot_t prot, |
242 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
243 | { |
244 | unsigned long addr, length, end, next; | |
c1cc1552 CM |
245 | |
246 | addr = virt & PAGE_MASK; | |
247 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
248 | ||
c1cc1552 CM |
249 | end = addr + length; |
250 | do { | |
251 | next = pgd_addr_end(addr, end); | |
da141706 | 252 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
c1cc1552 CM |
253 | phys += next - addr; |
254 | } while (pgd++, addr = next, addr != end); | |
255 | } | |
256 | ||
da141706 LA |
257 | static void *late_alloc(unsigned long size) |
258 | { | |
259 | void *ptr; | |
260 | ||
261 | BUG_ON(size > PAGE_SIZE); | |
262 | ptr = (void *)__get_free_page(PGALLOC_GFP); | |
263 | BUG_ON(!ptr); | |
264 | return ptr; | |
265 | } | |
266 | ||
267 | static void __ref create_mapping(phys_addr_t phys, unsigned long virt, | |
268 | phys_addr_t size, pgprot_t prot) | |
d7ecbddf MS |
269 | { |
270 | if (virt < VMALLOC_START) { | |
271 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
272 | &phys, virt); | |
273 | return; | |
274 | } | |
e1e1fdda | 275 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
da141706 | 276 | size, prot, early_alloc); |
d7ecbddf MS |
277 | } |
278 | ||
8ce837ce AB |
279 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
280 | unsigned long virt, phys_addr_t size, | |
281 | pgprot_t prot) | |
282 | { | |
da141706 | 283 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
60305db9 | 284 | late_alloc); |
d7ecbddf MS |
285 | } |
286 | ||
da141706 LA |
287 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
288 | phys_addr_t size, pgprot_t prot) | |
289 | { | |
290 | if (virt < VMALLOC_START) { | |
291 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
292 | &phys, virt); | |
293 | return; | |
294 | } | |
295 | ||
296 | return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), | |
297 | phys, virt, size, prot, late_alloc); | |
298 | } | |
299 | ||
300 | #ifdef CONFIG_DEBUG_RODATA | |
301 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
302 | { | |
303 | /* | |
304 | * Set up the executable regions using the existing section mappings | |
305 | * for now. This will get more fine grained later once all memory | |
306 | * is mapped | |
307 | */ | |
308 | unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE); | |
309 | unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE); | |
310 | ||
311 | if (end < kernel_x_start) { | |
312 | create_mapping(start, __phys_to_virt(start), | |
313 | end - start, PAGE_KERNEL); | |
314 | } else if (start >= kernel_x_end) { | |
315 | create_mapping(start, __phys_to_virt(start), | |
316 | end - start, PAGE_KERNEL); | |
317 | } else { | |
318 | if (start < kernel_x_start) | |
319 | create_mapping(start, __phys_to_virt(start), | |
320 | kernel_x_start - start, | |
321 | PAGE_KERNEL); | |
322 | create_mapping(kernel_x_start, | |
323 | __phys_to_virt(kernel_x_start), | |
324 | kernel_x_end - kernel_x_start, | |
325 | PAGE_KERNEL_EXEC); | |
326 | if (kernel_x_end < end) | |
327 | create_mapping(kernel_x_end, | |
328 | __phys_to_virt(kernel_x_end), | |
329 | end - kernel_x_end, | |
330 | PAGE_KERNEL); | |
331 | } | |
332 | ||
333 | } | |
334 | #else | |
335 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
336 | { | |
337 | create_mapping(start, __phys_to_virt(start), end - start, | |
338 | PAGE_KERNEL_EXEC); | |
339 | } | |
340 | #endif | |
341 | ||
c1cc1552 CM |
342 | static void __init map_mem(void) |
343 | { | |
344 | struct memblock_region *reg; | |
e25208f7 | 345 | phys_addr_t limit; |
c1cc1552 | 346 | |
f6bc87c3 SC |
347 | /* |
348 | * Temporarily limit the memblock range. We need to do this as | |
349 | * create_mapping requires puds, pmds and ptes to be allocated from | |
350 | * memory addressable from the initial direct kernel mapping. | |
351 | * | |
3dec0fe4 CM |
352 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
353 | * us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from | |
354 | * PHYS_OFFSET (which must be aligned to 2MB as per | |
355 | * Documentation/arm64/booting.txt). | |
f6bc87c3 | 356 | */ |
3dec0fe4 CM |
357 | if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) |
358 | limit = PHYS_OFFSET + PMD_SIZE; | |
359 | else | |
360 | limit = PHYS_OFFSET + PUD_SIZE; | |
e25208f7 | 361 | memblock_set_current_limit(limit); |
f6bc87c3 | 362 | |
c1cc1552 CM |
363 | /* map all the memory banks */ |
364 | for_each_memblock(memory, reg) { | |
365 | phys_addr_t start = reg->base; | |
366 | phys_addr_t end = start + reg->size; | |
367 | ||
368 | if (start >= end) | |
369 | break; | |
370 | ||
e25208f7 CM |
371 | #ifndef CONFIG_ARM64_64K_PAGES |
372 | /* | |
373 | * For the first memory bank align the start address and | |
374 | * current memblock limit to prevent create_mapping() from | |
375 | * allocating pte page tables from unmapped memory. | |
376 | * When 64K pages are enabled, the pte page table for the | |
377 | * first PGDIR_SIZE is already present in swapper_pg_dir. | |
378 | */ | |
379 | if (start < limit) | |
380 | start = ALIGN(start, PMD_SIZE); | |
381 | if (end < limit) { | |
382 | limit = end & PMD_MASK; | |
383 | memblock_set_current_limit(limit); | |
384 | } | |
385 | #endif | |
da141706 | 386 | __map_memblock(start, end); |
c1cc1552 | 387 | } |
f6bc87c3 SC |
388 | |
389 | /* Limit no longer required. */ | |
390 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
c1cc1552 CM |
391 | } |
392 | ||
da141706 LA |
393 | void __init fixup_executable(void) |
394 | { | |
395 | #ifdef CONFIG_DEBUG_RODATA | |
396 | /* now that we are actually fully mapped, make the start/end more fine grained */ | |
397 | if (!IS_ALIGNED((unsigned long)_stext, SECTION_SIZE)) { | |
398 | unsigned long aligned_start = round_down(__pa(_stext), | |
399 | SECTION_SIZE); | |
400 | ||
401 | create_mapping(aligned_start, __phys_to_virt(aligned_start), | |
402 | __pa(_stext) - aligned_start, | |
403 | PAGE_KERNEL); | |
404 | } | |
405 | ||
406 | if (!IS_ALIGNED((unsigned long)__init_end, SECTION_SIZE)) { | |
407 | unsigned long aligned_end = round_up(__pa(__init_end), | |
408 | SECTION_SIZE); | |
409 | create_mapping(__pa(__init_end), (unsigned long)__init_end, | |
410 | aligned_end - __pa(__init_end), | |
411 | PAGE_KERNEL); | |
412 | } | |
413 | #endif | |
414 | } | |
415 | ||
416 | #ifdef CONFIG_DEBUG_RODATA | |
417 | void mark_rodata_ro(void) | |
418 | { | |
419 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
420 | (unsigned long)_etext - (unsigned long)_stext, | |
421 | PAGE_KERNEL_EXEC | PTE_RDONLY); | |
422 | ||
423 | } | |
424 | #endif | |
425 | ||
426 | void fixup_init(void) | |
427 | { | |
428 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
429 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
430 | PAGE_KERNEL); | |
431 | } | |
432 | ||
c1cc1552 CM |
433 | /* |
434 | * paging_init() sets up the page tables, initialises the zone memory | |
435 | * maps and sets up the zero page. | |
436 | */ | |
437 | void __init paging_init(void) | |
438 | { | |
439 | void *zero_page; | |
440 | ||
c1cc1552 | 441 | map_mem(); |
da141706 | 442 | fixup_executable(); |
c1cc1552 | 443 | |
c1cc1552 CM |
444 | /* allocate the zero page. */ |
445 | zero_page = early_alloc(PAGE_SIZE); | |
446 | ||
447 | bootmem_init(); | |
448 | ||
449 | empty_zero_page = virt_to_page(zero_page); | |
c1cc1552 CM |
450 | |
451 | /* | |
452 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
453 | * point to zero page to avoid speculatively fetching new entries. | |
454 | */ | |
455 | cpu_set_reserved_ttbr0(); | |
456 | flush_tlb_all(); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Enable the identity mapping to allow the MMU disabling. | |
461 | */ | |
462 | void setup_mm_for_reboot(void) | |
463 | { | |
464 | cpu_switch_mm(idmap_pg_dir, &init_mm); | |
465 | flush_tlb_all(); | |
466 | } | |
467 | ||
468 | /* | |
469 | * Check whether a kernel address is valid (derived from arch/x86/). | |
470 | */ | |
471 | int kern_addr_valid(unsigned long addr) | |
472 | { | |
473 | pgd_t *pgd; | |
474 | pud_t *pud; | |
475 | pmd_t *pmd; | |
476 | pte_t *pte; | |
477 | ||
478 | if ((((long)addr) >> VA_BITS) != -1UL) | |
479 | return 0; | |
480 | ||
481 | pgd = pgd_offset_k(addr); | |
482 | if (pgd_none(*pgd)) | |
483 | return 0; | |
484 | ||
485 | pud = pud_offset(pgd, addr); | |
486 | if (pud_none(*pud)) | |
487 | return 0; | |
488 | ||
206a2a73 SC |
489 | if (pud_sect(*pud)) |
490 | return pfn_valid(pud_pfn(*pud)); | |
491 | ||
c1cc1552 CM |
492 | pmd = pmd_offset(pud, addr); |
493 | if (pmd_none(*pmd)) | |
494 | return 0; | |
495 | ||
da6e4cb6 DA |
496 | if (pmd_sect(*pmd)) |
497 | return pfn_valid(pmd_pfn(*pmd)); | |
498 | ||
c1cc1552 CM |
499 | pte = pte_offset_kernel(pmd, addr); |
500 | if (pte_none(*pte)) | |
501 | return 0; | |
502 | ||
503 | return pfn_valid(pte_pfn(*pte)); | |
504 | } | |
505 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
506 | #ifdef CONFIG_ARM64_64K_PAGES | |
0aad818b | 507 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 508 | { |
0aad818b | 509 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 CM |
510 | } |
511 | #else /* !CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 512 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 513 | { |
0aad818b | 514 | unsigned long addr = start; |
c1cc1552 CM |
515 | unsigned long next; |
516 | pgd_t *pgd; | |
517 | pud_t *pud; | |
518 | pmd_t *pmd; | |
519 | ||
520 | do { | |
521 | next = pmd_addr_end(addr, end); | |
522 | ||
523 | pgd = vmemmap_pgd_populate(addr, node); | |
524 | if (!pgd) | |
525 | return -ENOMEM; | |
526 | ||
527 | pud = vmemmap_pud_populate(pgd, addr, node); | |
528 | if (!pud) | |
529 | return -ENOMEM; | |
530 | ||
531 | pmd = pmd_offset(pud, addr); | |
532 | if (pmd_none(*pmd)) { | |
533 | void *p = NULL; | |
534 | ||
535 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
536 | if (!p) | |
537 | return -ENOMEM; | |
538 | ||
a501e324 | 539 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
540 | } else |
541 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
542 | } while (addr = next, addr != end); | |
543 | ||
544 | return 0; | |
545 | } | |
546 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 547 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
548 | { |
549 | } | |
c1cc1552 | 550 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
551 | |
552 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
553 | #if CONFIG_ARM64_PGTABLE_LEVELS > 2 | |
554 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; | |
555 | #endif | |
556 | #if CONFIG_ARM64_PGTABLE_LEVELS > 3 | |
557 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; | |
558 | #endif | |
559 | ||
560 | static inline pud_t * fixmap_pud(unsigned long addr) | |
561 | { | |
562 | pgd_t *pgd = pgd_offset_k(addr); | |
563 | ||
564 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
565 | ||
566 | return pud_offset(pgd, addr); | |
567 | } | |
568 | ||
569 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
570 | { | |
571 | pud_t *pud = fixmap_pud(addr); | |
572 | ||
573 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
574 | ||
575 | return pmd_offset(pud, addr); | |
576 | } | |
577 | ||
578 | static inline pte_t * fixmap_pte(unsigned long addr) | |
579 | { | |
580 | pmd_t *pmd = fixmap_pmd(addr); | |
581 | ||
582 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
583 | ||
584 | return pte_offset_kernel(pmd, addr); | |
585 | } | |
586 | ||
587 | void __init early_fixmap_init(void) | |
588 | { | |
589 | pgd_t *pgd; | |
590 | pud_t *pud; | |
591 | pmd_t *pmd; | |
592 | unsigned long addr = FIXADDR_START; | |
593 | ||
594 | pgd = pgd_offset_k(addr); | |
595 | pgd_populate(&init_mm, pgd, bm_pud); | |
596 | pud = pud_offset(pgd, addr); | |
597 | pud_populate(&init_mm, pud, bm_pmd); | |
598 | pmd = pmd_offset(pud, addr); | |
599 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
600 | ||
601 | /* | |
602 | * The boot-ioremap range spans multiple pmds, for which | |
603 | * we are not preparted: | |
604 | */ | |
605 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
606 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
607 | ||
608 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
609 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
610 | WARN_ON(1); | |
611 | pr_warn("pmd %p != %p, %p\n", | |
612 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
613 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
614 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
615 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
616 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
617 | fix_to_virt(FIX_BTMAP_END)); | |
618 | ||
619 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
620 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
621 | } | |
622 | } | |
623 | ||
624 | void __set_fixmap(enum fixed_addresses idx, | |
625 | phys_addr_t phys, pgprot_t flags) | |
626 | { | |
627 | unsigned long addr = __fix_to_virt(idx); | |
628 | pte_t *pte; | |
629 | ||
630 | if (idx >= __end_of_fixed_addresses) { | |
631 | BUG(); | |
632 | return; | |
633 | } | |
634 | ||
635 | pte = fixmap_pte(addr); | |
636 | ||
637 | if (pgprot_val(flags)) { | |
638 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
639 | } else { | |
640 | pte_clear(&init_mm, addr, pte); | |
641 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
642 | } | |
643 | } |