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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 CM |
32 | |
33 | #include <asm/cputype.h> | |
af86e597 | 34 | #include <asm/fixmap.h> |
c1cc1552 CM |
35 | #include <asm/sections.h> |
36 | #include <asm/setup.h> | |
37 | #include <asm/sizes.h> | |
38 | #include <asm/tlb.h> | |
c79b954b | 39 | #include <asm/memblock.h> |
c1cc1552 CM |
40 | #include <asm/mmu_context.h> |
41 | ||
42 | #include "mm.h" | |
43 | ||
dd006da2 AB |
44 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
45 | ||
c1cc1552 CM |
46 | /* |
47 | * Empty_zero_page is a special page that is used for zero-initialized data | |
48 | * and COW. | |
49 | */ | |
50 | struct page *empty_zero_page; | |
51 | EXPORT_SYMBOL(empty_zero_page); | |
52 | ||
c1cc1552 CM |
53 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
54 | unsigned long size, pgprot_t vma_prot) | |
55 | { | |
56 | if (!pfn_valid(pfn)) | |
57 | return pgprot_noncached(vma_prot); | |
58 | else if (file->f_flags & O_SYNC) | |
59 | return pgprot_writecombine(vma_prot); | |
60 | return vma_prot; | |
61 | } | |
62 | EXPORT_SYMBOL(phys_mem_access_prot); | |
63 | ||
64 | static void __init *early_alloc(unsigned long sz) | |
65 | { | |
66 | void *ptr = __va(memblock_alloc(sz, sz)); | |
da141706 | 67 | BUG_ON(!ptr); |
c1cc1552 CM |
68 | memset(ptr, 0, sz); |
69 | return ptr; | |
70 | } | |
71 | ||
da141706 LA |
72 | /* |
73 | * remap a PMD into pages | |
74 | */ | |
75 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
76 | { | |
77 | unsigned long pfn = pmd_pfn(*pmd); | |
78 | int i = 0; | |
79 | ||
80 | do { | |
81 | /* | |
82 | * Need to have the least restrictive permissions available | |
83 | * permissions will be fixed up later | |
84 | */ | |
85 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); | |
86 | pfn++; | |
87 | } while (pte++, i++, i < PTRS_PER_PTE); | |
88 | } | |
89 | ||
90 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
d7ecbddf | 91 | unsigned long end, unsigned long pfn, |
da141706 LA |
92 | pgprot_t prot, |
93 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
94 | { |
95 | pte_t *pte; | |
96 | ||
a1c76574 | 97 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
da141706 LA |
98 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
99 | if (pmd_sect(*pmd)) | |
100 | split_pmd(pmd, pte); | |
c1cc1552 | 101 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
da141706 | 102 | flush_tlb_all(); |
c1cc1552 | 103 | } |
a1c76574 | 104 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 CM |
105 | |
106 | pte = pte_offset_kernel(pmd, addr); | |
107 | do { | |
d7ecbddf | 108 | set_pte(pte, pfn_pte(pfn, prot)); |
c1cc1552 CM |
109 | pfn++; |
110 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
111 | } | |
112 | ||
da141706 LA |
113 | void split_pud(pud_t *old_pud, pmd_t *pmd) |
114 | { | |
115 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
116 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
117 | int i = 0; | |
118 | ||
119 | do { | |
120 | set_pmd(pmd, __pmd(addr | prot)); | |
121 | addr += PMD_SIZE; | |
122 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
123 | } | |
124 | ||
125 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, | |
e1e1fdda | 126 | unsigned long addr, unsigned long end, |
da141706 LA |
127 | phys_addr_t phys, pgprot_t prot, |
128 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
129 | { |
130 | pmd_t *pmd; | |
131 | unsigned long next; | |
132 | ||
133 | /* | |
134 | * Check for initial section mappings in the pgd/pud and remove them. | |
135 | */ | |
a1c76574 | 136 | if (pud_none(*pud) || pud_sect(*pud)) { |
da141706 LA |
137 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
138 | if (pud_sect(*pud)) { | |
139 | /* | |
140 | * need to have the 1G of mappings continue to be | |
141 | * present | |
142 | */ | |
143 | split_pud(pud, pmd); | |
144 | } | |
e1e1fdda | 145 | pud_populate(mm, pud, pmd); |
da141706 | 146 | flush_tlb_all(); |
c1cc1552 | 147 | } |
a1c76574 | 148 | BUG_ON(pud_bad(*pud)); |
c1cc1552 CM |
149 | |
150 | pmd = pmd_offset(pud, addr); | |
151 | do { | |
152 | next = pmd_addr_end(addr, end); | |
153 | /* try section mapping first */ | |
a55f9929 CM |
154 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
155 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
156 | set_pmd(pmd, __pmd(phys | |
157 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
158 | /* |
159 | * Check for previous table entries created during | |
160 | * boot (__create_page_tables) and flush them. | |
161 | */ | |
523d6e9f | 162 | if (!pmd_none(old_pmd)) { |
a55f9929 | 163 | flush_tlb_all(); |
523d6e9f | 164 | if (pmd_table(old_pmd)) { |
165 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); | |
41089357 CM |
166 | if (!WARN_ON_ONCE(slab_is_available())) |
167 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 168 | } |
169 | } | |
a55f9929 | 170 | } else { |
d7ecbddf | 171 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
da141706 | 172 | prot, alloc); |
a55f9929 | 173 | } |
c1cc1552 CM |
174 | phys += next - addr; |
175 | } while (pmd++, addr = next, addr != end); | |
176 | } | |
177 | ||
da141706 LA |
178 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
179 | unsigned long phys) | |
180 | { | |
181 | if (PAGE_SHIFT != 12) | |
182 | return false; | |
183 | ||
184 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
185 | return false; | |
186 | ||
187 | return true; | |
188 | } | |
189 | ||
190 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, | |
e1e1fdda | 191 | unsigned long addr, unsigned long end, |
da141706 LA |
192 | phys_addr_t phys, pgprot_t prot, |
193 | void *(*alloc)(unsigned long size)) | |
c1cc1552 | 194 | { |
c79b954b | 195 | pud_t *pud; |
c1cc1552 CM |
196 | unsigned long next; |
197 | ||
c79b954b | 198 | if (pgd_none(*pgd)) { |
da141706 | 199 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
e1e1fdda | 200 | pgd_populate(mm, pgd, pud); |
c79b954b JL |
201 | } |
202 | BUG_ON(pgd_bad(*pgd)); | |
203 | ||
204 | pud = pud_offset(pgd, addr); | |
c1cc1552 CM |
205 | do { |
206 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
207 | |
208 | /* | |
209 | * For 4K granule only, attempt to put down a 1GB block | |
210 | */ | |
da141706 | 211 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 212 | pud_t old_pud = *pud; |
8ce837ce AB |
213 | set_pud(pud, __pud(phys | |
214 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
215 | |
216 | /* | |
217 | * If we have an old value for a pud, it will | |
218 | * be pointing to a pmd table that we no longer | |
219 | * need (from swapper_pg_dir). | |
220 | * | |
221 | * Look up the old pmd table and free it. | |
222 | */ | |
223 | if (!pud_none(old_pud)) { | |
206a2a73 | 224 | flush_tlb_all(); |
523d6e9f | 225 | if (pud_table(old_pud)) { |
226 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); | |
41089357 CM |
227 | if (!WARN_ON_ONCE(slab_is_available())) |
228 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 229 | } |
206a2a73 SC |
230 | } |
231 | } else { | |
da141706 | 232 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
206a2a73 | 233 | } |
c1cc1552 CM |
234 | phys += next - addr; |
235 | } while (pud++, addr = next, addr != end); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Create the page directory entries and any necessary page tables for the | |
240 | * mapping specified by 'md'. | |
241 | */ | |
da141706 | 242 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
e1e1fdda | 243 | phys_addr_t phys, unsigned long virt, |
da141706 LA |
244 | phys_addr_t size, pgprot_t prot, |
245 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
246 | { |
247 | unsigned long addr, length, end, next; | |
c1cc1552 CM |
248 | |
249 | addr = virt & PAGE_MASK; | |
250 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
251 | ||
c1cc1552 CM |
252 | end = addr + length; |
253 | do { | |
254 | next = pgd_addr_end(addr, end); | |
da141706 | 255 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
c1cc1552 CM |
256 | phys += next - addr; |
257 | } while (pgd++, addr = next, addr != end); | |
258 | } | |
259 | ||
da141706 LA |
260 | static void *late_alloc(unsigned long size) |
261 | { | |
262 | void *ptr; | |
263 | ||
264 | BUG_ON(size > PAGE_SIZE); | |
265 | ptr = (void *)__get_free_page(PGALLOC_GFP); | |
266 | BUG_ON(!ptr); | |
267 | return ptr; | |
268 | } | |
269 | ||
270 | static void __ref create_mapping(phys_addr_t phys, unsigned long virt, | |
271 | phys_addr_t size, pgprot_t prot) | |
d7ecbddf MS |
272 | { |
273 | if (virt < VMALLOC_START) { | |
274 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
275 | &phys, virt); | |
276 | return; | |
277 | } | |
e1e1fdda | 278 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
da141706 | 279 | size, prot, early_alloc); |
d7ecbddf MS |
280 | } |
281 | ||
8ce837ce AB |
282 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
283 | unsigned long virt, phys_addr_t size, | |
284 | pgprot_t prot) | |
285 | { | |
da141706 | 286 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
60305db9 | 287 | late_alloc); |
d7ecbddf MS |
288 | } |
289 | ||
da141706 LA |
290 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
291 | phys_addr_t size, pgprot_t prot) | |
292 | { | |
293 | if (virt < VMALLOC_START) { | |
294 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
295 | &phys, virt); | |
296 | return; | |
297 | } | |
298 | ||
299 | return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), | |
300 | phys, virt, size, prot, late_alloc); | |
301 | } | |
302 | ||
303 | #ifdef CONFIG_DEBUG_RODATA | |
304 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
305 | { | |
306 | /* | |
307 | * Set up the executable regions using the existing section mappings | |
308 | * for now. This will get more fine grained later once all memory | |
309 | * is mapped | |
310 | */ | |
311 | unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE); | |
312 | unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE); | |
313 | ||
314 | if (end < kernel_x_start) { | |
315 | create_mapping(start, __phys_to_virt(start), | |
316 | end - start, PAGE_KERNEL); | |
317 | } else if (start >= kernel_x_end) { | |
318 | create_mapping(start, __phys_to_virt(start), | |
319 | end - start, PAGE_KERNEL); | |
320 | } else { | |
321 | if (start < kernel_x_start) | |
322 | create_mapping(start, __phys_to_virt(start), | |
323 | kernel_x_start - start, | |
324 | PAGE_KERNEL); | |
325 | create_mapping(kernel_x_start, | |
326 | __phys_to_virt(kernel_x_start), | |
327 | kernel_x_end - kernel_x_start, | |
328 | PAGE_KERNEL_EXEC); | |
329 | if (kernel_x_end < end) | |
330 | create_mapping(kernel_x_end, | |
331 | __phys_to_virt(kernel_x_end), | |
332 | end - kernel_x_end, | |
333 | PAGE_KERNEL); | |
334 | } | |
335 | ||
336 | } | |
337 | #else | |
338 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
339 | { | |
340 | create_mapping(start, __phys_to_virt(start), end - start, | |
341 | PAGE_KERNEL_EXEC); | |
342 | } | |
343 | #endif | |
344 | ||
c1cc1552 CM |
345 | static void __init map_mem(void) |
346 | { | |
347 | struct memblock_region *reg; | |
e25208f7 | 348 | phys_addr_t limit; |
c1cc1552 | 349 | |
f6bc87c3 SC |
350 | /* |
351 | * Temporarily limit the memblock range. We need to do this as | |
352 | * create_mapping requires puds, pmds and ptes to be allocated from | |
353 | * memory addressable from the initial direct kernel mapping. | |
354 | * | |
3dec0fe4 CM |
355 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
356 | * us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from | |
357 | * PHYS_OFFSET (which must be aligned to 2MB as per | |
358 | * Documentation/arm64/booting.txt). | |
f6bc87c3 | 359 | */ |
3dec0fe4 CM |
360 | if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) |
361 | limit = PHYS_OFFSET + PMD_SIZE; | |
362 | else | |
363 | limit = PHYS_OFFSET + PUD_SIZE; | |
e25208f7 | 364 | memblock_set_current_limit(limit); |
f6bc87c3 | 365 | |
c1cc1552 CM |
366 | /* map all the memory banks */ |
367 | for_each_memblock(memory, reg) { | |
368 | phys_addr_t start = reg->base; | |
369 | phys_addr_t end = start + reg->size; | |
370 | ||
371 | if (start >= end) | |
372 | break; | |
373 | ||
e25208f7 CM |
374 | #ifndef CONFIG_ARM64_64K_PAGES |
375 | /* | |
376 | * For the first memory bank align the start address and | |
377 | * current memblock limit to prevent create_mapping() from | |
378 | * allocating pte page tables from unmapped memory. | |
379 | * When 64K pages are enabled, the pte page table for the | |
380 | * first PGDIR_SIZE is already present in swapper_pg_dir. | |
381 | */ | |
382 | if (start < limit) | |
383 | start = ALIGN(start, PMD_SIZE); | |
384 | if (end < limit) { | |
385 | limit = end & PMD_MASK; | |
386 | memblock_set_current_limit(limit); | |
387 | } | |
388 | #endif | |
da141706 | 389 | __map_memblock(start, end); |
c1cc1552 | 390 | } |
f6bc87c3 SC |
391 | |
392 | /* Limit no longer required. */ | |
393 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
c1cc1552 CM |
394 | } |
395 | ||
da141706 LA |
396 | void __init fixup_executable(void) |
397 | { | |
398 | #ifdef CONFIG_DEBUG_RODATA | |
399 | /* now that we are actually fully mapped, make the start/end more fine grained */ | |
400 | if (!IS_ALIGNED((unsigned long)_stext, SECTION_SIZE)) { | |
401 | unsigned long aligned_start = round_down(__pa(_stext), | |
402 | SECTION_SIZE); | |
403 | ||
404 | create_mapping(aligned_start, __phys_to_virt(aligned_start), | |
405 | __pa(_stext) - aligned_start, | |
406 | PAGE_KERNEL); | |
407 | } | |
408 | ||
409 | if (!IS_ALIGNED((unsigned long)__init_end, SECTION_SIZE)) { | |
410 | unsigned long aligned_end = round_up(__pa(__init_end), | |
411 | SECTION_SIZE); | |
412 | create_mapping(__pa(__init_end), (unsigned long)__init_end, | |
413 | aligned_end - __pa(__init_end), | |
414 | PAGE_KERNEL); | |
415 | } | |
416 | #endif | |
417 | } | |
418 | ||
419 | #ifdef CONFIG_DEBUG_RODATA | |
420 | void mark_rodata_ro(void) | |
421 | { | |
422 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
423 | (unsigned long)_etext - (unsigned long)_stext, | |
424 | PAGE_KERNEL_EXEC | PTE_RDONLY); | |
425 | ||
426 | } | |
427 | #endif | |
428 | ||
429 | void fixup_init(void) | |
430 | { | |
431 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
432 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
433 | PAGE_KERNEL); | |
434 | } | |
435 | ||
c1cc1552 CM |
436 | /* |
437 | * paging_init() sets up the page tables, initialises the zone memory | |
438 | * maps and sets up the zero page. | |
439 | */ | |
440 | void __init paging_init(void) | |
441 | { | |
442 | void *zero_page; | |
443 | ||
c1cc1552 | 444 | map_mem(); |
da141706 | 445 | fixup_executable(); |
c1cc1552 | 446 | |
c1cc1552 CM |
447 | /* allocate the zero page. */ |
448 | zero_page = early_alloc(PAGE_SIZE); | |
449 | ||
450 | bootmem_init(); | |
451 | ||
452 | empty_zero_page = virt_to_page(zero_page); | |
c1cc1552 CM |
453 | |
454 | /* | |
455 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
456 | * point to zero page to avoid speculatively fetching new entries. | |
457 | */ | |
458 | cpu_set_reserved_ttbr0(); | |
459 | flush_tlb_all(); | |
dd006da2 | 460 | cpu_set_default_tcr_t0sz(); |
c1cc1552 CM |
461 | } |
462 | ||
463 | /* | |
464 | * Enable the identity mapping to allow the MMU disabling. | |
465 | */ | |
466 | void setup_mm_for_reboot(void) | |
467 | { | |
dd006da2 | 468 | cpu_set_reserved_ttbr0(); |
c1cc1552 | 469 | flush_tlb_all(); |
dd006da2 AB |
470 | cpu_set_idmap_tcr_t0sz(); |
471 | cpu_switch_mm(idmap_pg_dir, &init_mm); | |
c1cc1552 CM |
472 | } |
473 | ||
474 | /* | |
475 | * Check whether a kernel address is valid (derived from arch/x86/). | |
476 | */ | |
477 | int kern_addr_valid(unsigned long addr) | |
478 | { | |
479 | pgd_t *pgd; | |
480 | pud_t *pud; | |
481 | pmd_t *pmd; | |
482 | pte_t *pte; | |
483 | ||
484 | if ((((long)addr) >> VA_BITS) != -1UL) | |
485 | return 0; | |
486 | ||
487 | pgd = pgd_offset_k(addr); | |
488 | if (pgd_none(*pgd)) | |
489 | return 0; | |
490 | ||
491 | pud = pud_offset(pgd, addr); | |
492 | if (pud_none(*pud)) | |
493 | return 0; | |
494 | ||
206a2a73 SC |
495 | if (pud_sect(*pud)) |
496 | return pfn_valid(pud_pfn(*pud)); | |
497 | ||
c1cc1552 CM |
498 | pmd = pmd_offset(pud, addr); |
499 | if (pmd_none(*pmd)) | |
500 | return 0; | |
501 | ||
da6e4cb6 DA |
502 | if (pmd_sect(*pmd)) |
503 | return pfn_valid(pmd_pfn(*pmd)); | |
504 | ||
c1cc1552 CM |
505 | pte = pte_offset_kernel(pmd, addr); |
506 | if (pte_none(*pte)) | |
507 | return 0; | |
508 | ||
509 | return pfn_valid(pte_pfn(*pte)); | |
510 | } | |
511 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
512 | #ifdef CONFIG_ARM64_64K_PAGES | |
0aad818b | 513 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 514 | { |
0aad818b | 515 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 CM |
516 | } |
517 | #else /* !CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 518 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 519 | { |
0aad818b | 520 | unsigned long addr = start; |
c1cc1552 CM |
521 | unsigned long next; |
522 | pgd_t *pgd; | |
523 | pud_t *pud; | |
524 | pmd_t *pmd; | |
525 | ||
526 | do { | |
527 | next = pmd_addr_end(addr, end); | |
528 | ||
529 | pgd = vmemmap_pgd_populate(addr, node); | |
530 | if (!pgd) | |
531 | return -ENOMEM; | |
532 | ||
533 | pud = vmemmap_pud_populate(pgd, addr, node); | |
534 | if (!pud) | |
535 | return -ENOMEM; | |
536 | ||
537 | pmd = pmd_offset(pud, addr); | |
538 | if (pmd_none(*pmd)) { | |
539 | void *p = NULL; | |
540 | ||
541 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
542 | if (!p) | |
543 | return -ENOMEM; | |
544 | ||
a501e324 | 545 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
546 | } else |
547 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
548 | } while (addr = next, addr != end); | |
549 | ||
550 | return 0; | |
551 | } | |
552 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 553 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
554 | { |
555 | } | |
c1cc1552 | 556 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
557 | |
558 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
9f25e6ad | 559 | #if CONFIG_PGTABLE_LEVELS > 2 |
af86e597 LA |
560 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
561 | #endif | |
9f25e6ad | 562 | #if CONFIG_PGTABLE_LEVELS > 3 |
af86e597 LA |
563 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
564 | #endif | |
565 | ||
566 | static inline pud_t * fixmap_pud(unsigned long addr) | |
567 | { | |
568 | pgd_t *pgd = pgd_offset_k(addr); | |
569 | ||
570 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
571 | ||
572 | return pud_offset(pgd, addr); | |
573 | } | |
574 | ||
575 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
576 | { | |
577 | pud_t *pud = fixmap_pud(addr); | |
578 | ||
579 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
580 | ||
581 | return pmd_offset(pud, addr); | |
582 | } | |
583 | ||
584 | static inline pte_t * fixmap_pte(unsigned long addr) | |
585 | { | |
586 | pmd_t *pmd = fixmap_pmd(addr); | |
587 | ||
588 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
589 | ||
590 | return pte_offset_kernel(pmd, addr); | |
591 | } | |
592 | ||
593 | void __init early_fixmap_init(void) | |
594 | { | |
595 | pgd_t *pgd; | |
596 | pud_t *pud; | |
597 | pmd_t *pmd; | |
598 | unsigned long addr = FIXADDR_START; | |
599 | ||
600 | pgd = pgd_offset_k(addr); | |
601 | pgd_populate(&init_mm, pgd, bm_pud); | |
602 | pud = pud_offset(pgd, addr); | |
603 | pud_populate(&init_mm, pud, bm_pmd); | |
604 | pmd = pmd_offset(pud, addr); | |
605 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
606 | ||
607 | /* | |
608 | * The boot-ioremap range spans multiple pmds, for which | |
609 | * we are not preparted: | |
610 | */ | |
611 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
612 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
613 | ||
614 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
615 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
616 | WARN_ON(1); | |
617 | pr_warn("pmd %p != %p, %p\n", | |
618 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
619 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
620 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
621 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
622 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
623 | fix_to_virt(FIX_BTMAP_END)); | |
624 | ||
625 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
626 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
627 | } | |
628 | } | |
629 | ||
630 | void __set_fixmap(enum fixed_addresses idx, | |
631 | phys_addr_t phys, pgprot_t flags) | |
632 | { | |
633 | unsigned long addr = __fix_to_virt(idx); | |
634 | pte_t *pte; | |
635 | ||
b63dbef9 | 636 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
637 | |
638 | pte = fixmap_pte(addr); | |
639 | ||
640 | if (pgprot_val(flags)) { | |
641 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
642 | } else { | |
643 | pte_clear(&init_mm, addr, pte); | |
644 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
645 | } | |
646 | } | |
61bd93ce AB |
647 | |
648 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) | |
649 | { | |
650 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
651 | pgprot_t prot = PAGE_KERNEL | PTE_RDONLY; | |
652 | int granularity, size, offset; | |
653 | void *dt_virt; | |
654 | ||
655 | /* | |
656 | * Check whether the physical FDT address is set and meets the minimum | |
657 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
658 | * at least 8 bytes so that we can always access the size field of the | |
659 | * FDT header after mapping the first chunk, double check here if that | |
660 | * is indeed the case. | |
661 | */ | |
662 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
663 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
664 | return NULL; | |
665 | ||
666 | /* | |
667 | * Make sure that the FDT region can be mapped without the need to | |
668 | * allocate additional translation table pages, so that it is safe | |
669 | * to call create_mapping() this early. | |
670 | * | |
671 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
672 | * be in the same PMD as the rest of the fixmap. | |
673 | * On 4k pages, we'll use section mappings for the FDT so we only | |
674 | * have to be in the same PUD. | |
675 | */ | |
676 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
677 | ||
678 | if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) { | |
679 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> PMD_SHIFT != | |
680 | __fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT); | |
681 | ||
682 | granularity = PAGE_SIZE; | |
683 | } else { | |
684 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> PUD_SHIFT != | |
685 | __fix_to_virt(FIX_BTMAP_BEGIN) >> PUD_SHIFT); | |
686 | ||
687 | granularity = PMD_SIZE; | |
688 | } | |
689 | ||
690 | offset = dt_phys % granularity; | |
691 | dt_virt = (void *)dt_virt_base + offset; | |
692 | ||
693 | /* map the first chunk so we can read the size from the header */ | |
694 | create_mapping(round_down(dt_phys, granularity), dt_virt_base, | |
695 | granularity, prot); | |
696 | ||
697 | if (fdt_check_header(dt_virt) != 0) | |
698 | return NULL; | |
699 | ||
700 | size = fdt_totalsize(dt_virt); | |
701 | if (size > MAX_FDT_SIZE) | |
702 | return NULL; | |
703 | ||
704 | if (offset + size > granularity) | |
705 | create_mapping(round_down(dt_phys, granularity), dt_virt_base, | |
706 | round_up(offset + size, granularity), prot); | |
707 | ||
708 | memblock_reserve(dt_phys, size); | |
709 | ||
710 | return dt_virt; | |
711 | } |