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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> |
c1cc1552 CM |
29 | |
30 | #include <asm/cputype.h> | |
af86e597 | 31 | #include <asm/fixmap.h> |
c1cc1552 CM |
32 | #include <asm/sections.h> |
33 | #include <asm/setup.h> | |
34 | #include <asm/sizes.h> | |
35 | #include <asm/tlb.h> | |
c79b954b | 36 | #include <asm/memblock.h> |
c1cc1552 CM |
37 | #include <asm/mmu_context.h> |
38 | ||
39 | #include "mm.h" | |
40 | ||
41 | /* | |
42 | * Empty_zero_page is a special page that is used for zero-initialized data | |
43 | * and COW. | |
44 | */ | |
45 | struct page *empty_zero_page; | |
46 | EXPORT_SYMBOL(empty_zero_page); | |
47 | ||
c1cc1552 CM |
48 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
49 | unsigned long size, pgprot_t vma_prot) | |
50 | { | |
51 | if (!pfn_valid(pfn)) | |
52 | return pgprot_noncached(vma_prot); | |
53 | else if (file->f_flags & O_SYNC) | |
54 | return pgprot_writecombine(vma_prot); | |
55 | return vma_prot; | |
56 | } | |
57 | EXPORT_SYMBOL(phys_mem_access_prot); | |
58 | ||
59 | static void __init *early_alloc(unsigned long sz) | |
60 | { | |
61 | void *ptr = __va(memblock_alloc(sz, sz)); | |
62 | memset(ptr, 0, sz); | |
63 | return ptr; | |
64 | } | |
65 | ||
66 | static void __init alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
d7ecbddf MS |
67 | unsigned long end, unsigned long pfn, |
68 | pgprot_t prot) | |
c1cc1552 CM |
69 | { |
70 | pte_t *pte; | |
71 | ||
72 | if (pmd_none(*pmd)) { | |
73 | pte = early_alloc(PTRS_PER_PTE * sizeof(pte_t)); | |
74 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); | |
75 | } | |
76 | BUG_ON(pmd_bad(*pmd)); | |
77 | ||
78 | pte = pte_offset_kernel(pmd, addr); | |
79 | do { | |
d7ecbddf | 80 | set_pte(pte, pfn_pte(pfn, prot)); |
c1cc1552 CM |
81 | pfn++; |
82 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
83 | } | |
84 | ||
e1e1fdda AB |
85 | static void __init alloc_init_pmd(struct mm_struct *mm, pud_t *pud, |
86 | unsigned long addr, unsigned long end, | |
8ce837ce | 87 | phys_addr_t phys, pgprot_t prot) |
c1cc1552 CM |
88 | { |
89 | pmd_t *pmd; | |
90 | unsigned long next; | |
91 | ||
92 | /* | |
93 | * Check for initial section mappings in the pgd/pud and remove them. | |
94 | */ | |
95 | if (pud_none(*pud) || pud_bad(*pud)) { | |
96 | pmd = early_alloc(PTRS_PER_PMD * sizeof(pmd_t)); | |
e1e1fdda | 97 | pud_populate(mm, pud, pmd); |
c1cc1552 CM |
98 | } |
99 | ||
100 | pmd = pmd_offset(pud, addr); | |
101 | do { | |
102 | next = pmd_addr_end(addr, end); | |
103 | /* try section mapping first */ | |
a55f9929 CM |
104 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
105 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
106 | set_pmd(pmd, __pmd(phys | |
107 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
108 | /* |
109 | * Check for previous table entries created during | |
110 | * boot (__create_page_tables) and flush them. | |
111 | */ | |
112 | if (!pmd_none(old_pmd)) | |
113 | flush_tlb_all(); | |
114 | } else { | |
d7ecbddf | 115 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
8ce837ce | 116 | prot); |
a55f9929 | 117 | } |
c1cc1552 CM |
118 | phys += next - addr; |
119 | } while (pmd++, addr = next, addr != end); | |
120 | } | |
121 | ||
e1e1fdda AB |
122 | static void __init alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, |
123 | unsigned long addr, unsigned long end, | |
8ce837ce | 124 | phys_addr_t phys, pgprot_t prot) |
c1cc1552 | 125 | { |
c79b954b | 126 | pud_t *pud; |
c1cc1552 CM |
127 | unsigned long next; |
128 | ||
c79b954b JL |
129 | if (pgd_none(*pgd)) { |
130 | pud = early_alloc(PTRS_PER_PUD * sizeof(pud_t)); | |
e1e1fdda | 131 | pgd_populate(mm, pgd, pud); |
c79b954b JL |
132 | } |
133 | BUG_ON(pgd_bad(*pgd)); | |
134 | ||
135 | pud = pud_offset(pgd, addr); | |
c1cc1552 CM |
136 | do { |
137 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
138 | |
139 | /* | |
140 | * For 4K granule only, attempt to put down a 1GB block | |
141 | */ | |
8ce837ce | 142 | if ((PAGE_SHIFT == 12) && |
206a2a73 SC |
143 | ((addr | next | phys) & ~PUD_MASK) == 0) { |
144 | pud_t old_pud = *pud; | |
8ce837ce AB |
145 | set_pud(pud, __pud(phys | |
146 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
147 | |
148 | /* | |
149 | * If we have an old value for a pud, it will | |
150 | * be pointing to a pmd table that we no longer | |
151 | * need (from swapper_pg_dir). | |
152 | * | |
153 | * Look up the old pmd table and free it. | |
154 | */ | |
155 | if (!pud_none(old_pud)) { | |
156 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); | |
157 | memblock_free(table, PAGE_SIZE); | |
158 | flush_tlb_all(); | |
159 | } | |
160 | } else { | |
8ce837ce | 161 | alloc_init_pmd(mm, pud, addr, next, phys, prot); |
206a2a73 | 162 | } |
c1cc1552 CM |
163 | phys += next - addr; |
164 | } while (pud++, addr = next, addr != end); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Create the page directory entries and any necessary page tables for the | |
169 | * mapping specified by 'md'. | |
170 | */ | |
e1e1fdda AB |
171 | static void __init __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
172 | phys_addr_t phys, unsigned long virt, | |
8ce837ce | 173 | phys_addr_t size, pgprot_t prot) |
c1cc1552 CM |
174 | { |
175 | unsigned long addr, length, end, next; | |
c1cc1552 CM |
176 | |
177 | addr = virt & PAGE_MASK; | |
178 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
179 | ||
c1cc1552 CM |
180 | end = addr + length; |
181 | do { | |
182 | next = pgd_addr_end(addr, end); | |
8ce837ce | 183 | alloc_init_pud(mm, pgd, addr, next, phys, prot); |
c1cc1552 CM |
184 | phys += next - addr; |
185 | } while (pgd++, addr = next, addr != end); | |
186 | } | |
187 | ||
d7ecbddf MS |
188 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
189 | phys_addr_t size) | |
190 | { | |
191 | if (virt < VMALLOC_START) { | |
192 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
193 | &phys, virt); | |
194 | return; | |
195 | } | |
e1e1fdda | 196 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
8ce837ce | 197 | size, PAGE_KERNEL_EXEC); |
d7ecbddf MS |
198 | } |
199 | ||
8ce837ce AB |
200 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
201 | unsigned long virt, phys_addr_t size, | |
202 | pgprot_t prot) | |
203 | { | |
204 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot); | |
d7ecbddf MS |
205 | } |
206 | ||
c1cc1552 CM |
207 | static void __init map_mem(void) |
208 | { | |
209 | struct memblock_region *reg; | |
e25208f7 | 210 | phys_addr_t limit; |
c1cc1552 | 211 | |
f6bc87c3 SC |
212 | /* |
213 | * Temporarily limit the memblock range. We need to do this as | |
214 | * create_mapping requires puds, pmds and ptes to be allocated from | |
215 | * memory addressable from the initial direct kernel mapping. | |
216 | * | |
3dec0fe4 CM |
217 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
218 | * us PUD_SIZE (4K pages) or PMD_SIZE (64K pages) memory starting from | |
219 | * PHYS_OFFSET (which must be aligned to 2MB as per | |
220 | * Documentation/arm64/booting.txt). | |
f6bc87c3 | 221 | */ |
3dec0fe4 CM |
222 | if (IS_ENABLED(CONFIG_ARM64_64K_PAGES)) |
223 | limit = PHYS_OFFSET + PMD_SIZE; | |
224 | else | |
225 | limit = PHYS_OFFSET + PUD_SIZE; | |
e25208f7 | 226 | memblock_set_current_limit(limit); |
f6bc87c3 | 227 | |
c1cc1552 CM |
228 | /* map all the memory banks */ |
229 | for_each_memblock(memory, reg) { | |
230 | phys_addr_t start = reg->base; | |
231 | phys_addr_t end = start + reg->size; | |
232 | ||
233 | if (start >= end) | |
234 | break; | |
235 | ||
e25208f7 CM |
236 | #ifndef CONFIG_ARM64_64K_PAGES |
237 | /* | |
238 | * For the first memory bank align the start address and | |
239 | * current memblock limit to prevent create_mapping() from | |
240 | * allocating pte page tables from unmapped memory. | |
241 | * When 64K pages are enabled, the pte page table for the | |
242 | * first PGDIR_SIZE is already present in swapper_pg_dir. | |
243 | */ | |
244 | if (start < limit) | |
245 | start = ALIGN(start, PMD_SIZE); | |
246 | if (end < limit) { | |
247 | limit = end & PMD_MASK; | |
248 | memblock_set_current_limit(limit); | |
249 | } | |
250 | #endif | |
251 | ||
c1cc1552 CM |
252 | create_mapping(start, __phys_to_virt(start), end - start); |
253 | } | |
f6bc87c3 SC |
254 | |
255 | /* Limit no longer required. */ | |
256 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
c1cc1552 CM |
257 | } |
258 | ||
259 | /* | |
260 | * paging_init() sets up the page tables, initialises the zone memory | |
261 | * maps and sets up the zero page. | |
262 | */ | |
263 | void __init paging_init(void) | |
264 | { | |
265 | void *zero_page; | |
266 | ||
c1cc1552 CM |
267 | map_mem(); |
268 | ||
269 | /* | |
270 | * Finally flush the caches and tlb to ensure that we're in a | |
271 | * consistent state. | |
272 | */ | |
273 | flush_cache_all(); | |
274 | flush_tlb_all(); | |
275 | ||
276 | /* allocate the zero page. */ | |
277 | zero_page = early_alloc(PAGE_SIZE); | |
278 | ||
279 | bootmem_init(); | |
280 | ||
281 | empty_zero_page = virt_to_page(zero_page); | |
c1cc1552 CM |
282 | |
283 | /* | |
284 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
285 | * point to zero page to avoid speculatively fetching new entries. | |
286 | */ | |
287 | cpu_set_reserved_ttbr0(); | |
288 | flush_tlb_all(); | |
289 | } | |
290 | ||
291 | /* | |
292 | * Enable the identity mapping to allow the MMU disabling. | |
293 | */ | |
294 | void setup_mm_for_reboot(void) | |
295 | { | |
296 | cpu_switch_mm(idmap_pg_dir, &init_mm); | |
297 | flush_tlb_all(); | |
298 | } | |
299 | ||
300 | /* | |
301 | * Check whether a kernel address is valid (derived from arch/x86/). | |
302 | */ | |
303 | int kern_addr_valid(unsigned long addr) | |
304 | { | |
305 | pgd_t *pgd; | |
306 | pud_t *pud; | |
307 | pmd_t *pmd; | |
308 | pte_t *pte; | |
309 | ||
310 | if ((((long)addr) >> VA_BITS) != -1UL) | |
311 | return 0; | |
312 | ||
313 | pgd = pgd_offset_k(addr); | |
314 | if (pgd_none(*pgd)) | |
315 | return 0; | |
316 | ||
317 | pud = pud_offset(pgd, addr); | |
318 | if (pud_none(*pud)) | |
319 | return 0; | |
320 | ||
206a2a73 SC |
321 | if (pud_sect(*pud)) |
322 | return pfn_valid(pud_pfn(*pud)); | |
323 | ||
c1cc1552 CM |
324 | pmd = pmd_offset(pud, addr); |
325 | if (pmd_none(*pmd)) | |
326 | return 0; | |
327 | ||
da6e4cb6 DA |
328 | if (pmd_sect(*pmd)) |
329 | return pfn_valid(pmd_pfn(*pmd)); | |
330 | ||
c1cc1552 CM |
331 | pte = pte_offset_kernel(pmd, addr); |
332 | if (pte_none(*pte)) | |
333 | return 0; | |
334 | ||
335 | return pfn_valid(pte_pfn(*pte)); | |
336 | } | |
337 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
338 | #ifdef CONFIG_ARM64_64K_PAGES | |
0aad818b | 339 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 340 | { |
0aad818b | 341 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 CM |
342 | } |
343 | #else /* !CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 344 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 345 | { |
0aad818b | 346 | unsigned long addr = start; |
c1cc1552 CM |
347 | unsigned long next; |
348 | pgd_t *pgd; | |
349 | pud_t *pud; | |
350 | pmd_t *pmd; | |
351 | ||
352 | do { | |
353 | next = pmd_addr_end(addr, end); | |
354 | ||
355 | pgd = vmemmap_pgd_populate(addr, node); | |
356 | if (!pgd) | |
357 | return -ENOMEM; | |
358 | ||
359 | pud = vmemmap_pud_populate(pgd, addr, node); | |
360 | if (!pud) | |
361 | return -ENOMEM; | |
362 | ||
363 | pmd = pmd_offset(pud, addr); | |
364 | if (pmd_none(*pmd)) { | |
365 | void *p = NULL; | |
366 | ||
367 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
368 | if (!p) | |
369 | return -ENOMEM; | |
370 | ||
a501e324 | 371 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
372 | } else |
373 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
374 | } while (addr = next, addr != end); | |
375 | ||
376 | return 0; | |
377 | } | |
378 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 379 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
380 | { |
381 | } | |
c1cc1552 | 382 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
383 | |
384 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
385 | #if CONFIG_ARM64_PGTABLE_LEVELS > 2 | |
386 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; | |
387 | #endif | |
388 | #if CONFIG_ARM64_PGTABLE_LEVELS > 3 | |
389 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; | |
390 | #endif | |
391 | ||
392 | static inline pud_t * fixmap_pud(unsigned long addr) | |
393 | { | |
394 | pgd_t *pgd = pgd_offset_k(addr); | |
395 | ||
396 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
397 | ||
398 | return pud_offset(pgd, addr); | |
399 | } | |
400 | ||
401 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
402 | { | |
403 | pud_t *pud = fixmap_pud(addr); | |
404 | ||
405 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
406 | ||
407 | return pmd_offset(pud, addr); | |
408 | } | |
409 | ||
410 | static inline pte_t * fixmap_pte(unsigned long addr) | |
411 | { | |
412 | pmd_t *pmd = fixmap_pmd(addr); | |
413 | ||
414 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
415 | ||
416 | return pte_offset_kernel(pmd, addr); | |
417 | } | |
418 | ||
419 | void __init early_fixmap_init(void) | |
420 | { | |
421 | pgd_t *pgd; | |
422 | pud_t *pud; | |
423 | pmd_t *pmd; | |
424 | unsigned long addr = FIXADDR_START; | |
425 | ||
426 | pgd = pgd_offset_k(addr); | |
427 | pgd_populate(&init_mm, pgd, bm_pud); | |
428 | pud = pud_offset(pgd, addr); | |
429 | pud_populate(&init_mm, pud, bm_pmd); | |
430 | pmd = pmd_offset(pud, addr); | |
431 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
432 | ||
433 | /* | |
434 | * The boot-ioremap range spans multiple pmds, for which | |
435 | * we are not preparted: | |
436 | */ | |
437 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
438 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
439 | ||
440 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
441 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
442 | WARN_ON(1); | |
443 | pr_warn("pmd %p != %p, %p\n", | |
444 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
445 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
446 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
447 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
448 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
449 | fix_to_virt(FIX_BTMAP_END)); | |
450 | ||
451 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
452 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
453 | } | |
454 | } | |
455 | ||
456 | void __set_fixmap(enum fixed_addresses idx, | |
457 | phys_addr_t phys, pgprot_t flags) | |
458 | { | |
459 | unsigned long addr = __fix_to_virt(idx); | |
460 | pte_t *pte; | |
461 | ||
462 | if (idx >= __end_of_fixed_addresses) { | |
463 | BUG(); | |
464 | return; | |
465 | } | |
466 | ||
467 | pte = fixmap_pte(addr); | |
468 | ||
469 | if (pgprot_val(flags)) { | |
470 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
471 | } else { | |
472 | pte_clear(&init_mm, addr, pte); | |
473 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
474 | } | |
475 | } |