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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> |
b433dce0 | 35 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
36 | #include <asm/sections.h> |
37 | #include <asm/setup.h> | |
38 | #include <asm/sizes.h> | |
39 | #include <asm/tlb.h> | |
c79b954b | 40 | #include <asm/memblock.h> |
c1cc1552 CM |
41 | #include <asm/mmu_context.h> |
42 | ||
43 | #include "mm.h" | |
44 | ||
dd006da2 AB |
45 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
46 | ||
c1cc1552 CM |
47 | /* |
48 | * Empty_zero_page is a special page that is used for zero-initialized data | |
49 | * and COW. | |
50 | */ | |
51 | struct page *empty_zero_page; | |
52 | EXPORT_SYMBOL(empty_zero_page); | |
53 | ||
c1cc1552 CM |
54 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
55 | unsigned long size, pgprot_t vma_prot) | |
56 | { | |
57 | if (!pfn_valid(pfn)) | |
58 | return pgprot_noncached(vma_prot); | |
59 | else if (file->f_flags & O_SYNC) | |
60 | return pgprot_writecombine(vma_prot); | |
61 | return vma_prot; | |
62 | } | |
63 | EXPORT_SYMBOL(phys_mem_access_prot); | |
64 | ||
65 | static void __init *early_alloc(unsigned long sz) | |
66 | { | |
67 | void *ptr = __va(memblock_alloc(sz, sz)); | |
da141706 | 68 | BUG_ON(!ptr); |
c1cc1552 CM |
69 | memset(ptr, 0, sz); |
70 | return ptr; | |
71 | } | |
72 | ||
da141706 LA |
73 | /* |
74 | * remap a PMD into pages | |
75 | */ | |
76 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
77 | { | |
78 | unsigned long pfn = pmd_pfn(*pmd); | |
79 | int i = 0; | |
80 | ||
81 | do { | |
82 | /* | |
83 | * Need to have the least restrictive permissions available | |
348a65cd JL |
84 | * permissions will be fixed up later. Default the new page |
85 | * range as contiguous ptes. | |
da141706 | 86 | */ |
348a65cd | 87 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC_CONT)); |
da141706 LA |
88 | pfn++; |
89 | } while (pte++, i++, i < PTRS_PER_PTE); | |
90 | } | |
91 | ||
348a65cd JL |
92 | /* |
93 | * Given a PTE with the CONT bit set, determine where the CONT range | |
94 | * starts, and clear the entire range of PTE CONT bits. | |
95 | */ | |
96 | static void clear_cont_pte_range(pte_t *pte, unsigned long addr) | |
97 | { | |
98 | int i; | |
99 | ||
100 | pte -= CONT_RANGE_OFFSET(addr); | |
101 | for (i = 0; i < CONT_PTES; i++) { | |
102 | set_pte(pte, pte_mknoncont(*pte)); | |
103 | pte++; | |
104 | } | |
105 | flush_tlb_all(); | |
106 | } | |
107 | ||
108 | /* | |
109 | * Given a range of PTEs set the pfn and provided page protection flags | |
110 | */ | |
111 | static void __populate_init_pte(pte_t *pte, unsigned long addr, | |
112 | unsigned long end, phys_addr_t phys, | |
113 | pgprot_t prot) | |
114 | { | |
115 | unsigned long pfn = __phys_to_pfn(phys); | |
116 | ||
117 | do { | |
118 | /* clear all the bits except the pfn, then apply the prot */ | |
119 | set_pte(pte, pfn_pte(pfn, prot)); | |
120 | pte++; | |
121 | pfn++; | |
122 | addr += PAGE_SIZE; | |
123 | } while (addr != end); | |
124 | } | |
125 | ||
da141706 | 126 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
348a65cd | 127 | unsigned long end, phys_addr_t phys, |
da141706 LA |
128 | pgprot_t prot, |
129 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
130 | { |
131 | pte_t *pte; | |
348a65cd | 132 | unsigned long next; |
c1cc1552 | 133 | |
a1c76574 | 134 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
da141706 LA |
135 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
136 | if (pmd_sect(*pmd)) | |
137 | split_pmd(pmd, pte); | |
c1cc1552 | 138 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
da141706 | 139 | flush_tlb_all(); |
c1cc1552 | 140 | } |
a1c76574 | 141 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 CM |
142 | |
143 | pte = pte_offset_kernel(pmd, addr); | |
144 | do { | |
348a65cd JL |
145 | next = min(end, (addr + CONT_SIZE) & CONT_MASK); |
146 | if (((addr | next | phys) & ~CONT_MASK) == 0) { | |
147 | /* a block of CONT_PTES */ | |
148 | __populate_init_pte(pte, addr, next, phys, | |
149 | prot | __pgprot(PTE_CONT)); | |
150 | } else { | |
151 | /* | |
152 | * If the range being split is already inside of a | |
153 | * contiguous range but this PTE isn't going to be | |
154 | * contiguous, then we want to unmark the adjacent | |
155 | * ranges, then update the portion of the range we | |
156 | * are interrested in. | |
157 | */ | |
158 | clear_cont_pte_range(pte, addr); | |
159 | __populate_init_pte(pte, addr, next, phys, prot); | |
160 | } | |
161 | ||
162 | pte += (next - addr) >> PAGE_SHIFT; | |
163 | phys += next - addr; | |
164 | addr = next; | |
165 | } while (addr != end); | |
c1cc1552 CM |
166 | } |
167 | ||
da141706 LA |
168 | void split_pud(pud_t *old_pud, pmd_t *pmd) |
169 | { | |
170 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
171 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
172 | int i = 0; | |
173 | ||
174 | do { | |
1e43ba9c | 175 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
da141706 LA |
176 | addr += PMD_SIZE; |
177 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
178 | } | |
179 | ||
180 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, | |
e1e1fdda | 181 | unsigned long addr, unsigned long end, |
da141706 LA |
182 | phys_addr_t phys, pgprot_t prot, |
183 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
184 | { |
185 | pmd_t *pmd; | |
186 | unsigned long next; | |
187 | ||
188 | /* | |
189 | * Check for initial section mappings in the pgd/pud and remove them. | |
190 | */ | |
a1c76574 | 191 | if (pud_none(*pud) || pud_sect(*pud)) { |
da141706 LA |
192 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
193 | if (pud_sect(*pud)) { | |
194 | /* | |
195 | * need to have the 1G of mappings continue to be | |
196 | * present | |
197 | */ | |
198 | split_pud(pud, pmd); | |
199 | } | |
e1e1fdda | 200 | pud_populate(mm, pud, pmd); |
da141706 | 201 | flush_tlb_all(); |
c1cc1552 | 202 | } |
a1c76574 | 203 | BUG_ON(pud_bad(*pud)); |
c1cc1552 CM |
204 | |
205 | pmd = pmd_offset(pud, addr); | |
206 | do { | |
207 | next = pmd_addr_end(addr, end); | |
208 | /* try section mapping first */ | |
a55f9929 CM |
209 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
210 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
211 | set_pmd(pmd, __pmd(phys | |
212 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
213 | /* |
214 | * Check for previous table entries created during | |
215 | * boot (__create_page_tables) and flush them. | |
216 | */ | |
523d6e9f | 217 | if (!pmd_none(old_pmd)) { |
a55f9929 | 218 | flush_tlb_all(); |
523d6e9f | 219 | if (pmd_table(old_pmd)) { |
220 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); | |
41089357 CM |
221 | if (!WARN_ON_ONCE(slab_is_available())) |
222 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 223 | } |
224 | } | |
a55f9929 | 225 | } else { |
348a65cd | 226 | alloc_init_pte(pmd, addr, next, phys, prot, alloc); |
a55f9929 | 227 | } |
c1cc1552 CM |
228 | phys += next - addr; |
229 | } while (pmd++, addr = next, addr != end); | |
230 | } | |
231 | ||
da141706 LA |
232 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
233 | unsigned long phys) | |
234 | { | |
235 | if (PAGE_SHIFT != 12) | |
236 | return false; | |
237 | ||
238 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
239 | return false; | |
240 | ||
241 | return true; | |
242 | } | |
243 | ||
244 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, | |
e1e1fdda | 245 | unsigned long addr, unsigned long end, |
da141706 LA |
246 | phys_addr_t phys, pgprot_t prot, |
247 | void *(*alloc)(unsigned long size)) | |
c1cc1552 | 248 | { |
c79b954b | 249 | pud_t *pud; |
c1cc1552 CM |
250 | unsigned long next; |
251 | ||
c79b954b | 252 | if (pgd_none(*pgd)) { |
da141706 | 253 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
e1e1fdda | 254 | pgd_populate(mm, pgd, pud); |
c79b954b JL |
255 | } |
256 | BUG_ON(pgd_bad(*pgd)); | |
257 | ||
258 | pud = pud_offset(pgd, addr); | |
c1cc1552 CM |
259 | do { |
260 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
261 | |
262 | /* | |
263 | * For 4K granule only, attempt to put down a 1GB block | |
264 | */ | |
da141706 | 265 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 266 | pud_t old_pud = *pud; |
8ce837ce AB |
267 | set_pud(pud, __pud(phys | |
268 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
269 | |
270 | /* | |
271 | * If we have an old value for a pud, it will | |
272 | * be pointing to a pmd table that we no longer | |
273 | * need (from swapper_pg_dir). | |
274 | * | |
275 | * Look up the old pmd table and free it. | |
276 | */ | |
277 | if (!pud_none(old_pud)) { | |
206a2a73 | 278 | flush_tlb_all(); |
523d6e9f | 279 | if (pud_table(old_pud)) { |
280 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); | |
41089357 CM |
281 | if (!WARN_ON_ONCE(slab_is_available())) |
282 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 283 | } |
206a2a73 SC |
284 | } |
285 | } else { | |
da141706 | 286 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
206a2a73 | 287 | } |
c1cc1552 CM |
288 | phys += next - addr; |
289 | } while (pud++, addr = next, addr != end); | |
290 | } | |
291 | ||
292 | /* | |
293 | * Create the page directory entries and any necessary page tables for the | |
294 | * mapping specified by 'md'. | |
295 | */ | |
da141706 | 296 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
e1e1fdda | 297 | phys_addr_t phys, unsigned long virt, |
da141706 LA |
298 | phys_addr_t size, pgprot_t prot, |
299 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
300 | { |
301 | unsigned long addr, length, end, next; | |
c1cc1552 CM |
302 | |
303 | addr = virt & PAGE_MASK; | |
304 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
305 | ||
c1cc1552 CM |
306 | end = addr + length; |
307 | do { | |
308 | next = pgd_addr_end(addr, end); | |
da141706 | 309 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
c1cc1552 CM |
310 | phys += next - addr; |
311 | } while (pgd++, addr = next, addr != end); | |
312 | } | |
313 | ||
da141706 LA |
314 | static void *late_alloc(unsigned long size) |
315 | { | |
316 | void *ptr; | |
317 | ||
318 | BUG_ON(size > PAGE_SIZE); | |
319 | ptr = (void *)__get_free_page(PGALLOC_GFP); | |
320 | BUG_ON(!ptr); | |
321 | return ptr; | |
322 | } | |
323 | ||
c53e0baa | 324 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
da141706 | 325 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
326 | { |
327 | if (virt < VMALLOC_START) { | |
328 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
329 | &phys, virt); | |
330 | return; | |
331 | } | |
e1e1fdda | 332 | __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), phys, virt, |
da141706 | 333 | size, prot, early_alloc); |
d7ecbddf MS |
334 | } |
335 | ||
8ce837ce AB |
336 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
337 | unsigned long virt, phys_addr_t size, | |
338 | pgprot_t prot) | |
339 | { | |
da141706 | 340 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
60305db9 | 341 | late_alloc); |
d7ecbddf MS |
342 | } |
343 | ||
da141706 LA |
344 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
345 | phys_addr_t size, pgprot_t prot) | |
346 | { | |
347 | if (virt < VMALLOC_START) { | |
348 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
349 | &phys, virt); | |
350 | return; | |
351 | } | |
352 | ||
353 | return __create_mapping(&init_mm, pgd_offset_k(virt & PAGE_MASK), | |
354 | phys, virt, size, prot, late_alloc); | |
355 | } | |
356 | ||
357 | #ifdef CONFIG_DEBUG_RODATA | |
358 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
359 | { | |
360 | /* | |
361 | * Set up the executable regions using the existing section mappings | |
362 | * for now. This will get more fine grained later once all memory | |
363 | * is mapped | |
364 | */ | |
365 | unsigned long kernel_x_start = round_down(__pa(_stext), SECTION_SIZE); | |
366 | unsigned long kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE); | |
367 | ||
368 | if (end < kernel_x_start) { | |
369 | create_mapping(start, __phys_to_virt(start), | |
370 | end - start, PAGE_KERNEL); | |
371 | } else if (start >= kernel_x_end) { | |
372 | create_mapping(start, __phys_to_virt(start), | |
373 | end - start, PAGE_KERNEL); | |
374 | } else { | |
375 | if (start < kernel_x_start) | |
376 | create_mapping(start, __phys_to_virt(start), | |
377 | kernel_x_start - start, | |
378 | PAGE_KERNEL); | |
379 | create_mapping(kernel_x_start, | |
380 | __phys_to_virt(kernel_x_start), | |
381 | kernel_x_end - kernel_x_start, | |
382 | PAGE_KERNEL_EXEC); | |
383 | if (kernel_x_end < end) | |
384 | create_mapping(kernel_x_end, | |
385 | __phys_to_virt(kernel_x_end), | |
386 | end - kernel_x_end, | |
387 | PAGE_KERNEL); | |
388 | } | |
389 | ||
390 | } | |
391 | #else | |
392 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
393 | { | |
394 | create_mapping(start, __phys_to_virt(start), end - start, | |
395 | PAGE_KERNEL_EXEC); | |
396 | } | |
397 | #endif | |
398 | ||
c1cc1552 CM |
399 | static void __init map_mem(void) |
400 | { | |
401 | struct memblock_region *reg; | |
e25208f7 | 402 | phys_addr_t limit; |
c1cc1552 | 403 | |
f6bc87c3 SC |
404 | /* |
405 | * Temporarily limit the memblock range. We need to do this as | |
406 | * create_mapping requires puds, pmds and ptes to be allocated from | |
407 | * memory addressable from the initial direct kernel mapping. | |
408 | * | |
3dec0fe4 | 409 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
b433dce0 SP |
410 | * us PUD_SIZE (with SECTION maps) or PMD_SIZE (without SECTION maps, |
411 | * memory starting from PHYS_OFFSET (which must be aligned to 2MB as | |
412 | * per Documentation/arm64/booting.txt). | |
f6bc87c3 | 413 | */ |
b433dce0 | 414 | limit = PHYS_OFFSET + SWAPPER_INIT_MAP_SIZE; |
e25208f7 | 415 | memblock_set_current_limit(limit); |
f6bc87c3 | 416 | |
c1cc1552 CM |
417 | /* map all the memory banks */ |
418 | for_each_memblock(memory, reg) { | |
419 | phys_addr_t start = reg->base; | |
420 | phys_addr_t end = start + reg->size; | |
421 | ||
422 | if (start >= end) | |
423 | break; | |
424 | ||
b433dce0 SP |
425 | if (ARM64_SWAPPER_USES_SECTION_MAPS) { |
426 | /* | |
427 | * For the first memory bank align the start address and | |
428 | * current memblock limit to prevent create_mapping() from | |
429 | * allocating pte page tables from unmapped memory. With | |
430 | * the section maps, if the first block doesn't end on section | |
431 | * size boundary, create_mapping() will try to allocate a pte | |
432 | * page, which may be returned from an unmapped area. | |
433 | * When section maps are not used, the pte page table for the | |
434 | * current limit is already present in swapper_pg_dir. | |
435 | */ | |
436 | if (start < limit) | |
437 | start = ALIGN(start, SECTION_SIZE); | |
438 | if (end < limit) { | |
439 | limit = end & SECTION_MASK; | |
440 | memblock_set_current_limit(limit); | |
441 | } | |
e25208f7 | 442 | } |
da141706 | 443 | __map_memblock(start, end); |
c1cc1552 | 444 | } |
f6bc87c3 SC |
445 | |
446 | /* Limit no longer required. */ | |
447 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
c1cc1552 CM |
448 | } |
449 | ||
da141706 LA |
450 | void __init fixup_executable(void) |
451 | { | |
452 | #ifdef CONFIG_DEBUG_RODATA | |
453 | /* now that we are actually fully mapped, make the start/end more fine grained */ | |
454 | if (!IS_ALIGNED((unsigned long)_stext, SECTION_SIZE)) { | |
455 | unsigned long aligned_start = round_down(__pa(_stext), | |
456 | SECTION_SIZE); | |
457 | ||
458 | create_mapping(aligned_start, __phys_to_virt(aligned_start), | |
459 | __pa(_stext) - aligned_start, | |
460 | PAGE_KERNEL); | |
461 | } | |
462 | ||
463 | if (!IS_ALIGNED((unsigned long)__init_end, SECTION_SIZE)) { | |
464 | unsigned long aligned_end = round_up(__pa(__init_end), | |
465 | SECTION_SIZE); | |
466 | create_mapping(__pa(__init_end), (unsigned long)__init_end, | |
467 | aligned_end - __pa(__init_end), | |
468 | PAGE_KERNEL); | |
469 | } | |
470 | #endif | |
471 | } | |
472 | ||
473 | #ifdef CONFIG_DEBUG_RODATA | |
474 | void mark_rodata_ro(void) | |
475 | { | |
476 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
477 | (unsigned long)_etext - (unsigned long)_stext, | |
478 | PAGE_KERNEL_EXEC | PTE_RDONLY); | |
479 | ||
480 | } | |
481 | #endif | |
482 | ||
483 | void fixup_init(void) | |
484 | { | |
485 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
486 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
487 | PAGE_KERNEL); | |
488 | } | |
489 | ||
c1cc1552 CM |
490 | /* |
491 | * paging_init() sets up the page tables, initialises the zone memory | |
492 | * maps and sets up the zero page. | |
493 | */ | |
494 | void __init paging_init(void) | |
495 | { | |
496 | void *zero_page; | |
497 | ||
c1cc1552 | 498 | map_mem(); |
da141706 | 499 | fixup_executable(); |
c1cc1552 | 500 | |
c1cc1552 CM |
501 | /* allocate the zero page. */ |
502 | zero_page = early_alloc(PAGE_SIZE); | |
503 | ||
504 | bootmem_init(); | |
505 | ||
506 | empty_zero_page = virt_to_page(zero_page); | |
c1cc1552 CM |
507 | |
508 | /* | |
509 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
510 | * point to zero page to avoid speculatively fetching new entries. | |
511 | */ | |
512 | cpu_set_reserved_ttbr0(); | |
8e63d388 | 513 | local_flush_tlb_all(); |
dd006da2 | 514 | cpu_set_default_tcr_t0sz(); |
c1cc1552 CM |
515 | } |
516 | ||
c1cc1552 CM |
517 | /* |
518 | * Check whether a kernel address is valid (derived from arch/x86/). | |
519 | */ | |
520 | int kern_addr_valid(unsigned long addr) | |
521 | { | |
522 | pgd_t *pgd; | |
523 | pud_t *pud; | |
524 | pmd_t *pmd; | |
525 | pte_t *pte; | |
526 | ||
527 | if ((((long)addr) >> VA_BITS) != -1UL) | |
528 | return 0; | |
529 | ||
530 | pgd = pgd_offset_k(addr); | |
531 | if (pgd_none(*pgd)) | |
532 | return 0; | |
533 | ||
534 | pud = pud_offset(pgd, addr); | |
535 | if (pud_none(*pud)) | |
536 | return 0; | |
537 | ||
206a2a73 SC |
538 | if (pud_sect(*pud)) |
539 | return pfn_valid(pud_pfn(*pud)); | |
540 | ||
c1cc1552 CM |
541 | pmd = pmd_offset(pud, addr); |
542 | if (pmd_none(*pmd)) | |
543 | return 0; | |
544 | ||
da6e4cb6 DA |
545 | if (pmd_sect(*pmd)) |
546 | return pfn_valid(pmd_pfn(*pmd)); | |
547 | ||
c1cc1552 CM |
548 | pte = pte_offset_kernel(pmd, addr); |
549 | if (pte_none(*pte)) | |
550 | return 0; | |
551 | ||
552 | return pfn_valid(pte_pfn(*pte)); | |
553 | } | |
554 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 555 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 556 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 557 | { |
0aad818b | 558 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 559 | } |
b433dce0 | 560 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 561 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 562 | { |
0aad818b | 563 | unsigned long addr = start; |
c1cc1552 CM |
564 | unsigned long next; |
565 | pgd_t *pgd; | |
566 | pud_t *pud; | |
567 | pmd_t *pmd; | |
568 | ||
569 | do { | |
570 | next = pmd_addr_end(addr, end); | |
571 | ||
572 | pgd = vmemmap_pgd_populate(addr, node); | |
573 | if (!pgd) | |
574 | return -ENOMEM; | |
575 | ||
576 | pud = vmemmap_pud_populate(pgd, addr, node); | |
577 | if (!pud) | |
578 | return -ENOMEM; | |
579 | ||
580 | pmd = pmd_offset(pud, addr); | |
581 | if (pmd_none(*pmd)) { | |
582 | void *p = NULL; | |
583 | ||
584 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
585 | if (!p) | |
586 | return -ENOMEM; | |
587 | ||
a501e324 | 588 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
589 | } else |
590 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
591 | } while (addr = next, addr != end); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 596 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
597 | { |
598 | } | |
c1cc1552 | 599 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
600 | |
601 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
9f25e6ad | 602 | #if CONFIG_PGTABLE_LEVELS > 2 |
af86e597 LA |
603 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
604 | #endif | |
9f25e6ad | 605 | #if CONFIG_PGTABLE_LEVELS > 3 |
af86e597 LA |
606 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
607 | #endif | |
608 | ||
609 | static inline pud_t * fixmap_pud(unsigned long addr) | |
610 | { | |
611 | pgd_t *pgd = pgd_offset_k(addr); | |
612 | ||
613 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
614 | ||
615 | return pud_offset(pgd, addr); | |
616 | } | |
617 | ||
618 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
619 | { | |
620 | pud_t *pud = fixmap_pud(addr); | |
621 | ||
622 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
623 | ||
624 | return pmd_offset(pud, addr); | |
625 | } | |
626 | ||
627 | static inline pte_t * fixmap_pte(unsigned long addr) | |
628 | { | |
629 | pmd_t *pmd = fixmap_pmd(addr); | |
630 | ||
631 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
632 | ||
633 | return pte_offset_kernel(pmd, addr); | |
634 | } | |
635 | ||
636 | void __init early_fixmap_init(void) | |
637 | { | |
638 | pgd_t *pgd; | |
639 | pud_t *pud; | |
640 | pmd_t *pmd; | |
641 | unsigned long addr = FIXADDR_START; | |
642 | ||
643 | pgd = pgd_offset_k(addr); | |
644 | pgd_populate(&init_mm, pgd, bm_pud); | |
645 | pud = pud_offset(pgd, addr); | |
646 | pud_populate(&init_mm, pud, bm_pmd); | |
647 | pmd = pmd_offset(pud, addr); | |
648 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
649 | ||
650 | /* | |
651 | * The boot-ioremap range spans multiple pmds, for which | |
652 | * we are not preparted: | |
653 | */ | |
654 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
655 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
656 | ||
657 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
658 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
659 | WARN_ON(1); | |
660 | pr_warn("pmd %p != %p, %p\n", | |
661 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
662 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
663 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
664 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
665 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
666 | fix_to_virt(FIX_BTMAP_END)); | |
667 | ||
668 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
669 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
670 | } | |
671 | } | |
672 | ||
673 | void __set_fixmap(enum fixed_addresses idx, | |
674 | phys_addr_t phys, pgprot_t flags) | |
675 | { | |
676 | unsigned long addr = __fix_to_virt(idx); | |
677 | pte_t *pte; | |
678 | ||
b63dbef9 | 679 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
680 | |
681 | pte = fixmap_pte(addr); | |
682 | ||
683 | if (pgprot_val(flags)) { | |
684 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
685 | } else { | |
686 | pte_clear(&init_mm, addr, pte); | |
687 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
688 | } | |
689 | } | |
61bd93ce AB |
690 | |
691 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) | |
692 | { | |
693 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
694 | pgprot_t prot = PAGE_KERNEL | PTE_RDONLY; | |
b433dce0 | 695 | int size, offset; |
61bd93ce AB |
696 | void *dt_virt; |
697 | ||
698 | /* | |
699 | * Check whether the physical FDT address is set and meets the minimum | |
700 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
701 | * at least 8 bytes so that we can always access the size field of the | |
702 | * FDT header after mapping the first chunk, double check here if that | |
703 | * is indeed the case. | |
704 | */ | |
705 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
706 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
707 | return NULL; | |
708 | ||
709 | /* | |
710 | * Make sure that the FDT region can be mapped without the need to | |
711 | * allocate additional translation table pages, so that it is safe | |
712 | * to call create_mapping() this early. | |
713 | * | |
714 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
715 | * be in the same PMD as the rest of the fixmap. | |
716 | * On 4k pages, we'll use section mappings for the FDT so we only | |
717 | * have to be in the same PUD. | |
718 | */ | |
719 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
720 | ||
b433dce0 SP |
721 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
722 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 723 | |
b433dce0 | 724 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
725 | dt_virt = (void *)dt_virt_base + offset; |
726 | ||
727 | /* map the first chunk so we can read the size from the header */ | |
b433dce0 SP |
728 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
729 | SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce AB |
730 | |
731 | if (fdt_check_header(dt_virt) != 0) | |
732 | return NULL; | |
733 | ||
734 | size = fdt_totalsize(dt_virt); | |
735 | if (size > MAX_FDT_SIZE) | |
736 | return NULL; | |
737 | ||
b433dce0 SP |
738 | if (offset + size > SWAPPER_BLOCK_SIZE) |
739 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, | |
740 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); | |
61bd93ce AB |
741 | |
742 | memblock_reserve(dt_phys, size); | |
743 | ||
744 | return dt_virt; | |
745 | } |