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> |
b433dce0 | 36 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
37 | #include <asm/sections.h> |
38 | #include <asm/setup.h> | |
39 | #include <asm/sizes.h> | |
40 | #include <asm/tlb.h> | |
c79b954b | 41 | #include <asm/memblock.h> |
c1cc1552 CM |
42 | #include <asm/mmu_context.h> |
43 | ||
44 | #include "mm.h" | |
45 | ||
dd006da2 AB |
46 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
47 | ||
c1cc1552 CM |
48 | /* |
49 | * Empty_zero_page is a special page that is used for zero-initialized data | |
50 | * and COW. | |
51 | */ | |
5227cfa7 | 52 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
53 | EXPORT_SYMBOL(empty_zero_page); |
54 | ||
c1cc1552 CM |
55 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
56 | unsigned long size, pgprot_t vma_prot) | |
57 | { | |
58 | if (!pfn_valid(pfn)) | |
59 | return pgprot_noncached(vma_prot); | |
60 | else if (file->f_flags & O_SYNC) | |
61 | return pgprot_writecombine(vma_prot); | |
62 | return vma_prot; | |
63 | } | |
64 | EXPORT_SYMBOL(phys_mem_access_prot); | |
65 | ||
f4710445 | 66 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 67 | { |
7142392d SP |
68 | phys_addr_t phys; |
69 | void *ptr; | |
70 | ||
21ab99c2 | 71 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
7142392d | 72 | BUG_ON(!phys); |
f4710445 MR |
73 | |
74 | /* | |
75 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
76 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
77 | * any level of table. | |
78 | */ | |
79 | ptr = pte_set_fixmap(phys); | |
80 | ||
21ab99c2 MR |
81 | memset(ptr, 0, PAGE_SIZE); |
82 | ||
f4710445 MR |
83 | /* |
84 | * Implicit barriers also ensure the zeroed page is visible to the page | |
85 | * table walker | |
86 | */ | |
87 | pte_clear_fixmap(); | |
88 | ||
89 | return phys; | |
c1cc1552 CM |
90 | } |
91 | ||
da141706 LA |
92 | /* |
93 | * remap a PMD into pages | |
94 | */ | |
95 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
96 | { | |
97 | unsigned long pfn = pmd_pfn(*pmd); | |
98 | int i = 0; | |
99 | ||
100 | do { | |
101 | /* | |
102 | * Need to have the least restrictive permissions available | |
667c2759 | 103 | * permissions will be fixed up later |
da141706 | 104 | */ |
667c2759 | 105 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
da141706 LA |
106 | pfn++; |
107 | } while (pte++, i++, i < PTRS_PER_PTE); | |
108 | } | |
109 | ||
110 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
667c2759 | 111 | unsigned long end, unsigned long pfn, |
da141706 | 112 | pgprot_t prot, |
f4710445 | 113 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
114 | { |
115 | pte_t *pte; | |
116 | ||
a1c76574 | 117 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
f4710445 MR |
118 | phys_addr_t pte_phys = pgtable_alloc(); |
119 | pte = pte_set_fixmap(pte_phys); | |
da141706 LA |
120 | if (pmd_sect(*pmd)) |
121 | split_pmd(pmd, pte); | |
f4710445 | 122 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
da141706 | 123 | flush_tlb_all(); |
f4710445 | 124 | pte_clear_fixmap(); |
c1cc1552 | 125 | } |
a1c76574 | 126 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 127 | |
f4710445 | 128 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 129 | do { |
667c2759 CM |
130 | set_pte(pte, pfn_pte(pfn, prot)); |
131 | pfn++; | |
132 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
f4710445 MR |
133 | |
134 | pte_clear_fixmap(); | |
c1cc1552 CM |
135 | } |
136 | ||
9a17a213 | 137 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
da141706 LA |
138 | { |
139 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
140 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
141 | int i = 0; | |
142 | ||
143 | do { | |
1e43ba9c | 144 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
da141706 LA |
145 | addr += PMD_SIZE; |
146 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
147 | } | |
148 | ||
11509a30 | 149 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 150 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 151 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
152 | { |
153 | pmd_t *pmd; | |
154 | unsigned long next; | |
155 | ||
156 | /* | |
157 | * Check for initial section mappings in the pgd/pud and remove them. | |
158 | */ | |
a1c76574 | 159 | if (pud_none(*pud) || pud_sect(*pud)) { |
f4710445 MR |
160 | phys_addr_t pmd_phys = pgtable_alloc(); |
161 | pmd = pmd_set_fixmap(pmd_phys); | |
da141706 LA |
162 | if (pud_sect(*pud)) { |
163 | /* | |
164 | * need to have the 1G of mappings continue to be | |
165 | * present | |
166 | */ | |
167 | split_pud(pud, pmd); | |
168 | } | |
f4710445 | 169 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
da141706 | 170 | flush_tlb_all(); |
f4710445 | 171 | pmd_clear_fixmap(); |
c1cc1552 | 172 | } |
a1c76574 | 173 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 174 | |
f4710445 | 175 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 CM |
176 | do { |
177 | next = pmd_addr_end(addr, end); | |
178 | /* try section mapping first */ | |
a55f9929 CM |
179 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
180 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
181 | set_pmd(pmd, __pmd(phys | |
182 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
183 | /* |
184 | * Check for previous table entries created during | |
185 | * boot (__create_page_tables) and flush them. | |
186 | */ | |
523d6e9f | 187 | if (!pmd_none(old_pmd)) { |
a55f9929 | 188 | flush_tlb_all(); |
523d6e9f | 189 | if (pmd_table(old_pmd)) { |
316b39db | 190 | phys_addr_t table = pmd_page_paddr(old_pmd); |
41089357 CM |
191 | if (!WARN_ON_ONCE(slab_is_available())) |
192 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 193 | } |
194 | } | |
a55f9929 | 195 | } else { |
667c2759 | 196 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
21ab99c2 | 197 | prot, pgtable_alloc); |
a55f9929 | 198 | } |
c1cc1552 CM |
199 | phys += next - addr; |
200 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
201 | |
202 | pmd_clear_fixmap(); | |
c1cc1552 CM |
203 | } |
204 | ||
da141706 LA |
205 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
206 | unsigned long phys) | |
207 | { | |
208 | if (PAGE_SHIFT != 12) | |
209 | return false; | |
210 | ||
211 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
212 | return false; | |
213 | ||
214 | return true; | |
215 | } | |
216 | ||
11509a30 | 217 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 218 | phys_addr_t phys, pgprot_t prot, |
f4710445 | 219 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 | 220 | { |
c79b954b | 221 | pud_t *pud; |
c1cc1552 CM |
222 | unsigned long next; |
223 | ||
c79b954b | 224 | if (pgd_none(*pgd)) { |
f4710445 MR |
225 | phys_addr_t pud_phys = pgtable_alloc(); |
226 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); | |
c79b954b JL |
227 | } |
228 | BUG_ON(pgd_bad(*pgd)); | |
229 | ||
f4710445 | 230 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 CM |
231 | do { |
232 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
233 | |
234 | /* | |
235 | * For 4K granule only, attempt to put down a 1GB block | |
236 | */ | |
da141706 | 237 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 238 | pud_t old_pud = *pud; |
8ce837ce AB |
239 | set_pud(pud, __pud(phys | |
240 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
241 | |
242 | /* | |
243 | * If we have an old value for a pud, it will | |
244 | * be pointing to a pmd table that we no longer | |
245 | * need (from swapper_pg_dir). | |
246 | * | |
247 | * Look up the old pmd table and free it. | |
248 | */ | |
249 | if (!pud_none(old_pud)) { | |
206a2a73 | 250 | flush_tlb_all(); |
523d6e9f | 251 | if (pud_table(old_pud)) { |
316b39db | 252 | phys_addr_t table = pud_page_paddr(old_pud); |
41089357 CM |
253 | if (!WARN_ON_ONCE(slab_is_available())) |
254 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 255 | } |
206a2a73 SC |
256 | } |
257 | } else { | |
11509a30 | 258 | alloc_init_pmd(pud, addr, next, phys, prot, |
21ab99c2 | 259 | pgtable_alloc); |
206a2a73 | 260 | } |
c1cc1552 CM |
261 | phys += next - addr; |
262 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
263 | |
264 | pud_clear_fixmap(); | |
c1cc1552 CM |
265 | } |
266 | ||
267 | /* | |
268 | * Create the page directory entries and any necessary page tables for the | |
269 | * mapping specified by 'md'. | |
270 | */ | |
11509a30 | 271 | static void init_pgd(pgd_t *pgd, phys_addr_t phys, unsigned long virt, |
da141706 | 272 | phys_addr_t size, pgprot_t prot, |
f4710445 | 273 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
274 | { |
275 | unsigned long addr, length, end, next; | |
c1cc1552 | 276 | |
cc5d2b3b MR |
277 | /* |
278 | * If the virtual and physical address don't have the same offset | |
279 | * within a page, we cannot map the region as the caller expects. | |
280 | */ | |
281 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
282 | return; | |
283 | ||
9c4e08a3 | 284 | phys &= PAGE_MASK; |
c1cc1552 CM |
285 | addr = virt & PAGE_MASK; |
286 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
287 | ||
c1cc1552 CM |
288 | end = addr + length; |
289 | do { | |
290 | next = pgd_addr_end(addr, end); | |
11509a30 | 291 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc); |
c1cc1552 CM |
292 | phys += next - addr; |
293 | } while (pgd++, addr = next, addr != end); | |
294 | } | |
295 | ||
f4710445 | 296 | static phys_addr_t late_pgtable_alloc(void) |
da141706 | 297 | { |
21ab99c2 | 298 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
da141706 | 299 | BUG_ON(!ptr); |
21ab99c2 MR |
300 | |
301 | /* Ensure the zeroed page is visible to the page table walker */ | |
302 | dsb(ishst); | |
f4710445 | 303 | return __pa(ptr); |
da141706 LA |
304 | } |
305 | ||
11509a30 MR |
306 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
307 | unsigned long virt, phys_addr_t size, | |
308 | pgprot_t prot, | |
309 | phys_addr_t (*alloc)(void)) | |
310 | { | |
311 | init_pgd(pgd_offset_raw(pgdir, virt), phys, virt, size, prot, alloc); | |
312 | } | |
313 | ||
c53e0baa | 314 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
da141706 | 315 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
316 | { |
317 | if (virt < VMALLOC_START) { | |
318 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
319 | &phys, virt); | |
320 | return; | |
321 | } | |
11509a30 MR |
322 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
323 | early_pgtable_alloc); | |
d7ecbddf MS |
324 | } |
325 | ||
8ce837ce AB |
326 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
327 | unsigned long virt, phys_addr_t size, | |
328 | pgprot_t prot) | |
329 | { | |
11509a30 MR |
330 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
331 | late_pgtable_alloc); | |
d7ecbddf MS |
332 | } |
333 | ||
da141706 LA |
334 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
335 | phys_addr_t size, pgprot_t prot) | |
336 | { | |
337 | if (virt < VMALLOC_START) { | |
338 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
339 | &phys, virt); | |
340 | return; | |
341 | } | |
342 | ||
11509a30 MR |
343 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
344 | late_pgtable_alloc); | |
da141706 LA |
345 | } |
346 | ||
347 | #ifdef CONFIG_DEBUG_RODATA | |
348 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
349 | { | |
350 | /* | |
351 | * Set up the executable regions using the existing section mappings | |
352 | * for now. This will get more fine grained later once all memory | |
353 | * is mapped | |
354 | */ | |
4fee9f36 AB |
355 | unsigned long kernel_x_start = round_down(__pa(_stext), SWAPPER_BLOCK_SIZE); |
356 | unsigned long kernel_x_end = round_up(__pa(__init_end), SWAPPER_BLOCK_SIZE); | |
da141706 LA |
357 | |
358 | if (end < kernel_x_start) { | |
359 | create_mapping(start, __phys_to_virt(start), | |
360 | end - start, PAGE_KERNEL); | |
361 | } else if (start >= kernel_x_end) { | |
362 | create_mapping(start, __phys_to_virt(start), | |
363 | end - start, PAGE_KERNEL); | |
364 | } else { | |
365 | if (start < kernel_x_start) | |
366 | create_mapping(start, __phys_to_virt(start), | |
367 | kernel_x_start - start, | |
368 | PAGE_KERNEL); | |
369 | create_mapping(kernel_x_start, | |
370 | __phys_to_virt(kernel_x_start), | |
371 | kernel_x_end - kernel_x_start, | |
372 | PAGE_KERNEL_EXEC); | |
373 | if (kernel_x_end < end) | |
374 | create_mapping(kernel_x_end, | |
375 | __phys_to_virt(kernel_x_end), | |
376 | end - kernel_x_end, | |
377 | PAGE_KERNEL); | |
378 | } | |
379 | ||
380 | } | |
381 | #else | |
382 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
383 | { | |
384 | create_mapping(start, __phys_to_virt(start), end - start, | |
385 | PAGE_KERNEL_EXEC); | |
386 | } | |
387 | #endif | |
388 | ||
c1cc1552 CM |
389 | static void __init map_mem(void) |
390 | { | |
391 | struct memblock_region *reg; | |
f6bc87c3 | 392 | |
c1cc1552 CM |
393 | /* map all the memory banks */ |
394 | for_each_memblock(memory, reg) { | |
395 | phys_addr_t start = reg->base; | |
396 | phys_addr_t end = start + reg->size; | |
397 | ||
398 | if (start >= end) | |
399 | break; | |
68709f45 AB |
400 | if (memblock_is_nomap(reg)) |
401 | continue; | |
c1cc1552 | 402 | |
da141706 | 403 | __map_memblock(start, end); |
c1cc1552 CM |
404 | } |
405 | } | |
406 | ||
9a17a213 | 407 | static void __init fixup_executable(void) |
da141706 LA |
408 | { |
409 | #ifdef CONFIG_DEBUG_RODATA | |
410 | /* now that we are actually fully mapped, make the start/end more fine grained */ | |
4fee9f36 | 411 | if (!IS_ALIGNED((unsigned long)_stext, SWAPPER_BLOCK_SIZE)) { |
da141706 | 412 | unsigned long aligned_start = round_down(__pa(_stext), |
4fee9f36 | 413 | SWAPPER_BLOCK_SIZE); |
da141706 LA |
414 | |
415 | create_mapping(aligned_start, __phys_to_virt(aligned_start), | |
416 | __pa(_stext) - aligned_start, | |
417 | PAGE_KERNEL); | |
418 | } | |
419 | ||
4fee9f36 | 420 | if (!IS_ALIGNED((unsigned long)__init_end, SWAPPER_BLOCK_SIZE)) { |
da141706 | 421 | unsigned long aligned_end = round_up(__pa(__init_end), |
4fee9f36 | 422 | SWAPPER_BLOCK_SIZE); |
da141706 LA |
423 | create_mapping(__pa(__init_end), (unsigned long)__init_end, |
424 | aligned_end - __pa(__init_end), | |
425 | PAGE_KERNEL); | |
426 | } | |
427 | #endif | |
428 | } | |
429 | ||
430 | #ifdef CONFIG_DEBUG_RODATA | |
431 | void mark_rodata_ro(void) | |
432 | { | |
433 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
434 | (unsigned long)_etext - (unsigned long)_stext, | |
0b2aa5b8 | 435 | PAGE_KERNEL_ROX); |
da141706 LA |
436 | |
437 | } | |
438 | #endif | |
439 | ||
440 | void fixup_init(void) | |
441 | { | |
442 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
443 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
444 | PAGE_KERNEL); | |
445 | } | |
446 | ||
c1cc1552 CM |
447 | /* |
448 | * paging_init() sets up the page tables, initialises the zone memory | |
449 | * maps and sets up the zero page. | |
450 | */ | |
451 | void __init paging_init(void) | |
452 | { | |
c1cc1552 | 453 | map_mem(); |
da141706 | 454 | fixup_executable(); |
c1cc1552 | 455 | |
c1cc1552 | 456 | bootmem_init(); |
c1cc1552 CM |
457 | } |
458 | ||
c1cc1552 CM |
459 | /* |
460 | * Check whether a kernel address is valid (derived from arch/x86/). | |
461 | */ | |
462 | int kern_addr_valid(unsigned long addr) | |
463 | { | |
464 | pgd_t *pgd; | |
465 | pud_t *pud; | |
466 | pmd_t *pmd; | |
467 | pte_t *pte; | |
468 | ||
469 | if ((((long)addr) >> VA_BITS) != -1UL) | |
470 | return 0; | |
471 | ||
472 | pgd = pgd_offset_k(addr); | |
473 | if (pgd_none(*pgd)) | |
474 | return 0; | |
475 | ||
476 | pud = pud_offset(pgd, addr); | |
477 | if (pud_none(*pud)) | |
478 | return 0; | |
479 | ||
206a2a73 SC |
480 | if (pud_sect(*pud)) |
481 | return pfn_valid(pud_pfn(*pud)); | |
482 | ||
c1cc1552 CM |
483 | pmd = pmd_offset(pud, addr); |
484 | if (pmd_none(*pmd)) | |
485 | return 0; | |
486 | ||
da6e4cb6 DA |
487 | if (pmd_sect(*pmd)) |
488 | return pfn_valid(pmd_pfn(*pmd)); | |
489 | ||
c1cc1552 CM |
490 | pte = pte_offset_kernel(pmd, addr); |
491 | if (pte_none(*pte)) | |
492 | return 0; | |
493 | ||
494 | return pfn_valid(pte_pfn(*pte)); | |
495 | } | |
496 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 497 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 498 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 499 | { |
0aad818b | 500 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 501 | } |
b433dce0 | 502 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 503 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 504 | { |
0aad818b | 505 | unsigned long addr = start; |
c1cc1552 CM |
506 | unsigned long next; |
507 | pgd_t *pgd; | |
508 | pud_t *pud; | |
509 | pmd_t *pmd; | |
510 | ||
511 | do { | |
512 | next = pmd_addr_end(addr, end); | |
513 | ||
514 | pgd = vmemmap_pgd_populate(addr, node); | |
515 | if (!pgd) | |
516 | return -ENOMEM; | |
517 | ||
518 | pud = vmemmap_pud_populate(pgd, addr, node); | |
519 | if (!pud) | |
520 | return -ENOMEM; | |
521 | ||
522 | pmd = pmd_offset(pud, addr); | |
523 | if (pmd_none(*pmd)) { | |
524 | void *p = NULL; | |
525 | ||
526 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
527 | if (!p) | |
528 | return -ENOMEM; | |
529 | ||
a501e324 | 530 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
531 | } else |
532 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
533 | } while (addr = next, addr != end); | |
534 | ||
535 | return 0; | |
536 | } | |
537 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 538 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
539 | { |
540 | } | |
c1cc1552 | 541 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
542 | |
543 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
9f25e6ad | 544 | #if CONFIG_PGTABLE_LEVELS > 2 |
af86e597 LA |
545 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
546 | #endif | |
9f25e6ad | 547 | #if CONFIG_PGTABLE_LEVELS > 3 |
af86e597 LA |
548 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
549 | #endif | |
550 | ||
551 | static inline pud_t * fixmap_pud(unsigned long addr) | |
552 | { | |
553 | pgd_t *pgd = pgd_offset_k(addr); | |
554 | ||
555 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
556 | ||
557 | return pud_offset(pgd, addr); | |
558 | } | |
559 | ||
560 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
561 | { | |
562 | pud_t *pud = fixmap_pud(addr); | |
563 | ||
564 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
565 | ||
566 | return pmd_offset(pud, addr); | |
567 | } | |
568 | ||
569 | static inline pte_t * fixmap_pte(unsigned long addr) | |
570 | { | |
571 | pmd_t *pmd = fixmap_pmd(addr); | |
572 | ||
573 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
574 | ||
575 | return pte_offset_kernel(pmd, addr); | |
576 | } | |
577 | ||
578 | void __init early_fixmap_init(void) | |
579 | { | |
580 | pgd_t *pgd; | |
581 | pud_t *pud; | |
582 | pmd_t *pmd; | |
583 | unsigned long addr = FIXADDR_START; | |
584 | ||
585 | pgd = pgd_offset_k(addr); | |
586 | pgd_populate(&init_mm, pgd, bm_pud); | |
587 | pud = pud_offset(pgd, addr); | |
588 | pud_populate(&init_mm, pud, bm_pmd); | |
589 | pmd = pmd_offset(pud, addr); | |
590 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
591 | ||
592 | /* | |
593 | * The boot-ioremap range spans multiple pmds, for which | |
594 | * we are not preparted: | |
595 | */ | |
596 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
597 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
598 | ||
599 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
600 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
601 | WARN_ON(1); | |
602 | pr_warn("pmd %p != %p, %p\n", | |
603 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
604 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
605 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
606 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
607 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
608 | fix_to_virt(FIX_BTMAP_END)); | |
609 | ||
610 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
611 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
612 | } | |
613 | } | |
614 | ||
615 | void __set_fixmap(enum fixed_addresses idx, | |
616 | phys_addr_t phys, pgprot_t flags) | |
617 | { | |
618 | unsigned long addr = __fix_to_virt(idx); | |
619 | pte_t *pte; | |
620 | ||
b63dbef9 | 621 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
622 | |
623 | pte = fixmap_pte(addr); | |
624 | ||
625 | if (pgprot_val(flags)) { | |
626 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
627 | } else { | |
628 | pte_clear(&init_mm, addr, pte); | |
629 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
630 | } | |
631 | } | |
61bd93ce AB |
632 | |
633 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) | |
634 | { | |
635 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
fb226c3d | 636 | pgprot_t prot = PAGE_KERNEL_RO; |
b433dce0 | 637 | int size, offset; |
61bd93ce AB |
638 | void *dt_virt; |
639 | ||
640 | /* | |
641 | * Check whether the physical FDT address is set and meets the minimum | |
642 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
643 | * at least 8 bytes so that we can always access the size field of the | |
644 | * FDT header after mapping the first chunk, double check here if that | |
645 | * is indeed the case. | |
646 | */ | |
647 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
648 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
649 | return NULL; | |
650 | ||
651 | /* | |
652 | * Make sure that the FDT region can be mapped without the need to | |
653 | * allocate additional translation table pages, so that it is safe | |
654 | * to call create_mapping() this early. | |
655 | * | |
656 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
657 | * be in the same PMD as the rest of the fixmap. | |
658 | * On 4k pages, we'll use section mappings for the FDT so we only | |
659 | * have to be in the same PUD. | |
660 | */ | |
661 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
662 | ||
b433dce0 SP |
663 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
664 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 665 | |
b433dce0 | 666 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
667 | dt_virt = (void *)dt_virt_base + offset; |
668 | ||
669 | /* map the first chunk so we can read the size from the header */ | |
b433dce0 SP |
670 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
671 | SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce AB |
672 | |
673 | if (fdt_check_header(dt_virt) != 0) | |
674 | return NULL; | |
675 | ||
676 | size = fdt_totalsize(dt_virt); | |
677 | if (size > MAX_FDT_SIZE) | |
678 | return NULL; | |
679 | ||
b433dce0 SP |
680 | if (offset + size > SWAPPER_BLOCK_SIZE) |
681 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, | |
682 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); | |
61bd93ce AB |
683 | |
684 | memblock_reserve(dt_phys, size); | |
685 | ||
686 | return dt_virt; | |
687 | } |