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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 | { | |
7142392d SP |
67 | phys_addr_t phys; |
68 | void *ptr; | |
69 | ||
70 | phys = memblock_alloc(sz, sz); | |
71 | BUG_ON(!phys); | |
72 | ptr = __va(phys); | |
c1cc1552 CM |
73 | memset(ptr, 0, sz); |
74 | return ptr; | |
75 | } | |
76 | ||
da141706 LA |
77 | /* |
78 | * remap a PMD into pages | |
79 | */ | |
80 | static void split_pmd(pmd_t *pmd, pte_t *pte) | |
81 | { | |
82 | unsigned long pfn = pmd_pfn(*pmd); | |
83 | int i = 0; | |
84 | ||
85 | do { | |
86 | /* | |
87 | * Need to have the least restrictive permissions available | |
667c2759 | 88 | * permissions will be fixed up later |
da141706 | 89 | */ |
667c2759 | 90 | set_pte(pte, pfn_pte(pfn, PAGE_KERNEL_EXEC)); |
da141706 LA |
91 | pfn++; |
92 | } while (pte++, i++, i < PTRS_PER_PTE); | |
93 | } | |
94 | ||
95 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, | |
667c2759 | 96 | unsigned long end, unsigned long pfn, |
da141706 LA |
97 | pgprot_t prot, |
98 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
99 | { |
100 | pte_t *pte; | |
101 | ||
a1c76574 | 102 | if (pmd_none(*pmd) || pmd_sect(*pmd)) { |
da141706 LA |
103 | pte = alloc(PTRS_PER_PTE * sizeof(pte_t)); |
104 | if (pmd_sect(*pmd)) | |
105 | split_pmd(pmd, pte); | |
c1cc1552 | 106 | __pmd_populate(pmd, __pa(pte), PMD_TYPE_TABLE); |
da141706 | 107 | flush_tlb_all(); |
c1cc1552 | 108 | } |
a1c76574 | 109 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 CM |
110 | |
111 | pte = pte_offset_kernel(pmd, addr); | |
112 | do { | |
667c2759 CM |
113 | set_pte(pte, pfn_pte(pfn, prot)); |
114 | pfn++; | |
115 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
c1cc1552 CM |
116 | } |
117 | ||
9a17a213 | 118 | static void split_pud(pud_t *old_pud, pmd_t *pmd) |
da141706 LA |
119 | { |
120 | unsigned long addr = pud_pfn(*old_pud) << PAGE_SHIFT; | |
121 | pgprot_t prot = __pgprot(pud_val(*old_pud) ^ addr); | |
122 | int i = 0; | |
123 | ||
124 | do { | |
1e43ba9c | 125 | set_pmd(pmd, __pmd(addr | pgprot_val(prot))); |
da141706 LA |
126 | addr += PMD_SIZE; |
127 | } while (pmd++, i++, i < PTRS_PER_PMD); | |
128 | } | |
129 | ||
130 | static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud, | |
e1e1fdda | 131 | unsigned long addr, unsigned long end, |
da141706 LA |
132 | phys_addr_t phys, pgprot_t prot, |
133 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
134 | { |
135 | pmd_t *pmd; | |
136 | unsigned long next; | |
137 | ||
138 | /* | |
139 | * Check for initial section mappings in the pgd/pud and remove them. | |
140 | */ | |
a1c76574 | 141 | if (pud_none(*pud) || pud_sect(*pud)) { |
da141706 LA |
142 | pmd = alloc(PTRS_PER_PMD * sizeof(pmd_t)); |
143 | if (pud_sect(*pud)) { | |
144 | /* | |
145 | * need to have the 1G of mappings continue to be | |
146 | * present | |
147 | */ | |
148 | split_pud(pud, pmd); | |
149 | } | |
e1e1fdda | 150 | pud_populate(mm, pud, pmd); |
da141706 | 151 | flush_tlb_all(); |
c1cc1552 | 152 | } |
a1c76574 | 153 | BUG_ON(pud_bad(*pud)); |
c1cc1552 CM |
154 | |
155 | pmd = pmd_offset(pud, addr); | |
156 | do { | |
157 | next = pmd_addr_end(addr, end); | |
158 | /* try section mapping first */ | |
a55f9929 CM |
159 | if (((addr | next | phys) & ~SECTION_MASK) == 0) { |
160 | pmd_t old_pmd =*pmd; | |
8ce837ce AB |
161 | set_pmd(pmd, __pmd(phys | |
162 | pgprot_val(mk_sect_prot(prot)))); | |
a55f9929 CM |
163 | /* |
164 | * Check for previous table entries created during | |
165 | * boot (__create_page_tables) and flush them. | |
166 | */ | |
523d6e9f | 167 | if (!pmd_none(old_pmd)) { |
a55f9929 | 168 | flush_tlb_all(); |
523d6e9f | 169 | if (pmd_table(old_pmd)) { |
170 | phys_addr_t table = __pa(pte_offset_map(&old_pmd, 0)); | |
41089357 CM |
171 | if (!WARN_ON_ONCE(slab_is_available())) |
172 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 173 | } |
174 | } | |
a55f9929 | 175 | } else { |
667c2759 CM |
176 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
177 | prot, alloc); | |
a55f9929 | 178 | } |
c1cc1552 CM |
179 | phys += next - addr; |
180 | } while (pmd++, addr = next, addr != end); | |
181 | } | |
182 | ||
da141706 LA |
183 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
184 | unsigned long phys) | |
185 | { | |
186 | if (PAGE_SHIFT != 12) | |
187 | return false; | |
188 | ||
189 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
190 | return false; | |
191 | ||
192 | return true; | |
193 | } | |
194 | ||
195 | static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd, | |
e1e1fdda | 196 | unsigned long addr, unsigned long end, |
da141706 LA |
197 | phys_addr_t phys, pgprot_t prot, |
198 | void *(*alloc)(unsigned long size)) | |
c1cc1552 | 199 | { |
c79b954b | 200 | pud_t *pud; |
c1cc1552 CM |
201 | unsigned long next; |
202 | ||
c79b954b | 203 | if (pgd_none(*pgd)) { |
da141706 | 204 | pud = alloc(PTRS_PER_PUD * sizeof(pud_t)); |
e1e1fdda | 205 | pgd_populate(mm, pgd, pud); |
c79b954b JL |
206 | } |
207 | BUG_ON(pgd_bad(*pgd)); | |
208 | ||
209 | pud = pud_offset(pgd, addr); | |
c1cc1552 CM |
210 | do { |
211 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
212 | |
213 | /* | |
214 | * For 4K granule only, attempt to put down a 1GB block | |
215 | */ | |
da141706 | 216 | if (use_1G_block(addr, next, phys)) { |
206a2a73 | 217 | pud_t old_pud = *pud; |
8ce837ce AB |
218 | set_pud(pud, __pud(phys | |
219 | pgprot_val(mk_sect_prot(prot)))); | |
206a2a73 SC |
220 | |
221 | /* | |
222 | * If we have an old value for a pud, it will | |
223 | * be pointing to a pmd table that we no longer | |
224 | * need (from swapper_pg_dir). | |
225 | * | |
226 | * Look up the old pmd table and free it. | |
227 | */ | |
228 | if (!pud_none(old_pud)) { | |
206a2a73 | 229 | flush_tlb_all(); |
523d6e9f | 230 | if (pud_table(old_pud)) { |
231 | phys_addr_t table = __pa(pmd_offset(&old_pud, 0)); | |
41089357 CM |
232 | if (!WARN_ON_ONCE(slab_is_available())) |
233 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 234 | } |
206a2a73 SC |
235 | } |
236 | } else { | |
da141706 | 237 | alloc_init_pmd(mm, pud, addr, next, phys, prot, alloc); |
206a2a73 | 238 | } |
c1cc1552 CM |
239 | phys += next - addr; |
240 | } while (pud++, addr = next, addr != end); | |
241 | } | |
242 | ||
243 | /* | |
244 | * Create the page directory entries and any necessary page tables for the | |
245 | * mapping specified by 'md'. | |
246 | */ | |
da141706 | 247 | static void __create_mapping(struct mm_struct *mm, pgd_t *pgd, |
e1e1fdda | 248 | phys_addr_t phys, unsigned long virt, |
da141706 LA |
249 | phys_addr_t size, pgprot_t prot, |
250 | void *(*alloc)(unsigned long size)) | |
c1cc1552 CM |
251 | { |
252 | unsigned long addr, length, end, next; | |
c1cc1552 | 253 | |
cc5d2b3b MR |
254 | /* |
255 | * If the virtual and physical address don't have the same offset | |
256 | * within a page, we cannot map the region as the caller expects. | |
257 | */ | |
258 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
259 | return; | |
260 | ||
9c4e08a3 | 261 | phys &= PAGE_MASK; |
c1cc1552 CM |
262 | addr = virt & PAGE_MASK; |
263 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
264 | ||
c1cc1552 CM |
265 | end = addr + length; |
266 | do { | |
267 | next = pgd_addr_end(addr, end); | |
da141706 | 268 | alloc_init_pud(mm, pgd, addr, next, phys, prot, alloc); |
c1cc1552 CM |
269 | phys += next - addr; |
270 | } while (pgd++, addr = next, addr != end); | |
271 | } | |
272 | ||
da141706 LA |
273 | static void *late_alloc(unsigned long size) |
274 | { | |
275 | void *ptr; | |
276 | ||
277 | BUG_ON(size > PAGE_SIZE); | |
278 | ptr = (void *)__get_free_page(PGALLOC_GFP); | |
279 | BUG_ON(!ptr); | |
280 | return ptr; | |
281 | } | |
282 | ||
c53e0baa | 283 | static void __init create_mapping(phys_addr_t phys, unsigned long virt, |
da141706 | 284 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
285 | { |
286 | if (virt < VMALLOC_START) { | |
287 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
288 | &phys, virt); | |
289 | return; | |
290 | } | |
e2c30ee3 | 291 | __create_mapping(&init_mm, pgd_offset_k(virt), phys, virt, |
da141706 | 292 | size, prot, early_alloc); |
d7ecbddf MS |
293 | } |
294 | ||
8ce837ce AB |
295 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
296 | unsigned long virt, phys_addr_t size, | |
297 | pgprot_t prot) | |
298 | { | |
da141706 | 299 | __create_mapping(mm, pgd_offset(mm, virt), phys, virt, size, prot, |
60305db9 | 300 | late_alloc); |
d7ecbddf MS |
301 | } |
302 | ||
da141706 LA |
303 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
304 | phys_addr_t size, pgprot_t prot) | |
305 | { | |
306 | if (virt < VMALLOC_START) { | |
307 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
308 | &phys, virt); | |
309 | return; | |
310 | } | |
311 | ||
e2c30ee3 | 312 | return __create_mapping(&init_mm, pgd_offset_k(virt), |
da141706 LA |
313 | phys, virt, size, prot, late_alloc); |
314 | } | |
315 | ||
316 | #ifdef CONFIG_DEBUG_RODATA | |
317 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
318 | { | |
319 | /* | |
320 | * Set up the executable regions using the existing section mappings | |
321 | * for now. This will get more fine grained later once all memory | |
322 | * is mapped | |
323 | */ | |
4fee9f36 AB |
324 | unsigned long kernel_x_start = round_down(__pa(_stext), SWAPPER_BLOCK_SIZE); |
325 | unsigned long kernel_x_end = round_up(__pa(__init_end), SWAPPER_BLOCK_SIZE); | |
da141706 LA |
326 | |
327 | if (end < kernel_x_start) { | |
328 | create_mapping(start, __phys_to_virt(start), | |
329 | end - start, PAGE_KERNEL); | |
330 | } else if (start >= kernel_x_end) { | |
331 | create_mapping(start, __phys_to_virt(start), | |
332 | end - start, PAGE_KERNEL); | |
333 | } else { | |
334 | if (start < kernel_x_start) | |
335 | create_mapping(start, __phys_to_virt(start), | |
336 | kernel_x_start - start, | |
337 | PAGE_KERNEL); | |
338 | create_mapping(kernel_x_start, | |
339 | __phys_to_virt(kernel_x_start), | |
340 | kernel_x_end - kernel_x_start, | |
341 | PAGE_KERNEL_EXEC); | |
342 | if (kernel_x_end < end) | |
343 | create_mapping(kernel_x_end, | |
344 | __phys_to_virt(kernel_x_end), | |
345 | end - kernel_x_end, | |
346 | PAGE_KERNEL); | |
347 | } | |
348 | ||
349 | } | |
350 | #else | |
351 | static void __init __map_memblock(phys_addr_t start, phys_addr_t end) | |
352 | { | |
353 | create_mapping(start, __phys_to_virt(start), end - start, | |
354 | PAGE_KERNEL_EXEC); | |
355 | } | |
356 | #endif | |
357 | ||
c1cc1552 CM |
358 | static void __init map_mem(void) |
359 | { | |
360 | struct memblock_region *reg; | |
e25208f7 | 361 | phys_addr_t limit; |
c1cc1552 | 362 | |
f6bc87c3 SC |
363 | /* |
364 | * Temporarily limit the memblock range. We need to do this as | |
365 | * create_mapping requires puds, pmds and ptes to be allocated from | |
366 | * memory addressable from the initial direct kernel mapping. | |
367 | * | |
3dec0fe4 | 368 | * The initial direct kernel mapping, located at swapper_pg_dir, gives |
b433dce0 SP |
369 | * us PUD_SIZE (with SECTION maps) or PMD_SIZE (without SECTION maps, |
370 | * memory starting from PHYS_OFFSET (which must be aligned to 2MB as | |
371 | * per Documentation/arm64/booting.txt). | |
f6bc87c3 | 372 | */ |
b433dce0 | 373 | limit = PHYS_OFFSET + SWAPPER_INIT_MAP_SIZE; |
e25208f7 | 374 | memblock_set_current_limit(limit); |
f6bc87c3 | 375 | |
c1cc1552 CM |
376 | /* map all the memory banks */ |
377 | for_each_memblock(memory, reg) { | |
378 | phys_addr_t start = reg->base; | |
379 | phys_addr_t end = start + reg->size; | |
380 | ||
381 | if (start >= end) | |
382 | break; | |
68709f45 AB |
383 | if (memblock_is_nomap(reg)) |
384 | continue; | |
c1cc1552 | 385 | |
b433dce0 SP |
386 | if (ARM64_SWAPPER_USES_SECTION_MAPS) { |
387 | /* | |
388 | * For the first memory bank align the start address and | |
389 | * current memblock limit to prevent create_mapping() from | |
390 | * allocating pte page tables from unmapped memory. With | |
391 | * the section maps, if the first block doesn't end on section | |
392 | * size boundary, create_mapping() will try to allocate a pte | |
393 | * page, which may be returned from an unmapped area. | |
394 | * When section maps are not used, the pte page table for the | |
395 | * current limit is already present in swapper_pg_dir. | |
396 | */ | |
397 | if (start < limit) | |
398 | start = ALIGN(start, SECTION_SIZE); | |
399 | if (end < limit) { | |
400 | limit = end & SECTION_MASK; | |
401 | memblock_set_current_limit(limit); | |
402 | } | |
e25208f7 | 403 | } |
da141706 | 404 | __map_memblock(start, end); |
c1cc1552 | 405 | } |
f6bc87c3 SC |
406 | |
407 | /* Limit no longer required. */ | |
408 | memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE); | |
c1cc1552 CM |
409 | } |
410 | ||
9a17a213 | 411 | static void __init fixup_executable(void) |
da141706 LA |
412 | { |
413 | #ifdef CONFIG_DEBUG_RODATA | |
414 | /* now that we are actually fully mapped, make the start/end more fine grained */ | |
4fee9f36 | 415 | if (!IS_ALIGNED((unsigned long)_stext, SWAPPER_BLOCK_SIZE)) { |
da141706 | 416 | unsigned long aligned_start = round_down(__pa(_stext), |
4fee9f36 | 417 | SWAPPER_BLOCK_SIZE); |
da141706 LA |
418 | |
419 | create_mapping(aligned_start, __phys_to_virt(aligned_start), | |
420 | __pa(_stext) - aligned_start, | |
421 | PAGE_KERNEL); | |
422 | } | |
423 | ||
4fee9f36 | 424 | if (!IS_ALIGNED((unsigned long)__init_end, SWAPPER_BLOCK_SIZE)) { |
da141706 | 425 | unsigned long aligned_end = round_up(__pa(__init_end), |
4fee9f36 | 426 | SWAPPER_BLOCK_SIZE); |
da141706 LA |
427 | create_mapping(__pa(__init_end), (unsigned long)__init_end, |
428 | aligned_end - __pa(__init_end), | |
429 | PAGE_KERNEL); | |
430 | } | |
431 | #endif | |
432 | } | |
433 | ||
434 | #ifdef CONFIG_DEBUG_RODATA | |
435 | void mark_rodata_ro(void) | |
436 | { | |
437 | create_mapping_late(__pa(_stext), (unsigned long)_stext, | |
438 | (unsigned long)_etext - (unsigned long)_stext, | |
0b2aa5b8 | 439 | PAGE_KERNEL_ROX); |
da141706 LA |
440 | |
441 | } | |
442 | #endif | |
443 | ||
444 | void fixup_init(void) | |
445 | { | |
446 | create_mapping_late(__pa(__init_begin), (unsigned long)__init_begin, | |
447 | (unsigned long)__init_end - (unsigned long)__init_begin, | |
448 | PAGE_KERNEL); | |
449 | } | |
450 | ||
c1cc1552 CM |
451 | /* |
452 | * paging_init() sets up the page tables, initialises the zone memory | |
453 | * maps and sets up the zero page. | |
454 | */ | |
455 | void __init paging_init(void) | |
456 | { | |
457 | void *zero_page; | |
458 | ||
c1cc1552 | 459 | map_mem(); |
da141706 | 460 | fixup_executable(); |
c1cc1552 | 461 | |
c1cc1552 CM |
462 | /* allocate the zero page. */ |
463 | zero_page = early_alloc(PAGE_SIZE); | |
464 | ||
465 | bootmem_init(); | |
466 | ||
467 | empty_zero_page = virt_to_page(zero_page); | |
c1cc1552 | 468 | |
32d63978 WD |
469 | /* Ensure the zero page is visible to the page table walker */ |
470 | dsb(ishst); | |
471 | ||
c1cc1552 CM |
472 | /* |
473 | * TTBR0 is only used for the identity mapping at this stage. Make it | |
474 | * point to zero page to avoid speculatively fetching new entries. | |
475 | */ | |
476 | cpu_set_reserved_ttbr0(); | |
8e63d388 | 477 | local_flush_tlb_all(); |
dd006da2 | 478 | cpu_set_default_tcr_t0sz(); |
c1cc1552 CM |
479 | } |
480 | ||
c1cc1552 CM |
481 | /* |
482 | * Check whether a kernel address is valid (derived from arch/x86/). | |
483 | */ | |
484 | int kern_addr_valid(unsigned long addr) | |
485 | { | |
486 | pgd_t *pgd; | |
487 | pud_t *pud; | |
488 | pmd_t *pmd; | |
489 | pte_t *pte; | |
490 | ||
491 | if ((((long)addr) >> VA_BITS) != -1UL) | |
492 | return 0; | |
493 | ||
494 | pgd = pgd_offset_k(addr); | |
495 | if (pgd_none(*pgd)) | |
496 | return 0; | |
497 | ||
498 | pud = pud_offset(pgd, addr); | |
499 | if (pud_none(*pud)) | |
500 | return 0; | |
501 | ||
206a2a73 SC |
502 | if (pud_sect(*pud)) |
503 | return pfn_valid(pud_pfn(*pud)); | |
504 | ||
c1cc1552 CM |
505 | pmd = pmd_offset(pud, addr); |
506 | if (pmd_none(*pmd)) | |
507 | return 0; | |
508 | ||
da6e4cb6 DA |
509 | if (pmd_sect(*pmd)) |
510 | return pfn_valid(pmd_pfn(*pmd)); | |
511 | ||
c1cc1552 CM |
512 | pte = pte_offset_kernel(pmd, addr); |
513 | if (pte_none(*pte)) | |
514 | return 0; | |
515 | ||
516 | return pfn_valid(pte_pfn(*pte)); | |
517 | } | |
518 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 519 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 520 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 521 | { |
0aad818b | 522 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 523 | } |
b433dce0 | 524 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 525 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 526 | { |
0aad818b | 527 | unsigned long addr = start; |
c1cc1552 CM |
528 | unsigned long next; |
529 | pgd_t *pgd; | |
530 | pud_t *pud; | |
531 | pmd_t *pmd; | |
532 | ||
533 | do { | |
534 | next = pmd_addr_end(addr, end); | |
535 | ||
536 | pgd = vmemmap_pgd_populate(addr, node); | |
537 | if (!pgd) | |
538 | return -ENOMEM; | |
539 | ||
540 | pud = vmemmap_pud_populate(pgd, addr, node); | |
541 | if (!pud) | |
542 | return -ENOMEM; | |
543 | ||
544 | pmd = pmd_offset(pud, addr); | |
545 | if (pmd_none(*pmd)) { | |
546 | void *p = NULL; | |
547 | ||
548 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
549 | if (!p) | |
550 | return -ENOMEM; | |
551 | ||
a501e324 | 552 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
553 | } else |
554 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
555 | } while (addr = next, addr != end); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 560 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
561 | { |
562 | } | |
c1cc1552 | 563 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 LA |
564 | |
565 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; | |
9f25e6ad | 566 | #if CONFIG_PGTABLE_LEVELS > 2 |
af86e597 LA |
567 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; |
568 | #endif | |
9f25e6ad | 569 | #if CONFIG_PGTABLE_LEVELS > 3 |
af86e597 LA |
570 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; |
571 | #endif | |
572 | ||
573 | static inline pud_t * fixmap_pud(unsigned long addr) | |
574 | { | |
575 | pgd_t *pgd = pgd_offset_k(addr); | |
576 | ||
577 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
578 | ||
579 | return pud_offset(pgd, addr); | |
580 | } | |
581 | ||
582 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
583 | { | |
584 | pud_t *pud = fixmap_pud(addr); | |
585 | ||
586 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
587 | ||
588 | return pmd_offset(pud, addr); | |
589 | } | |
590 | ||
591 | static inline pte_t * fixmap_pte(unsigned long addr) | |
592 | { | |
593 | pmd_t *pmd = fixmap_pmd(addr); | |
594 | ||
595 | BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); | |
596 | ||
597 | return pte_offset_kernel(pmd, addr); | |
598 | } | |
599 | ||
600 | void __init early_fixmap_init(void) | |
601 | { | |
602 | pgd_t *pgd; | |
603 | pud_t *pud; | |
604 | pmd_t *pmd; | |
605 | unsigned long addr = FIXADDR_START; | |
606 | ||
607 | pgd = pgd_offset_k(addr); | |
608 | pgd_populate(&init_mm, pgd, bm_pud); | |
609 | pud = pud_offset(pgd, addr); | |
610 | pud_populate(&init_mm, pud, bm_pmd); | |
611 | pmd = pmd_offset(pud, addr); | |
612 | pmd_populate_kernel(&init_mm, pmd, bm_pte); | |
613 | ||
614 | /* | |
615 | * The boot-ioremap range spans multiple pmds, for which | |
616 | * we are not preparted: | |
617 | */ | |
618 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
619 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
620 | ||
621 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
622 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
623 | WARN_ON(1); | |
624 | pr_warn("pmd %p != %p, %p\n", | |
625 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
626 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
627 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
628 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
629 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
630 | fix_to_virt(FIX_BTMAP_END)); | |
631 | ||
632 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
633 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
634 | } | |
635 | } | |
636 | ||
637 | void __set_fixmap(enum fixed_addresses idx, | |
638 | phys_addr_t phys, pgprot_t flags) | |
639 | { | |
640 | unsigned long addr = __fix_to_virt(idx); | |
641 | pte_t *pte; | |
642 | ||
b63dbef9 | 643 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
644 | |
645 | pte = fixmap_pte(addr); | |
646 | ||
647 | if (pgprot_val(flags)) { | |
648 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
649 | } else { | |
650 | pte_clear(&init_mm, addr, pte); | |
651 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
652 | } | |
653 | } | |
61bd93ce AB |
654 | |
655 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) | |
656 | { | |
657 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
fb226c3d | 658 | pgprot_t prot = PAGE_KERNEL_RO; |
b433dce0 | 659 | int size, offset; |
61bd93ce AB |
660 | void *dt_virt; |
661 | ||
662 | /* | |
663 | * Check whether the physical FDT address is set and meets the minimum | |
664 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
665 | * at least 8 bytes so that we can always access the size field of the | |
666 | * FDT header after mapping the first chunk, double check here if that | |
667 | * is indeed the case. | |
668 | */ | |
669 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
670 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
671 | return NULL; | |
672 | ||
673 | /* | |
674 | * Make sure that the FDT region can be mapped without the need to | |
675 | * allocate additional translation table pages, so that it is safe | |
676 | * to call create_mapping() this early. | |
677 | * | |
678 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
679 | * be in the same PMD as the rest of the fixmap. | |
680 | * On 4k pages, we'll use section mappings for the FDT so we only | |
681 | * have to be in the same PUD. | |
682 | */ | |
683 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
684 | ||
b433dce0 SP |
685 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
686 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 687 | |
b433dce0 | 688 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
689 | dt_virt = (void *)dt_virt_base + offset; |
690 | ||
691 | /* map the first chunk so we can read the size from the header */ | |
b433dce0 SP |
692 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
693 | SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce AB |
694 | |
695 | if (fdt_check_header(dt_virt) != 0) | |
696 | return NULL; | |
697 | ||
698 | size = fdt_totalsize(dt_virt); | |
699 | if (size > MAX_FDT_SIZE) | |
700 | return NULL; | |
701 | ||
b433dce0 SP |
702 | if (offset + size > SWAPPER_BLOCK_SIZE) |
703 | create_mapping(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, | |
704 | round_up(offset + size, SWAPPER_BLOCK_SIZE), prot); | |
61bd93ce AB |
705 | |
706 | memblock_reserve(dt_phys, size); | |
707 | ||
708 | return dt_virt; | |
709 | } |