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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> |
068a17a5 | 36 | #include <asm/kasan.h> |
b433dce0 | 37 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
38 | #include <asm/sections.h> |
39 | #include <asm/setup.h> | |
40 | #include <asm/sizes.h> | |
41 | #include <asm/tlb.h> | |
c79b954b | 42 | #include <asm/memblock.h> |
c1cc1552 CM |
43 | #include <asm/mmu_context.h> |
44 | ||
45 | #include "mm.h" | |
46 | ||
dd006da2 AB |
47 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
48 | ||
a7f8de16 AB |
49 | u64 kimage_voffset __read_mostly; |
50 | EXPORT_SYMBOL(kimage_voffset); | |
51 | ||
c1cc1552 CM |
52 | /* |
53 | * Empty_zero_page is a special page that is used for zero-initialized data | |
54 | * and COW. | |
55 | */ | |
5227cfa7 | 56 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
57 | EXPORT_SYMBOL(empty_zero_page); |
58 | ||
f9040773 AB |
59 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
60 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
61 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
62 | ||
c1cc1552 CM |
63 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
64 | unsigned long size, pgprot_t vma_prot) | |
65 | { | |
66 | if (!pfn_valid(pfn)) | |
67 | return pgprot_noncached(vma_prot); | |
68 | else if (file->f_flags & O_SYNC) | |
69 | return pgprot_writecombine(vma_prot); | |
70 | return vma_prot; | |
71 | } | |
72 | EXPORT_SYMBOL(phys_mem_access_prot); | |
73 | ||
f4710445 | 74 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 75 | { |
7142392d SP |
76 | phys_addr_t phys; |
77 | void *ptr; | |
78 | ||
21ab99c2 | 79 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
f4710445 MR |
80 | |
81 | /* | |
82 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
83 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
84 | * any level of table. | |
85 | */ | |
86 | ptr = pte_set_fixmap(phys); | |
87 | ||
21ab99c2 MR |
88 | memset(ptr, 0, PAGE_SIZE); |
89 | ||
f4710445 MR |
90 | /* |
91 | * Implicit barriers also ensure the zeroed page is visible to the page | |
92 | * table walker | |
93 | */ | |
94 | pte_clear_fixmap(); | |
95 | ||
96 | return phys; | |
c1cc1552 CM |
97 | } |
98 | ||
da141706 | 99 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
667c2759 | 100 | unsigned long end, unsigned long pfn, |
da141706 | 101 | pgprot_t prot, |
f4710445 | 102 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
103 | { |
104 | pte_t *pte; | |
105 | ||
4133af6c CM |
106 | BUG_ON(pmd_sect(*pmd)); |
107 | if (pmd_none(*pmd)) { | |
132233a7 LA |
108 | phys_addr_t pte_phys; |
109 | BUG_ON(!pgtable_alloc); | |
110 | pte_phys = pgtable_alloc(); | |
f4710445 | 111 | pte = pte_set_fixmap(pte_phys); |
f4710445 | 112 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
f4710445 | 113 | pte_clear_fixmap(); |
c1cc1552 | 114 | } |
a1c76574 | 115 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 116 | |
f4710445 | 117 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 118 | do { |
667c2759 CM |
119 | set_pte(pte, pfn_pte(pfn, prot)); |
120 | pfn++; | |
121 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
f4710445 MR |
122 | |
123 | pte_clear_fixmap(); | |
c1cc1552 CM |
124 | } |
125 | ||
11509a30 | 126 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 127 | phys_addr_t phys, pgprot_t prot, |
53e1b329 AB |
128 | phys_addr_t (*pgtable_alloc)(void), |
129 | bool allow_block_mappings) | |
c1cc1552 CM |
130 | { |
131 | pmd_t *pmd; | |
132 | unsigned long next; | |
133 | ||
134 | /* | |
135 | * Check for initial section mappings in the pgd/pud and remove them. | |
136 | */ | |
4133af6c CM |
137 | BUG_ON(pud_sect(*pud)); |
138 | if (pud_none(*pud)) { | |
132233a7 LA |
139 | phys_addr_t pmd_phys; |
140 | BUG_ON(!pgtable_alloc); | |
141 | pmd_phys = pgtable_alloc(); | |
f4710445 | 142 | pmd = pmd_set_fixmap(pmd_phys); |
f4710445 | 143 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
f4710445 | 144 | pmd_clear_fixmap(); |
c1cc1552 | 145 | } |
a1c76574 | 146 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 147 | |
f4710445 | 148 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 CM |
149 | do { |
150 | next = pmd_addr_end(addr, end); | |
151 | /* try section mapping first */ | |
83863f25 | 152 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
53e1b329 | 153 | allow_block_mappings) { |
a55f9929 | 154 | pmd_t old_pmd =*pmd; |
c661cb1c | 155 | pmd_set_huge(pmd, phys, prot); |
a55f9929 CM |
156 | /* |
157 | * Check for previous table entries created during | |
158 | * boot (__create_page_tables) and flush them. | |
159 | */ | |
523d6e9f | 160 | if (!pmd_none(old_pmd)) { |
a55f9929 | 161 | flush_tlb_all(); |
523d6e9f | 162 | if (pmd_table(old_pmd)) { |
316b39db | 163 | phys_addr_t table = pmd_page_paddr(old_pmd); |
41089357 CM |
164 | if (!WARN_ON_ONCE(slab_is_available())) |
165 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 166 | } |
167 | } | |
a55f9929 | 168 | } else { |
667c2759 | 169 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
21ab99c2 | 170 | prot, pgtable_alloc); |
a55f9929 | 171 | } |
c1cc1552 CM |
172 | phys += next - addr; |
173 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
174 | |
175 | pmd_clear_fixmap(); | |
c1cc1552 CM |
176 | } |
177 | ||
da141706 LA |
178 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
179 | unsigned long phys) | |
180 | { | |
181 | if (PAGE_SHIFT != 12) | |
182 | return false; | |
183 | ||
184 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
185 | return false; | |
186 | ||
187 | return true; | |
188 | } | |
189 | ||
11509a30 | 190 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 191 | phys_addr_t phys, pgprot_t prot, |
53e1b329 AB |
192 | phys_addr_t (*pgtable_alloc)(void), |
193 | bool allow_block_mappings) | |
c1cc1552 | 194 | { |
c79b954b | 195 | pud_t *pud; |
c1cc1552 CM |
196 | unsigned long next; |
197 | ||
c79b954b | 198 | if (pgd_none(*pgd)) { |
132233a7 LA |
199 | phys_addr_t pud_phys; |
200 | BUG_ON(!pgtable_alloc); | |
201 | pud_phys = pgtable_alloc(); | |
f4710445 | 202 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
203 | } |
204 | BUG_ON(pgd_bad(*pgd)); | |
205 | ||
f4710445 | 206 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 CM |
207 | do { |
208 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
209 | |
210 | /* | |
211 | * For 4K granule only, attempt to put down a 1GB block | |
212 | */ | |
53e1b329 | 213 | if (use_1G_block(addr, next, phys) && allow_block_mappings) { |
206a2a73 | 214 | pud_t old_pud = *pud; |
c661cb1c | 215 | pud_set_huge(pud, phys, prot); |
206a2a73 SC |
216 | |
217 | /* | |
218 | * If we have an old value for a pud, it will | |
219 | * be pointing to a pmd table that we no longer | |
220 | * need (from swapper_pg_dir). | |
221 | * | |
222 | * Look up the old pmd table and free it. | |
223 | */ | |
224 | if (!pud_none(old_pud)) { | |
206a2a73 | 225 | flush_tlb_all(); |
523d6e9f | 226 | if (pud_table(old_pud)) { |
316b39db | 227 | phys_addr_t table = pud_page_paddr(old_pud); |
41089357 CM |
228 | if (!WARN_ON_ONCE(slab_is_available())) |
229 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 230 | } |
206a2a73 SC |
231 | } |
232 | } else { | |
11509a30 | 233 | alloc_init_pmd(pud, addr, next, phys, prot, |
53e1b329 | 234 | pgtable_alloc, allow_block_mappings); |
206a2a73 | 235 | } |
c1cc1552 CM |
236 | phys += next - addr; |
237 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
238 | |
239 | pud_clear_fixmap(); | |
c1cc1552 CM |
240 | } |
241 | ||
40f87d31 AB |
242 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
243 | unsigned long virt, phys_addr_t size, | |
244 | pgprot_t prot, | |
245 | phys_addr_t (*pgtable_alloc)(void), | |
246 | bool allow_block_mappings) | |
c1cc1552 CM |
247 | { |
248 | unsigned long addr, length, end, next; | |
40f87d31 | 249 | pgd_t *pgd = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 250 | |
cc5d2b3b MR |
251 | /* |
252 | * If the virtual and physical address don't have the same offset | |
253 | * within a page, we cannot map the region as the caller expects. | |
254 | */ | |
255 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
256 | return; | |
257 | ||
9c4e08a3 | 258 | phys &= PAGE_MASK; |
c1cc1552 CM |
259 | addr = virt & PAGE_MASK; |
260 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
261 | ||
c1cc1552 CM |
262 | end = addr + length; |
263 | do { | |
264 | next = pgd_addr_end(addr, end); | |
53e1b329 AB |
265 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc, |
266 | allow_block_mappings); | |
c1cc1552 CM |
267 | phys += next - addr; |
268 | } while (pgd++, addr = next, addr != end); | |
269 | } | |
270 | ||
1378dc3d | 271 | static phys_addr_t pgd_pgtable_alloc(void) |
da141706 | 272 | { |
21ab99c2 | 273 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
1378dc3d AB |
274 | if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) |
275 | BUG(); | |
21ab99c2 MR |
276 | |
277 | /* Ensure the zeroed page is visible to the page table walker */ | |
278 | dsb(ishst); | |
f4710445 | 279 | return __pa(ptr); |
da141706 LA |
280 | } |
281 | ||
132233a7 LA |
282 | /* |
283 | * This function can only be used to modify existing table entries, | |
284 | * without allocating new levels of table. Note that this permits the | |
285 | * creation of new section or page entries. | |
286 | */ | |
287 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 288 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
289 | { |
290 | if (virt < VMALLOC_START) { | |
291 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
292 | &phys, virt); | |
293 | return; | |
294 | } | |
53e1b329 | 295 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, true); |
d7ecbddf MS |
296 | } |
297 | ||
8ce837ce AB |
298 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
299 | unsigned long virt, phys_addr_t size, | |
53e1b329 | 300 | pgprot_t prot, bool allow_block_mappings) |
8ce837ce | 301 | { |
1378dc3d AB |
302 | BUG_ON(mm == &init_mm); |
303 | ||
11509a30 | 304 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
1378dc3d | 305 | pgd_pgtable_alloc, allow_block_mappings); |
d7ecbddf MS |
306 | } |
307 | ||
da141706 LA |
308 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
309 | phys_addr_t size, pgprot_t prot) | |
310 | { | |
311 | if (virt < VMALLOC_START) { | |
312 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
313 | &phys, virt); | |
314 | return; | |
315 | } | |
316 | ||
11509a30 | 317 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
258a1605 | 318 | NULL, !debug_pagealloc_enabled()); |
da141706 LA |
319 | } |
320 | ||
068a17a5 | 321 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 322 | { |
7eb90f2f | 323 | unsigned long kernel_start = __pa(_text); |
9fdc14c5 | 324 | unsigned long kernel_end = __pa(__init_begin); |
068a17a5 | 325 | |
da141706 | 326 | /* |
f9040773 AB |
327 | * Take care not to create a writable alias for the |
328 | * read-only text and rodata sections of the kernel image. | |
da141706 | 329 | */ |
068a17a5 | 330 | |
9fdc14c5 | 331 | /* No overlap with the kernel text/rodata */ |
068a17a5 MR |
332 | if (end < kernel_start || start >= kernel_end) { |
333 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
334 | end - start, PAGE_KERNEL, | |
53e1b329 AB |
335 | early_pgtable_alloc, |
336 | !debug_pagealloc_enabled()); | |
068a17a5 | 337 | return; |
da141706 LA |
338 | } |
339 | ||
068a17a5 | 340 | /* |
9fdc14c5 | 341 | * This block overlaps the kernel text/rodata mappings. |
f9040773 | 342 | * Map the portion(s) which don't overlap. |
068a17a5 MR |
343 | */ |
344 | if (start < kernel_start) | |
345 | __create_pgd_mapping(pgd, start, | |
346 | __phys_to_virt(start), | |
347 | kernel_start - start, PAGE_KERNEL, | |
53e1b329 AB |
348 | early_pgtable_alloc, |
349 | !debug_pagealloc_enabled()); | |
068a17a5 MR |
350 | if (kernel_end < end) |
351 | __create_pgd_mapping(pgd, kernel_end, | |
352 | __phys_to_virt(kernel_end), | |
353 | end - kernel_end, PAGE_KERNEL, | |
53e1b329 AB |
354 | early_pgtable_alloc, |
355 | !debug_pagealloc_enabled()); | |
f9040773 AB |
356 | |
357 | /* | |
9fdc14c5 | 358 | * Map the linear alias of the [_text, __init_begin) interval as |
f9040773 AB |
359 | * read-only/non-executable. This makes the contents of the |
360 | * region accessible to subsystems such as hibernate, but | |
361 | * protects it from inadvertent modification or execution. | |
362 | */ | |
363 | __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start), | |
364 | kernel_end - kernel_start, PAGE_KERNEL_RO, | |
53e1b329 | 365 | early_pgtable_alloc, !debug_pagealloc_enabled()); |
da141706 | 366 | } |
da141706 | 367 | |
068a17a5 | 368 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
369 | { |
370 | struct memblock_region *reg; | |
f6bc87c3 | 371 | |
c1cc1552 CM |
372 | /* map all the memory banks */ |
373 | for_each_memblock(memory, reg) { | |
374 | phys_addr_t start = reg->base; | |
375 | phys_addr_t end = start + reg->size; | |
376 | ||
377 | if (start >= end) | |
378 | break; | |
68709f45 AB |
379 | if (memblock_is_nomap(reg)) |
380 | continue; | |
c1cc1552 | 381 | |
068a17a5 | 382 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
383 | } |
384 | } | |
385 | ||
da141706 LA |
386 | void mark_rodata_ro(void) |
387 | { | |
2f39b5f9 | 388 | unsigned long section_size; |
f9040773 | 389 | |
9fdc14c5 | 390 | section_size = (unsigned long)_etext - (unsigned long)_text; |
7eb90f2f | 391 | create_mapping_late(__pa(_text), (unsigned long)_text, |
2f39b5f9 JL |
392 | section_size, PAGE_KERNEL_ROX); |
393 | /* | |
9fdc14c5 AB |
394 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
395 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 396 | */ |
9fdc14c5 | 397 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
2f39b5f9 JL |
398 | create_mapping_late(__pa(__start_rodata), (unsigned long)__start_rodata, |
399 | section_size, PAGE_KERNEL_RO); | |
da141706 | 400 | } |
da141706 LA |
401 | |
402 | void fixup_init(void) | |
403 | { | |
f9040773 AB |
404 | /* |
405 | * Unmap the __init region but leave the VM area in place. This | |
406 | * prevents the region from being reused for kernel modules, which | |
407 | * is not supported by kallsyms. | |
408 | */ | |
409 | unmap_kernel_range((u64)__init_begin, (u64)(__init_end - __init_begin)); | |
da141706 LA |
410 | } |
411 | ||
2c09ec06 AB |
412 | static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end, |
413 | pgprot_t prot, struct vm_struct *vma) | |
068a17a5 MR |
414 | { |
415 | phys_addr_t pa_start = __pa(va_start); | |
416 | unsigned long size = va_end - va_start; | |
417 | ||
418 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
419 | BUG_ON(!PAGE_ALIGNED(size)); | |
420 | ||
421 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
53e1b329 | 422 | early_pgtable_alloc, !debug_pagealloc_enabled()); |
f9040773 AB |
423 | |
424 | vma->addr = va_start; | |
425 | vma->phys_addr = pa_start; | |
426 | vma->size = size; | |
427 | vma->flags = VM_MAP; | |
428 | vma->caller = __builtin_return_address(0); | |
429 | ||
430 | vm_area_add_early(vma); | |
068a17a5 MR |
431 | } |
432 | ||
433 | /* | |
434 | * Create fine-grained mappings for the kernel. | |
435 | */ | |
436 | static void __init map_kernel(pgd_t *pgd) | |
437 | { | |
2f39b5f9 | 438 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_init, vmlinux_data; |
068a17a5 | 439 | |
9fdc14c5 AB |
440 | map_kernel_segment(pgd, _text, _etext, PAGE_KERNEL_EXEC, &vmlinux_text); |
441 | map_kernel_segment(pgd, __start_rodata, __init_begin, PAGE_KERNEL, &vmlinux_rodata); | |
2c09ec06 AB |
442 | map_kernel_segment(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC, |
443 | &vmlinux_init); | |
444 | map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data); | |
068a17a5 | 445 | |
f9040773 AB |
446 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
447 | /* | |
448 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
449 | * live in the carveout for the swapper_pg_dir. We can simply | |
450 | * re-use the existing dir for the fixmap. | |
451 | */ | |
452 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
453 | *pgd_offset_k(FIXADDR_START)); | |
454 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
455 | /* | |
456 | * The fixmap shares its top level pgd entry with the kernel | |
457 | * mapping. This can really only occur when we are running | |
458 | * with 16k/4 levels, so we can simply reuse the pud level | |
459 | * entry instead. | |
460 | */ | |
461 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
462 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
463 | __pud(__pa(bm_pmd) | PUD_TYPE_TABLE)); | |
464 | pud_clear_fixmap(); | |
465 | } else { | |
466 | BUG(); | |
467 | } | |
068a17a5 MR |
468 | |
469 | kasan_copy_shadow(pgd); | |
470 | } | |
471 | ||
c1cc1552 CM |
472 | /* |
473 | * paging_init() sets up the page tables, initialises the zone memory | |
474 | * maps and sets up the zero page. | |
475 | */ | |
476 | void __init paging_init(void) | |
477 | { | |
068a17a5 MR |
478 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
479 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
480 | ||
481 | map_kernel(pgd); | |
482 | map_mem(pgd); | |
483 | ||
484 | /* | |
485 | * We want to reuse the original swapper_pg_dir so we don't have to | |
486 | * communicate the new address to non-coherent secondaries in | |
487 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
488 | * adrp+add rather than a load from some global variable. | |
489 | * | |
490 | * To do this we need to go via a temporary pgd. | |
491 | */ | |
492 | cpu_replace_ttbr1(__va(pgd_phys)); | |
493 | memcpy(swapper_pg_dir, pgd, PAGE_SIZE); | |
494 | cpu_replace_ttbr1(swapper_pg_dir); | |
495 | ||
496 | pgd_clear_fixmap(); | |
497 | memblock_free(pgd_phys, PAGE_SIZE); | |
498 | ||
499 | /* | |
500 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
501 | * allocated with it. | |
502 | */ | |
503 | memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE, | |
504 | SWAPPER_DIR_SIZE - PAGE_SIZE); | |
c1cc1552 CM |
505 | } |
506 | ||
c1cc1552 CM |
507 | /* |
508 | * Check whether a kernel address is valid (derived from arch/x86/). | |
509 | */ | |
510 | int kern_addr_valid(unsigned long addr) | |
511 | { | |
512 | pgd_t *pgd; | |
513 | pud_t *pud; | |
514 | pmd_t *pmd; | |
515 | pte_t *pte; | |
516 | ||
517 | if ((((long)addr) >> VA_BITS) != -1UL) | |
518 | return 0; | |
519 | ||
520 | pgd = pgd_offset_k(addr); | |
521 | if (pgd_none(*pgd)) | |
522 | return 0; | |
523 | ||
524 | pud = pud_offset(pgd, addr); | |
525 | if (pud_none(*pud)) | |
526 | return 0; | |
527 | ||
206a2a73 SC |
528 | if (pud_sect(*pud)) |
529 | return pfn_valid(pud_pfn(*pud)); | |
530 | ||
c1cc1552 CM |
531 | pmd = pmd_offset(pud, addr); |
532 | if (pmd_none(*pmd)) | |
533 | return 0; | |
534 | ||
da6e4cb6 DA |
535 | if (pmd_sect(*pmd)) |
536 | return pfn_valid(pmd_pfn(*pmd)); | |
537 | ||
c1cc1552 CM |
538 | pte = pte_offset_kernel(pmd, addr); |
539 | if (pte_none(*pte)) | |
540 | return 0; | |
541 | ||
542 | return pfn_valid(pte_pfn(*pte)); | |
543 | } | |
544 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 545 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 546 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 547 | { |
0aad818b | 548 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 549 | } |
b433dce0 | 550 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 551 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 552 | { |
0aad818b | 553 | unsigned long addr = start; |
c1cc1552 CM |
554 | unsigned long next; |
555 | pgd_t *pgd; | |
556 | pud_t *pud; | |
557 | pmd_t *pmd; | |
558 | ||
559 | do { | |
560 | next = pmd_addr_end(addr, end); | |
561 | ||
562 | pgd = vmemmap_pgd_populate(addr, node); | |
563 | if (!pgd) | |
564 | return -ENOMEM; | |
565 | ||
566 | pud = vmemmap_pud_populate(pgd, addr, node); | |
567 | if (!pud) | |
568 | return -ENOMEM; | |
569 | ||
570 | pmd = pmd_offset(pud, addr); | |
571 | if (pmd_none(*pmd)) { | |
572 | void *p = NULL; | |
573 | ||
574 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
575 | if (!p) | |
576 | return -ENOMEM; | |
577 | ||
a501e324 | 578 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
579 | } else |
580 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
581 | } while (addr = next, addr != end); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 586 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
587 | { |
588 | } | |
c1cc1552 | 589 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 590 | |
af86e597 LA |
591 | static inline pud_t * fixmap_pud(unsigned long addr) |
592 | { | |
593 | pgd_t *pgd = pgd_offset_k(addr); | |
594 | ||
595 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
596 | ||
157962f5 | 597 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
598 | } |
599 | ||
600 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
601 | { | |
602 | pud_t *pud = fixmap_pud(addr); | |
603 | ||
604 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
605 | ||
157962f5 | 606 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
607 | } |
608 | ||
609 | static inline pte_t * fixmap_pte(unsigned long addr) | |
610 | { | |
157962f5 | 611 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
612 | } |
613 | ||
614 | void __init early_fixmap_init(void) | |
615 | { | |
616 | pgd_t *pgd; | |
617 | pud_t *pud; | |
618 | pmd_t *pmd; | |
619 | unsigned long addr = FIXADDR_START; | |
620 | ||
621 | pgd = pgd_offset_k(addr); | |
f80fb3a3 AB |
622 | if (CONFIG_PGTABLE_LEVELS > 3 && |
623 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa(bm_pud))) { | |
f9040773 AB |
624 | /* |
625 | * We only end up here if the kernel mapping and the fixmap | |
626 | * share the top level pgd entry, which should only happen on | |
627 | * 16k/4 levels configurations. | |
628 | */ | |
629 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
630 | pud = pud_offset_kimg(pgd, addr); | |
631 | } else { | |
632 | pgd_populate(&init_mm, pgd, bm_pud); | |
633 | pud = fixmap_pud(addr); | |
634 | } | |
af86e597 | 635 | pud_populate(&init_mm, pud, bm_pmd); |
157962f5 | 636 | pmd = fixmap_pmd(addr); |
af86e597 LA |
637 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
638 | ||
639 | /* | |
640 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 641 | * we are not prepared: |
af86e597 LA |
642 | */ |
643 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
644 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
645 | ||
646 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
647 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
648 | WARN_ON(1); | |
649 | pr_warn("pmd %p != %p, %p\n", | |
650 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
651 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
652 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
653 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
654 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
655 | fix_to_virt(FIX_BTMAP_END)); | |
656 | ||
657 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
658 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
659 | } | |
660 | } | |
661 | ||
662 | void __set_fixmap(enum fixed_addresses idx, | |
663 | phys_addr_t phys, pgprot_t flags) | |
664 | { | |
665 | unsigned long addr = __fix_to_virt(idx); | |
666 | pte_t *pte; | |
667 | ||
b63dbef9 | 668 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
669 | |
670 | pte = fixmap_pte(addr); | |
671 | ||
672 | if (pgprot_val(flags)) { | |
673 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
674 | } else { | |
675 | pte_clear(&init_mm, addr, pte); | |
676 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
677 | } | |
678 | } | |
61bd93ce | 679 | |
f80fb3a3 | 680 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
681 | { |
682 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 683 | int offset; |
61bd93ce AB |
684 | void *dt_virt; |
685 | ||
686 | /* | |
687 | * Check whether the physical FDT address is set and meets the minimum | |
688 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
689 | * at least 8 bytes so that we can always access the magic and size |
690 | * fields of the FDT header after mapping the first chunk, double check | |
691 | * here if that is indeed the case. | |
61bd93ce AB |
692 | */ |
693 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
694 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
695 | return NULL; | |
696 | ||
697 | /* | |
698 | * Make sure that the FDT region can be mapped without the need to | |
699 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 700 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
701 | * |
702 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
703 | * be in the same PMD as the rest of the fixmap. | |
704 | * On 4k pages, we'll use section mappings for the FDT so we only | |
705 | * have to be in the same PUD. | |
706 | */ | |
707 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
708 | ||
b433dce0 SP |
709 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
710 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 711 | |
b433dce0 | 712 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
713 | dt_virt = (void *)dt_virt_base + offset; |
714 | ||
715 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
716 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
717 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 718 | |
04a84810 | 719 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
720 | return NULL; |
721 | ||
f80fb3a3 AB |
722 | *size = fdt_totalsize(dt_virt); |
723 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
724 | return NULL; |
725 | ||
f80fb3a3 | 726 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 727 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 728 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 729 | |
f80fb3a3 AB |
730 | return dt_virt; |
731 | } | |
61bd93ce | 732 | |
f80fb3a3 AB |
733 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
734 | { | |
735 | void *dt_virt; | |
736 | int size; | |
737 | ||
738 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
739 | if (!dt_virt) | |
740 | return NULL; | |
741 | ||
742 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
743 | return dt_virt; |
744 | } | |
324420bf AB |
745 | |
746 | int __init arch_ioremap_pud_supported(void) | |
747 | { | |
748 | /* only 4k granule supports level 1 block mappings */ | |
749 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
750 | } | |
751 | ||
752 | int __init arch_ioremap_pmd_supported(void) | |
753 | { | |
754 | return 1; | |
755 | } | |
756 | ||
757 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
758 | { | |
759 | BUG_ON(phys & ~PUD_MASK); | |
760 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
761 | return 1; | |
762 | } | |
763 | ||
764 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
765 | { | |
766 | BUG_ON(phys & ~PMD_MASK); | |
767 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
768 | return 1; | |
769 | } | |
770 | ||
771 | int pud_clear_huge(pud_t *pud) | |
772 | { | |
773 | if (!pud_sect(*pud)) | |
774 | return 0; | |
775 | pud_clear(pud); | |
776 | return 1; | |
777 | } | |
778 | ||
779 | int pmd_clear_huge(pmd_t *pmd) | |
780 | { | |
781 | if (!pmd_sect(*pmd)) | |
782 | return 0; | |
783 | pmd_clear(pmd); | |
784 | return 1; | |
785 | } |