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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 | ||
5a9e3e15 | 20 | #include <linux/cache.h> |
c1cc1552 CM |
21 | #include <linux/export.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/init.h> | |
61bd93ce | 25 | #include <linux/libfdt.h> |
c1cc1552 CM |
26 | #include <linux/mman.h> |
27 | #include <linux/nodemask.h> | |
28 | #include <linux/memblock.h> | |
29 | #include <linux/fs.h> | |
2475ff9d | 30 | #include <linux/io.h> |
41089357 | 31 | #include <linux/slab.h> |
da141706 | 32 | #include <linux/stop_machine.h> |
c1cc1552 | 33 | |
21ab99c2 | 34 | #include <asm/barrier.h> |
c1cc1552 | 35 | #include <asm/cputype.h> |
af86e597 | 36 | #include <asm/fixmap.h> |
068a17a5 | 37 | #include <asm/kasan.h> |
b433dce0 | 38 | #include <asm/kernel-pgtable.h> |
c1cc1552 CM |
39 | #include <asm/sections.h> |
40 | #include <asm/setup.h> | |
41 | #include <asm/sizes.h> | |
42 | #include <asm/tlb.h> | |
c79b954b | 43 | #include <asm/memblock.h> |
c1cc1552 CM |
44 | #include <asm/mmu_context.h> |
45 | ||
dd006da2 AB |
46 | u64 idmap_t0sz = TCR_T0SZ(VA_BITS); |
47 | ||
5a9e3e15 | 48 | u64 kimage_voffset __ro_after_init; |
a7f8de16 AB |
49 | EXPORT_SYMBOL(kimage_voffset); |
50 | ||
c1cc1552 CM |
51 | /* |
52 | * Empty_zero_page is a special page that is used for zero-initialized data | |
53 | * and COW. | |
54 | */ | |
5227cfa7 | 55 | unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; |
c1cc1552 CM |
56 | EXPORT_SYMBOL(empty_zero_page); |
57 | ||
f9040773 AB |
58 | static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; |
59 | static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused; | |
60 | static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused; | |
61 | ||
c1cc1552 CM |
62 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
63 | unsigned long size, pgprot_t vma_prot) | |
64 | { | |
65 | if (!pfn_valid(pfn)) | |
66 | return pgprot_noncached(vma_prot); | |
67 | else if (file->f_flags & O_SYNC) | |
68 | return pgprot_writecombine(vma_prot); | |
69 | return vma_prot; | |
70 | } | |
71 | EXPORT_SYMBOL(phys_mem_access_prot); | |
72 | ||
f4710445 | 73 | static phys_addr_t __init early_pgtable_alloc(void) |
c1cc1552 | 74 | { |
7142392d SP |
75 | phys_addr_t phys; |
76 | void *ptr; | |
77 | ||
21ab99c2 | 78 | phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
f4710445 MR |
79 | |
80 | /* | |
81 | * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE | |
82 | * slot will be free, so we can (ab)use the FIX_PTE slot to initialise | |
83 | * any level of table. | |
84 | */ | |
85 | ptr = pte_set_fixmap(phys); | |
86 | ||
21ab99c2 MR |
87 | memset(ptr, 0, PAGE_SIZE); |
88 | ||
f4710445 MR |
89 | /* |
90 | * Implicit barriers also ensure the zeroed page is visible to the page | |
91 | * table walker | |
92 | */ | |
93 | pte_clear_fixmap(); | |
94 | ||
95 | return phys; | |
c1cc1552 CM |
96 | } |
97 | ||
da141706 | 98 | static void alloc_init_pte(pmd_t *pmd, unsigned long addr, |
667c2759 | 99 | unsigned long end, unsigned long pfn, |
da141706 | 100 | pgprot_t prot, |
f4710445 | 101 | phys_addr_t (*pgtable_alloc)(void)) |
c1cc1552 CM |
102 | { |
103 | pte_t *pte; | |
104 | ||
4133af6c CM |
105 | BUG_ON(pmd_sect(*pmd)); |
106 | if (pmd_none(*pmd)) { | |
132233a7 LA |
107 | phys_addr_t pte_phys; |
108 | BUG_ON(!pgtable_alloc); | |
109 | pte_phys = pgtable_alloc(); | |
f4710445 | 110 | pte = pte_set_fixmap(pte_phys); |
f4710445 | 111 | __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE); |
f4710445 | 112 | pte_clear_fixmap(); |
c1cc1552 | 113 | } |
a1c76574 | 114 | BUG_ON(pmd_bad(*pmd)); |
c1cc1552 | 115 | |
f4710445 | 116 | pte = pte_set_fixmap_offset(pmd, addr); |
c1cc1552 | 117 | do { |
667c2759 CM |
118 | set_pte(pte, pfn_pte(pfn, prot)); |
119 | pfn++; | |
120 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
f4710445 MR |
121 | |
122 | pte_clear_fixmap(); | |
c1cc1552 CM |
123 | } |
124 | ||
11509a30 | 125 | static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end, |
da141706 | 126 | phys_addr_t phys, pgprot_t prot, |
53e1b329 AB |
127 | phys_addr_t (*pgtable_alloc)(void), |
128 | bool allow_block_mappings) | |
c1cc1552 CM |
129 | { |
130 | pmd_t *pmd; | |
131 | unsigned long next; | |
132 | ||
133 | /* | |
134 | * Check for initial section mappings in the pgd/pud and remove them. | |
135 | */ | |
4133af6c CM |
136 | BUG_ON(pud_sect(*pud)); |
137 | if (pud_none(*pud)) { | |
132233a7 LA |
138 | phys_addr_t pmd_phys; |
139 | BUG_ON(!pgtable_alloc); | |
140 | pmd_phys = pgtable_alloc(); | |
f4710445 | 141 | pmd = pmd_set_fixmap(pmd_phys); |
f4710445 | 142 | __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE); |
f4710445 | 143 | pmd_clear_fixmap(); |
c1cc1552 | 144 | } |
a1c76574 | 145 | BUG_ON(pud_bad(*pud)); |
c1cc1552 | 146 | |
f4710445 | 147 | pmd = pmd_set_fixmap_offset(pud, addr); |
c1cc1552 CM |
148 | do { |
149 | next = pmd_addr_end(addr, end); | |
150 | /* try section mapping first */ | |
83863f25 | 151 | if (((addr | next | phys) & ~SECTION_MASK) == 0 && |
53e1b329 | 152 | allow_block_mappings) { |
a55f9929 | 153 | pmd_t old_pmd =*pmd; |
c661cb1c | 154 | pmd_set_huge(pmd, phys, prot); |
a55f9929 CM |
155 | /* |
156 | * Check for previous table entries created during | |
157 | * boot (__create_page_tables) and flush them. | |
158 | */ | |
523d6e9f | 159 | if (!pmd_none(old_pmd)) { |
a55f9929 | 160 | flush_tlb_all(); |
523d6e9f | 161 | if (pmd_table(old_pmd)) { |
316b39db | 162 | phys_addr_t table = pmd_page_paddr(old_pmd); |
41089357 CM |
163 | if (!WARN_ON_ONCE(slab_is_available())) |
164 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 165 | } |
166 | } | |
a55f9929 | 167 | } else { |
667c2759 | 168 | alloc_init_pte(pmd, addr, next, __phys_to_pfn(phys), |
21ab99c2 | 169 | prot, pgtable_alloc); |
a55f9929 | 170 | } |
c1cc1552 CM |
171 | phys += next - addr; |
172 | } while (pmd++, addr = next, addr != end); | |
f4710445 MR |
173 | |
174 | pmd_clear_fixmap(); | |
c1cc1552 CM |
175 | } |
176 | ||
da141706 LA |
177 | static inline bool use_1G_block(unsigned long addr, unsigned long next, |
178 | unsigned long phys) | |
179 | { | |
180 | if (PAGE_SHIFT != 12) | |
181 | return false; | |
182 | ||
183 | if (((addr | next | phys) & ~PUD_MASK) != 0) | |
184 | return false; | |
185 | ||
186 | return true; | |
187 | } | |
188 | ||
11509a30 | 189 | static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end, |
da141706 | 190 | phys_addr_t phys, pgprot_t prot, |
53e1b329 AB |
191 | phys_addr_t (*pgtable_alloc)(void), |
192 | bool allow_block_mappings) | |
c1cc1552 | 193 | { |
c79b954b | 194 | pud_t *pud; |
c1cc1552 CM |
195 | unsigned long next; |
196 | ||
c79b954b | 197 | if (pgd_none(*pgd)) { |
132233a7 LA |
198 | phys_addr_t pud_phys; |
199 | BUG_ON(!pgtable_alloc); | |
200 | pud_phys = pgtable_alloc(); | |
f4710445 | 201 | __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE); |
c79b954b JL |
202 | } |
203 | BUG_ON(pgd_bad(*pgd)); | |
204 | ||
f4710445 | 205 | pud = pud_set_fixmap_offset(pgd, addr); |
c1cc1552 CM |
206 | do { |
207 | next = pud_addr_end(addr, end); | |
206a2a73 SC |
208 | |
209 | /* | |
210 | * For 4K granule only, attempt to put down a 1GB block | |
211 | */ | |
53e1b329 | 212 | if (use_1G_block(addr, next, phys) && allow_block_mappings) { |
206a2a73 | 213 | pud_t old_pud = *pud; |
c661cb1c | 214 | pud_set_huge(pud, phys, prot); |
206a2a73 SC |
215 | |
216 | /* | |
217 | * If we have an old value for a pud, it will | |
218 | * be pointing to a pmd table that we no longer | |
219 | * need (from swapper_pg_dir). | |
220 | * | |
221 | * Look up the old pmd table and free it. | |
222 | */ | |
223 | if (!pud_none(old_pud)) { | |
206a2a73 | 224 | flush_tlb_all(); |
523d6e9f | 225 | if (pud_table(old_pud)) { |
316b39db | 226 | phys_addr_t table = pud_page_paddr(old_pud); |
41089357 CM |
227 | if (!WARN_ON_ONCE(slab_is_available())) |
228 | memblock_free(table, PAGE_SIZE); | |
523d6e9f | 229 | } |
206a2a73 SC |
230 | } |
231 | } else { | |
11509a30 | 232 | alloc_init_pmd(pud, addr, next, phys, prot, |
53e1b329 | 233 | pgtable_alloc, allow_block_mappings); |
206a2a73 | 234 | } |
c1cc1552 CM |
235 | phys += next - addr; |
236 | } while (pud++, addr = next, addr != end); | |
f4710445 MR |
237 | |
238 | pud_clear_fixmap(); | |
c1cc1552 CM |
239 | } |
240 | ||
40f87d31 AB |
241 | static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys, |
242 | unsigned long virt, phys_addr_t size, | |
243 | pgprot_t prot, | |
244 | phys_addr_t (*pgtable_alloc)(void), | |
245 | bool allow_block_mappings) | |
c1cc1552 CM |
246 | { |
247 | unsigned long addr, length, end, next; | |
40f87d31 | 248 | pgd_t *pgd = pgd_offset_raw(pgdir, virt); |
c1cc1552 | 249 | |
cc5d2b3b MR |
250 | /* |
251 | * If the virtual and physical address don't have the same offset | |
252 | * within a page, we cannot map the region as the caller expects. | |
253 | */ | |
254 | if (WARN_ON((phys ^ virt) & ~PAGE_MASK)) | |
255 | return; | |
256 | ||
9c4e08a3 | 257 | phys &= PAGE_MASK; |
c1cc1552 CM |
258 | addr = virt & PAGE_MASK; |
259 | length = PAGE_ALIGN(size + (virt & ~PAGE_MASK)); | |
260 | ||
c1cc1552 CM |
261 | end = addr + length; |
262 | do { | |
263 | next = pgd_addr_end(addr, end); | |
53e1b329 AB |
264 | alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc, |
265 | allow_block_mappings); | |
c1cc1552 CM |
266 | phys += next - addr; |
267 | } while (pgd++, addr = next, addr != end); | |
268 | } | |
269 | ||
1378dc3d | 270 | static phys_addr_t pgd_pgtable_alloc(void) |
da141706 | 271 | { |
21ab99c2 | 272 | void *ptr = (void *)__get_free_page(PGALLOC_GFP); |
1378dc3d AB |
273 | if (!ptr || !pgtable_page_ctor(virt_to_page(ptr))) |
274 | BUG(); | |
21ab99c2 MR |
275 | |
276 | /* Ensure the zeroed page is visible to the page table walker */ | |
277 | dsb(ishst); | |
f4710445 | 278 | return __pa(ptr); |
da141706 LA |
279 | } |
280 | ||
132233a7 LA |
281 | /* |
282 | * This function can only be used to modify existing table entries, | |
283 | * without allocating new levels of table. Note that this permits the | |
284 | * creation of new section or page entries. | |
285 | */ | |
286 | static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt, | |
da141706 | 287 | phys_addr_t size, pgprot_t prot) |
d7ecbddf MS |
288 | { |
289 | if (virt < VMALLOC_START) { | |
290 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
291 | &phys, virt); | |
292 | return; | |
293 | } | |
53e1b329 | 294 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, true); |
d7ecbddf MS |
295 | } |
296 | ||
8ce837ce AB |
297 | void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, |
298 | unsigned long virt, phys_addr_t size, | |
53e1b329 | 299 | pgprot_t prot, bool allow_block_mappings) |
8ce837ce | 300 | { |
1378dc3d AB |
301 | BUG_ON(mm == &init_mm); |
302 | ||
11509a30 | 303 | __create_pgd_mapping(mm->pgd, phys, virt, size, prot, |
1378dc3d | 304 | pgd_pgtable_alloc, allow_block_mappings); |
d7ecbddf MS |
305 | } |
306 | ||
da141706 LA |
307 | static void create_mapping_late(phys_addr_t phys, unsigned long virt, |
308 | phys_addr_t size, pgprot_t prot) | |
309 | { | |
310 | if (virt < VMALLOC_START) { | |
311 | pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n", | |
312 | &phys, virt); | |
313 | return; | |
314 | } | |
315 | ||
11509a30 | 316 | __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, |
258a1605 | 317 | NULL, !debug_pagealloc_enabled()); |
da141706 LA |
318 | } |
319 | ||
068a17a5 | 320 | static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end) |
da141706 | 321 | { |
7eb90f2f | 322 | unsigned long kernel_start = __pa(_text); |
9fdc14c5 | 323 | unsigned long kernel_end = __pa(__init_begin); |
068a17a5 | 324 | |
da141706 | 325 | /* |
f9040773 AB |
326 | * Take care not to create a writable alias for the |
327 | * read-only text and rodata sections of the kernel image. | |
da141706 | 328 | */ |
068a17a5 | 329 | |
9fdc14c5 | 330 | /* No overlap with the kernel text/rodata */ |
068a17a5 MR |
331 | if (end < kernel_start || start >= kernel_end) { |
332 | __create_pgd_mapping(pgd, start, __phys_to_virt(start), | |
333 | end - start, PAGE_KERNEL, | |
53e1b329 AB |
334 | early_pgtable_alloc, |
335 | !debug_pagealloc_enabled()); | |
068a17a5 | 336 | return; |
da141706 LA |
337 | } |
338 | ||
068a17a5 | 339 | /* |
9fdc14c5 | 340 | * This block overlaps the kernel text/rodata mappings. |
f9040773 | 341 | * Map the portion(s) which don't overlap. |
068a17a5 MR |
342 | */ |
343 | if (start < kernel_start) | |
344 | __create_pgd_mapping(pgd, start, | |
345 | __phys_to_virt(start), | |
346 | kernel_start - start, PAGE_KERNEL, | |
53e1b329 AB |
347 | early_pgtable_alloc, |
348 | !debug_pagealloc_enabled()); | |
068a17a5 MR |
349 | if (kernel_end < end) |
350 | __create_pgd_mapping(pgd, kernel_end, | |
351 | __phys_to_virt(kernel_end), | |
352 | end - kernel_end, PAGE_KERNEL, | |
53e1b329 AB |
353 | early_pgtable_alloc, |
354 | !debug_pagealloc_enabled()); | |
f9040773 AB |
355 | |
356 | /* | |
9fdc14c5 | 357 | * Map the linear alias of the [_text, __init_begin) interval as |
f9040773 AB |
358 | * read-only/non-executable. This makes the contents of the |
359 | * region accessible to subsystems such as hibernate, but | |
360 | * protects it from inadvertent modification or execution. | |
361 | */ | |
362 | __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start), | |
363 | kernel_end - kernel_start, PAGE_KERNEL_RO, | |
53e1b329 | 364 | early_pgtable_alloc, !debug_pagealloc_enabled()); |
da141706 | 365 | } |
da141706 | 366 | |
068a17a5 | 367 | static void __init map_mem(pgd_t *pgd) |
c1cc1552 CM |
368 | { |
369 | struct memblock_region *reg; | |
f6bc87c3 | 370 | |
c1cc1552 CM |
371 | /* map all the memory banks */ |
372 | for_each_memblock(memory, reg) { | |
373 | phys_addr_t start = reg->base; | |
374 | phys_addr_t end = start + reg->size; | |
375 | ||
376 | if (start >= end) | |
377 | break; | |
68709f45 AB |
378 | if (memblock_is_nomap(reg)) |
379 | continue; | |
c1cc1552 | 380 | |
068a17a5 | 381 | __map_memblock(pgd, start, end); |
c1cc1552 CM |
382 | } |
383 | } | |
384 | ||
da141706 LA |
385 | void mark_rodata_ro(void) |
386 | { | |
2f39b5f9 | 387 | unsigned long section_size; |
f9040773 | 388 | |
9fdc14c5 | 389 | section_size = (unsigned long)_etext - (unsigned long)_text; |
7eb90f2f | 390 | create_mapping_late(__pa(_text), (unsigned long)_text, |
2f39b5f9 JL |
391 | section_size, PAGE_KERNEL_ROX); |
392 | /* | |
9fdc14c5 AB |
393 | * mark .rodata as read only. Use __init_begin rather than __end_rodata |
394 | * to cover NOTES and EXCEPTION_TABLE. | |
2f39b5f9 | 395 | */ |
9fdc14c5 | 396 | section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata; |
2f39b5f9 JL |
397 | create_mapping_late(__pa(__start_rodata), (unsigned long)__start_rodata, |
398 | section_size, PAGE_KERNEL_RO); | |
da141706 | 399 | } |
da141706 | 400 | |
2c09ec06 AB |
401 | static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end, |
402 | pgprot_t prot, struct vm_struct *vma) | |
068a17a5 MR |
403 | { |
404 | phys_addr_t pa_start = __pa(va_start); | |
405 | unsigned long size = va_end - va_start; | |
406 | ||
407 | BUG_ON(!PAGE_ALIGNED(pa_start)); | |
408 | BUG_ON(!PAGE_ALIGNED(size)); | |
409 | ||
410 | __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot, | |
53e1b329 | 411 | early_pgtable_alloc, !debug_pagealloc_enabled()); |
f9040773 AB |
412 | |
413 | vma->addr = va_start; | |
414 | vma->phys_addr = pa_start; | |
415 | vma->size = size; | |
416 | vma->flags = VM_MAP; | |
417 | vma->caller = __builtin_return_address(0); | |
418 | ||
419 | vm_area_add_early(vma); | |
068a17a5 MR |
420 | } |
421 | ||
422 | /* | |
423 | * Create fine-grained mappings for the kernel. | |
424 | */ | |
425 | static void __init map_kernel(pgd_t *pgd) | |
426 | { | |
2f39b5f9 | 427 | static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_init, vmlinux_data; |
068a17a5 | 428 | |
9fdc14c5 AB |
429 | map_kernel_segment(pgd, _text, _etext, PAGE_KERNEL_EXEC, &vmlinux_text); |
430 | map_kernel_segment(pgd, __start_rodata, __init_begin, PAGE_KERNEL, &vmlinux_rodata); | |
2c09ec06 AB |
431 | map_kernel_segment(pgd, __init_begin, __init_end, PAGE_KERNEL_EXEC, |
432 | &vmlinux_init); | |
433 | map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data); | |
068a17a5 | 434 | |
f9040773 AB |
435 | if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) { |
436 | /* | |
437 | * The fixmap falls in a separate pgd to the kernel, and doesn't | |
438 | * live in the carveout for the swapper_pg_dir. We can simply | |
439 | * re-use the existing dir for the fixmap. | |
440 | */ | |
441 | set_pgd(pgd_offset_raw(pgd, FIXADDR_START), | |
442 | *pgd_offset_k(FIXADDR_START)); | |
443 | } else if (CONFIG_PGTABLE_LEVELS > 3) { | |
444 | /* | |
445 | * The fixmap shares its top level pgd entry with the kernel | |
446 | * mapping. This can really only occur when we are running | |
447 | * with 16k/4 levels, so we can simply reuse the pud level | |
448 | * entry instead. | |
449 | */ | |
450 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
451 | set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START), | |
452 | __pud(__pa(bm_pmd) | PUD_TYPE_TABLE)); | |
453 | pud_clear_fixmap(); | |
454 | } else { | |
455 | BUG(); | |
456 | } | |
068a17a5 MR |
457 | |
458 | kasan_copy_shadow(pgd); | |
459 | } | |
460 | ||
c1cc1552 CM |
461 | /* |
462 | * paging_init() sets up the page tables, initialises the zone memory | |
463 | * maps and sets up the zero page. | |
464 | */ | |
465 | void __init paging_init(void) | |
466 | { | |
068a17a5 MR |
467 | phys_addr_t pgd_phys = early_pgtable_alloc(); |
468 | pgd_t *pgd = pgd_set_fixmap(pgd_phys); | |
469 | ||
470 | map_kernel(pgd); | |
471 | map_mem(pgd); | |
472 | ||
473 | /* | |
474 | * We want to reuse the original swapper_pg_dir so we don't have to | |
475 | * communicate the new address to non-coherent secondaries in | |
476 | * secondary_entry, and so cpu_switch_mm can generate the address with | |
477 | * adrp+add rather than a load from some global variable. | |
478 | * | |
479 | * To do this we need to go via a temporary pgd. | |
480 | */ | |
481 | cpu_replace_ttbr1(__va(pgd_phys)); | |
482 | memcpy(swapper_pg_dir, pgd, PAGE_SIZE); | |
483 | cpu_replace_ttbr1(swapper_pg_dir); | |
484 | ||
485 | pgd_clear_fixmap(); | |
486 | memblock_free(pgd_phys, PAGE_SIZE); | |
487 | ||
488 | /* | |
489 | * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd | |
490 | * allocated with it. | |
491 | */ | |
492 | memblock_free(__pa(swapper_pg_dir) + PAGE_SIZE, | |
493 | SWAPPER_DIR_SIZE - PAGE_SIZE); | |
c1cc1552 CM |
494 | } |
495 | ||
c1cc1552 CM |
496 | /* |
497 | * Check whether a kernel address is valid (derived from arch/x86/). | |
498 | */ | |
499 | int kern_addr_valid(unsigned long addr) | |
500 | { | |
501 | pgd_t *pgd; | |
502 | pud_t *pud; | |
503 | pmd_t *pmd; | |
504 | pte_t *pte; | |
505 | ||
506 | if ((((long)addr) >> VA_BITS) != -1UL) | |
507 | return 0; | |
508 | ||
509 | pgd = pgd_offset_k(addr); | |
510 | if (pgd_none(*pgd)) | |
511 | return 0; | |
512 | ||
513 | pud = pud_offset(pgd, addr); | |
514 | if (pud_none(*pud)) | |
515 | return 0; | |
516 | ||
206a2a73 SC |
517 | if (pud_sect(*pud)) |
518 | return pfn_valid(pud_pfn(*pud)); | |
519 | ||
c1cc1552 CM |
520 | pmd = pmd_offset(pud, addr); |
521 | if (pmd_none(*pmd)) | |
522 | return 0; | |
523 | ||
da6e4cb6 DA |
524 | if (pmd_sect(*pmd)) |
525 | return pfn_valid(pmd_pfn(*pmd)); | |
526 | ||
c1cc1552 CM |
527 | pte = pte_offset_kernel(pmd, addr); |
528 | if (pte_none(*pte)) | |
529 | return 0; | |
530 | ||
531 | return pfn_valid(pte_pfn(*pte)); | |
532 | } | |
533 | #ifdef CONFIG_SPARSEMEM_VMEMMAP | |
b433dce0 | 534 | #if !ARM64_SWAPPER_USES_SECTION_MAPS |
0aad818b | 535 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 536 | { |
0aad818b | 537 | return vmemmap_populate_basepages(start, end, node); |
c1cc1552 | 538 | } |
b433dce0 | 539 | #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ |
0aad818b | 540 | int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node) |
c1cc1552 | 541 | { |
0aad818b | 542 | unsigned long addr = start; |
c1cc1552 CM |
543 | unsigned long next; |
544 | pgd_t *pgd; | |
545 | pud_t *pud; | |
546 | pmd_t *pmd; | |
547 | ||
548 | do { | |
549 | next = pmd_addr_end(addr, end); | |
550 | ||
551 | pgd = vmemmap_pgd_populate(addr, node); | |
552 | if (!pgd) | |
553 | return -ENOMEM; | |
554 | ||
555 | pud = vmemmap_pud_populate(pgd, addr, node); | |
556 | if (!pud) | |
557 | return -ENOMEM; | |
558 | ||
559 | pmd = pmd_offset(pud, addr); | |
560 | if (pmd_none(*pmd)) { | |
561 | void *p = NULL; | |
562 | ||
563 | p = vmemmap_alloc_block_buf(PMD_SIZE, node); | |
564 | if (!p) | |
565 | return -ENOMEM; | |
566 | ||
a501e324 | 567 | set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL)); |
c1cc1552 CM |
568 | } else |
569 | vmemmap_verify((pte_t *)pmd, node, addr, next); | |
570 | } while (addr = next, addr != end); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | #endif /* CONFIG_ARM64_64K_PAGES */ | |
0aad818b | 575 | void vmemmap_free(unsigned long start, unsigned long end) |
0197518c TC |
576 | { |
577 | } | |
c1cc1552 | 578 | #endif /* CONFIG_SPARSEMEM_VMEMMAP */ |
af86e597 | 579 | |
af86e597 LA |
580 | static inline pud_t * fixmap_pud(unsigned long addr) |
581 | { | |
582 | pgd_t *pgd = pgd_offset_k(addr); | |
583 | ||
584 | BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); | |
585 | ||
157962f5 | 586 | return pud_offset_kimg(pgd, addr); |
af86e597 LA |
587 | } |
588 | ||
589 | static inline pmd_t * fixmap_pmd(unsigned long addr) | |
590 | { | |
591 | pud_t *pud = fixmap_pud(addr); | |
592 | ||
593 | BUG_ON(pud_none(*pud) || pud_bad(*pud)); | |
594 | ||
157962f5 | 595 | return pmd_offset_kimg(pud, addr); |
af86e597 LA |
596 | } |
597 | ||
598 | static inline pte_t * fixmap_pte(unsigned long addr) | |
599 | { | |
157962f5 | 600 | return &bm_pte[pte_index(addr)]; |
af86e597 LA |
601 | } |
602 | ||
603 | void __init early_fixmap_init(void) | |
604 | { | |
605 | pgd_t *pgd; | |
606 | pud_t *pud; | |
607 | pmd_t *pmd; | |
608 | unsigned long addr = FIXADDR_START; | |
609 | ||
610 | pgd = pgd_offset_k(addr); | |
f80fb3a3 AB |
611 | if (CONFIG_PGTABLE_LEVELS > 3 && |
612 | !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa(bm_pud))) { | |
f9040773 AB |
613 | /* |
614 | * We only end up here if the kernel mapping and the fixmap | |
615 | * share the top level pgd entry, which should only happen on | |
616 | * 16k/4 levels configurations. | |
617 | */ | |
618 | BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES)); | |
619 | pud = pud_offset_kimg(pgd, addr); | |
620 | } else { | |
621 | pgd_populate(&init_mm, pgd, bm_pud); | |
622 | pud = fixmap_pud(addr); | |
623 | } | |
af86e597 | 624 | pud_populate(&init_mm, pud, bm_pmd); |
157962f5 | 625 | pmd = fixmap_pmd(addr); |
af86e597 LA |
626 | pmd_populate_kernel(&init_mm, pmd, bm_pte); |
627 | ||
628 | /* | |
629 | * The boot-ioremap range spans multiple pmds, for which | |
157962f5 | 630 | * we are not prepared: |
af86e597 LA |
631 | */ |
632 | BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) | |
633 | != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); | |
634 | ||
635 | if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) | |
636 | || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { | |
637 | WARN_ON(1); | |
638 | pr_warn("pmd %p != %p, %p\n", | |
639 | pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), | |
640 | fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); | |
641 | pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", | |
642 | fix_to_virt(FIX_BTMAP_BEGIN)); | |
643 | pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", | |
644 | fix_to_virt(FIX_BTMAP_END)); | |
645 | ||
646 | pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); | |
647 | pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); | |
648 | } | |
649 | } | |
650 | ||
651 | void __set_fixmap(enum fixed_addresses idx, | |
652 | phys_addr_t phys, pgprot_t flags) | |
653 | { | |
654 | unsigned long addr = __fix_to_virt(idx); | |
655 | pte_t *pte; | |
656 | ||
b63dbef9 | 657 | BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); |
af86e597 LA |
658 | |
659 | pte = fixmap_pte(addr); | |
660 | ||
661 | if (pgprot_val(flags)) { | |
662 | set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); | |
663 | } else { | |
664 | pte_clear(&init_mm, addr, pte); | |
665 | flush_tlb_kernel_range(addr, addr+PAGE_SIZE); | |
666 | } | |
667 | } | |
61bd93ce | 668 | |
f80fb3a3 | 669 | void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot) |
61bd93ce AB |
670 | { |
671 | const u64 dt_virt_base = __fix_to_virt(FIX_FDT); | |
f80fb3a3 | 672 | int offset; |
61bd93ce AB |
673 | void *dt_virt; |
674 | ||
675 | /* | |
676 | * Check whether the physical FDT address is set and meets the minimum | |
677 | * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be | |
04a84810 AB |
678 | * at least 8 bytes so that we can always access the magic and size |
679 | * fields of the FDT header after mapping the first chunk, double check | |
680 | * here if that is indeed the case. | |
61bd93ce AB |
681 | */ |
682 | BUILD_BUG_ON(MIN_FDT_ALIGN < 8); | |
683 | if (!dt_phys || dt_phys % MIN_FDT_ALIGN) | |
684 | return NULL; | |
685 | ||
686 | /* | |
687 | * Make sure that the FDT region can be mapped without the need to | |
688 | * allocate additional translation table pages, so that it is safe | |
132233a7 | 689 | * to call create_mapping_noalloc() this early. |
61bd93ce AB |
690 | * |
691 | * On 64k pages, the FDT will be mapped using PTEs, so we need to | |
692 | * be in the same PMD as the rest of the fixmap. | |
693 | * On 4k pages, we'll use section mappings for the FDT so we only | |
694 | * have to be in the same PUD. | |
695 | */ | |
696 | BUILD_BUG_ON(dt_virt_base % SZ_2M); | |
697 | ||
b433dce0 SP |
698 | BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT != |
699 | __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT); | |
61bd93ce | 700 | |
b433dce0 | 701 | offset = dt_phys % SWAPPER_BLOCK_SIZE; |
61bd93ce AB |
702 | dt_virt = (void *)dt_virt_base + offset; |
703 | ||
704 | /* map the first chunk so we can read the size from the header */ | |
132233a7 LA |
705 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), |
706 | dt_virt_base, SWAPPER_BLOCK_SIZE, prot); | |
61bd93ce | 707 | |
04a84810 | 708 | if (fdt_magic(dt_virt) != FDT_MAGIC) |
61bd93ce AB |
709 | return NULL; |
710 | ||
f80fb3a3 AB |
711 | *size = fdt_totalsize(dt_virt); |
712 | if (*size > MAX_FDT_SIZE) | |
61bd93ce AB |
713 | return NULL; |
714 | ||
f80fb3a3 | 715 | if (offset + *size > SWAPPER_BLOCK_SIZE) |
132233a7 | 716 | create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base, |
f80fb3a3 | 717 | round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot); |
61bd93ce | 718 | |
f80fb3a3 AB |
719 | return dt_virt; |
720 | } | |
61bd93ce | 721 | |
f80fb3a3 AB |
722 | void *__init fixmap_remap_fdt(phys_addr_t dt_phys) |
723 | { | |
724 | void *dt_virt; | |
725 | int size; | |
726 | ||
727 | dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); | |
728 | if (!dt_virt) | |
729 | return NULL; | |
730 | ||
731 | memblock_reserve(dt_phys, size); | |
61bd93ce AB |
732 | return dt_virt; |
733 | } | |
324420bf AB |
734 | |
735 | int __init arch_ioremap_pud_supported(void) | |
736 | { | |
737 | /* only 4k granule supports level 1 block mappings */ | |
738 | return IS_ENABLED(CONFIG_ARM64_4K_PAGES); | |
739 | } | |
740 | ||
741 | int __init arch_ioremap_pmd_supported(void) | |
742 | { | |
743 | return 1; | |
744 | } | |
745 | ||
746 | int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot) | |
747 | { | |
748 | BUG_ON(phys & ~PUD_MASK); | |
749 | set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
750 | return 1; | |
751 | } | |
752 | ||
753 | int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot) | |
754 | { | |
755 | BUG_ON(phys & ~PMD_MASK); | |
756 | set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot)))); | |
757 | return 1; | |
758 | } | |
759 | ||
760 | int pud_clear_huge(pud_t *pud) | |
761 | { | |
762 | if (!pud_sect(*pud)) | |
763 | return 0; | |
764 | pud_clear(pud); | |
765 | return 1; | |
766 | } | |
767 | ||
768 | int pmd_clear_huge(pmd_t *pmd) | |
769 | { | |
770 | if (!pmd_sect(*pmd)) | |
771 | return 0; | |
772 | pmd_clear(pmd); | |
773 | return 1; | |
774 | } |