2 * Based on arch/arm/mm/mmu.c
4 * Copyright (C) 1995-2005 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
20 #include <linux/cache.h>
21 #include <linux/export.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/init.h>
25 #include <linux/libfdt.h>
26 #include <linux/mman.h>
27 #include <linux/nodemask.h>
28 #include <linux/memblock.h>
33 #include <asm/barrier.h>
34 #include <asm/cputype.h>
35 #include <asm/fixmap.h>
36 #include <asm/kasan.h>
37 #include <asm/kernel-pgtable.h>
38 #include <asm/sections.h>
39 #include <asm/setup.h>
40 #include <asm/sizes.h>
42 #include <asm/memblock.h>
43 #include <asm/mmu_context.h>
44 #include <asm/ptdump.h>
46 u64 idmap_t0sz
= TCR_T0SZ(VA_BITS
);
48 u64 kimage_voffset __ro_after_init
;
49 EXPORT_SYMBOL(kimage_voffset
);
52 * Empty_zero_page is a special page that is used for zero-initialized data
55 unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)] __page_aligned_bss
;
56 EXPORT_SYMBOL(empty_zero_page
);
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
;
62 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
63 unsigned long size
, pgprot_t vma_prot
)
66 return pgprot_noncached(vma_prot
);
67 else if (file
->f_flags
& O_SYNC
)
68 return pgprot_writecombine(vma_prot
);
71 EXPORT_SYMBOL(phys_mem_access_prot
);
73 static phys_addr_t __init
early_pgtable_alloc(void)
78 phys
= memblock_alloc(PAGE_SIZE
, PAGE_SIZE
);
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
85 ptr
= pte_set_fixmap(phys
);
87 memset(ptr
, 0, PAGE_SIZE
);
90 * Implicit barriers also ensure the zeroed page is visible to the page
98 static bool pgattr_change_is_safe(u64 old
, u64
new)
101 * The following mapping attributes may be updated in live
102 * kernel mappings without the need for break-before-make.
104 static const pteval_t mask
= PTE_PXN
| PTE_RDONLY
| PTE_WRITE
;
106 return old
== 0 || new == 0 || ((old
^ new) & ~mask
) == 0;
109 static void alloc_init_pte(pmd_t
*pmd
, unsigned long addr
,
110 unsigned long end
, unsigned long pfn
,
112 phys_addr_t (*pgtable_alloc
)(void))
116 BUG_ON(pmd_sect(*pmd
));
117 if (pmd_none(*pmd
)) {
118 phys_addr_t pte_phys
;
119 BUG_ON(!pgtable_alloc
);
120 pte_phys
= pgtable_alloc();
121 pte
= pte_set_fixmap(pte_phys
);
122 __pmd_populate(pmd
, pte_phys
, PMD_TYPE_TABLE
);
125 BUG_ON(pmd_bad(*pmd
));
127 pte
= pte_set_fixmap_offset(pmd
, addr
);
129 pte_t old_pte
= *pte
;
131 set_pte(pte
, pfn_pte(pfn
, prot
));
135 * After the PTE entry has been populated once, we
136 * only allow updates to the permission attributes.
138 BUG_ON(!pgattr_change_is_safe(pte_val(old_pte
), pte_val(*pte
)));
140 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
145 static void alloc_init_pmd(pud_t
*pud
, unsigned long addr
, unsigned long end
,
146 phys_addr_t phys
, pgprot_t prot
,
147 phys_addr_t (*pgtable_alloc
)(void),
148 bool page_mappings_only
)
154 * Check for initial section mappings in the pgd/pud and remove them.
156 BUG_ON(pud_sect(*pud
));
157 if (pud_none(*pud
)) {
158 phys_addr_t pmd_phys
;
159 BUG_ON(!pgtable_alloc
);
160 pmd_phys
= pgtable_alloc();
161 pmd
= pmd_set_fixmap(pmd_phys
);
162 __pud_populate(pud
, pmd_phys
, PUD_TYPE_TABLE
);
165 BUG_ON(pud_bad(*pud
));
167 pmd
= pmd_set_fixmap_offset(pud
, addr
);
169 pmd_t old_pmd
= *pmd
;
171 next
= pmd_addr_end(addr
, end
);
173 /* try section mapping first */
174 if (((addr
| next
| phys
) & ~SECTION_MASK
) == 0 &&
175 !page_mappings_only
) {
176 pmd_set_huge(pmd
, phys
, prot
);
179 * After the PMD entry has been populated once, we
180 * only allow updates to the permission attributes.
182 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd
),
185 alloc_init_pte(pmd
, addr
, next
, __phys_to_pfn(phys
),
186 prot
, pgtable_alloc
);
188 BUG_ON(pmd_val(old_pmd
) != 0 &&
189 pmd_val(old_pmd
) != pmd_val(*pmd
));
192 } while (pmd
++, addr
= next
, addr
!= end
);
197 static inline bool use_1G_block(unsigned long addr
, unsigned long next
,
200 if (PAGE_SHIFT
!= 12)
203 if (((addr
| next
| phys
) & ~PUD_MASK
) != 0)
209 static void alloc_init_pud(pgd_t
*pgd
, unsigned long addr
, unsigned long end
,
210 phys_addr_t phys
, pgprot_t prot
,
211 phys_addr_t (*pgtable_alloc
)(void),
212 bool page_mappings_only
)
217 if (pgd_none(*pgd
)) {
218 phys_addr_t pud_phys
;
219 BUG_ON(!pgtable_alloc
);
220 pud_phys
= pgtable_alloc();
221 __pgd_populate(pgd
, pud_phys
, PUD_TYPE_TABLE
);
223 BUG_ON(pgd_bad(*pgd
));
225 pud
= pud_set_fixmap_offset(pgd
, addr
);
227 pud_t old_pud
= *pud
;
229 next
= pud_addr_end(addr
, end
);
232 * For 4K granule only, attempt to put down a 1GB block
234 if (use_1G_block(addr
, next
, phys
) && !page_mappings_only
) {
235 pud_set_huge(pud
, phys
, prot
);
238 * After the PUD entry has been populated once, we
239 * only allow updates to the permission attributes.
241 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud
),
244 alloc_init_pmd(pud
, addr
, next
, phys
, prot
,
245 pgtable_alloc
, page_mappings_only
);
247 BUG_ON(pud_val(old_pud
) != 0 &&
248 pud_val(old_pud
) != pud_val(*pud
));
251 } while (pud
++, addr
= next
, addr
!= end
);
256 static void __create_pgd_mapping(pgd_t
*pgdir
, phys_addr_t phys
,
257 unsigned long virt
, phys_addr_t size
,
259 phys_addr_t (*pgtable_alloc
)(void),
260 bool page_mappings_only
)
262 unsigned long addr
, length
, end
, next
;
263 pgd_t
*pgd
= pgd_offset_raw(pgdir
, virt
);
266 * If the virtual and physical address don't have the same offset
267 * within a page, we cannot map the region as the caller expects.
269 if (WARN_ON((phys
^ virt
) & ~PAGE_MASK
))
273 addr
= virt
& PAGE_MASK
;
274 length
= PAGE_ALIGN(size
+ (virt
& ~PAGE_MASK
));
278 next
= pgd_addr_end(addr
, end
);
279 alloc_init_pud(pgd
, addr
, next
, phys
, prot
, pgtable_alloc
,
282 } while (pgd
++, addr
= next
, addr
!= end
);
285 static phys_addr_t
pgd_pgtable_alloc(void)
287 void *ptr
= (void *)__get_free_page(PGALLOC_GFP
);
288 if (!ptr
|| !pgtable_page_ctor(virt_to_page(ptr
)))
291 /* Ensure the zeroed page is visible to the page table walker */
297 * This function can only be used to modify existing table entries,
298 * without allocating new levels of table. Note that this permits the
299 * creation of new section or page entries.
301 static void __init
create_mapping_noalloc(phys_addr_t phys
, unsigned long virt
,
302 phys_addr_t size
, pgprot_t prot
)
304 if (virt
< VMALLOC_START
) {
305 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
309 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
, NULL
, false);
312 void __init
create_pgd_mapping(struct mm_struct
*mm
, phys_addr_t phys
,
313 unsigned long virt
, phys_addr_t size
,
314 pgprot_t prot
, bool page_mappings_only
)
316 BUG_ON(mm
== &init_mm
);
318 __create_pgd_mapping(mm
->pgd
, phys
, virt
, size
, prot
,
319 pgd_pgtable_alloc
, page_mappings_only
);
322 static void update_mapping_prot(phys_addr_t phys
, unsigned long virt
,
323 phys_addr_t size
, pgprot_t prot
)
325 if (virt
< VMALLOC_START
) {
326 pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
331 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
,
332 NULL
, debug_pagealloc_enabled());
334 /* flush the TLBs after updating live kernel mappings */
335 flush_tlb_kernel_range(virt
, virt
+ size
);
338 static void __init
__map_memblock(pgd_t
*pgd
, phys_addr_t start
, phys_addr_t end
)
340 phys_addr_t kernel_start
= __pa_symbol(_text
);
341 phys_addr_t kernel_end
= __pa_symbol(__init_begin
);
344 * Take care not to create a writable alias for the
345 * read-only text and rodata sections of the kernel image.
348 /* No overlap with the kernel text/rodata */
349 if (end
< kernel_start
|| start
>= kernel_end
) {
350 __create_pgd_mapping(pgd
, start
, __phys_to_virt(start
),
351 end
- start
, PAGE_KERNEL
,
353 debug_pagealloc_enabled());
358 * This block overlaps the kernel text/rodata mappings.
359 * Map the portion(s) which don't overlap.
361 if (start
< kernel_start
)
362 __create_pgd_mapping(pgd
, start
,
363 __phys_to_virt(start
),
364 kernel_start
- start
, PAGE_KERNEL
,
366 debug_pagealloc_enabled());
367 if (kernel_end
< end
)
368 __create_pgd_mapping(pgd
, kernel_end
,
369 __phys_to_virt(kernel_end
),
370 end
- kernel_end
, PAGE_KERNEL
,
372 debug_pagealloc_enabled());
375 * Map the linear alias of the [_text, __init_begin) interval
376 * as non-executable now, and remove the write permission in
377 * mark_linear_text_alias_ro() below (which will be called after
378 * alternative patching has completed). This makes the contents
379 * of the region accessible to subsystems such as hibernate,
380 * but protects it from inadvertent modification or execution.
382 __create_pgd_mapping(pgd
, kernel_start
, __phys_to_virt(kernel_start
),
383 kernel_end
- kernel_start
, PAGE_KERNEL
,
384 early_pgtable_alloc
, debug_pagealloc_enabled());
387 void __init
mark_linear_text_alias_ro(void)
390 * Remove the write permissions from the linear alias of .text/.rodata
392 update_mapping_prot(__pa_symbol(_text
), (unsigned long)lm_alias(_text
),
393 (unsigned long)__init_begin
- (unsigned long)_text
,
397 static void __init
map_mem(pgd_t
*pgd
)
399 struct memblock_region
*reg
;
401 /* map all the memory banks */
402 for_each_memblock(memory
, reg
) {
403 phys_addr_t start
= reg
->base
;
404 phys_addr_t end
= start
+ reg
->size
;
408 if (memblock_is_nomap(reg
))
411 __map_memblock(pgd
, start
, end
);
415 void mark_rodata_ro(void)
417 unsigned long section_size
;
419 section_size
= (unsigned long)_etext
- (unsigned long)_text
;
420 update_mapping_prot(__pa_symbol(_text
), (unsigned long)_text
,
421 section_size
, PAGE_KERNEL_ROX
);
423 * mark .rodata as read only. Use __init_begin rather than __end_rodata
424 * to cover NOTES and EXCEPTION_TABLE.
426 section_size
= (unsigned long)__init_begin
- (unsigned long)__start_rodata
;
427 update_mapping_prot(__pa_symbol(__start_rodata
), (unsigned long)__start_rodata
,
428 section_size
, PAGE_KERNEL_RO
);
433 static void __init
map_kernel_segment(pgd_t
*pgd
, void *va_start
, void *va_end
,
434 pgprot_t prot
, struct vm_struct
*vma
)
436 phys_addr_t pa_start
= __pa_symbol(va_start
);
437 unsigned long size
= va_end
- va_start
;
439 BUG_ON(!PAGE_ALIGNED(pa_start
));
440 BUG_ON(!PAGE_ALIGNED(size
));
442 __create_pgd_mapping(pgd
, pa_start
, (unsigned long)va_start
, size
, prot
,
443 early_pgtable_alloc
, debug_pagealloc_enabled());
445 vma
->addr
= va_start
;
446 vma
->phys_addr
= pa_start
;
449 vma
->caller
= __builtin_return_address(0);
451 vm_area_add_early(vma
);
455 * Create fine-grained mappings for the kernel.
457 static void __init
map_kernel(pgd_t
*pgd
)
459 static struct vm_struct vmlinux_text
, vmlinux_rodata
, vmlinux_init
, vmlinux_data
;
461 map_kernel_segment(pgd
, _text
, _etext
, PAGE_KERNEL_EXEC
, &vmlinux_text
);
462 map_kernel_segment(pgd
, __start_rodata
, __init_begin
, PAGE_KERNEL
, &vmlinux_rodata
);
463 map_kernel_segment(pgd
, __init_begin
, __init_end
, PAGE_KERNEL_EXEC
,
465 map_kernel_segment(pgd
, _data
, _end
, PAGE_KERNEL
, &vmlinux_data
);
467 if (!pgd_val(*pgd_offset_raw(pgd
, FIXADDR_START
))) {
469 * The fixmap falls in a separate pgd to the kernel, and doesn't
470 * live in the carveout for the swapper_pg_dir. We can simply
471 * re-use the existing dir for the fixmap.
473 set_pgd(pgd_offset_raw(pgd
, FIXADDR_START
),
474 *pgd_offset_k(FIXADDR_START
));
475 } else if (CONFIG_PGTABLE_LEVELS
> 3) {
477 * The fixmap shares its top level pgd entry with the kernel
478 * mapping. This can really only occur when we are running
479 * with 16k/4 levels, so we can simply reuse the pud level
482 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
483 set_pud(pud_set_fixmap_offset(pgd
, FIXADDR_START
),
484 __pud(__pa_symbol(bm_pmd
) | PUD_TYPE_TABLE
));
490 kasan_copy_shadow(pgd
);
494 * paging_init() sets up the page tables, initialises the zone memory
495 * maps and sets up the zero page.
497 void __init
paging_init(void)
499 phys_addr_t pgd_phys
= early_pgtable_alloc();
500 pgd_t
*pgd
= pgd_set_fixmap(pgd_phys
);
506 * We want to reuse the original swapper_pg_dir so we don't have to
507 * communicate the new address to non-coherent secondaries in
508 * secondary_entry, and so cpu_switch_mm can generate the address with
509 * adrp+add rather than a load from some global variable.
511 * To do this we need to go via a temporary pgd.
513 cpu_replace_ttbr1(__va(pgd_phys
));
514 memcpy(swapper_pg_dir
, pgd
, PGD_SIZE
);
515 cpu_replace_ttbr1(lm_alias(swapper_pg_dir
));
518 memblock_free(pgd_phys
, PAGE_SIZE
);
521 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
524 memblock_free(__pa_symbol(swapper_pg_dir
) + PAGE_SIZE
,
525 SWAPPER_DIR_SIZE
- PAGE_SIZE
);
529 * Check whether a kernel address is valid (derived from arch/x86/).
531 int kern_addr_valid(unsigned long addr
)
538 if ((((long)addr
) >> VA_BITS
) != -1UL)
541 pgd
= pgd_offset_k(addr
);
545 pud
= pud_offset(pgd
, addr
);
550 return pfn_valid(pud_pfn(*pud
));
552 pmd
= pmd_offset(pud
, addr
);
557 return pfn_valid(pmd_pfn(*pmd
));
559 pte
= pte_offset_kernel(pmd
, addr
);
563 return pfn_valid(pte_pfn(*pte
));
565 #ifdef CONFIG_SPARSEMEM_VMEMMAP
566 #if !ARM64_SWAPPER_USES_SECTION_MAPS
567 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
569 return vmemmap_populate_basepages(start
, end
, node
);
571 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
572 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
574 unsigned long addr
= start
;
581 next
= pmd_addr_end(addr
, end
);
583 pgd
= vmemmap_pgd_populate(addr
, node
);
587 pud
= vmemmap_pud_populate(pgd
, addr
, node
);
591 pmd
= pmd_offset(pud
, addr
);
592 if (pmd_none(*pmd
)) {
595 p
= vmemmap_alloc_block_buf(PMD_SIZE
, node
);
599 set_pmd(pmd
, __pmd(__pa(p
) | PROT_SECT_NORMAL
));
601 vmemmap_verify((pte_t
*)pmd
, node
, addr
, next
);
602 } while (addr
= next
, addr
!= end
);
606 #endif /* CONFIG_ARM64_64K_PAGES */
607 void vmemmap_free(unsigned long start
, unsigned long end
)
610 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
612 static inline pud_t
* fixmap_pud(unsigned long addr
)
614 pgd_t
*pgd
= pgd_offset_k(addr
);
616 BUG_ON(pgd_none(*pgd
) || pgd_bad(*pgd
));
618 return pud_offset_kimg(pgd
, addr
);
621 static inline pmd_t
* fixmap_pmd(unsigned long addr
)
623 pud_t
*pud
= fixmap_pud(addr
);
625 BUG_ON(pud_none(*pud
) || pud_bad(*pud
));
627 return pmd_offset_kimg(pud
, addr
);
630 static inline pte_t
* fixmap_pte(unsigned long addr
)
632 return &bm_pte
[pte_index(addr
)];
636 * The p*d_populate functions call virt_to_phys implicitly so they can't be used
637 * directly on kernel symbols (bm_p*d). This function is called too early to use
638 * lm_alias so __p*d_populate functions must be used to populate with the
639 * physical address from __pa_symbol.
641 void __init
early_fixmap_init(void)
646 unsigned long addr
= FIXADDR_START
;
648 pgd
= pgd_offset_k(addr
);
649 if (CONFIG_PGTABLE_LEVELS
> 3 &&
650 !(pgd_none(*pgd
) || pgd_page_paddr(*pgd
) == __pa_symbol(bm_pud
))) {
652 * We only end up here if the kernel mapping and the fixmap
653 * share the top level pgd entry, which should only happen on
654 * 16k/4 levels configurations.
656 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
657 pud
= pud_offset_kimg(pgd
, addr
);
660 __pgd_populate(pgd
, __pa_symbol(bm_pud
), PUD_TYPE_TABLE
);
661 pud
= fixmap_pud(addr
);
664 __pud_populate(pud
, __pa_symbol(bm_pmd
), PMD_TYPE_TABLE
);
665 pmd
= fixmap_pmd(addr
);
666 __pmd_populate(pmd
, __pa_symbol(bm_pte
), PMD_TYPE_TABLE
);
669 * The boot-ioremap range spans multiple pmds, for which
670 * we are not prepared:
672 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN
) >> PMD_SHIFT
)
673 != (__fix_to_virt(FIX_BTMAP_END
) >> PMD_SHIFT
));
675 if ((pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)))
676 || pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_END
))) {
678 pr_warn("pmd %p != %p, %p\n",
679 pmd
, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)),
680 fixmap_pmd(fix_to_virt(FIX_BTMAP_END
)));
681 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
682 fix_to_virt(FIX_BTMAP_BEGIN
));
683 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
684 fix_to_virt(FIX_BTMAP_END
));
686 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END
);
687 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN
);
691 void __set_fixmap(enum fixed_addresses idx
,
692 phys_addr_t phys
, pgprot_t flags
)
694 unsigned long addr
= __fix_to_virt(idx
);
697 BUG_ON(idx
<= FIX_HOLE
|| idx
>= __end_of_fixed_addresses
);
699 pte
= fixmap_pte(addr
);
701 if (pgprot_val(flags
)) {
702 set_pte(pte
, pfn_pte(phys
>> PAGE_SHIFT
, flags
));
704 pte_clear(&init_mm
, addr
, pte
);
705 flush_tlb_kernel_range(addr
, addr
+PAGE_SIZE
);
709 void *__init
__fixmap_remap_fdt(phys_addr_t dt_phys
, int *size
, pgprot_t prot
)
711 const u64 dt_virt_base
= __fix_to_virt(FIX_FDT
);
716 * Check whether the physical FDT address is set and meets the minimum
717 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
718 * at least 8 bytes so that we can always access the magic and size
719 * fields of the FDT header after mapping the first chunk, double check
720 * here if that is indeed the case.
722 BUILD_BUG_ON(MIN_FDT_ALIGN
< 8);
723 if (!dt_phys
|| dt_phys
% MIN_FDT_ALIGN
)
727 * Make sure that the FDT region can be mapped without the need to
728 * allocate additional translation table pages, so that it is safe
729 * to call create_mapping_noalloc() this early.
731 * On 64k pages, the FDT will be mapped using PTEs, so we need to
732 * be in the same PMD as the rest of the fixmap.
733 * On 4k pages, we'll use section mappings for the FDT so we only
734 * have to be in the same PUD.
736 BUILD_BUG_ON(dt_virt_base
% SZ_2M
);
738 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END
) >> SWAPPER_TABLE_SHIFT
!=
739 __fix_to_virt(FIX_BTMAP_BEGIN
) >> SWAPPER_TABLE_SHIFT
);
741 offset
= dt_phys
% SWAPPER_BLOCK_SIZE
;
742 dt_virt
= (void *)dt_virt_base
+ offset
;
744 /* map the first chunk so we can read the size from the header */
745 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
),
746 dt_virt_base
, SWAPPER_BLOCK_SIZE
, prot
);
748 if (fdt_magic(dt_virt
) != FDT_MAGIC
)
751 *size
= fdt_totalsize(dt_virt
);
752 if (*size
> MAX_FDT_SIZE
)
755 if (offset
+ *size
> SWAPPER_BLOCK_SIZE
)
756 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
), dt_virt_base
,
757 round_up(offset
+ *size
, SWAPPER_BLOCK_SIZE
), prot
);
762 void *__init
fixmap_remap_fdt(phys_addr_t dt_phys
)
767 dt_virt
= __fixmap_remap_fdt(dt_phys
, &size
, PAGE_KERNEL_RO
);
771 memblock_reserve(dt_phys
, size
);
775 int __init
arch_ioremap_pud_supported(void)
777 /* only 4k granule supports level 1 block mappings */
778 return IS_ENABLED(CONFIG_ARM64_4K_PAGES
);
781 int __init
arch_ioremap_pmd_supported(void)
786 int pud_set_huge(pud_t
*pud
, phys_addr_t phys
, pgprot_t prot
)
788 BUG_ON(phys
& ~PUD_MASK
);
789 set_pud(pud
, __pud(phys
| PUD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
793 int pmd_set_huge(pmd_t
*pmd
, phys_addr_t phys
, pgprot_t prot
)
795 BUG_ON(phys
& ~PMD_MASK
);
796 set_pmd(pmd
, __pmd(phys
| PMD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
800 int pud_clear_huge(pud_t
*pud
)
808 int pmd_clear_huge(pmd_t
*pmd
)