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/export.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/libfdt.h>
25 #include <linux/mman.h>
26 #include <linux/nodemask.h>
27 #include <linux/memblock.h>
30 #include <linux/slab.h>
31 #include <linux/stop_machine.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>
47 u64 idmap_t0sz
= TCR_T0SZ(VA_BITS
);
49 u64 kimage_voffset __read_mostly
;
50 EXPORT_SYMBOL(kimage_voffset
);
53 * Empty_zero_page is a special page that is used for zero-initialized data
56 unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)] __page_aligned_bss
;
57 EXPORT_SYMBOL(empty_zero_page
);
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
;
63 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
64 unsigned long size
, pgprot_t vma_prot
)
67 return pgprot_noncached(vma_prot
);
68 else if (file
->f_flags
& O_SYNC
)
69 return pgprot_writecombine(vma_prot
);
72 EXPORT_SYMBOL(phys_mem_access_prot
);
74 static phys_addr_t __init
early_pgtable_alloc(void)
79 phys
= memblock_alloc(PAGE_SIZE
, PAGE_SIZE
);
83 * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE
84 * slot will be free, so we can (ab)use the FIX_PTE slot to initialise
87 ptr
= pte_set_fixmap(phys
);
89 memset(ptr
, 0, PAGE_SIZE
);
92 * Implicit barriers also ensure the zeroed page is visible to the page
101 * remap a PMD into pages
103 static void split_pmd(pmd_t
*pmd
, pte_t
*pte
)
105 unsigned long pfn
= pmd_pfn(*pmd
);
110 * Need to have the least restrictive permissions available
111 * permissions will be fixed up later
113 set_pte(pte
, pfn_pte(pfn
, PAGE_KERNEL_EXEC
));
115 } while (pte
++, i
++, i
< PTRS_PER_PTE
);
118 static void alloc_init_pte(pmd_t
*pmd
, unsigned long addr
,
119 unsigned long end
, unsigned long pfn
,
121 phys_addr_t (*pgtable_alloc
)(void))
125 if (pmd_none(*pmd
) || pmd_sect(*pmd
)) {
126 phys_addr_t pte_phys
;
127 BUG_ON(!pgtable_alloc
);
128 pte_phys
= pgtable_alloc();
129 pte
= pte_set_fixmap(pte_phys
);
132 __pmd_populate(pmd
, pte_phys
, PMD_TYPE_TABLE
);
136 BUG_ON(pmd_bad(*pmd
));
138 pte
= pte_set_fixmap_offset(pmd
, addr
);
140 set_pte(pte
, pfn_pte(pfn
, prot
));
142 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
147 static void split_pud(pud_t
*old_pud
, pmd_t
*pmd
)
149 unsigned long addr
= pud_pfn(*old_pud
) << PAGE_SHIFT
;
150 pgprot_t prot
= __pgprot(pud_val(*old_pud
) ^ addr
);
154 set_pmd(pmd
, __pmd(addr
| pgprot_val(prot
)));
156 } while (pmd
++, i
++, i
< PTRS_PER_PMD
);
159 #ifdef CONFIG_DEBUG_PAGEALLOC
160 static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc
)(void))
164 * If debug_page_alloc is enabled we must map the linear map
165 * using pages. However, other mappings created by
166 * create_mapping_noalloc must use sections in some cases. Allow
167 * sections to be used in those cases, where no pgtable_alloc
168 * function is provided.
170 return !pgtable_alloc
|| !debug_pagealloc_enabled();
173 static bool block_mappings_allowed(phys_addr_t (*pgtable_alloc
)(void))
179 static void alloc_init_pmd(pud_t
*pud
, unsigned long addr
, unsigned long end
,
180 phys_addr_t phys
, pgprot_t prot
,
181 phys_addr_t (*pgtable_alloc
)(void))
187 * Check for initial section mappings in the pgd/pud and remove them.
189 if (pud_none(*pud
) || pud_sect(*pud
)) {
190 phys_addr_t pmd_phys
;
191 BUG_ON(!pgtable_alloc
);
192 pmd_phys
= pgtable_alloc();
193 pmd
= pmd_set_fixmap(pmd_phys
);
194 if (pud_sect(*pud
)) {
196 * need to have the 1G of mappings continue to be
201 __pud_populate(pud
, pmd_phys
, PUD_TYPE_TABLE
);
205 BUG_ON(pud_bad(*pud
));
207 pmd
= pmd_set_fixmap_offset(pud
, addr
);
209 next
= pmd_addr_end(addr
, end
);
210 /* try section mapping first */
211 if (((addr
| next
| phys
) & ~SECTION_MASK
) == 0 &&
212 block_mappings_allowed(pgtable_alloc
)) {
214 pmd_set_huge(pmd
, phys
, prot
);
216 * Check for previous table entries created during
217 * boot (__create_page_tables) and flush them.
219 if (!pmd_none(old_pmd
)) {
221 if (pmd_table(old_pmd
)) {
222 phys_addr_t table
= pmd_page_paddr(old_pmd
);
223 if (!WARN_ON_ONCE(slab_is_available()))
224 memblock_free(table
, PAGE_SIZE
);
228 alloc_init_pte(pmd
, addr
, next
, __phys_to_pfn(phys
),
229 prot
, pgtable_alloc
);
232 } while (pmd
++, addr
= next
, addr
!= end
);
237 static inline bool use_1G_block(unsigned long addr
, unsigned long next
,
240 if (PAGE_SHIFT
!= 12)
243 if (((addr
| next
| phys
) & ~PUD_MASK
) != 0)
249 static void alloc_init_pud(pgd_t
*pgd
, unsigned long addr
, unsigned long end
,
250 phys_addr_t phys
, pgprot_t prot
,
251 phys_addr_t (*pgtable_alloc
)(void))
256 if (pgd_none(*pgd
)) {
257 phys_addr_t pud_phys
;
258 BUG_ON(!pgtable_alloc
);
259 pud_phys
= pgtable_alloc();
260 __pgd_populate(pgd
, pud_phys
, PUD_TYPE_TABLE
);
262 BUG_ON(pgd_bad(*pgd
));
264 pud
= pud_set_fixmap_offset(pgd
, addr
);
266 next
= pud_addr_end(addr
, end
);
269 * For 4K granule only, attempt to put down a 1GB block
271 if (use_1G_block(addr
, next
, phys
) &&
272 block_mappings_allowed(pgtable_alloc
)) {
273 pud_t old_pud
= *pud
;
274 pud_set_huge(pud
, phys
, prot
);
277 * If we have an old value for a pud, it will
278 * be pointing to a pmd table that we no longer
279 * need (from swapper_pg_dir).
281 * Look up the old pmd table and free it.
283 if (!pud_none(old_pud
)) {
285 if (pud_table(old_pud
)) {
286 phys_addr_t table
= pud_page_paddr(old_pud
);
287 if (!WARN_ON_ONCE(slab_is_available()))
288 memblock_free(table
, PAGE_SIZE
);
292 alloc_init_pmd(pud
, addr
, next
, phys
, prot
,
296 } while (pud
++, addr
= next
, addr
!= end
);
302 * Create the page directory entries and any necessary page tables for the
303 * mapping specified by 'md'.
305 static void init_pgd(pgd_t
*pgd
, phys_addr_t phys
, unsigned long virt
,
306 phys_addr_t size
, pgprot_t prot
,
307 phys_addr_t (*pgtable_alloc
)(void))
309 unsigned long addr
, length
, end
, next
;
312 * If the virtual and physical address don't have the same offset
313 * within a page, we cannot map the region as the caller expects.
315 if (WARN_ON((phys
^ virt
) & ~PAGE_MASK
))
319 addr
= virt
& PAGE_MASK
;
320 length
= PAGE_ALIGN(size
+ (virt
& ~PAGE_MASK
));
324 next
= pgd_addr_end(addr
, end
);
325 alloc_init_pud(pgd
, addr
, next
, phys
, prot
, pgtable_alloc
);
327 } while (pgd
++, addr
= next
, addr
!= end
);
330 static phys_addr_t
late_pgtable_alloc(void)
332 void *ptr
= (void *)__get_free_page(PGALLOC_GFP
);
335 /* Ensure the zeroed page is visible to the page table walker */
340 static void __create_pgd_mapping(pgd_t
*pgdir
, phys_addr_t phys
,
341 unsigned long virt
, phys_addr_t size
,
343 phys_addr_t (*alloc
)(void))
345 init_pgd(pgd_offset_raw(pgdir
, virt
), phys
, virt
, size
, prot
, alloc
);
349 * This function can only be used to modify existing table entries,
350 * without allocating new levels of table. Note that this permits the
351 * creation of new section or page entries.
353 static void __init
create_mapping_noalloc(phys_addr_t phys
, unsigned long virt
,
354 phys_addr_t size
, pgprot_t prot
)
356 if (virt
< VMALLOC_START
) {
357 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
361 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
,
365 void __init
create_pgd_mapping(struct mm_struct
*mm
, phys_addr_t phys
,
366 unsigned long virt
, phys_addr_t size
,
369 __create_pgd_mapping(mm
->pgd
, phys
, virt
, size
, prot
,
373 static void create_mapping_late(phys_addr_t phys
, unsigned long virt
,
374 phys_addr_t size
, pgprot_t prot
)
376 if (virt
< VMALLOC_START
) {
377 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
382 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
,
386 static void __init
__map_memblock(pgd_t
*pgd
, phys_addr_t start
, phys_addr_t end
)
388 unsigned long kernel_start
= __pa(_stext
);
389 unsigned long kernel_end
= __pa(_etext
);
392 * Take care not to create a writable alias for the
393 * read-only text and rodata sections of the kernel image.
396 /* No overlap with the kernel text */
397 if (end
< kernel_start
|| start
>= kernel_end
) {
398 __create_pgd_mapping(pgd
, start
, __phys_to_virt(start
),
399 end
- start
, PAGE_KERNEL
,
400 early_pgtable_alloc
);
405 * This block overlaps the kernel text mapping.
406 * Map the portion(s) which don't overlap.
408 if (start
< kernel_start
)
409 __create_pgd_mapping(pgd
, start
,
410 __phys_to_virt(start
),
411 kernel_start
- start
, PAGE_KERNEL
,
412 early_pgtable_alloc
);
413 if (kernel_end
< end
)
414 __create_pgd_mapping(pgd
, kernel_end
,
415 __phys_to_virt(kernel_end
),
416 end
- kernel_end
, PAGE_KERNEL
,
417 early_pgtable_alloc
);
420 * Map the linear alias of the [_stext, _etext) interval as
421 * read-only/non-executable. This makes the contents of the
422 * region accessible to subsystems such as hibernate, but
423 * protects it from inadvertent modification or execution.
425 __create_pgd_mapping(pgd
, kernel_start
, __phys_to_virt(kernel_start
),
426 kernel_end
- kernel_start
, PAGE_KERNEL_RO
,
427 early_pgtable_alloc
);
430 static void __init
map_mem(pgd_t
*pgd
)
432 struct memblock_region
*reg
;
434 /* map all the memory banks */
435 for_each_memblock(memory
, reg
) {
436 phys_addr_t start
= reg
->base
;
437 phys_addr_t end
= start
+ reg
->size
;
441 if (memblock_is_nomap(reg
))
444 __map_memblock(pgd
, start
, end
);
448 void mark_rodata_ro(void)
450 unsigned long section_size
;
452 section_size
= (unsigned long)__start_rodata
- (unsigned long)_stext
;
453 create_mapping_late(__pa(_stext
), (unsigned long)_stext
,
454 section_size
, PAGE_KERNEL_ROX
);
456 * mark .rodata as read only. Use _etext rather than __end_rodata to
457 * cover NOTES and EXCEPTION_TABLE.
459 section_size
= (unsigned long)_etext
- (unsigned long)__start_rodata
;
460 create_mapping_late(__pa(__start_rodata
), (unsigned long)__start_rodata
,
461 section_size
, PAGE_KERNEL_RO
);
464 void fixup_init(void)
467 * Unmap the __init region but leave the VM area in place. This
468 * prevents the region from being reused for kernel modules, which
469 * is not supported by kallsyms.
471 unmap_kernel_range((u64
)__init_begin
, (u64
)(__init_end
- __init_begin
));
474 static void __init
map_kernel_chunk(pgd_t
*pgd
, void *va_start
, void *va_end
,
475 pgprot_t prot
, struct vm_struct
*vma
)
477 phys_addr_t pa_start
= __pa(va_start
);
478 unsigned long size
= va_end
- va_start
;
480 BUG_ON(!PAGE_ALIGNED(pa_start
));
481 BUG_ON(!PAGE_ALIGNED(size
));
483 __create_pgd_mapping(pgd
, pa_start
, (unsigned long)va_start
, size
, prot
,
484 early_pgtable_alloc
);
486 vma
->addr
= va_start
;
487 vma
->phys_addr
= pa_start
;
490 vma
->caller
= __builtin_return_address(0);
492 vm_area_add_early(vma
);
496 * Create fine-grained mappings for the kernel.
498 static void __init
map_kernel(pgd_t
*pgd
)
500 static struct vm_struct vmlinux_text
, vmlinux_rodata
, vmlinux_init
, vmlinux_data
;
502 map_kernel_chunk(pgd
, _stext
, __start_rodata
, PAGE_KERNEL_EXEC
, &vmlinux_text
);
503 map_kernel_chunk(pgd
, __start_rodata
, _etext
, PAGE_KERNEL
, &vmlinux_rodata
);
504 map_kernel_chunk(pgd
, __init_begin
, __init_end
, PAGE_KERNEL_EXEC
,
506 map_kernel_chunk(pgd
, _data
, _end
, PAGE_KERNEL
, &vmlinux_data
);
508 if (!pgd_val(*pgd_offset_raw(pgd
, FIXADDR_START
))) {
510 * The fixmap falls in a separate pgd to the kernel, and doesn't
511 * live in the carveout for the swapper_pg_dir. We can simply
512 * re-use the existing dir for the fixmap.
514 set_pgd(pgd_offset_raw(pgd
, FIXADDR_START
),
515 *pgd_offset_k(FIXADDR_START
));
516 } else if (CONFIG_PGTABLE_LEVELS
> 3) {
518 * The fixmap shares its top level pgd entry with the kernel
519 * mapping. This can really only occur when we are running
520 * with 16k/4 levels, so we can simply reuse the pud level
523 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
524 set_pud(pud_set_fixmap_offset(pgd
, FIXADDR_START
),
525 __pud(__pa(bm_pmd
) | PUD_TYPE_TABLE
));
531 kasan_copy_shadow(pgd
);
535 * paging_init() sets up the page tables, initialises the zone memory
536 * maps and sets up the zero page.
538 void __init
paging_init(void)
540 phys_addr_t pgd_phys
= early_pgtable_alloc();
541 pgd_t
*pgd
= pgd_set_fixmap(pgd_phys
);
547 * We want to reuse the original swapper_pg_dir so we don't have to
548 * communicate the new address to non-coherent secondaries in
549 * secondary_entry, and so cpu_switch_mm can generate the address with
550 * adrp+add rather than a load from some global variable.
552 * To do this we need to go via a temporary pgd.
554 cpu_replace_ttbr1(__va(pgd_phys
));
555 memcpy(swapper_pg_dir
, pgd
, PAGE_SIZE
);
556 cpu_replace_ttbr1(swapper_pg_dir
);
559 memblock_free(pgd_phys
, PAGE_SIZE
);
562 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
565 memblock_free(__pa(swapper_pg_dir
) + PAGE_SIZE
,
566 SWAPPER_DIR_SIZE
- PAGE_SIZE
);
572 * Check whether a kernel address is valid (derived from arch/x86/).
574 int kern_addr_valid(unsigned long addr
)
581 if ((((long)addr
) >> VA_BITS
) != -1UL)
584 pgd
= pgd_offset_k(addr
);
588 pud
= pud_offset(pgd
, addr
);
593 return pfn_valid(pud_pfn(*pud
));
595 pmd
= pmd_offset(pud
, addr
);
600 return pfn_valid(pmd_pfn(*pmd
));
602 pte
= pte_offset_kernel(pmd
, addr
);
606 return pfn_valid(pte_pfn(*pte
));
608 #ifdef CONFIG_SPARSEMEM_VMEMMAP
609 #if !ARM64_SWAPPER_USES_SECTION_MAPS
610 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
612 return vmemmap_populate_basepages(start
, end
, node
);
614 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
615 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
617 unsigned long addr
= start
;
624 next
= pmd_addr_end(addr
, end
);
626 pgd
= vmemmap_pgd_populate(addr
, node
);
630 pud
= vmemmap_pud_populate(pgd
, addr
, node
);
634 pmd
= pmd_offset(pud
, addr
);
635 if (pmd_none(*pmd
)) {
638 p
= vmemmap_alloc_block_buf(PMD_SIZE
, node
);
642 set_pmd(pmd
, __pmd(__pa(p
) | PROT_SECT_NORMAL
));
644 vmemmap_verify((pte_t
*)pmd
, node
, addr
, next
);
645 } while (addr
= next
, addr
!= end
);
649 #endif /* CONFIG_ARM64_64K_PAGES */
650 void vmemmap_free(unsigned long start
, unsigned long end
)
653 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
655 static inline pud_t
* fixmap_pud(unsigned long addr
)
657 pgd_t
*pgd
= pgd_offset_k(addr
);
659 BUG_ON(pgd_none(*pgd
) || pgd_bad(*pgd
));
661 return pud_offset_kimg(pgd
, addr
);
664 static inline pmd_t
* fixmap_pmd(unsigned long addr
)
666 pud_t
*pud
= fixmap_pud(addr
);
668 BUG_ON(pud_none(*pud
) || pud_bad(*pud
));
670 return pmd_offset_kimg(pud
, addr
);
673 static inline pte_t
* fixmap_pte(unsigned long addr
)
675 return &bm_pte
[pte_index(addr
)];
678 void __init
early_fixmap_init(void)
683 unsigned long addr
= FIXADDR_START
;
685 pgd
= pgd_offset_k(addr
);
686 if (CONFIG_PGTABLE_LEVELS
> 3 &&
687 !(pgd_none(*pgd
) || pgd_page_paddr(*pgd
) == __pa(bm_pud
))) {
689 * We only end up here if the kernel mapping and the fixmap
690 * share the top level pgd entry, which should only happen on
691 * 16k/4 levels configurations.
693 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
694 pud
= pud_offset_kimg(pgd
, addr
);
696 pgd_populate(&init_mm
, pgd
, bm_pud
);
697 pud
= fixmap_pud(addr
);
699 pud_populate(&init_mm
, pud
, bm_pmd
);
700 pmd
= fixmap_pmd(addr
);
701 pmd_populate_kernel(&init_mm
, pmd
, bm_pte
);
704 * The boot-ioremap range spans multiple pmds, for which
705 * we are not prepared:
707 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN
) >> PMD_SHIFT
)
708 != (__fix_to_virt(FIX_BTMAP_END
) >> PMD_SHIFT
));
710 if ((pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)))
711 || pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_END
))) {
713 pr_warn("pmd %p != %p, %p\n",
714 pmd
, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)),
715 fixmap_pmd(fix_to_virt(FIX_BTMAP_END
)));
716 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
717 fix_to_virt(FIX_BTMAP_BEGIN
));
718 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
719 fix_to_virt(FIX_BTMAP_END
));
721 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END
);
722 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN
);
726 void __set_fixmap(enum fixed_addresses idx
,
727 phys_addr_t phys
, pgprot_t flags
)
729 unsigned long addr
= __fix_to_virt(idx
);
732 BUG_ON(idx
<= FIX_HOLE
|| idx
>= __end_of_fixed_addresses
);
734 pte
= fixmap_pte(addr
);
736 if (pgprot_val(flags
)) {
737 set_pte(pte
, pfn_pte(phys
>> PAGE_SHIFT
, flags
));
739 pte_clear(&init_mm
, addr
, pte
);
740 flush_tlb_kernel_range(addr
, addr
+PAGE_SIZE
);
744 void *__init
__fixmap_remap_fdt(phys_addr_t dt_phys
, int *size
, pgprot_t prot
)
746 const u64 dt_virt_base
= __fix_to_virt(FIX_FDT
);
751 * Check whether the physical FDT address is set and meets the minimum
752 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
753 * at least 8 bytes so that we can always access the size field of the
754 * FDT header after mapping the first chunk, double check here if that
755 * is indeed the case.
757 BUILD_BUG_ON(MIN_FDT_ALIGN
< 8);
758 if (!dt_phys
|| dt_phys
% MIN_FDT_ALIGN
)
762 * Make sure that the FDT region can be mapped without the need to
763 * allocate additional translation table pages, so that it is safe
764 * to call create_mapping_noalloc() this early.
766 * On 64k pages, the FDT will be mapped using PTEs, so we need to
767 * be in the same PMD as the rest of the fixmap.
768 * On 4k pages, we'll use section mappings for the FDT so we only
769 * have to be in the same PUD.
771 BUILD_BUG_ON(dt_virt_base
% SZ_2M
);
773 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END
) >> SWAPPER_TABLE_SHIFT
!=
774 __fix_to_virt(FIX_BTMAP_BEGIN
) >> SWAPPER_TABLE_SHIFT
);
776 offset
= dt_phys
% SWAPPER_BLOCK_SIZE
;
777 dt_virt
= (void *)dt_virt_base
+ offset
;
779 /* map the first chunk so we can read the size from the header */
780 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
),
781 dt_virt_base
, SWAPPER_BLOCK_SIZE
, prot
);
783 if (fdt_check_header(dt_virt
) != 0)
786 *size
= fdt_totalsize(dt_virt
);
787 if (*size
> MAX_FDT_SIZE
)
790 if (offset
+ *size
> SWAPPER_BLOCK_SIZE
)
791 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
), dt_virt_base
,
792 round_up(offset
+ *size
, SWAPPER_BLOCK_SIZE
), prot
);
797 void *__init
fixmap_remap_fdt(phys_addr_t dt_phys
)
802 dt_virt
= __fixmap_remap_fdt(dt_phys
, &size
, PAGE_KERNEL_RO
);
806 memblock_reserve(dt_phys
, size
);
810 int __init
arch_ioremap_pud_supported(void)
812 /* only 4k granule supports level 1 block mappings */
813 return IS_ENABLED(CONFIG_ARM64_4K_PAGES
);
816 int __init
arch_ioremap_pmd_supported(void)
821 int pud_set_huge(pud_t
*pud
, phys_addr_t phys
, pgprot_t prot
)
823 BUG_ON(phys
& ~PUD_MASK
);
824 set_pud(pud
, __pud(phys
| PUD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
828 int pmd_set_huge(pmd_t
*pmd
, phys_addr_t phys
, pgprot_t prot
)
830 BUG_ON(phys
& ~PMD_MASK
);
831 set_pmd(pmd
, __pmd(phys
| PMD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
835 int pud_clear_huge(pud_t
*pud
)
843 int pmd_clear_huge(pmd_t
*pmd
)