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/ioport.h>
26 #include <linux/kexec.h>
27 #include <linux/libfdt.h>
28 #include <linux/mman.h>
29 #include <linux/nodemask.h>
30 #include <linux/memblock.h>
34 #include <asm/barrier.h>
35 #include <asm/cputype.h>
36 #include <asm/fixmap.h>
37 #include <asm/kasan.h>
38 #include <asm/kernel-pgtable.h>
39 #include <asm/sections.h>
40 #include <asm/setup.h>
41 #include <asm/sizes.h>
43 #include <asm/memblock.h>
44 #include <asm/mmu_context.h>
45 #include <asm/ptdump.h>
47 u64 idmap_t0sz
= TCR_T0SZ(VA_BITS
);
49 u64 kimage_voffset __ro_after_init
;
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
);
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
86 ptr
= pte_set_fixmap(phys
);
88 memset(ptr
, 0, PAGE_SIZE
);
91 * Implicit barriers also ensure the zeroed page is visible to the page
99 static bool pgattr_change_is_safe(u64 old
, u64
new)
102 * The following mapping attributes may be updated in live
103 * kernel mappings without the need for break-before-make.
105 static const pteval_t mask
= PTE_PXN
| PTE_RDONLY
| PTE_WRITE
;
107 return old
== 0 || new == 0 || ((old
^ new) & ~mask
) == 0;
110 static void alloc_init_pte(pmd_t
*pmd
, unsigned long addr
,
111 unsigned long end
, unsigned long pfn
,
113 phys_addr_t (*pgtable_alloc
)(void))
117 BUG_ON(pmd_sect(*pmd
));
118 if (pmd_none(*pmd
)) {
119 phys_addr_t pte_phys
;
120 BUG_ON(!pgtable_alloc
);
121 pte_phys
= pgtable_alloc();
122 pte
= pte_set_fixmap(pte_phys
);
123 __pmd_populate(pmd
, pte_phys
, PMD_TYPE_TABLE
);
126 BUG_ON(pmd_bad(*pmd
));
128 pte
= pte_set_fixmap_offset(pmd
, addr
);
130 pte_t old_pte
= *pte
;
132 set_pte(pte
, pfn_pte(pfn
, prot
));
136 * After the PTE entry has been populated once, we
137 * only allow updates to the permission attributes.
139 BUG_ON(!pgattr_change_is_safe(pte_val(old_pte
), pte_val(*pte
)));
141 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
146 static void alloc_init_pmd(pud_t
*pud
, unsigned long addr
, unsigned long end
,
147 phys_addr_t phys
, pgprot_t prot
,
148 phys_addr_t (*pgtable_alloc
)(void),
149 bool page_mappings_only
)
155 * Check for initial section mappings in the pgd/pud and remove them.
157 BUG_ON(pud_sect(*pud
));
158 if (pud_none(*pud
)) {
159 phys_addr_t pmd_phys
;
160 BUG_ON(!pgtable_alloc
);
161 pmd_phys
= pgtable_alloc();
162 pmd
= pmd_set_fixmap(pmd_phys
);
163 __pud_populate(pud
, pmd_phys
, PUD_TYPE_TABLE
);
166 BUG_ON(pud_bad(*pud
));
168 pmd
= pmd_set_fixmap_offset(pud
, addr
);
170 pmd_t old_pmd
= *pmd
;
172 next
= pmd_addr_end(addr
, end
);
174 /* try section mapping first */
175 if (((addr
| next
| phys
) & ~SECTION_MASK
) == 0 &&
176 !page_mappings_only
) {
177 pmd_set_huge(pmd
, phys
, prot
);
180 * After the PMD entry has been populated once, we
181 * only allow updates to the permission attributes.
183 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd
),
186 alloc_init_pte(pmd
, addr
, next
, __phys_to_pfn(phys
),
187 prot
, pgtable_alloc
);
189 BUG_ON(pmd_val(old_pmd
) != 0 &&
190 pmd_val(old_pmd
) != pmd_val(*pmd
));
193 } while (pmd
++, addr
= next
, addr
!= end
);
198 static inline bool use_1G_block(unsigned long addr
, unsigned long next
,
201 if (PAGE_SHIFT
!= 12)
204 if (((addr
| next
| phys
) & ~PUD_MASK
) != 0)
210 static void alloc_init_pud(pgd_t
*pgd
, unsigned long addr
, unsigned long end
,
211 phys_addr_t phys
, pgprot_t prot
,
212 phys_addr_t (*pgtable_alloc
)(void),
213 bool page_mappings_only
)
218 if (pgd_none(*pgd
)) {
219 phys_addr_t pud_phys
;
220 BUG_ON(!pgtable_alloc
);
221 pud_phys
= pgtable_alloc();
222 __pgd_populate(pgd
, pud_phys
, PUD_TYPE_TABLE
);
224 BUG_ON(pgd_bad(*pgd
));
226 pud
= pud_set_fixmap_offset(pgd
, addr
);
228 pud_t old_pud
= *pud
;
230 next
= pud_addr_end(addr
, end
);
233 * For 4K granule only, attempt to put down a 1GB block
235 if (use_1G_block(addr
, next
, phys
) && !page_mappings_only
) {
236 pud_set_huge(pud
, phys
, prot
);
239 * After the PUD entry has been populated once, we
240 * only allow updates to the permission attributes.
242 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud
),
245 alloc_init_pmd(pud
, addr
, next
, phys
, prot
,
246 pgtable_alloc
, page_mappings_only
);
248 BUG_ON(pud_val(old_pud
) != 0 &&
249 pud_val(old_pud
) != pud_val(*pud
));
252 } while (pud
++, addr
= next
, addr
!= end
);
257 static void __create_pgd_mapping(pgd_t
*pgdir
, phys_addr_t phys
,
258 unsigned long virt
, phys_addr_t size
,
260 phys_addr_t (*pgtable_alloc
)(void),
261 bool page_mappings_only
)
263 unsigned long addr
, length
, end
, next
;
264 pgd_t
*pgd
= pgd_offset_raw(pgdir
, virt
);
267 * If the virtual and physical address don't have the same offset
268 * within a page, we cannot map the region as the caller expects.
270 if (WARN_ON((phys
^ virt
) & ~PAGE_MASK
))
274 addr
= virt
& PAGE_MASK
;
275 length
= PAGE_ALIGN(size
+ (virt
& ~PAGE_MASK
));
279 next
= pgd_addr_end(addr
, end
);
280 alloc_init_pud(pgd
, addr
, next
, phys
, prot
, pgtable_alloc
,
283 } while (pgd
++, addr
= next
, addr
!= end
);
286 static phys_addr_t
pgd_pgtable_alloc(void)
288 void *ptr
= (void *)__get_free_page(PGALLOC_GFP
);
289 if (!ptr
|| !pgtable_page_ctor(virt_to_page(ptr
)))
292 /* Ensure the zeroed page is visible to the page table walker */
298 * This function can only be used to modify existing table entries,
299 * without allocating new levels of table. Note that this permits the
300 * creation of new section or page entries.
302 static void __init
create_mapping_noalloc(phys_addr_t phys
, unsigned long virt
,
303 phys_addr_t size
, pgprot_t prot
)
305 if (virt
< VMALLOC_START
) {
306 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
310 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
, NULL
, false);
313 void __init
create_pgd_mapping(struct mm_struct
*mm
, phys_addr_t phys
,
314 unsigned long virt
, phys_addr_t size
,
315 pgprot_t prot
, bool page_mappings_only
)
317 BUG_ON(mm
== &init_mm
);
319 __create_pgd_mapping(mm
->pgd
, phys
, virt
, size
, prot
,
320 pgd_pgtable_alloc
, page_mappings_only
);
323 static void create_mapping_late(phys_addr_t phys
, unsigned long virt
,
324 phys_addr_t size
, pgprot_t prot
)
326 if (virt
< VMALLOC_START
) {
327 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
332 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
,
333 NULL
, debug_pagealloc_enabled());
336 static void __init
__map_memblock(pgd_t
*pgd
, phys_addr_t start
,
337 phys_addr_t end
, pgprot_t prot
,
338 bool page_mappings_only
)
340 __create_pgd_mapping(pgd
, start
, __phys_to_virt(start
), end
- start
,
341 prot
, early_pgtable_alloc
,
345 static void __init
map_mem(pgd_t
*pgd
)
347 phys_addr_t kernel_start
= __pa(_text
);
348 phys_addr_t kernel_end
= __pa(__init_begin
);
349 struct memblock_region
*reg
;
352 * Temporarily marked as NOMAP to skip mapping in the next for-loop
354 memblock_mark_nomap(kernel_start
, kernel_end
- kernel_start
);
356 #ifdef CONFIG_KEXEC_CORE
358 memblock_mark_nomap(crashk_res
.start
,
359 resource_size(&crashk_res
));
362 /* map all the memory banks */
363 for_each_memblock(memory
, reg
) {
364 phys_addr_t start
= reg
->base
;
365 phys_addr_t end
= start
+ reg
->size
;
369 if (memblock_is_nomap(reg
))
372 __map_memblock(pgd
, start
, end
,
373 PAGE_KERNEL
, debug_pagealloc_enabled());
377 * Map the linear alias of the [_text, __init_begin) interval as
378 * read-only/non-executable. This makes the contents of the
379 * region accessible to subsystems such as hibernate, but
380 * protects it from inadvertent modification or execution.
382 __map_memblock(pgd
, kernel_start
, kernel_end
,
383 PAGE_KERNEL_RO
, debug_pagealloc_enabled());
384 memblock_clear_nomap(kernel_start
, kernel_end
- kernel_start
);
386 #ifdef CONFIG_KEXEC_CORE
388 * User page-level mappings here so that we can shrink the region
389 * in page granularity and put back unused memory to buddy system
390 * through /sys/kernel/kexec_crash_size interface.
392 if (crashk_res
.end
) {
393 __map_memblock(pgd
, crashk_res
.start
, crashk_res
.end
+ 1,
395 memblock_clear_nomap(crashk_res
.start
,
396 resource_size(&crashk_res
));
401 void mark_rodata_ro(void)
403 unsigned long section_size
;
405 section_size
= (unsigned long)_etext
- (unsigned long)_text
;
406 create_mapping_late(__pa(_text
), (unsigned long)_text
,
407 section_size
, PAGE_KERNEL_ROX
);
409 * mark .rodata as read only. Use __init_begin rather than __end_rodata
410 * to cover NOTES and EXCEPTION_TABLE.
412 section_size
= (unsigned long)__init_begin
- (unsigned long)__start_rodata
;
413 create_mapping_late(__pa(__start_rodata
), (unsigned long)__start_rodata
,
414 section_size
, PAGE_KERNEL_RO
);
416 /* flush the TLBs after updating live kernel mappings */
422 static void __init
map_kernel_segment(pgd_t
*pgd
, void *va_start
, void *va_end
,
423 pgprot_t prot
, struct vm_struct
*vma
)
425 phys_addr_t pa_start
= __pa(va_start
);
426 unsigned long size
= va_end
- va_start
;
428 BUG_ON(!PAGE_ALIGNED(pa_start
));
429 BUG_ON(!PAGE_ALIGNED(size
));
431 __create_pgd_mapping(pgd
, pa_start
, (unsigned long)va_start
, size
, prot
,
432 early_pgtable_alloc
, debug_pagealloc_enabled());
434 vma
->addr
= va_start
;
435 vma
->phys_addr
= pa_start
;
438 vma
->caller
= __builtin_return_address(0);
440 vm_area_add_early(vma
);
444 * Create fine-grained mappings for the kernel.
446 static void __init
map_kernel(pgd_t
*pgd
)
448 static struct vm_struct vmlinux_text
, vmlinux_rodata
, vmlinux_init
, vmlinux_data
;
450 map_kernel_segment(pgd
, _text
, _etext
, PAGE_KERNEL_EXEC
, &vmlinux_text
);
451 map_kernel_segment(pgd
, __start_rodata
, __init_begin
, PAGE_KERNEL
, &vmlinux_rodata
);
452 map_kernel_segment(pgd
, __init_begin
, __init_end
, PAGE_KERNEL_EXEC
,
454 map_kernel_segment(pgd
, _data
, _end
, PAGE_KERNEL
, &vmlinux_data
);
456 if (!pgd_val(*pgd_offset_raw(pgd
, FIXADDR_START
))) {
458 * The fixmap falls in a separate pgd to the kernel, and doesn't
459 * live in the carveout for the swapper_pg_dir. We can simply
460 * re-use the existing dir for the fixmap.
462 set_pgd(pgd_offset_raw(pgd
, FIXADDR_START
),
463 *pgd_offset_k(FIXADDR_START
));
464 } else if (CONFIG_PGTABLE_LEVELS
> 3) {
466 * The fixmap shares its top level pgd entry with the kernel
467 * mapping. This can really only occur when we are running
468 * with 16k/4 levels, so we can simply reuse the pud level
471 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
472 set_pud(pud_set_fixmap_offset(pgd
, FIXADDR_START
),
473 __pud(__pa(bm_pmd
) | PUD_TYPE_TABLE
));
479 kasan_copy_shadow(pgd
);
483 * paging_init() sets up the page tables, initialises the zone memory
484 * maps and sets up the zero page.
486 void __init
paging_init(void)
488 phys_addr_t pgd_phys
= early_pgtable_alloc();
489 pgd_t
*pgd
= pgd_set_fixmap(pgd_phys
);
495 * We want to reuse the original swapper_pg_dir so we don't have to
496 * communicate the new address to non-coherent secondaries in
497 * secondary_entry, and so cpu_switch_mm can generate the address with
498 * adrp+add rather than a load from some global variable.
500 * To do this we need to go via a temporary pgd.
502 cpu_replace_ttbr1(__va(pgd_phys
));
503 memcpy(swapper_pg_dir
, pgd
, PAGE_SIZE
);
504 cpu_replace_ttbr1(swapper_pg_dir
);
507 memblock_free(pgd_phys
, PAGE_SIZE
);
510 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
513 memblock_free(__pa(swapper_pg_dir
) + PAGE_SIZE
,
514 SWAPPER_DIR_SIZE
- PAGE_SIZE
);
518 * Check whether a kernel address is valid (derived from arch/x86/).
520 int kern_addr_valid(unsigned long addr
)
527 if ((((long)addr
) >> VA_BITS
) != -1UL)
530 pgd
= pgd_offset_k(addr
);
534 pud
= pud_offset(pgd
, addr
);
539 return pfn_valid(pud_pfn(*pud
));
541 pmd
= pmd_offset(pud
, addr
);
546 return pfn_valid(pmd_pfn(*pmd
));
548 pte
= pte_offset_kernel(pmd
, addr
);
552 return pfn_valid(pte_pfn(*pte
));
554 #ifdef CONFIG_SPARSEMEM_VMEMMAP
555 #if !ARM64_SWAPPER_USES_SECTION_MAPS
556 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
558 return vmemmap_populate_basepages(start
, end
, node
);
560 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
561 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
563 unsigned long addr
= start
;
570 next
= pmd_addr_end(addr
, end
);
572 pgd
= vmemmap_pgd_populate(addr
, node
);
576 pud
= vmemmap_pud_populate(pgd
, addr
, node
);
580 pmd
= pmd_offset(pud
, addr
);
581 if (pmd_none(*pmd
)) {
584 p
= vmemmap_alloc_block_buf(PMD_SIZE
, node
);
588 set_pmd(pmd
, __pmd(__pa(p
) | PROT_SECT_NORMAL
));
590 vmemmap_verify((pte_t
*)pmd
, node
, addr
, next
);
591 } while (addr
= next
, addr
!= end
);
595 #endif /* CONFIG_ARM64_64K_PAGES */
596 void vmemmap_free(unsigned long start
, unsigned long end
)
599 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
601 static inline pud_t
* fixmap_pud(unsigned long addr
)
603 pgd_t
*pgd
= pgd_offset_k(addr
);
605 BUG_ON(pgd_none(*pgd
) || pgd_bad(*pgd
));
607 return pud_offset_kimg(pgd
, addr
);
610 static inline pmd_t
* fixmap_pmd(unsigned long addr
)
612 pud_t
*pud
= fixmap_pud(addr
);
614 BUG_ON(pud_none(*pud
) || pud_bad(*pud
));
616 return pmd_offset_kimg(pud
, addr
);
619 static inline pte_t
* fixmap_pte(unsigned long addr
)
621 return &bm_pte
[pte_index(addr
)];
624 void __init
early_fixmap_init(void)
629 unsigned long addr
= FIXADDR_START
;
631 pgd
= pgd_offset_k(addr
);
632 if (CONFIG_PGTABLE_LEVELS
> 3 &&
633 !(pgd_none(*pgd
) || pgd_page_paddr(*pgd
) == __pa(bm_pud
))) {
635 * We only end up here if the kernel mapping and the fixmap
636 * share the top level pgd entry, which should only happen on
637 * 16k/4 levels configurations.
639 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
640 pud
= pud_offset_kimg(pgd
, addr
);
642 pgd_populate(&init_mm
, pgd
, bm_pud
);
643 pud
= fixmap_pud(addr
);
645 pud_populate(&init_mm
, pud
, bm_pmd
);
646 pmd
= fixmap_pmd(addr
);
647 pmd_populate_kernel(&init_mm
, pmd
, bm_pte
);
650 * The boot-ioremap range spans multiple pmds, for which
651 * we are not prepared:
653 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN
) >> PMD_SHIFT
)
654 != (__fix_to_virt(FIX_BTMAP_END
) >> PMD_SHIFT
));
656 if ((pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)))
657 || pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_END
))) {
659 pr_warn("pmd %p != %p, %p\n",
660 pmd
, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)),
661 fixmap_pmd(fix_to_virt(FIX_BTMAP_END
)));
662 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
663 fix_to_virt(FIX_BTMAP_BEGIN
));
664 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
665 fix_to_virt(FIX_BTMAP_END
));
667 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END
);
668 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN
);
672 void __set_fixmap(enum fixed_addresses idx
,
673 phys_addr_t phys
, pgprot_t flags
)
675 unsigned long addr
= __fix_to_virt(idx
);
678 BUG_ON(idx
<= FIX_HOLE
|| idx
>= __end_of_fixed_addresses
);
680 pte
= fixmap_pte(addr
);
682 if (pgprot_val(flags
)) {
683 set_pte(pte
, pfn_pte(phys
>> PAGE_SHIFT
, flags
));
685 pte_clear(&init_mm
, addr
, pte
);
686 flush_tlb_kernel_range(addr
, addr
+PAGE_SIZE
);
690 void *__init
__fixmap_remap_fdt(phys_addr_t dt_phys
, int *size
, pgprot_t prot
)
692 const u64 dt_virt_base
= __fix_to_virt(FIX_FDT
);
697 * Check whether the physical FDT address is set and meets the minimum
698 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
699 * at least 8 bytes so that we can always access the magic and size
700 * fields of the FDT header after mapping the first chunk, double check
701 * here if that is indeed the case.
703 BUILD_BUG_ON(MIN_FDT_ALIGN
< 8);
704 if (!dt_phys
|| dt_phys
% MIN_FDT_ALIGN
)
708 * Make sure that the FDT region can be mapped without the need to
709 * allocate additional translation table pages, so that it is safe
710 * to call create_mapping_noalloc() this early.
712 * On 64k pages, the FDT will be mapped using PTEs, so we need to
713 * be in the same PMD as the rest of the fixmap.
714 * On 4k pages, we'll use section mappings for the FDT so we only
715 * have to be in the same PUD.
717 BUILD_BUG_ON(dt_virt_base
% SZ_2M
);
719 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END
) >> SWAPPER_TABLE_SHIFT
!=
720 __fix_to_virt(FIX_BTMAP_BEGIN
) >> SWAPPER_TABLE_SHIFT
);
722 offset
= dt_phys
% SWAPPER_BLOCK_SIZE
;
723 dt_virt
= (void *)dt_virt_base
+ offset
;
725 /* map the first chunk so we can read the size from the header */
726 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
),
727 dt_virt_base
, SWAPPER_BLOCK_SIZE
, prot
);
729 if (fdt_magic(dt_virt
) != FDT_MAGIC
)
732 *size
= fdt_totalsize(dt_virt
);
733 if (*size
> MAX_FDT_SIZE
)
736 if (offset
+ *size
> SWAPPER_BLOCK_SIZE
)
737 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
), dt_virt_base
,
738 round_up(offset
+ *size
, SWAPPER_BLOCK_SIZE
), prot
);
743 void *__init
fixmap_remap_fdt(phys_addr_t dt_phys
)
748 dt_virt
= __fixmap_remap_fdt(dt_phys
, &size
, PAGE_KERNEL_RO
);
752 memblock_reserve(dt_phys
, size
);
756 int __init
arch_ioremap_pud_supported(void)
758 /* only 4k granule supports level 1 block mappings */
759 return IS_ENABLED(CONFIG_ARM64_4K_PAGES
);
762 int __init
arch_ioremap_pmd_supported(void)
767 int pud_set_huge(pud_t
*pud
, phys_addr_t phys
, pgprot_t prot
)
769 BUG_ON(phys
& ~PUD_MASK
);
770 set_pud(pud
, __pud(phys
| PUD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
774 int pmd_set_huge(pmd_t
*pmd
, phys_addr_t phys
, pgprot_t prot
)
776 BUG_ON(phys
& ~PMD_MASK
);
777 set_pmd(pmd
, __pmd(phys
| PMD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
781 int pud_clear_huge(pud_t
*pud
)
789 int pmd_clear_huge(pmd_t
*pmd
)