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 <linux/vmalloc.h>
36 #include <asm/barrier.h>
37 #include <asm/cputype.h>
38 #include <asm/fixmap.h>
39 #include <asm/kasan.h>
40 #include <asm/kernel-pgtable.h>
41 #include <asm/sections.h>
42 #include <asm/setup.h>
43 #include <asm/sizes.h>
45 #include <asm/memblock.h>
46 #include <asm/mmu_context.h>
47 #include <asm/ptdump.h>
49 #define NO_BLOCK_MAPPINGS BIT(0)
50 #define NO_CONT_MAPPINGS BIT(1)
52 u64 idmap_t0sz
= TCR_T0SZ(VA_BITS
);
54 u64 kimage_voffset __ro_after_init
;
55 EXPORT_SYMBOL(kimage_voffset
);
58 * Empty_zero_page is a special page that is used for zero-initialized data
61 unsigned long empty_zero_page
[PAGE_SIZE
/ sizeof(unsigned long)] __page_aligned_bss
;
62 EXPORT_SYMBOL(empty_zero_page
);
64 static pte_t bm_pte
[PTRS_PER_PTE
] __page_aligned_bss
;
65 static pmd_t bm_pmd
[PTRS_PER_PMD
] __page_aligned_bss __maybe_unused
;
66 static pud_t bm_pud
[PTRS_PER_PUD
] __page_aligned_bss __maybe_unused
;
68 pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long pfn
,
69 unsigned long size
, pgprot_t vma_prot
)
72 return pgprot_noncached(vma_prot
);
73 else if (file
->f_flags
& O_SYNC
)
74 return pgprot_writecombine(vma_prot
);
77 EXPORT_SYMBOL(phys_mem_access_prot
);
79 static phys_addr_t __init
early_pgtable_alloc(void)
84 phys
= memblock_alloc(PAGE_SIZE
, PAGE_SIZE
);
87 * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE
88 * slot will be free, so we can (ab)use the FIX_PTE slot to initialise
91 ptr
= pte_set_fixmap(phys
);
93 memset(ptr
, 0, PAGE_SIZE
);
96 * Implicit barriers also ensure the zeroed page is visible to the page
104 static bool pgattr_change_is_safe(u64 old
, u64
new)
107 * The following mapping attributes may be updated in live
108 * kernel mappings without the need for break-before-make.
110 static const pteval_t mask
= PTE_PXN
| PTE_RDONLY
| PTE_WRITE
;
112 /* creating or taking down mappings is always safe */
113 if (old
== 0 || new == 0)
116 /* live contiguous mappings may not be manipulated at all */
117 if ((old
| new) & PTE_CONT
)
120 return ((old
^ new) & ~mask
) == 0;
123 static void init_pte(pmd_t
*pmd
, unsigned long addr
, unsigned long end
,
124 phys_addr_t phys
, pgprot_t prot
)
128 pte
= pte_set_fixmap_offset(pmd
, addr
);
130 pte_t old_pte
= *pte
;
132 set_pte(pte
, pfn_pte(__phys_to_pfn(phys
), 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
)));
141 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
146 static void alloc_init_cont_pte(pmd_t
*pmd
, unsigned long addr
,
147 unsigned long end
, phys_addr_t phys
,
149 phys_addr_t (*pgtable_alloc
)(void),
154 BUG_ON(pmd_sect(*pmd
));
155 if (pmd_none(*pmd
)) {
156 phys_addr_t pte_phys
;
157 BUG_ON(!pgtable_alloc
);
158 pte_phys
= pgtable_alloc();
159 __pmd_populate(pmd
, pte_phys
, PMD_TYPE_TABLE
);
161 BUG_ON(pmd_bad(*pmd
));
164 pgprot_t __prot
= prot
;
166 next
= pte_cont_addr_end(addr
, end
);
168 /* use a contiguous mapping if the range is suitably aligned */
169 if ((((addr
| next
| phys
) & ~CONT_PTE_MASK
) == 0) &&
170 (flags
& NO_CONT_MAPPINGS
) == 0)
171 __prot
= __pgprot(pgprot_val(prot
) | PTE_CONT
);
173 init_pte(pmd
, addr
, next
, phys
, __prot
);
176 } while (addr
= next
, addr
!= end
);
179 static void 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), int flags
)
186 pmd
= pmd_set_fixmap_offset(pud
, addr
);
188 pmd_t old_pmd
= *pmd
;
190 next
= pmd_addr_end(addr
, end
);
192 /* try section mapping first */
193 if (((addr
| next
| phys
) & ~SECTION_MASK
) == 0 &&
194 (flags
& NO_BLOCK_MAPPINGS
) == 0) {
195 pmd_set_huge(pmd
, phys
, prot
);
198 * After the PMD entry has been populated once, we
199 * only allow updates to the permission attributes.
201 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd
),
204 alloc_init_cont_pte(pmd
, addr
, next
, phys
, prot
,
205 pgtable_alloc
, flags
);
207 BUG_ON(pmd_val(old_pmd
) != 0 &&
208 pmd_val(old_pmd
) != pmd_val(*pmd
));
211 } while (pmd
++, addr
= next
, addr
!= end
);
216 static void alloc_init_cont_pmd(pud_t
*pud
, unsigned long addr
,
217 unsigned long end
, phys_addr_t phys
,
219 phys_addr_t (*pgtable_alloc
)(void), int flags
)
224 * Check for initial section mappings in the pgd/pud.
226 BUG_ON(pud_sect(*pud
));
227 if (pud_none(*pud
)) {
228 phys_addr_t pmd_phys
;
229 BUG_ON(!pgtable_alloc
);
230 pmd_phys
= pgtable_alloc();
231 __pud_populate(pud
, pmd_phys
, PUD_TYPE_TABLE
);
233 BUG_ON(pud_bad(*pud
));
236 pgprot_t __prot
= prot
;
238 next
= pmd_cont_addr_end(addr
, end
);
240 /* use a contiguous mapping if the range is suitably aligned */
241 if ((((addr
| next
| phys
) & ~CONT_PMD_MASK
) == 0) &&
242 (flags
& NO_CONT_MAPPINGS
) == 0)
243 __prot
= __pgprot(pgprot_val(prot
) | PTE_CONT
);
245 init_pmd(pud
, addr
, next
, phys
, __prot
, pgtable_alloc
, flags
);
248 } while (addr
= next
, addr
!= end
);
251 static inline bool use_1G_block(unsigned long addr
, unsigned long next
,
254 if (PAGE_SHIFT
!= 12)
257 if (((addr
| next
| phys
) & ~PUD_MASK
) != 0)
263 static void alloc_init_pud(pgd_t
*pgd
, unsigned long addr
, unsigned long end
,
264 phys_addr_t phys
, pgprot_t prot
,
265 phys_addr_t (*pgtable_alloc
)(void),
271 if (pgd_none(*pgd
)) {
272 phys_addr_t pud_phys
;
273 BUG_ON(!pgtable_alloc
);
274 pud_phys
= pgtable_alloc();
275 __pgd_populate(pgd
, pud_phys
, PUD_TYPE_TABLE
);
277 BUG_ON(pgd_bad(*pgd
));
279 pud
= pud_set_fixmap_offset(pgd
, addr
);
281 pud_t old_pud
= *pud
;
283 next
= pud_addr_end(addr
, end
);
286 * For 4K granule only, attempt to put down a 1GB block
288 if (use_1G_block(addr
, next
, phys
) &&
289 (flags
& NO_BLOCK_MAPPINGS
) == 0) {
290 pud_set_huge(pud
, phys
, prot
);
293 * After the PUD entry has been populated once, we
294 * only allow updates to the permission attributes.
296 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud
),
299 alloc_init_cont_pmd(pud
, addr
, next
, phys
, prot
,
300 pgtable_alloc
, flags
);
302 BUG_ON(pud_val(old_pud
) != 0 &&
303 pud_val(old_pud
) != pud_val(*pud
));
306 } while (pud
++, addr
= next
, addr
!= end
);
311 static void __create_pgd_mapping(pgd_t
*pgdir
, phys_addr_t phys
,
312 unsigned long virt
, phys_addr_t size
,
314 phys_addr_t (*pgtable_alloc
)(void),
317 unsigned long addr
, length
, end
, next
;
318 pgd_t
*pgd
= pgd_offset_raw(pgdir
, virt
);
321 * If the virtual and physical address don't have the same offset
322 * within a page, we cannot map the region as the caller expects.
324 if (WARN_ON((phys
^ virt
) & ~PAGE_MASK
))
328 addr
= virt
& PAGE_MASK
;
329 length
= PAGE_ALIGN(size
+ (virt
& ~PAGE_MASK
));
333 next
= pgd_addr_end(addr
, end
);
334 alloc_init_pud(pgd
, addr
, next
, phys
, prot
, pgtable_alloc
,
337 } while (pgd
++, addr
= next
, addr
!= end
);
340 static phys_addr_t
pgd_pgtable_alloc(void)
342 void *ptr
= (void *)__get_free_page(PGALLOC_GFP
);
343 if (!ptr
|| !pgtable_page_ctor(virt_to_page(ptr
)))
346 /* Ensure the zeroed page is visible to the page table walker */
352 * This function can only be used to modify existing table entries,
353 * without allocating new levels of table. Note that this permits the
354 * creation of new section or page entries.
356 static void __init
create_mapping_noalloc(phys_addr_t phys
, unsigned long virt
,
357 phys_addr_t size
, pgprot_t prot
)
359 if (virt
< VMALLOC_START
) {
360 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
364 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
, NULL
,
368 void __init
create_pgd_mapping(struct mm_struct
*mm
, phys_addr_t phys
,
369 unsigned long virt
, phys_addr_t size
,
370 pgprot_t prot
, bool page_mappings_only
)
374 BUG_ON(mm
== &init_mm
);
376 if (page_mappings_only
)
377 flags
= NO_BLOCK_MAPPINGS
| NO_CONT_MAPPINGS
;
379 __create_pgd_mapping(mm
->pgd
, phys
, virt
, size
, prot
,
380 pgd_pgtable_alloc
, flags
);
383 static void update_mapping_prot(phys_addr_t phys
, unsigned long virt
,
384 phys_addr_t size
, pgprot_t prot
)
386 if (virt
< VMALLOC_START
) {
387 pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
392 __create_pgd_mapping(init_mm
.pgd
, phys
, virt
, size
, prot
, NULL
,
395 /* flush the TLBs after updating live kernel mappings */
396 flush_tlb_kernel_range(virt
, virt
+ size
);
399 static void __init
__map_memblock(pgd_t
*pgd
, phys_addr_t start
,
400 phys_addr_t end
, pgprot_t prot
, int flags
)
402 __create_pgd_mapping(pgd
, start
, __phys_to_virt(start
), end
- start
,
403 prot
, early_pgtable_alloc
, flags
);
406 void __init
mark_linear_text_alias_ro(void)
409 * Remove the write permissions from the linear alias of .text/.rodata
411 update_mapping_prot(__pa_symbol(_text
), (unsigned long)lm_alias(_text
),
412 (unsigned long)__init_begin
- (unsigned long)_text
,
416 static void __init
map_mem(pgd_t
*pgd
)
418 phys_addr_t kernel_start
= __pa_symbol(_text
);
419 phys_addr_t kernel_end
= __pa_symbol(__init_begin
);
420 struct memblock_region
*reg
;
423 if (debug_pagealloc_enabled())
424 flags
= NO_BLOCK_MAPPINGS
| NO_CONT_MAPPINGS
;
427 * Take care not to create a writable alias for the
428 * read-only text and rodata sections of the kernel image.
429 * So temporarily mark them as NOMAP to skip mappings in
430 * the following for-loop
432 memblock_mark_nomap(kernel_start
, kernel_end
- kernel_start
);
433 #ifdef CONFIG_KEXEC_CORE
435 memblock_mark_nomap(crashk_res
.start
,
436 resource_size(&crashk_res
));
439 /* map all the memory banks */
440 for_each_memblock(memory
, reg
) {
441 phys_addr_t start
= reg
->base
;
442 phys_addr_t end
= start
+ reg
->size
;
446 if (memblock_is_nomap(reg
))
449 __map_memblock(pgd
, start
, end
, PAGE_KERNEL
, flags
);
453 * Map the linear alias of the [_text, __init_begin) interval
454 * as non-executable now, and remove the write permission in
455 * mark_linear_text_alias_ro() below (which will be called after
456 * alternative patching has completed). This makes the contents
457 * of the region accessible to subsystems such as hibernate,
458 * but protects it from inadvertent modification or execution.
459 * Note that contiguous mappings cannot be remapped in this way,
460 * so we should avoid them here.
462 __map_memblock(pgd
, kernel_start
, kernel_end
,
463 PAGE_KERNEL
, NO_CONT_MAPPINGS
);
464 memblock_clear_nomap(kernel_start
, kernel_end
- kernel_start
);
466 #ifdef CONFIG_KEXEC_CORE
468 * Use page-level mappings here so that we can shrink the region
469 * in page granularity and put back unused memory to buddy system
470 * through /sys/kernel/kexec_crash_size interface.
472 if (crashk_res
.end
) {
473 __map_memblock(pgd
, crashk_res
.start
, crashk_res
.end
+ 1,
475 NO_BLOCK_MAPPINGS
| NO_CONT_MAPPINGS
);
476 memblock_clear_nomap(crashk_res
.start
,
477 resource_size(&crashk_res
));
482 void mark_rodata_ro(void)
484 unsigned long section_size
;
487 * mark .rodata as read only. Use __init_begin rather than __end_rodata
488 * to cover NOTES and EXCEPTION_TABLE.
490 section_size
= (unsigned long)__init_begin
- (unsigned long)__start_rodata
;
491 update_mapping_prot(__pa_symbol(__start_rodata
), (unsigned long)__start_rodata
,
492 section_size
, PAGE_KERNEL_RO
);
497 static void __init
map_kernel_segment(pgd_t
*pgd
, void *va_start
, void *va_end
,
498 pgprot_t prot
, struct vm_struct
*vma
,
501 phys_addr_t pa_start
= __pa_symbol(va_start
);
502 unsigned long size
= va_end
- va_start
;
504 BUG_ON(!PAGE_ALIGNED(pa_start
));
505 BUG_ON(!PAGE_ALIGNED(size
));
507 __create_pgd_mapping(pgd
, pa_start
, (unsigned long)va_start
, size
, prot
,
508 early_pgtable_alloc
, flags
);
510 vma
->addr
= va_start
;
511 vma
->phys_addr
= pa_start
;
514 vma
->caller
= __builtin_return_address(0);
516 vm_area_add_early(vma
);
519 static int __init
parse_rodata(char *arg
)
521 return strtobool(arg
, &rodata_enabled
);
523 early_param("rodata", parse_rodata
);
526 * Create fine-grained mappings for the kernel.
528 static void __init
map_kernel(pgd_t
*pgd
)
530 static struct vm_struct vmlinux_text
, vmlinux_rodata
, vmlinux_inittext
,
531 vmlinux_initdata
, vmlinux_data
;
534 * External debuggers may need to write directly to the text
535 * mapping to install SW breakpoints. Allow this (only) when
536 * explicitly requested with rodata=off.
538 pgprot_t text_prot
= rodata_enabled
? PAGE_KERNEL_ROX
: PAGE_KERNEL_EXEC
;
541 * Only rodata will be remapped with different permissions later on,
542 * all other segments are allowed to use contiguous mappings.
544 map_kernel_segment(pgd
, _text
, _etext
, text_prot
, &vmlinux_text
, 0);
545 map_kernel_segment(pgd
, __start_rodata
, __inittext_begin
, PAGE_KERNEL
,
546 &vmlinux_rodata
, NO_CONT_MAPPINGS
);
547 map_kernel_segment(pgd
, __inittext_begin
, __inittext_end
, text_prot
,
548 &vmlinux_inittext
, 0);
549 map_kernel_segment(pgd
, __initdata_begin
, __initdata_end
, PAGE_KERNEL
,
550 &vmlinux_initdata
, 0);
551 map_kernel_segment(pgd
, _data
, _end
, PAGE_KERNEL
, &vmlinux_data
, 0);
553 if (!pgd_val(*pgd_offset_raw(pgd
, FIXADDR_START
))) {
555 * The fixmap falls in a separate pgd to the kernel, and doesn't
556 * live in the carveout for the swapper_pg_dir. We can simply
557 * re-use the existing dir for the fixmap.
559 set_pgd(pgd_offset_raw(pgd
, FIXADDR_START
),
560 *pgd_offset_k(FIXADDR_START
));
561 } else if (CONFIG_PGTABLE_LEVELS
> 3) {
563 * The fixmap shares its top level pgd entry with the kernel
564 * mapping. This can really only occur when we are running
565 * with 16k/4 levels, so we can simply reuse the pud level
568 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
569 set_pud(pud_set_fixmap_offset(pgd
, FIXADDR_START
),
570 __pud(__pa_symbol(bm_pmd
) | PUD_TYPE_TABLE
));
576 kasan_copy_shadow(pgd
);
580 * paging_init() sets up the page tables, initialises the zone memory
581 * maps and sets up the zero page.
583 void __init
paging_init(void)
585 phys_addr_t pgd_phys
= early_pgtable_alloc();
586 pgd_t
*pgd
= pgd_set_fixmap(pgd_phys
);
592 * We want to reuse the original swapper_pg_dir so we don't have to
593 * communicate the new address to non-coherent secondaries in
594 * secondary_entry, and so cpu_switch_mm can generate the address with
595 * adrp+add rather than a load from some global variable.
597 * To do this we need to go via a temporary pgd.
599 cpu_replace_ttbr1(__va(pgd_phys
));
600 memcpy(swapper_pg_dir
, pgd
, PGD_SIZE
);
601 cpu_replace_ttbr1(lm_alias(swapper_pg_dir
));
604 memblock_free(pgd_phys
, PAGE_SIZE
);
607 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
610 memblock_free(__pa_symbol(swapper_pg_dir
) + PAGE_SIZE
,
611 SWAPPER_DIR_SIZE
- PAGE_SIZE
);
615 * Check whether a kernel address is valid (derived from arch/x86/).
617 int kern_addr_valid(unsigned long addr
)
624 if ((((long)addr
) >> VA_BITS
) != -1UL)
627 pgd
= pgd_offset_k(addr
);
631 pud
= pud_offset(pgd
, addr
);
636 return pfn_valid(pud_pfn(*pud
));
638 pmd
= pmd_offset(pud
, addr
);
643 return pfn_valid(pmd_pfn(*pmd
));
645 pte
= pte_offset_kernel(pmd
, addr
);
649 return pfn_valid(pte_pfn(*pte
));
651 #ifdef CONFIG_SPARSEMEM_VMEMMAP
652 #if !ARM64_SWAPPER_USES_SECTION_MAPS
653 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
655 return vmemmap_populate_basepages(start
, end
, node
);
657 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
658 int __meminit
vmemmap_populate(unsigned long start
, unsigned long end
, int node
)
660 unsigned long addr
= start
;
667 next
= pmd_addr_end(addr
, end
);
669 pgd
= vmemmap_pgd_populate(addr
, node
);
673 pud
= vmemmap_pud_populate(pgd
, addr
, node
);
677 pmd
= pmd_offset(pud
, addr
);
678 if (pmd_none(*pmd
)) {
681 p
= vmemmap_alloc_block_buf(PMD_SIZE
, node
);
685 set_pmd(pmd
, __pmd(__pa(p
) | PROT_SECT_NORMAL
));
687 vmemmap_verify((pte_t
*)pmd
, node
, addr
, next
);
688 } while (addr
= next
, addr
!= end
);
692 #endif /* CONFIG_ARM64_64K_PAGES */
693 void vmemmap_free(unsigned long start
, unsigned long end
)
696 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
698 static inline pud_t
* fixmap_pud(unsigned long addr
)
700 pgd_t
*pgd
= pgd_offset_k(addr
);
702 BUG_ON(pgd_none(*pgd
) || pgd_bad(*pgd
));
704 return pud_offset_kimg(pgd
, addr
);
707 static inline pmd_t
* fixmap_pmd(unsigned long addr
)
709 pud_t
*pud
= fixmap_pud(addr
);
711 BUG_ON(pud_none(*pud
) || pud_bad(*pud
));
713 return pmd_offset_kimg(pud
, addr
);
716 static inline pte_t
* fixmap_pte(unsigned long addr
)
718 return &bm_pte
[pte_index(addr
)];
722 * The p*d_populate functions call virt_to_phys implicitly so they can't be used
723 * directly on kernel symbols (bm_p*d). This function is called too early to use
724 * lm_alias so __p*d_populate functions must be used to populate with the
725 * physical address from __pa_symbol.
727 void __init
early_fixmap_init(void)
732 unsigned long addr
= FIXADDR_START
;
734 pgd
= pgd_offset_k(addr
);
735 if (CONFIG_PGTABLE_LEVELS
> 3 &&
736 !(pgd_none(*pgd
) || pgd_page_paddr(*pgd
) == __pa_symbol(bm_pud
))) {
738 * We only end up here if the kernel mapping and the fixmap
739 * share the top level pgd entry, which should only happen on
740 * 16k/4 levels configurations.
742 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES
));
743 pud
= pud_offset_kimg(pgd
, addr
);
746 __pgd_populate(pgd
, __pa_symbol(bm_pud
), PUD_TYPE_TABLE
);
747 pud
= fixmap_pud(addr
);
750 __pud_populate(pud
, __pa_symbol(bm_pmd
), PMD_TYPE_TABLE
);
751 pmd
= fixmap_pmd(addr
);
752 __pmd_populate(pmd
, __pa_symbol(bm_pte
), PMD_TYPE_TABLE
);
755 * The boot-ioremap range spans multiple pmds, for which
756 * we are not prepared:
758 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN
) >> PMD_SHIFT
)
759 != (__fix_to_virt(FIX_BTMAP_END
) >> PMD_SHIFT
));
761 if ((pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)))
762 || pmd
!= fixmap_pmd(fix_to_virt(FIX_BTMAP_END
))) {
764 pr_warn("pmd %p != %p, %p\n",
765 pmd
, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN
)),
766 fixmap_pmd(fix_to_virt(FIX_BTMAP_END
)));
767 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
768 fix_to_virt(FIX_BTMAP_BEGIN
));
769 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
770 fix_to_virt(FIX_BTMAP_END
));
772 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END
);
773 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN
);
777 void __set_fixmap(enum fixed_addresses idx
,
778 phys_addr_t phys
, pgprot_t flags
)
780 unsigned long addr
= __fix_to_virt(idx
);
783 BUG_ON(idx
<= FIX_HOLE
|| idx
>= __end_of_fixed_addresses
);
785 pte
= fixmap_pte(addr
);
787 if (pgprot_val(flags
)) {
788 set_pte(pte
, pfn_pte(phys
>> PAGE_SHIFT
, flags
));
790 pte_clear(&init_mm
, addr
, pte
);
791 flush_tlb_kernel_range(addr
, addr
+PAGE_SIZE
);
795 void *__init
__fixmap_remap_fdt(phys_addr_t dt_phys
, int *size
, pgprot_t prot
)
797 const u64 dt_virt_base
= __fix_to_virt(FIX_FDT
);
802 * Check whether the physical FDT address is set and meets the minimum
803 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
804 * at least 8 bytes so that we can always access the magic and size
805 * fields of the FDT header after mapping the first chunk, double check
806 * here if that is indeed the case.
808 BUILD_BUG_ON(MIN_FDT_ALIGN
< 8);
809 if (!dt_phys
|| dt_phys
% MIN_FDT_ALIGN
)
813 * Make sure that the FDT region can be mapped without the need to
814 * allocate additional translation table pages, so that it is safe
815 * to call create_mapping_noalloc() this early.
817 * On 64k pages, the FDT will be mapped using PTEs, so we need to
818 * be in the same PMD as the rest of the fixmap.
819 * On 4k pages, we'll use section mappings for the FDT so we only
820 * have to be in the same PUD.
822 BUILD_BUG_ON(dt_virt_base
% SZ_2M
);
824 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END
) >> SWAPPER_TABLE_SHIFT
!=
825 __fix_to_virt(FIX_BTMAP_BEGIN
) >> SWAPPER_TABLE_SHIFT
);
827 offset
= dt_phys
% SWAPPER_BLOCK_SIZE
;
828 dt_virt
= (void *)dt_virt_base
+ offset
;
830 /* map the first chunk so we can read the size from the header */
831 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
),
832 dt_virt_base
, SWAPPER_BLOCK_SIZE
, prot
);
834 if (fdt_magic(dt_virt
) != FDT_MAGIC
)
837 *size
= fdt_totalsize(dt_virt
);
838 if (*size
> MAX_FDT_SIZE
)
841 if (offset
+ *size
> SWAPPER_BLOCK_SIZE
)
842 create_mapping_noalloc(round_down(dt_phys
, SWAPPER_BLOCK_SIZE
), dt_virt_base
,
843 round_up(offset
+ *size
, SWAPPER_BLOCK_SIZE
), prot
);
848 void *__init
fixmap_remap_fdt(phys_addr_t dt_phys
)
853 dt_virt
= __fixmap_remap_fdt(dt_phys
, &size
, PAGE_KERNEL_RO
);
857 memblock_reserve(dt_phys
, size
);
861 int __init
arch_ioremap_pud_supported(void)
863 /* only 4k granule supports level 1 block mappings */
864 return IS_ENABLED(CONFIG_ARM64_4K_PAGES
);
867 int __init
arch_ioremap_pmd_supported(void)
872 int pud_set_huge(pud_t
*pud
, phys_addr_t phys
, pgprot_t prot
)
874 BUG_ON(phys
& ~PUD_MASK
);
875 set_pud(pud
, __pud(phys
| PUD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
879 int pmd_set_huge(pmd_t
*pmd
, phys_addr_t phys
, pgprot_t prot
)
881 BUG_ON(phys
& ~PMD_MASK
);
882 set_pmd(pmd
, __pmd(phys
| PMD_TYPE_SECT
| pgprot_val(mk_sect_prot(prot
))));
886 int pud_clear_huge(pud_t
*pud
)
894 int pmd_clear_huge(pmd_t
*pmd
)