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);
53 u64 idmap_ptrs_per_pgd = PTRS_PER_PGD;
55 u64 kimage_voffset __ro_after_init;
56 EXPORT_SYMBOL(kimage_voffset);
59 * Empty_zero_page is a special page that is used for zero-initialized data
62 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
63 EXPORT_SYMBOL(empty_zero_page);
65 static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
66 static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused;
67 static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused;
69 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
70 unsigned long size, pgprot_t vma_prot)
73 return pgprot_noncached(vma_prot);
74 else if (file->f_flags & O_SYNC)
75 return pgprot_writecombine(vma_prot);
78 EXPORT_SYMBOL(phys_mem_access_prot);
80 static phys_addr_t __init early_pgtable_alloc(void)
85 phys = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
88 * The FIX_{PGD,PUD,PMD} slots may be in active use, but the FIX_PTE
89 * slot will be free, so we can (ab)use the FIX_PTE slot to initialise
92 ptr = pte_set_fixmap(phys);
94 memset(ptr, 0, PAGE_SIZE);
97 * Implicit barriers also ensure the zeroed page is visible to the page
105 static bool pgattr_change_is_safe(u64 old, u64 new)
108 * The following mapping attributes may be updated in live
109 * kernel mappings without the need for break-before-make.
111 static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE;
113 /* creating or taking down mappings is always safe */
114 if (old == 0 || new == 0)
117 /* live contiguous mappings may not be manipulated at all */
118 if ((old | new) & PTE_CONT)
121 return ((old ^ new) & ~mask) == 0;
124 static void init_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
125 phys_addr_t phys, pgprot_t prot)
129 pte = pte_set_fixmap_offset(pmd, addr);
131 pte_t old_pte = *pte;
133 set_pte(pte, pfn_pte(__phys_to_pfn(phys), 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)));
142 } while (pte++, addr += PAGE_SIZE, addr != end);
147 static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr,
148 unsigned long end, phys_addr_t phys,
150 phys_addr_t (*pgtable_alloc)(void),
155 BUG_ON(pmd_sect(*pmd));
156 if (pmd_none(*pmd)) {
157 phys_addr_t pte_phys;
158 BUG_ON(!pgtable_alloc);
159 pte_phys = pgtable_alloc();
160 __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
162 BUG_ON(pmd_bad(*pmd));
165 pgprot_t __prot = prot;
167 next = pte_cont_addr_end(addr, end);
169 /* use a contiguous mapping if the range is suitably aligned */
170 if ((((addr | next | phys) & ~CONT_PTE_MASK) == 0) &&
171 (flags & NO_CONT_MAPPINGS) == 0)
172 __prot = __pgprot(pgprot_val(prot) | PTE_CONT);
174 init_pte(pmd, addr, next, phys, __prot);
177 } while (addr = next, addr != end);
180 static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
181 phys_addr_t phys, pgprot_t prot,
182 phys_addr_t (*pgtable_alloc)(void), int flags)
187 pmd = pmd_set_fixmap_offset(pud, addr);
189 pmd_t old_pmd = *pmd;
191 next = pmd_addr_end(addr, end);
193 /* try section mapping first */
194 if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
195 (flags & NO_BLOCK_MAPPINGS) == 0) {
196 pmd_set_huge(pmd, phys, prot);
199 * After the PMD entry has been populated once, we
200 * only allow updates to the permission attributes.
202 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
205 alloc_init_cont_pte(pmd, addr, next, phys, prot,
206 pgtable_alloc, flags);
208 BUG_ON(pmd_val(old_pmd) != 0 &&
209 pmd_val(old_pmd) != pmd_val(*pmd));
212 } while (pmd++, addr = next, addr != end);
217 static void alloc_init_cont_pmd(pud_t *pud, unsigned long addr,
218 unsigned long end, phys_addr_t phys,
220 phys_addr_t (*pgtable_alloc)(void), int flags)
225 * Check for initial section mappings in the pgd/pud.
227 BUG_ON(pud_sect(*pud));
228 if (pud_none(*pud)) {
229 phys_addr_t pmd_phys;
230 BUG_ON(!pgtable_alloc);
231 pmd_phys = pgtable_alloc();
232 __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE);
234 BUG_ON(pud_bad(*pud));
237 pgprot_t __prot = prot;
239 next = pmd_cont_addr_end(addr, end);
241 /* use a contiguous mapping if the range is suitably aligned */
242 if ((((addr | next | phys) & ~CONT_PMD_MASK) == 0) &&
243 (flags & NO_CONT_MAPPINGS) == 0)
244 __prot = __pgprot(pgprot_val(prot) | PTE_CONT);
246 init_pmd(pud, addr, next, phys, __prot, pgtable_alloc, flags);
249 } while (addr = next, addr != end);
252 static inline bool use_1G_block(unsigned long addr, unsigned long next,
255 if (PAGE_SHIFT != 12)
258 if (((addr | next | phys) & ~PUD_MASK) != 0)
264 static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
265 phys_addr_t phys, pgprot_t prot,
266 phys_addr_t (*pgtable_alloc)(void),
272 if (pgd_none(*pgd)) {
273 phys_addr_t pud_phys;
274 BUG_ON(!pgtable_alloc);
275 pud_phys = pgtable_alloc();
276 __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE);
278 BUG_ON(pgd_bad(*pgd));
280 pud = pud_set_fixmap_offset(pgd, addr);
282 pud_t old_pud = *pud;
284 next = pud_addr_end(addr, end);
287 * For 4K granule only, attempt to put down a 1GB block
289 if (use_1G_block(addr, next, phys) &&
290 (flags & NO_BLOCK_MAPPINGS) == 0) {
291 pud_set_huge(pud, phys, prot);
294 * After the PUD entry has been populated once, we
295 * only allow updates to the permission attributes.
297 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud),
300 alloc_init_cont_pmd(pud, addr, next, phys, prot,
301 pgtable_alloc, flags);
303 BUG_ON(pud_val(old_pud) != 0 &&
304 pud_val(old_pud) != pud_val(*pud));
307 } while (pud++, addr = next, addr != end);
312 static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
313 unsigned long virt, phys_addr_t size,
315 phys_addr_t (*pgtable_alloc)(void),
318 unsigned long addr, length, end, next;
319 pgd_t *pgd = pgd_offset_raw(pgdir, virt);
322 * If the virtual and physical address don't have the same offset
323 * within a page, we cannot map the region as the caller expects.
325 if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
329 addr = virt & PAGE_MASK;
330 length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
334 next = pgd_addr_end(addr, end);
335 alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc,
338 } while (pgd++, addr = next, addr != end);
341 static phys_addr_t pgd_pgtable_alloc(void)
343 void *ptr = (void *)__get_free_page(PGALLOC_GFP);
344 if (!ptr || !pgtable_page_ctor(virt_to_page(ptr)))
347 /* Ensure the zeroed page is visible to the page table walker */
353 * This function can only be used to modify existing table entries,
354 * without allocating new levels of table. Note that this permits the
355 * creation of new section or page entries.
357 static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
358 phys_addr_t size, pgprot_t prot)
360 if (virt < VMALLOC_START) {
361 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
365 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
369 void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
370 unsigned long virt, phys_addr_t size,
371 pgprot_t prot, bool page_mappings_only)
375 BUG_ON(mm == &init_mm);
377 if (page_mappings_only)
378 flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
380 __create_pgd_mapping(mm->pgd, phys, virt, size, prot,
381 pgd_pgtable_alloc, flags);
384 static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
385 phys_addr_t size, pgprot_t prot)
387 if (virt < VMALLOC_START) {
388 pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
393 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
396 /* flush the TLBs after updating live kernel mappings */
397 flush_tlb_kernel_range(virt, virt + size);
400 static void __init __map_memblock(pgd_t *pgd, phys_addr_t start,
401 phys_addr_t end, pgprot_t prot, int flags)
403 __create_pgd_mapping(pgd, start, __phys_to_virt(start), end - start,
404 prot, early_pgtable_alloc, flags);
407 void __init mark_linear_text_alias_ro(void)
410 * Remove the write permissions from the linear alias of .text/.rodata
412 update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text),
413 (unsigned long)__init_begin - (unsigned long)_text,
417 static void __init map_mem(pgd_t *pgd)
419 phys_addr_t kernel_start = __pa_symbol(_text);
420 phys_addr_t kernel_end = __pa_symbol(__init_begin);
421 struct memblock_region *reg;
424 if (debug_pagealloc_enabled())
425 flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
428 * Take care not to create a writable alias for the
429 * read-only text and rodata sections of the kernel image.
430 * So temporarily mark them as NOMAP to skip mappings in
431 * the following for-loop
433 memblock_mark_nomap(kernel_start, kernel_end - kernel_start);
434 #ifdef CONFIG_KEXEC_CORE
436 memblock_mark_nomap(crashk_res.start,
437 resource_size(&crashk_res));
440 /* map all the memory banks */
441 for_each_memblock(memory, reg) {
442 phys_addr_t start = reg->base;
443 phys_addr_t end = start + reg->size;
447 if (memblock_is_nomap(reg))
450 __map_memblock(pgd, start, end, PAGE_KERNEL, flags);
454 * Map the linear alias of the [_text, __init_begin) interval
455 * as non-executable now, and remove the write permission in
456 * mark_linear_text_alias_ro() below (which will be called after
457 * alternative patching has completed). This makes the contents
458 * of the region accessible to subsystems such as hibernate,
459 * but protects it from inadvertent modification or execution.
460 * Note that contiguous mappings cannot be remapped in this way,
461 * so we should avoid them here.
463 __map_memblock(pgd, kernel_start, kernel_end,
464 PAGE_KERNEL, NO_CONT_MAPPINGS);
465 memblock_clear_nomap(kernel_start, kernel_end - kernel_start);
467 #ifdef CONFIG_KEXEC_CORE
469 * Use page-level mappings here so that we can shrink the region
470 * in page granularity and put back unused memory to buddy system
471 * through /sys/kernel/kexec_crash_size interface.
473 if (crashk_res.end) {
474 __map_memblock(pgd, crashk_res.start, crashk_res.end + 1,
476 NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS);
477 memblock_clear_nomap(crashk_res.start,
478 resource_size(&crashk_res));
483 void mark_rodata_ro(void)
485 unsigned long section_size;
488 * mark .rodata as read only. Use __init_begin rather than __end_rodata
489 * to cover NOTES and EXCEPTION_TABLE.
491 section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata;
492 update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata,
493 section_size, PAGE_KERNEL_RO);
498 static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
499 pgprot_t prot, struct vm_struct *vma,
500 int flags, unsigned long vm_flags)
502 phys_addr_t pa_start = __pa_symbol(va_start);
503 unsigned long size = va_end - va_start;
505 BUG_ON(!PAGE_ALIGNED(pa_start));
506 BUG_ON(!PAGE_ALIGNED(size));
508 __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
509 early_pgtable_alloc, flags);
511 if (!(vm_flags & VM_NO_GUARD))
514 vma->addr = va_start;
515 vma->phys_addr = pa_start;
517 vma->flags = VM_MAP | vm_flags;
518 vma->caller = __builtin_return_address(0);
520 vm_area_add_early(vma);
523 static int __init parse_rodata(char *arg)
525 return strtobool(arg, &rodata_enabled);
527 early_param("rodata", parse_rodata);
529 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
530 static int __init map_entry_trampoline(void)
532 pgprot_t prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
533 phys_addr_t pa_start = __pa_symbol(__entry_tramp_text_start);
535 /* The trampoline is always mapped and can therefore be global */
536 pgprot_val(prot) &= ~PTE_NG;
538 /* Map only the text into the trampoline page table */
539 memset(tramp_pg_dir, 0, PGD_SIZE);
540 __create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS, PAGE_SIZE,
541 prot, pgd_pgtable_alloc, 0);
543 /* Map both the text and data into the kernel page table */
544 __set_fixmap(FIX_ENTRY_TRAMP_TEXT, pa_start, prot);
545 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
546 extern char __entry_tramp_data_start[];
548 __set_fixmap(FIX_ENTRY_TRAMP_DATA,
549 __pa_symbol(__entry_tramp_data_start),
555 core_initcall(map_entry_trampoline);
559 * Create fine-grained mappings for the kernel.
561 static void __init map_kernel(pgd_t *pgd)
563 static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext,
564 vmlinux_initdata, vmlinux_data;
567 * External debuggers may need to write directly to the text
568 * mapping to install SW breakpoints. Allow this (only) when
569 * explicitly requested with rodata=off.
571 pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
574 * Only rodata will be remapped with different permissions later on,
575 * all other segments are allowed to use contiguous mappings.
577 map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text, 0,
579 map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL,
580 &vmlinux_rodata, NO_CONT_MAPPINGS, VM_NO_GUARD);
581 map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot,
582 &vmlinux_inittext, 0, VM_NO_GUARD);
583 map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL,
584 &vmlinux_initdata, 0, VM_NO_GUARD);
585 map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0);
587 if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) {
589 * The fixmap falls in a separate pgd to the kernel, and doesn't
590 * live in the carveout for the swapper_pg_dir. We can simply
591 * re-use the existing dir for the fixmap.
593 set_pgd(pgd_offset_raw(pgd, FIXADDR_START),
594 *pgd_offset_k(FIXADDR_START));
595 } else if (CONFIG_PGTABLE_LEVELS > 3) {
597 * The fixmap shares its top level pgd entry with the kernel
598 * mapping. This can really only occur when we are running
599 * with 16k/4 levels, so we can simply reuse the pud level
602 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
603 pud_populate(&init_mm, pud_set_fixmap_offset(pgd, FIXADDR_START),
610 kasan_copy_shadow(pgd);
614 * paging_init() sets up the page tables, initialises the zone memory
615 * maps and sets up the zero page.
617 void __init paging_init(void)
619 phys_addr_t pgd_phys = early_pgtable_alloc();
620 pgd_t *pgd = pgd_set_fixmap(pgd_phys);
626 * We want to reuse the original swapper_pg_dir so we don't have to
627 * communicate the new address to non-coherent secondaries in
628 * secondary_entry, and so cpu_switch_mm can generate the address with
629 * adrp+add rather than a load from some global variable.
631 * To do this we need to go via a temporary pgd.
633 cpu_replace_ttbr1(__va(pgd_phys));
634 memcpy(swapper_pg_dir, pgd, PGD_SIZE);
635 cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
638 memblock_free(pgd_phys, PAGE_SIZE);
641 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
644 memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE,
645 __pa_symbol(swapper_pg_end) - __pa_symbol(swapper_pg_dir)
650 * Check whether a kernel address is valid (derived from arch/x86/).
652 int kern_addr_valid(unsigned long addr)
659 if ((((long)addr) >> VA_BITS) != -1UL)
662 pgd = pgd_offset_k(addr);
666 pud = pud_offset(pgd, addr);
671 return pfn_valid(pud_pfn(*pud));
673 pmd = pmd_offset(pud, addr);
678 return pfn_valid(pmd_pfn(*pmd));
680 pte = pte_offset_kernel(pmd, addr);
684 return pfn_valid(pte_pfn(*pte));
686 #ifdef CONFIG_SPARSEMEM_VMEMMAP
687 #if !ARM64_SWAPPER_USES_SECTION_MAPS
688 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
689 struct vmem_altmap *altmap)
691 return vmemmap_populate_basepages(start, end, node);
693 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
694 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
695 struct vmem_altmap *altmap)
697 unsigned long addr = start;
704 next = pmd_addr_end(addr, end);
706 pgd = vmemmap_pgd_populate(addr, node);
710 pud = vmemmap_pud_populate(pgd, addr, node);
714 pmd = pmd_offset(pud, addr);
715 if (pmd_none(*pmd)) {
718 p = vmemmap_alloc_block_buf(PMD_SIZE, node);
722 pmd_set_huge(pmd, __pa(p), __pgprot(PROT_SECT_NORMAL));
724 vmemmap_verify((pte_t *)pmd, node, addr, next);
725 } while (addr = next, addr != end);
729 #endif /* CONFIG_ARM64_64K_PAGES */
730 void vmemmap_free(unsigned long start, unsigned long end,
731 struct vmem_altmap *altmap)
734 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
736 static inline pud_t * fixmap_pud(unsigned long addr)
738 pgd_t *pgd = pgd_offset_k(addr);
740 BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd));
742 return pud_offset_kimg(pgd, addr);
745 static inline pmd_t * fixmap_pmd(unsigned long addr)
747 pud_t *pud = fixmap_pud(addr);
749 BUG_ON(pud_none(*pud) || pud_bad(*pud));
751 return pmd_offset_kimg(pud, addr);
754 static inline pte_t * fixmap_pte(unsigned long addr)
756 return &bm_pte[pte_index(addr)];
760 * The p*d_populate functions call virt_to_phys implicitly so they can't be used
761 * directly on kernel symbols (bm_p*d). This function is called too early to use
762 * lm_alias so __p*d_populate functions must be used to populate with the
763 * physical address from __pa_symbol.
765 void __init early_fixmap_init(void)
770 unsigned long addr = FIXADDR_START;
772 pgd = pgd_offset_k(addr);
773 if (CONFIG_PGTABLE_LEVELS > 3 &&
774 !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) {
776 * We only end up here if the kernel mapping and the fixmap
777 * share the top level pgd entry, which should only happen on
778 * 16k/4 levels configurations.
780 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
781 pud = pud_offset_kimg(pgd, addr);
784 __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE);
785 pud = fixmap_pud(addr);
788 __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE);
789 pmd = fixmap_pmd(addr);
790 __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
793 * The boot-ioremap range spans multiple pmds, for which
794 * we are not prepared:
796 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
797 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
799 if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
800 || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
802 pr_warn("pmd %p != %p, %p\n",
803 pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
804 fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
805 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
806 fix_to_virt(FIX_BTMAP_BEGIN));
807 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
808 fix_to_virt(FIX_BTMAP_END));
810 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
811 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
816 * Unusually, this is also called in IRQ context (ghes_iounmap_irq) so if we
817 * ever need to use IPIs for TLB broadcasting, then we're in trouble here.
819 void __set_fixmap(enum fixed_addresses idx,
820 phys_addr_t phys, pgprot_t flags)
822 unsigned long addr = __fix_to_virt(idx);
825 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
827 pte = fixmap_pte(addr);
829 if (pgprot_val(flags)) {
830 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
832 pte_clear(&init_mm, addr, pte);
833 flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
837 void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
839 const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
844 * Check whether the physical FDT address is set and meets the minimum
845 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
846 * at least 8 bytes so that we can always access the magic and size
847 * fields of the FDT header after mapping the first chunk, double check
848 * here if that is indeed the case.
850 BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
851 if (!dt_phys || dt_phys % MIN_FDT_ALIGN)
855 * Make sure that the FDT region can be mapped without the need to
856 * allocate additional translation table pages, so that it is safe
857 * to call create_mapping_noalloc() this early.
859 * On 64k pages, the FDT will be mapped using PTEs, so we need to
860 * be in the same PMD as the rest of the fixmap.
861 * On 4k pages, we'll use section mappings for the FDT so we only
862 * have to be in the same PUD.
864 BUILD_BUG_ON(dt_virt_base % SZ_2M);
866 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT !=
867 __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT);
869 offset = dt_phys % SWAPPER_BLOCK_SIZE;
870 dt_virt = (void *)dt_virt_base + offset;
872 /* map the first chunk so we can read the size from the header */
873 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
874 dt_virt_base, SWAPPER_BLOCK_SIZE, prot);
876 if (fdt_magic(dt_virt) != FDT_MAGIC)
879 *size = fdt_totalsize(dt_virt);
880 if (*size > MAX_FDT_SIZE)
883 if (offset + *size > SWAPPER_BLOCK_SIZE)
884 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base,
885 round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot);
890 void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
895 dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
899 memblock_reserve(dt_phys, size);
903 int __init arch_ioremap_pud_supported(void)
905 /* only 4k granule supports level 1 block mappings */
906 return IS_ENABLED(CONFIG_ARM64_4K_PAGES);
909 int __init arch_ioremap_pmd_supported(void)
914 int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
916 pgprot_t sect_prot = __pgprot(PUD_TYPE_SECT |
917 pgprot_val(mk_sect_prot(prot)));
918 BUG_ON(phys & ~PUD_MASK);
919 set_pud(pud, pfn_pud(__phys_to_pfn(phys), sect_prot));
923 int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
925 pgprot_t sect_prot = __pgprot(PMD_TYPE_SECT |
926 pgprot_val(mk_sect_prot(prot)));
927 BUG_ON(phys & ~PMD_MASK);
928 set_pmd(pmd, pfn_pmd(__phys_to_pfn(phys), sect_prot));
932 int pud_clear_huge(pud_t *pud)
940 int pmd_clear_huge(pmd_t *pmd)