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 | PTE_NG;
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 /* Transitioning from Non-Global to Global is unsafe */
121 if (old & ~new & PTE_NG)
124 return ((old ^ new) & ~mask) == 0;
127 static void init_pte(pmd_t *pmd, unsigned long addr, unsigned long end,
128 phys_addr_t phys, pgprot_t prot)
132 pte = pte_set_fixmap_offset(pmd, addr);
134 pte_t old_pte = *pte;
136 set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot));
139 * After the PTE entry has been populated once, we
140 * only allow updates to the permission attributes.
142 BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte)));
145 } while (pte++, addr += PAGE_SIZE, addr != end);
150 static void alloc_init_cont_pte(pmd_t *pmd, unsigned long addr,
151 unsigned long end, phys_addr_t phys,
153 phys_addr_t (*pgtable_alloc)(void),
158 BUG_ON(pmd_sect(*pmd));
159 if (pmd_none(*pmd)) {
160 phys_addr_t pte_phys;
161 BUG_ON(!pgtable_alloc);
162 pte_phys = pgtable_alloc();
163 __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
165 BUG_ON(pmd_bad(*pmd));
168 pgprot_t __prot = prot;
170 next = pte_cont_addr_end(addr, end);
172 /* use a contiguous mapping if the range is suitably aligned */
173 if ((((addr | next | phys) & ~CONT_PTE_MASK) == 0) &&
174 (flags & NO_CONT_MAPPINGS) == 0)
175 __prot = __pgprot(pgprot_val(prot) | PTE_CONT);
177 init_pte(pmd, addr, next, phys, __prot);
180 } while (addr = next, addr != end);
183 static void init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
184 phys_addr_t phys, pgprot_t prot,
185 phys_addr_t (*pgtable_alloc)(void), int flags)
190 pmd = pmd_set_fixmap_offset(pud, addr);
192 pmd_t old_pmd = *pmd;
194 next = pmd_addr_end(addr, end);
196 /* try section mapping first */
197 if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
198 (flags & NO_BLOCK_MAPPINGS) == 0) {
199 pmd_set_huge(pmd, phys, prot);
202 * After the PMD entry has been populated once, we
203 * only allow updates to the permission attributes.
205 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
208 alloc_init_cont_pte(pmd, addr, next, phys, prot,
209 pgtable_alloc, flags);
211 BUG_ON(pmd_val(old_pmd) != 0 &&
212 pmd_val(old_pmd) != pmd_val(*pmd));
215 } while (pmd++, addr = next, addr != end);
220 static void alloc_init_cont_pmd(pud_t *pud, unsigned long addr,
221 unsigned long end, phys_addr_t phys,
223 phys_addr_t (*pgtable_alloc)(void), int flags)
228 * Check for initial section mappings in the pgd/pud.
230 BUG_ON(pud_sect(*pud));
231 if (pud_none(*pud)) {
232 phys_addr_t pmd_phys;
233 BUG_ON(!pgtable_alloc);
234 pmd_phys = pgtable_alloc();
235 __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE);
237 BUG_ON(pud_bad(*pud));
240 pgprot_t __prot = prot;
242 next = pmd_cont_addr_end(addr, end);
244 /* use a contiguous mapping if the range is suitably aligned */
245 if ((((addr | next | phys) & ~CONT_PMD_MASK) == 0) &&
246 (flags & NO_CONT_MAPPINGS) == 0)
247 __prot = __pgprot(pgprot_val(prot) | PTE_CONT);
249 init_pmd(pud, addr, next, phys, __prot, pgtable_alloc, flags);
252 } while (addr = next, addr != end);
255 static inline bool use_1G_block(unsigned long addr, unsigned long next,
258 if (PAGE_SHIFT != 12)
261 if (((addr | next | phys) & ~PUD_MASK) != 0)
267 static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
268 phys_addr_t phys, pgprot_t prot,
269 phys_addr_t (*pgtable_alloc)(void),
275 if (pgd_none(*pgd)) {
276 phys_addr_t pud_phys;
277 BUG_ON(!pgtable_alloc);
278 pud_phys = pgtable_alloc();
279 __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE);
281 BUG_ON(pgd_bad(*pgd));
283 pud = pud_set_fixmap_offset(pgd, addr);
285 pud_t old_pud = *pud;
287 next = pud_addr_end(addr, end);
290 * For 4K granule only, attempt to put down a 1GB block
292 if (use_1G_block(addr, next, phys) &&
293 (flags & NO_BLOCK_MAPPINGS) == 0) {
294 pud_set_huge(pud, phys, prot);
297 * After the PUD entry has been populated once, we
298 * only allow updates to the permission attributes.
300 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud),
303 alloc_init_cont_pmd(pud, addr, next, phys, prot,
304 pgtable_alloc, flags);
306 BUG_ON(pud_val(old_pud) != 0 &&
307 pud_val(old_pud) != pud_val(*pud));
310 } while (pud++, addr = next, addr != end);
315 static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
316 unsigned long virt, phys_addr_t size,
318 phys_addr_t (*pgtable_alloc)(void),
321 unsigned long addr, length, end, next;
322 pgd_t *pgd = pgd_offset_raw(pgdir, virt);
325 * If the virtual and physical address don't have the same offset
326 * within a page, we cannot map the region as the caller expects.
328 if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
332 addr = virt & PAGE_MASK;
333 length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
337 next = pgd_addr_end(addr, end);
338 alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc,
341 } while (pgd++, addr = next, addr != end);
344 static phys_addr_t pgd_pgtable_alloc(void)
346 void *ptr = (void *)__get_free_page(PGALLOC_GFP);
347 if (!ptr || !pgtable_page_ctor(virt_to_page(ptr)))
350 /* Ensure the zeroed page is visible to the page table walker */
356 * This function can only be used to modify existing table entries,
357 * without allocating new levels of table. Note that this permits the
358 * creation of new section or page entries.
360 static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
361 phys_addr_t size, pgprot_t prot)
363 if (virt < VMALLOC_START) {
364 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
368 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
372 void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
373 unsigned long virt, phys_addr_t size,
374 pgprot_t prot, bool page_mappings_only)
378 BUG_ON(mm == &init_mm);
380 if (page_mappings_only)
381 flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
383 __create_pgd_mapping(mm->pgd, phys, virt, size, prot,
384 pgd_pgtable_alloc, flags);
387 static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
388 phys_addr_t size, pgprot_t prot)
390 if (virt < VMALLOC_START) {
391 pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
396 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL,
399 /* flush the TLBs after updating live kernel mappings */
400 flush_tlb_kernel_range(virt, virt + size);
403 static void __init __map_memblock(pgd_t *pgd, phys_addr_t start,
404 phys_addr_t end, pgprot_t prot, int flags)
406 __create_pgd_mapping(pgd, start, __phys_to_virt(start), end - start,
407 prot, early_pgtable_alloc, flags);
410 void __init mark_linear_text_alias_ro(void)
413 * Remove the write permissions from the linear alias of .text/.rodata
415 update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text),
416 (unsigned long)__init_begin - (unsigned long)_text,
420 static void __init map_mem(pgd_t *pgd)
422 phys_addr_t kernel_start = __pa_symbol(_text);
423 phys_addr_t kernel_end = __pa_symbol(__init_begin);
424 struct memblock_region *reg;
427 if (debug_pagealloc_enabled())
428 flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
431 * Take care not to create a writable alias for the
432 * read-only text and rodata sections of the kernel image.
433 * So temporarily mark them as NOMAP to skip mappings in
434 * the following for-loop
436 memblock_mark_nomap(kernel_start, kernel_end - kernel_start);
437 #ifdef CONFIG_KEXEC_CORE
439 memblock_mark_nomap(crashk_res.start,
440 resource_size(&crashk_res));
443 /* map all the memory banks */
444 for_each_memblock(memory, reg) {
445 phys_addr_t start = reg->base;
446 phys_addr_t end = start + reg->size;
450 if (memblock_is_nomap(reg))
453 __map_memblock(pgd, start, end, PAGE_KERNEL, flags);
457 * Map the linear alias of the [_text, __init_begin) interval
458 * as non-executable now, and remove the write permission in
459 * mark_linear_text_alias_ro() below (which will be called after
460 * alternative patching has completed). This makes the contents
461 * of the region accessible to subsystems such as hibernate,
462 * but protects it from inadvertent modification or execution.
463 * Note that contiguous mappings cannot be remapped in this way,
464 * so we should avoid them here.
466 __map_memblock(pgd, kernel_start, kernel_end,
467 PAGE_KERNEL, NO_CONT_MAPPINGS);
468 memblock_clear_nomap(kernel_start, kernel_end - kernel_start);
470 #ifdef CONFIG_KEXEC_CORE
472 * Use page-level mappings here so that we can shrink the region
473 * in page granularity and put back unused memory to buddy system
474 * through /sys/kernel/kexec_crash_size interface.
476 if (crashk_res.end) {
477 __map_memblock(pgd, crashk_res.start, crashk_res.end + 1,
479 NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS);
480 memblock_clear_nomap(crashk_res.start,
481 resource_size(&crashk_res));
486 void mark_rodata_ro(void)
488 unsigned long section_size;
491 * mark .rodata as read only. Use __init_begin rather than __end_rodata
492 * to cover NOTES and EXCEPTION_TABLE.
494 section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata;
495 update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata,
496 section_size, PAGE_KERNEL_RO);
501 static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
502 pgprot_t prot, struct vm_struct *vma,
503 int flags, unsigned long vm_flags)
505 phys_addr_t pa_start = __pa_symbol(va_start);
506 unsigned long size = va_end - va_start;
508 BUG_ON(!PAGE_ALIGNED(pa_start));
509 BUG_ON(!PAGE_ALIGNED(size));
511 __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
512 early_pgtable_alloc, flags);
514 if (!(vm_flags & VM_NO_GUARD))
517 vma->addr = va_start;
518 vma->phys_addr = pa_start;
520 vma->flags = VM_MAP | vm_flags;
521 vma->caller = __builtin_return_address(0);
523 vm_area_add_early(vma);
526 static int __init parse_rodata(char *arg)
528 return strtobool(arg, &rodata_enabled);
530 early_param("rodata", parse_rodata);
532 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0
533 static int __init map_entry_trampoline(void)
536 extern char __entry_tramp_text_start[];
538 pgprot_t prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
539 phys_addr_t pa_start = __pa_symbol(__entry_tramp_text_start);
541 /* The trampoline is always mapped and can therefore be global */
542 pgprot_val(prot) &= ~PTE_NG;
544 /* Map only the text into the trampoline page table */
545 memset(tramp_pg_dir, 0, PGD_SIZE);
546 __create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS,
547 entry_tramp_text_size(), prot, pgd_pgtable_alloc,
550 /* Map both the text and data into the kernel page table */
551 for (i = 0; i < DIV_ROUND_UP(entry_tramp_text_size(), PAGE_SIZE); i++)
552 __set_fixmap(FIX_ENTRY_TRAMP_TEXT1 - i,
553 pa_start + i * PAGE_SIZE, prot);
555 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
556 extern char __entry_tramp_data_start[];
558 __set_fixmap(FIX_ENTRY_TRAMP_DATA,
559 __pa_symbol(__entry_tramp_data_start),
565 core_initcall(map_entry_trampoline);
569 * Create fine-grained mappings for the kernel.
571 static void __init map_kernel(pgd_t *pgd)
573 static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext,
574 vmlinux_initdata, vmlinux_data;
577 * External debuggers may need to write directly to the text
578 * mapping to install SW breakpoints. Allow this (only) when
579 * explicitly requested with rodata=off.
581 pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
584 * Only rodata will be remapped with different permissions later on,
585 * all other segments are allowed to use contiguous mappings.
587 map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text, 0,
589 map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL,
590 &vmlinux_rodata, NO_CONT_MAPPINGS, VM_NO_GUARD);
591 map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot,
592 &vmlinux_inittext, 0, VM_NO_GUARD);
593 map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL,
594 &vmlinux_initdata, 0, VM_NO_GUARD);
595 map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data, 0, 0);
597 if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) {
599 * The fixmap falls in a separate pgd to the kernel, and doesn't
600 * live in the carveout for the swapper_pg_dir. We can simply
601 * re-use the existing dir for the fixmap.
603 set_pgd(pgd_offset_raw(pgd, FIXADDR_START),
604 *pgd_offset_k(FIXADDR_START));
605 } else if (CONFIG_PGTABLE_LEVELS > 3) {
607 * The fixmap shares its top level pgd entry with the kernel
608 * mapping. This can really only occur when we are running
609 * with 16k/4 levels, so we can simply reuse the pud level
612 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
613 pud_populate(&init_mm, pud_set_fixmap_offset(pgd, FIXADDR_START),
620 kasan_copy_shadow(pgd);
624 * paging_init() sets up the page tables, initialises the zone memory
625 * maps and sets up the zero page.
627 void __init paging_init(void)
629 phys_addr_t pgd_phys = early_pgtable_alloc();
630 pgd_t *pgd = pgd_set_fixmap(pgd_phys);
636 * We want to reuse the original swapper_pg_dir so we don't have to
637 * communicate the new address to non-coherent secondaries in
638 * secondary_entry, and so cpu_switch_mm can generate the address with
639 * adrp+add rather than a load from some global variable.
641 * To do this we need to go via a temporary pgd.
643 cpu_replace_ttbr1(__va(pgd_phys));
644 memcpy(swapper_pg_dir, pgd, PGD_SIZE);
645 cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
648 memblock_free(pgd_phys, PAGE_SIZE);
651 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
654 memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE,
655 SWAPPER_DIR_SIZE - PAGE_SIZE);
659 * Check whether a kernel address is valid (derived from arch/x86/).
661 int kern_addr_valid(unsigned long addr)
668 if ((((long)addr) >> VA_BITS) != -1UL)
671 pgd = pgd_offset_k(addr);
675 pud = pud_offset(pgd, addr);
680 return pfn_valid(pud_pfn(*pud));
682 pmd = pmd_offset(pud, addr);
687 return pfn_valid(pmd_pfn(*pmd));
689 pte = pte_offset_kernel(pmd, addr);
693 return pfn_valid(pte_pfn(*pte));
695 #ifdef CONFIG_SPARSEMEM_VMEMMAP
696 #if !ARM64_SWAPPER_USES_SECTION_MAPS
697 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
699 return vmemmap_populate_basepages(start, end, node);
701 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
702 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
704 unsigned long addr = start;
711 next = pmd_addr_end(addr, end);
713 pgd = vmemmap_pgd_populate(addr, node);
717 pud = vmemmap_pud_populate(pgd, addr, node);
721 pmd = pmd_offset(pud, addr);
722 if (pmd_none(*pmd)) {
725 p = vmemmap_alloc_block_buf(PMD_SIZE, node);
729 pmd_set_huge(pmd, __pa(p), __pgprot(PROT_SECT_NORMAL));
731 vmemmap_verify((pte_t *)pmd, node, addr, next);
732 } while (addr = next, addr != end);
736 #endif /* CONFIG_ARM64_64K_PAGES */
737 void vmemmap_free(unsigned long start, unsigned long end)
740 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
742 static inline pud_t * fixmap_pud(unsigned long addr)
744 pgd_t *pgd = pgd_offset_k(addr);
746 BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd));
748 return pud_offset_kimg(pgd, addr);
751 static inline pmd_t * fixmap_pmd(unsigned long addr)
753 pud_t *pud = fixmap_pud(addr);
755 BUG_ON(pud_none(*pud) || pud_bad(*pud));
757 return pmd_offset_kimg(pud, addr);
760 static inline pte_t * fixmap_pte(unsigned long addr)
762 return &bm_pte[pte_index(addr)];
766 * The p*d_populate functions call virt_to_phys implicitly so they can't be used
767 * directly on kernel symbols (bm_p*d). This function is called too early to use
768 * lm_alias so __p*d_populate functions must be used to populate with the
769 * physical address from __pa_symbol.
771 void __init early_fixmap_init(void)
776 unsigned long addr = FIXADDR_START;
778 pgd = pgd_offset_k(addr);
779 if (CONFIG_PGTABLE_LEVELS > 3 &&
780 !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) {
782 * We only end up here if the kernel mapping and the fixmap
783 * share the top level pgd entry, which should only happen on
784 * 16k/4 levels configurations.
786 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
787 pud = pud_offset_kimg(pgd, addr);
790 __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE);
791 pud = fixmap_pud(addr);
794 __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE);
795 pmd = fixmap_pmd(addr);
796 __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
799 * The boot-ioremap range spans multiple pmds, for which
800 * we are not prepared:
802 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
803 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
805 if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
806 || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
808 pr_warn("pmd %p != %p, %p\n",
809 pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
810 fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
811 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
812 fix_to_virt(FIX_BTMAP_BEGIN));
813 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
814 fix_to_virt(FIX_BTMAP_END));
816 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
817 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
821 void __set_fixmap(enum fixed_addresses idx,
822 phys_addr_t phys, pgprot_t flags)
824 unsigned long addr = __fix_to_virt(idx);
827 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
829 pte = fixmap_pte(addr);
831 if (pgprot_val(flags)) {
832 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
834 pte_clear(&init_mm, addr, pte);
835 flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
839 void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
841 const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
846 * Check whether the physical FDT address is set and meets the minimum
847 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
848 * at least 8 bytes so that we can always access the magic and size
849 * fields of the FDT header after mapping the first chunk, double check
850 * here if that is indeed the case.
852 BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
853 if (!dt_phys || dt_phys % MIN_FDT_ALIGN)
857 * Make sure that the FDT region can be mapped without the need to
858 * allocate additional translation table pages, so that it is safe
859 * to call create_mapping_noalloc() this early.
861 * On 64k pages, the FDT will be mapped using PTEs, so we need to
862 * be in the same PMD as the rest of the fixmap.
863 * On 4k pages, we'll use section mappings for the FDT so we only
864 * have to be in the same PUD.
866 BUILD_BUG_ON(dt_virt_base % SZ_2M);
868 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT !=
869 __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT);
871 offset = dt_phys % SWAPPER_BLOCK_SIZE;
872 dt_virt = (void *)dt_virt_base + offset;
874 /* map the first chunk so we can read the size from the header */
875 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
876 dt_virt_base, SWAPPER_BLOCK_SIZE, prot);
878 if (fdt_magic(dt_virt) != FDT_MAGIC)
881 *size = fdt_totalsize(dt_virt);
882 if (*size > MAX_FDT_SIZE)
885 if (offset + *size > SWAPPER_BLOCK_SIZE)
886 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base,
887 round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot);
892 void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
897 dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
901 memblock_reserve(dt_phys, size);
905 int __init arch_ioremap_pud_supported(void)
908 * Only 4k granule supports level 1 block mappings.
909 * SW table walks can't handle removal of intermediate entries.
911 return IS_ENABLED(CONFIG_ARM64_4K_PAGES) &&
912 !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS);
915 int __init arch_ioremap_pmd_supported(void)
917 /* See arch_ioremap_pud_supported() */
918 return !IS_ENABLED(CONFIG_ARM64_PTDUMP_DEBUGFS);
921 int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot)
923 pgprot_t sect_prot = __pgprot(PUD_TYPE_SECT |
924 pgprot_val(mk_sect_prot(prot)));
925 pud_t new_pud = pfn_pud(__phys_to_pfn(phys), sect_prot);
927 /* Only allow permission changes for now */
928 if (!pgattr_change_is_safe(READ_ONCE(pud_val(*pudp)),
932 BUG_ON(phys & ~PUD_MASK);
933 set_pud(pudp, new_pud);
937 int pmd_set_huge(pmd_t *pmdp, phys_addr_t phys, pgprot_t prot)
939 pgprot_t sect_prot = __pgprot(PMD_TYPE_SECT |
940 pgprot_val(mk_sect_prot(prot)));
941 pmd_t new_pmd = pfn_pmd(__phys_to_pfn(phys), sect_prot);
943 /* Only allow permission changes for now */
944 if (!pgattr_change_is_safe(READ_ONCE(pmd_val(*pmdp)),
948 BUG_ON(phys & ~PMD_MASK);
949 set_pmd(pmdp, new_pmd);
953 int pud_clear_huge(pud_t *pud)
961 int pmd_clear_huge(pmd_t *pmd)
969 int pud_free_pmd_page(pud_t *pud, unsigned long addr)
971 return pud_none(*pud);
974 int pmd_free_pte_page(pmd_t *pmd, unsigned long addr)
976 return pmd_none(*pmd);