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/libfdt.h>
26 #include <linux/mman.h>
27 #include <linux/nodemask.h>
28 #include <linux/memblock.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>
44 #include <asm/ptdump.h>
46 #define NO_BLOCK_MAPPINGS BIT(0)
48 u64 idmap_t0sz = TCR_T0SZ(VA_BITS);
50 u64 kimage_voffset __ro_after_init;
51 EXPORT_SYMBOL(kimage_voffset);
54 * Empty_zero_page is a special page that is used for zero-initialized data
57 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
58 EXPORT_SYMBOL(empty_zero_page);
60 static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss;
61 static pmd_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss __maybe_unused;
62 static pud_t bm_pud[PTRS_PER_PUD] __page_aligned_bss __maybe_unused;
64 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
65 unsigned long size, pgprot_t vma_prot)
68 return pgprot_noncached(vma_prot);
69 else if (file->f_flags & O_SYNC)
70 return pgprot_writecombine(vma_prot);
73 EXPORT_SYMBOL(phys_mem_access_prot);
75 static phys_addr_t __init early_pgtable_alloc(void)
80 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
100 static bool pgattr_change_is_safe(u64 old, u64 new)
103 * The following mapping attributes may be updated in live
104 * kernel mappings without the need for break-before-make.
106 static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE;
108 /* creating or taking down mappings is always safe */
109 if (old == 0 || new == 0)
112 /* live contiguous mappings may not be manipulated at all */
113 if ((old | new) & PTE_CONT)
116 return ((old ^ new) & ~mask) == 0;
119 static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
120 unsigned long end, phys_addr_t phys,
122 phys_addr_t (*pgtable_alloc)(void))
126 BUG_ON(pmd_sect(*pmd));
127 if (pmd_none(*pmd)) {
128 phys_addr_t pte_phys;
129 BUG_ON(!pgtable_alloc);
130 pte_phys = pgtable_alloc();
131 __pmd_populate(pmd, pte_phys, PMD_TYPE_TABLE);
133 BUG_ON(pmd_bad(*pmd));
135 pte = pte_set_fixmap_offset(pmd, addr);
137 pte_t old_pte = *pte;
139 set_pte(pte, pfn_pte(__phys_to_pfn(phys), prot));
142 * After the PTE entry has been populated once, we
143 * only allow updates to the permission attributes.
145 BUG_ON(!pgattr_change_is_safe(pte_val(old_pte), pte_val(*pte)));
148 } while (pte++, addr += PAGE_SIZE, addr != end);
153 static void alloc_init_pmd(pud_t *pud, unsigned long addr, unsigned long end,
154 phys_addr_t phys, pgprot_t prot,
155 phys_addr_t (*pgtable_alloc)(void),
162 * Check for initial section mappings in the pgd/pud and remove them.
164 BUG_ON(pud_sect(*pud));
165 if (pud_none(*pud)) {
166 phys_addr_t pmd_phys;
167 BUG_ON(!pgtable_alloc);
168 pmd_phys = pgtable_alloc();
169 __pud_populate(pud, pmd_phys, PUD_TYPE_TABLE);
171 BUG_ON(pud_bad(*pud));
173 pmd = pmd_set_fixmap_offset(pud, addr);
175 pmd_t old_pmd = *pmd;
177 next = pmd_addr_end(addr, end);
179 /* try section mapping first */
180 if (((addr | next | phys) & ~SECTION_MASK) == 0 &&
181 (flags & NO_BLOCK_MAPPINGS) == 0) {
182 pmd_set_huge(pmd, phys, prot);
185 * After the PMD entry has been populated once, we
186 * only allow updates to the permission attributes.
188 BUG_ON(!pgattr_change_is_safe(pmd_val(old_pmd),
191 alloc_init_pte(pmd, addr, next, phys,
192 prot, pgtable_alloc);
194 BUG_ON(pmd_val(old_pmd) != 0 &&
195 pmd_val(old_pmd) != pmd_val(*pmd));
198 } while (pmd++, addr = next, addr != end);
203 static inline bool use_1G_block(unsigned long addr, unsigned long next,
206 if (PAGE_SHIFT != 12)
209 if (((addr | next | phys) & ~PUD_MASK) != 0)
215 static void alloc_init_pud(pgd_t *pgd, unsigned long addr, unsigned long end,
216 phys_addr_t phys, pgprot_t prot,
217 phys_addr_t (*pgtable_alloc)(void),
223 if (pgd_none(*pgd)) {
224 phys_addr_t pud_phys;
225 BUG_ON(!pgtable_alloc);
226 pud_phys = pgtable_alloc();
227 __pgd_populate(pgd, pud_phys, PUD_TYPE_TABLE);
229 BUG_ON(pgd_bad(*pgd));
231 pud = pud_set_fixmap_offset(pgd, addr);
233 pud_t old_pud = *pud;
235 next = pud_addr_end(addr, end);
238 * For 4K granule only, attempt to put down a 1GB block
240 if (use_1G_block(addr, next, phys) &&
241 (flags & NO_BLOCK_MAPPINGS) == 0) {
242 pud_set_huge(pud, phys, prot);
245 * After the PUD entry has been populated once, we
246 * only allow updates to the permission attributes.
248 BUG_ON(!pgattr_change_is_safe(pud_val(old_pud),
251 alloc_init_pmd(pud, addr, next, phys, prot,
252 pgtable_alloc, flags);
254 BUG_ON(pud_val(old_pud) != 0 &&
255 pud_val(old_pud) != pud_val(*pud));
258 } while (pud++, addr = next, addr != end);
263 static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
264 unsigned long virt, phys_addr_t size,
266 phys_addr_t (*pgtable_alloc)(void),
269 unsigned long addr, length, end, next;
270 pgd_t *pgd = pgd_offset_raw(pgdir, virt);
273 * If the virtual and physical address don't have the same offset
274 * within a page, we cannot map the region as the caller expects.
276 if (WARN_ON((phys ^ virt) & ~PAGE_MASK))
280 addr = virt & PAGE_MASK;
281 length = PAGE_ALIGN(size + (virt & ~PAGE_MASK));
285 next = pgd_addr_end(addr, end);
286 alloc_init_pud(pgd, addr, next, phys, prot, pgtable_alloc,
289 } while (pgd++, addr = next, addr != end);
292 static phys_addr_t pgd_pgtable_alloc(void)
294 void *ptr = (void *)__get_free_page(PGALLOC_GFP);
295 if (!ptr || !pgtable_page_ctor(virt_to_page(ptr)))
298 /* Ensure the zeroed page is visible to the page table walker */
304 * This function can only be used to modify existing table entries,
305 * without allocating new levels of table. Note that this permits the
306 * creation of new section or page entries.
308 static void __init create_mapping_noalloc(phys_addr_t phys, unsigned long virt,
309 phys_addr_t size, pgprot_t prot)
311 if (virt < VMALLOC_START) {
312 pr_warn("BUG: not creating mapping for %pa at 0x%016lx - outside kernel range\n",
316 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, 0);
319 void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
320 unsigned long virt, phys_addr_t size,
321 pgprot_t prot, bool page_mappings_only)
325 BUG_ON(mm == &init_mm);
327 if (page_mappings_only)
328 flags = NO_BLOCK_MAPPINGS;
330 __create_pgd_mapping(mm->pgd, phys, virt, size, prot,
331 pgd_pgtable_alloc, flags);
334 static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
335 phys_addr_t size, pgprot_t prot)
337 if (virt < VMALLOC_START) {
338 pr_warn("BUG: not updating mapping for %pa at 0x%016lx - outside kernel range\n",
343 __create_pgd_mapping(init_mm.pgd, phys, virt, size, prot, NULL, 0);
345 /* flush the TLBs after updating live kernel mappings */
346 flush_tlb_kernel_range(virt, virt + size);
349 static void __init __map_memblock(pgd_t *pgd, phys_addr_t start, phys_addr_t end)
351 phys_addr_t kernel_start = __pa_symbol(_text);
352 phys_addr_t kernel_end = __pa_symbol(__init_begin);
355 if (debug_pagealloc_enabled())
356 flags = NO_BLOCK_MAPPINGS;
359 * Take care not to create a writable alias for the
360 * read-only text and rodata sections of the kernel image.
363 /* No overlap with the kernel text/rodata */
364 if (end < kernel_start || start >= kernel_end) {
365 __create_pgd_mapping(pgd, start, __phys_to_virt(start),
366 end - start, PAGE_KERNEL,
367 early_pgtable_alloc, flags);
372 * This block overlaps the kernel text/rodata mappings.
373 * Map the portion(s) which don't overlap.
375 if (start < kernel_start)
376 __create_pgd_mapping(pgd, start,
377 __phys_to_virt(start),
378 kernel_start - start, PAGE_KERNEL,
379 early_pgtable_alloc, flags);
380 if (kernel_end < end)
381 __create_pgd_mapping(pgd, kernel_end,
382 __phys_to_virt(kernel_end),
383 end - kernel_end, PAGE_KERNEL,
384 early_pgtable_alloc, flags);
387 * Map the linear alias of the [_text, __init_begin) interval
388 * as non-executable now, and remove the write permission in
389 * mark_linear_text_alias_ro() below (which will be called after
390 * alternative patching has completed). This makes the contents
391 * of the region accessible to subsystems such as hibernate,
392 * but protects it from inadvertent modification or execution.
394 __create_pgd_mapping(pgd, kernel_start, __phys_to_virt(kernel_start),
395 kernel_end - kernel_start, PAGE_KERNEL,
396 early_pgtable_alloc, 0);
399 void __init mark_linear_text_alias_ro(void)
402 * Remove the write permissions from the linear alias of .text/.rodata
404 update_mapping_prot(__pa_symbol(_text), (unsigned long)lm_alias(_text),
405 (unsigned long)__init_begin - (unsigned long)_text,
409 static void __init map_mem(pgd_t *pgd)
411 struct memblock_region *reg;
413 /* map all the memory banks */
414 for_each_memblock(memory, reg) {
415 phys_addr_t start = reg->base;
416 phys_addr_t end = start + reg->size;
420 if (memblock_is_nomap(reg))
423 __map_memblock(pgd, start, end);
427 void mark_rodata_ro(void)
429 unsigned long section_size;
432 * mark .rodata as read only. Use __init_begin rather than __end_rodata
433 * to cover NOTES and EXCEPTION_TABLE.
435 section_size = (unsigned long)__init_begin - (unsigned long)__start_rodata;
436 update_mapping_prot(__pa_symbol(__start_rodata), (unsigned long)__start_rodata,
437 section_size, PAGE_KERNEL_RO);
442 static void __init map_kernel_segment(pgd_t *pgd, void *va_start, void *va_end,
443 pgprot_t prot, struct vm_struct *vma)
445 phys_addr_t pa_start = __pa_symbol(va_start);
446 unsigned long size = va_end - va_start;
448 BUG_ON(!PAGE_ALIGNED(pa_start));
449 BUG_ON(!PAGE_ALIGNED(size));
451 __create_pgd_mapping(pgd, pa_start, (unsigned long)va_start, size, prot,
452 early_pgtable_alloc, 0);
454 vma->addr = va_start;
455 vma->phys_addr = pa_start;
458 vma->caller = __builtin_return_address(0);
460 vm_area_add_early(vma);
463 static int __init parse_rodata(char *arg)
465 return strtobool(arg, &rodata_enabled);
467 early_param("rodata", parse_rodata);
470 * Create fine-grained mappings for the kernel.
472 static void __init map_kernel(pgd_t *pgd)
474 static struct vm_struct vmlinux_text, vmlinux_rodata, vmlinux_inittext,
475 vmlinux_initdata, vmlinux_data;
478 * External debuggers may need to write directly to the text
479 * mapping to install SW breakpoints. Allow this (only) when
480 * explicitly requested with rodata=off.
482 pgprot_t text_prot = rodata_enabled ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
484 map_kernel_segment(pgd, _text, _etext, text_prot, &vmlinux_text);
485 map_kernel_segment(pgd, __start_rodata, __inittext_begin, PAGE_KERNEL,
487 map_kernel_segment(pgd, __inittext_begin, __inittext_end, text_prot,
489 map_kernel_segment(pgd, __initdata_begin, __initdata_end, PAGE_KERNEL,
491 map_kernel_segment(pgd, _data, _end, PAGE_KERNEL, &vmlinux_data);
493 if (!pgd_val(*pgd_offset_raw(pgd, FIXADDR_START))) {
495 * The fixmap falls in a separate pgd to the kernel, and doesn't
496 * live in the carveout for the swapper_pg_dir. We can simply
497 * re-use the existing dir for the fixmap.
499 set_pgd(pgd_offset_raw(pgd, FIXADDR_START),
500 *pgd_offset_k(FIXADDR_START));
501 } else if (CONFIG_PGTABLE_LEVELS > 3) {
503 * The fixmap shares its top level pgd entry with the kernel
504 * mapping. This can really only occur when we are running
505 * with 16k/4 levels, so we can simply reuse the pud level
508 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
509 set_pud(pud_set_fixmap_offset(pgd, FIXADDR_START),
510 __pud(__pa_symbol(bm_pmd) | PUD_TYPE_TABLE));
516 kasan_copy_shadow(pgd);
520 * paging_init() sets up the page tables, initialises the zone memory
521 * maps and sets up the zero page.
523 void __init paging_init(void)
525 phys_addr_t pgd_phys = early_pgtable_alloc();
526 pgd_t *pgd = pgd_set_fixmap(pgd_phys);
532 * We want to reuse the original swapper_pg_dir so we don't have to
533 * communicate the new address to non-coherent secondaries in
534 * secondary_entry, and so cpu_switch_mm can generate the address with
535 * adrp+add rather than a load from some global variable.
537 * To do this we need to go via a temporary pgd.
539 cpu_replace_ttbr1(__va(pgd_phys));
540 memcpy(swapper_pg_dir, pgd, PGD_SIZE);
541 cpu_replace_ttbr1(lm_alias(swapper_pg_dir));
544 memblock_free(pgd_phys, PAGE_SIZE);
547 * We only reuse the PGD from the swapper_pg_dir, not the pud + pmd
550 memblock_free(__pa_symbol(swapper_pg_dir) + PAGE_SIZE,
551 SWAPPER_DIR_SIZE - PAGE_SIZE);
555 * Check whether a kernel address is valid (derived from arch/x86/).
557 int kern_addr_valid(unsigned long addr)
564 if ((((long)addr) >> VA_BITS) != -1UL)
567 pgd = pgd_offset_k(addr);
571 pud = pud_offset(pgd, addr);
576 return pfn_valid(pud_pfn(*pud));
578 pmd = pmd_offset(pud, addr);
583 return pfn_valid(pmd_pfn(*pmd));
585 pte = pte_offset_kernel(pmd, addr);
589 return pfn_valid(pte_pfn(*pte));
591 #ifdef CONFIG_SPARSEMEM_VMEMMAP
592 #if !ARM64_SWAPPER_USES_SECTION_MAPS
593 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
595 return vmemmap_populate_basepages(start, end, node);
597 #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */
598 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
600 unsigned long addr = start;
607 next = pmd_addr_end(addr, end);
609 pgd = vmemmap_pgd_populate(addr, node);
613 pud = vmemmap_pud_populate(pgd, addr, node);
617 pmd = pmd_offset(pud, addr);
618 if (pmd_none(*pmd)) {
621 p = vmemmap_alloc_block_buf(PMD_SIZE, node);
625 set_pmd(pmd, __pmd(__pa(p) | PROT_SECT_NORMAL));
627 vmemmap_verify((pte_t *)pmd, node, addr, next);
628 } while (addr = next, addr != end);
632 #endif /* CONFIG_ARM64_64K_PAGES */
633 void vmemmap_free(unsigned long start, unsigned long end)
636 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
638 static inline pud_t * fixmap_pud(unsigned long addr)
640 pgd_t *pgd = pgd_offset_k(addr);
642 BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd));
644 return pud_offset_kimg(pgd, addr);
647 static inline pmd_t * fixmap_pmd(unsigned long addr)
649 pud_t *pud = fixmap_pud(addr);
651 BUG_ON(pud_none(*pud) || pud_bad(*pud));
653 return pmd_offset_kimg(pud, addr);
656 static inline pte_t * fixmap_pte(unsigned long addr)
658 return &bm_pte[pte_index(addr)];
662 * The p*d_populate functions call virt_to_phys implicitly so they can't be used
663 * directly on kernel symbols (bm_p*d). This function is called too early to use
664 * lm_alias so __p*d_populate functions must be used to populate with the
665 * physical address from __pa_symbol.
667 void __init early_fixmap_init(void)
672 unsigned long addr = FIXADDR_START;
674 pgd = pgd_offset_k(addr);
675 if (CONFIG_PGTABLE_LEVELS > 3 &&
676 !(pgd_none(*pgd) || pgd_page_paddr(*pgd) == __pa_symbol(bm_pud))) {
678 * We only end up here if the kernel mapping and the fixmap
679 * share the top level pgd entry, which should only happen on
680 * 16k/4 levels configurations.
682 BUG_ON(!IS_ENABLED(CONFIG_ARM64_16K_PAGES));
683 pud = pud_offset_kimg(pgd, addr);
686 __pgd_populate(pgd, __pa_symbol(bm_pud), PUD_TYPE_TABLE);
687 pud = fixmap_pud(addr);
690 __pud_populate(pud, __pa_symbol(bm_pmd), PMD_TYPE_TABLE);
691 pmd = fixmap_pmd(addr);
692 __pmd_populate(pmd, __pa_symbol(bm_pte), PMD_TYPE_TABLE);
695 * The boot-ioremap range spans multiple pmds, for which
696 * we are not prepared:
698 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
699 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
701 if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)))
702 || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) {
704 pr_warn("pmd %p != %p, %p\n",
705 pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)),
706 fixmap_pmd(fix_to_virt(FIX_BTMAP_END)));
707 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
708 fix_to_virt(FIX_BTMAP_BEGIN));
709 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
710 fix_to_virt(FIX_BTMAP_END));
712 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
713 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
717 void __set_fixmap(enum fixed_addresses idx,
718 phys_addr_t phys, pgprot_t flags)
720 unsigned long addr = __fix_to_virt(idx);
723 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
725 pte = fixmap_pte(addr);
727 if (pgprot_val(flags)) {
728 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
730 pte_clear(&init_mm, addr, pte);
731 flush_tlb_kernel_range(addr, addr+PAGE_SIZE);
735 void *__init __fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot)
737 const u64 dt_virt_base = __fix_to_virt(FIX_FDT);
742 * Check whether the physical FDT address is set and meets the minimum
743 * alignment requirement. Since we are relying on MIN_FDT_ALIGN to be
744 * at least 8 bytes so that we can always access the magic and size
745 * fields of the FDT header after mapping the first chunk, double check
746 * here if that is indeed the case.
748 BUILD_BUG_ON(MIN_FDT_ALIGN < 8);
749 if (!dt_phys || dt_phys % MIN_FDT_ALIGN)
753 * Make sure that the FDT region can be mapped without the need to
754 * allocate additional translation table pages, so that it is safe
755 * to call create_mapping_noalloc() this early.
757 * On 64k pages, the FDT will be mapped using PTEs, so we need to
758 * be in the same PMD as the rest of the fixmap.
759 * On 4k pages, we'll use section mappings for the FDT so we only
760 * have to be in the same PUD.
762 BUILD_BUG_ON(dt_virt_base % SZ_2M);
764 BUILD_BUG_ON(__fix_to_virt(FIX_FDT_END) >> SWAPPER_TABLE_SHIFT !=
765 __fix_to_virt(FIX_BTMAP_BEGIN) >> SWAPPER_TABLE_SHIFT);
767 offset = dt_phys % SWAPPER_BLOCK_SIZE;
768 dt_virt = (void *)dt_virt_base + offset;
770 /* map the first chunk so we can read the size from the header */
771 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE),
772 dt_virt_base, SWAPPER_BLOCK_SIZE, prot);
774 if (fdt_magic(dt_virt) != FDT_MAGIC)
777 *size = fdt_totalsize(dt_virt);
778 if (*size > MAX_FDT_SIZE)
781 if (offset + *size > SWAPPER_BLOCK_SIZE)
782 create_mapping_noalloc(round_down(dt_phys, SWAPPER_BLOCK_SIZE), dt_virt_base,
783 round_up(offset + *size, SWAPPER_BLOCK_SIZE), prot);
788 void *__init fixmap_remap_fdt(phys_addr_t dt_phys)
793 dt_virt = __fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);
797 memblock_reserve(dt_phys, size);
801 int __init arch_ioremap_pud_supported(void)
803 /* only 4k granule supports level 1 block mappings */
804 return IS_ENABLED(CONFIG_ARM64_4K_PAGES);
807 int __init arch_ioremap_pmd_supported(void)
812 int pud_set_huge(pud_t *pud, phys_addr_t phys, pgprot_t prot)
814 BUG_ON(phys & ~PUD_MASK);
815 set_pud(pud, __pud(phys | PUD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
819 int pmd_set_huge(pmd_t *pmd, phys_addr_t phys, pgprot_t prot)
821 BUG_ON(phys & ~PMD_MASK);
822 set_pmd(pmd, __pmd(phys | PMD_TYPE_SECT | pgprot_val(mk_sect_prot(prot))));
826 int pud_clear_huge(pud_t *pud)
834 int pmd_clear_huge(pmd_t *pmd)