2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_PGTABLE_H
17 #define __ASM_PGTABLE_H
19 #include <asm/proc-fns.h>
21 #include <asm/memory.h>
22 #include <asm/pgtable-hwdef.h>
25 * Software defined PTE bits definition.
27 #define PTE_VALID (_AT(pteval_t, 1) << 0)
28 #define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
29 #define PTE_DIRTY (_AT(pteval_t, 1) << 55)
30 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
31 #define PTE_WRITE (_AT(pteval_t, 1) << 57)
32 #define PTE_PROT_NONE (_AT(pteval_t, 1) << 58) /* only when !PTE_VALID */
35 * VMALLOC and SPARSEMEM_VMEMMAP ranges.
37 #define VMALLOC_START UL(0xffffff8000000000)
38 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
40 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
42 #define FIRST_USER_ADDRESS 0
45 extern void __pte_error(const char *file, int line, unsigned long val);
46 extern void __pmd_error(const char *file, int line, unsigned long val);
47 extern void __pgd_error(const char *file, int line, unsigned long val);
49 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
50 #ifndef CONFIG_ARM64_64K_PAGES
51 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
53 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
56 * The pgprot_* and protection_map entries will be fixed up at runtime to
57 * include the cachable and bufferable bits based on memory policy, as well as
58 * any architecture dependent bits like global/ASID and SMP shared mapping
61 #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF
63 extern pgprot_t pgprot_default;
65 #define __pgprot_modify(prot,mask,bits) \
66 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
68 #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b)
70 #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_PXN | PTE_UXN)
71 #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
72 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
73 #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
74 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
75 #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
76 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
77 #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE)
78 #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY | PTE_WRITE)
80 #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_PXN | PTE_UXN)
81 #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_WRITE)
82 #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_WRITE)
83 #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
84 #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
85 #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
86 #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
88 #endif /* __ASSEMBLY__ */
90 #define __P000 __PAGE_NONE
91 #define __P001 __PAGE_READONLY
92 #define __P010 __PAGE_COPY
93 #define __P011 __PAGE_COPY
94 #define __P100 __PAGE_READONLY_EXEC
95 #define __P101 __PAGE_READONLY_EXEC
96 #define __P110 __PAGE_COPY_EXEC
97 #define __P111 __PAGE_COPY_EXEC
99 #define __S000 __PAGE_NONE
100 #define __S001 __PAGE_READONLY
101 #define __S010 __PAGE_SHARED
102 #define __S011 __PAGE_SHARED
103 #define __S100 __PAGE_READONLY_EXEC
104 #define __S101 __PAGE_READONLY_EXEC
105 #define __S110 __PAGE_SHARED_EXEC
106 #define __S111 __PAGE_SHARED_EXEC
110 * ZERO_PAGE is a global shared page that is always zero: used
111 * for zero-mapped memory areas etc..
113 extern struct page *empty_zero_page;
114 #define ZERO_PAGE(vaddr) (empty_zero_page)
116 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
118 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
120 #define pte_none(pte) (!pte_val(pte))
121 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
122 #define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
123 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr))
125 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
126 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
127 #define pte_unmap(pte) do { } while (0)
128 #define pte_unmap_nested(pte) do { } while (0)
131 * The following only work if pte_present(). Undefined behaviour otherwise.
133 #define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
134 #define pte_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY))
135 #define pte_young(pte) (!!(pte_val(pte) & PTE_AF))
136 #define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL))
137 #define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE))
138 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
140 #define pte_valid_user(pte) \
141 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
143 static inline pte_t pte_wrprotect(pte_t pte)
145 pte_val(pte) &= ~PTE_WRITE;
149 static inline pte_t pte_mkwrite(pte_t pte)
151 pte_val(pte) |= PTE_WRITE;
155 static inline pte_t pte_mkclean(pte_t pte)
157 pte_val(pte) &= ~PTE_DIRTY;
161 static inline pte_t pte_mkdirty(pte_t pte)
163 pte_val(pte) |= PTE_DIRTY;
167 static inline pte_t pte_mkold(pte_t pte)
169 pte_val(pte) &= ~PTE_AF;
173 static inline pte_t pte_mkyoung(pte_t pte)
175 pte_val(pte) |= PTE_AF;
179 static inline pte_t pte_mkspecial(pte_t pte)
181 pte_val(pte) |= PTE_SPECIAL;
185 static inline void set_pte(pte_t *ptep, pte_t pte)
190 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
192 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
193 pte_t *ptep, pte_t pte)
195 if (pte_valid_user(pte)) {
197 __sync_icache_dcache(pte, addr);
198 if (pte_dirty(pte) && pte_write(pte))
199 pte_val(pte) &= ~PTE_RDONLY;
201 pte_val(pte) |= PTE_RDONLY;
208 * Huge pte definitions.
210 #define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT))
211 #define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
214 * Hugetlb definitions.
216 #define HUGE_MAX_HSTATE 2
217 #define HPAGE_SHIFT PMD_SHIFT
218 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
219 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
220 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
222 #define __HAVE_ARCH_PTE_SPECIAL
225 * Software PMD bits for THP
228 #define PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55)
229 #define PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 57)
234 #define pmd_young(pmd) (pmd_val(pmd) & PMD_SECT_AF)
236 #define __HAVE_ARCH_PMD_WRITE
237 #define pmd_write(pmd) (!(pmd_val(pmd) & PMD_SECT_RDONLY))
239 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
240 #define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
241 #define pmd_trans_splitting(pmd) (pmd_val(pmd) & PMD_SECT_SPLITTING)
244 #define PMD_BIT_FUNC(fn,op) \
245 static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
247 PMD_BIT_FUNC(wrprotect, |= PMD_SECT_RDONLY);
248 PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF);
249 PMD_BIT_FUNC(mksplitting, |= PMD_SECT_SPLITTING);
250 PMD_BIT_FUNC(mkwrite, &= ~PMD_SECT_RDONLY);
251 PMD_BIT_FUNC(mkdirty, |= PMD_SECT_DIRTY);
252 PMD_BIT_FUNC(mkyoung, |= PMD_SECT_AF);
253 PMD_BIT_FUNC(mknotpresent, &= ~PMD_TYPE_MASK);
255 #define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
257 #define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
258 #define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
259 #define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
261 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
263 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
265 const pmdval_t mask = PMD_SECT_USER | PMD_SECT_PXN | PMD_SECT_UXN |
266 PMD_SECT_RDONLY | PMD_SECT_PROT_NONE |
268 pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask);
272 #define set_pmd_at(mm, addr, pmdp, pmd) set_pmd(pmdp, pmd)
274 static inline int has_transparent_hugepage(void)
280 * Mark the prot value as uncacheable and unbufferable.
282 #define pgprot_noncached(prot) \
283 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
284 #define pgprot_writecombine(prot) \
285 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
286 #define pgprot_dmacoherent(prot) \
287 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
288 #define __HAVE_PHYS_MEM_ACCESS_PROT
290 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
291 unsigned long size, pgprot_t vma_prot);
293 #define pmd_none(pmd) (!pmd_val(pmd))
294 #define pmd_present(pmd) (pmd_val(pmd))
296 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
298 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
304 static inline void pmd_clear(pmd_t *pmdp)
306 set_pmd(pmdp, __pmd(0));
309 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
311 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
314 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
317 * Conversion functions: convert a page and protection to a page entry,
318 * and a page entry and page directory to the page they refer to.
320 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
322 #ifndef CONFIG_ARM64_64K_PAGES
324 #define pud_none(pud) (!pud_val(pud))
325 #define pud_bad(pud) (!(pud_val(pud) & 2))
326 #define pud_present(pud) (pud_val(pud))
328 static inline void set_pud(pud_t *pudp, pud_t pud)
334 static inline void pud_clear(pud_t *pudp)
336 set_pud(pudp, __pud(0));
339 static inline pmd_t *pud_page_vaddr(pud_t pud)
341 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
344 #endif /* CONFIG_ARM64_64K_PAGES */
346 /* to find an entry in a page-table-directory */
347 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
349 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
351 /* to find an entry in a kernel page-table-directory */
352 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
354 /* Find an entry in the second-level page table.. */
355 #ifndef CONFIG_ARM64_64K_PAGES
356 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
357 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
359 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
363 /* Find an entry in the third-level page table.. */
364 #define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
366 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
368 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
369 PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
370 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
374 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
375 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
377 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE)
378 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
381 * Encode and decode a swap entry:
382 * bits 0-1: present (must be zero)
384 * bits 3-8: swap type
385 * bits 9-57: swap offset
387 #define __SWP_TYPE_SHIFT 3
388 #define __SWP_TYPE_BITS 6
389 #define __SWP_OFFSET_BITS 49
390 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
391 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
392 #define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1)
394 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
395 #define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
396 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
398 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
399 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
402 * Ensure that there are not more swap files than can be encoded in the kernel
405 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
408 * Encode and decode a file entry:
409 * bits 0-1: present (must be zero)
411 * bits 3-57: file offset / PAGE_SIZE
413 #define pte_file(pte) (pte_val(pte) & PTE_FILE)
414 #define pte_to_pgoff(x) (pte_val(x) >> 3)
415 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE)
417 #define PTE_FILE_MAX_BITS 55
419 extern int kern_addr_valid(unsigned long addr);
421 #include <asm-generic/pgtable.h>
424 * remap a physical page `pfn' of size `size' with page protection `prot'
425 * into virtual address `from'
427 #define io_remap_pfn_range(vma,from,pfn,size,prot) \
428 remap_pfn_range(vma, from, pfn, size, prot)
430 #define pgtable_cache_init() do { } while (0)
432 #endif /* !__ASSEMBLY__ */
434 #endif /* __ASM_PGTABLE_H */