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_PROT_NONE (_AT(pteval_t, 1) << 1) /* only when !PTE_VALID */
29 #define PTE_FILE (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
30 #define PTE_DIRTY (_AT(pteval_t, 1) << 55)
31 #define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
34 * VMALLOC and SPARSEMEM_VMEMMAP ranges.
36 #define VMALLOC_START UL(0xffffff8000000000)
37 #define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
39 #define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
41 #define FIRST_USER_ADDRESS 0
44 extern void __pte_error(const char *file, int line, unsigned long val);
45 extern void __pmd_error(const char *file, int line, unsigned long val);
46 extern void __pgd_error(const char *file, int line, unsigned long val);
48 #define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
49 #ifndef CONFIG_ARM64_64K_PAGES
50 #define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
52 #define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
55 * The pgprot_* and protection_map entries will be fixed up at runtime to
56 * include the cachable and bufferable bits based on memory policy, as well as
57 * any architecture dependent bits like global/ASID and SMP shared mapping
60 #define _PAGE_DEFAULT PTE_TYPE_PAGE | PTE_AF
62 extern pgprot_t pgprot_default;
64 #define __pgprot_modify(prot,mask,bits) \
65 __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
67 #define _MOD_PROT(p, b) __pgprot_modify(p, 0, b)
69 #define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE)
70 #define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
71 #define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
72 #define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
73 #define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
74 #define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
75 #define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
76 #define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)
77 #define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)
79 #define PAGE_HYP _MOD_PROT(pgprot_default, PTE_HYP)
80 #define PAGE_HYP_DEVICE __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
82 #define PAGE_S2 __pgprot_modify(pgprot_default, PTE_S2_MEMATTR_MASK, PTE_S2_MEMATTR(MT_S2_NORMAL) | PTE_S2_RDONLY)
83 #define PAGE_S2_DEVICE __pgprot(PROT_DEFAULT | PTE_S2_MEMATTR(MT_S2_DEVICE_nGnRE) | PTE_S2_RDWR | PTE_UXN)
85 #define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE)
86 #define __PAGE_SHARED __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
87 #define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
88 #define __PAGE_COPY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
89 #define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
90 #define __PAGE_READONLY __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
91 #define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
93 #endif /* __ASSEMBLY__ */
95 #define __P000 __PAGE_NONE
96 #define __P001 __PAGE_READONLY
97 #define __P010 __PAGE_COPY
98 #define __P011 __PAGE_COPY
99 #define __P100 __PAGE_READONLY_EXEC
100 #define __P101 __PAGE_READONLY_EXEC
101 #define __P110 __PAGE_COPY_EXEC
102 #define __P111 __PAGE_COPY_EXEC
104 #define __S000 __PAGE_NONE
105 #define __S001 __PAGE_READONLY
106 #define __S010 __PAGE_SHARED
107 #define __S011 __PAGE_SHARED
108 #define __S100 __PAGE_READONLY_EXEC
109 #define __S101 __PAGE_READONLY_EXEC
110 #define __S110 __PAGE_SHARED_EXEC
111 #define __S111 __PAGE_SHARED_EXEC
115 * ZERO_PAGE is a global shared page that is always zero: used
116 * for zero-mapped memory areas etc..
118 extern struct page *empty_zero_page;
119 #define ZERO_PAGE(vaddr) (empty_zero_page)
121 #define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
123 #define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
125 #define pte_none(pte) (!pte_val(pte))
126 #define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
127 #define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
128 #define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr))
130 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
131 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
132 #define pte_unmap(pte) do { } while (0)
133 #define pte_unmap_nested(pte) do { } while (0)
136 * The following only work if pte_present(). Undefined behaviour otherwise.
138 #define pte_present(pte) (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))
139 #define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY)
140 #define pte_young(pte) (pte_val(pte) & PTE_AF)
141 #define pte_special(pte) (pte_val(pte) & PTE_SPECIAL)
142 #define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY))
143 #define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
145 #define pte_valid_user(pte) \
146 ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
148 #define PTE_BIT_FUNC(fn,op) \
149 static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
151 PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
152 PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY);
153 PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY);
154 PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY);
155 PTE_BIT_FUNC(mkold, &= ~PTE_AF);
156 PTE_BIT_FUNC(mkyoung, |= PTE_AF);
157 PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);
159 static inline void set_pte(pte_t *ptep, pte_t pte)
164 extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
166 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
167 pte_t *ptep, pte_t pte)
169 if (pte_valid_user(pte)) {
171 __sync_icache_dcache(pte, addr);
173 pte = pte_wrprotect(pte);
180 * Huge pte definitions.
182 #define pte_huge(pte) ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE)
183 #define pte_mkhuge(pte) (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE))
185 #define __HAVE_ARCH_PTE_SPECIAL
188 * Mark the prot value as uncacheable and unbufferable.
190 #define pgprot_noncached(prot) \
191 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
192 #define pgprot_writecombine(prot) \
193 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
194 #define pgprot_dmacoherent(prot) \
195 __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
196 #define __HAVE_PHYS_MEM_ACCESS_PROT
198 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
199 unsigned long size, pgprot_t vma_prot);
201 #define pmd_none(pmd) (!pmd_val(pmd))
202 #define pmd_present(pmd) (pmd_val(pmd))
204 #define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
206 #define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
208 #define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
212 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
218 static inline void pmd_clear(pmd_t *pmdp)
220 set_pmd(pmdp, __pmd(0));
223 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
225 return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
228 #define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
231 * Conversion functions: convert a page and protection to a page entry,
232 * and a page entry and page directory to the page they refer to.
234 #define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
236 #ifndef CONFIG_ARM64_64K_PAGES
238 #define pud_none(pud) (!pud_val(pud))
239 #define pud_bad(pud) (!(pud_val(pud) & 2))
240 #define pud_present(pud) (pud_val(pud))
242 static inline void set_pud(pud_t *pudp, pud_t pud)
248 static inline void pud_clear(pud_t *pudp)
250 set_pud(pudp, __pud(0));
253 static inline pmd_t *pud_page_vaddr(pud_t pud)
255 return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
258 #endif /* CONFIG_ARM64_64K_PAGES */
260 /* to find an entry in a page-table-directory */
261 #define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
263 #define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
265 /* to find an entry in a kernel page-table-directory */
266 #define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
268 /* Find an entry in the second-level page table.. */
269 #ifndef CONFIG_ARM64_64K_PAGES
270 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
271 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
273 return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
277 /* Find an entry in the third-level page table.. */
278 #define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
280 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
282 const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
283 PTE_PROT_NONE | PTE_VALID;
284 pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
288 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
289 extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
291 #define SWAPPER_DIR_SIZE (3 * PAGE_SIZE)
292 #define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
295 * Encode and decode a swap entry:
296 * bits 0-1: present (must be zero)
298 * bits 3-8: swap type
299 * bits 9-63: swap offset
301 #define __SWP_TYPE_SHIFT 3
302 #define __SWP_TYPE_BITS 6
303 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
304 #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
306 #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
307 #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
308 #define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
310 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
311 #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
314 * Ensure that there are not more swap files than can be encoded in the kernel
317 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
320 * Encode and decode a file entry:
321 * bits 0-1: present (must be zero)
323 * bits 3-63: file offset / PAGE_SIZE
325 #define pte_file(pte) (pte_val(pte) & PTE_FILE)
326 #define pte_to_pgoff(x) (pte_val(x) >> 3)
327 #define pgoff_to_pte(x) __pte(((x) << 3) | PTE_FILE)
329 #define PTE_FILE_MAX_BITS 61
331 extern int kern_addr_valid(unsigned long addr);
333 #include <asm-generic/pgtable.h>
336 * remap a physical page `pfn' of size `size' with page protection `prot'
337 * into virtual address `from'
339 #define io_remap_pfn_range(vma,from,pfn,size,prot) \
340 remap_pfn_range(vma, from, pfn, size, prot)
342 #define pgtable_cache_init() do { } while (0)
344 #endif /* !__ASSEMBLY__ */
346 #endif /* __ASM_PGTABLE_H */