Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 1 | /* |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 2 | * include/asm-xtensa/pgtable.h |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 5 | * it under the terms of the GNU General Public License version 2 as |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 6 | * published by the Free Software Foundation. |
| 7 | * |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 8 | * Copyright (C) 2001 - 2013 Tensilica Inc. |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | #ifndef _XTENSA_PGTABLE_H |
| 12 | #define _XTENSA_PGTABLE_H |
| 13 | |
| 14 | #include <asm-generic/pgtable-nopmd.h> |
| 15 | #include <asm/page.h> |
| 16 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 17 | /* |
| 18 | * We only use two ring levels, user and kernel space. |
| 19 | */ |
| 20 | |
| 21 | #define USER_RING 1 /* user ring level */ |
| 22 | #define KERNEL_RING 0 /* kernel ring level */ |
| 23 | |
| 24 | /* |
| 25 | * The Xtensa architecture port of Linux has a two-level page table system, |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 26 | * i.e. the logical three-level Linux page table layout is folded. |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 27 | * Each task has the following memory page tables: |
| 28 | * |
| 29 | * PGD table (page directory), ie. 3rd-level page table: |
| 30 | * One page (4 kB) of 1024 (PTRS_PER_PGD) pointers to PTE tables |
| 31 | * (Architectures that don't have the PMD folded point to the PMD tables) |
| 32 | * |
| 33 | * The pointer to the PGD table for a given task can be retrieved from |
| 34 | * the task structure (struct task_struct*) t, e.g. current(): |
| 35 | * (t->mm ? t->mm : t->active_mm)->pgd |
| 36 | * |
| 37 | * PMD tables (page middle-directory), ie. 2nd-level page tables: |
| 38 | * Absent for the Xtensa architecture (folded, PTRS_PER_PMD == 1). |
| 39 | * |
| 40 | * PTE tables (page table entry), ie. 1st-level page tables: |
| 41 | * One page (4 kB) of 1024 (PTRS_PER_PTE) PTEs with a special PTE |
| 42 | * invalid_pte_table for absent mappings. |
| 43 | * |
| 44 | * The individual pages are 4 kB big with special pages for the empty_zero_page. |
| 45 | */ |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 46 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 47 | #define PGDIR_SHIFT 22 |
| 48 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| 49 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 50 | |
| 51 | /* |
| 52 | * Entries per page directory level: we use two-level, so |
| 53 | * we don't really have any PMD directory physically. |
| 54 | */ |
| 55 | #define PTRS_PER_PTE 1024 |
| 56 | #define PTRS_PER_PTE_SHIFT 10 |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 57 | #define PTRS_PER_PGD 1024 |
| 58 | #define PGD_ORDER 0 |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 59 | #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 60 | #define FIRST_USER_ADDRESS 0 |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 61 | #define FIRST_USER_PGD_NR (FIRST_USER_ADDRESS >> PGDIR_SHIFT) |
| 62 | |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 63 | /* |
| 64 | * Virtual memory area. We keep a distance to other memory regions to be |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 65 | * on the safe side. We also use this area for cache aliasing. |
| 66 | */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 67 | #define VMALLOC_START 0xC0000000 |
Chris Zankel | 3b4a49e | 2008-01-07 16:42:21 -0800 | [diff] [blame] | 68 | #define VMALLOC_END 0xC7FEFFFF |
| 69 | #define TLBTEMP_BASE_1 0xC7FF0000 |
| 70 | #define TLBTEMP_BASE_2 0xC7FF8000 |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 71 | |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 72 | /* |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 73 | * For the Xtensa architecture, the PTE layout is as follows: |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 74 | * |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 75 | * 31------12 11 10-9 8-6 5-4 3-2 1-0 |
| 76 | * +-----------------------------------------+ |
| 77 | * | | Software | HARDWARE | |
| 78 | * | PPN | ADW | RI |Attribute| |
| 79 | * +-----------------------------------------+ |
| 80 | * pte_none | MBZ | 01 | 11 | 00 | |
| 81 | * +-----------------------------------------+ |
| 82 | * present | PPN | 0 | 00 | ADW | RI | CA | wx | |
| 83 | * +- - - - - - - - - - - - - - - - - - - - -+ |
| 84 | * (PAGE_NONE)| PPN | 0 | 00 | ADW | 01 | 11 | 11 | |
| 85 | * +-----------------------------------------+ |
| 86 | * swap | index | type | 01 | 11 | 00 | |
| 87 | * +- - - - - - - - - - - - - - - - - - - - -+ |
| 88 | * file | file offset | 01 | 11 | 10 | |
| 89 | * +-----------------------------------------+ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 90 | * |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 91 | * For T1050 hardware and earlier the layout differs for present and (PAGE_NONE) |
| 92 | * +-----------------------------------------+ |
| 93 | * present | PPN | 0 | 00 | ADW | RI | CA | w1 | |
| 94 | * +-----------------------------------------+ |
| 95 | * (PAGE_NONE)| PPN | 0 | 00 | ADW | 01 | 01 | 00 | |
| 96 | * +-----------------------------------------+ |
| 97 | * |
| 98 | * Legend: |
| 99 | * PPN Physical Page Number |
| 100 | * ADW software: accessed (young) / dirty / writable |
| 101 | * RI ring (0=privileged, 1=user, 2 and 3 are unused) |
| 102 | * CA cache attribute: 00 bypass, 01 writeback, 10 writethrough |
| 103 | * (11 is invalid and used to mark pages that are not present) |
| 104 | * w page is writable (hw) |
| 105 | * x page is executable (hw) |
| 106 | * index swap offset / PAGE_SIZE (bit 11-31: 21 bits -> 8 GB) |
| 107 | * (note that the index is always non-zero) |
| 108 | * type swap type (5 bits -> 32 types) |
| 109 | * file offset 26-bit offset into the file, in increments of PAGE_SIZE |
| 110 | * |
| 111 | * Notes: |
| 112 | * - (PROT_NONE) is a special case of 'present' but causes an exception for |
| 113 | * any access (read, write, and execute). |
| 114 | * - 'multihit-exception' has the highest priority of all MMU exceptions, |
| 115 | * so the ring must be set to 'RING_USER' even for 'non-present' pages. |
| 116 | * - on older hardware, the exectuable flag was not supported and |
| 117 | * used as a 'valid' flag, so it needs to be always set. |
| 118 | * - we need to keep track of certain flags in software (dirty and young) |
| 119 | * to do this, we use write exceptions and have a separate software w-flag. |
| 120 | * - attribute value 1101 (and 1111 on T1050 and earlier) is reserved |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 121 | */ |
| 122 | |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 123 | #define _PAGE_ATTRIB_MASK 0xf |
| 124 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 125 | #define _PAGE_HW_EXEC (1<<0) /* hardware: page is executable */ |
| 126 | #define _PAGE_HW_WRITE (1<<1) /* hardware: page is writable */ |
| 127 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 128 | #define _PAGE_CA_BYPASS (0<<2) /* bypass, non-speculative */ |
| 129 | #define _PAGE_CA_WB (1<<2) /* write-back */ |
| 130 | #define _PAGE_CA_WT (2<<2) /* write-through */ |
| 131 | #define _PAGE_CA_MASK (3<<2) |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 132 | #define _PAGE_CA_INVALID (3<<2) |
| 133 | |
| 134 | /* We use invalid attribute values to distinguish special pte entries */ |
| 135 | #if XCHAL_HW_VERSION_MAJOR < 2000 |
| 136 | #define _PAGE_HW_VALID 0x01 /* older HW needed this bit set */ |
| 137 | #define _PAGE_NONE 0x04 |
| 138 | #else |
| 139 | #define _PAGE_HW_VALID 0x00 |
| 140 | #define _PAGE_NONE 0x0f |
| 141 | #endif |
| 142 | #define _PAGE_FILE (1<<1) /* file mapped page, only if !present */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 143 | |
| 144 | #define _PAGE_USER (1<<4) /* user access (ring=1) */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 145 | |
| 146 | /* Software */ |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 147 | #define _PAGE_WRITABLE_BIT 6 |
| 148 | #define _PAGE_WRITABLE (1<<6) /* software: page writable */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 149 | #define _PAGE_DIRTY (1<<7) /* software: page dirty */ |
| 150 | #define _PAGE_ACCESSED (1<<8) /* software: page accessed (read) */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 151 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 152 | #ifdef CONFIG_MMU |
| 153 | |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 154 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) |
| 155 | #define _PAGE_PRESENT (_PAGE_HW_VALID | _PAGE_CA_WB | _PAGE_ACCESSED) |
| 156 | |
| 157 | #define PAGE_NONE __pgprot(_PAGE_NONE | _PAGE_USER) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 158 | #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER) |
| 159 | #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC) |
| 160 | #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER) |
| 161 | #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_HW_EXEC) |
| 162 | #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE) |
| 163 | #define PAGE_SHARED_EXEC \ |
| 164 | __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE | _PAGE_HW_EXEC) |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 165 | #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_HW_WRITE) |
| 166 | #define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT|_PAGE_HW_WRITE|_PAGE_HW_EXEC) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 167 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 168 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 169 | # define _PAGE_DIRECTORY (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_BYPASS) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 170 | #else |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 171 | # define _PAGE_DIRECTORY (_PAGE_HW_VALID | _PAGE_ACCESSED | _PAGE_CA_WB) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 172 | #endif |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 173 | |
| 174 | #else /* no mmu */ |
| 175 | |
| 176 | # define PAGE_NONE __pgprot(0) |
| 177 | # define PAGE_SHARED __pgprot(0) |
| 178 | # define PAGE_COPY __pgprot(0) |
| 179 | # define PAGE_READONLY __pgprot(0) |
| 180 | # define PAGE_KERNEL __pgprot(0) |
| 181 | |
| 182 | #endif |
| 183 | |
| 184 | /* |
| 185 | * On certain configurations of Xtensa MMUs (eg. the initial Linux config), |
| 186 | * the MMU can't do page protection for execute, and considers that the same as |
| 187 | * read. Also, write permissions may imply read permissions. |
| 188 | * What follows is the closest we can get by reasonable means.. |
| 189 | * See linux/mm/mmap.c for protection_map[] array that uses these definitions. |
| 190 | */ |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 191 | #define __P000 PAGE_NONE /* private --- */ |
| 192 | #define __P001 PAGE_READONLY /* private --r */ |
| 193 | #define __P010 PAGE_COPY /* private -w- */ |
| 194 | #define __P011 PAGE_COPY /* private -wr */ |
| 195 | #define __P100 PAGE_READONLY_EXEC /* private x-- */ |
| 196 | #define __P101 PAGE_READONLY_EXEC /* private x-r */ |
| 197 | #define __P110 PAGE_COPY_EXEC /* private xw- */ |
| 198 | #define __P111 PAGE_COPY_EXEC /* private xwr */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 199 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 200 | #define __S000 PAGE_NONE /* shared --- */ |
| 201 | #define __S001 PAGE_READONLY /* shared --r */ |
| 202 | #define __S010 PAGE_SHARED /* shared -w- */ |
| 203 | #define __S011 PAGE_SHARED /* shared -wr */ |
| 204 | #define __S100 PAGE_READONLY_EXEC /* shared x-- */ |
| 205 | #define __S101 PAGE_READONLY_EXEC /* shared x-r */ |
| 206 | #define __S110 PAGE_SHARED_EXEC /* shared xw- */ |
| 207 | #define __S111 PAGE_SHARED_EXEC /* shared xwr */ |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 208 | |
| 209 | #ifndef __ASSEMBLY__ |
| 210 | |
| 211 | #define pte_ERROR(e) \ |
| 212 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
| 213 | #define pgd_ERROR(e) \ |
| 214 | printk("%s:%d: bad pgd entry %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
| 215 | |
| 216 | extern unsigned long empty_zero_page[1024]; |
| 217 | |
| 218 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| 219 | |
Johannes Weiner | e5083a6 | 2009-03-04 16:21:31 +0100 | [diff] [blame] | 220 | #ifdef CONFIG_MMU |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 221 | extern pgd_t swapper_pg_dir[PAGE_SIZE/sizeof(pgd_t)]; |
Johannes Weiner | e5083a6 | 2009-03-04 16:21:31 +0100 | [diff] [blame] | 222 | extern void paging_init(void); |
Johannes Weiner | e5083a6 | 2009-03-04 16:21:31 +0100 | [diff] [blame] | 223 | #else |
| 224 | # define swapper_pg_dir NULL |
| 225 | static inline void paging_init(void) { } |
Johannes Weiner | e5083a6 | 2009-03-04 16:21:31 +0100 | [diff] [blame] | 226 | #endif |
Kirill A. Shutemov | f820e28 | 2013-11-14 14:31:50 -0800 | [diff] [blame] | 227 | static inline void pgtable_cache_init(void) { } |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 228 | |
| 229 | /* |
| 230 | * The pmd contains the kernel virtual address of the pte page. |
| 231 | */ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 232 | #define pmd_page_vaddr(pmd) ((unsigned long)(pmd_val(pmd) & PAGE_MASK)) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 233 | #define pmd_page(pmd) virt_to_page(pmd_val(pmd)) |
| 234 | |
| 235 | /* |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 236 | * pte status. |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 237 | */ |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 238 | # define pte_none(pte) (pte_val(pte) == (_PAGE_CA_INVALID | _PAGE_USER)) |
| 239 | #if XCHAL_HW_VERSION_MAJOR < 2000 |
| 240 | # define pte_present(pte) ((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID) |
| 241 | #else |
| 242 | # define pte_present(pte) \ |
| 243 | (((pte_val(pte) & _PAGE_CA_MASK) != _PAGE_CA_INVALID) \ |
| 244 | || ((pte_val(pte) & _PAGE_ATTRIB_MASK) == _PAGE_NONE)) |
| 245 | #endif |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 246 | #define pte_clear(mm,addr,ptep) \ |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 247 | do { update_pte(ptep, __pte(_PAGE_CA_INVALID | _PAGE_USER)); } while (0) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 248 | |
| 249 | #define pmd_none(pmd) (!pmd_val(pmd)) |
| 250 | #define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 251 | #define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 252 | #define pmd_clear(pmdp) do { set_pmd(pmdp, __pmd(0)); } while (0) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 253 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 254 | static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; } |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 255 | static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } |
| 256 | static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } |
| 257 | static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; } |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 258 | static inline int pte_special(pte_t pte) { return 0; } |
| 259 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 260 | static inline pte_t pte_wrprotect(pte_t pte) |
| 261 | { pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; } |
| 262 | static inline pte_t pte_mkclean(pte_t pte) |
| 263 | { pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HW_WRITE); return pte; } |
| 264 | static inline pte_t pte_mkold(pte_t pte) |
| 265 | { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } |
| 266 | static inline pte_t pte_mkdirty(pte_t pte) |
| 267 | { pte_val(pte) |= _PAGE_DIRTY; return pte; } |
| 268 | static inline pte_t pte_mkyoung(pte_t pte) |
| 269 | { pte_val(pte) |= _PAGE_ACCESSED; return pte; } |
| 270 | static inline pte_t pte_mkwrite(pte_t pte) |
| 271 | { pte_val(pte) |= _PAGE_WRITABLE; return pte; } |
Nick Piggin | 7e67513 | 2008-04-28 02:13:00 -0700 | [diff] [blame] | 272 | static inline pte_t pte_mkspecial(pte_t pte) |
| 273 | { return pte; } |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 274 | |
| 275 | /* |
| 276 | * Conversion functions: convert a page and protection to a page entry, |
| 277 | * and a page entry and page directory to the page they refer to. |
| 278 | */ |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 279 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 280 | #define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT) |
| 281 | #define pte_same(a,b) (pte_val(a) == pte_val(b)) |
| 282 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
| 283 | #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) |
| 284 | #define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) |
| 285 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 286 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 287 | { |
| 288 | return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Certain architectures need to do special things when pte's |
| 293 | * within a page table are directly modified. Thus, the following |
| 294 | * hook is made available. |
| 295 | */ |
| 296 | static inline void update_pte(pte_t *ptep, pte_t pteval) |
| 297 | { |
| 298 | *ptep = pteval; |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 299 | #if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK |
| 300 | __asm__ __volatile__ ("dhwb %0, 0" :: "a" (ptep)); |
| 301 | #endif |
| 302 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 305 | struct mm_struct; |
| 306 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 307 | static inline void |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 308 | set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pteval) |
| 309 | { |
| 310 | update_pte(ptep, pteval); |
| 311 | } |
| 312 | |
| 313 | |
Adrian Bunk | d99cf71 | 2005-09-03 15:57:53 -0700 | [diff] [blame] | 314 | static inline void |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 315 | set_pmd(pmd_t *pmdp, pmd_t pmdval) |
| 316 | { |
| 317 | *pmdp = pmdval; |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 318 | } |
| 319 | |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 320 | struct vm_area_struct; |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 321 | |
| 322 | static inline int |
| 323 | ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, |
Chris Zankel | c4c4594 | 2012-11-28 16:53:51 -0800 | [diff] [blame] | 324 | pte_t *ptep) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 325 | { |
| 326 | pte_t pte = *ptep; |
| 327 | if (!pte_young(pte)) |
| 328 | return 0; |
| 329 | update_pte(ptep, pte_mkold(pte)); |
| 330 | return 1; |
| 331 | } |
| 332 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 333 | static inline pte_t |
| 334 | ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
| 335 | { |
| 336 | pte_t pte = *ptep; |
| 337 | pte_clear(mm, addr, ptep); |
| 338 | return pte; |
| 339 | } |
| 340 | |
| 341 | static inline void |
| 342 | ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
| 343 | { |
Chris Zankel | c4c4594 | 2012-11-28 16:53:51 -0800 | [diff] [blame] | 344 | pte_t pte = *ptep; |
| 345 | update_pte(ptep, pte_wrprotect(pte)); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* to find an entry in a kernel page-table-directory */ |
| 349 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| 350 | |
| 351 | /* to find an entry in a page-table-directory */ |
| 352 | #define pgd_offset(mm,address) ((mm)->pgd + pgd_index(address)) |
| 353 | |
| 354 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) |
| 355 | |
| 356 | /* Find an entry in the second-level page table.. */ |
| 357 | #define pmd_offset(dir,address) ((pmd_t*)(dir)) |
| 358 | |
| 359 | /* Find an entry in the third-level page table.. */ |
| 360 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) |
| 361 | #define pte_offset_kernel(dir,addr) \ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 362 | ((pte_t*) pmd_page_vaddr(*(dir)) + pte_index(addr)) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 363 | #define pte_offset_map(dir,addr) pte_offset_kernel((dir),(addr)) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 364 | #define pte_unmap(pte) do { } while (0) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 365 | |
| 366 | |
| 367 | /* |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 368 | * Encode and decode a swap and file entry. |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 369 | */ |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 370 | #define SWP_TYPE_BITS 5 |
| 371 | #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 372 | |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 373 | #define __swp_type(entry) (((entry).val >> 6) & 0x1f) |
| 374 | #define __swp_offset(entry) ((entry).val >> 11) |
| 375 | #define __swp_entry(type,offs) \ |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 376 | ((swp_entry_t){((type) << 6) | ((offs) << 11) | \ |
| 377 | _PAGE_CA_INVALID | _PAGE_USER}) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 378 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| 379 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |
| 380 | |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 381 | #define PTE_FILE_MAX_BITS 26 |
| 382 | #define pte_to_pgoff(pte) (pte_val(pte) >> 6) |
Chris Zankel | 01858d1 | 2007-08-06 23:57:57 -0700 | [diff] [blame] | 383 | #define pgoff_to_pte(off) \ |
Chris Zankel | 7711ece | 2013-05-20 11:09:13 -0700 | [diff] [blame] | 384 | ((pte_t) { ((off) << 6) | _PAGE_CA_INVALID | _PAGE_FILE | _PAGE_USER }) |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 385 | |
| 386 | #endif /* !defined (__ASSEMBLY__) */ |
| 387 | |
| 388 | |
| 389 | #ifdef __ASSEMBLY__ |
| 390 | |
| 391 | /* Assembly macro _PGD_INDEX is the same as C pgd_index(unsigned long), |
| 392 | * _PGD_OFFSET as C pgd_offset(struct mm_struct*, unsigned long), |
| 393 | * _PMD_OFFSET as C pmd_offset(pgd_t*, unsigned long) |
| 394 | * _PTE_OFFSET as C pte_offset(pmd_t*, unsigned long) |
| 395 | * |
| 396 | * Note: We require an additional temporary register which can be the same as |
| 397 | * the register that holds the address. |
| 398 | * |
| 399 | * ((pte_t*) ((unsigned long)(pmd_val(*pmd) & PAGE_MASK)) + pte_index(addr)) |
| 400 | * |
| 401 | */ |
| 402 | #define _PGD_INDEX(rt,rs) extui rt, rs, PGDIR_SHIFT, 32-PGDIR_SHIFT |
| 403 | #define _PTE_INDEX(rt,rs) extui rt, rs, PAGE_SHIFT, PTRS_PER_PTE_SHIFT |
| 404 | |
| 405 | #define _PGD_OFFSET(mm,adr,tmp) l32i mm, mm, MM_PGD; \ |
| 406 | _PGD_INDEX(tmp, adr); \ |
| 407 | addx4 mm, tmp, mm |
| 408 | |
| 409 | #define _PTE_OFFSET(pmd,adr,tmp) _PTE_INDEX(tmp, adr); \ |
| 410 | srli pmd, pmd, PAGE_SHIFT; \ |
| 411 | slli pmd, pmd, PAGE_SHIFT; \ |
| 412 | addx4 pmd, tmp, pmd |
| 413 | |
| 414 | #else |
| 415 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 416 | #define kern_addr_valid(addr) (1) |
| 417 | |
| 418 | extern void update_mmu_cache(struct vm_area_struct * vma, |
Russell King | 4b3073e | 2009-12-18 16:40:18 +0000 | [diff] [blame] | 419 | unsigned long address, pte_t *ptep); |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 420 | |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 421 | typedef pte_t *pte_addr_t; |
| 422 | |
| 423 | #endif /* !defined (__ASSEMBLY__) */ |
| 424 | |
| 425 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 426 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| 427 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| 428 | #define __HAVE_ARCH_PTEP_MKDIRTY |
| 429 | #define __HAVE_ARCH_PTE_SAME |
Max Filippov | de73b6b | 2012-12-22 06:35:04 +0400 | [diff] [blame] | 430 | /* We provide our own get_unmapped_area to cope with |
| 431 | * SHM area cache aliasing for userland. |
| 432 | */ |
| 433 | #define HAVE_ARCH_UNMAPPED_AREA |
Chris Zankel | 9a8fd55 | 2005-06-23 22:01:26 -0700 | [diff] [blame] | 434 | |
| 435 | #include <asm-generic/pgtable.h> |
| 436 | |
| 437 | #endif /* _XTENSA_PGTABLE_H */ |