Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-s390/pgtable.h |
| 3 | * |
| 4 | * S390 version |
| 5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation |
| 6 | * Author(s): Hartmut Penner (hp@de.ibm.com) |
| 7 | * Ulrich Weigand (weigand@de.ibm.com) |
| 8 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 9 | * |
| 10 | * Derived from "include/asm-i386/pgtable.h" |
| 11 | */ |
| 12 | |
| 13 | #ifndef _ASM_S390_PGTABLE_H |
| 14 | #define _ASM_S390_PGTABLE_H |
| 15 | |
| 16 | #include <asm-generic/4level-fixup.h> |
| 17 | |
| 18 | /* |
| 19 | * The Linux memory management assumes a three-level page table setup. For |
| 20 | * s390 31 bit we "fold" the mid level into the top-level page table, so |
| 21 | * that we physically have the same two-level page table as the s390 mmu |
| 22 | * expects in 31 bit mode. For s390 64 bit we use three of the five levels |
| 23 | * the hardware provides (region first and region second tables are not |
| 24 | * used). |
| 25 | * |
| 26 | * The "pgd_xxx()" functions are trivial for a folded two-level |
| 27 | * setup: the pgd is never bad, and a pmd always exists (as it's folded |
| 28 | * into the pgd entry) |
| 29 | * |
| 30 | * This file contains the functions and defines necessary to modify and use |
| 31 | * the S390 page table tree. |
| 32 | */ |
| 33 | #ifndef __ASSEMBLY__ |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 34 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/bug.h> |
| 36 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | struct vm_area_struct; /* forward declaration (include/linux/mm.h) */ |
Tim Schmielau | 8c65b4a | 2005-11-07 00:59:43 -0800 | [diff] [blame] | 39 | struct mm_struct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096))); |
| 42 | extern void paging_init(void); |
| 43 | |
| 44 | /* |
| 45 | * The S390 doesn't have any external MMU info: the kernel page |
| 46 | * tables contain all the necessary information. |
| 47 | */ |
| 48 | #define update_mmu_cache(vma, address, pte) do { } while (0) |
| 49 | |
| 50 | /* |
| 51 | * ZERO_PAGE is a global shared page that is always zero: used |
| 52 | * for zero-mapped memory areas etc.. |
| 53 | */ |
| 54 | extern char empty_zero_page[PAGE_SIZE]; |
| 55 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| 56 | #endif /* !__ASSEMBLY__ */ |
| 57 | |
| 58 | /* |
| 59 | * PMD_SHIFT determines the size of the area a second-level page |
| 60 | * table can map |
| 61 | * PGDIR_SHIFT determines what a third-level page table entry can map |
| 62 | */ |
| 63 | #ifndef __s390x__ |
| 64 | # define PMD_SHIFT 22 |
| 65 | # define PGDIR_SHIFT 22 |
| 66 | #else /* __s390x__ */ |
| 67 | # define PMD_SHIFT 21 |
| 68 | # define PGDIR_SHIFT 31 |
| 69 | #endif /* __s390x__ */ |
| 70 | |
| 71 | #define PMD_SIZE (1UL << PMD_SHIFT) |
| 72 | #define PMD_MASK (~(PMD_SIZE-1)) |
| 73 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| 74 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 75 | |
| 76 | /* |
| 77 | * entries per page directory level: the S390 is two-level, so |
| 78 | * we don't really have any PMD directory physically. |
| 79 | * for S390 segment-table entries are combined to one PGD |
| 80 | * that leads to 1024 pte per pgd |
| 81 | */ |
| 82 | #ifndef __s390x__ |
| 83 | # define PTRS_PER_PTE 1024 |
| 84 | # define PTRS_PER_PMD 1 |
| 85 | # define PTRS_PER_PGD 512 |
| 86 | #else /* __s390x__ */ |
| 87 | # define PTRS_PER_PTE 512 |
| 88 | # define PTRS_PER_PMD 1024 |
| 89 | # define PTRS_PER_PGD 2048 |
| 90 | #endif /* __s390x__ */ |
| 91 | |
Hugh Dickins | d455a36 | 2005-04-19 13:29:23 -0700 | [diff] [blame] | 92 | #define FIRST_USER_ADDRESS 0 |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | #define pte_ERROR(e) \ |
| 95 | printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e)) |
| 96 | #define pmd_ERROR(e) \ |
| 97 | printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e)) |
| 98 | #define pgd_ERROR(e) \ |
| 99 | printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e)) |
| 100 | |
| 101 | #ifndef __ASSEMBLY__ |
| 102 | /* |
| 103 | * Just any arbitrary offset to the start of the vmalloc VM area: the |
| 104 | * current 8MB value just means that there will be a 8MB "hole" after the |
| 105 | * physical memory until the kernel virtual memory starts. That means that |
| 106 | * any out-of-bounds memory accesses will hopefully be caught. |
| 107 | * The vmalloc() routines leaves a hole of 4kB between each vmalloced |
| 108 | * area for the same reason. ;) |
| 109 | */ |
| 110 | #define VMALLOC_OFFSET (8*1024*1024) |
| 111 | #define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) \ |
| 112 | & ~(VMALLOC_OFFSET-1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Heiko Carstens | 8b62bc9 | 2006-12-04 15:40:56 +0100 | [diff] [blame] | 114 | /* |
| 115 | * We need some free virtual space to be able to do vmalloc. |
| 116 | * VMALLOC_MIN_SIZE defines the minimum size of the vmalloc |
| 117 | * area. On a machine with 2GB memory we make sure that we |
| 118 | * have at least 128MB free space for vmalloc. On a machine |
| 119 | * with 4TB we make sure we have at least 1GB. |
| 120 | */ |
| 121 | #ifndef __s390x__ |
| 122 | #define VMALLOC_MIN_SIZE 0x8000000UL |
| 123 | #define VMALLOC_END 0x80000000UL |
| 124 | #else /* __s390x__ */ |
| 125 | #define VMALLOC_MIN_SIZE 0x40000000UL |
| 126 | #define VMALLOC_END 0x40000000000UL |
| 127 | #endif /* __s390x__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * A 31 bit pagetable entry of S390 has following format: |
| 131 | * | PFRA | | OS | |
| 132 | * 0 0IP0 |
| 133 | * 00000000001111111111222222222233 |
| 134 | * 01234567890123456789012345678901 |
| 135 | * |
| 136 | * I Page-Invalid Bit: Page is not available for address-translation |
| 137 | * P Page-Protection Bit: Store access not possible for page |
| 138 | * |
| 139 | * A 31 bit segmenttable entry of S390 has following format: |
| 140 | * | P-table origin | |PTL |
| 141 | * 0 IC |
| 142 | * 00000000001111111111222222222233 |
| 143 | * 01234567890123456789012345678901 |
| 144 | * |
| 145 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 146 | * C Common-Segment Bit: Segment is not private (PoP 3-30) |
| 147 | * PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256) |
| 148 | * |
| 149 | * The 31 bit segmenttable origin of S390 has following format: |
| 150 | * |
| 151 | * |S-table origin | | STL | |
| 152 | * X **GPS |
| 153 | * 00000000001111111111222222222233 |
| 154 | * 01234567890123456789012345678901 |
| 155 | * |
| 156 | * X Space-Switch event: |
| 157 | * G Segment-Invalid Bit: * |
| 158 | * P Private-Space Bit: Segment is not private (PoP 3-30) |
| 159 | * S Storage-Alteration: |
| 160 | * STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048) |
| 161 | * |
| 162 | * A 64 bit pagetable entry of S390 has following format: |
| 163 | * | PFRA |0IP0| OS | |
| 164 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 165 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 166 | * |
| 167 | * I Page-Invalid Bit: Page is not available for address-translation |
| 168 | * P Page-Protection Bit: Store access not possible for page |
| 169 | * |
| 170 | * A 64 bit segmenttable entry of S390 has following format: |
| 171 | * | P-table origin | TT |
| 172 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 173 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 174 | * |
| 175 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 176 | * C Common-Segment Bit: Segment is not private (PoP 3-30) |
| 177 | * P Page-Protection Bit: Store access not possible for page |
| 178 | * TT Type 00 |
| 179 | * |
| 180 | * A 64 bit region table entry of S390 has following format: |
| 181 | * | S-table origin | TF TTTL |
| 182 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 183 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 184 | * |
| 185 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 186 | * TT Type 01 |
| 187 | * TF |
| 188 | * TL Table lenght |
| 189 | * |
| 190 | * The 64 bit regiontable origin of S390 has following format: |
| 191 | * | region table origon | DTTL |
| 192 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 193 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 194 | * |
| 195 | * X Space-Switch event: |
| 196 | * G Segment-Invalid Bit: |
| 197 | * P Private-Space Bit: |
| 198 | * S Storage-Alteration: |
| 199 | * R Real space |
| 200 | * TL Table-Length: |
| 201 | * |
| 202 | * A storage key has the following format: |
| 203 | * | ACC |F|R|C|0| |
| 204 | * 0 3 4 5 6 7 |
| 205 | * ACC: access key |
| 206 | * F : fetch protection bit |
| 207 | * R : referenced bit |
| 208 | * C : changed bit |
| 209 | */ |
| 210 | |
| 211 | /* Hardware bits in the page table entry */ |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 212 | #define _PAGE_RO 0x200 /* HW read-only bit */ |
| 213 | #define _PAGE_INVALID 0x400 /* HW invalid bit */ |
| 214 | #define _PAGE_SWT 0x001 /* SW pte type bit t */ |
| 215 | #define _PAGE_SWX 0x002 /* SW pte type bit x */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 217 | /* Six different types of pages. */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 218 | #define _PAGE_TYPE_EMPTY 0x400 |
| 219 | #define _PAGE_TYPE_NONE 0x401 |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 220 | #define _PAGE_TYPE_SWAP 0x403 |
| 221 | #define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 222 | #define _PAGE_TYPE_RO 0x200 |
| 223 | #define _PAGE_TYPE_RW 0x000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 225 | /* |
| 226 | * PTE type bits are rather complicated. handle_pte_fault uses pte_present, |
| 227 | * pte_none and pte_file to find out the pte type WITHOUT holding the page |
| 228 | * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to |
| 229 | * invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs |
| 230 | * for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards. |
| 231 | * This change is done while holding the lock, but the intermediate step |
| 232 | * of a previously valid pte with the hw invalid bit set can be observed by |
| 233 | * handle_pte_fault. That makes it necessary that all valid pte types with |
| 234 | * the hw invalid bit set must be distinguishable from the four pte types |
| 235 | * empty, none, swap and file. |
| 236 | * |
| 237 | * irxt ipte irxt |
| 238 | * _PAGE_TYPE_EMPTY 1000 -> 1000 |
| 239 | * _PAGE_TYPE_NONE 1001 -> 1001 |
| 240 | * _PAGE_TYPE_SWAP 1011 -> 1011 |
| 241 | * _PAGE_TYPE_FILE 11?1 -> 11?1 |
| 242 | * _PAGE_TYPE_RO 0100 -> 1100 |
| 243 | * _PAGE_TYPE_RW 0000 -> 1000 |
| 244 | * |
| 245 | * pte_none is true for bits combinations 1000, 1100 |
| 246 | * pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001 |
| 247 | * pte_file is true for bits combinations 1101, 1111 |
| 248 | * swap pte is 1011 and 0001, 0011, 0101, 0111, 1010 and 1110 are invalid. |
| 249 | */ |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | #ifndef __s390x__ |
| 252 | |
| 253 | /* Bits in the segment table entry */ |
| 254 | #define _PAGE_TABLE_LEN 0xf /* only full page-tables */ |
| 255 | #define _PAGE_TABLE_COM 0x10 /* common page-table */ |
| 256 | #define _PAGE_TABLE_INV 0x20 /* invalid page-table */ |
| 257 | #define _SEG_PRESENT 0x001 /* Software (overlap with PTL) */ |
| 258 | |
| 259 | /* Bits int the storage key */ |
| 260 | #define _PAGE_CHANGED 0x02 /* HW changed bit */ |
| 261 | #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ |
| 262 | |
| 263 | #define _USER_SEG_TABLE_LEN 0x7f /* user-segment-table up to 2 GB */ |
| 264 | #define _KERNEL_SEG_TABLE_LEN 0x7f /* kernel-segment-table up to 2 GB */ |
| 265 | |
| 266 | /* |
| 267 | * User and Kernel pagetables are identical |
| 268 | */ |
| 269 | #define _PAGE_TABLE _PAGE_TABLE_LEN |
| 270 | #define _KERNPG_TABLE _PAGE_TABLE_LEN |
| 271 | |
| 272 | /* |
| 273 | * The Kernel segment-tables includes the User segment-table |
| 274 | */ |
| 275 | |
| 276 | #define _SEGMENT_TABLE (_USER_SEG_TABLE_LEN|0x80000000|0x100) |
| 277 | #define _KERNSEG_TABLE _KERNEL_SEG_TABLE_LEN |
| 278 | |
| 279 | #define USER_STD_MASK 0x00000080UL |
| 280 | |
| 281 | #else /* __s390x__ */ |
| 282 | |
| 283 | /* Bits in the segment table entry */ |
| 284 | #define _PMD_ENTRY_INV 0x20 /* invalid segment table entry */ |
| 285 | #define _PMD_ENTRY 0x00 |
| 286 | |
| 287 | /* Bits in the region third table entry */ |
| 288 | #define _PGD_ENTRY_INV 0x20 /* invalid region table entry */ |
| 289 | #define _PGD_ENTRY 0x07 |
| 290 | |
| 291 | /* |
| 292 | * User and kernel page directory |
| 293 | */ |
| 294 | #define _REGION_THIRD 0x4 |
| 295 | #define _REGION_THIRD_LEN 0x3 |
| 296 | #define _REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN|0x40|0x100) |
| 297 | #define _KERN_REGION_TABLE (_REGION_THIRD|_REGION_THIRD_LEN) |
| 298 | |
| 299 | #define USER_STD_MASK 0x0000000000000080UL |
| 300 | |
| 301 | /* Bits in the storage key */ |
| 302 | #define _PAGE_CHANGED 0x02 /* HW changed bit */ |
| 303 | #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ |
| 304 | |
| 305 | #endif /* __s390x__ */ |
| 306 | |
| 307 | /* |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 308 | * Page protection definitions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 310 | #define PAGE_NONE __pgprot(_PAGE_TYPE_NONE) |
| 311 | #define PAGE_RO __pgprot(_PAGE_TYPE_RO) |
| 312 | #define PAGE_RW __pgprot(_PAGE_TYPE_RW) |
| 313 | |
| 314 | #define PAGE_KERNEL PAGE_RW |
| 315 | #define PAGE_COPY PAGE_RO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | /* |
| 318 | * The S390 can't do page protection for execute, and considers that the |
| 319 | * same are read. Also, write permissions imply read permissions. This is |
| 320 | * the closest we can get.. |
| 321 | */ |
| 322 | /*xwr*/ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 323 | #define __P000 PAGE_NONE |
| 324 | #define __P001 PAGE_RO |
| 325 | #define __P010 PAGE_RO |
| 326 | #define __P011 PAGE_RO |
| 327 | #define __P100 PAGE_RO |
| 328 | #define __P101 PAGE_RO |
| 329 | #define __P110 PAGE_RO |
| 330 | #define __P111 PAGE_RO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 332 | #define __S000 PAGE_NONE |
| 333 | #define __S001 PAGE_RO |
| 334 | #define __S010 PAGE_RW |
| 335 | #define __S011 PAGE_RW |
| 336 | #define __S100 PAGE_RO |
| 337 | #define __S101 PAGE_RO |
| 338 | #define __S110 PAGE_RW |
| 339 | #define __S111 PAGE_RW |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | /* |
| 342 | * Certain architectures need to do special things when PTEs |
| 343 | * within a page table are directly modified. Thus, the following |
| 344 | * hook is made available. |
| 345 | */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 346 | static inline void set_pte(pte_t *pteptr, pte_t pteval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | { |
| 348 | *pteptr = pteval; |
| 349 | } |
| 350 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) |
| 351 | |
| 352 | /* |
| 353 | * pgd/pmd/pte query functions |
| 354 | */ |
| 355 | #ifndef __s390x__ |
| 356 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 357 | static inline int pgd_present(pgd_t pgd) { return 1; } |
| 358 | static inline int pgd_none(pgd_t pgd) { return 0; } |
| 359 | static inline int pgd_bad(pgd_t pgd) { return 0; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 361 | static inline int pmd_present(pmd_t pmd) { return pmd_val(pmd) & _SEG_PRESENT; } |
| 362 | static inline int pmd_none(pmd_t pmd) { return pmd_val(pmd) & _PAGE_TABLE_INV; } |
| 363 | static inline int pmd_bad(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | { |
| 365 | return (pmd_val(pmd) & (~PAGE_MASK & ~_PAGE_TABLE_INV)) != _PAGE_TABLE; |
| 366 | } |
| 367 | |
| 368 | #else /* __s390x__ */ |
| 369 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 370 | static inline int pgd_present(pgd_t pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
| 372 | return (pgd_val(pgd) & ~PAGE_MASK) == _PGD_ENTRY; |
| 373 | } |
| 374 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 375 | static inline int pgd_none(pgd_t pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
| 377 | return pgd_val(pgd) & _PGD_ENTRY_INV; |
| 378 | } |
| 379 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 380 | static inline int pgd_bad(pgd_t pgd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | { |
| 382 | return (pgd_val(pgd) & (~PAGE_MASK & ~_PGD_ENTRY_INV)) != _PGD_ENTRY; |
| 383 | } |
| 384 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 385 | static inline int pmd_present(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | { |
| 387 | return (pmd_val(pmd) & ~PAGE_MASK) == _PMD_ENTRY; |
| 388 | } |
| 389 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 390 | static inline int pmd_none(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
| 392 | return pmd_val(pmd) & _PMD_ENTRY_INV; |
| 393 | } |
| 394 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 395 | static inline int pmd_bad(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | { |
| 397 | return (pmd_val(pmd) & (~PAGE_MASK & ~_PMD_ENTRY_INV)) != _PMD_ENTRY; |
| 398 | } |
| 399 | |
| 400 | #endif /* __s390x__ */ |
| 401 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 402 | static inline int pte_none(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 404 | return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | } |
| 406 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 407 | static inline int pte_present(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 409 | unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX; |
| 410 | return (pte_val(pte) & mask) == _PAGE_TYPE_NONE || |
| 411 | (!(pte_val(pte) & _PAGE_INVALID) && |
| 412 | !(pte_val(pte) & _PAGE_SWT)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 415 | static inline int pte_file(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 417 | unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT; |
| 418 | return (pte_val(pte) & mask) == _PAGE_TYPE_FILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | #define pte_same(a,b) (pte_val(a) == pte_val(b)) |
| 422 | |
| 423 | /* |
| 424 | * query functions pte_write/pte_dirty/pte_young only work if |
| 425 | * pte_present() is true. Undefined behaviour if not.. |
| 426 | */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 427 | static inline int pte_write(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | { |
| 429 | return (pte_val(pte) & _PAGE_RO) == 0; |
| 430 | } |
| 431 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 432 | static inline int pte_dirty(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | { |
| 434 | /* A pte is neither clean nor dirty on s/390. The dirty bit |
| 435 | * is in the storage key. See page_test_and_clear_dirty for |
| 436 | * details. |
| 437 | */ |
| 438 | return 0; |
| 439 | } |
| 440 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 441 | static inline int pte_young(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
| 443 | /* A pte is neither young nor old on s/390. The young bit |
| 444 | * is in the storage key. See page_test_and_clear_young for |
| 445 | * details. |
| 446 | */ |
| 447 | return 0; |
| 448 | } |
| 449 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 450 | static inline int pte_read(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
| 452 | /* All pages are readable since we don't use the fetch |
| 453 | * protection bit in the storage key. |
| 454 | */ |
| 455 | return 1; |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * pgd/pmd/pte modification functions |
| 460 | */ |
| 461 | |
| 462 | #ifndef __s390x__ |
| 463 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 464 | static inline void pgd_clear(pgd_t * pgdp) { } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 466 | static inline void pmd_clear(pmd_t * pmdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | { |
| 468 | pmd_val(pmdp[0]) = _PAGE_TABLE_INV; |
| 469 | pmd_val(pmdp[1]) = _PAGE_TABLE_INV; |
| 470 | pmd_val(pmdp[2]) = _PAGE_TABLE_INV; |
| 471 | pmd_val(pmdp[3]) = _PAGE_TABLE_INV; |
| 472 | } |
| 473 | |
| 474 | #else /* __s390x__ */ |
| 475 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 476 | static inline void pgd_clear(pgd_t * pgdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
| 478 | pgd_val(*pgdp) = _PGD_ENTRY_INV | _PGD_ENTRY; |
| 479 | } |
| 480 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 481 | static inline void pmd_clear(pmd_t * pmdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
| 483 | pmd_val(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; |
| 484 | pmd_val1(*pmdp) = _PMD_ENTRY_INV | _PMD_ENTRY; |
| 485 | } |
| 486 | |
| 487 | #endif /* __s390x__ */ |
| 488 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 489 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | { |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 491 | pte_val(*ptep) = _PAGE_TYPE_EMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | } |
| 493 | |
| 494 | /* |
| 495 | * The following pte modification functions only work if |
| 496 | * pte_present() is true. Undefined behaviour if not.. |
| 497 | */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 498 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { |
| 500 | pte_val(pte) &= PAGE_MASK; |
| 501 | pte_val(pte) |= pgprot_val(newprot); |
| 502 | return pte; |
| 503 | } |
| 504 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 505 | static inline pte_t pte_wrprotect(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | { |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 507 | /* Do not clobber _PAGE_TYPE_NONE pages! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | if (!(pte_val(pte) & _PAGE_INVALID)) |
| 509 | pte_val(pte) |= _PAGE_RO; |
| 510 | return pte; |
| 511 | } |
| 512 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 513 | static inline pte_t pte_mkwrite(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | { |
| 515 | pte_val(pte) &= ~_PAGE_RO; |
| 516 | return pte; |
| 517 | } |
| 518 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 519 | static inline pte_t pte_mkclean(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | { |
| 521 | /* The only user of pte_mkclean is the fork() code. |
| 522 | We must *not* clear the *physical* page dirty bit |
| 523 | just because fork() wants to clear the dirty bit in |
| 524 | *one* of the page's mappings. So we just do nothing. */ |
| 525 | return pte; |
| 526 | } |
| 527 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 528 | static inline pte_t pte_mkdirty(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | { |
| 530 | /* We do not explicitly set the dirty bit because the |
| 531 | * sske instruction is slow. It is faster to let the |
| 532 | * next instruction set the dirty bit. |
| 533 | */ |
| 534 | return pte; |
| 535 | } |
| 536 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 537 | static inline pte_t pte_mkold(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
| 539 | /* S/390 doesn't keep its dirty/referenced bit in the pte. |
| 540 | * There is no point in clearing the real referenced bit. |
| 541 | */ |
| 542 | return pte; |
| 543 | } |
| 544 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 545 | static inline pte_t pte_mkyoung(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | { |
| 547 | /* S/390 doesn't keep its dirty/referenced bit in the pte. |
| 548 | * There is no point in setting the real referenced bit. |
| 549 | */ |
| 550 | return pte; |
| 551 | } |
| 552 | |
| 553 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) |
| 554 | { |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | static inline int |
| 559 | ptep_clear_flush_young(struct vm_area_struct *vma, |
| 560 | unsigned long address, pte_t *ptep) |
| 561 | { |
| 562 | /* No need to flush TLB; bits are in storage key */ |
| 563 | return ptep_test_and_clear_young(vma, address, ptep); |
| 564 | } |
| 565 | |
| 566 | static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) |
| 567 | { |
| 568 | return 0; |
| 569 | } |
| 570 | |
| 571 | static inline int |
| 572 | ptep_clear_flush_dirty(struct vm_area_struct *vma, |
| 573 | unsigned long address, pte_t *ptep) |
| 574 | { |
| 575 | /* No need to flush TLB; bits are in storage key */ |
| 576 | return ptep_test_and_clear_dirty(vma, address, ptep); |
| 577 | } |
| 578 | |
| 579 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
| 580 | { |
| 581 | pte_t pte = *ptep; |
| 582 | pte_clear(mm, addr, ptep); |
| 583 | return pte; |
| 584 | } |
| 585 | |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 586 | static inline void __ptep_ipte(unsigned long address, pte_t *ptep) |
| 587 | { |
| 588 | if (!(pte_val(*ptep) & _PAGE_INVALID)) { |
| 589 | #ifndef __s390x__ |
| 590 | /* S390 has 1mb segments, we are emulating 4MB segments */ |
| 591 | pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00); |
| 592 | #else |
| 593 | /* ipte in zarch mode can do the math */ |
| 594 | pte_t *pto = ptep; |
| 595 | #endif |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 596 | asm volatile( |
| 597 | " ipte %2,%3" |
| 598 | : "=m" (*ptep) : "m" (*ptep), |
| 599 | "a" (pto), "a" (address)); |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 600 | } |
| 601 | pte_val(*ptep) = _PAGE_TYPE_EMPTY; |
| 602 | } |
| 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | static inline pte_t |
| 605 | ptep_clear_flush(struct vm_area_struct *vma, |
| 606 | unsigned long address, pte_t *ptep) |
| 607 | { |
| 608 | pte_t pte = *ptep; |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 609 | |
| 610 | __ptep_ipte(address, ptep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | return pte; |
| 612 | } |
| 613 | |
| 614 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) |
| 615 | { |
| 616 | pte_t old_pte = *ptep; |
| 617 | set_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); |
| 618 | } |
| 619 | |
| 620 | static inline void |
| 621 | ptep_establish(struct vm_area_struct *vma, |
| 622 | unsigned long address, pte_t *ptep, |
| 623 | pte_t entry) |
| 624 | { |
| 625 | ptep_clear_flush(vma, address, ptep); |
| 626 | set_pte(ptep, entry); |
| 627 | } |
| 628 | |
| 629 | #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ |
| 630 | ptep_establish(__vma, __address, __ptep, __entry) |
| 631 | |
| 632 | /* |
| 633 | * Test and clear dirty bit in storage key. |
| 634 | * We can't clear the changed bit atomically. This is a potential |
| 635 | * race against modification of the referenced bit. This function |
| 636 | * should therefore only be called if it is not mapped in any |
| 637 | * address space. |
| 638 | */ |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 639 | static inline int page_test_and_clear_dirty(struct page *page) |
| 640 | { |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 641 | unsigned long physpage = page_to_phys(page); |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 642 | int skey = page_get_storage_key(physpage); |
| 643 | |
| 644 | if (skey & _PAGE_CHANGED) |
| 645 | page_set_storage_key(physpage, skey & ~_PAGE_CHANGED); |
| 646 | return skey & _PAGE_CHANGED; |
| 647 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
| 649 | /* |
| 650 | * Test and clear referenced bit in storage key. |
| 651 | */ |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 652 | static inline int page_test_and_clear_young(struct page *page) |
| 653 | { |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 654 | unsigned long physpage = page_to_phys(page); |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 655 | int ccode; |
| 656 | |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 657 | asm volatile( |
| 658 | " rrbe 0,%1\n" |
| 659 | " ipm %0\n" |
| 660 | " srl %0,28\n" |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 661 | : "=d" (ccode) : "a" (physpage) : "cc" ); |
| 662 | return ccode & 2; |
| 663 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | /* |
| 666 | * Conversion functions: convert a page and protection to a page entry, |
| 667 | * and a page entry and page directory to the page they refer to. |
| 668 | */ |
| 669 | static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) |
| 670 | { |
| 671 | pte_t __pte; |
| 672 | pte_val(__pte) = physpage + pgprot_val(pgprot); |
| 673 | return __pte; |
| 674 | } |
| 675 | |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 676 | static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) |
| 677 | { |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 678 | unsigned long physpage = page_to_phys(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 680 | return mk_pte_phys(physpage, pgprot); |
| 681 | } |
| 682 | |
| 683 | static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) |
| 684 | { |
| 685 | unsigned long physpage = __pa((pfn) << PAGE_SHIFT); |
| 686 | |
| 687 | return mk_pte_phys(physpage, pgprot); |
| 688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | #ifdef __s390x__ |
| 691 | |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 692 | static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot) |
| 693 | { |
| 694 | unsigned long physpage = __pa((pfn) << PAGE_SHIFT); |
| 695 | |
| 696 | return __pmd(physpage + pgprot_val(pgprot)); |
| 697 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | #endif /* __s390x__ */ |
| 700 | |
| 701 | #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) |
| 702 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
| 703 | |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 704 | #define pmd_page_vaddr(pmd) (pmd_val(pmd) & PAGE_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 706 | #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 708 | #define pgd_page_vaddr(pgd) (pgd_val(pgd) & PAGE_MASK) |
| 709 | |
Heiko Carstens | 0b2b6e1 | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 710 | #define pgd_page(pgd) pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | /* to find an entry in a page-table-directory */ |
| 713 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) |
| 714 | #define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address)) |
| 715 | |
| 716 | /* to find an entry in a kernel page-table-directory */ |
| 717 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| 718 | |
| 719 | #ifndef __s390x__ |
| 720 | |
| 721 | /* Find an entry in the second-level page table.. */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 722 | static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
| 724 | return (pmd_t *) dir; |
| 725 | } |
| 726 | |
| 727 | #else /* __s390x__ */ |
| 728 | |
| 729 | /* Find an entry in the second-level page table.. */ |
| 730 | #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) |
| 731 | #define pmd_offset(dir,addr) \ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 732 | ((pmd_t *) pgd_page_vaddr(*(dir)) + pmd_index(addr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | |
| 734 | #endif /* __s390x__ */ |
| 735 | |
| 736 | /* Find an entry in the third-level page table.. */ |
| 737 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) |
| 738 | #define pte_offset_kernel(pmd, address) \ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 739 | ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) |
| 741 | #define pte_offset_map_nested(pmd, address) pte_offset_kernel(pmd, address) |
| 742 | #define pte_unmap(pte) do { } while (0) |
| 743 | #define pte_unmap_nested(pte) do { } while (0) |
| 744 | |
| 745 | /* |
| 746 | * 31 bit swap entry format: |
| 747 | * A page-table entry has some bits we have to treat in a special way. |
| 748 | * Bits 0, 20 and bit 23 have to be zero, otherwise an specification |
| 749 | * exception will occur instead of a page translation exception. The |
| 750 | * specifiation exception has the bad habit not to store necessary |
| 751 | * information in the lowcore. |
| 752 | * Bit 21 and bit 22 are the page invalid bit and the page protection |
| 753 | * bit. We set both to indicate a swapped page. |
| 754 | * Bit 30 and 31 are used to distinguish the different page types. For |
| 755 | * a swapped page these bits need to be zero. |
| 756 | * This leaves the bits 1-19 and bits 24-29 to store type and offset. |
| 757 | * We use the 5 bits from 25-29 for the type and the 20 bits from 1-19 |
| 758 | * plus 24 for the offset. |
| 759 | * 0| offset |0110|o|type |00| |
| 760 | * 0 0000000001111111111 2222 2 22222 33 |
| 761 | * 0 1234567890123456789 0123 4 56789 01 |
| 762 | * |
| 763 | * 64 bit swap entry format: |
| 764 | * A page-table entry has some bits we have to treat in a special way. |
| 765 | * Bits 52 and bit 55 have to be zero, otherwise an specification |
| 766 | * exception will occur instead of a page translation exception. The |
| 767 | * specifiation exception has the bad habit not to store necessary |
| 768 | * information in the lowcore. |
| 769 | * Bit 53 and bit 54 are the page invalid bit and the page protection |
| 770 | * bit. We set both to indicate a swapped page. |
| 771 | * Bit 62 and 63 are used to distinguish the different page types. For |
| 772 | * a swapped page these bits need to be zero. |
| 773 | * This leaves the bits 0-51 and bits 56-61 to store type and offset. |
| 774 | * We use the 5 bits from 57-61 for the type and the 53 bits from 0-51 |
| 775 | * plus 56 for the offset. |
| 776 | * | offset |0110|o|type |00| |
| 777 | * 0000000000111111111122222222223333333333444444444455 5555 5 55566 66 |
| 778 | * 0123456789012345678901234567890123456789012345678901 2345 6 78901 23 |
| 779 | */ |
| 780 | #ifndef __s390x__ |
| 781 | #define __SWP_OFFSET_MASK (~0UL >> 12) |
| 782 | #else |
| 783 | #define __SWP_OFFSET_MASK (~0UL >> 11) |
| 784 | #endif |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 785 | static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
| 787 | pte_t pte; |
| 788 | offset &= __SWP_OFFSET_MASK; |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 789 | pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | ((offset & 1UL) << 7) | ((offset & ~1UL) << 11); |
| 791 | return pte; |
| 792 | } |
| 793 | |
| 794 | #define __swp_type(entry) (((entry).val >> 2) & 0x1f) |
| 795 | #define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1)) |
| 796 | #define __swp_entry(type,offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) }) |
| 797 | |
| 798 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| 799 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |
| 800 | |
| 801 | #ifndef __s390x__ |
| 802 | # define PTE_FILE_MAX_BITS 26 |
| 803 | #else /* __s390x__ */ |
| 804 | # define PTE_FILE_MAX_BITS 59 |
| 805 | #endif /* __s390x__ */ |
| 806 | |
| 807 | #define pte_to_pgoff(__pte) \ |
| 808 | ((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f)) |
| 809 | |
| 810 | #define pgoff_to_pte(__off) \ |
| 811 | ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 812 | | _PAGE_TYPE_FILE }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | #endif /* !__ASSEMBLY__ */ |
| 815 | |
| 816 | #define kern_addr_valid(addr) (1) |
| 817 | |
| 818 | /* |
| 819 | * No page table caches to initialise |
| 820 | */ |
| 821 | #define pgtable_cache_init() do { } while (0) |
| 822 | |
| 823 | #define __HAVE_ARCH_PTEP_ESTABLISH |
| 824 | #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
| 825 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
| 826 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
| 827 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY |
| 828 | #define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH |
| 829 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| 830 | #define __HAVE_ARCH_PTEP_CLEAR_FLUSH |
| 831 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| 832 | #define __HAVE_ARCH_PTE_SAME |
| 833 | #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_DIRTY |
| 834 | #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG |
| 835 | #include <asm-generic/pgtable.h> |
| 836 | |
| 837 | #endif /* _S390_PAGE_H */ |
| 838 | |