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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | /* |
| 17 | * The Linux memory management assumes a three-level page table setup. For |
| 18 | * s390 31 bit we "fold" the mid level into the top-level page table, so |
| 19 | * that we physically have the same two-level page table as the s390 mmu |
| 20 | * expects in 31 bit mode. For s390 64 bit we use three of the five levels |
| 21 | * the hardware provides (region first and region second tables are not |
| 22 | * used). |
| 23 | * |
| 24 | * The "pgd_xxx()" functions are trivial for a folded two-level |
| 25 | * setup: the pgd is never bad, and a pmd always exists (as it's folded |
| 26 | * into the pgd entry) |
| 27 | * |
| 28 | * This file contains the functions and defines necessary to modify and use |
| 29 | * the S390 page table tree. |
| 30 | */ |
| 31 | #ifndef __ASSEMBLY__ |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 32 | #include <linux/mm_types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/bug.h> |
| 34 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096))); |
| 37 | extern void paging_init(void); |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 38 | extern void vmem_map_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | /* |
| 41 | * The S390 doesn't have any external MMU info: the kernel page |
| 42 | * tables contain all the necessary information. |
| 43 | */ |
| 44 | #define update_mmu_cache(vma, address, pte) do { } while (0) |
| 45 | |
| 46 | /* |
| 47 | * ZERO_PAGE is a global shared page that is always zero: used |
| 48 | * for zero-mapped memory areas etc.. |
| 49 | */ |
| 50 | extern char empty_zero_page[PAGE_SIZE]; |
| 51 | #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) |
| 52 | #endif /* !__ASSEMBLY__ */ |
| 53 | |
| 54 | /* |
| 55 | * PMD_SHIFT determines the size of the area a second-level page |
| 56 | * table can map |
| 57 | * PGDIR_SHIFT determines what a third-level page table entry can map |
| 58 | */ |
| 59 | #ifndef __s390x__ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 60 | # define PMD_SHIFT 20 |
| 61 | # define PUD_SHIFT 20 |
| 62 | # define PGDIR_SHIFT 20 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #else /* __s390x__ */ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 64 | # define PMD_SHIFT 20 |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 65 | # define PUD_SHIFT 31 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | # define PGDIR_SHIFT 31 |
| 67 | #endif /* __s390x__ */ |
| 68 | |
| 69 | #define PMD_SIZE (1UL << PMD_SHIFT) |
| 70 | #define PMD_MASK (~(PMD_SIZE-1)) |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 71 | #define PUD_SIZE (1UL << PUD_SHIFT) |
| 72 | #define PUD_MASK (~(PUD_SIZE-1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 82 | #define PTRS_PER_PTE 256 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | #ifndef __s390x__ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 84 | #define PTRS_PER_PMD 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #else /* __s390x__ */ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 86 | #define PTRS_PER_PMD 2048 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #endif /* __s390x__ */ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 88 | #define PTRS_PER_PUD 1 |
| 89 | #define PTRS_PER_PGD 2048 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Hugh Dickins | d455a36 | 2005-04-19 13:29:23 -0700 | [diff] [blame] | 91 | #define FIRST_USER_ADDRESS 0 |
| 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | #define pte_ERROR(e) \ |
| 94 | printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e)) |
| 95 | #define pmd_ERROR(e) \ |
| 96 | printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e)) |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 97 | #define pud_ERROR(e) \ |
| 98 | printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #define pgd_ERROR(e) \ |
| 100 | printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e)) |
| 101 | |
| 102 | #ifndef __ASSEMBLY__ |
| 103 | /* |
Christian Borntraeger | 5fd9c6e | 2008-01-26 14:11:00 +0100 | [diff] [blame] | 104 | * The vmalloc area will always be on the topmost area of the kernel |
| 105 | * mapping. We reserve 96MB (31bit) / 1GB (64bit) for vmalloc, |
| 106 | * which should be enough for any sane case. |
| 107 | * By putting vmalloc at the top, we maximise the gap between physical |
| 108 | * memory and vmalloc to catch misplaced memory accesses. As a side |
| 109 | * effect, this also makes sure that 64 bit module code cannot be used |
| 110 | * as system call address. |
Heiko Carstens | 8b62bc9 | 2006-12-04 15:40:56 +0100 | [diff] [blame] | 111 | */ |
| 112 | #ifndef __s390x__ |
Christian Borntraeger | 5fd9c6e | 2008-01-26 14:11:00 +0100 | [diff] [blame] | 113 | #define VMALLOC_START 0x78000000UL |
| 114 | #define VMALLOC_END 0x7e000000UL |
Heiko Carstens | 0189103 | 2008-02-05 16:50:49 +0100 | [diff] [blame] | 115 | #define VMEM_MAP_END 0x80000000UL |
Heiko Carstens | 8b62bc9 | 2006-12-04 15:40:56 +0100 | [diff] [blame] | 116 | #else /* __s390x__ */ |
Christian Borntraeger | 5fd9c6e | 2008-01-26 14:11:00 +0100 | [diff] [blame] | 117 | #define VMALLOC_START 0x3e000000000UL |
| 118 | #define VMALLOC_END 0x3e040000000UL |
Heiko Carstens | 0189103 | 2008-02-05 16:50:49 +0100 | [diff] [blame] | 119 | #define VMEM_MAP_END 0x40000000000UL |
Heiko Carstens | 8b62bc9 | 2006-12-04 15:40:56 +0100 | [diff] [blame] | 120 | #endif /* __s390x__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
Heiko Carstens | 0189103 | 2008-02-05 16:50:49 +0100 | [diff] [blame] | 122 | /* |
| 123 | * VMEM_MAX_PHYS is the highest physical address that can be added to the 1:1 |
| 124 | * mapping. This needs to be calculated at compile time since the size of the |
| 125 | * VMEM_MAP is static but the size of struct page can change. |
| 126 | */ |
Martin Schwidefsky | 522d8dc | 2008-02-09 18:24:31 +0100 | [diff] [blame] | 127 | #define VMEM_MAX_PAGES ((VMEM_MAP_END - VMALLOC_END) / sizeof(struct page)) |
| 128 | #define VMEM_MAX_PFN min(VMALLOC_START >> PAGE_SHIFT, VMEM_MAX_PAGES) |
| 129 | #define VMEM_MAX_PHYS ((VMEM_MAX_PFN << PAGE_SHIFT) & ~((16 << 20) - 1)) |
Christian Borntraeger | 5fd9c6e | 2008-01-26 14:11:00 +0100 | [diff] [blame] | 130 | #define VMEM_MAP ((struct page *) VMALLOC_END) |
Christian Borntraeger | 5fd9c6e | 2008-01-26 14:11:00 +0100 | [diff] [blame] | 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | /* |
| 133 | * A 31 bit pagetable entry of S390 has following format: |
| 134 | * | PFRA | | OS | |
| 135 | * 0 0IP0 |
| 136 | * 00000000001111111111222222222233 |
| 137 | * 01234567890123456789012345678901 |
| 138 | * |
| 139 | * I Page-Invalid Bit: Page is not available for address-translation |
| 140 | * P Page-Protection Bit: Store access not possible for page |
| 141 | * |
| 142 | * A 31 bit segmenttable entry of S390 has following format: |
| 143 | * | P-table origin | |PTL |
| 144 | * 0 IC |
| 145 | * 00000000001111111111222222222233 |
| 146 | * 01234567890123456789012345678901 |
| 147 | * |
| 148 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 149 | * C Common-Segment Bit: Segment is not private (PoP 3-30) |
| 150 | * PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256) |
| 151 | * |
| 152 | * The 31 bit segmenttable origin of S390 has following format: |
| 153 | * |
| 154 | * |S-table origin | | STL | |
| 155 | * X **GPS |
| 156 | * 00000000001111111111222222222233 |
| 157 | * 01234567890123456789012345678901 |
| 158 | * |
| 159 | * X Space-Switch event: |
| 160 | * G Segment-Invalid Bit: * |
| 161 | * P Private-Space Bit: Segment is not private (PoP 3-30) |
| 162 | * S Storage-Alteration: |
| 163 | * STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048) |
| 164 | * |
| 165 | * A 64 bit pagetable entry of S390 has following format: |
| 166 | * | PFRA |0IP0| OS | |
| 167 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 168 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 169 | * |
| 170 | * I Page-Invalid Bit: Page is not available for address-translation |
| 171 | * P Page-Protection Bit: Store access not possible for page |
| 172 | * |
| 173 | * A 64 bit segmenttable entry of S390 has following format: |
| 174 | * | P-table origin | TT |
| 175 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 176 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 177 | * |
| 178 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 179 | * C Common-Segment Bit: Segment is not private (PoP 3-30) |
| 180 | * P Page-Protection Bit: Store access not possible for page |
| 181 | * TT Type 00 |
| 182 | * |
| 183 | * A 64 bit region table entry of S390 has following format: |
| 184 | * | S-table origin | TF TTTL |
| 185 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 186 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 187 | * |
| 188 | * I Segment-Invalid Bit: Segment is not available for address-translation |
| 189 | * TT Type 01 |
| 190 | * TF |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 191 | * TL Table length |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | * |
| 193 | * The 64 bit regiontable origin of S390 has following format: |
| 194 | * | region table origon | DTTL |
| 195 | * 0000000000111111111122222222223333333333444444444455555555556666 |
| 196 | * 0123456789012345678901234567890123456789012345678901234567890123 |
| 197 | * |
| 198 | * X Space-Switch event: |
| 199 | * G Segment-Invalid Bit: |
| 200 | * P Private-Space Bit: |
| 201 | * S Storage-Alteration: |
| 202 | * R Real space |
| 203 | * TL Table-Length: |
| 204 | * |
| 205 | * A storage key has the following format: |
| 206 | * | ACC |F|R|C|0| |
| 207 | * 0 3 4 5 6 7 |
| 208 | * ACC: access key |
| 209 | * F : fetch protection bit |
| 210 | * R : referenced bit |
| 211 | * C : changed bit |
| 212 | */ |
| 213 | |
| 214 | /* Hardware bits in the page table entry */ |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 215 | #define _PAGE_RO 0x200 /* HW read-only bit */ |
| 216 | #define _PAGE_INVALID 0x400 /* HW invalid bit */ |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 217 | |
| 218 | /* Software bits in the page table entry */ |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 219 | #define _PAGE_SWT 0x001 /* SW pte type bit t */ |
| 220 | #define _PAGE_SWX 0x002 /* SW pte type bit x */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 222 | /* Six different types of pages. */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 223 | #define _PAGE_TYPE_EMPTY 0x400 |
| 224 | #define _PAGE_TYPE_NONE 0x401 |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 225 | #define _PAGE_TYPE_SWAP 0x403 |
| 226 | #define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 227 | #define _PAGE_TYPE_RO 0x200 |
| 228 | #define _PAGE_TYPE_RW 0x000 |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 229 | #define _PAGE_TYPE_EX_RO 0x202 |
| 230 | #define _PAGE_TYPE_EX_RW 0x002 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 232 | /* |
| 233 | * PTE type bits are rather complicated. handle_pte_fault uses pte_present, |
| 234 | * pte_none and pte_file to find out the pte type WITHOUT holding the page |
| 235 | * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to |
| 236 | * invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs |
| 237 | * for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards. |
| 238 | * This change is done while holding the lock, but the intermediate step |
| 239 | * of a previously valid pte with the hw invalid bit set can be observed by |
| 240 | * handle_pte_fault. That makes it necessary that all valid pte types with |
| 241 | * the hw invalid bit set must be distinguishable from the four pte types |
| 242 | * empty, none, swap and file. |
| 243 | * |
| 244 | * irxt ipte irxt |
| 245 | * _PAGE_TYPE_EMPTY 1000 -> 1000 |
| 246 | * _PAGE_TYPE_NONE 1001 -> 1001 |
| 247 | * _PAGE_TYPE_SWAP 1011 -> 1011 |
| 248 | * _PAGE_TYPE_FILE 11?1 -> 11?1 |
| 249 | * _PAGE_TYPE_RO 0100 -> 1100 |
| 250 | * _PAGE_TYPE_RW 0000 -> 1000 |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 251 | * _PAGE_TYPE_EX_RO 0110 -> 1110 |
| 252 | * _PAGE_TYPE_EX_RW 0010 -> 1010 |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 253 | * |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 254 | * pte_none is true for bits combinations 1000, 1010, 1100, 1110 |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 255 | * pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001 |
| 256 | * pte_file is true for bits combinations 1101, 1111 |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 257 | * swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid. |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 258 | */ |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | #ifndef __s390x__ |
| 261 | |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 262 | /* Bits in the segment table address-space-control-element */ |
| 263 | #define _ASCE_SPACE_SWITCH 0x80000000UL /* space switch event */ |
| 264 | #define _ASCE_ORIGIN_MASK 0x7ffff000UL /* segment table origin */ |
| 265 | #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ |
| 266 | #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ |
| 267 | #define _ASCE_TABLE_LENGTH 0x7f /* 128 x 64 entries = 8k */ |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* Bits in the segment table entry */ |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 270 | #define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */ |
| 271 | #define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */ |
| 272 | #define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */ |
| 273 | #define _SEGMENT_ENTRY_PTL 0x0f /* page table length */ |
| 274 | |
| 275 | #define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL) |
| 276 | #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) |
| 277 | |
| 278 | #else /* __s390x__ */ |
| 279 | |
| 280 | /* Bits in the segment/region table address-space-control-element */ |
| 281 | #define _ASCE_ORIGIN ~0xfffUL/* segment table origin */ |
| 282 | #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */ |
| 283 | #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */ |
| 284 | #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */ |
| 285 | #define _ASCE_REAL_SPACE 0x20 /* real space control */ |
| 286 | #define _ASCE_TYPE_MASK 0x0c /* asce table type mask */ |
| 287 | #define _ASCE_TYPE_REGION1 0x0c /* region first table type */ |
| 288 | #define _ASCE_TYPE_REGION2 0x08 /* region second table type */ |
| 289 | #define _ASCE_TYPE_REGION3 0x04 /* region third table type */ |
| 290 | #define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */ |
| 291 | #define _ASCE_TABLE_LENGTH 0x03 /* region table length */ |
| 292 | |
| 293 | /* Bits in the region table entry */ |
| 294 | #define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */ |
| 295 | #define _REGION_ENTRY_INV 0x20 /* invalid region table entry */ |
| 296 | #define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */ |
| 297 | #define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */ |
| 298 | #define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */ |
| 299 | #define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */ |
| 300 | #define _REGION_ENTRY_LENGTH 0x03 /* region third length */ |
| 301 | |
| 302 | #define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH) |
| 303 | #define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INV) |
| 304 | #define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH) |
| 305 | #define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INV) |
| 306 | #define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH) |
| 307 | #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV) |
| 308 | |
| 309 | /* Bits in the segment table entry */ |
| 310 | #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */ |
| 311 | #define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */ |
| 312 | #define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */ |
| 313 | |
| 314 | #define _SEGMENT_ENTRY (0) |
| 315 | #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV) |
| 316 | |
| 317 | #endif /* __s390x__ */ |
| 318 | |
| 319 | /* |
| 320 | * A user page table pointer has the space-switch-event bit, the |
| 321 | * private-space-control bit and the storage-alteration-event-control |
| 322 | * bit set. A kernel page table pointer doesn't need them. |
| 323 | */ |
| 324 | #define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \ |
| 325 | _ASCE_ALT_EVENT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
| 327 | /* Bits int the storage key */ |
| 328 | #define _PAGE_CHANGED 0x02 /* HW changed bit */ |
| 329 | #define _PAGE_REFERENCED 0x04 /* HW referenced bit */ |
| 330 | |
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 | * Page protection definitions. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 334 | #define PAGE_NONE __pgprot(_PAGE_TYPE_NONE) |
| 335 | #define PAGE_RO __pgprot(_PAGE_TYPE_RO) |
| 336 | #define PAGE_RW __pgprot(_PAGE_TYPE_RW) |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 337 | #define PAGE_EX_RO __pgprot(_PAGE_TYPE_EX_RO) |
| 338 | #define PAGE_EX_RW __pgprot(_PAGE_TYPE_EX_RW) |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 339 | |
| 340 | #define PAGE_KERNEL PAGE_RW |
| 341 | #define PAGE_COPY PAGE_RO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | |
| 343 | /* |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 344 | * Dependent on the EXEC_PROTECT option s390 can do execute protection. |
| 345 | * Write permission always implies read permission. In theory with a |
| 346 | * primary/secondary page table execute only can be implemented but |
| 347 | * it would cost an additional bit in the pte to distinguish all the |
| 348 | * different pte types. To avoid that execute permission currently |
| 349 | * implies read permission as well. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | */ |
| 351 | /*xwr*/ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 352 | #define __P000 PAGE_NONE |
| 353 | #define __P001 PAGE_RO |
| 354 | #define __P010 PAGE_RO |
| 355 | #define __P011 PAGE_RO |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 356 | #define __P100 PAGE_EX_RO |
| 357 | #define __P101 PAGE_EX_RO |
| 358 | #define __P110 PAGE_EX_RO |
| 359 | #define __P111 PAGE_EX_RO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 361 | #define __S000 PAGE_NONE |
| 362 | #define __S001 PAGE_RO |
| 363 | #define __S010 PAGE_RW |
| 364 | #define __S011 PAGE_RW |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 365 | #define __S100 PAGE_EX_RO |
| 366 | #define __S101 PAGE_EX_RO |
| 367 | #define __S110 PAGE_EX_RW |
| 368 | #define __S111 PAGE_EX_RW |
| 369 | |
| 370 | #ifndef __s390x__ |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 371 | # define PxD_SHADOW_SHIFT 1 |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 372 | #else /* __s390x__ */ |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 373 | # define PxD_SHADOW_SHIFT 2 |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 374 | #endif /* __s390x__ */ |
| 375 | |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 376 | static inline void *get_shadow_table(void *table) |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 377 | { |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 378 | unsigned long addr, offset; |
| 379 | struct page *page; |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 380 | |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 381 | addr = (unsigned long) table; |
| 382 | offset = addr & ((PAGE_SIZE << PxD_SHADOW_SHIFT) - 1); |
| 383 | page = virt_to_page((void *)(addr ^ offset)); |
| 384 | return (void *)(addr_t)(page->index ? (page->index | offset) : 0UL); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
| 387 | /* |
| 388 | * Certain architectures need to do special things when PTEs |
| 389 | * within a page table are directly modified. Thus, the following |
| 390 | * hook is made available. |
| 391 | */ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 392 | static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 393 | pte_t *ptep, pte_t entry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 395 | *ptep = entry; |
| 396 | if (mm->context.noexec) { |
| 397 | if (!(pte_val(entry) & _PAGE_INVALID) && |
| 398 | (pte_val(entry) & _PAGE_SWX)) |
| 399 | pte_val(entry) |= _PAGE_RO; |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 400 | else |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 401 | pte_val(entry) = _PAGE_TYPE_EMPTY; |
| 402 | ptep[PTRS_PER_PTE] = entry; |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * pgd/pmd/pte query functions |
| 408 | */ |
| 409 | #ifndef __s390x__ |
| 410 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 411 | static inline int pgd_present(pgd_t pgd) { return 1; } |
| 412 | static inline int pgd_none(pgd_t pgd) { return 0; } |
| 413 | static inline int pgd_bad(pgd_t pgd) { return 0; } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 415 | static inline int pud_present(pud_t pud) { return 1; } |
| 416 | static inline int pud_none(pud_t pud) { return 0; } |
| 417 | static inline int pud_bad(pud_t pud) { return 0; } |
| 418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | #else /* __s390x__ */ |
| 420 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 421 | static inline int pgd_present(pgd_t pgd) { return 1; } |
| 422 | static inline int pgd_none(pgd_t pgd) { return 0; } |
| 423 | static inline int pgd_bad(pgd_t pgd) { return 0; } |
| 424 | |
| 425 | static inline int pud_present(pud_t pud) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
Martin Schwidefsky | 0d01792 | 2007-12-17 16:25:48 +0100 | [diff] [blame] | 427 | return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 430 | static inline int pud_none(pud_t pud) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | { |
Martin Schwidefsky | 0d01792 | 2007-12-17 16:25:48 +0100 | [diff] [blame] | 432 | return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } |
| 434 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 435 | static inline int pud_bad(pud_t pud) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | { |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 437 | unsigned long mask = ~_REGION_ENTRY_ORIGIN & ~_REGION_ENTRY_INV; |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 438 | return (pud_val(pud) & mask) != _REGION3_ENTRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 441 | #endif /* __s390x__ */ |
| 442 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 443 | static inline int pmd_present(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
Martin Schwidefsky | 0d01792 | 2007-12-17 16:25:48 +0100 | [diff] [blame] | 445 | return (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) != 0UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 448 | static inline int pmd_none(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | { |
Martin Schwidefsky | 0d01792 | 2007-12-17 16:25:48 +0100 | [diff] [blame] | 450 | return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) != 0UL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | } |
| 452 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 453 | static inline int pmd_bad(pmd_t pmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 455 | unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV; |
| 456 | return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 459 | static inline int pte_none(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 461 | return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 464 | static inline int pte_present(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 466 | unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX; |
| 467 | return (pte_val(pte) & mask) == _PAGE_TYPE_NONE || |
| 468 | (!(pte_val(pte) & _PAGE_INVALID) && |
| 469 | !(pte_val(pte) & _PAGE_SWT)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | } |
| 471 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 472 | static inline int pte_file(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | { |
Martin Schwidefsky | 8337748 | 2006-10-18 18:30:51 +0200 | [diff] [blame] | 474 | unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT; |
| 475 | return (pte_val(pte) & mask) == _PAGE_TYPE_FILE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 478 | #define __HAVE_ARCH_PTE_SAME |
| 479 | #define pte_same(a,b) (pte_val(a) == pte_val(b)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | /* |
| 482 | * query functions pte_write/pte_dirty/pte_young only work if |
| 483 | * pte_present() is true. Undefined behaviour if not.. |
| 484 | */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 485 | static inline int pte_write(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | { |
| 487 | return (pte_val(pte) & _PAGE_RO) == 0; |
| 488 | } |
| 489 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 490 | static inline int pte_dirty(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
| 492 | /* A pte is neither clean nor dirty on s/390. The dirty bit |
| 493 | * is in the storage key. See page_test_and_clear_dirty for |
| 494 | * details. |
| 495 | */ |
| 496 | return 0; |
| 497 | } |
| 498 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 499 | static inline int pte_young(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | { |
| 501 | /* A pte is neither young nor old on s/390. The young bit |
| 502 | * is in the storage key. See page_test_and_clear_young for |
| 503 | * details. |
| 504 | */ |
| 505 | return 0; |
| 506 | } |
| 507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | /* |
| 509 | * pgd/pmd/pte modification functions |
| 510 | */ |
| 511 | |
| 512 | #ifndef __s390x__ |
| 513 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 514 | #define pgd_clear(pgd) do { } while (0) |
| 515 | #define pud_clear(pud) do { } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | #else /* __s390x__ */ |
| 518 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 519 | #define pgd_clear(pgd) do { } while (0) |
| 520 | |
| 521 | static inline void pud_clear_kernel(pud_t *pud) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | { |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 523 | pud_val(*pud) = _REGION3_ENTRY_EMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 526 | static inline void pud_clear(pud_t * pud) |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 527 | { |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 528 | pud_t *shadow = get_shadow_table(pud); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 529 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 530 | pud_clear_kernel(pud); |
| 531 | if (shadow) |
| 532 | pud_clear_kernel(shadow); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 533 | } |
| 534 | |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 535 | #endif /* __s390x__ */ |
| 536 | |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 537 | static inline void pmd_clear_kernel(pmd_t * pmdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | { |
Martin Schwidefsky | 3610cce | 2007-10-22 12:52:47 +0200 | [diff] [blame] | 539 | pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 542 | static inline void pmd_clear(pmd_t *pmd) |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 543 | { |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 544 | pmd_t *shadow = get_shadow_table(pmd); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 545 | |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 546 | pmd_clear_kernel(pmd); |
| 547 | if (shadow) |
| 548 | pmd_clear_kernel(shadow); |
Gerald Schaefer | c1821c2 | 2007-02-05 21:18:17 +0100 | [diff] [blame] | 549 | } |
| 550 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 551 | 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] | 552 | { |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 553 | pte_val(*ptep) = _PAGE_TYPE_EMPTY; |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 554 | if (mm->context.noexec) |
| 555 | pte_val(ptep[PTRS_PER_PTE]) = _PAGE_TYPE_EMPTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | /* |
| 559 | * The following pte modification functions only work if |
| 560 | * pte_present() is true. Undefined behaviour if not.. |
| 561 | */ |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 562 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
| 564 | pte_val(pte) &= PAGE_MASK; |
| 565 | pte_val(pte) |= pgprot_val(newprot); |
| 566 | return pte; |
| 567 | } |
| 568 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 569 | static inline pte_t pte_wrprotect(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | { |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 571 | /* Do not clobber _PAGE_TYPE_NONE pages! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | if (!(pte_val(pte) & _PAGE_INVALID)) |
| 573 | pte_val(pte) |= _PAGE_RO; |
| 574 | return pte; |
| 575 | } |
| 576 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 577 | static inline pte_t pte_mkwrite(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | { |
| 579 | pte_val(pte) &= ~_PAGE_RO; |
| 580 | return pte; |
| 581 | } |
| 582 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 583 | static inline pte_t pte_mkclean(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | { |
| 585 | /* The only user of pte_mkclean is the fork() code. |
| 586 | We must *not* clear the *physical* page dirty bit |
| 587 | just because fork() wants to clear the dirty bit in |
| 588 | *one* of the page's mappings. So we just do nothing. */ |
| 589 | return pte; |
| 590 | } |
| 591 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 592 | static inline pte_t pte_mkdirty(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
| 594 | /* We do not explicitly set the dirty bit because the |
| 595 | * sske instruction is slow. It is faster to let the |
| 596 | * next instruction set the dirty bit. |
| 597 | */ |
| 598 | return pte; |
| 599 | } |
| 600 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 601 | static inline pte_t pte_mkold(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | { |
| 603 | /* S/390 doesn't keep its dirty/referenced bit in the pte. |
| 604 | * There is no point in clearing the real referenced bit. |
| 605 | */ |
| 606 | return pte; |
| 607 | } |
| 608 | |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 609 | static inline pte_t pte_mkyoung(pte_t pte) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | { |
| 611 | /* S/390 doesn't keep its dirty/referenced bit in the pte. |
| 612 | * There is no point in setting the real referenced bit. |
| 613 | */ |
| 614 | return pte; |
| 615 | } |
| 616 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 617 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
| 618 | static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, |
| 619 | unsigned long addr, pte_t *ptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | { |
| 621 | return 0; |
| 622 | } |
| 623 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 624 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
| 625 | static inline int ptep_clear_flush_young(struct vm_area_struct *vma, |
| 626 | unsigned long address, pte_t *ptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
| 628 | /* No need to flush TLB; bits are in storage key */ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 629 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | } |
| 631 | |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 632 | static inline void __ptep_ipte(unsigned long address, pte_t *ptep) |
| 633 | { |
| 634 | if (!(pte_val(*ptep) & _PAGE_INVALID)) { |
| 635 | #ifndef __s390x__ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 636 | /* pto must point to the start of the segment table */ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 637 | pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00); |
| 638 | #else |
| 639 | /* ipte in zarch mode can do the math */ |
| 640 | pte_t *pto = ptep; |
| 641 | #endif |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 642 | asm volatile( |
| 643 | " ipte %2,%3" |
| 644 | : "=m" (*ptep) : "m" (*ptep), |
| 645 | "a" (pto), "a" (address)); |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 646 | } |
| 647 | pte_val(*ptep) = _PAGE_TYPE_EMPTY; |
| 648 | } |
| 649 | |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 650 | static inline void ptep_invalidate(struct mm_struct *mm, |
| 651 | unsigned long address, pte_t *ptep) |
Martin Schwidefsky | f0e47c2 | 2007-07-17 04:03:03 -0700 | [diff] [blame] | 652 | { |
| 653 | __ptep_ipte(address, ptep); |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 654 | if (mm->context.noexec) |
| 655 | __ptep_ipte(address, ptep + PTRS_PER_PTE); |
Martin Schwidefsky | f0e47c2 | 2007-07-17 04:03:03 -0700 | [diff] [blame] | 656 | } |
| 657 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 658 | /* |
| 659 | * This is hard to understand. ptep_get_and_clear and ptep_clear_flush |
| 660 | * both clear the TLB for the unmapped pte. The reason is that |
| 661 | * ptep_get_and_clear is used in common code (e.g. change_pte_range) |
| 662 | * to modify an active pte. The sequence is |
| 663 | * 1) ptep_get_and_clear |
| 664 | * 2) set_pte_at |
| 665 | * 3) flush_tlb_range |
| 666 | * On s390 the tlb needs to get flushed with the modification of the pte |
| 667 | * if the pte is active. The only way how this can be implemented is to |
| 668 | * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range |
| 669 | * is a nop. |
| 670 | */ |
| 671 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| 672 | #define ptep_get_and_clear(__mm, __address, __ptep) \ |
| 673 | ({ \ |
| 674 | pte_t __pte = *(__ptep); \ |
| 675 | if (atomic_read(&(__mm)->mm_users) > 1 || \ |
| 676 | (__mm) != current->active_mm) \ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 677 | ptep_invalidate(__mm, __address, __ptep); \ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 678 | else \ |
| 679 | pte_clear((__mm), (__address), (__ptep)); \ |
| 680 | __pte; \ |
| 681 | }) |
| 682 | |
| 683 | #define __HAVE_ARCH_PTEP_CLEAR_FLUSH |
Martin Schwidefsky | f0e47c2 | 2007-07-17 04:03:03 -0700 | [diff] [blame] | 684 | static inline pte_t ptep_clear_flush(struct vm_area_struct *vma, |
| 685 | unsigned long address, pte_t *ptep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | { |
| 687 | pte_t pte = *ptep; |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 688 | ptep_invalidate(vma->vm_mm, address, ptep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | return pte; |
| 690 | } |
| 691 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 692 | /* |
| 693 | * The batched pte unmap code uses ptep_get_and_clear_full to clear the |
| 694 | * ptes. Here an optimization is possible. tlb_gather_mmu flushes all |
| 695 | * tlbs of an mm if it can guarantee that the ptes of the mm_struct |
| 696 | * cannot be accessed while the batched unmap is running. In this case |
| 697 | * full==1 and a simple pte_clear is enough. See tlb.h. |
| 698 | */ |
| 699 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL |
| 700 | static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, |
| 701 | unsigned long addr, |
| 702 | pte_t *ptep, int full) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 704 | pte_t pte = *ptep; |
| 705 | |
| 706 | if (full) |
| 707 | pte_clear(mm, addr, ptep); |
| 708 | else |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 709 | ptep_invalidate(mm, addr, ptep); |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 710 | return pte; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | } |
| 712 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 713 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| 714 | #define ptep_set_wrprotect(__mm, __addr, __ptep) \ |
| 715 | ({ \ |
| 716 | pte_t __pte = *(__ptep); \ |
| 717 | if (pte_write(__pte)) { \ |
| 718 | if (atomic_read(&(__mm)->mm_users) > 1 || \ |
| 719 | (__mm) != current->active_mm) \ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 720 | ptep_invalidate(__mm, __addr, __ptep); \ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 721 | set_pte_at(__mm, __addr, __ptep, pte_wrprotect(__pte)); \ |
| 722 | } \ |
| 723 | }) |
| 724 | |
| 725 | #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS |
Martin Schwidefsky | f0e47c2 | 2007-07-17 04:03:03 -0700 | [diff] [blame] | 726 | #define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \ |
| 727 | ({ \ |
| 728 | int __changed = !pte_same(*(__ptep), __entry); \ |
| 729 | if (__changed) { \ |
Martin Schwidefsky | 146e4b3 | 2008-02-09 18:24:35 +0100 | [diff] [blame^] | 730 | ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \ |
Martin Schwidefsky | f0e47c2 | 2007-07-17 04:03:03 -0700 | [diff] [blame] | 731 | set_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \ |
| 732 | } \ |
| 733 | __changed; \ |
Benjamin Herrenschmidt | 8dab524 | 2007-06-16 10:16:12 -0700 | [diff] [blame] | 734 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /* |
| 737 | * Test and clear dirty bit in storage key. |
| 738 | * We can't clear the changed bit atomically. This is a potential |
| 739 | * race against modification of the referenced bit. This function |
| 740 | * should therefore only be called if it is not mapped in any |
| 741 | * address space. |
| 742 | */ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 743 | #define __HAVE_ARCH_PAGE_TEST_DIRTY |
Martin Schwidefsky | 6c21048 | 2007-04-27 16:01:57 +0200 | [diff] [blame] | 744 | static inline int page_test_dirty(struct page *page) |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 745 | { |
Martin Schwidefsky | 6c21048 | 2007-04-27 16:01:57 +0200 | [diff] [blame] | 746 | return (page_get_storage_key(page_to_phys(page)) & _PAGE_CHANGED) != 0; |
| 747 | } |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 748 | |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 749 | #define __HAVE_ARCH_PAGE_CLEAR_DIRTY |
Martin Schwidefsky | 6c21048 | 2007-04-27 16:01:57 +0200 | [diff] [blame] | 750 | static inline void page_clear_dirty(struct page *page) |
| 751 | { |
| 752 | page_set_storage_key(page_to_phys(page), PAGE_DEFAULT_KEY); |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 753 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | /* |
| 756 | * Test and clear referenced bit in storage key. |
| 757 | */ |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 758 | #define __HAVE_ARCH_PAGE_TEST_AND_CLEAR_YOUNG |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 759 | static inline int page_test_and_clear_young(struct page *page) |
| 760 | { |
Heiko Carstens | 0b2b6e1d | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 761 | unsigned long physpage = page_to_phys(page); |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 762 | int ccode; |
| 763 | |
Heiko Carstens | 0b2b6e1d | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 764 | asm volatile( |
| 765 | " rrbe 0,%1\n" |
| 766 | " ipm %0\n" |
| 767 | " srl %0,28\n" |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 768 | : "=d" (ccode) : "a" (physpage) : "cc" ); |
| 769 | return ccode & 2; |
| 770 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
| 772 | /* |
| 773 | * Conversion functions: convert a page and protection to a page entry, |
| 774 | * and a page entry and page directory to the page they refer to. |
| 775 | */ |
| 776 | static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) |
| 777 | { |
| 778 | pte_t __pte; |
| 779 | pte_val(__pte) = physpage + pgprot_val(pgprot); |
| 780 | return __pte; |
| 781 | } |
| 782 | |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 783 | static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) |
| 784 | { |
Heiko Carstens | 0b2b6e1d | 2006-10-04 20:02:23 +0200 | [diff] [blame] | 785 | unsigned long physpage = page_to_phys(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
Heiko Carstens | 2dcea57 | 2006-09-29 01:58:41 -0700 | [diff] [blame] | 787 | return mk_pte_phys(physpage, pgprot); |
| 788 | } |
| 789 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1)) |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 791 | #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) |
| 792 | #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) |
| 793 | #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 795 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| 797 | |
| 798 | #ifndef __s390x__ |
| 799 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 800 | #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) |
| 801 | #define pud_deref(pmd) ({ BUG(); 0UL; }) |
| 802 | #define pgd_deref(pmd) ({ BUG(); 0UL; }) |
| 803 | |
| 804 | #define pud_offset(pgd, address) ((pud_t *) pgd) |
| 805 | #define pmd_offset(pud, address) ((pmd_t *) pud + pmd_index(address)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
| 807 | #else /* __s390x__ */ |
| 808 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 809 | #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) |
| 810 | #define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN) |
| 811 | #define pgd_deref(pgd) ({ BUG(); 0UL; }) |
| 812 | |
| 813 | #define pud_offset(pgd, address) ((pud_t *) pgd) |
| 814 | |
| 815 | static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) |
| 816 | { |
| 817 | pmd_t *pmd = (pmd_t *) pud_deref(*pud); |
| 818 | return pmd + pmd_index(address); |
| 819 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | #endif /* __s390x__ */ |
| 822 | |
Martin Schwidefsky | 190a1d7 | 2007-10-22 12:52:48 +0200 | [diff] [blame] | 823 | #define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot)) |
| 824 | #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) |
| 825 | #define pte_page(x) pfn_to_page(pte_pfn(x)) |
| 826 | |
| 827 | #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT) |
| 828 | |
| 829 | /* Find an entry in the lowest level page table.. */ |
| 830 | #define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr)) |
| 831 | #define pte_offset_kernel(pmd, address) pte_offset(pmd,address) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address) |
| 833 | #define pte_offset_map_nested(pmd, address) pte_offset_kernel(pmd, address) |
| 834 | #define pte_unmap(pte) do { } while (0) |
| 835 | #define pte_unmap_nested(pte) do { } while (0) |
| 836 | |
| 837 | /* |
| 838 | * 31 bit swap entry format: |
| 839 | * A page-table entry has some bits we have to treat in a special way. |
| 840 | * Bits 0, 20 and bit 23 have to be zero, otherwise an specification |
| 841 | * exception will occur instead of a page translation exception. The |
| 842 | * specifiation exception has the bad habit not to store necessary |
| 843 | * information in the lowcore. |
| 844 | * Bit 21 and bit 22 are the page invalid bit and the page protection |
| 845 | * bit. We set both to indicate a swapped page. |
| 846 | * Bit 30 and 31 are used to distinguish the different page types. For |
| 847 | * a swapped page these bits need to be zero. |
| 848 | * This leaves the bits 1-19 and bits 24-29 to store type and offset. |
| 849 | * We use the 5 bits from 25-29 for the type and the 20 bits from 1-19 |
| 850 | * plus 24 for the offset. |
| 851 | * 0| offset |0110|o|type |00| |
| 852 | * 0 0000000001111111111 2222 2 22222 33 |
| 853 | * 0 1234567890123456789 0123 4 56789 01 |
| 854 | * |
| 855 | * 64 bit swap entry format: |
| 856 | * A page-table entry has some bits we have to treat in a special way. |
| 857 | * Bits 52 and bit 55 have to be zero, otherwise an specification |
| 858 | * exception will occur instead of a page translation exception. The |
| 859 | * specifiation exception has the bad habit not to store necessary |
| 860 | * information in the lowcore. |
| 861 | * Bit 53 and bit 54 are the page invalid bit and the page protection |
| 862 | * bit. We set both to indicate a swapped page. |
| 863 | * Bit 62 and 63 are used to distinguish the different page types. For |
| 864 | * a swapped page these bits need to be zero. |
| 865 | * This leaves the bits 0-51 and bits 56-61 to store type and offset. |
| 866 | * We use the 5 bits from 57-61 for the type and the 53 bits from 0-51 |
| 867 | * plus 56 for the offset. |
| 868 | * | offset |0110|o|type |00| |
| 869 | * 0000000000111111111122222222223333333333444444444455 5555 5 55566 66 |
| 870 | * 0123456789012345678901234567890123456789012345678901 2345 6 78901 23 |
| 871 | */ |
| 872 | #ifndef __s390x__ |
| 873 | #define __SWP_OFFSET_MASK (~0UL >> 12) |
| 874 | #else |
| 875 | #define __SWP_OFFSET_MASK (~0UL >> 11) |
| 876 | #endif |
Adrian Bunk | 4448aaf | 2005-11-08 21:34:42 -0800 | [diff] [blame] | 877 | 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] | 878 | { |
| 879 | pte_t pte; |
| 880 | offset &= __SWP_OFFSET_MASK; |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 881 | pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | ((offset & 1UL) << 7) | ((offset & ~1UL) << 11); |
| 883 | return pte; |
| 884 | } |
| 885 | |
| 886 | #define __swp_type(entry) (((entry).val >> 2) & 0x1f) |
| 887 | #define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1)) |
| 888 | #define __swp_entry(type,offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) }) |
| 889 | |
| 890 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) |
| 891 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |
| 892 | |
| 893 | #ifndef __s390x__ |
| 894 | # define PTE_FILE_MAX_BITS 26 |
| 895 | #else /* __s390x__ */ |
| 896 | # define PTE_FILE_MAX_BITS 59 |
| 897 | #endif /* __s390x__ */ |
| 898 | |
| 899 | #define pte_to_pgoff(__pte) \ |
| 900 | ((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f)) |
| 901 | |
| 902 | #define pgoff_to_pte(__off) \ |
| 903 | ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \ |
Gerald Schaefer | 9282ed9 | 2006-09-20 15:59:37 +0200 | [diff] [blame] | 904 | | _PAGE_TYPE_FILE }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | #endif /* !__ASSEMBLY__ */ |
| 907 | |
| 908 | #define kern_addr_valid(addr) (1) |
| 909 | |
Heiko Carstens | f4eb07c | 2006-12-08 15:56:07 +0100 | [diff] [blame] | 910 | extern int add_shared_memory(unsigned long start, unsigned long size); |
| 911 | extern int remove_shared_memory(unsigned long start, unsigned long size); |
| 912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | /* |
| 914 | * No page table caches to initialise |
| 915 | */ |
| 916 | #define pgtable_cache_init() do { } while (0) |
| 917 | |
Heiko Carstens | f4eb07c | 2006-12-08 15:56:07 +0100 | [diff] [blame] | 918 | #define __HAVE_ARCH_MEMMAP_INIT |
| 919 | extern void memmap_init(unsigned long, int, unsigned long, unsigned long); |
| 920 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | #include <asm-generic/pgtable.h> |
| 922 | |
| 923 | #endif /* _S390_PAGE_H */ |