3 * Copyright IBM Corp. 1999, 2000
8 * Derived from "include/asm-i386/pgtable.h"
11 #ifndef _ASM_S390_PGTABLE_H
12 #define _ASM_S390_PGTABLE_H
15 * The Linux memory management assumes a three-level page table setup.
16 * For s390 64 bit we use up to four of the five levels the hardware
17 * provides (region first tables are not used).
19 * The "pgd_xxx()" functions are trivial for a folded two-level
20 * setup: the pgd is never bad, and a pmd always exists (as it's folded
23 * This file contains the functions and defines necessary to modify and use
24 * the S390 page table tree.
27 #include <linux/sched.h>
28 #include <linux/mm_types.h>
29 #include <linux/page-flags.h>
30 #include <linux/radix-tree.h>
34 extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096)));
35 extern void paging_init(void);
36 extern void vmem_map_init(void);
39 * The S390 doesn't have any external MMU info: the kernel page
40 * tables contain all the necessary information.
42 #define update_mmu_cache(vma, address, ptep) do { } while (0)
43 #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)
46 * ZERO_PAGE is a global shared page that is always zero; used
47 * for zero-mapped memory areas etc..
50 extern unsigned long empty_zero_page;
51 extern unsigned long zero_page_mask;
53 #define ZERO_PAGE(vaddr) \
54 (virt_to_page((void *)(empty_zero_page + \
55 (((unsigned long)(vaddr)) &zero_page_mask))))
56 #define __HAVE_COLOR_ZERO_PAGE
58 /* TODO: s390 cannot support io_remap_pfn_range... */
59 #endif /* !__ASSEMBLY__ */
62 * PMD_SHIFT determines the size of the area a second-level page
64 * PGDIR_SHIFT determines what a third-level page table entry can map
68 #define PGDIR_SHIFT 42
70 #define PMD_SIZE (1UL << PMD_SHIFT)
71 #define PMD_MASK (~(PMD_SIZE-1))
72 #define PUD_SIZE (1UL << PUD_SHIFT)
73 #define PUD_MASK (~(PUD_SIZE-1))
74 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
75 #define PGDIR_MASK (~(PGDIR_SIZE-1))
78 * entries per page directory level: the S390 is two-level, so
79 * we don't really have any PMD directory physically.
80 * for S390 segment-table entries are combined to one PGD
81 * that leads to 1024 pte per pgd
83 #define PTRS_PER_PTE 256
84 #define PTRS_PER_PMD 2048
85 #define PTRS_PER_PUD 2048
86 #define PTRS_PER_PGD 2048
88 #define FIRST_USER_ADDRESS 0UL
90 #define pte_ERROR(e) \
91 printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e))
92 #define pmd_ERROR(e) \
93 printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e))
94 #define pud_ERROR(e) \
95 printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e))
96 #define pgd_ERROR(e) \
97 printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e))
101 * The vmalloc and module area will always be on the topmost area of the
102 * kernel mapping. We reserve 128GB (64bit) for vmalloc and modules.
103 * On 64 bit kernels we have a 2GB area at the top of the vmalloc area where
104 * modules will reside. That makes sure that inter module branches always
105 * happen without trampolines and in addition the placement within a 2GB frame
106 * is branch prediction unit friendly.
108 extern unsigned long VMALLOC_START;
109 extern unsigned long VMALLOC_END;
110 extern struct page *vmemmap;
112 #define VMEM_MAX_PHYS ((unsigned long) vmemmap)
114 extern unsigned long MODULES_VADDR;
115 extern unsigned long MODULES_END;
116 #define MODULES_VADDR MODULES_VADDR
117 #define MODULES_END MODULES_END
118 #define MODULES_LEN (1UL << 31)
120 static inline int is_module_addr(void *addr)
122 BUILD_BUG_ON(MODULES_LEN > (1UL << 31));
123 if (addr < (void *)MODULES_VADDR)
125 if (addr > (void *)MODULES_END)
131 * A 64 bit pagetable entry of S390 has following format:
133 * 0000000000111111111122222222223333333333444444444455555555556666
134 * 0123456789012345678901234567890123456789012345678901234567890123
136 * I Page-Invalid Bit: Page is not available for address-translation
137 * P Page-Protection Bit: Store access not possible for page
138 * C Change-bit override: HW is not required to set change bit
140 * A 64 bit segmenttable entry of S390 has following format:
141 * | P-table origin | TT
142 * 0000000000111111111122222222223333333333444444444455555555556666
143 * 0123456789012345678901234567890123456789012345678901234567890123
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 * P Page-Protection Bit: Store access not possible for page
150 * A 64 bit region table entry of S390 has following format:
151 * | S-table origin | TF TTTL
152 * 0000000000111111111122222222223333333333444444444455555555556666
153 * 0123456789012345678901234567890123456789012345678901234567890123
155 * I Segment-Invalid Bit: Segment is not available for address-translation
160 * The 64 bit regiontable origin of S390 has following format:
161 * | region table origon | DTTL
162 * 0000000000111111111122222222223333333333444444444455555555556666
163 * 0123456789012345678901234567890123456789012345678901234567890123
165 * X Space-Switch event:
166 * G Segment-Invalid Bit:
167 * P Private-Space Bit:
168 * S Storage-Alteration:
172 * A storage key has the following format:
176 * F : fetch protection bit
181 /* Hardware bits in the page table entry */
182 #define _PAGE_PROTECT 0x200 /* HW read-only bit */
183 #define _PAGE_INVALID 0x400 /* HW invalid bit */
184 #define _PAGE_LARGE 0x800 /* Bit to mark a large pte */
186 /* Software bits in the page table entry */
187 #define _PAGE_PRESENT 0x001 /* SW pte present bit */
188 #define _PAGE_YOUNG 0x004 /* SW pte young bit */
189 #define _PAGE_DIRTY 0x008 /* SW pte dirty bit */
190 #define _PAGE_READ 0x010 /* SW pte read bit */
191 #define _PAGE_WRITE 0x020 /* SW pte write bit */
192 #define _PAGE_SPECIAL 0x040 /* SW associated with special page */
193 #define _PAGE_UNUSED 0x080 /* SW bit for pgste usage state */
194 #define __HAVE_ARCH_PTE_SPECIAL
196 #ifdef CONFIG_MEM_SOFT_DIRTY
197 #define _PAGE_SOFT_DIRTY 0x002 /* SW pte soft dirty bit */
199 #define _PAGE_SOFT_DIRTY 0x000
202 /* Set of bits not changed in pte_modify */
203 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
204 _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
207 * handle_pte_fault uses pte_present and pte_none to find out the pte type
208 * WITHOUT holding the page table lock. The _PAGE_PRESENT bit is used to
209 * distinguish present from not-present ptes. It is changed only with the page
212 * The following table gives the different possible bit combinations for
213 * the pte hardware and software bits in the last 12 bits of a pte
214 * (. unassigned bit, x don't care, t swap type):
222 * prot-none, clean, old .11.xx0000.1
223 * prot-none, clean, young .11.xx0001.1
224 * prot-none, dirty, old .10.xx0010.1
225 * prot-none, dirty, young .10.xx0011.1
226 * read-only, clean, old .11.xx0100.1
227 * read-only, clean, young .01.xx0101.1
228 * read-only, dirty, old .11.xx0110.1
229 * read-only, dirty, young .01.xx0111.1
230 * read-write, clean, old .11.xx1100.1
231 * read-write, clean, young .01.xx1101.1
232 * read-write, dirty, old .10.xx1110.1
233 * read-write, dirty, young .00.xx1111.1
234 * HW-bits: R read-only, I invalid
235 * SW-bits: p present, y young, d dirty, r read, w write, s special,
238 * pte_none is true for the bit pattern .10.00000000, pte == 0x400
239 * pte_swap is true for the bit pattern .11..ooooo.0, (pte & 0x201) == 0x200
240 * pte_present is true for the bit pattern .xx.xxxxxx.1, (pte & 0x001) == 0x001
243 /* Bits in the segment/region table address-space-control-element */
244 #define _ASCE_ORIGIN ~0xfffUL/* segment table origin */
245 #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
246 #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
247 #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */
248 #define _ASCE_REAL_SPACE 0x20 /* real space control */
249 #define _ASCE_TYPE_MASK 0x0c /* asce table type mask */
250 #define _ASCE_TYPE_REGION1 0x0c /* region first table type */
251 #define _ASCE_TYPE_REGION2 0x08 /* region second table type */
252 #define _ASCE_TYPE_REGION3 0x04 /* region third table type */
253 #define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */
254 #define _ASCE_TABLE_LENGTH 0x03 /* region table length */
256 /* Bits in the region table entry */
257 #define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */
258 #define _REGION_ENTRY_PROTECT 0x200 /* region protection bit */
259 #define _REGION_ENTRY_OFFSET 0xc0 /* region table offset */
260 #define _REGION_ENTRY_INVALID 0x20 /* invalid region table entry */
261 #define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */
262 #define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */
263 #define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */
264 #define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */
265 #define _REGION_ENTRY_LENGTH 0x03 /* region third length */
267 #define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH)
268 #define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID)
269 #define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
270 #define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID)
271 #define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
272 #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID)
274 #define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */
275 #define _REGION3_ENTRY_RO 0x200 /* page protection bit */
277 /* Bits in the segment table entry */
278 #define _SEGMENT_ENTRY_BITS 0xfffffffffffffe33UL
279 #define _SEGMENT_ENTRY_BITS_LARGE 0xfffffffffff0ff33UL
280 #define _SEGMENT_ENTRY_ORIGIN_LARGE ~0xfffffUL /* large page address */
281 #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
282 #define _SEGMENT_ENTRY_PROTECT 0x200 /* page protection bit */
283 #define _SEGMENT_ENTRY_INVALID 0x20 /* invalid segment table entry */
285 #define _SEGMENT_ENTRY (0)
286 #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INVALID)
288 #define _SEGMENT_ENTRY_DIRTY 0x2000 /* SW segment dirty bit */
289 #define _SEGMENT_ENTRY_YOUNG 0x1000 /* SW segment young bit */
290 #define _SEGMENT_ENTRY_LARGE 0x0400 /* STE-format control, large page */
291 #define _SEGMENT_ENTRY_READ 0x0002 /* SW segment read bit */
292 #define _SEGMENT_ENTRY_WRITE 0x0001 /* SW segment write bit */
294 #ifdef CONFIG_MEM_SOFT_DIRTY
295 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x4000 /* SW segment soft dirty bit */
297 #define _SEGMENT_ENTRY_SOFT_DIRTY 0x0000 /* SW segment soft dirty bit */
301 * Segment table entry encoding (R = read-only, I = invalid, y = young bit):
303 * prot-none, clean, old 00..1...1...00
304 * prot-none, clean, young 01..1...1...00
305 * prot-none, dirty, old 10..1...1...00
306 * prot-none, dirty, young 11..1...1...00
307 * read-only, clean, old 00..1...1...10
308 * read-only, clean, young 01..1...0...10
309 * read-only, dirty, old 10..1...1...10
310 * read-only, dirty, young 11..1...0...10
311 * read-write, clean, old 00..1...1...11
312 * read-write, clean, young 01..1...0...11
313 * read-write, dirty, old 10..0...1...11
314 * read-write, dirty, young 11..0...0...11
315 * The segment table origin is used to distinguish empty (origin==0) from
316 * read-write, old segment table entries (origin!=0)
317 * HW-bits: R read-only, I invalid
318 * SW-bits: y young, d dirty, r read, w write
321 /* Page status table bits for virtualization */
322 #define PGSTE_ACC_BITS 0xf000000000000000UL
323 #define PGSTE_FP_BIT 0x0800000000000000UL
324 #define PGSTE_PCL_BIT 0x0080000000000000UL
325 #define PGSTE_HR_BIT 0x0040000000000000UL
326 #define PGSTE_HC_BIT 0x0020000000000000UL
327 #define PGSTE_GR_BIT 0x0004000000000000UL
328 #define PGSTE_GC_BIT 0x0002000000000000UL
329 #define PGSTE_UC_BIT 0x0000800000000000UL /* user dirty (migration) */
330 #define PGSTE_IN_BIT 0x0000400000000000UL /* IPTE notify bit */
331 #define PGSTE_VSIE_BIT 0x0000200000000000UL /* ref'd in a shadow table */
333 /* Guest Page State used for virtualization */
334 #define _PGSTE_GPS_ZERO 0x0000000080000000UL
335 #define _PGSTE_GPS_USAGE_MASK 0x0000000003000000UL
336 #define _PGSTE_GPS_USAGE_STABLE 0x0000000000000000UL
337 #define _PGSTE_GPS_USAGE_UNUSED 0x0000000001000000UL
340 * A user page table pointer has the space-switch-event bit, the
341 * private-space-control bit and the storage-alteration-event-control
342 * bit set. A kernel page table pointer doesn't need them.
344 #define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \
348 * Page protection definitions.
350 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_INVALID)
351 #define PAGE_READ __pgprot(_PAGE_PRESENT | _PAGE_READ | \
352 _PAGE_INVALID | _PAGE_PROTECT)
353 #define PAGE_WRITE __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
354 _PAGE_INVALID | _PAGE_PROTECT)
356 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
357 _PAGE_YOUNG | _PAGE_DIRTY)
358 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
359 _PAGE_YOUNG | _PAGE_DIRTY)
360 #define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_YOUNG | \
364 * On s390 the page table entry has an invalid bit and a read-only bit.
365 * Read permission implies execute permission and write permission
366 * implies read permission.
369 #define __P000 PAGE_NONE
370 #define __P001 PAGE_READ
371 #define __P010 PAGE_READ
372 #define __P011 PAGE_READ
373 #define __P100 PAGE_READ
374 #define __P101 PAGE_READ
375 #define __P110 PAGE_READ
376 #define __P111 PAGE_READ
378 #define __S000 PAGE_NONE
379 #define __S001 PAGE_READ
380 #define __S010 PAGE_WRITE
381 #define __S011 PAGE_WRITE
382 #define __S100 PAGE_READ
383 #define __S101 PAGE_READ
384 #define __S110 PAGE_WRITE
385 #define __S111 PAGE_WRITE
388 * Segment entry (large page) protection definitions.
390 #define SEGMENT_NONE __pgprot(_SEGMENT_ENTRY_INVALID | \
391 _SEGMENT_ENTRY_PROTECT)
392 #define SEGMENT_READ __pgprot(_SEGMENT_ENTRY_PROTECT | \
394 #define SEGMENT_WRITE __pgprot(_SEGMENT_ENTRY_READ | \
395 _SEGMENT_ENTRY_WRITE)
397 static inline int mm_has_pgste(struct mm_struct *mm)
400 if (unlikely(mm->context.has_pgste))
406 static inline int mm_alloc_pgste(struct mm_struct *mm)
409 if (unlikely(mm->context.alloc_pgste))
416 * In the case that a guest uses storage keys
417 * faults should no longer be backed by zero pages
419 #define mm_forbids_zeropage mm_use_skey
420 static inline int mm_use_skey(struct mm_struct *mm)
423 if (mm->context.use_skey)
430 * pgd/pmd/pte query functions
432 static inline int pgd_present(pgd_t pgd)
434 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
436 return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
439 static inline int pgd_none(pgd_t pgd)
441 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
443 return (pgd_val(pgd) & _REGION_ENTRY_INVALID) != 0UL;
446 static inline int pgd_bad(pgd_t pgd)
449 * With dynamic page table levels the pgd can be a region table
450 * entry or a segment table entry. Check for the bit that are
451 * invalid for either table entry.
454 ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INVALID &
455 ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
456 return (pgd_val(pgd) & mask) != 0;
459 static inline int pud_present(pud_t pud)
461 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
463 return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
466 static inline int pud_none(pud_t pud)
468 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
470 return (pud_val(pud) & _REGION_ENTRY_INVALID) != 0UL;
473 static inline int pud_large(pud_t pud)
475 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) != _REGION_ENTRY_TYPE_R3)
477 return !!(pud_val(pud) & _REGION3_ENTRY_LARGE);
480 static inline int pud_bad(pud_t pud)
483 * With dynamic page table levels the pud can be a region table
484 * entry or a segment table entry. Check for the bit that are
485 * invalid for either table entry.
488 ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INVALID &
489 ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
490 return (pud_val(pud) & mask) != 0;
493 static inline int pmd_present(pmd_t pmd)
495 return pmd_val(pmd) != _SEGMENT_ENTRY_INVALID;
498 static inline int pmd_none(pmd_t pmd)
500 return pmd_val(pmd) == _SEGMENT_ENTRY_INVALID;
503 static inline int pmd_large(pmd_t pmd)
505 return (pmd_val(pmd) & _SEGMENT_ENTRY_LARGE) != 0;
508 static inline unsigned long pmd_pfn(pmd_t pmd)
510 unsigned long origin_mask;
512 origin_mask = _SEGMENT_ENTRY_ORIGIN;
514 origin_mask = _SEGMENT_ENTRY_ORIGIN_LARGE;
515 return (pmd_val(pmd) & origin_mask) >> PAGE_SHIFT;
518 static inline int pmd_bad(pmd_t pmd)
521 return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS_LARGE) != 0;
522 return (pmd_val(pmd) & ~_SEGMENT_ENTRY_BITS) != 0;
525 #define __HAVE_ARCH_PMD_WRITE
526 static inline int pmd_write(pmd_t pmd)
528 return (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE) != 0;
531 static inline int pmd_dirty(pmd_t pmd)
535 dirty = (pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY) != 0;
539 static inline int pmd_young(pmd_t pmd)
543 young = (pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG) != 0;
547 static inline int pte_present(pte_t pte)
549 /* Bit pattern: (pte & 0x001) == 0x001 */
550 return (pte_val(pte) & _PAGE_PRESENT) != 0;
553 static inline int pte_none(pte_t pte)
555 /* Bit pattern: pte == 0x400 */
556 return pte_val(pte) == _PAGE_INVALID;
559 static inline int pte_swap(pte_t pte)
561 /* Bit pattern: (pte & 0x201) == 0x200 */
562 return (pte_val(pte) & (_PAGE_PROTECT | _PAGE_PRESENT))
566 static inline int pte_special(pte_t pte)
568 return (pte_val(pte) & _PAGE_SPECIAL);
571 #define __HAVE_ARCH_PTE_SAME
572 static inline int pte_same(pte_t a, pte_t b)
574 return pte_val(a) == pte_val(b);
577 #ifdef CONFIG_NUMA_BALANCING
578 static inline int pte_protnone(pte_t pte)
580 return pte_present(pte) && !(pte_val(pte) & _PAGE_READ);
583 static inline int pmd_protnone(pmd_t pmd)
585 /* pmd_large(pmd) implies pmd_present(pmd) */
586 return pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_READ);
590 static inline int pte_soft_dirty(pte_t pte)
592 return pte_val(pte) & _PAGE_SOFT_DIRTY;
594 #define pte_swp_soft_dirty pte_soft_dirty
596 static inline pte_t pte_mksoft_dirty(pte_t pte)
598 pte_val(pte) |= _PAGE_SOFT_DIRTY;
601 #define pte_swp_mksoft_dirty pte_mksoft_dirty
603 static inline pte_t pte_clear_soft_dirty(pte_t pte)
605 pte_val(pte) &= ~_PAGE_SOFT_DIRTY;
608 #define pte_swp_clear_soft_dirty pte_clear_soft_dirty
610 static inline int pmd_soft_dirty(pmd_t pmd)
612 return pmd_val(pmd) & _SEGMENT_ENTRY_SOFT_DIRTY;
615 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
617 pmd_val(pmd) |= _SEGMENT_ENTRY_SOFT_DIRTY;
621 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
623 pmd_val(pmd) &= ~_SEGMENT_ENTRY_SOFT_DIRTY;
628 * query functions pte_write/pte_dirty/pte_young only work if
629 * pte_present() is true. Undefined behaviour if not..
631 static inline int pte_write(pte_t pte)
633 return (pte_val(pte) & _PAGE_WRITE) != 0;
636 static inline int pte_dirty(pte_t pte)
638 return (pte_val(pte) & _PAGE_DIRTY) != 0;
641 static inline int pte_young(pte_t pte)
643 return (pte_val(pte) & _PAGE_YOUNG) != 0;
646 #define __HAVE_ARCH_PTE_UNUSED
647 static inline int pte_unused(pte_t pte)
649 return pte_val(pte) & _PAGE_UNUSED;
653 * pgd/pmd/pte modification functions
656 static inline void pgd_clear(pgd_t *pgd)
658 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
659 pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
662 static inline void pud_clear(pud_t *pud)
664 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
665 pud_val(*pud) = _REGION3_ENTRY_EMPTY;
668 static inline void pmd_clear(pmd_t *pmdp)
670 pmd_val(*pmdp) = _SEGMENT_ENTRY_INVALID;
673 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
675 pte_val(*ptep) = _PAGE_INVALID;
679 * The following pte modification functions only work if
680 * pte_present() is true. Undefined behaviour if not..
682 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
684 pte_val(pte) &= _PAGE_CHG_MASK;
685 pte_val(pte) |= pgprot_val(newprot);
687 * newprot for PAGE_NONE, PAGE_READ and PAGE_WRITE has the
688 * invalid bit set, clear it again for readable, young pages
690 if ((pte_val(pte) & _PAGE_YOUNG) && (pte_val(pte) & _PAGE_READ))
691 pte_val(pte) &= ~_PAGE_INVALID;
693 * newprot for PAGE_READ and PAGE_WRITE has the page protection
694 * bit set, clear it again for writable, dirty pages
696 if ((pte_val(pte) & _PAGE_DIRTY) && (pte_val(pte) & _PAGE_WRITE))
697 pte_val(pte) &= ~_PAGE_PROTECT;
701 static inline pte_t pte_wrprotect(pte_t pte)
703 pte_val(pte) &= ~_PAGE_WRITE;
704 pte_val(pte) |= _PAGE_PROTECT;
708 static inline pte_t pte_mkwrite(pte_t pte)
710 pte_val(pte) |= _PAGE_WRITE;
711 if (pte_val(pte) & _PAGE_DIRTY)
712 pte_val(pte) &= ~_PAGE_PROTECT;
716 static inline pte_t pte_mkclean(pte_t pte)
718 pte_val(pte) &= ~_PAGE_DIRTY;
719 pte_val(pte) |= _PAGE_PROTECT;
723 static inline pte_t pte_mkdirty(pte_t pte)
725 pte_val(pte) |= _PAGE_DIRTY | _PAGE_SOFT_DIRTY;
726 if (pte_val(pte) & _PAGE_WRITE)
727 pte_val(pte) &= ~_PAGE_PROTECT;
731 static inline pte_t pte_mkold(pte_t pte)
733 pte_val(pte) &= ~_PAGE_YOUNG;
734 pte_val(pte) |= _PAGE_INVALID;
738 static inline pte_t pte_mkyoung(pte_t pte)
740 pte_val(pte) |= _PAGE_YOUNG;
741 if (pte_val(pte) & _PAGE_READ)
742 pte_val(pte) &= ~_PAGE_INVALID;
746 static inline pte_t pte_mkspecial(pte_t pte)
748 pte_val(pte) |= _PAGE_SPECIAL;
752 #ifdef CONFIG_HUGETLB_PAGE
753 static inline pte_t pte_mkhuge(pte_t pte)
755 pte_val(pte) |= _PAGE_LARGE;
760 static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
762 unsigned long pto = (unsigned long) ptep;
764 /* Invalidation + global TLB flush for the pte */
767 : "=m" (*ptep) : "m" (*ptep), "a" (pto), "a" (address));
770 static inline void __ptep_ipte_local(unsigned long address, pte_t *ptep)
772 unsigned long pto = (unsigned long) ptep;
774 /* Invalidation + local TLB flush for the pte */
776 " .insn rrf,0xb2210000,%2,%3,0,1"
777 : "=m" (*ptep) : "m" (*ptep), "a" (pto), "a" (address));
780 static inline void __ptep_ipte_range(unsigned long address, int nr, pte_t *ptep)
782 unsigned long pto = (unsigned long) ptep;
784 /* Invalidate a range of ptes + global TLB flush of the ptes */
787 " .insn rrf,0xb2210000,%2,%0,%1,0"
788 : "+a" (address), "+a" (nr) : "a" (pto) : "memory");
793 * This is hard to understand. ptep_get_and_clear and ptep_clear_flush
794 * both clear the TLB for the unmapped pte. The reason is that
795 * ptep_get_and_clear is used in common code (e.g. change_pte_range)
796 * to modify an active pte. The sequence is
797 * 1) ptep_get_and_clear
800 * On s390 the tlb needs to get flushed with the modification of the pte
801 * if the pte is active. The only way how this can be implemented is to
802 * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range
805 pte_t ptep_xchg_direct(struct mm_struct *, unsigned long, pte_t *, pte_t);
806 pte_t ptep_xchg_lazy(struct mm_struct *, unsigned long, pte_t *, pte_t);
808 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
809 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
810 unsigned long addr, pte_t *ptep)
814 pte = ptep_xchg_direct(vma->vm_mm, addr, ptep, pte_mkold(pte));
815 return pte_young(pte);
818 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
819 static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
820 unsigned long address, pte_t *ptep)
822 return ptep_test_and_clear_young(vma, address, ptep);
825 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
826 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
827 unsigned long addr, pte_t *ptep)
829 return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
832 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
833 pte_t ptep_modify_prot_start(struct mm_struct *, unsigned long, pte_t *);
834 void ptep_modify_prot_commit(struct mm_struct *, unsigned long, pte_t *, pte_t);
836 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
837 static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
838 unsigned long addr, pte_t *ptep)
840 return ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID));
844 * The batched pte unmap code uses ptep_get_and_clear_full to clear the
845 * ptes. Here an optimization is possible. tlb_gather_mmu flushes all
846 * tlbs of an mm if it can guarantee that the ptes of the mm_struct
847 * cannot be accessed while the batched unmap is running. In this case
848 * full==1 and a simple pte_clear is enough. See tlb.h.
850 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
851 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
853 pte_t *ptep, int full)
857 *ptep = __pte(_PAGE_INVALID);
860 return ptep_xchg_lazy(mm, addr, ptep, __pte(_PAGE_INVALID));
863 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
864 static inline void ptep_set_wrprotect(struct mm_struct *mm,
865 unsigned long addr, pte_t *ptep)
870 ptep_xchg_lazy(mm, addr, ptep, pte_wrprotect(pte));
873 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
874 static inline int ptep_set_access_flags(struct vm_area_struct *vma,
875 unsigned long addr, pte_t *ptep,
876 pte_t entry, int dirty)
878 if (pte_same(*ptep, entry))
880 ptep_xchg_direct(vma->vm_mm, addr, ptep, entry);
885 * Additional functions to handle KVM guest page tables
887 void ptep_set_pte_at(struct mm_struct *mm, unsigned long addr,
888 pte_t *ptep, pte_t entry);
889 void ptep_set_notify(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
890 void ptep_notify(struct mm_struct *mm, unsigned long addr,
891 pte_t *ptep, unsigned long bits);
892 int ptep_force_prot(struct mm_struct *mm, unsigned long gaddr,
893 pte_t *ptep, int prot, unsigned long bit);
894 void ptep_zap_unused(struct mm_struct *mm, unsigned long addr,
895 pte_t *ptep , int reset);
896 void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
897 int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr,
898 pte_t *sptep, pte_t *tptep, pte_t pte);
899 void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep);
901 bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long address);
902 int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
903 unsigned char key, bool nq);
904 int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
905 unsigned char key, unsigned char *oldkey,
906 bool nq, bool mr, bool mc);
907 int reset_guest_reference_bit(struct mm_struct *mm, unsigned long addr);
908 int get_guest_storage_key(struct mm_struct *mm, unsigned long addr,
912 * Certain architectures need to do special things when PTEs
913 * within a page table are directly modified. Thus, the following
914 * hook is made available.
916 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
917 pte_t *ptep, pte_t entry)
919 if (mm_has_pgste(mm))
920 ptep_set_pte_at(mm, addr, ptep, entry);
926 * Conversion functions: convert a page and protection to a page entry,
927 * and a page entry and page directory to the page they refer to.
929 static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
932 pte_val(__pte) = physpage + pgprot_val(pgprot);
933 return pte_mkyoung(__pte);
936 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
938 unsigned long physpage = page_to_phys(page);
939 pte_t __pte = mk_pte_phys(physpage, pgprot);
941 if (pte_write(__pte) && PageDirty(page))
942 __pte = pte_mkdirty(__pte);
946 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
947 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
948 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
949 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
951 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
952 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
954 #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
955 #define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
956 #define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN)
958 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
960 pud_t *pud = (pud_t *) pgd;
961 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
962 pud = (pud_t *) pgd_deref(*pgd);
963 return pud + pud_index(address);
966 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
968 pmd_t *pmd = (pmd_t *) pud;
969 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
970 pmd = (pmd_t *) pud_deref(*pud);
971 return pmd + pmd_index(address);
974 #define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot))
975 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
976 #define pte_page(x) pfn_to_page(pte_pfn(x))
978 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
980 /* Find an entry in the lowest level page table.. */
981 #define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
982 #define pte_offset_kernel(pmd, address) pte_offset(pmd,address)
983 #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
984 #define pte_unmap(pte) do { } while (0)
986 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLB_PAGE)
987 static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
990 * pgprot is PAGE_NONE, PAGE_READ, or PAGE_WRITE (see __Pxxx / __Sxxx)
991 * Convert to segment table entry format.
993 if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))
994 return pgprot_val(SEGMENT_NONE);
995 if (pgprot_val(pgprot) == pgprot_val(PAGE_READ))
996 return pgprot_val(SEGMENT_READ);
997 return pgprot_val(SEGMENT_WRITE);
1000 static inline pmd_t pmd_wrprotect(pmd_t pmd)
1002 pmd_val(pmd) &= ~_SEGMENT_ENTRY_WRITE;
1003 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
1007 static inline pmd_t pmd_mkwrite(pmd_t pmd)
1009 pmd_val(pmd) |= _SEGMENT_ENTRY_WRITE;
1010 if (pmd_large(pmd) && !(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
1012 pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
1016 static inline pmd_t pmd_mkclean(pmd_t pmd)
1018 if (pmd_large(pmd)) {
1019 pmd_val(pmd) &= ~_SEGMENT_ENTRY_DIRTY;
1020 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
1025 static inline pmd_t pmd_mkdirty(pmd_t pmd)
1027 if (pmd_large(pmd)) {
1028 pmd_val(pmd) |= _SEGMENT_ENTRY_DIRTY |
1029 _SEGMENT_ENTRY_SOFT_DIRTY;
1030 if (pmd_val(pmd) & _SEGMENT_ENTRY_WRITE)
1031 pmd_val(pmd) &= ~_SEGMENT_ENTRY_PROTECT;
1036 static inline pmd_t pmd_mkyoung(pmd_t pmd)
1038 if (pmd_large(pmd)) {
1039 pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
1040 if (pmd_val(pmd) & _SEGMENT_ENTRY_READ)
1041 pmd_val(pmd) &= ~_SEGMENT_ENTRY_INVALID;
1046 static inline pmd_t pmd_mkold(pmd_t pmd)
1048 if (pmd_large(pmd)) {
1049 pmd_val(pmd) &= ~_SEGMENT_ENTRY_YOUNG;
1050 pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
1055 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
1057 if (pmd_large(pmd)) {
1058 pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN_LARGE |
1059 _SEGMENT_ENTRY_DIRTY | _SEGMENT_ENTRY_YOUNG |
1060 _SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_SOFT_DIRTY;
1061 pmd_val(pmd) |= massage_pgprot_pmd(newprot);
1062 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_DIRTY))
1063 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
1064 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_YOUNG))
1065 pmd_val(pmd) |= _SEGMENT_ENTRY_INVALID;
1068 pmd_val(pmd) &= _SEGMENT_ENTRY_ORIGIN;
1069 pmd_val(pmd) |= massage_pgprot_pmd(newprot);
1073 static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
1076 pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
1080 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLB_PAGE */
1082 static inline void __pmdp_csp(pmd_t *pmdp)
1084 register unsigned long reg2 asm("2") = pmd_val(*pmdp);
1085 register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
1086 _SEGMENT_ENTRY_INVALID;
1087 register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
1092 : "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
1095 static inline void __pmdp_idte(unsigned long address, pmd_t *pmdp)
1099 sto = (unsigned long) pmdp - pmd_index(address) * sizeof(pmd_t);
1101 " .insn rrf,0xb98e0000,%2,%3,0,0"
1103 : "m" (*pmdp), "a" (sto), "a" ((address & HPAGE_MASK))
1107 static inline void __pmdp_idte_local(unsigned long address, pmd_t *pmdp)
1111 sto = (unsigned long) pmdp - pmd_index(address) * sizeof(pmd_t);
1113 " .insn rrf,0xb98e0000,%2,%3,0,1"
1115 : "m" (*pmdp), "a" (sto), "a" ((address & HPAGE_MASK))
1119 pmd_t pmdp_xchg_direct(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
1120 pmd_t pmdp_xchg_lazy(struct mm_struct *, unsigned long, pmd_t *, pmd_t);
1122 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1124 #define __HAVE_ARCH_PGTABLE_DEPOSIT
1125 void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
1128 #define __HAVE_ARCH_PGTABLE_WITHDRAW
1129 pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
1131 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1132 static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
1133 unsigned long addr, pmd_t *pmdp,
1134 pmd_t entry, int dirty)
1136 VM_BUG_ON(addr & ~HPAGE_MASK);
1138 entry = pmd_mkyoung(entry);
1140 entry = pmd_mkdirty(entry);
1141 if (pmd_val(*pmdp) == pmd_val(entry))
1143 pmdp_xchg_direct(vma->vm_mm, addr, pmdp, entry);
1147 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1148 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1149 unsigned long addr, pmd_t *pmdp)
1153 pmd = pmdp_xchg_direct(vma->vm_mm, addr, pmdp, pmd_mkold(pmd));
1154 return pmd_young(pmd);
1157 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1158 static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
1159 unsigned long addr, pmd_t *pmdp)
1161 VM_BUG_ON(addr & ~HPAGE_MASK);
1162 return pmdp_test_and_clear_young(vma, addr, pmdp);
1165 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1166 pmd_t *pmdp, pmd_t entry)
1171 static inline pmd_t pmd_mkhuge(pmd_t pmd)
1173 pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
1174 pmd_val(pmd) |= _SEGMENT_ENTRY_YOUNG;
1175 pmd_val(pmd) |= _SEGMENT_ENTRY_PROTECT;
1179 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1180 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
1181 unsigned long addr, pmd_t *pmdp)
1183 return pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
1186 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR_FULL
1187 static inline pmd_t pmdp_huge_get_and_clear_full(struct mm_struct *mm,
1189 pmd_t *pmdp, int full)
1193 *pmdp = __pmd(_SEGMENT_ENTRY_INVALID);
1196 return pmdp_xchg_lazy(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
1199 #define __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
1200 static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
1201 unsigned long addr, pmd_t *pmdp)
1203 return pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
1206 #define __HAVE_ARCH_PMDP_INVALIDATE
1207 static inline void pmdp_invalidate(struct vm_area_struct *vma,
1208 unsigned long addr, pmd_t *pmdp)
1210 pmdp_xchg_direct(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_INVALID));
1213 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1214 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1215 unsigned long addr, pmd_t *pmdp)
1220 pmd = pmdp_xchg_lazy(mm, addr, pmdp, pmd_wrprotect(pmd));
1223 static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
1224 unsigned long address,
1227 return pmdp_huge_get_and_clear(vma->vm_mm, address, pmdp);
1229 #define pmdp_collapse_flush pmdp_collapse_flush
1231 #define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
1232 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1234 static inline int pmd_trans_huge(pmd_t pmd)
1236 return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE;
1239 #define has_transparent_hugepage has_transparent_hugepage
1240 static inline int has_transparent_hugepage(void)
1242 return MACHINE_HAS_HPAGE ? 1 : 0;
1244 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1247 * 64 bit swap entry format:
1248 * A page-table entry has some bits we have to treat in a special way.
1249 * Bits 52 and bit 55 have to be zero, otherwise a specification
1250 * exception will occur instead of a page translation exception. The
1251 * specification exception has the bad habit not to store necessary
1252 * information in the lowcore.
1253 * Bits 54 and 63 are used to indicate the page type.
1254 * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200
1255 * This leaves the bits 0-51 and bits 56-62 to store type and offset.
1256 * We use the 5 bits from 57-61 for the type and the 52 bits from 0-51
1258 * | offset |01100|type |00|
1259 * |0000000000111111111122222222223333333333444444444455|55555|55566|66|
1260 * |0123456789012345678901234567890123456789012345678901|23456|78901|23|
1263 #define __SWP_OFFSET_MASK ((1UL << 52) - 1)
1264 #define __SWP_OFFSET_SHIFT 12
1265 #define __SWP_TYPE_MASK ((1UL << 5) - 1)
1266 #define __SWP_TYPE_SHIFT 2
1268 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
1272 pte_val(pte) = _PAGE_INVALID | _PAGE_PROTECT;
1273 pte_val(pte) |= (offset & __SWP_OFFSET_MASK) << __SWP_OFFSET_SHIFT;
1274 pte_val(pte) |= (type & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT;
1278 static inline unsigned long __swp_type(swp_entry_t entry)
1280 return (entry.val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK;
1283 static inline unsigned long __swp_offset(swp_entry_t entry)
1285 return (entry.val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK;
1288 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
1290 return (swp_entry_t) { pte_val(mk_swap_pte(type, offset)) };
1293 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
1294 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
1296 #endif /* !__ASSEMBLY__ */
1298 #define kern_addr_valid(addr) (1)
1300 extern int vmem_add_mapping(unsigned long start, unsigned long size);
1301 extern int vmem_remove_mapping(unsigned long start, unsigned long size);
1302 extern int s390_enable_sie(void);
1303 extern int s390_enable_skey(void);
1304 extern void s390_reset_cmma(struct mm_struct *mm);
1306 /* s390 has a private copy of get unmapped area to deal with cache synonyms */
1307 #define HAVE_ARCH_UNMAPPED_AREA
1308 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
1311 * No page table caches to initialise
1313 static inline void pgtable_cache_init(void) { }
1314 static inline void check_pgt_cache(void) { }
1316 #include <asm-generic/pgtable.h>
1318 #endif /* _S390_PAGE_H */