3 * Copyright IBM Corp. 1999, 2000
4 * Author(s): Hartmut Penner (hp@de.ibm.com)
5 * Ulrich Weigand (weigand@de.ibm.com)
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
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. For
16 * s390 31 bit we "fold" the mid level into the top-level page table, so
17 * that we physically have the same two-level page table as the s390 mmu
18 * expects in 31 bit mode. For s390 64 bit we use three of the five levels
19 * the hardware provides (region first and region second tables are not
22 * The "pgd_xxx()" functions are trivial for a folded two-level
23 * setup: the pgd is never bad, and a pmd always exists (as it's folded
26 * This file contains the functions and defines necessary to modify and use
27 * the S390 page table tree.
30 #include <linux/sched.h>
31 #include <linux/mm_types.h>
35 extern pgd_t swapper_pg_dir[] __attribute__ ((aligned (4096)));
36 extern void paging_init(void);
37 extern void vmem_map_init(void);
38 extern void fault_init(void);
41 * The S390 doesn't have any external MMU info: the kernel page
42 * tables contain all the necessary information.
44 #define update_mmu_cache(vma, address, ptep) do { } while (0)
45 #define update_mmu_cache_pmd(vma, address, ptep) do { } while (0)
48 * ZERO_PAGE is a global shared page that is always zero; used
49 * for zero-mapped memory areas etc..
52 extern unsigned long empty_zero_page;
53 extern unsigned long zero_page_mask;
55 #define ZERO_PAGE(vaddr) \
56 (virt_to_page((void *)(empty_zero_page + \
57 (((unsigned long)(vaddr)) &zero_page_mask))))
59 #define is_zero_pfn is_zero_pfn
60 static inline int is_zero_pfn(unsigned long pfn)
62 extern unsigned long zero_pfn;
63 unsigned long offset_from_zero_pfn = pfn - zero_pfn;
64 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
67 #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
69 #endif /* !__ASSEMBLY__ */
72 * PMD_SHIFT determines the size of the area a second-level page
74 * PGDIR_SHIFT determines what a third-level page table entry can map
79 # define PGDIR_SHIFT 20
80 #else /* CONFIG_64BIT */
83 # define PGDIR_SHIFT 42
84 #endif /* CONFIG_64BIT */
86 #define PMD_SIZE (1UL << PMD_SHIFT)
87 #define PMD_MASK (~(PMD_SIZE-1))
88 #define PUD_SIZE (1UL << PUD_SHIFT)
89 #define PUD_MASK (~(PUD_SIZE-1))
90 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
91 #define PGDIR_MASK (~(PGDIR_SIZE-1))
94 * entries per page directory level: the S390 is two-level, so
95 * we don't really have any PMD directory physically.
96 * for S390 segment-table entries are combined to one PGD
97 * that leads to 1024 pte per pgd
99 #define PTRS_PER_PTE 256
101 #define PTRS_PER_PMD 1
102 #define PTRS_PER_PUD 1
103 #else /* CONFIG_64BIT */
104 #define PTRS_PER_PMD 2048
105 #define PTRS_PER_PUD 2048
106 #endif /* CONFIG_64BIT */
107 #define PTRS_PER_PGD 2048
109 #define FIRST_USER_ADDRESS 0
111 #define pte_ERROR(e) \
112 printk("%s:%d: bad pte %p.\n", __FILE__, __LINE__, (void *) pte_val(e))
113 #define pmd_ERROR(e) \
114 printk("%s:%d: bad pmd %p.\n", __FILE__, __LINE__, (void *) pmd_val(e))
115 #define pud_ERROR(e) \
116 printk("%s:%d: bad pud %p.\n", __FILE__, __LINE__, (void *) pud_val(e))
117 #define pgd_ERROR(e) \
118 printk("%s:%d: bad pgd %p.\n", __FILE__, __LINE__, (void *) pgd_val(e))
122 * The vmalloc and module area will always be on the topmost area of the kernel
123 * mapping. We reserve 96MB (31bit) / 128GB (64bit) for vmalloc and modules.
124 * On 64 bit kernels we have a 2GB area at the top of the vmalloc area where
125 * modules will reside. That makes sure that inter module branches always
126 * happen without trampolines and in addition the placement within a 2GB frame
127 * is branch prediction unit friendly.
129 extern unsigned long VMALLOC_START;
130 extern unsigned long VMALLOC_END;
131 extern struct page *vmemmap;
133 #define VMEM_MAX_PHYS ((unsigned long) vmemmap)
136 extern unsigned long MODULES_VADDR;
137 extern unsigned long MODULES_END;
138 #define MODULES_VADDR MODULES_VADDR
139 #define MODULES_END MODULES_END
140 #define MODULES_LEN (1UL << 31)
144 * A 31 bit pagetable entry of S390 has following format:
147 * 00000000001111111111222222222233
148 * 01234567890123456789012345678901
150 * I Page-Invalid Bit: Page is not available for address-translation
151 * P Page-Protection Bit: Store access not possible for page
153 * A 31 bit segmenttable entry of S390 has following format:
154 * | P-table origin | |PTL
156 * 00000000001111111111222222222233
157 * 01234567890123456789012345678901
159 * I Segment-Invalid Bit: Segment is not available for address-translation
160 * C Common-Segment Bit: Segment is not private (PoP 3-30)
161 * PTL Page-Table-Length: Page-table length (PTL+1*16 entries -> up to 256)
163 * The 31 bit segmenttable origin of S390 has following format:
165 * |S-table origin | | STL |
167 * 00000000001111111111222222222233
168 * 01234567890123456789012345678901
170 * X Space-Switch event:
171 * G Segment-Invalid Bit: *
172 * P Private-Space Bit: Segment is not private (PoP 3-30)
173 * S Storage-Alteration:
174 * STL Segment-Table-Length: Segment-table length (STL+1*16 entries -> up to 2048)
176 * A 64 bit pagetable entry of S390 has following format:
178 * 0000000000111111111122222222223333333333444444444455555555556666
179 * 0123456789012345678901234567890123456789012345678901234567890123
181 * I Page-Invalid Bit: Page is not available for address-translation
182 * P Page-Protection Bit: Store access not possible for page
183 * C Change-bit override: HW is not required to set change bit
185 * A 64 bit segmenttable entry of S390 has following format:
186 * | P-table origin | TT
187 * 0000000000111111111122222222223333333333444444444455555555556666
188 * 0123456789012345678901234567890123456789012345678901234567890123
190 * I Segment-Invalid Bit: Segment is not available for address-translation
191 * C Common-Segment Bit: Segment is not private (PoP 3-30)
192 * P Page-Protection Bit: Store access not possible for page
195 * A 64 bit region table entry of S390 has following format:
196 * | S-table origin | TF TTTL
197 * 0000000000111111111122222222223333333333444444444455555555556666
198 * 0123456789012345678901234567890123456789012345678901234567890123
200 * I Segment-Invalid Bit: Segment is not available for address-translation
205 * The 64 bit regiontable origin of S390 has following format:
206 * | region table origon | DTTL
207 * 0000000000111111111122222222223333333333444444444455555555556666
208 * 0123456789012345678901234567890123456789012345678901234567890123
210 * X Space-Switch event:
211 * G Segment-Invalid Bit:
212 * P Private-Space Bit:
213 * S Storage-Alteration:
217 * A storage key has the following format:
221 * F : fetch protection bit
226 /* Hardware bits in the page table entry */
227 #define _PAGE_CO 0x100 /* HW Change-bit override */
228 #define _PAGE_RO 0x200 /* HW read-only bit */
229 #define _PAGE_INVALID 0x400 /* HW invalid bit */
231 /* Software bits in the page table entry */
232 #define _PAGE_SWT 0x001 /* SW pte type bit t */
233 #define _PAGE_SWX 0x002 /* SW pte type bit x */
234 #define _PAGE_SWC 0x004 /* SW pte changed bit (for KVM) */
235 #define _PAGE_SWR 0x008 /* SW pte referenced bit (for KVM) */
236 #define _PAGE_SPECIAL 0x010 /* SW associated with special page */
237 #define __HAVE_ARCH_PTE_SPECIAL
239 /* Set of bits not changed in pte_modify */
240 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_SPECIAL | _PAGE_SWC | _PAGE_SWR)
242 /* Six different types of pages. */
243 #define _PAGE_TYPE_EMPTY 0x400
244 #define _PAGE_TYPE_NONE 0x401
245 #define _PAGE_TYPE_SWAP 0x403
246 #define _PAGE_TYPE_FILE 0x601 /* bit 0x002 is used for offset !! */
247 #define _PAGE_TYPE_RO 0x200
248 #define _PAGE_TYPE_RW 0x000
251 * Only four types for huge pages, using the invalid bit and protection bit
252 * of a segment table entry.
254 #define _HPAGE_TYPE_EMPTY 0x020 /* _SEGMENT_ENTRY_INV */
255 #define _HPAGE_TYPE_NONE 0x220
256 #define _HPAGE_TYPE_RO 0x200 /* _SEGMENT_ENTRY_RO */
257 #define _HPAGE_TYPE_RW 0x000
260 * PTE type bits are rather complicated. handle_pte_fault uses pte_present,
261 * pte_none and pte_file to find out the pte type WITHOUT holding the page
262 * table lock. ptep_clear_flush on the other hand uses ptep_clear_flush to
263 * invalidate a given pte. ipte sets the hw invalid bit and clears all tlbs
264 * for the page. The page table entry is set to _PAGE_TYPE_EMPTY afterwards.
265 * This change is done while holding the lock, but the intermediate step
266 * of a previously valid pte with the hw invalid bit set can be observed by
267 * handle_pte_fault. That makes it necessary that all valid pte types with
268 * the hw invalid bit set must be distinguishable from the four pte types
269 * empty, none, swap and file.
272 * _PAGE_TYPE_EMPTY 1000 -> 1000
273 * _PAGE_TYPE_NONE 1001 -> 1001
274 * _PAGE_TYPE_SWAP 1011 -> 1011
275 * _PAGE_TYPE_FILE 11?1 -> 11?1
276 * _PAGE_TYPE_RO 0100 -> 1100
277 * _PAGE_TYPE_RW 0000 -> 1000
279 * pte_none is true for bits combinations 1000, 1010, 1100, 1110
280 * pte_present is true for bits combinations 0000, 0010, 0100, 0110, 1001
281 * pte_file is true for bits combinations 1101, 1111
282 * swap pte is 1011 and 0001, 0011, 0101, 0111 are invalid.
287 /* Bits in the segment table address-space-control-element */
288 #define _ASCE_SPACE_SWITCH 0x80000000UL /* space switch event */
289 #define _ASCE_ORIGIN_MASK 0x7ffff000UL /* segment table origin */
290 #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
291 #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
292 #define _ASCE_TABLE_LENGTH 0x7f /* 128 x 64 entries = 8k */
294 /* Bits in the segment table entry */
295 #define _SEGMENT_ENTRY_ORIGIN 0x7fffffc0UL /* page table origin */
296 #define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
297 #define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
298 #define _SEGMENT_ENTRY_COMMON 0x10 /* common segment bit */
299 #define _SEGMENT_ENTRY_PTL 0x0f /* page table length */
301 #define _SEGMENT_ENTRY (_SEGMENT_ENTRY_PTL)
302 #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
304 /* Page status table bits for virtualization */
305 #define RCP_ACC_BITS 0xf0000000UL
306 #define RCP_FP_BIT 0x08000000UL
307 #define RCP_PCL_BIT 0x00800000UL
308 #define RCP_HR_BIT 0x00400000UL
309 #define RCP_HC_BIT 0x00200000UL
310 #define RCP_GR_BIT 0x00040000UL
311 #define RCP_GC_BIT 0x00020000UL
313 /* User dirty / referenced bit for KVM's migration feature */
314 #define KVM_UR_BIT 0x00008000UL
315 #define KVM_UC_BIT 0x00004000UL
317 #else /* CONFIG_64BIT */
319 /* Bits in the segment/region table address-space-control-element */
320 #define _ASCE_ORIGIN ~0xfffUL/* segment table origin */
321 #define _ASCE_PRIVATE_SPACE 0x100 /* private space control */
322 #define _ASCE_ALT_EVENT 0x80 /* storage alteration event control */
323 #define _ASCE_SPACE_SWITCH 0x40 /* space switch event */
324 #define _ASCE_REAL_SPACE 0x20 /* real space control */
325 #define _ASCE_TYPE_MASK 0x0c /* asce table type mask */
326 #define _ASCE_TYPE_REGION1 0x0c /* region first table type */
327 #define _ASCE_TYPE_REGION2 0x08 /* region second table type */
328 #define _ASCE_TYPE_REGION3 0x04 /* region third table type */
329 #define _ASCE_TYPE_SEGMENT 0x00 /* segment table type */
330 #define _ASCE_TABLE_LENGTH 0x03 /* region table length */
332 /* Bits in the region table entry */
333 #define _REGION_ENTRY_ORIGIN ~0xfffUL/* region/segment table origin */
334 #define _REGION_ENTRY_INV 0x20 /* invalid region table entry */
335 #define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */
336 #define _REGION_ENTRY_TYPE_R1 0x0c /* region first table type */
337 #define _REGION_ENTRY_TYPE_R2 0x08 /* region second table type */
338 #define _REGION_ENTRY_TYPE_R3 0x04 /* region third table type */
339 #define _REGION_ENTRY_LENGTH 0x03 /* region third length */
341 #define _REGION1_ENTRY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_LENGTH)
342 #define _REGION1_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INV)
343 #define _REGION2_ENTRY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_LENGTH)
344 #define _REGION2_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INV)
345 #define _REGION3_ENTRY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_LENGTH)
346 #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
348 /* Bits in the segment table entry */
349 #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
350 #define _SEGMENT_ENTRY_RO 0x200 /* page protection bit */
351 #define _SEGMENT_ENTRY_INV 0x20 /* invalid segment table entry */
353 #define _SEGMENT_ENTRY (0)
354 #define _SEGMENT_ENTRY_EMPTY (_SEGMENT_ENTRY_INV)
356 #define _SEGMENT_ENTRY_LARGE 0x400 /* STE-format control, large page */
357 #define _SEGMENT_ENTRY_CO 0x100 /* change-recording override */
358 #define _SEGMENT_ENTRY_SPLIT_BIT 0 /* THP splitting bit number */
359 #define _SEGMENT_ENTRY_SPLIT (1UL << _SEGMENT_ENTRY_SPLIT_BIT)
361 /* Set of bits not changed in pmd_modify */
362 #define _SEGMENT_CHG_MASK (_SEGMENT_ENTRY_ORIGIN | _SEGMENT_ENTRY_LARGE \
363 | _SEGMENT_ENTRY_SPLIT | _SEGMENT_ENTRY_CO)
365 /* Page status table bits for virtualization */
366 #define RCP_ACC_BITS 0xf000000000000000UL
367 #define RCP_FP_BIT 0x0800000000000000UL
368 #define RCP_PCL_BIT 0x0080000000000000UL
369 #define RCP_HR_BIT 0x0040000000000000UL
370 #define RCP_HC_BIT 0x0020000000000000UL
371 #define RCP_GR_BIT 0x0004000000000000UL
372 #define RCP_GC_BIT 0x0002000000000000UL
374 /* User dirty / referenced bit for KVM's migration feature */
375 #define KVM_UR_BIT 0x0000800000000000UL
376 #define KVM_UC_BIT 0x0000400000000000UL
378 #endif /* CONFIG_64BIT */
381 * A user page table pointer has the space-switch-event bit, the
382 * private-space-control bit and the storage-alteration-event-control
383 * bit set. A kernel page table pointer doesn't need them.
385 #define _ASCE_USER_BITS (_ASCE_SPACE_SWITCH | _ASCE_PRIVATE_SPACE | \
389 * Page protection definitions.
391 #define PAGE_NONE __pgprot(_PAGE_TYPE_NONE)
392 #define PAGE_RO __pgprot(_PAGE_TYPE_RO)
393 #define PAGE_RW __pgprot(_PAGE_TYPE_RW)
395 #define PAGE_KERNEL PAGE_RW
396 #define PAGE_COPY PAGE_RO
399 * On s390 the page table entry has an invalid bit and a read-only bit.
400 * Read permission implies execute permission and write permission
401 * implies read permission.
404 #define __P000 PAGE_NONE
405 #define __P001 PAGE_RO
406 #define __P010 PAGE_RO
407 #define __P011 PAGE_RO
408 #define __P100 PAGE_RO
409 #define __P101 PAGE_RO
410 #define __P110 PAGE_RO
411 #define __P111 PAGE_RO
413 #define __S000 PAGE_NONE
414 #define __S001 PAGE_RO
415 #define __S010 PAGE_RW
416 #define __S011 PAGE_RW
417 #define __S100 PAGE_RO
418 #define __S101 PAGE_RO
419 #define __S110 PAGE_RW
420 #define __S111 PAGE_RW
422 static inline int mm_exclusive(struct mm_struct *mm)
424 return likely(mm == current->active_mm &&
425 atomic_read(&mm->context.attach_count) <= 1);
428 static inline int mm_has_pgste(struct mm_struct *mm)
431 if (unlikely(mm->context.has_pgste))
437 * pgd/pmd/pte query functions
441 static inline int pgd_present(pgd_t pgd) { return 1; }
442 static inline int pgd_none(pgd_t pgd) { return 0; }
443 static inline int pgd_bad(pgd_t pgd) { return 0; }
445 static inline int pud_present(pud_t pud) { return 1; }
446 static inline int pud_none(pud_t pud) { return 0; }
447 static inline int pud_bad(pud_t pud) { return 0; }
449 #else /* CONFIG_64BIT */
451 static inline int pgd_present(pgd_t pgd)
453 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
455 return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
458 static inline int pgd_none(pgd_t pgd)
460 if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
462 return (pgd_val(pgd) & _REGION_ENTRY_INV) != 0UL;
465 static inline int pgd_bad(pgd_t pgd)
468 * With dynamic page table levels the pgd can be a region table
469 * entry or a segment table entry. Check for the bit that are
470 * invalid for either table entry.
473 ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
474 ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
475 return (pgd_val(pgd) & mask) != 0;
478 static inline int pud_present(pud_t pud)
480 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
482 return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
485 static inline int pud_none(pud_t pud)
487 if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
489 return (pud_val(pud) & _REGION_ENTRY_INV) != 0UL;
492 static inline int pud_bad(pud_t pud)
495 * With dynamic page table levels the pud can be a region table
496 * entry or a segment table entry. Check for the bit that are
497 * invalid for either table entry.
500 ~_SEGMENT_ENTRY_ORIGIN & ~_REGION_ENTRY_INV &
501 ~_REGION_ENTRY_TYPE_MASK & ~_REGION_ENTRY_LENGTH;
502 return (pud_val(pud) & mask) != 0;
505 #endif /* CONFIG_64BIT */
507 static inline int pmd_present(pmd_t pmd)
509 unsigned long mask = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO;
510 return (pmd_val(pmd) & mask) == _HPAGE_TYPE_NONE ||
511 !(pmd_val(pmd) & _SEGMENT_ENTRY_INV);
514 static inline int pmd_none(pmd_t pmd)
516 return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) &&
517 !(pmd_val(pmd) & _SEGMENT_ENTRY_RO);
520 static inline int pmd_large(pmd_t pmd)
523 return !!(pmd_val(pmd) & _SEGMENT_ENTRY_LARGE);
529 static inline int pmd_bad(pmd_t pmd)
531 unsigned long mask = ~_SEGMENT_ENTRY_ORIGIN & ~_SEGMENT_ENTRY_INV;
532 return (pmd_val(pmd) & mask) != _SEGMENT_ENTRY;
535 #define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
536 extern void pmdp_splitting_flush(struct vm_area_struct *vma,
537 unsigned long addr, pmd_t *pmdp);
539 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
540 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
541 unsigned long address, pmd_t *pmdp,
542 pmd_t entry, int dirty);
544 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
545 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
546 unsigned long address, pmd_t *pmdp);
548 #define __HAVE_ARCH_PMD_WRITE
549 static inline int pmd_write(pmd_t pmd)
551 return (pmd_val(pmd) & _SEGMENT_ENTRY_RO) == 0;
554 static inline int pmd_young(pmd_t pmd)
559 static inline int pte_none(pte_t pte)
561 return (pte_val(pte) & _PAGE_INVALID) && !(pte_val(pte) & _PAGE_SWT);
564 static inline int pte_present(pte_t pte)
566 unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT | _PAGE_SWX;
567 return (pte_val(pte) & mask) == _PAGE_TYPE_NONE ||
568 (!(pte_val(pte) & _PAGE_INVALID) &&
569 !(pte_val(pte) & _PAGE_SWT));
572 static inline int pte_file(pte_t pte)
574 unsigned long mask = _PAGE_RO | _PAGE_INVALID | _PAGE_SWT;
575 return (pte_val(pte) & mask) == _PAGE_TYPE_FILE;
578 static inline int pte_special(pte_t pte)
580 return (pte_val(pte) & _PAGE_SPECIAL);
583 #define __HAVE_ARCH_PTE_SAME
584 static inline int pte_same(pte_t a, pte_t b)
586 return pte_val(a) == pte_val(b);
589 static inline pgste_t pgste_get_lock(pte_t *ptep)
591 unsigned long new = 0;
599 " nihh %0,0xff7f\n" /* clear RCP_PCL_BIT in old */
600 " oihh %1,0x0080\n" /* set RCP_PCL_BIT in new */
603 : "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
604 : "Q" (ptep[PTRS_PER_PTE]) : "cc");
609 static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
613 " nihh %1,0xff7f\n" /* clear RCP_PCL_BIT */
615 : "=Q" (ptep[PTRS_PER_PTE])
616 : "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc");
621 static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
624 unsigned long address, bits;
627 if (!pte_present(*ptep))
629 address = pte_val(*ptep) & PAGE_MASK;
630 skey = page_get_storage_key(address);
631 bits = skey & (_PAGE_CHANGED | _PAGE_REFERENCED);
632 /* Clear page changed & referenced bit in the storage key */
633 if (bits & _PAGE_CHANGED)
634 page_set_storage_key(address, skey ^ bits, 1);
636 page_reset_referenced(address);
637 /* Transfer page changed & referenced bit to guest bits in pgste */
638 pgste_val(pgste) |= bits << 48; /* RCP_GR_BIT & RCP_GC_BIT */
639 /* Get host changed & referenced bits from pgste */
640 bits |= (pgste_val(pgste) & (RCP_HR_BIT | RCP_HC_BIT)) >> 52;
641 /* Clear host bits in pgste. */
642 pgste_val(pgste) &= ~(RCP_HR_BIT | RCP_HC_BIT);
643 pgste_val(pgste) &= ~(RCP_ACC_BITS | RCP_FP_BIT);
644 /* Copy page access key and fetch protection bit to pgste */
646 (unsigned long) (skey & (_PAGE_ACC_BITS | _PAGE_FP_BIT)) << 56;
647 /* Transfer changed and referenced to kvm user bits */
648 pgste_val(pgste) |= bits << 45; /* KVM_UR_BIT & KVM_UC_BIT */
649 /* Transfer changed & referenced to pte sofware bits */
650 pte_val(*ptep) |= bits << 1; /* _PAGE_SWR & _PAGE_SWC */
656 static inline pgste_t pgste_update_young(pte_t *ptep, pgste_t pgste)
661 if (!pte_present(*ptep))
663 young = page_reset_referenced(pte_val(*ptep) & PAGE_MASK);
664 /* Transfer page referenced bit to pte software bit (host view) */
665 if (young || (pgste_val(pgste) & RCP_HR_BIT))
666 pte_val(*ptep) |= _PAGE_SWR;
667 /* Clear host referenced bit in pgste. */
668 pgste_val(pgste) &= ~RCP_HR_BIT;
669 /* Transfer page referenced bit to guest bit in pgste */
670 pgste_val(pgste) |= (unsigned long) young << 50; /* set RCP_GR_BIT */
676 static inline void pgste_set_pte(pte_t *ptep, pgste_t pgste, pte_t entry)
679 unsigned long address;
680 unsigned long okey, nkey;
682 if (!pte_present(entry))
684 address = pte_val(entry) & PAGE_MASK;
685 okey = nkey = page_get_storage_key(address);
686 nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
687 /* Set page access key and fetch protection bit from pgste */
688 nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
690 page_set_storage_key(address, nkey, 1);
695 * struct gmap_struct - guest address space
696 * @mm: pointer to the parent mm_struct
697 * @table: pointer to the page directory
698 * @asce: address space control element for gmap page table
699 * @crst_list: list of all crst tables used in the guest address space
702 struct list_head list;
703 struct mm_struct *mm;
704 unsigned long *table;
706 struct list_head crst_list;
710 * struct gmap_rmap - reverse mapping for segment table entries
711 * @next: pointer to the next gmap_rmap structure in the list
712 * @entry: pointer to a segment table entry
715 struct list_head list;
716 unsigned long *entry;
720 * struct gmap_pgtable - gmap information attached to a page table
721 * @vmaddr: address of the 1MB segment in the process virtual memory
722 * @mapper: list of segment table entries maping a page table
724 struct gmap_pgtable {
725 unsigned long vmaddr;
726 struct list_head mapper;
729 struct gmap *gmap_alloc(struct mm_struct *mm);
730 void gmap_free(struct gmap *gmap);
731 void gmap_enable(struct gmap *gmap);
732 void gmap_disable(struct gmap *gmap);
733 int gmap_map_segment(struct gmap *gmap, unsigned long from,
734 unsigned long to, unsigned long length);
735 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
736 unsigned long __gmap_fault(unsigned long address, struct gmap *);
737 unsigned long gmap_fault(unsigned long address, struct gmap *);
738 void gmap_discard(unsigned long from, unsigned long to, struct gmap *);
741 * Certain architectures need to do special things when PTEs
742 * within a page table are directly modified. Thus, the following
743 * hook is made available.
745 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
746 pte_t *ptep, pte_t entry)
750 if (mm_has_pgste(mm)) {
751 pgste = pgste_get_lock(ptep);
752 pgste_set_pte(ptep, pgste, entry);
754 pgste_set_unlock(ptep, pgste);
760 * query functions pte_write/pte_dirty/pte_young only work if
761 * pte_present() is true. Undefined behaviour if not..
763 static inline int pte_write(pte_t pte)
765 return (pte_val(pte) & _PAGE_RO) == 0;
768 static inline int pte_dirty(pte_t pte)
771 if (pte_val(pte) & _PAGE_SWC)
777 static inline int pte_young(pte_t pte)
780 if (pte_val(pte) & _PAGE_SWR)
787 * pgd/pmd/pte modification functions
790 static inline void pgd_clear(pgd_t *pgd)
793 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
794 pgd_val(*pgd) = _REGION2_ENTRY_EMPTY;
798 static inline void pud_clear(pud_t *pud)
801 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
802 pud_val(*pud) = _REGION3_ENTRY_EMPTY;
806 static inline void pmd_clear(pmd_t *pmdp)
808 pmd_val(*pmdp) = _SEGMENT_ENTRY_EMPTY;
811 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
813 pte_val(*ptep) = _PAGE_TYPE_EMPTY;
817 * The following pte modification functions only work if
818 * pte_present() is true. Undefined behaviour if not..
820 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
822 pte_val(pte) &= _PAGE_CHG_MASK;
823 pte_val(pte) |= pgprot_val(newprot);
827 static inline pte_t pte_wrprotect(pte_t pte)
829 /* Do not clobber _PAGE_TYPE_NONE pages! */
830 if (!(pte_val(pte) & _PAGE_INVALID))
831 pte_val(pte) |= _PAGE_RO;
835 static inline pte_t pte_mkwrite(pte_t pte)
837 pte_val(pte) &= ~_PAGE_RO;
841 static inline pte_t pte_mkclean(pte_t pte)
844 pte_val(pte) &= ~_PAGE_SWC;
849 static inline pte_t pte_mkdirty(pte_t pte)
854 static inline pte_t pte_mkold(pte_t pte)
857 pte_val(pte) &= ~_PAGE_SWR;
862 static inline pte_t pte_mkyoung(pte_t pte)
867 static inline pte_t pte_mkspecial(pte_t pte)
869 pte_val(pte) |= _PAGE_SPECIAL;
873 #ifdef CONFIG_HUGETLB_PAGE
874 static inline pte_t pte_mkhuge(pte_t pte)
877 * PROT_NONE needs to be remapped from the pte type to the ste type.
878 * The HW invalid bit is also different for pte and ste. The pte
879 * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
880 * bit, so we don't have to clear it.
882 if (pte_val(pte) & _PAGE_INVALID) {
883 if (pte_val(pte) & _PAGE_SWT)
884 pte_val(pte) |= _HPAGE_TYPE_NONE;
885 pte_val(pte) |= _SEGMENT_ENTRY_INV;
888 * Clear SW pte bits SWT and SWX, there are no SW bits in a segment
891 pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
893 * Also set the change-override bit because we don't need dirty bit
894 * tracking for hugetlbfs pages.
896 pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
902 * Get (and clear) the user dirty bit for a pte.
904 static inline int ptep_test_and_clear_user_dirty(struct mm_struct *mm,
910 if (mm_has_pgste(mm)) {
911 pgste = pgste_get_lock(ptep);
912 pgste = pgste_update_all(ptep, pgste);
913 dirty = !!(pgste_val(pgste) & KVM_UC_BIT);
914 pgste_val(pgste) &= ~KVM_UC_BIT;
915 pgste_set_unlock(ptep, pgste);
922 * Get (and clear) the user referenced bit for a pte.
924 static inline int ptep_test_and_clear_user_young(struct mm_struct *mm,
930 if (mm_has_pgste(mm)) {
931 pgste = pgste_get_lock(ptep);
932 pgste = pgste_update_young(ptep, pgste);
933 young = !!(pgste_val(pgste) & KVM_UR_BIT);
934 pgste_val(pgste) &= ~KVM_UR_BIT;
935 pgste_set_unlock(ptep, pgste);
940 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
941 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
942 unsigned long addr, pte_t *ptep)
947 if (mm_has_pgste(vma->vm_mm)) {
948 pgste = pgste_get_lock(ptep);
949 pgste = pgste_update_young(ptep, pgste);
951 *ptep = pte_mkold(pte);
952 pgste_set_unlock(ptep, pgste);
953 return pte_young(pte);
958 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
959 static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
960 unsigned long address, pte_t *ptep)
962 /* No need to flush TLB
963 * On s390 reference bits are in storage key and never in TLB
964 * With virtualization we handle the reference bit, without we
965 * we can simply return */
966 return ptep_test_and_clear_young(vma, address, ptep);
969 static inline void __ptep_ipte(unsigned long address, pte_t *ptep)
971 if (!(pte_val(*ptep) & _PAGE_INVALID)) {
973 /* pto must point to the start of the segment table */
974 pte_t *pto = (pte_t *) (((unsigned long) ptep) & 0x7ffffc00);
976 /* ipte in zarch mode can do the math */
981 : "=m" (*ptep) : "m" (*ptep),
982 "a" (pto), "a" (address));
987 * This is hard to understand. ptep_get_and_clear and ptep_clear_flush
988 * both clear the TLB for the unmapped pte. The reason is that
989 * ptep_get_and_clear is used in common code (e.g. change_pte_range)
990 * to modify an active pte. The sequence is
991 * 1) ptep_get_and_clear
994 * On s390 the tlb needs to get flushed with the modification of the pte
995 * if the pte is active. The only way how this can be implemented is to
996 * have ptep_get_and_clear do the tlb flush. In exchange flush_tlb_range
999 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1000 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
1001 unsigned long address, pte_t *ptep)
1006 mm->context.flush_mm = 1;
1007 if (mm_has_pgste(mm))
1008 pgste = pgste_get_lock(ptep);
1011 if (!mm_exclusive(mm))
1012 __ptep_ipte(address, ptep);
1013 pte_val(*ptep) = _PAGE_TYPE_EMPTY;
1015 if (mm_has_pgste(mm)) {
1016 pgste = pgste_update_all(&pte, pgste);
1017 pgste_set_unlock(ptep, pgste);
1022 #define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
1023 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
1024 unsigned long address,
1029 mm->context.flush_mm = 1;
1030 if (mm_has_pgste(mm))
1031 pgste_get_lock(ptep);
1034 if (!mm_exclusive(mm))
1035 __ptep_ipte(address, ptep);
1039 static inline void ptep_modify_prot_commit(struct mm_struct *mm,
1040 unsigned long address,
1041 pte_t *ptep, pte_t pte)
1044 if (mm_has_pgste(mm))
1045 pgste_set_unlock(ptep, *(pgste_t *)(ptep + PTRS_PER_PTE));
1048 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH
1049 static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
1050 unsigned long address, pte_t *ptep)
1055 if (mm_has_pgste(vma->vm_mm))
1056 pgste = pgste_get_lock(ptep);
1059 __ptep_ipte(address, ptep);
1060 pte_val(*ptep) = _PAGE_TYPE_EMPTY;
1062 if (mm_has_pgste(vma->vm_mm)) {
1063 pgste = pgste_update_all(&pte, pgste);
1064 pgste_set_unlock(ptep, pgste);
1070 * The batched pte unmap code uses ptep_get_and_clear_full to clear the
1071 * ptes. Here an optimization is possible. tlb_gather_mmu flushes all
1072 * tlbs of an mm if it can guarantee that the ptes of the mm_struct
1073 * cannot be accessed while the batched unmap is running. In this case
1074 * full==1 and a simple pte_clear is enough. See tlb.h.
1076 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1077 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1078 unsigned long address,
1079 pte_t *ptep, int full)
1084 if (mm_has_pgste(mm))
1085 pgste = pgste_get_lock(ptep);
1089 __ptep_ipte(address, ptep);
1090 pte_val(*ptep) = _PAGE_TYPE_EMPTY;
1092 if (mm_has_pgste(mm)) {
1093 pgste = pgste_update_all(&pte, pgste);
1094 pgste_set_unlock(ptep, pgste);
1099 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1100 static inline pte_t ptep_set_wrprotect(struct mm_struct *mm,
1101 unsigned long address, pte_t *ptep)
1106 if (pte_write(pte)) {
1107 mm->context.flush_mm = 1;
1108 if (mm_has_pgste(mm))
1109 pgste = pgste_get_lock(ptep);
1111 if (!mm_exclusive(mm))
1112 __ptep_ipte(address, ptep);
1113 *ptep = pte_wrprotect(pte);
1115 if (mm_has_pgste(mm))
1116 pgste_set_unlock(ptep, pgste);
1121 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1122 static inline int ptep_set_access_flags(struct vm_area_struct *vma,
1123 unsigned long address, pte_t *ptep,
1124 pte_t entry, int dirty)
1128 if (pte_same(*ptep, entry))
1130 if (mm_has_pgste(vma->vm_mm))
1131 pgste = pgste_get_lock(ptep);
1133 __ptep_ipte(address, ptep);
1136 if (mm_has_pgste(vma->vm_mm))
1137 pgste_set_unlock(ptep, pgste);
1142 * Conversion functions: convert a page and protection to a page entry,
1143 * and a page entry and page directory to the page they refer to.
1145 static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
1148 pte_val(__pte) = physpage + pgprot_val(pgprot);
1152 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
1154 unsigned long physpage = page_to_phys(page);
1156 return mk_pte_phys(physpage, pgprot);
1159 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
1160 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
1161 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
1162 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
1164 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
1165 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
1167 #ifndef CONFIG_64BIT
1169 #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
1170 #define pud_deref(pmd) ({ BUG(); 0UL; })
1171 #define pgd_deref(pmd) ({ BUG(); 0UL; })
1173 #define pud_offset(pgd, address) ((pud_t *) pgd)
1174 #define pmd_offset(pud, address) ((pmd_t *) pud + pmd_index(address))
1176 #else /* CONFIG_64BIT */
1178 #define pmd_deref(pmd) (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN)
1179 #define pud_deref(pud) (pud_val(pud) & _REGION_ENTRY_ORIGIN)
1180 #define pgd_deref(pgd) (pgd_val(pgd) & _REGION_ENTRY_ORIGIN)
1182 static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
1184 pud_t *pud = (pud_t *) pgd;
1185 if ((pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R2)
1186 pud = (pud_t *) pgd_deref(*pgd);
1187 return pud + pud_index(address);
1190 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
1192 pmd_t *pmd = (pmd_t *) pud;
1193 if ((pud_val(*pud) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
1194 pmd = (pmd_t *) pud_deref(*pud);
1195 return pmd + pmd_index(address);
1198 #endif /* CONFIG_64BIT */
1200 #define pfn_pte(pfn,pgprot) mk_pte_phys(__pa((pfn) << PAGE_SHIFT),(pgprot))
1201 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
1202 #define pte_page(x) pfn_to_page(pte_pfn(x))
1204 #define pmd_page(pmd) pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
1206 /* Find an entry in the lowest level page table.. */
1207 #define pte_offset(pmd, addr) ((pte_t *) pmd_deref(*(pmd)) + pte_index(addr))
1208 #define pte_offset_kernel(pmd, address) pte_offset(pmd,address)
1209 #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
1210 #define pte_unmap(pte) do { } while (0)
1212 static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
1214 unsigned long sto = (unsigned long) pmdp -
1215 pmd_index(address) * sizeof(pmd_t);
1217 if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
1219 " .insn rrf,0xb98e0000,%2,%3,0,0"
1221 : "m" (*pmdp), "a" (sto),
1222 "a" ((address & HPAGE_MASK))
1228 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1230 #define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
1231 #define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
1232 #define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
1234 #define __HAVE_ARCH_PGTABLE_DEPOSIT
1235 extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
1237 #define __HAVE_ARCH_PGTABLE_WITHDRAW
1238 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm);
1240 static inline int pmd_trans_splitting(pmd_t pmd)
1242 return pmd_val(pmd) & _SEGMENT_ENTRY_SPLIT;
1245 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1246 pmd_t *pmdp, pmd_t entry)
1251 static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
1254 * pgprot is PAGE_NONE, PAGE_RO, or PAGE_RW (see __Pxxx / __Sxxx)
1255 * Convert to segment table entry format.
1257 if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))
1258 return pgprot_val(SEGMENT_NONE);
1259 if (pgprot_val(pgprot) == pgprot_val(PAGE_RO))
1260 return pgprot_val(SEGMENT_RO);
1261 return pgprot_val(SEGMENT_RW);
1264 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
1266 pmd_val(pmd) &= _SEGMENT_CHG_MASK;
1267 pmd_val(pmd) |= massage_pgprot_pmd(newprot);
1271 static inline pmd_t pmd_mkhuge(pmd_t pmd)
1273 pmd_val(pmd) |= _SEGMENT_ENTRY_LARGE;
1277 static inline pmd_t pmd_mkwrite(pmd_t pmd)
1279 /* Do not clobber _HPAGE_TYPE_NONE pages! */
1280 if (!(pmd_val(pmd) & _SEGMENT_ENTRY_INV))
1281 pmd_val(pmd) &= ~_SEGMENT_ENTRY_RO;
1285 static inline pmd_t pmd_wrprotect(pmd_t pmd)
1287 pmd_val(pmd) |= _SEGMENT_ENTRY_RO;
1291 static inline pmd_t pmd_mkdirty(pmd_t pmd)
1293 /* No dirty bit in the segment table entry. */
1297 static inline pmd_t pmd_mkold(pmd_t pmd)
1299 /* No referenced bit in the segment table entry. */
1303 static inline pmd_t pmd_mkyoung(pmd_t pmd)
1305 /* No referenced bit in the segment table entry. */
1309 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1310 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1311 unsigned long address, pmd_t *pmdp)
1313 unsigned long pmd_addr = pmd_val(*pmdp) & HPAGE_MASK;
1318 if (MACHINE_HAS_RRBM) {
1319 counter = PTRS_PER_PTE >> 6;
1321 "0: .insn rre,0xb9ae0000,%0,%3\n" /* rrbm */
1325 : "=&d" (tmp), "+&d" (rc), "+d" (counter),
1327 : "a" (64 * 4096UL) : "cc");
1330 counter = PTRS_PER_PTE;
1337 : "+d" (rc), "+d" (counter), "+a" (pmd_addr)
1338 : "a" (4096UL) : "cc");
1343 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
1344 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
1345 unsigned long address, pmd_t *pmdp)
1349 __pmd_idte(address, pmdp);
1354 #define __HAVE_ARCH_PMDP_CLEAR_FLUSH
1355 static inline pmd_t pmdp_clear_flush(struct vm_area_struct *vma,
1356 unsigned long address, pmd_t *pmdp)
1358 return pmdp_get_and_clear(vma->vm_mm, address, pmdp);
1361 #define __HAVE_ARCH_PMDP_INVALIDATE
1362 static inline void pmdp_invalidate(struct vm_area_struct *vma,
1363 unsigned long address, pmd_t *pmdp)
1365 __pmd_idte(address, pmdp);
1368 static inline pmd_t mk_pmd_phys(unsigned long physpage, pgprot_t pgprot)
1371 pmd_val(__pmd) = physpage + massage_pgprot_pmd(pgprot);
1375 #define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
1376 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1378 static inline int pmd_trans_huge(pmd_t pmd)
1380 return pmd_val(pmd) & _SEGMENT_ENTRY_LARGE;
1383 static inline int has_transparent_hugepage(void)
1385 return MACHINE_HAS_HPAGE ? 1 : 0;
1388 static inline unsigned long pmd_pfn(pmd_t pmd)
1390 if (pmd_trans_huge(pmd))
1391 return pmd_val(pmd) >> HPAGE_SHIFT;
1393 return pmd_val(pmd) >> PAGE_SHIFT;
1395 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1398 * 31 bit swap entry format:
1399 * A page-table entry has some bits we have to treat in a special way.
1400 * Bits 0, 20 and bit 23 have to be zero, otherwise an specification
1401 * exception will occur instead of a page translation exception. The
1402 * specifiation exception has the bad habit not to store necessary
1403 * information in the lowcore.
1404 * Bit 21 and bit 22 are the page invalid bit and the page protection
1405 * bit. We set both to indicate a swapped page.
1406 * Bit 30 and 31 are used to distinguish the different page types. For
1407 * a swapped page these bits need to be zero.
1408 * This leaves the bits 1-19 and bits 24-29 to store type and offset.
1409 * We use the 5 bits from 25-29 for the type and the 20 bits from 1-19
1410 * plus 24 for the offset.
1411 * 0| offset |0110|o|type |00|
1412 * 0 0000000001111111111 2222 2 22222 33
1413 * 0 1234567890123456789 0123 4 56789 01
1415 * 64 bit swap entry format:
1416 * A page-table entry has some bits we have to treat in a special way.
1417 * Bits 52 and bit 55 have to be zero, otherwise an specification
1418 * exception will occur instead of a page translation exception. The
1419 * specifiation exception has the bad habit not to store necessary
1420 * information in the lowcore.
1421 * Bit 53 and bit 54 are the page invalid bit and the page protection
1422 * bit. We set both to indicate a swapped page.
1423 * Bit 62 and 63 are used to distinguish the different page types. For
1424 * a swapped page these bits need to be zero.
1425 * This leaves the bits 0-51 and bits 56-61 to store type and offset.
1426 * We use the 5 bits from 57-61 for the type and the 53 bits from 0-51
1427 * plus 56 for the offset.
1428 * | offset |0110|o|type |00|
1429 * 0000000000111111111122222222223333333333444444444455 5555 5 55566 66
1430 * 0123456789012345678901234567890123456789012345678901 2345 6 78901 23
1432 #ifndef CONFIG_64BIT
1433 #define __SWP_OFFSET_MASK (~0UL >> 12)
1435 #define __SWP_OFFSET_MASK (~0UL >> 11)
1437 static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
1440 offset &= __SWP_OFFSET_MASK;
1441 pte_val(pte) = _PAGE_TYPE_SWAP | ((type & 0x1f) << 2) |
1442 ((offset & 1UL) << 7) | ((offset & ~1UL) << 11);
1446 #define __swp_type(entry) (((entry).val >> 2) & 0x1f)
1447 #define __swp_offset(entry) (((entry).val >> 11) | (((entry).val >> 7) & 1))
1448 #define __swp_entry(type,offset) ((swp_entry_t) { pte_val(mk_swap_pte((type),(offset))) })
1450 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
1451 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
1453 #ifndef CONFIG_64BIT
1454 # define PTE_FILE_MAX_BITS 26
1455 #else /* CONFIG_64BIT */
1456 # define PTE_FILE_MAX_BITS 59
1457 #endif /* CONFIG_64BIT */
1459 #define pte_to_pgoff(__pte) \
1460 ((((__pte).pte >> 12) << 7) + (((__pte).pte >> 1) & 0x7f))
1462 #define pgoff_to_pte(__off) \
1463 ((pte_t) { ((((__off) & 0x7f) << 1) + (((__off) >> 7) << 12)) \
1464 | _PAGE_TYPE_FILE })
1466 #endif /* !__ASSEMBLY__ */
1468 #define kern_addr_valid(addr) (1)
1470 extern int vmem_add_mapping(unsigned long start, unsigned long size);
1471 extern int vmem_remove_mapping(unsigned long start, unsigned long size);
1472 extern int s390_enable_sie(void);
1475 * No page table caches to initialise
1477 #define pgtable_cache_init() do { } while (0)
1479 #include <asm-generic/pgtable.h>
1481 #endif /* _S390_PAGE_H */