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1 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_H
2 #define _ASM_POWERPC_BOOK3S_64_HASH_H
6 * Common bits between 4K and 64K pages in a linux-style PTE.
7 * Additional bits may be defined in pgtable-hash64-*.h
9 * Note: We only support user read/write permissions. Supervisor always
10 * have full read/write to pages above PAGE_OFFSET (pages below that
11 * always use the user access permissions).
13 * We could create separate kernel read-only if we used the 3 PP bits
14 * combinations that newer processors provide but we currently don't.
16 #define _PAGE_PTE 0x00001 /* distinguishes PTEs from pointers */
17 #define _PAGE_BIT_SWAP_TYPE 2
18 #define _PAGE_USER 0x00004 /* page may be accessed by userspace */
19 #define _PAGE_EXEC 0x00008 /* execute permission */
20 #define _PAGE_GUARDED 0x00010 /* G: guarded (side-effect) page */
21 /* M (memory coherence) is always set in the HPTE, so we don't need it here */
22 #define _PAGE_COHERENT 0x0
23 #define _PAGE_NO_CACHE 0x00020 /* I: cache inhibit */
24 #define _PAGE_WRITETHRU 0x00040 /* W: cache write-through */
25 #define _PAGE_DIRTY 0x00080 /* C: page changed */
26 #define _PAGE_ACCESSED 0x00100 /* R: page referenced */
27 #define _PAGE_RW 0x00200 /* software: user write access allowed */
28 #define _PAGE_HASHPTE 0x00400 /* software: pte has an associated HPTE */
29 #define _PAGE_BUSY 0x00800 /* software: PTE & hash are busy */
30 #define _PAGE_F_GIX 0x07000 /* full page: hidx bits */
31 #define _PAGE_F_GIX_SHIFT 12
32 #define _PAGE_F_SECOND 0x08000 /* Whether to use secondary hash or not */
33 #define _PAGE_SPECIAL 0x10000 /* software: special page */
35 #ifdef CONFIG_MEM_SOFT_DIRTY
36 #define _PAGE_SOFT_DIRTY 0x20000 /* software: software dirty tracking */
38 #define _PAGE_SOFT_DIRTY 0x00000
41 #define _PAGE_PRESENT (1ul << 63) /* pte contains a translation */
44 * We need to differentiate between explicit huge page and THP huge
45 * page, since THP huge page also need to track real subpage details
47 #define _PAGE_THP_HUGE _PAGE_4K_PFN
50 * set of bits not changed in pmd_modify.
52 #define _HPAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
53 _PAGE_ACCESSED | _PAGE_THP_HUGE | _PAGE_PTE | \
57 #ifdef CONFIG_PPC_64K_PAGES
58 #include <asm/book3s/64/hash-64k.h>
60 #include <asm/book3s/64/hash-4k.h>
64 * Size of EA range mapped by our pagetables.
66 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
67 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
68 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
70 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
71 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
73 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
76 * Define the address range of the kernel non-linear virtual area
78 #define KERN_VIRT_START ASM_CONST(0xD000000000000000)
79 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
82 * The vmalloc space starts at the beginning of that region, and
83 * occupies half of it on hash CPUs and a quarter of it on Book3E
84 * (we keep a quarter for the virtual memmap)
86 #define VMALLOC_START KERN_VIRT_START
87 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
88 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
93 #define REGION_SHIFT 60UL
94 #define REGION_MASK (0xfUL << REGION_SHIFT)
95 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
97 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
98 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
99 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
100 #define USER_REGION_ID (0UL)
103 * Defines the address of the vmemap area, in its own region on
106 #define VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
108 #ifdef CONFIG_PPC_MM_SLICES
109 #define HAVE_ARCH_UNMAPPED_AREA
110 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
111 #endif /* CONFIG_PPC_MM_SLICES */
113 /* No separate kernel read-only */
114 #define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */
115 #define _PAGE_KERNEL_RO _PAGE_KERNEL_RW
116 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_EXEC)
118 /* Strong Access Ordering */
119 #define _PAGE_SAO (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT)
121 /* No page size encoding in the linux PTE */
122 #define _PAGE_PSIZE 0
125 #define _PTEIDX_SECONDARY 0x8
126 #define _PTEIDX_GROUP_IX 0x7
128 /* Hash table based platforms need atomic updates of the linux PTE */
129 #define PTE_ATOMIC_UPDATES 1
130 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS
132 * The mask convered by the RPN must be a ULL on 32-bit platforms with
135 #define PTE_RPN_MASK (((1UL << PTE_RPN_SIZE) - 1) << PTE_RPN_SHIFT)
137 * _PAGE_CHG_MASK masks of bits that are to be preserved across
140 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
141 _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
144 * Mask of bits returned by pte_pgprot()
146 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
147 _PAGE_WRITETHRU | _PAGE_4K_PFN | \
148 _PAGE_USER | _PAGE_ACCESSED | \
149 _PAGE_RW | _PAGE_DIRTY | _PAGE_EXEC | \
152 * We define 2 sets of base prot bits, one for basic pages (ie,
153 * cacheable kernel and user pages) and one for non cacheable
154 * pages. We always set _PAGE_COHERENT when SMP is enabled or
155 * the processor might need it for DMA coherency.
157 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
158 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
160 /* Permission masks used to generate the __P and __S table,
162 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
164 * Write permissions imply read permissions for now (we could make write-only
165 * pages on BookE but we don't bother for now). Execute permission control is
166 * possible on platforms that define _PAGE_EXEC
168 * Note due to the way vm flags are laid out, the bits are XWR
170 #define PAGE_NONE __pgprot(_PAGE_BASE)
171 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
172 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
174 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER )
175 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
176 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER )
177 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
179 #define __P000 PAGE_NONE
180 #define __P001 PAGE_READONLY
181 #define __P010 PAGE_COPY
182 #define __P011 PAGE_COPY
183 #define __P100 PAGE_READONLY_X
184 #define __P101 PAGE_READONLY_X
185 #define __P110 PAGE_COPY_X
186 #define __P111 PAGE_COPY_X
188 #define __S000 PAGE_NONE
189 #define __S001 PAGE_READONLY
190 #define __S010 PAGE_SHARED
191 #define __S011 PAGE_SHARED
192 #define __S100 PAGE_READONLY_X
193 #define __S101 PAGE_READONLY_X
194 #define __S110 PAGE_SHARED_X
195 #define __S111 PAGE_SHARED_X
197 /* Permission masks used for kernel mappings */
198 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
199 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
201 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
202 _PAGE_NO_CACHE | _PAGE_GUARDED)
203 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
204 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
205 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
207 /* Protection used for kernel text. We want the debuggers to be able to
208 * set breakpoints anywhere, so don't write protect the kernel text
209 * on platforms where such control is possible.
211 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
212 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
213 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
215 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
218 /* Make modules code happy. We don't set RO yet */
219 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
220 #define PAGE_AGP (PAGE_KERNEL_NC)
222 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
223 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
226 #define pmd_bad(pmd) (pmd_val(pmd) & PMD_BAD_BITS)
227 #define pmd_page_vaddr(pmd) __va(pmd_val(pmd) & ~PMD_MASKED_BITS)
229 #define pud_bad(pud) (pud_val(pud) & PUD_BAD_BITS)
230 #define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS)
232 /* Pointers in the page table tree are physical addresses */
233 #define __pgtable_ptr_val(ptr) __pa(ptr)
235 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
236 #define pmd_index(address) (((address) >> (PMD_SHIFT)) & (PTRS_PER_PMD - 1))
237 #define pte_index(address) (((address) >> (PAGE_SHIFT)) & (PTRS_PER_PTE - 1))
239 extern void hpte_need_flush(struct mm_struct
*mm
, unsigned long addr
,
240 pte_t
*ptep
, unsigned long pte
, int huge
);
241 extern unsigned long htab_convert_pte_flags(unsigned long pteflags
);
242 /* Atomic PTE updates */
243 static inline unsigned long pte_update(struct mm_struct
*mm
,
245 pte_t
*ptep
, unsigned long clr
,
249 unsigned long old
, tmp
;
251 __asm__
__volatile__(
252 "1: ldarx %0,0,%3 # pte_update\n\
259 : "=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
260 : "r" (ptep
), "r" (clr
), "m" (*ptep
), "i" (_PAGE_BUSY
), "r" (set
)
262 /* huge pages use the old page table lock */
264 assert_pte_locked(mm
, addr
);
266 if (old
& _PAGE_HASHPTE
)
267 hpte_need_flush(mm
, addr
, ptep
, old
, huge
);
272 static inline int __ptep_test_and_clear_young(struct mm_struct
*mm
,
273 unsigned long addr
, pte_t
*ptep
)
277 if ((pte_val(*ptep
) & (_PAGE_ACCESSED
| _PAGE_HASHPTE
)) == 0)
279 old
= pte_update(mm
, addr
, ptep
, _PAGE_ACCESSED
, 0, 0);
280 return (old
& _PAGE_ACCESSED
) != 0;
282 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
283 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
286 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
290 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
291 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
,
295 if ((pte_val(*ptep
) & _PAGE_RW
) == 0)
298 pte_update(mm
, addr
, ptep
, _PAGE_RW
, 0, 0);
301 static inline void huge_ptep_set_wrprotect(struct mm_struct
*mm
,
302 unsigned long addr
, pte_t
*ptep
)
304 if ((pte_val(*ptep
) & _PAGE_RW
) == 0)
307 pte_update(mm
, addr
, ptep
, _PAGE_RW
, 0, 1);
311 * We currently remove entries from the hashtable regardless of whether
312 * the entry was young or dirty. The generic routines only flush if the
313 * entry was young or dirty which is not good enough.
315 * We should be more intelligent about this but for the moment we override
316 * these functions and force a tlb flush unconditionally
318 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
319 #define ptep_clear_flush_young(__vma, __address, __ptep) \
321 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
326 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
327 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
,
328 unsigned long addr
, pte_t
*ptep
)
330 unsigned long old
= pte_update(mm
, addr
, ptep
, ~0UL, 0, 0);
334 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
,
337 pte_update(mm
, addr
, ptep
, ~0UL, 0, 0);
341 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
342 * function doesn't need to flush the hash entry
344 static inline void __ptep_set_access_flags(pte_t
*ptep
, pte_t entry
)
346 unsigned long bits
= pte_val(entry
) &
347 (_PAGE_DIRTY
| _PAGE_ACCESSED
| _PAGE_RW
| _PAGE_EXEC
|
350 unsigned long old
, tmp
;
352 __asm__
__volatile__(
359 :"=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
360 :"r" (bits
), "r" (ptep
), "m" (*ptep
), "i" (_PAGE_BUSY
)
364 #define __HAVE_ARCH_PTE_SAME
365 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
367 /* Generic accessors to PTE bits */
368 static inline int pte_write(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_RW
);}
369 static inline int pte_dirty(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_DIRTY
); }
370 static inline int pte_young(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_ACCESSED
); }
371 static inline int pte_special(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_SPECIAL
); }
372 static inline int pte_none(pte_t pte
) { return (pte_val(pte
) & ~_PTE_NONE_MASK
) == 0; }
373 static inline pgprot_t
pte_pgprot(pte_t pte
) { return __pgprot(pte_val(pte
) & PAGE_PROT_BITS
); }
375 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
376 static inline bool pte_soft_dirty(pte_t pte
)
378 return !!(pte_val(pte
) & _PAGE_SOFT_DIRTY
);
380 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
382 return __pte(pte_val(pte
) | _PAGE_SOFT_DIRTY
);
385 static inline pte_t
pte_clear_soft_dirty(pte_t pte
)
387 return __pte(pte_val(pte
) & ~_PAGE_SOFT_DIRTY
);
389 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
391 #ifdef CONFIG_NUMA_BALANCING
393 * These work without NUMA balancing but the kernel does not care. See the
394 * comment in include/asm-generic/pgtable.h . On powerpc, this will only
395 * work for user pages and always return true for kernel pages.
397 static inline int pte_protnone(pte_t pte
)
399 return (pte_val(pte
) &
400 (_PAGE_PRESENT
| _PAGE_USER
)) == _PAGE_PRESENT
;
402 #endif /* CONFIG_NUMA_BALANCING */
404 static inline int pte_present(pte_t pte
)
406 return !!(pte_val(pte
) & _PAGE_PRESENT
);
409 /* Conversion functions: convert a page and protection to a page entry,
410 * and a page entry and page directory to the page they refer to.
412 * Even if PTEs can be unsigned long long, a PFN is always an unsigned
415 static inline pte_t
pfn_pte(unsigned long pfn
, pgprot_t pgprot
)
417 return __pte((((pte_basic_t
)(pfn
) << PTE_RPN_SHIFT
) & PTE_RPN_MASK
) |
421 static inline unsigned long pte_pfn(pte_t pte
)
423 return (pte_val(pte
) & PTE_RPN_MASK
) >> PTE_RPN_SHIFT
;
426 /* Generic modifiers for PTE bits */
427 static inline pte_t
pte_wrprotect(pte_t pte
)
429 return __pte(pte_val(pte
) & ~_PAGE_RW
);
432 static inline pte_t
pte_mkclean(pte_t pte
)
434 return __pte(pte_val(pte
) & ~_PAGE_DIRTY
);
437 static inline pte_t
pte_mkold(pte_t pte
)
439 return __pte(pte_val(pte
) & ~_PAGE_ACCESSED
);
442 static inline pte_t
pte_mkwrite(pte_t pte
)
444 return __pte(pte_val(pte
) | _PAGE_RW
);
447 static inline pte_t
pte_mkdirty(pte_t pte
)
449 return __pte(pte_val(pte
) | _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
452 static inline pte_t
pte_mkyoung(pte_t pte
)
454 return __pte(pte_val(pte
) | _PAGE_ACCESSED
);
457 static inline pte_t
pte_mkspecial(pte_t pte
)
459 return __pte(pte_val(pte
) | _PAGE_SPECIAL
);
462 static inline pte_t
pte_mkhuge(pte_t pte
)
467 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
469 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
472 /* This low level function performs the actual PTE insertion
473 * Setting the PTE depends on the MMU type and other factors. It's
474 * an horrible mess that I'm not going to try to clean up now but
475 * I'm keeping it in one place rather than spread around
477 static inline void __set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
478 pte_t
*ptep
, pte_t pte
, int percpu
)
481 * Anything else just stores the PTE normally. That covers all 64-bit
482 * cases, and 32-bit non-hash with 32-bit PTEs.
488 * Macro to mark a page protection value as "uncacheable".
491 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \
494 #define pgprot_noncached pgprot_noncached
495 static inline pgprot_t
pgprot_noncached(pgprot_t prot
)
497 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
498 _PAGE_NO_CACHE
| _PAGE_GUARDED
);
501 #define pgprot_noncached_wc pgprot_noncached_wc
502 static inline pgprot_t
pgprot_noncached_wc(pgprot_t prot
)
504 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
508 #define pgprot_cached pgprot_cached
509 static inline pgprot_t
pgprot_cached(pgprot_t prot
)
511 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
515 #define pgprot_cached_wthru pgprot_cached_wthru
516 static inline pgprot_t
pgprot_cached_wthru(pgprot_t prot
)
518 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
519 _PAGE_COHERENT
| _PAGE_WRITETHRU
);
522 #define pgprot_cached_noncoherent pgprot_cached_noncoherent
523 static inline pgprot_t
pgprot_cached_noncoherent(pgprot_t prot
)
525 return __pgprot(pgprot_val(prot
) & ~_PAGE_CACHE_CTL
);
528 #define pgprot_writecombine pgprot_writecombine
529 static inline pgprot_t
pgprot_writecombine(pgprot_t prot
)
531 return pgprot_noncached_wc(prot
);
534 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
535 extern void hpte_do_hugepage_flush(struct mm_struct
*mm
, unsigned long addr
,
536 pmd_t
*pmdp
, unsigned long old_pmd
);
538 static inline void hpte_do_hugepage_flush(struct mm_struct
*mm
,
539 unsigned long addr
, pmd_t
*pmdp
,
540 unsigned long old_pmd
)
542 WARN(1, "%s called with THP disabled\n", __func__
);
544 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
546 #endif /* !__ASSEMBLY__ */
547 #endif /* __KERNEL__ */
548 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */