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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 * These match the bits in the (hardware-defined) PowerPC PTE as closely
8 * as possible. Additional bits may be defined in pgtable-hash64-*.h
10 * Note: We only support user read/write permissions. Supervisor always
11 * have full read/write to pages above PAGE_OFFSET (pages below that
12 * always use the user access permissions).
14 * We could create separate kernel read-only if we used the 3 PP bits
15 * combinations that newer processors provide but we currently don't.
17 #define _PAGE_PTE 0x00001
18 #define _PAGE_PRESENT 0x00002 /* software: pte contains a translation */
19 #define _PAGE_BIT_SWAP_TYPE 2
20 #define _PAGE_USER 0x00004 /* matches one of the PP bits */
21 #define _PAGE_EXEC 0x00008 /* No execute on POWER4 and newer (we invert) */
22 #define _PAGE_GUARDED 0x00010
23 /* We can derive Memory coherence from _PAGE_NO_CACHE */
24 #define _PAGE_COHERENT 0x0
25 #define _PAGE_NO_CACHE 0x00020 /* I: cache inhibit */
26 #define _PAGE_WRITETHRU 0x00040 /* W: cache write-through */
27 #define _PAGE_DIRTY 0x00080 /* C: page changed */
28 #define _PAGE_ACCESSED 0x00100 /* R: page referenced */
29 #define _PAGE_RW 0x00200 /* software: user write access allowed */
30 #define _PAGE_HASHPTE 0x00400 /* software: pte has an associated HPTE */
31 #define _PAGE_BUSY 0x00800 /* software: PTE & hash are busy */
32 #define _PAGE_F_GIX 0x07000 /* full page: hidx bits */
33 #define _PAGE_F_GIX_SHIFT 12
34 #define _PAGE_F_SECOND 0x08000 /* Whether to use secondary hash or not */
35 #define _PAGE_SPECIAL 0x10000 /* software: special page */
37 #ifdef CONFIG_MEM_SOFT_DIRTY
38 #define _PAGE_SOFT_DIRTY 0x20000 /* software: software dirty tracking */
40 #define _PAGE_SOFT_DIRTY 0x00000
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)
55 #ifdef CONFIG_PPC_64K_PAGES
56 #include <asm/book3s/64/hash-64k.h>
58 #include <asm/book3s/64/hash-4k.h>
62 * Size of EA range mapped by our pagetables.
64 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
65 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
66 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
68 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
69 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
71 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
74 * Define the address range of the kernel non-linear virtual area
76 #define KERN_VIRT_START ASM_CONST(0xD000000000000000)
77 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
80 * The vmalloc space starts at the beginning of that region, and
81 * occupies half of it on hash CPUs and a quarter of it on Book3E
82 * (we keep a quarter for the virtual memmap)
84 #define VMALLOC_START KERN_VIRT_START
85 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
86 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
91 #define REGION_SHIFT 60UL
92 #define REGION_MASK (0xfUL << REGION_SHIFT)
93 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
95 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
96 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
97 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
98 #define USER_REGION_ID (0UL)
101 * Defines the address of the vmemap area, in its own region on
104 #define VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
106 #ifdef CONFIG_PPC_MM_SLICES
107 #define HAVE_ARCH_UNMAPPED_AREA
108 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
109 #endif /* CONFIG_PPC_MM_SLICES */
111 /* No separate kernel read-only */
112 #define _PAGE_KERNEL_RW (_PAGE_RW | _PAGE_DIRTY) /* user access blocked by key */
113 #define _PAGE_KERNEL_RO _PAGE_KERNEL_RW
114 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_EXEC)
116 /* Strong Access Ordering */
117 #define _PAGE_SAO (_PAGE_WRITETHRU | _PAGE_NO_CACHE | _PAGE_COHERENT)
119 /* No page size encoding in the linux PTE */
120 #define _PAGE_PSIZE 0
123 #define _PTEIDX_SECONDARY 0x8
124 #define _PTEIDX_GROUP_IX 0x7
126 /* Hash table based platforms need atomic updates of the linux PTE */
127 #define PTE_ATOMIC_UPDATES 1
128 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS
130 * The mask convered by the RPN must be a ULL on 32-bit platforms with
133 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
135 * _PAGE_CHG_MASK masks of bits that are to be preserved across
138 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
139 _PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
142 * Mask of bits returned by pte_pgprot()
144 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
145 _PAGE_WRITETHRU | _PAGE_4K_PFN | \
146 _PAGE_USER | _PAGE_ACCESSED | \
147 _PAGE_RW | _PAGE_DIRTY | _PAGE_EXEC | \
150 * We define 2 sets of base prot bits, one for basic pages (ie,
151 * cacheable kernel and user pages) and one for non cacheable
152 * pages. We always set _PAGE_COHERENT when SMP is enabled or
153 * the processor might need it for DMA coherency.
155 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
156 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
158 /* Permission masks used to generate the __P and __S table,
160 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
162 * Write permissions imply read permissions for now (we could make write-only
163 * pages on BookE but we don't bother for now). Execute permission control is
164 * possible on platforms that define _PAGE_EXEC
166 * Note due to the way vm flags are laid out, the bits are XWR
168 #define PAGE_NONE __pgprot(_PAGE_BASE)
169 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
170 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
172 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER )
173 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
174 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER )
175 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
177 #define __P000 PAGE_NONE
178 #define __P001 PAGE_READONLY
179 #define __P010 PAGE_COPY
180 #define __P011 PAGE_COPY
181 #define __P100 PAGE_READONLY_X
182 #define __P101 PAGE_READONLY_X
183 #define __P110 PAGE_COPY_X
184 #define __P111 PAGE_COPY_X
186 #define __S000 PAGE_NONE
187 #define __S001 PAGE_READONLY
188 #define __S010 PAGE_SHARED
189 #define __S011 PAGE_SHARED
190 #define __S100 PAGE_READONLY_X
191 #define __S101 PAGE_READONLY_X
192 #define __S110 PAGE_SHARED_X
193 #define __S111 PAGE_SHARED_X
195 /* Permission masks used for kernel mappings */
196 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
197 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
199 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
200 _PAGE_NO_CACHE | _PAGE_GUARDED)
201 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
202 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
203 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
205 /* Protection used for kernel text. We want the debuggers to be able to
206 * set breakpoints anywhere, so don't write protect the kernel text
207 * on platforms where such control is possible.
209 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
210 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
211 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
213 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
216 /* Make modules code happy. We don't set RO yet */
217 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
218 #define PAGE_AGP (PAGE_KERNEL_NC)
220 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
221 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
224 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
225 || (pmd_val(pmd) & PMD_BAD_BITS))
226 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
228 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
229 || (pud_val(pud) & PUD_BAD_BITS))
230 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
232 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
233 #define pmd_index(address) (((address) >> (PMD_SHIFT)) & (PTRS_PER_PMD - 1))
234 #define pte_index(address) (((address) >> (PAGE_SHIFT)) & (PTRS_PER_PTE - 1))
236 extern void hpte_need_flush(struct mm_struct
*mm
, unsigned long addr
,
237 pte_t
*ptep
, unsigned long pte
, int huge
);
238 extern unsigned long htab_convert_pte_flags(unsigned long pteflags
);
239 /* Atomic PTE updates */
240 static inline unsigned long pte_update(struct mm_struct
*mm
,
242 pte_t
*ptep
, unsigned long clr
,
246 unsigned long old
, tmp
;
248 __asm__
__volatile__(
249 "1: ldarx %0,0,%3 # pte_update\n\
256 : "=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
257 : "r" (ptep
), "r" (clr
), "m" (*ptep
), "i" (_PAGE_BUSY
), "r" (set
)
259 /* huge pages use the old page table lock */
261 assert_pte_locked(mm
, addr
);
263 if (old
& _PAGE_HASHPTE
)
264 hpte_need_flush(mm
, addr
, ptep
, old
, huge
);
269 static inline int __ptep_test_and_clear_young(struct mm_struct
*mm
,
270 unsigned long addr
, pte_t
*ptep
)
274 if ((pte_val(*ptep
) & (_PAGE_ACCESSED
| _PAGE_HASHPTE
)) == 0)
276 old
= pte_update(mm
, addr
, ptep
, _PAGE_ACCESSED
, 0, 0);
277 return (old
& _PAGE_ACCESSED
) != 0;
279 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
280 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
283 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
287 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
288 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
,
292 if ((pte_val(*ptep
) & _PAGE_RW
) == 0)
295 pte_update(mm
, addr
, ptep
, _PAGE_RW
, 0, 0);
298 static inline void huge_ptep_set_wrprotect(struct mm_struct
*mm
,
299 unsigned long addr
, pte_t
*ptep
)
301 if ((pte_val(*ptep
) & _PAGE_RW
) == 0)
304 pte_update(mm
, addr
, ptep
, _PAGE_RW
, 0, 1);
308 * We currently remove entries from the hashtable regardless of whether
309 * the entry was young or dirty. The generic routines only flush if the
310 * entry was young or dirty which is not good enough.
312 * We should be more intelligent about this but for the moment we override
313 * these functions and force a tlb flush unconditionally
315 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
316 #define ptep_clear_flush_young(__vma, __address, __ptep) \
318 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
323 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
324 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
,
325 unsigned long addr
, pte_t
*ptep
)
327 unsigned long old
= pte_update(mm
, addr
, ptep
, ~0UL, 0, 0);
331 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
,
334 pte_update(mm
, addr
, ptep
, ~0UL, 0, 0);
338 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
339 * function doesn't need to flush the hash entry
341 static inline void __ptep_set_access_flags(pte_t
*ptep
, pte_t entry
)
343 unsigned long bits
= pte_val(entry
) &
344 (_PAGE_DIRTY
| _PAGE_ACCESSED
| _PAGE_RW
| _PAGE_EXEC
|
347 unsigned long old
, tmp
;
349 __asm__
__volatile__(
356 :"=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
357 :"r" (bits
), "r" (ptep
), "m" (*ptep
), "i" (_PAGE_BUSY
)
361 #define __HAVE_ARCH_PTE_SAME
362 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
364 /* Generic accessors to PTE bits */
365 static inline int pte_write(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_RW
);}
366 static inline int pte_dirty(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_DIRTY
); }
367 static inline int pte_young(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_ACCESSED
); }
368 static inline int pte_special(pte_t pte
) { return !!(pte_val(pte
) & _PAGE_SPECIAL
); }
369 static inline int pte_none(pte_t pte
) { return (pte_val(pte
) & ~_PTE_NONE_MASK
) == 0; }
370 static inline pgprot_t
pte_pgprot(pte_t pte
) { return __pgprot(pte_val(pte
) & PAGE_PROT_BITS
); }
372 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
373 static inline bool pte_soft_dirty(pte_t pte
)
375 return !!(pte_val(pte
) & _PAGE_SOFT_DIRTY
);
377 static inline pte_t
pte_mksoft_dirty(pte_t pte
)
379 return __pte(pte_val(pte
) | _PAGE_SOFT_DIRTY
);
382 static inline pte_t
pte_clear_soft_dirty(pte_t pte
)
384 return __pte(pte_val(pte
) & ~_PAGE_SOFT_DIRTY
);
386 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
388 #ifdef CONFIG_NUMA_BALANCING
390 * These work without NUMA balancing but the kernel does not care. See the
391 * comment in include/asm-generic/pgtable.h . On powerpc, this will only
392 * work for user pages and always return true for kernel pages.
394 static inline int pte_protnone(pte_t pte
)
396 return (pte_val(pte
) &
397 (_PAGE_PRESENT
| _PAGE_USER
)) == _PAGE_PRESENT
;
399 #endif /* CONFIG_NUMA_BALANCING */
401 static inline int pte_present(pte_t pte
)
403 return pte_val(pte
) & _PAGE_PRESENT
;
406 /* Conversion functions: convert a page and protection to a page entry,
407 * and a page entry and page directory to the page they refer to.
409 * Even if PTEs can be unsigned long long, a PFN is always an unsigned
412 static inline pte_t
pfn_pte(unsigned long pfn
, pgprot_t pgprot
)
414 return __pte(((pte_basic_t
)(pfn
) << PTE_RPN_SHIFT
) |
418 static inline unsigned long pte_pfn(pte_t pte
)
420 return pte_val(pte
) >> PTE_RPN_SHIFT
;
423 /* Generic modifiers for PTE bits */
424 static inline pte_t
pte_wrprotect(pte_t pte
)
426 return __pte(pte_val(pte
) & ~_PAGE_RW
);
429 static inline pte_t
pte_mkclean(pte_t pte
)
431 return __pte(pte_val(pte
) & ~_PAGE_DIRTY
);
434 static inline pte_t
pte_mkold(pte_t pte
)
436 return __pte(pte_val(pte
) & ~_PAGE_ACCESSED
);
439 static inline pte_t
pte_mkwrite(pte_t pte
)
441 return __pte(pte_val(pte
) | _PAGE_RW
);
444 static inline pte_t
pte_mkdirty(pte_t pte
)
446 return __pte(pte_val(pte
) | _PAGE_DIRTY
| _PAGE_SOFT_DIRTY
);
449 static inline pte_t
pte_mkyoung(pte_t pte
)
451 return __pte(pte_val(pte
) | _PAGE_ACCESSED
);
454 static inline pte_t
pte_mkspecial(pte_t pte
)
456 return __pte(pte_val(pte
) | _PAGE_SPECIAL
);
459 static inline pte_t
pte_mkhuge(pte_t pte
)
464 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
466 return __pte((pte_val(pte
) & _PAGE_CHG_MASK
) | pgprot_val(newprot
));
469 /* This low level function performs the actual PTE insertion
470 * Setting the PTE depends on the MMU type and other factors. It's
471 * an horrible mess that I'm not going to try to clean up now but
472 * I'm keeping it in one place rather than spread around
474 static inline void __set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
475 pte_t
*ptep
, pte_t pte
, int percpu
)
478 * Anything else just stores the PTE normally. That covers all 64-bit
479 * cases, and 32-bit non-hash with 32-bit PTEs.
485 * Macro to mark a page protection value as "uncacheable".
488 #define _PAGE_CACHE_CTL (_PAGE_COHERENT | _PAGE_GUARDED | _PAGE_NO_CACHE | \
491 #define pgprot_noncached pgprot_noncached
492 static inline pgprot_t
pgprot_noncached(pgprot_t prot
)
494 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
495 _PAGE_NO_CACHE
| _PAGE_GUARDED
);
498 #define pgprot_noncached_wc pgprot_noncached_wc
499 static inline pgprot_t
pgprot_noncached_wc(pgprot_t prot
)
501 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
505 #define pgprot_cached pgprot_cached
506 static inline pgprot_t
pgprot_cached(pgprot_t prot
)
508 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
512 #define pgprot_cached_wthru pgprot_cached_wthru
513 static inline pgprot_t
pgprot_cached_wthru(pgprot_t prot
)
515 return __pgprot((pgprot_val(prot
) & ~_PAGE_CACHE_CTL
) |
516 _PAGE_COHERENT
| _PAGE_WRITETHRU
);
519 #define pgprot_cached_noncoherent pgprot_cached_noncoherent
520 static inline pgprot_t
pgprot_cached_noncoherent(pgprot_t prot
)
522 return __pgprot(pgprot_val(prot
) & ~_PAGE_CACHE_CTL
);
525 #define pgprot_writecombine pgprot_writecombine
526 static inline pgprot_t
pgprot_writecombine(pgprot_t prot
)
528 return pgprot_noncached_wc(prot
);
531 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
532 extern void hpte_do_hugepage_flush(struct mm_struct
*mm
, unsigned long addr
,
533 pmd_t
*pmdp
, unsigned long old_pmd
);
535 static inline void hpte_do_hugepage_flush(struct mm_struct
*mm
,
536 unsigned long addr
, pmd_t
*pmdp
,
537 unsigned long old_pmd
)
539 WARN(1, "%s called with THP disabled\n", __func__
);
541 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
543 #endif /* !__ASSEMBLY__ */
544 #endif /* __KERNEL__ */
545 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */