1 #ifndef _PPC64_PGTABLE_H
2 #define _PPC64_PGTABLE_H
5 * This file contains the functions and defines necessary to modify and use
6 * the ppc64 hashed page table.
10 #include <linux/config.h>
11 #include <linux/stddef.h>
12 #include <asm/processor.h> /* For TASK_SIZE */
15 #include <asm/tlbflush.h>
16 #endif /* __ASSEMBLY__ */
19 * Entries per page directory level. The PTE level must use a 64b record
20 * for each page table entry. The PMD and PGD level use a 32b record for
21 * each entry by assuming that each entry is page aligned.
23 #define PTE_INDEX_SIZE 9
24 #define PMD_INDEX_SIZE 7
25 #define PUD_INDEX_SIZE 7
26 #define PGD_INDEX_SIZE 9
28 #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
29 #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
30 #define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE)
31 #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
33 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
34 #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
35 #define PTRS_PER_PUD (1 << PMD_INDEX_SIZE)
36 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
38 /* PMD_SHIFT determines what a second-level page table entry can map */
39 #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
40 #define PMD_SIZE (1UL << PMD_SHIFT)
41 #define PMD_MASK (~(PMD_SIZE-1))
43 /* PUD_SHIFT determines what a third-level page table entry can map */
44 #define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
45 #define PUD_SIZE (1UL << PUD_SHIFT)
46 #define PUD_MASK (~(PUD_SIZE-1))
48 /* PGDIR_SHIFT determines what a fourth-level page table entry can map */
49 #define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE)
50 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
51 #define PGDIR_MASK (~(PGDIR_SIZE-1))
53 #define FIRST_USER_ADDRESS 0
56 * Size of EA range mapped by our pagetables.
58 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
59 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
60 #define PGTABLE_RANGE (1UL << PGTABLE_EADDR_SIZE)
62 #if TASK_SIZE_USER64 > PGTABLE_RANGE
63 #error TASK_SIZE_USER64 exceeds pagetable range
66 #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT))
67 #error TASK_SIZE_USER64 exceeds user VSID range
71 * Define the address range of the vmalloc VM area.
73 #define VMALLOC_START (0xD000000000000000ul)
74 #define VMALLOC_SIZE (0x80000000000UL)
75 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
78 * Bits in a linux-style PTE. These match the bits in the
79 * (hardware-defined) PowerPC PTE as closely as possible.
81 #define _PAGE_PRESENT 0x0001 /* software: pte contains a translation */
82 #define _PAGE_USER 0x0002 /* matches one of the PP bits */
83 #define _PAGE_FILE 0x0002 /* (!present only) software: pte holds file offset */
84 #define _PAGE_EXEC 0x0004 /* No execute on POWER4 and newer (we invert) */
85 #define _PAGE_GUARDED 0x0008
86 #define _PAGE_COHERENT 0x0010 /* M: enforce memory coherence (SMP systems) */
87 #define _PAGE_NO_CACHE 0x0020 /* I: cache inhibit */
88 #define _PAGE_WRITETHRU 0x0040 /* W: cache write-through */
89 #define _PAGE_DIRTY 0x0080 /* C: page changed */
90 #define _PAGE_ACCESSED 0x0100 /* R: page referenced */
91 #define _PAGE_RW 0x0200 /* software: user write access allowed */
92 #define _PAGE_HASHPTE 0x0400 /* software: pte has an associated HPTE */
93 #define _PAGE_BUSY 0x0800 /* software: PTE & hash are busy */
94 #define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
95 #define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */
96 #define _PAGE_HUGE 0x10000 /* 16MB page */
97 /* Bits 0x7000 identify the index within an HPT Group */
98 #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_SECONDARY | _PAGE_GROUP_IX)
99 /* PAGE_MASK gives the right answer below, but only by accident */
100 /* It should be preserving the high 48 bits and then specifically */
101 /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
102 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
104 #define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
106 #define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY)
108 /* __pgprot defined in asm-ppc64/page.h */
109 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
111 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
112 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
113 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
114 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
115 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
116 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
117 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_WRENABLE)
118 #define PAGE_KERNEL_CI __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
119 _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
120 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
122 #define PAGE_AGP __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
123 #define HAVE_PAGE_AGP
126 * This bit in a hardware PTE indicates that the page is *not* executable.
128 #define HW_NO_EXEC _PAGE_EXEC
131 * POWER4 and newer have per page execute protection, older chips can only
132 * do this on a segment (256MB) basis.
134 * Also, write permissions imply read permissions.
135 * This is the closest we can get..
137 * Note due to the way vm flags are laid out, the bits are XWR
139 #define __P000 PAGE_NONE
140 #define __P001 PAGE_READONLY
141 #define __P010 PAGE_COPY
142 #define __P011 PAGE_COPY
143 #define __P100 PAGE_READONLY_X
144 #define __P101 PAGE_READONLY_X
145 #define __P110 PAGE_COPY_X
146 #define __P111 PAGE_COPY_X
148 #define __S000 PAGE_NONE
149 #define __S001 PAGE_READONLY
150 #define __S010 PAGE_SHARED
151 #define __S011 PAGE_SHARED
152 #define __S100 PAGE_READONLY_X
153 #define __S101 PAGE_READONLY_X
154 #define __S110 PAGE_SHARED_X
155 #define __S111 PAGE_SHARED_X
160 * ZERO_PAGE is a global shared page that is always zero: used
161 * for zero-mapped memory areas etc..
163 extern unsigned long empty_zero_page
[PAGE_SIZE
/sizeof(unsigned long)];
164 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
165 #endif /* __ASSEMBLY__ */
167 /* shift to put page number into pte */
168 #define PTE_SHIFT (17)
170 #ifdef CONFIG_HUGETLB_PAGE
173 int hash_huge_page(struct mm_struct
*mm
, unsigned long access
,
174 unsigned long ea
, unsigned long vsid
, int local
);
175 #endif /* __ASSEMBLY__ */
177 #define HAVE_ARCH_UNMAPPED_AREA
178 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
181 #define hash_huge_page(mm,a,ea,vsid,local) -1
188 * Conversion functions: convert a page and protection to a page entry,
189 * and a page entry and page directory to the page they refer to.
191 * mk_pte takes a (struct page *) as input
193 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
195 static inline pte_t
pfn_pte(unsigned long pfn
, pgprot_t pgprot
)
200 pte_val(pte
) = (pfn
<< PTE_SHIFT
) | pgprot_val(pgprot
);
204 #define pte_modify(_pte, newprot) \
205 (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
207 #define pte_none(pte) ((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
208 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
210 /* pte_clear moved to later in this file */
212 #define pte_pfn(x) ((unsigned long)((pte_val(x) >> PTE_SHIFT)))
213 #define pte_page(x) pfn_to_page(pte_pfn(x))
215 #define pmd_set(pmdp, ptep) ({BUG_ON((u64)ptep < KERNELBASE); pmd_val(*(pmdp)) = (unsigned long)(ptep);})
216 #define pmd_none(pmd) (!pmd_val(pmd))
217 #define pmd_bad(pmd) (pmd_val(pmd) == 0)
218 #define pmd_present(pmd) (pmd_val(pmd) != 0)
219 #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0)
220 #define pmd_page_kernel(pmd) (pmd_val(pmd))
221 #define pmd_page(pmd) virt_to_page(pmd_page_kernel(pmd))
223 #define pud_set(pudp, pmdp) (pud_val(*(pudp)) = (unsigned long)(pmdp))
224 #define pud_none(pud) (!pud_val(pud))
225 #define pud_bad(pud) ((pud_val(pud)) == 0)
226 #define pud_present(pud) (pud_val(pud) != 0)
227 #define pud_clear(pudp) (pud_val(*(pudp)) = 0)
228 #define pud_page(pud) (pud_val(pud))
230 #define pgd_set(pgdp, pudp) ({pgd_val(*(pgdp)) = (unsigned long)(pudp);})
231 #define pgd_none(pgd) (!pgd_val(pgd))
232 #define pgd_bad(pgd) (pgd_val(pgd) == 0)
233 #define pgd_present(pgd) (pgd_val(pgd) != 0)
234 #define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0)
235 #define pgd_page(pgd) (pgd_val(pgd))
238 * Find an entry in a page-table-directory. We combine the address region
239 * (the high order N bits) and the pgd portion of the address.
241 /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
242 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff)
244 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
246 #define pud_offset(pgdp, addr) \
247 (((pud_t *) pgd_page(*(pgdp))) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
249 #define pmd_offset(pudp,addr) \
250 (((pmd_t *) pud_page(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
252 #define pte_offset_kernel(dir,addr) \
253 (((pte_t *) pmd_page_kernel(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
255 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
256 #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
257 #define pte_unmap(pte) do { } while(0)
258 #define pte_unmap_nested(pte) do { } while(0)
260 /* to find an entry in a kernel page-table-directory */
261 /* This now only contains the vmalloc pages */
262 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
265 * The following only work if pte_present() is true.
266 * Undefined behaviour if not..
268 static inline int pte_read(pte_t pte
) { return pte_val(pte
) & _PAGE_USER
;}
269 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_RW
;}
270 static inline int pte_exec(pte_t pte
) { return pte_val(pte
) & _PAGE_EXEC
;}
271 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_DIRTY
;}
272 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
;}
273 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
;}
274 static inline int pte_huge(pte_t pte
) { return pte_val(pte
) & _PAGE_HUGE
;}
276 static inline void pte_uncache(pte_t pte
) { pte_val(pte
) |= _PAGE_NO_CACHE
; }
277 static inline void pte_cache(pte_t pte
) { pte_val(pte
) &= ~_PAGE_NO_CACHE
; }
279 static inline pte_t
pte_rdprotect(pte_t pte
) {
280 pte_val(pte
) &= ~_PAGE_USER
; return pte
; }
281 static inline pte_t
pte_exprotect(pte_t pte
) {
282 pte_val(pte
) &= ~_PAGE_EXEC
; return pte
; }
283 static inline pte_t
pte_wrprotect(pte_t pte
) {
284 pte_val(pte
) &= ~(_PAGE_RW
); return pte
; }
285 static inline pte_t
pte_mkclean(pte_t pte
) {
286 pte_val(pte
) &= ~(_PAGE_DIRTY
); return pte
; }
287 static inline pte_t
pte_mkold(pte_t pte
) {
288 pte_val(pte
) &= ~_PAGE_ACCESSED
; return pte
; }
290 static inline pte_t
pte_mkread(pte_t pte
) {
291 pte_val(pte
) |= _PAGE_USER
; return pte
; }
292 static inline pte_t
pte_mkexec(pte_t pte
) {
293 pte_val(pte
) |= _PAGE_USER
| _PAGE_EXEC
; return pte
; }
294 static inline pte_t
pte_mkwrite(pte_t pte
) {
295 pte_val(pte
) |= _PAGE_RW
; return pte
; }
296 static inline pte_t
pte_mkdirty(pte_t pte
) {
297 pte_val(pte
) |= _PAGE_DIRTY
; return pte
; }
298 static inline pte_t
pte_mkyoung(pte_t pte
) {
299 pte_val(pte
) |= _PAGE_ACCESSED
; return pte
; }
300 static inline pte_t
pte_mkhuge(pte_t pte
) {
301 pte_val(pte
) |= _PAGE_HUGE
; return pte
; }
303 /* Atomic PTE updates */
304 static inline unsigned long pte_update(pte_t
*p
, unsigned long clr
)
306 unsigned long old
, tmp
;
308 __asm__
__volatile__(
309 "1: ldarx %0,0,%3 # pte_update\n\
315 : "=&r" (old
), "=&r" (tmp
), "=m" (*p
)
316 : "r" (p
), "r" (clr
), "m" (*p
), "i" (_PAGE_BUSY
)
321 /* PTE updating functions, this function puts the PTE in the
322 * batch, doesn't actually triggers the hash flush immediately,
323 * you need to call flush_tlb_pending() to do that.
325 extern void hpte_update(struct mm_struct
*mm
, unsigned long addr
, unsigned long pte
,
328 static inline int __ptep_test_and_clear_young(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
332 if ((pte_val(*ptep
) & (_PAGE_ACCESSED
| _PAGE_HASHPTE
)) == 0)
334 old
= pte_update(ptep
, _PAGE_ACCESSED
);
335 if (old
& _PAGE_HASHPTE
) {
336 hpte_update(mm
, addr
, old
, 0);
339 return (old
& _PAGE_ACCESSED
) != 0;
341 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
342 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
345 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
350 * On RW/DIRTY bit transitions we can avoid flushing the hpte. For the
351 * moment we always flush but we need to fix hpte_update and test if the
352 * optimisation is worth it.
354 static inline int __ptep_test_and_clear_dirty(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
358 if ((pte_val(*ptep
) & _PAGE_DIRTY
) == 0)
360 old
= pte_update(ptep
, _PAGE_DIRTY
);
361 if (old
& _PAGE_HASHPTE
)
362 hpte_update(mm
, addr
, old
, 0);
363 return (old
& _PAGE_DIRTY
) != 0;
365 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
366 #define ptep_test_and_clear_dirty(__vma, __addr, __ptep) \
369 __r = __ptep_test_and_clear_dirty((__vma)->vm_mm, __addr, __ptep); \
373 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
374 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
378 if ((pte_val(*ptep
) & _PAGE_RW
) == 0)
380 old
= pte_update(ptep
, _PAGE_RW
);
381 if (old
& _PAGE_HASHPTE
)
382 hpte_update(mm
, addr
, old
, 0);
386 * We currently remove entries from the hashtable regardless of whether
387 * the entry was young or dirty. The generic routines only flush if the
388 * entry was young or dirty which is not good enough.
390 * We should be more intelligent about this but for the moment we override
391 * these functions and force a tlb flush unconditionally
393 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
394 #define ptep_clear_flush_young(__vma, __address, __ptep) \
396 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
401 #define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
402 #define ptep_clear_flush_dirty(__vma, __address, __ptep) \
404 int __dirty = __ptep_test_and_clear_dirty((__vma)->vm_mm, __address, \
406 flush_tlb_page(__vma, __address); \
410 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
411 static inline pte_t
ptep_get_and_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
413 unsigned long old
= pte_update(ptep
, ~0UL);
415 if (old
& _PAGE_HASHPTE
)
416 hpte_update(mm
, addr
, old
, 0);
420 static inline void pte_clear(struct mm_struct
*mm
, unsigned long addr
, pte_t
* ptep
)
422 unsigned long old
= pte_update(ptep
, ~0UL);
424 if (old
& _PAGE_HASHPTE
)
425 hpte_update(mm
, addr
, old
, 0);
429 * set_pte stores a linux PTE into the linux page table.
431 static inline void set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
432 pte_t
*ptep
, pte_t pte
)
434 if (pte_present(*ptep
)) {
435 pte_clear(mm
, addr
, ptep
);
438 *ptep
= __pte(pte_val(pte
) & ~_PAGE_HPTEFLAGS
);
441 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
442 * function doesn't need to flush the hash entry
444 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
445 static inline void __ptep_set_access_flags(pte_t
*ptep
, pte_t entry
, int dirty
)
447 unsigned long bits
= pte_val(entry
) &
448 (_PAGE_DIRTY
| _PAGE_ACCESSED
| _PAGE_RW
| _PAGE_EXEC
);
449 unsigned long old
, tmp
;
451 __asm__
__volatile__(
458 :"=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
459 :"r" (bits
), "r" (ptep
), "m" (*ptep
), "i" (_PAGE_BUSY
)
462 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
464 __ptep_set_access_flags(__ptep, __entry, __dirty); \
465 flush_tlb_page_nohash(__vma, __address); \
469 * Macro to mark a page protection value as "uncacheable".
471 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED))
474 extern pgprot_t
phys_mem_access_prot(struct file
*file
, unsigned long addr
,
475 unsigned long size
, pgprot_t vma_prot
);
476 #define __HAVE_PHYS_MEM_ACCESS_PROT
478 #define __HAVE_ARCH_PTE_SAME
479 #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0)
481 #define pmd_ERROR(e) \
482 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
483 #define pud_ERROR(e) \
484 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pud_val(e))
485 #define pgd_ERROR(e) \
486 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
488 extern pgd_t swapper_pg_dir
[];
490 extern void paging_init(void);
492 #ifdef CONFIG_HUGETLB_PAGE
493 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) \
494 free_pgd_range(tlb, addr, end, floor, ceiling)
498 * This gets called at the end of handling a page fault, when
499 * the kernel has put a new PTE into the page table for the process.
500 * We use it to put a corresponding HPTE into the hash table
501 * ahead of time, instead of waiting for the inevitable extra
502 * hash-table miss exception.
504 struct vm_area_struct
;
505 extern void update_mmu_cache(struct vm_area_struct
*, unsigned long, pte_t
);
507 /* Encode and de-code a swap entry */
508 #define __swp_type(entry) (((entry).val >> 1) & 0x3f)
509 #define __swp_offset(entry) ((entry).val >> 8)
510 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
511 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
512 #define __swp_entry_to_pte(x) ((pte_t) { (x).val << PTE_SHIFT })
513 #define pte_to_pgoff(pte) (pte_val(pte) >> PTE_SHIFT)
514 #define pgoff_to_pte(off) ((pte_t) {((off) << PTE_SHIFT)|_PAGE_FILE})
515 #define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_SHIFT)
518 * kern_addr_valid is intended to indicate whether an address is a valid
519 * kernel address. Most 32-bit archs define it as always true (like this)
520 * but most 64-bit archs actually perform a test. What should we do here?
521 * The only use is in fs/ncpfs/dir.c
523 #define kern_addr_valid(addr) (1)
525 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
526 remap_pfn_range(vma, vaddr, pfn, size, prot)
528 void pgtable_cache_init(void);
531 * find_linux_pte returns the address of a linux pte for a given
532 * effective address and directory. If not found, it returns zero.
534 static inline pte_t
*find_linux_pte(pgd_t
*pgdir
, unsigned long ea
)
542 pg
= pgdir
+ pgd_index(ea
);
543 if (!pgd_none(*pg
)) {
544 pu
= pud_offset(pg
, ea
);
545 if (!pud_none(*pu
)) {
546 pm
= pmd_offset(pu
, ea
);
547 if (pmd_present(*pm
)) {
548 pt
= pte_offset_kernel(pm
, ea
);
550 if (!pte_present(pte
))
559 #include <asm-generic/pgtable.h>
561 #endif /* __ASSEMBLY__ */
563 #endif /* _PPC64_PGTABLE_H */