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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/asm-x86_64/pgtable.h
1 #ifndef _X86_64_PGTABLE_H
2 #define _X86_64_PGTABLE_H
5 * This file contains the functions and defines necessary to modify and use
6 * the x86-64 page table tree.
8 #include <asm/processor.h>
9 #include <asm/fixmap.h>
10 #include <asm/bitops.h>
11 #include <linux/threads.h>
14 extern pud_t level3_kernel_pgt
[512];
15 extern pud_t level3_physmem_pgt
[512];
16 extern pud_t level3_ident_pgt
[512];
17 extern pmd_t level2_kernel_pgt
[512];
18 extern pgd_t init_level4_pgt
[];
19 extern unsigned long __supported_pte_mask
;
21 #define swapper_pg_dir init_level4_pgt
23 extern int nonx_setup(char *str
);
24 extern void paging_init(void);
25 extern void clear_kernel_mapping(unsigned long addr
, unsigned long size
);
27 extern unsigned long pgkern_mask
;
30 * ZERO_PAGE is a global shared page that is always zero: used
31 * for zero-mapped memory areas etc..
33 extern unsigned long empty_zero_page
[PAGE_SIZE
/sizeof(unsigned long)];
34 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
37 * PGDIR_SHIFT determines what a top-level page table entry can map
39 #define PGDIR_SHIFT 39
40 #define PTRS_PER_PGD 512
46 #define PTRS_PER_PUD 512
49 * PMD_SHIFT determines the size of the area a middle-level
53 #define PTRS_PER_PMD 512
56 * entries per page directory level
58 #define PTRS_PER_PTE 512
60 #define pte_ERROR(e) \
61 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
62 #define pmd_ERROR(e) \
63 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
64 #define pud_ERROR(e) \
65 printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
66 #define pgd_ERROR(e) \
67 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
69 #define pgd_none(x) (!pgd_val(x))
70 #define pud_none(x) (!pud_val(x))
72 static inline void set_pte(pte_t
*dst
, pte_t val
)
74 pte_val(*dst
) = pte_val(val
);
76 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
78 static inline void set_pmd(pmd_t
*dst
, pmd_t val
)
80 pmd_val(*dst
) = pmd_val(val
);
83 static inline void set_pud(pud_t
*dst
, pud_t val
)
85 pud_val(*dst
) = pud_val(val
);
88 extern inline void pud_clear (pud_t
*pud
)
90 set_pud(pud
, __pud(0));
93 static inline void set_pgd(pgd_t
*dst
, pgd_t val
)
95 pgd_val(*dst
) = pgd_val(val
);
98 extern inline void pgd_clear (pgd_t
* pgd
)
100 set_pgd(pgd
, __pgd(0));
103 #define pud_page(pud) \
104 ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
106 #define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
107 #define pte_same(a, b) ((a).pte == (b).pte)
109 #define PMD_SIZE (1UL << PMD_SHIFT)
110 #define PMD_MASK (~(PMD_SIZE-1))
111 #define PUD_SIZE (1UL << PUD_SHIFT)
112 #define PUD_MASK (~(PUD_SIZE-1))
113 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
114 #define PGDIR_MASK (~(PGDIR_SIZE-1))
116 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
117 #define FIRST_USER_ADDRESS 0
120 #define MAXMEM 0x3fffffffffffUL
121 #define VMALLOC_START 0xffffc20000000000UL
122 #define VMALLOC_END 0xffffe1ffffffffffUL
123 #define MODULES_VADDR 0xffffffff88000000UL
124 #define MODULES_END 0xfffffffffff00000UL
125 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
127 #define _PAGE_BIT_PRESENT 0
128 #define _PAGE_BIT_RW 1
129 #define _PAGE_BIT_USER 2
130 #define _PAGE_BIT_PWT 3
131 #define _PAGE_BIT_PCD 4
132 #define _PAGE_BIT_ACCESSED 5
133 #define _PAGE_BIT_DIRTY 6
134 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
135 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
136 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
138 #define _PAGE_PRESENT 0x001
139 #define _PAGE_RW 0x002
140 #define _PAGE_USER 0x004
141 #define _PAGE_PWT 0x008
142 #define _PAGE_PCD 0x010
143 #define _PAGE_ACCESSED 0x020
144 #define _PAGE_DIRTY 0x040
145 #define _PAGE_PSE 0x080 /* 2MB page */
146 #define _PAGE_FILE 0x040 /* set:pagecache, unset:swap */
147 #define _PAGE_GLOBAL 0x100 /* Global TLB entry */
149 #define _PAGE_PROTNONE 0x080 /* If not present */
150 #define _PAGE_NX (1UL<<_PAGE_BIT_NX)
152 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
153 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
155 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
157 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
158 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
159 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
160 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
161 #define PAGE_COPY PAGE_COPY_NOEXEC
162 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
163 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
164 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
165 #define __PAGE_KERNEL \
166 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
167 #define __PAGE_KERNEL_EXEC \
168 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
169 #define __PAGE_KERNEL_NOCACHE \
170 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
171 #define __PAGE_KERNEL_RO \
172 (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
173 #define __PAGE_KERNEL_VSYSCALL \
174 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
175 #define __PAGE_KERNEL_VSYSCALL_NOCACHE \
176 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
177 #define __PAGE_KERNEL_LARGE \
178 (__PAGE_KERNEL | _PAGE_PSE)
179 #define __PAGE_KERNEL_LARGE_EXEC \
180 (__PAGE_KERNEL_EXEC | _PAGE_PSE)
182 #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
184 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
185 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
186 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
187 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
188 #define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
189 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
190 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
191 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
194 #define __P000 PAGE_NONE
195 #define __P001 PAGE_READONLY
196 #define __P010 PAGE_COPY
197 #define __P011 PAGE_COPY
198 #define __P100 PAGE_READONLY_EXEC
199 #define __P101 PAGE_READONLY_EXEC
200 #define __P110 PAGE_COPY_EXEC
201 #define __P111 PAGE_COPY_EXEC
203 #define __S000 PAGE_NONE
204 #define __S001 PAGE_READONLY
205 #define __S010 PAGE_SHARED
206 #define __S011 PAGE_SHARED
207 #define __S100 PAGE_READONLY_EXEC
208 #define __S101 PAGE_READONLY_EXEC
209 #define __S110 PAGE_SHARED_EXEC
210 #define __S111 PAGE_SHARED_EXEC
212 static inline unsigned long pgd_bad(pgd_t pgd
)
214 unsigned long val
= pgd_val(pgd
);
216 val
&= ~(_PAGE_USER
| _PAGE_DIRTY
);
217 return val
& ~(_PAGE_PRESENT
| _PAGE_RW
| _PAGE_ACCESSED
);
220 static inline unsigned long pud_bad(pud_t pud
)
222 unsigned long val
= pud_val(pud
);
224 val
&= ~(_PAGE_USER
| _PAGE_DIRTY
);
225 return val
& ~(_PAGE_PRESENT
| _PAGE_RW
| _PAGE_ACCESSED
);
228 #define pte_none(x) (!pte_val(x))
229 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
230 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
232 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
234 #define pte_page(x) pfn_to_page(pte_pfn(x))
235 #define pte_pfn(x) ((pte_val(x) >> PAGE_SHIFT) & __PHYSICAL_MASK)
237 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
240 pte_val(pte
) = (page_nr
<< PAGE_SHIFT
);
241 pte_val(pte
) |= pgprot_val(pgprot
);
242 pte_val(pte
) &= __supported_pte_mask
;
247 * The following only work if pte_present() is true.
248 * Undefined behaviour if not..
250 static inline int pte_user(pte_t pte
) { return pte_val(pte
) & _PAGE_USER
; }
251 extern inline int pte_read(pte_t pte
) { return pte_val(pte
) & _PAGE_USER
; }
252 extern inline int pte_exec(pte_t pte
) { return pte_val(pte
) & _PAGE_USER
; }
253 extern inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_DIRTY
; }
254 extern inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
255 extern inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_RW
; }
256 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
258 #define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
259 extern inline pte_t
pte_rdprotect(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_USER
)); return pte
; }
260 extern inline pte_t
pte_exprotect(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_USER
)); return pte
; }
261 extern inline pte_t
pte_mkclean(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_DIRTY
)); return pte
; }
262 extern inline pte_t
pte_mkold(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_ACCESSED
)); return pte
; }
263 extern inline pte_t
pte_wrprotect(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_RW
)); return pte
; }
264 extern inline pte_t
pte_mkread(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_USER
)); return pte
; }
265 extern inline pte_t
pte_mkexec(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_USER
)); return pte
; }
266 extern inline pte_t
pte_mkdirty(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_DIRTY
)); return pte
; }
267 extern inline pte_t
pte_mkyoung(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_ACCESSED
)); return pte
; }
268 extern inline pte_t
pte_mkwrite(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_RW
)); return pte
; }
269 extern inline pte_t
pte_mkhuge(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | __LARGE_PTE
)); return pte
; }
271 struct vm_area_struct
;
273 static inline int ptep_test_and_clear_dirty(struct vm_area_struct
*vma
, unsigned long addr
, pte_t
*ptep
)
275 if (!pte_dirty(*ptep
))
277 return test_and_clear_bit(_PAGE_BIT_DIRTY
, ptep
);
280 static inline int ptep_test_and_clear_young(struct vm_area_struct
*vma
, unsigned long addr
, pte_t
*ptep
)
282 if (!pte_young(*ptep
))
284 return test_and_clear_bit(_PAGE_BIT_ACCESSED
, ptep
);
287 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
289 clear_bit(_PAGE_BIT_RW
, ptep
);
293 * Macro to mark a page protection value as "uncacheable".
295 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
297 static inline int pmd_large(pmd_t pte
) {
298 return (pmd_val(pte
) & __LARGE_PTE
) == __LARGE_PTE
;
303 * Conversion functions: convert a page and protection to a page entry,
304 * and a page entry and page directory to the page they refer to.
307 #define page_pte(page) page_pte_prot(page, __pgprot(0))
312 #define pgd_page(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
313 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
314 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
315 #define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
316 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
317 #define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
319 /* PUD - Level3 access */
320 /* to find an entry in a page-table-directory. */
321 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
322 #define pud_offset(pgd, address) ((pud_t *) pgd_page(*(pgd)) + pud_index(address))
323 #define pud_offset_k(pgd, addr) pud_offset(pgd, addr)
324 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
326 static inline pud_t
*__pud_offset_k(pud_t
*pud
, unsigned long address
)
328 return pud
+ pud_index(address
);
331 /* PMD - Level 2 access */
332 #define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
333 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
335 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
336 #define pmd_offset(dir, address) ((pmd_t *) pud_page(*(dir)) + \
338 #define pmd_none(x) (!pmd_val(x))
339 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
340 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
341 #define pmd_bad(x) ((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
342 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
343 #define pmd_pfn(x) ((pmd_val(x) >> PAGE_SHIFT) & __PHYSICAL_MASK)
345 #define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
346 #define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
347 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
349 /* PTE - Level 1 access. */
351 /* page, protection -> pte */
352 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
353 #define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
355 /* physical address -> PTE */
356 static inline pte_t
mk_pte_phys(unsigned long physpage
, pgprot_t pgprot
)
359 pte_val(pte
) = physpage
| pgprot_val(pgprot
);
363 /* Change flags of a PTE */
364 extern inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
366 pte_val(pte
) &= _PAGE_CHG_MASK
;
367 pte_val(pte
) |= pgprot_val(newprot
);
368 pte_val(pte
) &= __supported_pte_mask
;
372 #define pte_index(address) \
373 ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
374 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_kernel(*(dir)) + \
377 /* x86-64 always has all page tables mapped. */
378 #define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
379 #define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
380 #define pte_unmap(pte) /* NOP */
381 #define pte_unmap_nested(pte) /* NOP */
383 #define update_mmu_cache(vma,address,pte) do { } while (0)
385 /* We only update the dirty/accessed state if we set
386 * the dirty bit by hand in the kernel, since the hardware
387 * will do the accessed bit for us, and we don't want to
388 * race with other CPU's that might be updating the dirty
389 * bit at the same time. */
390 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
391 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
394 set_pte(__ptep, __entry); \
395 flush_tlb_page(__vma, __address); \
399 /* Encode and de-code a swap entry */
400 #define __swp_type(x) (((x).val >> 1) & 0x3f)
401 #define __swp_offset(x) ((x).val >> 8)
402 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
403 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
404 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
406 #endif /* !__ASSEMBLY__ */
408 extern int kern_addr_valid(unsigned long addr
);
410 #define io_remap_page_range(vma, vaddr, paddr, size, prot) \
411 remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
413 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
414 remap_pfn_range(vma, vaddr, pfn, size, prot)
416 #define MK_IOSPACE_PFN(space, pfn) (pfn)
417 #define GET_IOSPACE(pfn) 0
418 #define GET_PFN(pfn) (pfn)
420 #define HAVE_ARCH_UNMAPPED_AREA
422 #define pgtable_cache_init() do { } while (0)
423 #define check_pgt_cache() do { } while (0)
425 #define PAGE_AGP PAGE_KERNEL_NOCACHE
426 #define HAVE_PAGE_AGP 1
428 /* fs/proc/kcore.c */
429 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
430 #define kc_offset_to_vaddr(o) \
431 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
433 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
434 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
435 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
436 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
437 #define __HAVE_ARCH_PTE_SAME
438 #include <asm-generic/pgtable.h>
440 #endif /* _X86_64_PGTABLE_H */