1 #ifndef _X86_64_PGTABLE_H
2 #define _X86_64_PGTABLE_H
4 #include <linux/const.h>
8 * This file contains the functions and defines necessary to modify and use
9 * the x86-64 page table tree.
11 #include <asm/processor.h>
12 #include <asm/bitops.h>
13 #include <linux/threads.h>
16 extern pud_t level3_kernel_pgt
[512];
17 extern pud_t level3_ident_pgt
[512];
18 extern pmd_t level2_kernel_pgt
[512];
19 extern pgd_t init_level4_pgt
[];
20 extern unsigned long __supported_pte_mask
;
22 #define swapper_pg_dir init_level4_pgt
24 extern void paging_init(void);
25 extern void clear_kernel_mapping(unsigned long addr
, unsigned long size
);
28 * ZERO_PAGE is a global shared page that is always zero: used
29 * for zero-mapped memory areas etc..
31 extern unsigned long empty_zero_page
[PAGE_SIZE
/sizeof(unsigned long)];
32 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
34 #endif /* !__ASSEMBLY__ */
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
62 #define pte_ERROR(e) \
63 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
64 #define pmd_ERROR(e) \
65 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
66 #define pud_ERROR(e) \
67 printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
68 #define pgd_ERROR(e) \
69 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
71 #define pgd_none(x) (!pgd_val(x))
72 #define pud_none(x) (!pud_val(x))
74 static inline void set_pte(pte_t
*dst
, pte_t val
)
76 pte_val(*dst
) = pte_val(val
);
78 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
80 static inline void set_pmd(pmd_t
*dst
, pmd_t val
)
82 pmd_val(*dst
) = pmd_val(val
);
85 static inline void set_pud(pud_t
*dst
, pud_t val
)
87 pud_val(*dst
) = pud_val(val
);
90 static inline void pud_clear (pud_t
*pud
)
92 set_pud(pud
, __pud(0));
95 static inline void set_pgd(pgd_t
*dst
, pgd_t val
)
97 pgd_val(*dst
) = pgd_val(val
);
100 static inline void pgd_clear (pgd_t
* pgd
)
102 set_pgd(pgd
, __pgd(0));
105 #define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
109 static inline pte_t
ptep_get_and_clear_full(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
, int full
)
116 pte
= ptep_get_and_clear(mm
, addr
, ptep
);
121 #define pte_same(a, b) ((a).pte == (b).pte)
123 #define pte_pgprot(a) (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
125 #endif /* !__ASSEMBLY__ */
127 #define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
128 #define PMD_MASK (~(PMD_SIZE-1))
129 #define PUD_SIZE (_AC(1,UL) << PUD_SHIFT)
130 #define PUD_MASK (~(PUD_SIZE-1))
131 #define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
132 #define PGDIR_MASK (~(PGDIR_SIZE-1))
134 #define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
135 #define FIRST_USER_ADDRESS 0
137 #define MAXMEM _AC(0x3fffffffffff, UL)
138 #define VMALLOC_START _AC(0xffffc20000000000, UL)
139 #define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
140 #define MODULES_VADDR _AC(0xffffffff88000000, UL)
141 #define MODULES_END _AC(0xfffffffffff00000, UL)
142 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
144 #define _PAGE_BIT_PRESENT 0
145 #define _PAGE_BIT_RW 1
146 #define _PAGE_BIT_USER 2
147 #define _PAGE_BIT_PWT 3
148 #define _PAGE_BIT_PCD 4
149 #define _PAGE_BIT_ACCESSED 5
150 #define _PAGE_BIT_DIRTY 6
151 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
152 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
153 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
155 #define _PAGE_PRESENT 0x001
156 #define _PAGE_RW 0x002
157 #define _PAGE_USER 0x004
158 #define _PAGE_PWT 0x008
159 #define _PAGE_PCD 0x010
160 #define _PAGE_ACCESSED 0x020
161 #define _PAGE_DIRTY 0x040
162 #define _PAGE_PSE 0x080 /* 2MB page */
163 #define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */
164 #define _PAGE_GLOBAL 0x100 /* Global TLB entry */
166 #define _PAGE_PROTNONE 0x080 /* If not present */
167 #define _PAGE_NX (_AC(1,UL)<<_PAGE_BIT_NX)
169 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
170 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
172 #define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
174 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
175 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
176 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
177 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
178 #define PAGE_COPY PAGE_COPY_NOEXEC
179 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
180 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
181 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
182 #define __PAGE_KERNEL \
183 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
184 #define __PAGE_KERNEL_EXEC \
185 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
186 #define __PAGE_KERNEL_NOCACHE \
187 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
188 #define __PAGE_KERNEL_RO \
189 (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
190 #define __PAGE_KERNEL_VSYSCALL \
191 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
192 #define __PAGE_KERNEL_VSYSCALL_NOCACHE \
193 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
194 #define __PAGE_KERNEL_LARGE \
195 (__PAGE_KERNEL | _PAGE_PSE)
196 #define __PAGE_KERNEL_LARGE_EXEC \
197 (__PAGE_KERNEL_EXEC | _PAGE_PSE)
199 #define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
201 #define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
202 #define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
203 #define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
204 #define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
205 #define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
206 #define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
207 #define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
208 #define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
211 #define __P000 PAGE_NONE
212 #define __P001 PAGE_READONLY
213 #define __P010 PAGE_COPY
214 #define __P011 PAGE_COPY
215 #define __P100 PAGE_READONLY_EXEC
216 #define __P101 PAGE_READONLY_EXEC
217 #define __P110 PAGE_COPY_EXEC
218 #define __P111 PAGE_COPY_EXEC
220 #define __S000 PAGE_NONE
221 #define __S001 PAGE_READONLY
222 #define __S010 PAGE_SHARED
223 #define __S011 PAGE_SHARED
224 #define __S100 PAGE_READONLY_EXEC
225 #define __S101 PAGE_READONLY_EXEC
226 #define __S110 PAGE_SHARED_EXEC
227 #define __S111 PAGE_SHARED_EXEC
231 static inline unsigned long pgd_bad(pgd_t pgd
)
233 return pgd_val(pgd
) & ~(PTE_MASK
| _KERNPG_TABLE
| _PAGE_USER
);
236 static inline unsigned long pud_bad(pud_t pud
)
238 return pud_val(pud
) & ~(PTE_MASK
| _KERNPG_TABLE
| _PAGE_USER
);
241 static inline unsigned long pmd_bad(pmd_t pmd
)
243 return pmd_val(pmd
) & ~(PTE_MASK
| _KERNPG_TABLE
| _PAGE_USER
);
246 #define pte_none(x) (!pte_val(x))
247 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
248 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
250 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
252 #define pte_page(x) pfn_to_page(pte_pfn(x))
253 #define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
255 static inline pte_t
pfn_pte(unsigned long page_nr
, pgprot_t pgprot
)
258 pte_val(pte
) = (page_nr
<< PAGE_SHIFT
);
259 pte_val(pte
) |= pgprot_val(pgprot
);
260 pte_val(pte
) &= __supported_pte_mask
;
265 * The following only work if pte_present() is true.
266 * Undefined behaviour if not..
268 #define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
269 static inline int pte_dirty(pte_t pte
) { return pte_val(pte
) & _PAGE_DIRTY
; }
270 static inline int pte_young(pte_t pte
) { return pte_val(pte
) & _PAGE_ACCESSED
; }
271 static inline int pte_write(pte_t pte
) { return pte_val(pte
) & _PAGE_RW
; }
272 static inline int pte_file(pte_t pte
) { return pte_val(pte
) & _PAGE_FILE
; }
273 static inline int pte_huge(pte_t pte
) { return pte_val(pte
) & _PAGE_PSE
; }
275 static inline pte_t
pte_mkclean(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_DIRTY
)); return pte
; }
276 static inline pte_t
pte_mkold(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_ACCESSED
)); return pte
; }
277 static inline pte_t
pte_wrprotect(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_RW
)); return pte
; }
278 static inline pte_t
pte_mkexec(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_NX
)); return pte
; }
279 static inline pte_t
pte_mkdirty(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_DIRTY
)); return pte
; }
280 static inline pte_t
pte_mkyoung(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_ACCESSED
)); return pte
; }
281 static inline pte_t
pte_mkwrite(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_RW
)); return pte
; }
282 static inline pte_t
pte_mkhuge(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) | _PAGE_PSE
)); return pte
; }
283 static inline pte_t
pte_clrhuge(pte_t pte
) { set_pte(&pte
, __pte(pte_val(pte
) & ~_PAGE_PSE
)); return pte
; }
285 struct vm_area_struct
;
287 static inline int ptep_test_and_clear_young(struct vm_area_struct
*vma
, unsigned long addr
, pte_t
*ptep
)
289 if (!pte_young(*ptep
))
291 return test_and_clear_bit(_PAGE_BIT_ACCESSED
, &ptep
->pte
);
294 static inline void ptep_set_wrprotect(struct mm_struct
*mm
, unsigned long addr
, pte_t
*ptep
)
296 clear_bit(_PAGE_BIT_RW
, &ptep
->pte
);
300 * Macro to mark a page protection value as "uncacheable".
302 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
304 static inline int pmd_large(pmd_t pte
) {
305 return (pmd_val(pte
) & __LARGE_PTE
) == __LARGE_PTE
;
310 * Conversion functions: convert a page and protection to a page entry,
311 * and a page entry and page directory to the page they refer to.
317 #define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
318 #define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
319 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
320 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
321 #define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
322 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
323 #define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
325 /* PUD - Level3 access */
326 /* to find an entry in a page-table-directory. */
327 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
328 #define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
329 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
330 #define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
331 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
333 /* PMD - Level 2 access */
334 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
335 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
337 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
338 #define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
340 #define pmd_none(x) (!pmd_val(x))
341 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
342 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
343 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
344 #define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
346 #define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
347 #define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
348 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
350 /* PTE - Level 1 access. */
352 /* page, protection -> pte */
353 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
354 #define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
356 /* Change flags of a PTE */
357 static inline pte_t
pte_modify(pte_t pte
, pgprot_t newprot
)
359 pte_val(pte
) &= _PAGE_CHG_MASK
;
360 pte_val(pte
) |= pgprot_val(newprot
);
361 pte_val(pte
) &= __supported_pte_mask
;
365 #define pte_index(address) \
366 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
367 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
370 /* x86-64 always has all page tables mapped. */
371 #define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
372 #define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
373 #define pte_unmap(pte) /* NOP */
374 #define pte_unmap_nested(pte) /* NOP */
376 #define update_mmu_cache(vma,address,pte) do { } while (0)
378 /* We only update the dirty/accessed state if we set
379 * the dirty bit by hand in the kernel, since the hardware
380 * will do the accessed bit for us, and we don't want to
381 * race with other CPU's that might be updating the dirty
382 * bit at the same time. */
383 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
384 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
386 int __changed = !pte_same(*(__ptep), __entry); \
387 if (__changed && __dirty) { \
388 set_pte(__ptep, __entry); \
389 flush_tlb_page(__vma, __address); \
394 /* Encode and de-code a swap entry */
395 #define __swp_type(x) (((x).val >> 1) & 0x3f)
396 #define __swp_offset(x) ((x).val >> 8)
397 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
398 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
399 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
401 extern spinlock_t pgd_lock
;
402 extern struct list_head pgd_list
;
404 extern int kern_addr_valid(unsigned long addr
);
406 pte_t
*lookup_address(unsigned long addr
);
408 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
409 remap_pfn_range(vma, vaddr, pfn, size, prot)
411 #define HAVE_ARCH_UNMAPPED_AREA
413 #define pgtable_cache_init() do { } while (0)
415 #define PAGE_AGP PAGE_KERNEL_NOCACHE
416 #define HAVE_PAGE_AGP 1
418 /* fs/proc/kcore.c */
419 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
420 #define kc_offset_to_vaddr(o) \
421 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
423 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
424 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
425 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
426 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
427 #define __HAVE_ARCH_PTE_SAME
428 #include <asm-generic/pgtable.h>
429 #endif /* !__ASSEMBLY__ */
431 #endif /* _X86_64_PGTABLE_H */