Linux kernel mirror (for testing)
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1#ifndef _X86_64_PGTABLE_H
2#define _X86_64_PGTABLE_H
3
4/*
5 * This file contains the functions and defines necessary to modify and use
6 * the x86-64 page table tree.
7 */
8#include <asm/processor.h>
9#include <asm/fixmap.h>
10#include <asm/bitops.h>
11#include <linux/threads.h>
12#include <asm/pda.h>
13
14extern pud_t level3_kernel_pgt[512];
15extern pud_t level3_physmem_pgt[512];
16extern pud_t level3_ident_pgt[512];
17extern pmd_t level2_kernel_pgt[512];
18extern pgd_t init_level4_pgt[];
19extern unsigned long __supported_pte_mask;
20
21#define swapper_pg_dir init_level4_pgt
22
23extern int nonx_setup(char *str);
24extern void paging_init(void);
25extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
26
27extern unsigned long pgkern_mask;
28
29/*
30 * ZERO_PAGE is a global shared page that is always zero: used
31 * for zero-mapped memory areas etc..
32 */
33extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
34#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
35
36/*
37 * PGDIR_SHIFT determines what a top-level page table entry can map
38 */
39#define PGDIR_SHIFT 39
40#define PTRS_PER_PGD 512
41
42/*
43 * 3rd level page
44 */
45#define PUD_SHIFT 30
46#define PTRS_PER_PUD 512
47
48/*
49 * PMD_SHIFT determines the size of the area a middle-level
50 * page table can map
51 */
52#define PMD_SHIFT 21
53#define PTRS_PER_PMD 512
54
55/*
56 * entries per page directory level
57 */
58#define PTRS_PER_PTE 512
59
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))
68
69#define pgd_none(x) (!pgd_val(x))
70#define pud_none(x) (!pud_val(x))
71
72static inline void set_pte(pte_t *dst, pte_t val)
73{
74 pte_val(*dst) = pte_val(val);
75}
76#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
77
78static inline void set_pmd(pmd_t *dst, pmd_t val)
79{
80 pmd_val(*dst) = pmd_val(val);
81}
82
83static inline void set_pud(pud_t *dst, pud_t val)
84{
85 pud_val(*dst) = pud_val(val);
86}
87
88static inline void pud_clear (pud_t *pud)
89{
90 set_pud(pud, __pud(0));
91}
92
93static inline void set_pgd(pgd_t *dst, pgd_t val)
94{
95 pgd_val(*dst) = pgd_val(val);
96}
97
98static inline void pgd_clear (pgd_t * pgd)
99{
100 set_pgd(pgd, __pgd(0));
101}
102
103#define pud_page(pud) \
104((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
105
106#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
107
108static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
109{
110 pte_t pte;
111 if (full) {
112 pte = *ptep;
113 *ptep = __pte(0);
114 } else {
115 pte = ptep_get_and_clear(mm, addr, ptep);
116 }
117 return pte;
118}
119
120#define pte_same(a, b) ((a).pte == (b).pte)
121
122#define PMD_SIZE (1UL << PMD_SHIFT)
123#define PMD_MASK (~(PMD_SIZE-1))
124#define PUD_SIZE (1UL << PUD_SHIFT)
125#define PUD_MASK (~(PUD_SIZE-1))
126#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
127#define PGDIR_MASK (~(PGDIR_SIZE-1))
128
129#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
130#define FIRST_USER_ADDRESS 0
131
132#ifndef __ASSEMBLY__
133#define MAXMEM 0x3fffffffffffUL
134#define VMALLOC_START 0xffffc20000000000UL
135#define VMALLOC_END 0xffffe1ffffffffffUL
136#define MODULES_VADDR 0xffffffff88000000UL
137#define MODULES_END 0xfffffffffff00000UL
138#define MODULES_LEN (MODULES_END - MODULES_VADDR)
139
140#define _PAGE_BIT_PRESENT 0
141#define _PAGE_BIT_RW 1
142#define _PAGE_BIT_USER 2
143#define _PAGE_BIT_PWT 3
144#define _PAGE_BIT_PCD 4
145#define _PAGE_BIT_ACCESSED 5
146#define _PAGE_BIT_DIRTY 6
147#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
148#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
149#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
150
151#define _PAGE_PRESENT 0x001
152#define _PAGE_RW 0x002
153#define _PAGE_USER 0x004
154#define _PAGE_PWT 0x008
155#define _PAGE_PCD 0x010
156#define _PAGE_ACCESSED 0x020
157#define _PAGE_DIRTY 0x040
158#define _PAGE_PSE 0x080 /* 2MB page */
159#define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */
160#define _PAGE_GLOBAL 0x100 /* Global TLB entry */
161
162#define _PAGE_PROTNONE 0x080 /* If not present */
163#define _PAGE_NX (1UL<<_PAGE_BIT_NX)
164
165#define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
166#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
167
168#define _PAGE_CHG_MASK (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
169
170#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
171#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
172#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
173#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
174#define PAGE_COPY PAGE_COPY_NOEXEC
175#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
176#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
177#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
178#define __PAGE_KERNEL \
179 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
180#define __PAGE_KERNEL_EXEC \
181 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
182#define __PAGE_KERNEL_NOCACHE \
183 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
184#define __PAGE_KERNEL_RO \
185 (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
186#define __PAGE_KERNEL_VSYSCALL \
187 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
188#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
189 (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
190#define __PAGE_KERNEL_LARGE \
191 (__PAGE_KERNEL | _PAGE_PSE)
192#define __PAGE_KERNEL_LARGE_EXEC \
193 (__PAGE_KERNEL_EXEC | _PAGE_PSE)
194
195#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
196
197#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
198#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
199#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
200#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
201#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
202#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
203#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
204#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
205
206/* xwr */
207#define __P000 PAGE_NONE
208#define __P001 PAGE_READONLY
209#define __P010 PAGE_COPY
210#define __P011 PAGE_COPY
211#define __P100 PAGE_READONLY_EXEC
212#define __P101 PAGE_READONLY_EXEC
213#define __P110 PAGE_COPY_EXEC
214#define __P111 PAGE_COPY_EXEC
215
216#define __S000 PAGE_NONE
217#define __S001 PAGE_READONLY
218#define __S010 PAGE_SHARED
219#define __S011 PAGE_SHARED
220#define __S100 PAGE_READONLY_EXEC
221#define __S101 PAGE_READONLY_EXEC
222#define __S110 PAGE_SHARED_EXEC
223#define __S111 PAGE_SHARED_EXEC
224
225static inline unsigned long pgd_bad(pgd_t pgd)
226{
227 unsigned long val = pgd_val(pgd);
228 val &= ~PTE_MASK;
229 val &= ~(_PAGE_USER | _PAGE_DIRTY);
230 return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
231}
232
233static inline unsigned long pud_bad(pud_t pud)
234{
235 unsigned long val = pud_val(pud);
236 val &= ~PTE_MASK;
237 val &= ~(_PAGE_USER | _PAGE_DIRTY);
238 return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
239}
240
241#define pte_none(x) (!pte_val(x))
242#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
243#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
244
245#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
246 right? */
247#define pte_page(x) pfn_to_page(pte_pfn(x))
248#define pte_pfn(x) ((pte_val(x) >> PAGE_SHIFT) & __PHYSICAL_MASK)
249
250static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
251{
252 pte_t pte;
253 pte_val(pte) = (page_nr << PAGE_SHIFT);
254 pte_val(pte) |= pgprot_val(pgprot);
255 pte_val(pte) &= __supported_pte_mask;
256 return pte;
257}
258
259/*
260 * The following only work if pte_present() is true.
261 * Undefined behaviour if not..
262 */
263#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
264static inline int pte_user(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
265extern inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
266extern inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
267extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
268extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
269extern inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
270static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
271static inline int pte_huge(pte_t pte) { return (pte_val(pte) & __LARGE_PTE) == __LARGE_PTE; }
272
273extern inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
274extern inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
275extern inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
276extern inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
277extern inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
278extern inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
279extern inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
280extern inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
281extern inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
282extern inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
283extern inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) | __LARGE_PTE)); return pte; }
284
285struct vm_area_struct;
286
287static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
288{
289 if (!pte_dirty(*ptep))
290 return 0;
291 return test_and_clear_bit(_PAGE_BIT_DIRTY, ptep);
292}
293
294static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
295{
296 if (!pte_young(*ptep))
297 return 0;
298 return test_and_clear_bit(_PAGE_BIT_ACCESSED, ptep);
299}
300
301static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
302{
303 clear_bit(_PAGE_BIT_RW, ptep);
304}
305
306/*
307 * Macro to mark a page protection value as "uncacheable".
308 */
309#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
310
311static inline int pmd_large(pmd_t pte) {
312 return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE;
313}
314
315
316/*
317 * Conversion functions: convert a page and protection to a page entry,
318 * and a page entry and page directory to the page they refer to.
319 */
320
321#define page_pte(page) page_pte_prot(page, __pgprot(0))
322
323/*
324 * Level 4 access.
325 */
326#define pgd_page(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
327#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
328#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
329#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
330#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
331#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
332
333/* PUD - Level3 access */
334/* to find an entry in a page-table-directory. */
335#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
336#define pud_offset(pgd, address) ((pud_t *) pgd_page(*(pgd)) + pud_index(address))
337#define pud_offset_k(pgd, addr) pud_offset(pgd, addr)
338#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
339
340static inline pud_t *__pud_offset_k(pud_t *pud, unsigned long address)
341{
342 return pud + pud_index(address);
343}
344
345/* PMD - Level 2 access */
346#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
347#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
348
349#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
350#define pmd_offset(dir, address) ((pmd_t *) pud_page(*(dir)) + \
351 pmd_index(address))
352#define pmd_none(x) (!pmd_val(x))
353#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
354#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
355#define pmd_bad(x) ((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
356#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
357#define pmd_pfn(x) ((pmd_val(x) >> PAGE_SHIFT) & __PHYSICAL_MASK)
358
359#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
360#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
361#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
362
363/* PTE - Level 1 access. */
364
365/* page, protection -> pte */
366#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
367#define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
368
369/* physical address -> PTE */
370static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
371{
372 pte_t pte;
373 pte_val(pte) = physpage | pgprot_val(pgprot);
374 return pte;
375}
376
377/* Change flags of a PTE */
378static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
379{
380 pte_val(pte) &= _PAGE_CHG_MASK;
381 pte_val(pte) |= pgprot_val(newprot);
382 pte_val(pte) &= __supported_pte_mask;
383 return pte;
384}
385
386#define pte_index(address) \
387 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
388#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_kernel(*(dir)) + \
389 pte_index(address))
390
391/* x86-64 always has all page tables mapped. */
392#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
393#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
394#define pte_unmap(pte) /* NOP */
395#define pte_unmap_nested(pte) /* NOP */
396
397#define update_mmu_cache(vma,address,pte) do { } while (0)
398
399/* We only update the dirty/accessed state if we set
400 * the dirty bit by hand in the kernel, since the hardware
401 * will do the accessed bit for us, and we don't want to
402 * race with other CPU's that might be updating the dirty
403 * bit at the same time. */
404#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
405#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
406 do { \
407 if (__dirty) { \
408 set_pte(__ptep, __entry); \
409 flush_tlb_page(__vma, __address); \
410 } \
411 } while (0)
412
413/* Encode and de-code a swap entry */
414#define __swp_type(x) (((x).val >> 1) & 0x3f)
415#define __swp_offset(x) ((x).val >> 8)
416#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
417#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
418#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
419
420#endif /* !__ASSEMBLY__ */
421
422extern int kern_addr_valid(unsigned long addr);
423
424#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
425 remap_pfn_range(vma, vaddr, pfn, size, prot)
426
427#define MK_IOSPACE_PFN(space, pfn) (pfn)
428#define GET_IOSPACE(pfn) 0
429#define GET_PFN(pfn) (pfn)
430
431#define HAVE_ARCH_UNMAPPED_AREA
432
433#define pgtable_cache_init() do { } while (0)
434#define check_pgt_cache() do { } while (0)
435
436#define PAGE_AGP PAGE_KERNEL_NOCACHE
437#define HAVE_PAGE_AGP 1
438
439/* fs/proc/kcore.c */
440#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
441#define kc_offset_to_vaddr(o) \
442 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
443
444#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
445#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
446#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
447#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
448#define __HAVE_ARCH_PTEP_SET_WRPROTECT
449#define __HAVE_ARCH_PTE_SAME
450#include <asm-generic/pgtable.h>
451
452#endif /* _X86_64_PGTABLE_H */