1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
3
4 #include <linux/const.h>
5 #ifndef __ASSEMBLY__
6
7 /*
8 * This file contains the functions and defines necessary to modify and use
9 * the x86-64 page table tree.
10 */
11 #include <asm/processor.h>
12 #include <linux/bitops.h>
13 #include <linux/threads.h>
14 #include <asm/pda.h>
15
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 pmd_t level2_fixmap_pgt[512];
20 extern pmd_t level2_ident_pgt[512];
21 extern pgd_t init_level4_pgt[];
22
23 #define swapper_pg_dir init_level4_pgt
24
25 extern void paging_init(void);
26
27 #endif /* !__ASSEMBLY__ */
28
29 #define SHARED_KERNEL_PMD 0
30
31 /*
32 * PGDIR_SHIFT determines what a top-level page table entry can map
33 */
34 #define PGDIR_SHIFT 39
35 #define PTRS_PER_PGD 512
36
37 /*
38 * 3rd level page
39 */
40 #define PUD_SHIFT 30
41 #define PTRS_PER_PUD 512
42
43 /*
44 * PMD_SHIFT determines the size of the area a middle-level
45 * page table can map
46 */
47 #define PMD_SHIFT 21
48 #define PTRS_PER_PMD 512
49
50 /*
51 * entries per page directory level
52 */
53 #define PTRS_PER_PTE 512
54
55 #ifndef __ASSEMBLY__
56
57 #define pte_ERROR(e) \
58 printk("%s:%d: bad pte %p(%016lx).\n", \
59 __FILE__, __LINE__, &(e), pte_val(e))
60 #define pmd_ERROR(e) \
61 printk("%s:%d: bad pmd %p(%016lx).\n", \
62 __FILE__, __LINE__, &(e), pmd_val(e))
63 #define pud_ERROR(e) \
64 printk("%s:%d: bad pud %p(%016lx).\n", \
65 __FILE__, __LINE__, &(e), pud_val(e))
66 #define pgd_ERROR(e) \
67 printk("%s:%d: bad pgd %p(%016lx).\n", \
68 __FILE__, __LINE__, &(e), pgd_val(e))
69
70 #define pgd_none(x) (!pgd_val(x))
71 #define pud_none(x) (!pud_val(x))
72
73 struct mm_struct;
74
75 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
76
77
native_pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)78 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
79 pte_t *ptep)
80 {
81 *ptep = native_make_pte(0);
82 }
83
native_set_pte(pte_t * ptep,pte_t pte)84 static inline void native_set_pte(pte_t *ptep, pte_t pte)
85 {
86 *ptep = pte;
87 }
88
native_set_pte_atomic(pte_t * ptep,pte_t pte)89 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
90 {
91 native_set_pte(ptep, pte);
92 }
93
native_ptep_get_and_clear(pte_t * xp)94 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
95 {
96 #ifdef CONFIG_SMP
97 return native_make_pte(xchg(&xp->pte, 0));
98 #else
99 /* native_local_ptep_get_and_clear,
100 but duplicated because of cyclic dependency */
101 pte_t ret = *xp;
102 native_pte_clear(NULL, 0, xp);
103 return ret;
104 #endif
105 }
106
native_set_pmd(pmd_t * pmdp,pmd_t pmd)107 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
108 {
109 *pmdp = pmd;
110 }
111
native_pmd_clear(pmd_t * pmd)112 static inline void native_pmd_clear(pmd_t *pmd)
113 {
114 native_set_pmd(pmd, native_make_pmd(0));
115 }
116
native_set_pud(pud_t * pudp,pud_t pud)117 static inline void native_set_pud(pud_t *pudp, pud_t pud)
118 {
119 *pudp = pud;
120 }
121
native_pud_clear(pud_t * pud)122 static inline void native_pud_clear(pud_t *pud)
123 {
124 native_set_pud(pud, native_make_pud(0));
125 }
126
native_set_pgd(pgd_t * pgdp,pgd_t pgd)127 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
128 {
129 *pgdp = pgd;
130 }
131
native_pgd_clear(pgd_t * pgd)132 static inline void native_pgd_clear(pgd_t *pgd)
133 {
134 native_set_pgd(pgd, native_make_pgd(0));
135 }
136
137 #define pte_same(a, b) ((a).pte == (b).pte)
138
139 #endif /* !__ASSEMBLY__ */
140
141 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
142 #define PMD_MASK (~(PMD_SIZE - 1))
143 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
144 #define PUD_MASK (~(PUD_SIZE - 1))
145 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
146 #define PGDIR_MASK (~(PGDIR_SIZE - 1))
147
148
149 #define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
150 #define VMALLOC_START _AC(0xffffc20000000000, UL)
151 #define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
152 #define VMEMMAP_START _AC(0xffffe20000000000, UL)
153 #define MODULES_VADDR _AC(0xffffffffa0000000, UL)
154 #define MODULES_END _AC(0xffffffffff000000, UL)
155 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
156
157 #ifndef __ASSEMBLY__
158
pgd_bad(pgd_t pgd)159 static inline int pgd_bad(pgd_t pgd)
160 {
161 return (pgd_val(pgd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
162 }
163
pud_bad(pud_t pud)164 static inline int pud_bad(pud_t pud)
165 {
166 return (pud_val(pud) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
167 }
168
pmd_bad(pmd_t pmd)169 static inline int pmd_bad(pmd_t pmd)
170 {
171 return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
172 }
173
174 #define pte_none(x) (!pte_val((x)))
175 #define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
176
177 #define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
178
179 /*
180 * Conversion functions: convert a page and protection to a page entry,
181 * and a page entry and page directory to the page they refer to.
182 */
183
184 /*
185 * Level 4 access.
186 */
187 #define pgd_page_vaddr(pgd) \
188 ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_PFN_MASK))
189 #define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
190 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
pgd_large(pgd_t pgd)191 static inline int pgd_large(pgd_t pgd) { return 0; }
192 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
193
194 /* PUD - Level3 access */
195 /* to find an entry in a page-table-directory. */
196 #define pud_page_vaddr(pud) \
197 ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
198 #define pud_page(pud) (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
199 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
200 #define pud_offset(pgd, address) \
201 ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
202 #define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
203
pud_large(pud_t pte)204 static inline int pud_large(pud_t pte)
205 {
206 return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
207 (_PAGE_PSE | _PAGE_PRESENT);
208 }
209
210 /* PMD - Level 2 access */
211 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_PFN_MASK))
212 #define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
213
214 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
215 #define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
216 pmd_index(address))
217 #define pmd_none(x) (!pmd_val((x)))
218 #define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT)
219 #define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
220 #define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
221
222 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
223 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
224 _PAGE_FILE })
225 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
226
227 /* PTE - Level 1 access. */
228
229 /* page, protection -> pte */
230 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn((page)), (pgprot))
231
232 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
233 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
234 pte_index((address)))
235
236 /* x86-64 always has all page tables mapped. */
237 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
238 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
239 #define pte_unmap(pte) /* NOP */
240 #define pte_unmap_nested(pte) /* NOP */
241
242 #define update_mmu_cache(vma, address, pte) do { } while (0)
243
244 extern int direct_gbpages;
245
246 /* Encode and de-code a swap entry */
247 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
248 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
249 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
250 #else
251 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
252 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
253 #endif
254
255 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
256
257 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
258 & ((1U << SWP_TYPE_BITS) - 1))
259 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
260 #define __swp_entry(type, offset) ((swp_entry_t) { \
261 ((type) << (_PAGE_BIT_PRESENT + 1)) \
262 | ((offset) << SWP_OFFSET_SHIFT) })
263 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
264 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
265
266 extern int kern_addr_valid(unsigned long addr);
267 extern void cleanup_highmap(void);
268
269 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
270 remap_pfn_range(vma, vaddr, pfn, size, prot)
271
272 #define HAVE_ARCH_UNMAPPED_AREA
273 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
274
275 #define pgtable_cache_init() do { } while (0)
276 #define check_pgt_cache() do { } while (0)
277
278 #define PAGE_AGP PAGE_KERNEL_NOCACHE
279 #define HAVE_PAGE_AGP 1
280
281 /* fs/proc/kcore.c */
282 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
283 #define kc_offset_to_vaddr(o) \
284 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
285 ? ((o) | ~__VIRTUAL_MASK) \
286 : (o))
287
288 #define __HAVE_ARCH_PTE_SAME
289 #endif /* !__ASSEMBLY__ */
290
291 #endif /* _ASM_X86_PGTABLE_64_H */
292