1 #ifndef _X86_64_PGTABLE_H
2 #define _X86_64_PGTABLE_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 pgd_t init_level4_pgt[];
20
21 #define swapper_pg_dir init_level4_pgt
22
23 extern void paging_init(void);
24
25 #endif /* !__ASSEMBLY__ */
26
27 #define SHARED_KERNEL_PMD 1
28
29 /*
30 * PGDIR_SHIFT determines what a top-level page table entry can map
31 */
32 #define PGDIR_SHIFT 39
33 #define PTRS_PER_PGD 512
34
35 /*
36 * 3rd level page
37 */
38 #define PUD_SHIFT 30
39 #define PTRS_PER_PUD 512
40
41 /*
42 * PMD_SHIFT determines the size of the area a middle-level
43 * page table can map
44 */
45 #define PMD_SHIFT 21
46 #define PTRS_PER_PMD 512
47
48 /*
49 * entries per page directory level
50 */
51 #define PTRS_PER_PTE 512
52
53 #ifndef __ASSEMBLY__
54
55 #define pte_ERROR(e) \
56 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
57 #define pmd_ERROR(e) \
58 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
59 #define pud_ERROR(e) \
60 printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
61 #define pgd_ERROR(e) \
62 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
63
64 #define pgd_none(x) (!pgd_val(x))
65 #define pud_none(x) (!pud_val(x))
66
67 struct mm_struct;
68
69 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
70 pte_t *ptep)
71 {
72 *ptep = native_make_pte(0);
73 }
74
75 static inline void native_set_pte(pte_t *ptep, pte_t pte)
76 {
77 *ptep = pte;
78 }
79
80 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
81 {
82 native_set_pte(ptep, pte);
83 }
84
85 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
86 {
87 #ifdef CONFIG_SMP
88 return native_make_pte(xchg(&xp->pte, 0));
89 #else
90 /* native_local_ptep_get_and_clear, but duplicated because of cyclic dependency */
91 pte_t ret = *xp;
92 native_pte_clear(NULL, 0, xp);
93 return ret;
94 #endif
95 }
96
97 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
98 {
99 *pmdp = pmd;
100 }
101
102 static inline void native_pmd_clear(pmd_t *pmd)
103 {
104 native_set_pmd(pmd, native_make_pmd(0));
105 }
106
107 static inline void native_set_pud(pud_t *pudp, pud_t pud)
108 {
109 *pudp = pud;
110 }
111
112 static inline void native_pud_clear(pud_t *pud)
113 {
114 native_set_pud(pud, native_make_pud(0));
115 }
116
117 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
118 {
119 *pgdp = pgd;
120 }
121
122 static inline void native_pgd_clear(pgd_t * pgd)
123 {
124 native_set_pgd(pgd, native_make_pgd(0));
125 }
126
127 #define pte_same(a, b) ((a).pte == (b).pte)
128
129 #endif /* !__ASSEMBLY__ */
130
131 #define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
132 #define PMD_MASK (~(PMD_SIZE-1))
133 #define PUD_SIZE (_AC(1,UL) << PUD_SHIFT)
134 #define PUD_MASK (~(PUD_SIZE-1))
135 #define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
136 #define PGDIR_MASK (~(PGDIR_SIZE-1))
137
138
139 #define MAXMEM _AC(0x3fffffffffff, UL)
140 #define VMALLOC_START _AC(0xffffc20000000000, UL)
141 #define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
142 #define VMEMMAP_START _AC(0xffffe20000000000, UL)
143 #define MODULES_VADDR _AC(0xffffffff88000000, UL)
144 #define MODULES_END _AC(0xfffffffffff00000, UL)
145 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
146
147 #ifndef __ASSEMBLY__
148
149 static inline unsigned long pgd_bad(pgd_t pgd)
150 {
151 return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
152 }
153
154 static inline unsigned long pud_bad(pud_t pud)
155 {
156 return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
157 }
158
159 static inline unsigned long pmd_bad(pmd_t pmd)
160 {
161 return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
162 }
163
164 #define pte_none(x) (!pte_val(x))
165 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
166
167 #define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this right? */
168 #define pte_page(x) pfn_to_page(pte_pfn(x))
169 #define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
170
171 /*
172 * Macro to mark a page protection value as "uncacheable".
173 */
174 #define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
175
176
177 /*
178 * Conversion functions: convert a page and protection to a page entry,
179 * and a page entry and page directory to the page they refer to.
180 */
181
182 /*
183 * Level 4 access.
184 */
185 #define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
186 #define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
187 #define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
188 #define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
189 #define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
190 #define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
191 static inline int pgd_large(pgd_t pgd) { return 0; }
192 #define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
193
194 /* PUD - Level3 access */
195 /* to find an entry in a page-table-directory. */
196 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
197 #define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
198 #define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
199 #define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
200 #define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
201
202 static inline int pud_large(pud_t pte)
203 {
204 return (pud_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
205 (_PAGE_PSE|_PAGE_PRESENT);
206 }
207
208 /* PMD - Level 2 access */
209 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
210 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
211
212 #define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
213 #define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
214 pmd_index(address))
215 #define pmd_none(x) (!pmd_val(x))
216 #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
217 #define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
218 #define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
219
220 #define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
221 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | _PAGE_FILE })
222 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
223
224 /* PTE - Level 1 access. */
225
226 /* page, protection -> pte */
227 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
228
229 #define pte_index(address) \
230 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
231 #define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
232 pte_index(address))
233
234 /* x86-64 always has all page tables mapped. */
235 #define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
236 #define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
237 #define pte_unmap(pte) /* NOP */
238 #define pte_unmap_nested(pte) /* NOP */
239
240 #define update_mmu_cache(vma,address,pte) do { } while (0)
241
242 /* Encode and de-code a swap entry */
243 #define __swp_type(x) (((x).val >> 1) & 0x3f)
244 #define __swp_offset(x) ((x).val >> 8)
245 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
246 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
247 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
248
249 extern int kern_addr_valid(unsigned long addr);
250 extern void cleanup_highmap(void);
251
252 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
253 remap_pfn_range(vma, vaddr, pfn, size, prot)
254
255 #define HAVE_ARCH_UNMAPPED_AREA
256 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
257
258 #define pgtable_cache_init() do { } while (0)
259 #define check_pgt_cache() do { } while (0)
260
261 #define PAGE_AGP PAGE_KERNEL_NOCACHE
262 #define HAVE_PAGE_AGP 1
263
264 /* fs/proc/kcore.c */
265 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
266 #define kc_offset_to_vaddr(o) \
267 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
268
269 #define __HAVE_ARCH_PTE_SAME
270 #endif /* !__ASSEMBLY__ */
271
272 #endif /* _X86_64_PGTABLE_H */
273
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