1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
3
4 #include <linux/const.h>
5 #include <asm/pgtable_64_types.h>
6
7 #ifndef __ASSEMBLY__
8
9 /*
10 * This file contains the functions and defines necessary to modify and use
11 * the x86-64 page table tree.
12 */
13 #include <asm/processor.h>
14 #include <linux/bitops.h>
15 #include <linux/threads.h>
16
17 extern pud_t level3_kernel_pgt[512];
18 extern pud_t level3_ident_pgt[512];
19 extern pmd_t level2_kernel_pgt[512];
20 extern pmd_t level2_fixmap_pgt[512];
21 extern pmd_t level2_ident_pgt[512];
22 extern pgd_t init_level4_pgt[];
23
24 #define swapper_pg_dir init_level4_pgt
25
26 extern void paging_init(void);
27
28 #define pte_ERROR(e) \
29 printk("%s:%d: bad pte %p(%016lx).\n", \
30 __FILE__, __LINE__, &(e), pte_val(e))
31 #define pmd_ERROR(e) \
32 printk("%s:%d: bad pmd %p(%016lx).\n", \
33 __FILE__, __LINE__, &(e), pmd_val(e))
34 #define pud_ERROR(e) \
35 printk("%s:%d: bad pud %p(%016lx).\n", \
36 __FILE__, __LINE__, &(e), pud_val(e))
37 #define pgd_ERROR(e) \
38 printk("%s:%d: bad pgd %p(%016lx).\n", \
39 __FILE__, __LINE__, &(e), pgd_val(e))
40
41 struct mm_struct;
42
43 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
44
45
46 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
47 pte_t *ptep)
48 {
49 *ptep = native_make_pte(0);
50 }
51
52 static inline void native_set_pte(pte_t *ptep, pte_t pte)
53 {
54 *ptep = pte;
55 }
56
57 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
58 {
59 native_set_pte(ptep, pte);
60 }
61
62 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
63 {
64 #ifdef CONFIG_SMP
65 return native_make_pte(xchg(&xp->pte, 0));
66 #else
67 /* native_local_ptep_get_and_clear,
68 but duplicated because of cyclic dependency */
69 pte_t ret = *xp;
70 native_pte_clear(NULL, 0, xp);
71 return ret;
72 #endif
73 }
74
75 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
76 {
77 *pmdp = pmd;
78 }
79
80 static inline void native_pmd_clear(pmd_t *pmd)
81 {
82 native_set_pmd(pmd, native_make_pmd(0));
83 }
84
85 static inline void native_set_pud(pud_t *pudp, pud_t pud)
86 {
87 *pudp = pud;
88 }
89
90 static inline void native_pud_clear(pud_t *pud)
91 {
92 native_set_pud(pud, native_make_pud(0));
93 }
94
95 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
96 {
97 *pgdp = pgd;
98 }
99
100 static inline void native_pgd_clear(pgd_t *pgd)
101 {
102 native_set_pgd(pgd, native_make_pgd(0));
103 }
104
105 /*
106 * Conversion functions: convert a page and protection to a page entry,
107 * and a page entry and page directory to the page they refer to.
108 */
109
110 /*
111 * Level 4 access.
112 */
113 static inline int pgd_large(pgd_t pgd) { return 0; }
114 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
115
116 /* PUD - Level3 access */
117
118 /* PMD - Level 2 access */
119 #define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
120 #define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
121 _PAGE_FILE })
122 #define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
123
124 /* PTE - Level 1 access. */
125
126 /* x86-64 always has all page tables mapped. */
127 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
128 #define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
129 #define pte_unmap(pte) /* NOP */
130 #define pte_unmap_nested(pte) /* NOP */
131
132 #define update_mmu_cache(vma, address, pte) do { } while (0)
133
134 /* Encode and de-code a swap entry */
135 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
136 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
137 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
138 #else
139 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
140 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
141 #endif
142
143 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
144
145 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
146 & ((1U << SWP_TYPE_BITS) - 1))
147 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
148 #define __swp_entry(type, offset) ((swp_entry_t) { \
149 ((type) << (_PAGE_BIT_PRESENT + 1)) \
150 | ((offset) << SWP_OFFSET_SHIFT) })
151 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
152 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
153
154 extern int kern_addr_valid(unsigned long addr);
155 extern void cleanup_highmap(void);
156
157 #define HAVE_ARCH_UNMAPPED_AREA
158 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
159
160 #define pgtable_cache_init() do { } while (0)
161 #define check_pgt_cache() do { } while (0)
162
163 #define PAGE_AGP PAGE_KERNEL_NOCACHE
164 #define HAVE_PAGE_AGP 1
165
166 /* fs/proc/kcore.c */
167 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
168 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
169
170 #define __HAVE_ARCH_PTE_SAME
171 #endif /* !__ASSEMBLY__ */
172
173 #endif /* _ASM_X86_PGTABLE_64_H */
174
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