1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
4 #include <linux/const.h>
5 #include <asm/pgtable_64_types.h>
10 * This file contains the functions and defines necessary to modify and use
11 * the x86-64 page table tree.
13 #include <asm/processor.h>
14 #include <linux/bitops.h>
15 #include <linux/threads.h>
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 pte_t level1_fixmap_pgt
[512];
23 extern pgd_t init_level4_pgt
[];
25 #define swapper_pg_dir init_level4_pgt
27 extern void paging_init(void);
29 #define pte_ERROR(e) \
30 pr_err("%s:%d: bad pte %p(%016lx)\n", \
31 __FILE__, __LINE__, &(e), pte_val(e))
32 #define pmd_ERROR(e) \
33 pr_err("%s:%d: bad pmd %p(%016lx)\n", \
34 __FILE__, __LINE__, &(e), pmd_val(e))
35 #define pud_ERROR(e) \
36 pr_err("%s:%d: bad pud %p(%016lx)\n", \
37 __FILE__, __LINE__, &(e), pud_val(e))
38 #define pgd_ERROR(e) \
39 pr_err("%s:%d: bad pgd %p(%016lx)\n", \
40 __FILE__, __LINE__, &(e), pgd_val(e))
44 void set_pte_vaddr_pud(pud_t
*pud_page
, unsigned long vaddr
, pte_t new_pte
);
47 static inline void native_pte_clear(struct mm_struct
*mm
, unsigned long addr
,
50 *ptep
= native_make_pte(0);
53 static inline void native_set_pte(pte_t
*ptep
, pte_t pte
)
58 static inline void native_set_pte_atomic(pte_t
*ptep
, pte_t pte
)
60 native_set_pte(ptep
, pte
);
63 static inline void native_set_pmd(pmd_t
*pmdp
, pmd_t pmd
)
68 static inline void native_pmd_clear(pmd_t
*pmd
)
70 native_set_pmd(pmd
, native_make_pmd(0));
73 static inline pte_t
native_ptep_get_and_clear(pte_t
*xp
)
76 return native_make_pte(xchg(&xp
->pte
, 0));
78 /* native_local_ptep_get_and_clear,
79 but duplicated because of cyclic dependency */
81 native_pte_clear(NULL
, 0, xp
);
86 static inline pmd_t
native_pmdp_get_and_clear(pmd_t
*xp
)
89 return native_make_pmd(xchg(&xp
->pmd
, 0));
91 /* native_local_pmdp_get_and_clear,
92 but duplicated because of cyclic dependency */
99 static inline void native_set_pud(pud_t
*pudp
, pud_t pud
)
104 static inline void native_pud_clear(pud_t
*pud
)
106 native_set_pud(pud
, native_make_pud(0));
109 static inline pud_t
native_pudp_get_and_clear(pud_t
*xp
)
112 return native_make_pud(xchg(&xp
->pud
, 0));
114 /* native_local_pudp_get_and_clear,
115 * but duplicated because of cyclic dependency
119 native_pud_clear(xp
);
124 static inline void native_set_pgd(pgd_t
*pgdp
, pgd_t pgd
)
129 static inline void native_pgd_clear(pgd_t
*pgd
)
131 native_set_pgd(pgd
, native_make_pgd(0));
134 extern void sync_global_pgds(unsigned long start
, unsigned long end
);
137 * Conversion functions: convert a page and protection to a page entry,
138 * and a page entry and page directory to the page they refer to.
144 static inline int pgd_large(pgd_t pgd
) { return 0; }
145 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
147 /* PUD - Level3 access */
149 /* PMD - Level 2 access */
151 /* PTE - Level 1 access. */
153 /* x86-64 always has all page tables mapped. */
154 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
155 #define pte_unmap(pte) ((void)(pte))/* NOP */
158 * Encode and de-code a swap entry
160 * | ... | 11| 10| 9|8|7|6|5| 4| 3|2|1|0| <- bit number
161 * | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U|W|P| <- bit names
162 * | OFFSET (14->63) | TYPE (9-13) |0|X|X|X| X| X|X|X|0| <- swp entry
164 * G (8) is aliased and used as a PROT_NONE indicator for
165 * !present ptes. We need to start storing swap entries above
166 * there. We also need to avoid using A and D because of an
167 * erratum where they can be incorrectly set by hardware on
170 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
171 #define SWP_TYPE_BITS 5
172 /* Place the offset above the type: */
173 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
175 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
177 #define __swp_type(x) (((x).val >> (SWP_TYPE_FIRST_BIT)) \
178 & ((1U << SWP_TYPE_BITS) - 1))
179 #define __swp_offset(x) ((x).val >> SWP_OFFSET_FIRST_BIT)
180 #define __swp_entry(type, offset) ((swp_entry_t) { \
181 ((type) << (SWP_TYPE_FIRST_BIT)) \
182 | ((offset) << SWP_OFFSET_FIRST_BIT) })
183 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
184 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
186 extern int kern_addr_valid(unsigned long addr
);
187 extern void cleanup_highmap(void);
189 #define HAVE_ARCH_UNMAPPED_AREA
190 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
192 #define pgtable_cache_init() do { } while (0)
193 #define check_pgt_cache() do { } while (0)
195 #define PAGE_AGP PAGE_KERNEL_NOCACHE
196 #define HAVE_PAGE_AGP 1
198 /* fs/proc/kcore.c */
199 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
200 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
202 #define __HAVE_ARCH_PTE_SAME
204 #define vmemmap ((struct page *)VMEMMAP_START)
206 extern void init_extra_mapping_uc(unsigned long phys
, unsigned long size
);
207 extern void init_extra_mapping_wb(unsigned long phys
, unsigned long size
);
209 #endif /* !__ASSEMBLY__ */
211 #endif /* _ASM_X86_PGTABLE_64_H */