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1 #ifndef _ASM_X86_PGTABLE_3LEVEL_DEFS_H
2 #define _ASM_X86_PGTABLE_3LEVEL_DEFS_H
3 
4 #ifndef __ASSEMBLY__
5 #include <linux/types.h>
6 
7 typedef u64	pteval_t;
8 typedef u64	pmdval_t;
9 typedef u64	pudval_t;
10 typedef u64	pgdval_t;
11 typedef u64	pgprotval_t;
12 
13 typedef union {
14 	struct {
15 		unsigned long pte_low, pte_high;
16 	};
17 	pteval_t pte;
18 } pte_t;
19 #endif	/* !__ASSEMBLY__ */
20 
21 #ifdef CONFIG_PARAVIRT
22 #define SHARED_KERNEL_PMD	(pv_info.shared_kernel_pmd)
23 #else
24 #define SHARED_KERNEL_PMD	1
25 #endif
26 
27 #define PAGETABLE_LEVELS	3
28 
29 /*
30  * PGDIR_SHIFT determines what a top-level page table entry can map
31  */
32 #define PGDIR_SHIFT	30
33 #define PTRS_PER_PGD	4
34 
35 /*
36  * PMD_SHIFT determines the size of the area a middle-level
37  * page table can map
38  */
39 #define PMD_SHIFT	21
40 #define PTRS_PER_PMD	512
41 
42 /*
43  * entries per page directory level
44  */
45 #define PTRS_PER_PTE	512
46 
47 
48 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */
49