1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_3LEVEL_DEFS_H
3 #define _ASM_X86_PGTABLE_3LEVEL_DEFS_H
4 
5 #ifndef __ASSEMBLY__
6 #include <linux/types.h>
7 
8 typedef u64	pteval_t;
9 typedef u64	pmdval_t;
10 typedef u64	pudval_t;
11 typedef u64	p4dval_t;
12 typedef u64	pgdval_t;
13 typedef u64	pgprotval_t;
14 
15 typedef union {
16 	struct {
17 		unsigned long pte_low, pte_high;
18 	};
19 	pteval_t pte;
20 } pte_t;
21 
22 typedef union {
23 	struct {
24 		unsigned long pmd_low, pmd_high;
25 	};
26 	pmdval_t pmd;
27 } pmd_t;
28 #endif	/* !__ASSEMBLY__ */
29 
30 #define SHARED_KERNEL_PMD	(!static_cpu_has(X86_FEATURE_PTI))
31 
32 #define ARCH_PAGE_TABLE_SYNC_MASK	(SHARED_KERNEL_PMD ? 0 : PGTBL_PMD_MODIFIED)
33 
34 /*
35  * PGDIR_SHIFT determines what a top-level page table entry can map
36  */
37 #define PGDIR_SHIFT	30
38 #define PTRS_PER_PGD	4
39 
40 /*
41  * PMD_SHIFT determines the size of the area a middle-level
42  * page table can map
43  */
44 #define PMD_SHIFT	21
45 #define PTRS_PER_PMD	512
46 
47 /*
48  * entries per page directory level
49  */
50 #define PTRS_PER_PTE	512
51 
52 #define MAX_POSSIBLE_PHYSMEM_BITS	36
53 #define PGD_KERNEL_START	(CONFIG_PAGE_OFFSET >> PGDIR_SHIFT)
54 
55 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */
56