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
8typedef u64	pteval_t;
9typedef u64	pmdval_t;
10typedef u64	pudval_t;
11typedef u64	p4dval_t;
12typedef u64	pgdval_t;
13typedef u64	pgprotval_t;
14
15typedef union {
16	struct {
17		unsigned long pte_low, pte_high;
18	};
19	pteval_t pte;
20} pte_t;
21
22typedef 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