pgtable-3level_types.h

 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 __ASSEMBLER__
 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	/* !__ASSEMBLER__ */
29
30#define ARCH_PAGE_TABLE_SYNC_MASK	PGTBL_PMD_MODIFIED
31
32/*
33 * PGDIR_SHIFT determines what a top-level page table entry can map
34 */
35#define PGDIR_SHIFT	30
36#define PTRS_PER_PGD	4
37
38/*
39 * PMD_SHIFT determines the size of the area a middle-level
40 * page table can map
41 */
42#define PMD_SHIFT	21
43#define PTRS_PER_PMD	512
44
45/*
46 * entries per page directory level
47 */
48#define PTRS_PER_PTE	512
49
50#define MAX_POSSIBLE_PHYSMEM_BITS	36
51#define PGD_KERNEL_START	(CONFIG_PAGE_OFFSET >> PGDIR_SHIFT)
52
53#endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */