pgtable-3level_types.h

Go to the documentation of this file.

#ifndef _ASM_X86_PGTABLE_3LEVEL_DEFS_H
#define _ASM_X86_PGTABLE_3LEVEL_DEFS_H

#ifndef __ASSEMBLY__
#include <linux/types.h>

typedef u64 pteval_t;
typedef u64 pmdval_t;
typedef u64 pudval_t;
typedef u64 pgdval_t;
typedef u64 pgprotval_t;

typedef union {
    struct {
        unsigned long pte_low, pte_high;
    };
    pteval_t pte;
} pte_t;
#endif  /* !__ASSEMBLY__ */

#ifdef CONFIG_PARAVIRT
#define SHARED_KERNEL_PMD   (pv_info.shared_kernel_pmd)
#else
#define SHARED_KERNEL_PMD   1
#endif

#define PAGETABLE_LEVELS    3

/*
 * PGDIR_SHIFT determines what a top-level page table entry can map
 */
#define PGDIR_SHIFT 30
#define PTRS_PER_PGD    4

/*
 * PMD_SHIFT determines the size of the area a middle-level
 * page table can map
 */
#define PMD_SHIFT   21
#define PTRS_PER_PMD    512

/*
 * entries per page directory level
 */
#define PTRS_PER_PTE    512


#endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */