pgtable-3level-defs.h

来自「linux 内核源代码」· C头文件 代码 · 共 29 行

#ifndef _I386_PGTABLE_3LEVEL_DEFS_H
#define _I386_PGTABLE_3LEVEL_DEFS_H

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

/*
 * 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 /* _I386_PGTABLE_3LEVEL_DEFS_H */