LXR linux/arch/x86/include/asm/pgtable_64

   1#ifndef _ASM_X86_PGTABLE_64_DEFS_H
   2#define _ASM_X86_PGTABLE_64_DEFS_H
   3
   4#include <asm/sparsemem.h>
   5
   6#ifndef __ASSEMBLY__
   7#include <linux/types.h>
   8
   9/*
  10 * These are used to make use of C type-checking..
  11 */
  12typedef unsigned long   pteval_t;
  13typedef unsigned long   pmdval_t;
  14typedef unsigned long   pudval_t;
  15typedef unsigned long   pgdval_t;
  16typedef unsigned long   pgprotval_t;
  17
  18typedef struct { pteval_t pte; } pte_t;
  19
  20#endif  /* !__ASSEMBLY__ */
  21
  22#define SHARED_KERNEL_PMD       0
  23#define PAGETABLE_LEVELS        4
  24
  25/*
  26 * PGDIR_SHIFT determines what a top-level page table entry can map
  27 */
  28#define PGDIR_SHIFT     39
  29#define PTRS_PER_PGD    512
  30
  31/*
  32 * 3rd level page
  33 */
  34#define PUD_SHIFT       30
  35#define PTRS_PER_PUD    512
  36
  37/*
  38 * PMD_SHIFT determines the size of the area a middle-level
  39 * page table can map
  40 */
  41#define PMD_SHIFT       21
  42#define PTRS_PER_PMD    512
  43
  44/*
  45 * entries per page directory level
  46 */
  47#define PTRS_PER_PTE    512
  48
  49#define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
  50#define PMD_MASK        (~(PMD_SIZE - 1))
  51#define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
  52#define PUD_MASK        (~(PUD_SIZE - 1))
  53#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  54#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  55
  56/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
  57#define MAXMEM           _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
  58#define VMALLOC_START    _AC(0xffffc90000000000, UL)
  59#define VMALLOC_END      _AC(0xffffe8ffffffffff, UL)
  60#define VMEMMAP_START    _AC(0xffffea0000000000, UL)
  61#define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
  62#define MODULES_END      _AC(0xffffffffff000000, UL)
  63#define MODULES_LEN   (MODULES_END - MODULES_VADDR)
  64
  65#define EARLY_DYNAMIC_PAGE_TABLES       64
  66
  67#endif /* _ASM_X86_PGTABLE_64_DEFS_H */
  68