root/arch/x86/include/asm/pgtable_64_types.h

INCLUDED FROM

DEFINITIONS

1. pgtable_l5_enabled

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_PGTABLE_64_DEFS_H
   3 #define _ASM_X86_PGTABLE_64_DEFS_H
   4 
   5 #include <asm/sparsemem.h>
   6 
   7 #ifndef __ASSEMBLY__
   8 #include <linux/types.h>
   9 #include <asm/kaslr.h>
  10 
  11 /*
  12  * These are used to make use of C type-checking..
  13  */
  14 typedef unsigned long   pteval_t;
  15 typedef unsigned long   pmdval_t;
  16 typedef unsigned long   pudval_t;
  17 typedef unsigned long   p4dval_t;
  18 typedef unsigned long   pgdval_t;
  19 typedef unsigned long   pgprotval_t;
  20 
  21 typedef struct { pteval_t pte; } pte_t;
  22 
  23 #ifdef CONFIG_X86_5LEVEL
  24 extern unsigned int __pgtable_l5_enabled;
  25 
  26 #ifdef USE_EARLY_PGTABLE_L5
  27 /*
  28  * cpu_feature_enabled() is not available in early boot code.
  29  * Use variable instead.
  30  */
  31 static inline bool pgtable_l5_enabled(void)
  32 {
  33         return __pgtable_l5_enabled;
  34 }
  35 #else
  36 #define pgtable_l5_enabled() cpu_feature_enabled(X86_FEATURE_LA57)
  37 #endif /* USE_EARLY_PGTABLE_L5 */
  38 
  39 #else
  40 #define pgtable_l5_enabled() 0
  41 #endif /* CONFIG_X86_5LEVEL */
  42 
  43 extern unsigned int pgdir_shift;
  44 extern unsigned int ptrs_per_p4d;
  45 
  46 #endif  /* !__ASSEMBLY__ */
  47 
  48 #define SHARED_KERNEL_PMD       0
  49 
  50 #ifdef CONFIG_X86_5LEVEL
  51 
  52 /*
  53  * PGDIR_SHIFT determines what a top-level page table entry can map
  54  */
  55 #define PGDIR_SHIFT     pgdir_shift
  56 #define PTRS_PER_PGD    512
  57 
  58 /*
  59  * 4th level page in 5-level paging case
  60  */
  61 #define P4D_SHIFT               39
  62 #define MAX_PTRS_PER_P4D        512
  63 #define PTRS_PER_P4D            ptrs_per_p4d
  64 #define P4D_SIZE                (_AC(1, UL) << P4D_SHIFT)
  65 #define P4D_MASK                (~(P4D_SIZE - 1))
  66 
  67 #define MAX_POSSIBLE_PHYSMEM_BITS       52
  68 
  69 #else /* CONFIG_X86_5LEVEL */
  70 
  71 /*
  72  * PGDIR_SHIFT determines what a top-level page table entry can map
  73  */
  74 #define PGDIR_SHIFT             39
  75 #define PTRS_PER_PGD            512
  76 #define MAX_PTRS_PER_P4D        1
  77 
  78 #endif /* CONFIG_X86_5LEVEL */
  79 
  80 /*
  81  * 3rd level page
  82  */
  83 #define PUD_SHIFT       30
  84 #define PTRS_PER_PUD    512
  85 
  86 /*
  87  * PMD_SHIFT determines the size of the area a middle-level
  88  * page table can map
  89  */
  90 #define PMD_SHIFT       21
  91 #define PTRS_PER_PMD    512
  92 
  93 /*
  94  * entries per page directory level
  95  */
  96 #define PTRS_PER_PTE    512
  97 
  98 #define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
  99 #define PMD_MASK        (~(PMD_SIZE - 1))
 100 #define PUD_SIZE        (_AC(1, UL) << PUD_SHIFT)
 101 #define PUD_MASK        (~(PUD_SIZE - 1))
 102 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
 103 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
 104 
 105 /*
 106  * See Documentation/x86/x86_64/mm.rst for a description of the memory map.
 107  *
 108  * Be very careful vs. KASLR when changing anything here. The KASLR address
 109  * range must not overlap with anything except the KASAN shadow area, which
 110  * is correct as KASAN disables KASLR.
 111  */
 112 #define MAXMEM                  (1UL << MAX_PHYSMEM_BITS)
 113 
 114 #define GUARD_HOLE_PGD_ENTRY    -256UL
 115 #define GUARD_HOLE_SIZE         (16UL << PGDIR_SHIFT)
 116 #define GUARD_HOLE_BASE_ADDR    (GUARD_HOLE_PGD_ENTRY << PGDIR_SHIFT)
 117 #define GUARD_HOLE_END_ADDR     (GUARD_HOLE_BASE_ADDR + GUARD_HOLE_SIZE)
 118 
 119 #define LDT_PGD_ENTRY           -240UL
 120 #define LDT_BASE_ADDR           (LDT_PGD_ENTRY << PGDIR_SHIFT)
 121 #define LDT_END_ADDR            (LDT_BASE_ADDR + PGDIR_SIZE)
 122 
 123 #define __VMALLOC_BASE_L4       0xffffc90000000000UL
 124 #define __VMALLOC_BASE_L5       0xffa0000000000000UL
 125 
 126 #define VMALLOC_SIZE_TB_L4      32UL
 127 #define VMALLOC_SIZE_TB_L5      12800UL
 128 
 129 #define __VMEMMAP_BASE_L4       0xffffea0000000000UL
 130 #define __VMEMMAP_BASE_L5       0xffd4000000000000UL
 131 
 132 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
 133 # define VMALLOC_START          vmalloc_base
 134 # define VMALLOC_SIZE_TB        (pgtable_l5_enabled() ? VMALLOC_SIZE_TB_L5 : VMALLOC_SIZE_TB_L4)
 135 # define VMEMMAP_START          vmemmap_base
 136 #else
 137 # define VMALLOC_START          __VMALLOC_BASE_L4
 138 # define VMALLOC_SIZE_TB        VMALLOC_SIZE_TB_L4
 139 # define VMEMMAP_START          __VMEMMAP_BASE_L4
 140 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
 141 
 142 #define VMALLOC_END             (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1)
 143 
 144 #define MODULES_VADDR           (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
 145 /* The module sections ends with the start of the fixmap */
 146 #define MODULES_END             _AC(0xffffffffff000000, UL)
 147 #define MODULES_LEN             (MODULES_END - MODULES_VADDR)
 148 
 149 #define ESPFIX_PGD_ENTRY        _AC(-2, UL)
 150 #define ESPFIX_BASE_ADDR        (ESPFIX_PGD_ENTRY << P4D_SHIFT)
 151 
 152 #define CPU_ENTRY_AREA_PGD      _AC(-4, UL)
 153 #define CPU_ENTRY_AREA_BASE     (CPU_ENTRY_AREA_PGD << P4D_SHIFT)
 154 
 155 #define EFI_VA_START            ( -4 * (_AC(1, UL) << 30))
 156 #define EFI_VA_END              (-68 * (_AC(1, UL) << 30))
 157 
 158 #define EARLY_DYNAMIC_PAGE_TABLES       64
 159 
 160 #define PGD_KERNEL_START        ((PAGE_SIZE / 2) / sizeof(pgd_t))
 161 
 162 #endif /* _ASM_X86_PGTABLE_64_DEFS_H */