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.txt 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 LDT_PGD_ENTRY_L4 -3UL 115 #define LDT_PGD_ENTRY_L5 -112UL 116 #define LDT_PGD_ENTRY (pgtable_l5_enabled() ? LDT_PGD_ENTRY_L5 : LDT_PGD_ENTRY_L4) 117 #define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) 118 #define LDT_END_ADDR (LDT_BASE_ADDR + PGDIR_SIZE) 119 120 #define __VMALLOC_BASE_L4 0xffffc90000000000UL 121 #define __VMALLOC_BASE_L5 0xffa0000000000000UL 122 123 #define VMALLOC_SIZE_TB_L4 32UL 124 #define VMALLOC_SIZE_TB_L5 12800UL 125 126 #define __VMEMMAP_BASE_L4 0xffffea0000000000UL 127 #define __VMEMMAP_BASE_L5 0xffd4000000000000UL 128 129 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT 130 # define VMALLOC_START vmalloc_base 131 # define VMALLOC_SIZE_TB (pgtable_l5_enabled() ? VMALLOC_SIZE_TB_L5 : VMALLOC_SIZE_TB_L4) 132 # define VMEMMAP_START vmemmap_base 133 #else 134 # define VMALLOC_START __VMALLOC_BASE_L4 135 # define VMALLOC_SIZE_TB VMALLOC_SIZE_TB_L4 136 # define VMEMMAP_START __VMEMMAP_BASE_L4 137 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ 138 139 #define VMALLOC_END (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1) 140 141 #define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE) 142 /* The module sections ends with the start of the fixmap */ 143 #define MODULES_END _AC(0xffffffffff000000, UL) 144 #define MODULES_LEN (MODULES_END - MODULES_VADDR) 145 146 #define ESPFIX_PGD_ENTRY _AC(-2, UL) 147 #define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << P4D_SHIFT) 148 149 #define CPU_ENTRY_AREA_PGD _AC(-4, UL) 150 #define CPU_ENTRY_AREA_BASE (CPU_ENTRY_AREA_PGD << P4D_SHIFT) 151 152 #define EFI_VA_START ( -4 * (_AC(1, UL) << 30)) 153 #define EFI_VA_END (-68 * (_AC(1, UL) << 30)) 154 155 #define EARLY_DYNAMIC_PAGE_TABLES 64 156 157 #define PGD_KERNEL_START ((PAGE_SIZE / 2) / sizeof(pgd_t)) 158 159 #endif /* _ASM_X86_PGTABLE_64_DEFS_H */ 160