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 typedef struct { pmdval_t pmd; } pmd_t; 23 24 #ifdef CONFIG_X86_5LEVEL 25 extern unsigned int __pgtable_l5_enabled; 26 27 #ifdef USE_EARLY_PGTABLE_L5 28 /* 29 * cpu_feature_enabled() is not available in early boot code. 30 * Use variable instead. 31 */ 32 static inline bool pgtable_l5_enabled(void) 33 { 34 return __pgtable_l5_enabled; 35 } 36 #else 37 #define pgtable_l5_enabled() cpu_feature_enabled(X86_FEATURE_LA57) 38 #endif /* USE_EARLY_PGTABLE_L5 */ 39 40 #else 41 #define pgtable_l5_enabled() 0 42 #endif /* CONFIG_X86_5LEVEL */ 43 44 extern unsigned int pgdir_shift; 45 extern unsigned int ptrs_per_p4d; 46 47 #endif /* !__ASSEMBLY__ */ 48 49 #define SHARED_KERNEL_PMD 0 50 51 #ifdef CONFIG_X86_5LEVEL 52 53 /* 54 * PGDIR_SHIFT determines what a top-level page table entry can map 55 */ 56 #define PGDIR_SHIFT pgdir_shift 57 #define PTRS_PER_PGD 512 58 59 /* 60 * 4th level page in 5-level paging case 61 */ 62 #define P4D_SHIFT 39 63 #define MAX_PTRS_PER_P4D 512 64 #define PTRS_PER_P4D ptrs_per_p4d 65 #define P4D_SIZE (_AC(1, UL) << P4D_SHIFT) 66 #define P4D_MASK (~(P4D_SIZE - 1)) 67 68 #define MAX_POSSIBLE_PHYSMEM_BITS 52 69 70 #else /* CONFIG_X86_5LEVEL */ 71 72 /* 73 * PGDIR_SHIFT determines what a top-level page table entry can map 74 */ 75 #define PGDIR_SHIFT 39 76 #define PTRS_PER_PGD 512 77 #define MAX_PTRS_PER_P4D 1 78 79 #endif /* CONFIG_X86_5LEVEL */ 80 81 /* 82 * 3rd level page 83 */ 84 #define PUD_SHIFT 30 85 #define PTRS_PER_PUD 512 86 87 /* 88 * PMD_SHIFT determines the size of the area a middle-level 89 * page table can map 90 */ 91 #define PMD_SHIFT 21 92 #define PTRS_PER_PMD 512 93 94 /* 95 * entries per page directory level 96 */ 97 #define PTRS_PER_PTE 512 98 99 #define PMD_SIZE (_AC(1, UL) << PMD_SHIFT) 100 #define PMD_MASK (~(PMD_SIZE - 1)) 101 #define PUD_SIZE (_AC(1, UL) << PUD_SHIFT) 102 #define PUD_MASK (~(PUD_SIZE - 1)) 103 #define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT) 104 #define PGDIR_MASK (~(PGDIR_SIZE - 1)) 105 106 /* 107 * See Documentation/x86/x86_64/mm.rst for a description of the memory map. 108 * 109 * Be very careful vs. KASLR when changing anything here. The KASLR address 110 * range must not overlap with anything except the KASAN shadow area, which 111 * is correct as KASAN disables KASLR. 112 */ 113 #define MAXMEM (1UL << MAX_PHYSMEM_BITS) 114 115 #define GUARD_HOLE_PGD_ENTRY -256UL 116 #define GUARD_HOLE_SIZE (16UL << PGDIR_SHIFT) 117 #define GUARD_HOLE_BASE_ADDR (GUARD_HOLE_PGD_ENTRY << PGDIR_SHIFT) 118 #define GUARD_HOLE_END_ADDR (GUARD_HOLE_BASE_ADDR + GUARD_HOLE_SIZE) 119 120 #define LDT_PGD_ENTRY -240UL 121 #define LDT_BASE_ADDR (LDT_PGD_ENTRY << PGDIR_SHIFT) 122 #define LDT_END_ADDR (LDT_BASE_ADDR + PGDIR_SIZE) 123 124 #define __VMALLOC_BASE_L4 0xffffc90000000000UL 125 #define __VMALLOC_BASE_L5 0xffa0000000000000UL 126 127 #define VMALLOC_SIZE_TB_L4 32UL 128 #define VMALLOC_SIZE_TB_L5 12800UL 129 130 #define __VMEMMAP_BASE_L4 0xffffea0000000000UL 131 #define __VMEMMAP_BASE_L5 0xffd4000000000000UL 132 133 #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT 134 # define VMALLOC_START vmalloc_base 135 # define VMALLOC_SIZE_TB (pgtable_l5_enabled() ? VMALLOC_SIZE_TB_L5 : VMALLOC_SIZE_TB_L4) 136 # define VMEMMAP_START vmemmap_base 137 #else 138 # define VMALLOC_START __VMALLOC_BASE_L4 139 # define VMALLOC_SIZE_TB VMALLOC_SIZE_TB_L4 140 # define VMEMMAP_START __VMEMMAP_BASE_L4 141 #endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */ 142 143 /* 144 * End of the region for which vmalloc page tables are pre-allocated. 145 * For non-KMSAN builds, this is the same as VMALLOC_END. 146 * For KMSAN builds, VMALLOC_START..VMEMORY_END is 4 times bigger than 147 * VMALLOC_START..VMALLOC_END (see below). 148 */ 149 #define VMEMORY_END (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1) 150 151 #ifndef CONFIG_KMSAN 152 #define VMALLOC_END VMEMORY_END 153 #else 154 /* 155 * In KMSAN builds vmalloc area is four times smaller, and the remaining 3/4 156 * are used to keep the metadata for virtual pages. The memory formerly 157 * belonging to vmalloc area is now laid out as follows: 158 * 159 * 1st quarter: VMALLOC_START to VMALLOC_END - new vmalloc area 160 * 2nd quarter: KMSAN_VMALLOC_SHADOW_START to 161 * VMALLOC_END+KMSAN_VMALLOC_SHADOW_OFFSET - vmalloc area shadow 162 * 3rd quarter: KMSAN_VMALLOC_ORIGIN_START to 163 * VMALLOC_END+KMSAN_VMALLOC_ORIGIN_OFFSET - vmalloc area origins 164 * 4th quarter: KMSAN_MODULES_SHADOW_START to KMSAN_MODULES_ORIGIN_START 165 * - shadow for modules, 166 * KMSAN_MODULES_ORIGIN_START to 167 * KMSAN_MODULES_ORIGIN_START + MODULES_LEN - origins for modules. 168 */ 169 #define VMALLOC_QUARTER_SIZE ((VMALLOC_SIZE_TB << 40) >> 2) 170 #define VMALLOC_END (VMALLOC_START + VMALLOC_QUARTER_SIZE - 1) 171 172 /* 173 * vmalloc metadata addresses are calculated by adding shadow/origin offsets 174 * to vmalloc address. 175 */ 176 #define KMSAN_VMALLOC_SHADOW_OFFSET VMALLOC_QUARTER_SIZE 177 #define KMSAN_VMALLOC_ORIGIN_OFFSET (VMALLOC_QUARTER_SIZE << 1) 178 179 #define KMSAN_VMALLOC_SHADOW_START (VMALLOC_START + KMSAN_VMALLOC_SHADOW_OFFSET) 180 #define KMSAN_VMALLOC_ORIGIN_START (VMALLOC_START + KMSAN_VMALLOC_ORIGIN_OFFSET) 181 182 /* 183 * The shadow/origin for modules are placed one by one in the last 1/4 of 184 * vmalloc space. 185 */ 186 #define KMSAN_MODULES_SHADOW_START (VMALLOC_END + KMSAN_VMALLOC_ORIGIN_OFFSET + 1) 187 #define KMSAN_MODULES_ORIGIN_START (KMSAN_MODULES_SHADOW_START + MODULES_LEN) 188 #endif /* CONFIG_KMSAN */ 189 190 #define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE) 191 /* The module sections ends with the start of the fixmap */ 192 #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP 193 # define MODULES_END _AC(0xffffffffff000000, UL) 194 #else 195 # define MODULES_END _AC(0xfffffffffe000000, UL) 196 #endif 197 #define MODULES_LEN (MODULES_END - MODULES_VADDR) 198 199 #define ESPFIX_PGD_ENTRY _AC(-2, UL) 200 #define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << P4D_SHIFT) 201 202 #define CPU_ENTRY_AREA_PGD _AC(-4, UL) 203 #define CPU_ENTRY_AREA_BASE (CPU_ENTRY_AREA_PGD << P4D_SHIFT) 204 205 #define EFI_VA_START ( -4 * (_AC(1, UL) << 30)) 206 #define EFI_VA_END (-68 * (_AC(1, UL) << 30)) 207 208 #define EARLY_DYNAMIC_PAGE_TABLES 64 209 210 #define PGD_KERNEL_START ((PAGE_SIZE / 2) / sizeof(pgd_t)) 211 212 /* 213 * We borrow bit 3 to remember PG_anon_exclusive. 214 */ 215 #define _PAGE_SWP_EXCLUSIVE _PAGE_PWT 216 217 #endif /* _ASM_X86_PGTABLE_64_DEFS_H */ 218