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