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 */
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 #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 /*
143 * End of the region for which vmalloc page tables are pre-allocated.
144 * For non-KMSAN builds, this is the same as VMALLOC_END.
145 * For KMSAN builds, VMALLOC_START..VMEMORY_END is 4 times bigger than
146 * VMALLOC_START..VMALLOC_END (see below).
147 */
148 #define VMEMORY_END (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1)
149
150 #ifndef CONFIG_KMSAN
151 #define VMALLOC_END VMEMORY_END
152 #else
153 /*
154 * In KMSAN builds vmalloc area is four times smaller, and the remaining 3/4
155 * are used to keep the metadata for virtual pages. The memory formerly
156 * belonging to vmalloc area is now laid out as follows:
157 *
158 * 1st quarter: VMALLOC_START to VMALLOC_END - new vmalloc area
159 * 2nd quarter: KMSAN_VMALLOC_SHADOW_START to
160 * VMALLOC_END+KMSAN_VMALLOC_SHADOW_OFFSET - vmalloc area shadow
161 * 3rd quarter: KMSAN_VMALLOC_ORIGIN_START to
162 * VMALLOC_END+KMSAN_VMALLOC_ORIGIN_OFFSET - vmalloc area origins
163 * 4th quarter: KMSAN_MODULES_SHADOW_START to KMSAN_MODULES_ORIGIN_START
164 * - shadow for modules,
165 * KMSAN_MODULES_ORIGIN_START to
166 * KMSAN_MODULES_ORIGIN_START + MODULES_LEN - origins for modules.
167 */
168 #define VMALLOC_QUARTER_SIZE ((VMALLOC_SIZE_TB << 40) >> 2)
169 #define VMALLOC_END (VMALLOC_START + VMALLOC_QUARTER_SIZE - 1)
170
171 /*
172 * vmalloc metadata addresses are calculated by adding shadow/origin offsets
173 * to vmalloc address.
174 */
175 #define KMSAN_VMALLOC_SHADOW_OFFSET VMALLOC_QUARTER_SIZE
176 #define KMSAN_VMALLOC_ORIGIN_OFFSET (VMALLOC_QUARTER_SIZE << 1)
177
178 #define KMSAN_VMALLOC_SHADOW_START (VMALLOC_START + KMSAN_VMALLOC_SHADOW_OFFSET)
179 #define KMSAN_VMALLOC_ORIGIN_START (VMALLOC_START + KMSAN_VMALLOC_ORIGIN_OFFSET)
180
181 /*
182 * The shadow/origin for modules are placed one by one in the last 1/4 of
183 * vmalloc space.
184 */
185 #define KMSAN_MODULES_SHADOW_START (VMALLOC_END + KMSAN_VMALLOC_ORIGIN_OFFSET + 1)
186 #define KMSAN_MODULES_ORIGIN_START (KMSAN_MODULES_SHADOW_START + MODULES_LEN)
187 #endif /* CONFIG_KMSAN */
188
189 #define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
190 /* The module sections ends with the start of the fixmap */
191 #ifndef CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP
192 # define MODULES_END _AC(0xffffffffff000000, UL)
193 #else
194 # define MODULES_END _AC(0xfffffffffe000000, UL)
195 #endif
196 #define MODULES_LEN (MODULES_END - MODULES_VADDR)
197
198 #define ESPFIX_PGD_ENTRY _AC(-2, UL)
199 #define ESPFIX_BASE_ADDR (ESPFIX_PGD_ENTRY << P4D_SHIFT)
200
201 #define CPU_ENTRY_AREA_PGD _AC(-4, UL)
202 #define CPU_ENTRY_AREA_BASE (CPU_ENTRY_AREA_PGD << P4D_SHIFT)
203
204 #define EFI_VA_START ( -4 * (_AC(1, UL) << 30))
205 #define EFI_VA_END (-68 * (_AC(1, UL) << 30))
206
207 #define EARLY_DYNAMIC_PAGE_TABLES 64
208
209 #define PGD_KERNEL_START ((PAGE_SIZE / 2) / sizeof(pgd_t))
210
211 /*
212 * We borrow bit 3 to remember PG_anon_exclusive.
213 */
214 #define _PAGE_SWP_EXCLUSIVE _PAGE_PWT
215
216 #endif /* _ASM_X86_PGTABLE_64_DEFS_H */
217