1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
3
4 #include <linux/const.h>
5 #include <asm/pgtable_64_types.h>
6
7 #ifndef __ASSEMBLY__
8
9 /*
10 * This file contains the functions and defines necessary to modify and use
11 * the x86-64 page table tree.
12 */
13 #include <asm/processor.h>
14 #include <linux/bitops.h>
15 #include <linux/threads.h>
16
17 extern pud_t level3_kernel_pgt[512];
18 extern pud_t level3_ident_pgt[512];
19 extern pmd_t level2_kernel_pgt[512];
20 extern pmd_t level2_fixmap_pgt[512];
21 extern pmd_t level2_ident_pgt[512];
22 extern pte_t level1_fixmap_pgt[512];
23 extern pgd_t init_level4_pgt[];
24
25 #define swapper_pg_dir init_level4_pgt
26
27 extern void paging_init(void);
28
29 #define pte_ERROR(e) \
30 pr_err("%s:%d: bad pte %p(%016lx)\n", \
31 __FILE__, __LINE__, &(e), pte_val(e))
32 #define pmd_ERROR(e) \
33 pr_err("%s:%d: bad pmd %p(%016lx)\n", \
34 __FILE__, __LINE__, &(e), pmd_val(e))
35 #define pud_ERROR(e) \
36 pr_err("%s:%d: bad pud %p(%016lx)\n", \
37 __FILE__, __LINE__, &(e), pud_val(e))
38 #define pgd_ERROR(e) \
39 pr_err("%s:%d: bad pgd %p(%016lx)\n", \
40 __FILE__, __LINE__, &(e), pgd_val(e))
41
42 struct mm_struct;
43
44 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
45
46
native_set_pte(pte_t * ptep,pte_t pte)47 static inline void native_set_pte(pte_t *ptep, pte_t pte)
48 {
49 WRITE_ONCE(*ptep, pte);
50 }
51
native_pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)52 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
53 pte_t *ptep)
54 {
55 native_set_pte(ptep, native_make_pte(0));
56 }
57
native_set_pte_atomic(pte_t * ptep,pte_t pte)58 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
59 {
60 native_set_pte(ptep, pte);
61 }
62
native_set_pmd(pmd_t * pmdp,pmd_t pmd)63 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
64 {
65 WRITE_ONCE(*pmdp, pmd);
66 }
67
native_pmd_clear(pmd_t * pmd)68 static inline void native_pmd_clear(pmd_t *pmd)
69 {
70 native_set_pmd(pmd, native_make_pmd(0));
71 }
72
native_ptep_get_and_clear(pte_t * xp)73 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
74 {
75 #ifdef CONFIG_SMP
76 return native_make_pte(xchg(&xp->pte, 0));
77 #else
78 /* native_local_ptep_get_and_clear,
79 but duplicated because of cyclic dependency */
80 pte_t ret = *xp;
81 native_pte_clear(NULL, 0, xp);
82 return ret;
83 #endif
84 }
85
native_pmdp_get_and_clear(pmd_t * xp)86 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
87 {
88 #ifdef CONFIG_SMP
89 return native_make_pmd(xchg(&xp->pmd, 0));
90 #else
91 /* native_local_pmdp_get_and_clear,
92 but duplicated because of cyclic dependency */
93 pmd_t ret = *xp;
94 native_pmd_clear(xp);
95 return ret;
96 #endif
97 }
98
native_set_pud(pud_t * pudp,pud_t pud)99 static inline void native_set_pud(pud_t *pudp, pud_t pud)
100 {
101 WRITE_ONCE(*pudp, pud);
102 }
103
native_pud_clear(pud_t * pud)104 static inline void native_pud_clear(pud_t *pud)
105 {
106 native_set_pud(pud, native_make_pud(0));
107 }
108
109 #ifdef CONFIG_PAGE_TABLE_ISOLATION
110 extern pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd);
111
native_get_shadow_pgd(pgd_t * pgdp)112 static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
113 {
114 #ifdef CONFIG_DEBUG_VM
115 /* linux/mmdebug.h may not have been included at this point */
116 BUG_ON(!kaiser_enabled);
117 #endif
118 return (pgd_t *)((unsigned long)pgdp | (unsigned long)PAGE_SIZE);
119 }
120 #else
kaiser_set_shadow_pgd(pgd_t * pgdp,pgd_t pgd)121 static inline pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd)
122 {
123 return pgd;
124 }
native_get_shadow_pgd(pgd_t * pgdp)125 static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
126 {
127 BUILD_BUG_ON(1);
128 return NULL;
129 }
130 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
131
native_set_pgd(pgd_t * pgdp,pgd_t pgd)132 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
133 {
134 WRITE_ONCE(*pgdp, kaiser_set_shadow_pgd(pgdp, pgd));
135 }
136
native_pgd_clear(pgd_t * pgd)137 static inline void native_pgd_clear(pgd_t *pgd)
138 {
139 native_set_pgd(pgd, native_make_pgd(0));
140 }
141
142 extern void sync_global_pgds(unsigned long start, unsigned long end,
143 int removed);
144
145 /*
146 * Conversion functions: convert a page and protection to a page entry,
147 * and a page entry and page directory to the page they refer to.
148 */
149
150 /*
151 * Level 4 access.
152 */
pgd_large(pgd_t pgd)153 static inline int pgd_large(pgd_t pgd) { return 0; }
154 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
155
156 /* PUD - Level3 access */
157
158 /* PMD - Level 2 access */
159
160 /* PTE - Level 1 access. */
161
162 /* x86-64 always has all page tables mapped. */
163 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
164 #define pte_unmap(pte) ((void)(pte))/* NOP */
165
166 /*
167 * Encode and de-code a swap entry
168 *
169 * | ... | 11| 10| 9|8|7|6|5| 4| 3|2| 1|0| <- bit number
170 * | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
171 * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| X|X|SD|0| <- swp entry
172 *
173 * G (8) is aliased and used as a PROT_NONE indicator for
174 * !present ptes. We need to start storing swap entries above
175 * there. We also need to avoid using A and D because of an
176 * erratum where they can be incorrectly set by hardware on
177 * non-present PTEs.
178 *
179 * SD (1) in swp entry is used to store soft dirty bit, which helps us
180 * remember soft dirty over page migration
181 *
182 * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
183 * but also L and G.
184 *
185 * The offset is inverted by a binary not operation to make the high
186 * physical bits set.
187 */
188 #define SWP_TYPE_BITS 5
189
190 #define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
191
192 /* We always extract/encode the offset by shifting it all the way up, and then down again */
193 #define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS)
194
195 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
196
197 /* Extract the high bits for type */
198 #define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
199
200 /* Shift up (to get rid of type), then down to get value */
201 #define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT)
202
203 /*
204 * Shift the offset up "too far" by TYPE bits, then down again
205 * The offset is inverted by a binary not operation to make the high
206 * physical bits set.
207 */
208 #define __swp_entry(type, offset) ((swp_entry_t) { \
209 (~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
210 | ((unsigned long)(type) << (64-SWP_TYPE_BITS)) })
211
212 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
213 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
214
215 extern int kern_addr_valid(unsigned long addr);
216 extern void cleanup_highmap(void);
217
218 #define HAVE_ARCH_UNMAPPED_AREA
219 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
220
221 #define pgtable_cache_init() do { } while (0)
222 #define check_pgt_cache() do { } while (0)
223
224 #define PAGE_AGP PAGE_KERNEL_NOCACHE
225 #define HAVE_PAGE_AGP 1
226
227 /* fs/proc/kcore.c */
228 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
229 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
230
231 #define __HAVE_ARCH_PTE_SAME
232
233 #define vmemmap ((struct page *)VMEMMAP_START)
234
235 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
236 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
237
238 #include <asm/pgtable-invert.h>
239
240 #endif /* !__ASSEMBLY__ */
241
242 #endif /* _ASM_X86_PGTABLE_64_H */
243