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Linux/arch/x86/include/asm/pgtable_64.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_PGTABLE_64_H
  3 #define _ASM_X86_PGTABLE_64_H
  4 
  5 #include <linux/const.h>
  6 #include <asm/pgtable_64_types.h>
  7 
  8 #ifndef __ASSEMBLY__
  9 
 10 /*
 11  * This file contains the functions and defines necessary to modify and use
 12  * the x86-64 page table tree.
 13  */
 14 #include <asm/processor.h>
 15 #include <linux/bitops.h>
 16 #include <linux/threads.h>
 17 #include <asm/fixmap.h>
 18 
 19 extern p4d_t level4_kernel_pgt[512];
 20 extern p4d_t level4_ident_pgt[512];
 21 extern pud_t level3_kernel_pgt[512];
 22 extern pud_t level3_ident_pgt[512];
 23 extern pmd_t level2_kernel_pgt[512];
 24 extern pmd_t level2_fixmap_pgt[512];
 25 extern pmd_t level2_ident_pgt[512];
 26 extern pte_t level1_fixmap_pgt[512 * FIXMAP_PMD_NUM];
 27 extern pgd_t init_top_pgt[];
 28 
 29 #define swapper_pg_dir init_top_pgt
 30 
 31 extern void paging_init(void);
 32 static inline void sync_initial_page_table(void) { }
 33 
 34 #define pte_ERROR(e)                                    \
 35         pr_err("%s:%d: bad pte %p(%016lx)\n",           \
 36                __FILE__, __LINE__, &(e), pte_val(e))
 37 #define pmd_ERROR(e)                                    \
 38         pr_err("%s:%d: bad pmd %p(%016lx)\n",           \
 39                __FILE__, __LINE__, &(e), pmd_val(e))
 40 #define pud_ERROR(e)                                    \
 41         pr_err("%s:%d: bad pud %p(%016lx)\n",           \
 42                __FILE__, __LINE__, &(e), pud_val(e))
 43 
 44 #if CONFIG_PGTABLE_LEVELS >= 5
 45 #define p4d_ERROR(e)                                    \
 46         pr_err("%s:%d: bad p4d %p(%016lx)\n",           \
 47                __FILE__, __LINE__, &(e), p4d_val(e))
 48 #endif
 49 
 50 #define pgd_ERROR(e)                                    \
 51         pr_err("%s:%d: bad pgd %p(%016lx)\n",           \
 52                __FILE__, __LINE__, &(e), pgd_val(e))
 53 
 54 struct mm_struct;
 55 
 56 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
 57 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
 58 
 59 static inline void native_set_pte(pte_t *ptep, pte_t pte)
 60 {
 61         WRITE_ONCE(*ptep, pte);
 62 }
 63 
 64 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
 65                                     pte_t *ptep)
 66 {
 67         native_set_pte(ptep, native_make_pte(0));
 68 }
 69 
 70 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
 71 {
 72         native_set_pte(ptep, pte);
 73 }
 74 
 75 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
 76 {
 77         WRITE_ONCE(*pmdp, pmd);
 78 }
 79 
 80 static inline void native_pmd_clear(pmd_t *pmd)
 81 {
 82         native_set_pmd(pmd, native_make_pmd(0));
 83 }
 84 
 85 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
 86 {
 87 #ifdef CONFIG_SMP
 88         return native_make_pte(xchg(&xp->pte, 0));
 89 #else
 90         /* native_local_ptep_get_and_clear,
 91            but duplicated because of cyclic dependency */
 92         pte_t ret = *xp;
 93         native_pte_clear(NULL, 0, xp);
 94         return ret;
 95 #endif
 96 }
 97 
 98 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
 99 {
100 #ifdef CONFIG_SMP
101         return native_make_pmd(xchg(&xp->pmd, 0));
102 #else
103         /* native_local_pmdp_get_and_clear,
104            but duplicated because of cyclic dependency */
105         pmd_t ret = *xp;
106         native_pmd_clear(xp);
107         return ret;
108 #endif
109 }
110 
111 static inline void native_set_pud(pud_t *pudp, pud_t pud)
112 {
113         WRITE_ONCE(*pudp, pud);
114 }
115 
116 static inline void native_pud_clear(pud_t *pud)
117 {
118         native_set_pud(pud, native_make_pud(0));
119 }
120 
121 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
122 {
123 #ifdef CONFIG_SMP
124         return native_make_pud(xchg(&xp->pud, 0));
125 #else
126         /* native_local_pudp_get_and_clear,
127          * but duplicated because of cyclic dependency
128          */
129         pud_t ret = *xp;
130 
131         native_pud_clear(xp);
132         return ret;
133 #endif
134 }
135 
136 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
137 {
138         pgd_t pgd;
139 
140         if (pgtable_l5_enabled() || !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) {
141                 WRITE_ONCE(*p4dp, p4d);
142                 return;
143         }
144 
145         pgd = native_make_pgd(native_p4d_val(p4d));
146         pgd = pti_set_user_pgtbl((pgd_t *)p4dp, pgd);
147         WRITE_ONCE(*p4dp, native_make_p4d(native_pgd_val(pgd)));
148 }
149 
150 static inline void native_p4d_clear(p4d_t *p4d)
151 {
152         native_set_p4d(p4d, native_make_p4d(0));
153 }
154 
155 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
156 {
157         WRITE_ONCE(*pgdp, pti_set_user_pgtbl(pgdp, pgd));
158 }
159 
160 static inline void native_pgd_clear(pgd_t *pgd)
161 {
162         native_set_pgd(pgd, native_make_pgd(0));
163 }
164 
165 extern void sync_global_pgds(unsigned long start, unsigned long end);
166 
167 /*
168  * Conversion functions: convert a page and protection to a page entry,
169  * and a page entry and page directory to the page they refer to.
170  */
171 
172 /*
173  * Level 4 access.
174  */
175 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
176 
177 /* PUD - Level3 access */
178 
179 /* PMD  - Level 2 access */
180 
181 /* PTE - Level 1 access. */
182 
183 /* x86-64 always has all page tables mapped. */
184 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
185 #define pte_unmap(pte) ((void)(pte))/* NOP */
186 
187 /*
188  * Encode and de-code a swap entry
189  *
190  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
191  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
192  * | TYPE (59-63) | ~OFFSET (9-58)  |0|0|X|X| X| X|X|SD|0| <- swp entry
193  *
194  * G (8) is aliased and used as a PROT_NONE indicator for
195  * !present ptes.  We need to start storing swap entries above
196  * there.  We also need to avoid using A and D because of an
197  * erratum where they can be incorrectly set by hardware on
198  * non-present PTEs.
199  *
200  * SD (1) in swp entry is used to store soft dirty bit, which helps us
201  * remember soft dirty over page migration
202  *
203  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
204  * but also L and G.
205  *
206  * The offset is inverted by a binary not operation to make the high
207  * physical bits set.
208  */
209 #define SWP_TYPE_BITS           5
210 
211 #define SWP_OFFSET_FIRST_BIT    (_PAGE_BIT_PROTNONE + 1)
212 
213 /* We always extract/encode the offset by shifting it all the way up, and then down again */
214 #define SWP_OFFSET_SHIFT        (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS)
215 
216 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
217 
218 /* Extract the high bits for type */
219 #define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
220 
221 /* Shift up (to get rid of type), then down to get value */
222 #define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT)
223 
224 /*
225  * Shift the offset up "too far" by TYPE bits, then down again
226  * The offset is inverted by a binary not operation to make the high
227  * physical bits set.
228  */
229 #define __swp_entry(type, offset) ((swp_entry_t) { \
230         (~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \
231         | ((unsigned long)(type) << (64-SWP_TYPE_BITS)) })
232 
233 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val((pte)) })
234 #define __pmd_to_swp_entry(pmd)         ((swp_entry_t) { pmd_val((pmd)) })
235 #define __swp_entry_to_pte(x)           ((pte_t) { .pte = (x).val })
236 #define __swp_entry_to_pmd(x)           ((pmd_t) { .pmd = (x).val })
237 
238 extern int kern_addr_valid(unsigned long addr);
239 extern void cleanup_highmap(void);
240 
241 #define HAVE_ARCH_UNMAPPED_AREA
242 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
243 
244 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
245 #define HAVE_PAGE_AGP 1
246 
247 /* fs/proc/kcore.c */
248 #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
249 #define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
250 
251 #define __HAVE_ARCH_PTE_SAME
252 
253 #define vmemmap ((struct page *)VMEMMAP_START)
254 
255 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
256 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
257 
258 #define gup_fast_permitted gup_fast_permitted
259 static inline bool gup_fast_permitted(unsigned long start, unsigned long end)
260 {
261         if (end >> __VIRTUAL_MASK_SHIFT)
262                 return false;
263         return true;
264 }
265 
266 #include <asm/pgtable-invert.h>
267 
268 #endif /* !__ASSEMBLY__ */
269 #endif /* _ASM_X86_PGTABLE_64_H */
270 

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