1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
4 #include <linux/const.h>
5 #include <asm/pgtable_64_types.h>
10 * This file contains the functions and defines necessary to modify and use
11 * the x86-64 page table tree.
13 #include <asm/processor.h>
14 #include <linux/bitops.h>
15 #include <linux/threads.h>
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[];
25 #define swapper_pg_dir init_level4_pgt
27 extern void paging_init(void);
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))
44 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
47 static inline void native_set_pte(pte_t *ptep, pte_t pte)
49 WRITE_ONCE(*ptep, pte);
52 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
55 native_set_pte(ptep, native_make_pte(0));
58 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
60 native_set_pte(ptep, pte);
63 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
65 WRITE_ONCE(*pmdp, pmd);
68 static inline void native_pmd_clear(pmd_t *pmd)
70 native_set_pmd(pmd, native_make_pmd(0));
73 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
76 return native_make_pte(xchg(&xp->pte, 0));
78 /* native_local_ptep_get_and_clear,
79 but duplicated because of cyclic dependency */
81 native_pte_clear(NULL, 0, xp);
86 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
89 return native_make_pmd(xchg(&xp->pmd, 0));
91 /* native_local_pmdp_get_and_clear,
92 but duplicated because of cyclic dependency */
99 static inline void native_set_pud(pud_t *pudp, pud_t pud)
101 WRITE_ONCE(*pudp, pud);
104 static inline void native_pud_clear(pud_t *pud)
106 native_set_pud(pud, native_make_pud(0));
109 #ifdef CONFIG_PAGE_TABLE_ISOLATION
110 extern pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd);
112 static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
114 #ifdef CONFIG_DEBUG_VM
115 /* linux/mmdebug.h may not have been included at this point */
116 BUG_ON(!kaiser_enabled);
118 return (pgd_t *)((unsigned long)pgdp | (unsigned long)PAGE_SIZE);
121 static inline pgd_t kaiser_set_shadow_pgd(pgd_t *pgdp, pgd_t pgd)
125 static inline pgd_t *native_get_shadow_pgd(pgd_t *pgdp)
130 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
132 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
134 WRITE_ONCE(*pgdp, kaiser_set_shadow_pgd(pgdp, pgd));
137 static inline void native_pgd_clear(pgd_t *pgd)
139 native_set_pgd(pgd, native_make_pgd(0));
142 extern void sync_global_pgds(unsigned long start, unsigned long end,
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.
153 static inline int pgd_large(pgd_t pgd) { return 0; }
154 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
156 /* PUD - Level3 access */
158 /* PMD - Level 2 access */
160 /* PTE - Level 1 access. */
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 */
167 * Encode and de-code a swap entry
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
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
179 * SD (1) in swp entry is used to store soft dirty bit, which helps us
180 * remember soft dirty over page migration
182 * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
185 * The offset is inverted by a binary not operation to make the high
188 #define SWP_TYPE_BITS 5
190 #define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
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)
195 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
197 /* Extract the high bits for type */
198 #define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS))
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)
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
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)) })
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 })
215 extern int kern_addr_valid(unsigned long addr);
216 extern void cleanup_highmap(void);
218 #define HAVE_ARCH_UNMAPPED_AREA
219 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
221 #define pgtable_cache_init() do { } while (0)
222 #define check_pgt_cache() do { } while (0)
224 #define PAGE_AGP PAGE_KERNEL_NOCACHE
225 #define HAVE_PAGE_AGP 1
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)
231 #define __HAVE_ARCH_PTE_SAME
233 #define vmemmap ((struct page *)VMEMMAP_START)
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);
238 #include <asm/pgtable-invert.h>
240 #endif /* !__ASSEMBLY__ */
242 #endif /* _ASM_X86_PGTABLE_64_H */