1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_2LEVEL_H
3 #define _ASM_X86_PGTABLE_2LEVEL_H
6 pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
8 pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))
11 * Certain architectures need to do special things when PTEs
12 * within a page table are directly modified. Thus, the following
13 * hook is made available.
15 static inline void native_set_pte(pte_t *ptep , pte_t pte)
20 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
25 static inline void native_set_pud(pud_t *pudp, pud_t pud)
29 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
31 native_set_pte(ptep, pte);
34 static inline void native_pmd_clear(pmd_t *pmdp)
36 native_set_pmd(pmdp, __pmd(0));
39 static inline void native_pud_clear(pud_t *pudp)
43 static inline void native_pte_clear(struct mm_struct *mm,
44 unsigned long addr, pte_t *xp)
46 *xp = native_make_pte(0);
50 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
52 return __pte(xchg(&xp->pte_low, 0));
55 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
59 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
61 return __pmd(xchg((pmdval_t *)xp, 0));
64 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
68 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
70 return __pud(xchg((pudval_t *)xp, 0));
73 #define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp)
76 /* Bit manipulation helper on pte/pgoff entry */
77 static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
78 unsigned long mask, unsigned int leftshift)
80 return ((value >> rightshift) & mask) << leftshift;
84 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
85 * are !pte_none() && !pte_present().
87 * Format of swap PTEs:
89 * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
90 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
91 * <----------------- offset ------------------> 0 E <- type --> 0
93 * E is the exclusive marker that is not stored in swap entries.
95 #define SWP_TYPE_BITS 5
96 #define _SWP_TYPE_MASK ((1U << SWP_TYPE_BITS) - 1)
97 #define _SWP_TYPE_SHIFT (_PAGE_BIT_PRESENT + 1)
98 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
100 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5)
102 #define __swp_type(x) (((x).val >> _SWP_TYPE_SHIFT) \
104 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
105 #define __swp_entry(type, offset) ((swp_entry_t) { \
106 (((type) & _SWP_TYPE_MASK) << _SWP_TYPE_SHIFT) \
107 | ((offset) << SWP_OFFSET_SHIFT) })
108 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
109 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
111 /* We borrow bit 7 to store the exclusive marker in swap PTEs. */
112 #define _PAGE_SWP_EXCLUSIVE _PAGE_PSE
114 /* No inverted PFNs on 2 level page tables */
116 static inline u64 protnone_mask(u64 val)
121 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask)
126 static inline bool __pte_needs_invert(u64 val)
131 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */