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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_PGTABLE_2LEVEL_H #define _ASM_X86_PGTABLE_2LEVEL_H #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low) #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e)) /* * Certain architectures need to do special things when PTEs * within a page table are directly modified. Thus, the following * hook is made available. */ static inline void native_set_pte(pte_t *ptep , pte_t pte) { *ptep = pte; } static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) { *pmdp = pmd; } static inline void native_set_pud(pud_t *pudp, pud_t pud) { } static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) { native_set_pte(ptep, pte); } static inline void native_pmd_clear(pmd_t *pmdp) { native_set_pmd(pmdp, __pmd(0)); } static inline void native_pud_clear(pud_t *pudp) { } static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp) { *xp = native_make_pte(0); } #ifdef CONFIG_SMP static inline pte_t native_ptep_get_and_clear(pte_t *xp) { return __pte(xchg(&xp->pte_low, 0)); } #else #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) #endif #ifdef CONFIG_SMP static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) { return __pmd(xchg((pmdval_t *)xp, 0)); } #else #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) #endif #ifdef CONFIG_SMP static inline pud_t native_pudp_get_and_clear(pud_t *xp) { return __pud(xchg((pudval_t *)xp, 0)); } #else #define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp) #endif /* Bit manipulation helper on pte/pgoff entry */ static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, unsigned long mask, unsigned int leftshift) { return ((value >> rightshift) & mask) << leftshift; } /* Encode and de-code a swap entry */ #define SWP_TYPE_BITS 5 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ & ((1U << SWP_TYPE_BITS) - 1)) #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) #define __swp_entry(type, offset) ((swp_entry_t) { \ ((type) << (_PAGE_BIT_PRESENT + 1)) \ | ((offset) << SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) /* No inverted PFNs on 2 level page tables */ static inline u64 protnone_mask(u64 val) { return 0; } static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask) { return val; } static inline bool __pte_needs_invert(u64 val) { return false; } #endif /* _ASM_X86_PGTABLE_2LEVEL_H */
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