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