forked from KolibriOS/kolibrios
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
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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_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_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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/* 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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/*
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* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
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* split up the 29 bits of offset into this range.
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*/
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#define PTE_FILE_MAX_BITS 29
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#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
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#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
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#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
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#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
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#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
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#define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1)
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#define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1)
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#define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1)
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#define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2)
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static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
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{
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return (pgoff_t)
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(pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) +
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pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) +
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pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, -1UL, PTE_FILE_LSHIFT3));
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}
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static __always_inline pte_t pgoff_to_pte(pgoff_t off)
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{
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return (pte_t){
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.pte_low =
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pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) +
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pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) +
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pte_bitop(off, PTE_FILE_LSHIFT3, -1UL, PTE_FILE_SHIFT3) +
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_PAGE_FILE,
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};
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}
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/* Encode and de-code a swap entry */
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#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
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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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#endif /* _ASM_X86_PGTABLE_2LEVEL_H */
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