1 #ifndef _ASM_X86_PGTABLE_2LEVEL_H 2 #define _ASM_X86_PGTABLE_2LEVEL_H 3 4 #define pte_ERROR(e) \ 5 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) 6 #define pgd_ERROR(e) \ 7 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 8 9 /* 10 * Certain architectures need to do special things when PTEs 11 * within a page table are directly modified. Thus, the following 12 * hook is made available. 13 */ 14 static inline void native_set_pte(pte_t *ptep , pte_t pte) 15 { 16 *ptep = pte; 17 } 18 19 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) 20 { 21 *pmdp = pmd; 22 } 23 24 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) 25 { 26 native_set_pte(ptep, pte); 27 } 28 29 static inline void native_pmd_clear(pmd_t *pmdp) 30 { 31 native_set_pmd(pmdp, __pmd(0)); 32 } 33 34 static inline void native_pte_clear(struct mm_struct *mm, 35 unsigned long addr, pte_t *xp) 36 { 37 *xp = native_make_pte(0); 38 } 39 40 #ifdef CONFIG_SMP 41 static inline pte_t native_ptep_get_and_clear(pte_t *xp) 42 { 43 return __pte(xchg(&xp->pte_low, 0)); 44 } 45 #else 46 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) 47 #endif 48 49 /* 50 * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken, 51 * split up the 29 bits of offset into this range: 52 */ 53 #define PTE_FILE_MAX_BITS 29 54 #define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1) 55 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE 56 #define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1) 57 #define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1) 58 #else 59 #define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1) 60 #define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1) 61 #endif 62 #define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1) 63 #define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1) 64 65 #define pte_to_pgoff(pte) \ 66 ((((pte).pte_low >> PTE_FILE_SHIFT1) \ 67 & ((1U << PTE_FILE_BITS1) - 1)) \ 68 + ((((pte).pte_low >> PTE_FILE_SHIFT2) \ 69 & ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \ 70 + (((pte).pte_low >> PTE_FILE_SHIFT3) \ 71 << (PTE_FILE_BITS1 + PTE_FILE_BITS2))) 72 73 #define pgoff_to_pte(off) \ 74 ((pte_t) { .pte_low = \ 75 (((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \ 76 + ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \ 77 << PTE_FILE_SHIFT2) \ 78 + (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \ 79 << PTE_FILE_SHIFT3) \ 80 + _PAGE_FILE }) 81 82 /* Encode and de-code a swap entry */ 83 #if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE 84 #define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) 85 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) 86 #else 87 #define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1) 88 #define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1) 89 #endif 90 91 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) 92 93 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ 94 & ((1U << SWP_TYPE_BITS) - 1)) 95 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) 96 #define __swp_entry(type, offset) ((swp_entry_t) { \ 97 ((type) << (_PAGE_BIT_PRESENT + 1)) \ 98 | ((offset) << SWP_OFFSET_SHIFT) }) 99 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) 100 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) 101 102 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ 103