1 #ifndef _ASM_X86_PGTABLE_2LEVEL_H 2 #define _ASM_X86_PGTABLE_2LEVEL_H 3 4 #define pte_ERROR(e) \ 5 pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low) 6 #define pgd_ERROR(e) \ 7 pr_err("%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_pud(pud_t *pudp, pud_t pud) 25 { 26 } 27 28 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) 29 { 30 native_set_pte(ptep, pte); 31 } 32 33 static inline void native_pmd_clear(pmd_t *pmdp) 34 { 35 native_set_pmd(pmdp, __pmd(0)); 36 } 37 38 static inline void native_pud_clear(pud_t *pudp) 39 { 40 } 41 42 static inline void native_pte_clear(struct mm_struct *mm, 43 unsigned long addr, pte_t *xp) 44 { 45 *xp = native_make_pte(0); 46 } 47 48 #ifdef CONFIG_SMP 49 static inline pte_t native_ptep_get_and_clear(pte_t *xp) 50 { 51 return __pte(xchg(&xp->pte_low, 0)); 52 } 53 #else 54 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) 55 #endif 56 57 #ifdef CONFIG_SMP 58 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) 59 { 60 return __pmd(xchg((pmdval_t *)xp, 0)); 61 } 62 #else 63 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) 64 #endif 65 66 #ifdef CONFIG_SMP 67 static inline pud_t native_pudp_get_and_clear(pud_t *xp) 68 { 69 return __pud(xchg((pudval_t *)xp, 0)); 70 } 71 #else 72 #define native_pudp_get_and_clear(xp) native_local_pudp_get_and_clear(xp) 73 #endif 74 75 /* Bit manipulation helper on pte/pgoff entry */ 76 static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, 77 unsigned long mask, unsigned int leftshift) 78 { 79 return ((value >> rightshift) & mask) << leftshift; 80 } 81 82 /* Encode and de-code a swap entry */ 83 #define SWP_TYPE_BITS 5 84 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) 85 86 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) 87 88 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ 89 & ((1U << SWP_TYPE_BITS) - 1)) 90 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) 91 #define __swp_entry(type, offset) ((swp_entry_t) { \ 92 ((type) << (_PAGE_BIT_PRESENT + 1)) \ 93 | ((offset) << SWP_OFFSET_SHIFT) }) 94 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) 95 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) 96 97 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ 98