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_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 #ifdef CONFIG_SMP 50 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) 51 { 52 return __pmd(xchg((pmdval_t *)xp, 0)); 53 } 54 #else 55 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) 56 #endif 57 58 /* Bit manipulation helper on pte/pgoff entry */ 59 static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, 60 unsigned long mask, unsigned int leftshift) 61 { 62 return ((value >> rightshift) & mask) << leftshift; 63 } 64 65 /* Encode and de-code a swap entry */ 66 #define SWP_TYPE_BITS 5 67 #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) 68 69 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) 70 71 #define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ 72 & ((1U << SWP_TYPE_BITS) - 1)) 73 #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) 74 #define __swp_entry(type, offset) ((swp_entry_t) { \ 75 ((type) << (_PAGE_BIT_PRESENT + 1)) \ 76 | ((offset) << SWP_OFFSET_SHIFT) }) 77 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) 78 #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) 79 80 #endif /* _ASM_X86_PGTABLE_2LEVEL_H */ 81