1 #ifndef _I386_PGTABLE_2LEVEL_H 2 #define _I386_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 static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr, 19 pte_t *ptep , pte_t pte) 20 { 21 native_set_pte(ptep, pte); 22 } 23 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) 24 { 25 *pmdp = pmd; 26 } 27 #ifndef CONFIG_PARAVIRT 28 #define set_pte(pteptr, pteval) native_set_pte(pteptr, pteval) 29 #define set_pte_at(mm,addr,ptep,pteval) native_set_pte_at(mm, addr, ptep, pteval) 30 #define set_pmd(pmdptr, pmdval) native_set_pmd(pmdptr, pmdval) 31 #endif 32 33 #define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval) 34 #define set_pte_present(mm,addr,ptep,pteval) set_pte_at(mm,addr,ptep,pteval) 35 36 #define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0) 37 #define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0) 38 39 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *xp) 40 { 41 *xp = __pte(0); 42 } 43 44 #ifdef CONFIG_SMP 45 static inline pte_t native_ptep_get_and_clear(pte_t *xp) 46 { 47 return __pte(xchg(&xp->pte_low, 0)); 48 } 49 #else 50 #define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp) 51 #endif 52 53 #define pte_page(x) pfn_to_page(pte_pfn(x)) 54 #define pte_none(x) (!(x).pte_low) 55 #define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT) 56 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) 57 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot)) 58 59 /* 60 * All present pages are kernel-executable: 61 */ 62 static inline int pte_exec_kernel(pte_t pte) 63 { 64 return 1; 65 } 66 67 /* 68 * Bits 0, 6 and 7 are taken, split up the 29 bits of offset 69 * into this range: 70 */ 71 #define PTE_FILE_MAX_BITS 29 72 73 #define pte_to_pgoff(pte) \ 74 ((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 )) 75 76 #define pgoff_to_pte(off) \ 77 ((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE }) 78 79 /* Encode and de-code a swap entry */ 80 #define __swp_type(x) (((x).val >> 1) & 0x1f) 81 #define __swp_offset(x) ((x).val >> 8) 82 #define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) }) 83 #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) 84 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 85 86 #endif /* _I386_PGTABLE_2LEVEL_H */ 87
