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 */ 14static inline void native_set_pte(pte_t *ptep , pte_t pte) 15{ 16 *ptep = pte; 17} 18static 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} 23static 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 39static 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 45static 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 */ 62static 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