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      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