1 /* 2 * Copyright 2003 PathScale Inc 3 * Derived from include/asm-i386/pgtable.h 4 * Licensed under the GPL 5 */ 6 7 #ifndef __UM_PGTABLE_3LEVEL_H 8 #define __UM_PGTABLE_3LEVEL_H 9 10 #include <asm-generic/pgtable-nopud.h> 11 12 /* PGDIR_SHIFT determines what a third-level page table entry can map */ 13 14 #ifdef CONFIG_64BIT 15 #define PGDIR_SHIFT 30 16 #else 17 #define PGDIR_SHIFT 31 18 #endif 19 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 20 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 21 22 /* PMD_SHIFT determines the size of the area a second-level page table can 23 * map 24 */ 25 26 #define PMD_SHIFT 21 27 #define PMD_SIZE (1UL << PMD_SHIFT) 28 #define PMD_MASK (~(PMD_SIZE-1)) 29 30 /* 31 * entries per page directory level 32 */ 33 34 #define PTRS_PER_PTE 512 35 #ifdef CONFIG_64BIT 36 #define PTRS_PER_PMD 512 37 #define PTRS_PER_PGD 512 38 #else 39 #define PTRS_PER_PMD 1024 40 #define PTRS_PER_PGD 1024 41 #endif 42 43 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) 44 #define FIRST_USER_ADDRESS 0UL 45 46 #define pte_ERROR(e) \ 47 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 48 pte_val(e)) 49 #define pmd_ERROR(e) \ 50 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 51 pmd_val(e)) 52 #define pgd_ERROR(e) \ 53 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 54 pgd_val(e)) 55 56 #define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE)) 57 #define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) 58 #define pud_present(x) (pud_val(x) & _PAGE_PRESENT) 59 #define pud_populate(mm, pud, pmd) \ 60 set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd))) 61 62 #ifdef CONFIG_64BIT 63 #define set_pud(pudptr, pudval) set_64bit((u64 *) (pudptr), pud_val(pudval)) 64 #else 65 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval)) 66 #endif 67 68 static inline int pgd_newpage(pgd_t pgd) 69 { 70 return(pgd_val(pgd) & _PAGE_NEWPAGE); 71 } 72 73 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; } 74 75 #ifdef CONFIG_64BIT 76 #define set_pmd(pmdptr, pmdval) set_64bit((u64 *) (pmdptr), pmd_val(pmdval)) 77 #else 78 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) 79 #endif 80 81 struct mm_struct; 82 extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address); 83 84 static inline void pud_clear (pud_t *pud) 85 { 86 set_pud(pud, __pud(_PAGE_NEWPAGE)); 87 } 88 89 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK) 90 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PAGE_MASK)) 91 92 /* Find an entry in the second-level page table.. */ 93 #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \ 94 pmd_index(address)) 95 96 static inline unsigned long pte_pfn(pte_t pte) 97 { 98 return phys_to_pfn(pte_val(pte)); 99 } 100 101 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 102 { 103 pte_t pte; 104 phys_t phys = pfn_to_phys(page_nr); 105 106 pte_set_val(pte, phys, pgprot); 107 return pte; 108 } 109 110 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 111 { 112 return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); 113 } 114 115 #endif 116 117