Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #define PGDIR_SHIFT 30 |
| 15 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| 16 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 17 | |
| 18 | /* PMD_SHIFT determines the size of the area a second-level page table can |
| 19 | * map |
| 20 | */ |
| 21 | |
| 22 | #define PMD_SHIFT 21 |
| 23 | #define PMD_SIZE (1UL << PMD_SHIFT) |
| 24 | #define PMD_MASK (~(PMD_SIZE-1)) |
| 25 | |
| 26 | /* |
| 27 | * entries per page directory level |
| 28 | */ |
| 29 | |
| 30 | #define PTRS_PER_PTE 512 |
| 31 | #define PTRS_PER_PMD 512 |
| 32 | #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) |
| 33 | #define PTRS_PER_PGD 512 |
Hugh Dickins | d455a36 | 2005-04-19 13:29:23 -0700 | [diff] [blame] | 34 | #define FIRST_USER_ADDRESS 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #define pte_ERROR(e) \ |
| 37 | printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \ |
| 38 | pte_val(e)) |
| 39 | #define pmd_ERROR(e) \ |
| 40 | printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ |
| 41 | pmd_val(e)) |
| 42 | #define pgd_ERROR(e) \ |
| 43 | printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ |
| 44 | pgd_val(e)) |
| 45 | |
| 46 | #define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE)) |
| 47 | #define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) |
| 48 | #define pud_present(x) (pud_val(x) & _PAGE_PRESENT) |
| 49 | #define pud_populate(mm, pud, pmd) \ |
| 50 | set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd))) |
| 51 | |
| 52 | #define set_pud(pudptr, pudval) set_64bit((phys_t *) (pudptr), pud_val(pudval)) |
| 53 | static inline int pgd_newpage(pgd_t pgd) |
| 54 | { |
| 55 | return(pgd_val(pgd) & _PAGE_NEWPAGE); |
| 56 | } |
| 57 | |
| 58 | static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; } |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval)) |
| 61 | |
| 62 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) |
| 63 | { |
| 64 | pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL); |
| 65 | |
| 66 | if(pmd) |
| 67 | memset(pmd, 0, PAGE_SIZE); |
| 68 | |
| 69 | return pmd; |
| 70 | } |
| 71 | |
Jeff Dike | b21d4b0 | 2007-10-16 01:27:10 -0700 | [diff] [blame] | 72 | static inline void pud_clear (pud_t *pud) |
Jeff Dike | 7ef9390 | 2005-09-03 15:57:52 -0700 | [diff] [blame] | 73 | { |
Jeff Dike | 8cd8fa5 | 2007-11-14 16:58:53 -0800 | [diff] [blame] | 74 | set_pud(pud, __pud(_PAGE_NEWPAGE)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 77 | #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK) |
| 78 | #define pud_page_vaddr(pud) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | ((struct page *) __va(pud_val(pud) & PAGE_MASK)) |
| 80 | |
| 81 | /* Find an entry in the second-level page table.. */ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame] | 82 | #define pmd_offset(pud, address) ((pmd_t *) pud_page_vaddr(*(pud)) + \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | pmd_index(address)) |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | static inline unsigned long pte_pfn(pte_t pte) |
| 86 | { |
| 87 | return phys_to_pfn(pte_val(pte)); |
| 88 | } |
| 89 | |
| 90 | static inline pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot) |
| 91 | { |
| 92 | pte_t pte; |
| 93 | phys_t phys = pfn_to_phys(page_nr); |
| 94 | |
| 95 | pte_set_val(pte, phys, pgprot); |
| 96 | return pte; |
| 97 | } |
| 98 | |
| 99 | static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot) |
| 100 | { |
| 101 | return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Bits 0 through 3 are taken in the low part of the pte, |
| 106 | * put the 32 bits of offset into the high part. |
| 107 | */ |
| 108 | #define PTE_FILE_MAX_BITS 32 |
| 109 | |
Paolo 'Blaisorblade' Giarrusso | c45166b | 2005-05-01 08:58:54 -0700 | [diff] [blame] | 110 | #ifdef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | |
| 112 | #define pte_to_pgoff(p) ((p).pte >> 32) |
| 113 | |
Paolo 'Blaisorblade' Giarrusso | f7fe878 | 2005-05-05 16:15:15 -0700 | [diff] [blame] | 114 | #define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | #else |
| 117 | |
| 118 | #define pte_to_pgoff(pte) ((pte).pte_high) |
| 119 | |
| 120 | #define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) |
| 121 | |
| 122 | #endif |
| 123 | |
| 124 | #endif |
| 125 | |
| 126 | /* |
| 127 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 128 | * Emacs will notice this stuff at the end of the file and automatically |
| 129 | * adjust the settings for this buffer only. This must remain at the end |
| 130 | * of the file. |
| 131 | * --------------------------------------------------------------------------- |
| 132 | * Local variables: |
| 133 | * c-file-style: "linux" |
| 134 | * End: |
| 135 | */ |