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 0 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 68static inline int pgd_newpage(pgd_t pgd) 69{ 70 return(pgd_val(pgd) & _PAGE_NEWPAGE); 71} 72 73static 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 81struct mm_struct; 82extern pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address); 83 84static 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 96static inline unsigned long pte_pfn(pte_t pte) 97{ 98 return phys_to_pfn(pte_val(pte)); 99} 100 101static inline pte_t pfn_pte(pfn_t 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 110static inline pmd_t pfn_pmd(pfn_t page_nr, pgprot_t pgprot) 111{ 112 return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); 113} 114 115/* 116 * Bits 0 through 3 are taken in the low part of the pte, 117 * put the 32 bits of offset into the high part. 118 */ 119#define PTE_FILE_MAX_BITS 32 120 121#ifdef CONFIG_64BIT 122 123#define pte_to_pgoff(p) ((p).pte >> 32) 124 125#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE }) 126 127#else 128 129#define pte_to_pgoff(pte) ((pte).pte_high) 130 131#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) }) 132 133#endif 134 135#endif 136