2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright 2003 PathScale, Inc.
4 * Derived from include/asm-i386/pgtable.h
5 * Licensed under the GPL
8 #ifndef __UM_PGTABLE_2LEVEL_H
9 #define __UM_PGTABLE_2LEVEL_H
11 #include <asm-generic/pgtable-nopmd.h>
13 /* PGDIR_SHIFT determines what a third-level page table entry can map */
15 #define PGDIR_SHIFT 22
16 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
17 #define PGDIR_MASK (~(PGDIR_SIZE-1))
20 * entries per page directory level: the i386 is two-level, so
21 * we don't really have any PMD directory physically.
23 #define PTRS_PER_PTE 1024
24 #define PTRS_PER_PMD 1
25 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
26 #define PTRS_PER_PGD 1024
27 #define FIRST_USER_PGD_NR 0
29 #define pte_ERROR(e) \
30 printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
32 #define pgd_ERROR(e) \
33 printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
36 static inline int pgd_newpage(pgd_t pgd) { return 0; }
37 static inline void pgd_mkuptodate(pgd_t pgd) { }
39 #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
41 static inline pte_t pte_mknewprot(pte_t pte)
43 pte_val(pte) |= _PAGE_NEWPROT;
47 static inline pte_t pte_mknewpage(pte_t pte)
49 pte_val(pte) |= _PAGE_NEWPAGE;
53 static inline void set_pte(pte_t *pteptr, pte_t pteval)
55 /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
56 * fix_range knows to unmap it. _PAGE_NEWPROT is specific to
59 *pteptr = pte_mknewpage(pteval);
60 if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
63 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
65 #define pte_page(x) pfn_to_page(pte_pfn(x))
66 #define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE)
67 #define pte_pfn(x) phys_to_pfn(pte_val(x))
68 #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
69 #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
71 #define pmd_page_kernel(pmd) \
72 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
75 * Bits 0 through 3 are taken
77 #define PTE_FILE_MAX_BITS 28
79 #define pte_to_pgoff(pte) (pte_val(pte) >> 4)
81 #define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })