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 USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
25 #define PTRS_PER_PGD 1024
26 #define FIRST_USER_ADDRESS 0
28 #define pte_ERROR(e) \
29 printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
31 #define pgd_ERROR(e) \
32 printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
35 static inline int pgd_newpage(pgd_t pgd
) { return 0; }
36 static inline void pgd_mkuptodate(pgd_t pgd
) { }
38 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
40 #define pte_pfn(x) phys_to_pfn(pte_val(x))
41 #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))
42 #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))
45 * Bits 0 through 4 are taken
47 #define PTE_FILE_MAX_BITS 27
49 #define pte_to_pgoff(pte) (pte_val(pte) >> 5)
51 #define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })
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