blob: ffe017f6b64b587f3863e3f3b5c70aec3e714744 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
6 */
7
8#ifndef __UM_PGTABLE_2LEVEL_H
9#define __UM_PGTABLE_2LEVEL_H
10
11#include <asm-generic/pgtable-nopmd.h>
12
13/* PGDIR_SHIFT determines what a third-level page table entry can map */
14
15#define PGDIR_SHIFT 22
16#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
17#define PGDIR_MASK (~(PGDIR_SIZE-1))
18
19/*
20 * entries per page directory level: the i386 is two-level, so
21 * we don't really have any PMD directory physically.
22 */
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
Hugh Dickinsd455a362005-04-19 13:29:23 -070026#define FIRST_USER_ADDRESS 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#define pte_ERROR(e) \
29 printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \
30 pte_val(e))
31#define pgd_ERROR(e) \
32 printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \
33 pgd_val(e))
34
35static inline int pgd_newpage(pgd_t pgd) { return 0; }
36static inline void pgd_mkuptodate(pgd_t pgd) { }
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#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))
43
44#define pmd_page_kernel(pmd) \
45 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
46
47/*
48 * Bits 0 through 3 are taken
49 */
50#define PTE_FILE_MAX_BITS 28
51
52#define pte_to_pgoff(pte) (pte_val(pte) >> 4)
53
54#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE })
55
56#endif