1 /*
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
26 #define FIRST_USER_ADDRESS	0
27 
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 
35 static inline int pgd_newpage(pgd_t pgd)	{ return 0; }
36 static inline void pgd_mkuptodate(pgd_t pgd)	{ }
37 
38 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
39 
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))
43 
44 /*
45  * Bits 0 through 4 are taken
46  */
47 #define PTE_FILE_MAX_BITS	27
48 
49 #define pte_to_pgoff(pte) (pte_val(pte) >> 5)
50 
51 #define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })
52 
53 #endif
54