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1  /*
2   *  arch/arm/include/asm/pgtable-nommu.h
3   *
4   *  Copyright (C) 1995-2002 Russell King
5   *  Copyright (C) 2004  Hyok S. Choi
6   *
7   * This program is free software; you can redistribute it and/or modify
8   * it under the terms of the GNU General Public License version 2 as
9   * published by the Free Software Foundation.
10   */
11  #ifndef _ASMARM_PGTABLE_NOMMU_H
12  #define _ASMARM_PGTABLE_NOMMU_H
13  
14  #ifndef __ASSEMBLY__
15  
16  #include <linux/slab.h>
17  #include <asm/processor.h>
18  #include <asm/page.h>
19  
20  /*
21   * Trivial page table functions.
22   */
23  #define pgd_present(pgd)	(1)
24  #define pgd_none(pgd)		(0)
25  #define pgd_bad(pgd)		(0)
26  #define pgd_clear(pgdp)
27  #define kern_addr_valid(addr)	(1)
28  #define	pmd_offset(a, b)	((void *)0)
29  /* FIXME */
30  /*
31   * PMD_SHIFT determines the size of the area a second-level page table can map
32   * PGDIR_SHIFT determines what a third-level page table entry can map
33   */
34  #define PGDIR_SHIFT		21
35  
36  #define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
37  #define PGDIR_MASK		(~(PGDIR_SIZE-1))
38  /* FIXME */
39  
40  #define PAGE_NONE	__pgprot(0)
41  #define PAGE_SHARED	__pgprot(0)
42  #define PAGE_COPY	__pgprot(0)
43  #define PAGE_READONLY	__pgprot(0)
44  #define PAGE_KERNEL	__pgprot(0)
45  
46  #define swapper_pg_dir ((pgd_t *) 0)
47  
48  #define __swp_type(x)		(0)
49  #define __swp_offset(x)		(0)
50  #define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
51  #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
52  #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
53  
54  
55  typedef pte_t *pte_addr_t;
56  
pte_file(pte_t pte)57  static inline int pte_file(pte_t pte) { return 0; }
58  
59  /*
60   * ZERO_PAGE is a global shared page that is always zero: used
61   * for zero-mapped memory areas etc..
62   */
63  #define ZERO_PAGE(vaddr)	(virt_to_page(0))
64  
65  /*
66   * Mark the prot value as uncacheable and unbufferable.
67   */
68  #define pgprot_noncached(prot)	__pgprot(0)
69  #define pgprot_writecombine(prot) __pgprot(0)
70  #define pgprot_dmacoherent(prot) __pgprot(0)
71  
72  
73  /*
74   * These would be in other places but having them here reduces the diffs.
75   */
76  extern unsigned int kobjsize(const void *objp);
77  
78  /*
79   * No page table caches to initialise.
80   */
81  #define pgtable_cache_init()	do { } while (0)
82  
83  /*
84   * All 32bit addresses are effectively valid for vmalloc...
85   * Sort of meaningless for non-VM targets.
86   */
87  #define	VMALLOC_START	0UL
88  #define	VMALLOC_END	0xffffffffUL
89  
90  #define FIRST_USER_ADDRESS      (0)
91  
92  #include <asm-generic/pgtable.h>
93  
94  #else
95  
96  /*
97   * dummy tlb and user structures.
98   */
99  #define v3_tlb_fns	(0)
100  #define v4_tlb_fns	(0)
101  #define v4wb_tlb_fns	(0)
102  #define v4wbi_tlb_fns	(0)
103  #define v6wbi_tlb_fns	(0)
104  #define v7wbi_tlb_fns	(0)
105  
106  #define v3_user_fns	(0)
107  #define v4_user_fns	(0)
108  #define v4_mc_user_fns	(0)
109  #define v4wb_user_fns	(0)
110  #define v4wt_user_fns	(0)
111  #define v6_user_fns	(0)
112  #define xscale_mc_user_fns (0)
113  
114  #endif /*__ASSEMBLY__*/
115  
116  #endif /* _ASMARM_PGTABLE_H */
117