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pgtable-nommu.h
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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 
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 #define io_remap_pfn_range remap_pfn_range
83 
84 
85 /*
86  * All 32bit addresses are effectively valid for vmalloc...
87  * Sort of meaningless for non-VM targets.
88  */
89 #define VMALLOC_START 0UL
90 #define VMALLOC_END 0xffffffffUL
91 
92 #define FIRST_USER_ADDRESS (0)
93 
94 #include <asm-generic/pgtable.h>
95 
96 #else
97 
98 /*
99  * dummy tlb and user structures.
100  */
101 #define v3_tlb_fns (0)
102 #define v4_tlb_fns (0)
103 #define v4wb_tlb_fns (0)
104 #define v4wbi_tlb_fns (0)
105 #define v6wbi_tlb_fns (0)
106 #define v7wbi_tlb_fns (0)
107 
108 #define v3_user_fns (0)
109 #define v4_user_fns (0)
110 #define v4_mc_user_fns (0)
111 #define v4wb_user_fns (0)
112 #define v4wt_user_fns (0)
113 #define v6_user_fns (0)
114 #define xscale_mc_user_fns (0)
115 
116 #endif /*__ASSEMBLY__*/
117 
118 #endif /* _ASMARM_PGTABLE_H */