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
71
72 /*
73 * These would be in other places but having them here reduces the diffs.
74 */
75 extern unsigned int kobjsize(const void *objp);
76
77 /*
78 * No page table caches to initialise.
79 */
80 #define pgtable_cache_init() do { } while (0)
81 #define io_remap_page_range remap_page_range
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 0
90 #define VMALLOC_END 0xffffffff
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 */
119
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