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 /*
58  * ZERO_PAGE is a global shared page that is always zero: used
59  * for zero-mapped memory areas etc..
60  */
61 #define ZERO_PAGE(vaddr)	(virt_to_page(0))
62 
63 /*
64  * Mark the prot value as uncacheable and unbufferable.
65  */
66 #define pgprot_noncached(prot)	(prot)
67 #define pgprot_writecombine(prot) (prot)
68 #define pgprot_dmacoherent(prot) (prot)
69 #define pgprot_device(prot)	(prot)
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 
82 /*
83  * All 32bit addresses are effectively valid for vmalloc...
84  * Sort of meaningless for non-VM targets.
85  */
86 #define	VMALLOC_START	0UL
87 #define	VMALLOC_END	0xffffffffUL
88 
89 #define FIRST_USER_ADDRESS      0UL
90 
91 #include <asm-generic/pgtable.h>
92 
93 #else
94 
95 /*
96  * dummy tlb and user structures.
97  */
98 #define v3_tlb_fns	(0)
99 #define v4_tlb_fns	(0)
100 #define v4wb_tlb_fns	(0)
101 #define v4wbi_tlb_fns	(0)
102 #define v6wbi_tlb_fns	(0)
103 #define v7wbi_tlb_fns	(0)
104 
105 #define v3_user_fns	(0)
106 #define v4_user_fns	(0)
107 #define v4_mc_user_fns	(0)
108 #define v4wb_user_fns	(0)
109 #define v4wt_user_fns	(0)
110 #define v6_user_fns	(0)
111 #define xscale_mc_user_fns (0)
112 
113 #endif /*__ASSEMBLY__*/
114 
115 #endif /* _ASMARM_PGTABLE_H */
116