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
55typedef 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)	__pgprot(0)
67#define pgprot_writecombine(prot) __pgprot(0)
68#define pgprot_dmacoherent(prot) __pgprot(0)
69
70
71/*
72 * These would be in other places but having them here reduces the diffs.
73 */
74extern unsigned int kobjsize(const void *objp);
75
76/*
77 * No page table caches to initialise.
78 */
79#define pgtable_cache_init()	do { } while (0)
80
81/*
82 * All 32bit addresses are effectively valid for vmalloc...
83 * Sort of meaningless for non-VM targets.
84 */
85#define	VMALLOC_START	0UL
86#define	VMALLOC_END	0xffffffffUL
87
88#define FIRST_USER_ADDRESS      0UL
89
90#include <asm-generic/pgtable.h>
91
92#else
93
94/*
95 * dummy tlb and user structures.
96 */
97#define v3_tlb_fns	(0)
98#define v4_tlb_fns	(0)
99#define v4wb_tlb_fns	(0)
100#define v4wbi_tlb_fns	(0)
101#define v6wbi_tlb_fns	(0)
102#define v7wbi_tlb_fns	(0)
103
104#define v3_user_fns	(0)
105#define v4_user_fns	(0)
106#define v4_mc_user_fns	(0)
107#define v4wb_user_fns	(0)
108#define v4wt_user_fns	(0)
109#define v6_user_fns	(0)
110#define xscale_mc_user_fns (0)
111
112#endif /*__ASSEMBLY__*/
113
114#endif /* _ASMARM_PGTABLE_H */
115