1/*
2 *  linux/include/asm-arm/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#include <asm/io.h>
20
21/*
22 * Trivial page table functions.
23 */
24#define pgd_present(pgd)	(1)
25#define pgd_none(pgd)		(0)
26#define pgd_bad(pgd)		(0)
27#define pgd_clear(pgdp)
28#define kern_addr_valid(addr)	(1)
29#define	pmd_offset(a, b)	((void *)0)
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
39#define PAGE_NONE	__pgprot(0)
40#define PAGE_SHARED	__pgprot(0)
41#define PAGE_COPY	__pgprot(0)
42#define PAGE_READONLY	__pgprot(0)
43#define PAGE_KERNEL	__pgprot(0)
44
45#define swapper_pg_dir ((pgd_t *) 0)
46
47#define __swp_type(x)		(0)
48#define __swp_offset(x)		(0)
49#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
50#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
51#define __swp_entry_to_pte(x)	((pte_t) { (x).val })
52
53
54typedef pte_t *pte_addr_t;
55
56static inline int pte_file(pte_t pte) { return 0; }
57
58/*
59 * ZERO_PAGE is a global shared page that is always zero: used
60 * for zero-mapped memory areas etc..
61 */
62#define ZERO_PAGE(vaddr)	(virt_to_page(0))
63
64/*
65 * Mark the prot value as uncacheable and unbufferable.
66 */
67#define pgprot_noncached(prot)	__pgprot(0)
68#define pgprot_writecombine(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);
75extern int is_in_rom(unsigned long);
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#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 v6_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