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Linux kernel mirror (for testing)
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linux
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/config.h>
17#include <linux/slab.h>
18#include <asm/processor.h>
19#include <asm/page.h>
20#include <asm/io.h>
21
22/*
23 * Trivial page table functions.
24 */
25#define pgd_present(pgd) (1)
26#define pgd_none(pgd) (0)
27#define pgd_bad(pgd) (0)
28#define pgd_clear(pgdp)
29#define kern_addr_valid(addr) (1)
30#define pmd_offset(a, b) ((void *)0)
31/* FIXME */
32/*
33 * PMD_SHIFT determines the size of the area a second-level page table can map
34 * PGDIR_SHIFT determines what a third-level page table entry can map
35 */
36#define PGDIR_SHIFT 21
37
38#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
39#define PGDIR_MASK (~(PGDIR_SIZE-1))
40/* FIXME */
41
42#define PAGE_NONE __pgprot(0)
43#define PAGE_SHARED __pgprot(0)
44#define PAGE_COPY __pgprot(0)
45#define PAGE_READONLY __pgprot(0)
46#define PAGE_KERNEL __pgprot(0)
47
48//extern void paging_init(struct meminfo *, struct machine_desc *);
49#define swapper_pg_dir ((pgd_t *) 0)
50
51#define __swp_type(x) (0)
52#define __swp_offset(x) (0)
53#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
54#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
55#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
56
57
58typedef pte_t *pte_addr_t;
59
60static inline int pte_file(pte_t pte) { return 0; }
61
62/*
63 * ZERO_PAGE is a global shared page that is always zero: used
64 * for zero-mapped memory areas etc..
65 */
66#define ZERO_PAGE(vaddr) (virt_to_page(0))
67
68/*
69 * Mark the prot value as uncacheable and unbufferable.
70 */
71#define pgprot_noncached(prot) __pgprot(0)
72#define pgprot_writecombine(prot) __pgprot(0)
73
74
75/*
76 * These would be in other places but having them here reduces the diffs.
77 */
78extern unsigned int kobjsize(const void *objp);
79extern int is_in_rom(unsigned long);
80
81/*
82 * No page table caches to initialise.
83 */
84#define pgtable_cache_init() do { } while (0)
85#define io_remap_page_range remap_page_range
86#define io_remap_pfn_range remap_pfn_range
87
88#define MK_IOSPACE_PFN(space, pfn) (pfn)
89#define GET_IOSPACE(pfn) 0
90#define GET_PFN(pfn) (pfn)
91
92
93/*
94 * All 32bit addresses are effectively valid for vmalloc...
95 * Sort of meaningless for non-VM targets.
96 */
97#define VMALLOC_START 0
98#define VMALLOC_END 0xffffffff
99
100#define FIRST_USER_ADDRESS (0)
101
102#else
103
104/*
105 * dummy tlb and user structures.
106 */
107#define v3_tlb_fns (0)
108#define v4_tlb_fns (0)
109#define v4wb_tlb_fns (0)
110#define v4wbi_tlb_fns (0)
111#define v6_tlb_fns (0)
112
113#define v3_user_fns (0)
114#define v4_user_fns (0)
115#define v4_mc_user_fns (0)
116#define v4wb_user_fns (0)
117#define v4wt_user_fns (0)
118#define v6_user_fns (0)
119#define xscale_mc_user_fns (0)
120
121#endif /*__ASSEMBLY__*/
122
123#endif /* _ASMARM_PGTABLE_H */