2 * arch/arm/include/asm/pgtable-nommu.h
4 * Copyright (C) 1995-2002 Russell King
5 * Copyright (C) 2004 Hyok S. Choi
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.
11 #ifndef _ASMARM_PGTABLE_NOMMU_H
12 #define _ASMARM_PGTABLE_NOMMU_H
16 #include <linux/slab.h>
17 #include <asm/processor.h>
21 * Trivial page table functions.
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)
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
34 #define PGDIR_SHIFT 21
36 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
37 #define PGDIR_MASK (~(PGDIR_SIZE-1))
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)
46 #define swapper_pg_dir ((pgd_t *) 0)
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 })
55 typedef pte_t *pte_addr_t;
58 * Mark the prot value as uncacheable and unbufferable.
60 #define pgprot_noncached(prot) (prot)
61 #define pgprot_writecombine(prot) (prot)
62 #define pgprot_dmacoherent(prot) (prot)
63 #define pgprot_device(prot) (prot)
67 * These would be in other places but having them here reduces the diffs.
69 extern unsigned int kobjsize(const void *objp);
72 * No page table caches to initialise.
74 #define pgtable_cache_init() do { } while (0)
77 * All 32bit addresses are effectively valid for vmalloc...
78 * Sort of meaningless for non-VM targets.
80 #define VMALLOC_START 0UL
81 #define VMALLOC_END 0xffffffffUL
83 #define FIRST_USER_ADDRESS 0UL
85 #include <asm-generic/pgtable.h>
90 * dummy tlb and user structures.
92 #define v3_tlb_fns (0)
93 #define v4_tlb_fns (0)
94 #define v4wb_tlb_fns (0)
95 #define v4wbi_tlb_fns (0)
96 #define v6wbi_tlb_fns (0)
97 #define v7wbi_tlb_fns (0)
99 #define v3_user_fns (0)
100 #define v4_user_fns (0)
101 #define v4_mc_user_fns (0)
102 #define v4wb_user_fns (0)
103 #define v4wt_user_fns (0)
104 #define v6_user_fns (0)
105 #define xscale_mc_user_fns (0)
107 #endif /*__ASSEMBLY__*/
109 #endif /* _ASMARM_PGTABLE_H */