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Linux/arch/arm/include/asm/pgtable-nommu.h

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  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)  __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  */
 74 extern 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 

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