include/asm-arm/memory.h

   1 /*
   2  *  linux/include/asm-arm/memory.h
   3  *
   4  *  Copyright (C) 2000-2002 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Note: this file should not be included by non-asm/.h files
  11  */
  12 #ifndef __ASM_ARM_MEMORY_H
  13 #define __ASM_ARM_MEMORY_H
  14
  15 #if 0   /* XXX###XXX */
  16
  17 #include <linux/config.h>
  18 #include <asm/arch/memory.h>
  19
  20 /*
  21  * PFNs are used to describe any physical page; this means
  22  * PFN 0 == physical address 0.
  23  *
  24  * This is the PFN of the first RAM page in the kernel
  25  * direct-mapped view.  We assume this is the first page
  26  * of RAM in the mem_map as well.
  27  */
  28 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  29
  30 /*
  31  * These are *only* valid on the kernel direct mapped RAM memory.
  32  */
  33 static inline unsigned long virt_to_phys(void *x)
  34 {
  35         return __virt_to_phys((unsigned long)(x));
  36 }
  37
  38 static inline void *phys_to_virt(unsigned long x)
  39 {
  40         return (void *)(__phys_to_virt((unsigned long)(x)));
  41 }
  42
  43 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
  44 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
  45
  46 /*
  47  * Virtual <-> DMA view memory address translations
  48  * Again, these are *only* valid on the kernel direct mapped RAM
  49  * memory.  Use of these is *depreciated*.
  50  */
  51 #define virt_to_bus(x)          (__virt_to_bus((unsigned long)(x)))
  52 #define bus_to_virt(x)          ((void *)(__bus_to_virt((unsigned long)(x))))
  53
  54 /*
  55  * Conversion between a struct page and a physical address.
  56  *
  57  * Note: when converting an unknown physical address to a
  58  * struct page, the resulting pointer must be validated
  59  * using VALID_PAGE().  It must return an invalid struct page
  60  * for any physical address not corresponding to a system
  61  * RAM address.
  62  *
  63  *  page_to_pfn(page)   convert a struct page * to a PFN number
  64  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
  65  *  pfn_valid(pfn)      indicates whether a PFN number is valid
  66  *
  67  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
  68  *  virt_addr_valid(k)  indicates whether a virtual address is valid
  69  */
  70 #ifndef CONFIG_DISCONTIGMEM
  71
  72 #define page_to_pfn(page)       (((page) - mem_map) + PHYS_PFN_OFFSET)
  73 #define pfn_to_page(pfn)        ((mem_map + (pfn)) - PHYS_PFN_OFFSET)
  74 #define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
  75
  76 #define virt_to_page(kaddr)     (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
  77 #define virt_addr_valid(kaddr)  ((kaddr) >= PAGE_OFFSET && (kaddr) < (unsigned long)high_memory)
  78
  79 #define PHYS_TO_NID(addr)       (0)
  80
  81 #define VALID_PAGE(page)        ((page - mem_map) < max_mapnr)
  82
  83 #else
  84
  85 /*
  86  * This is more complex.  We have a set of mem_map arrays spread
  87  * around in memory.
  88  */
  89 #define page_to_pfn(page)                                       \
  90         (((page) - page_zone(page)->zone_mem_map)               \
  91           + (page_zone(page)->zone_start_paddr >> PAGE_SHIFT))
  92
  93 #define pfn_to_page(pfn)                                        \
  94         (PFN_TO_MAPBASE(pfn) + LOCAL_MAP_NR((pfn) << PAGE_SHIFT))
  95
  96 #define pfn_valid(pfn)                                          \
  97   ({                                                            \
  98         unsigned int node = PFN_TO_NID(pfn);                    \
  99         struct pglist_data *nd = NODE_DATA(node);               \
 100         ((node < NR_NODES) &&                                   \
 101          ((pfn - (nd->node_start_paddr >> PAGE_SHIFT)) < nd->node_size));\
 102    })
 103
 104 #define virt_to_page(kaddr)                                     \
 105         (ADDR_TO_MAPBASE(kaddr) + LOCAL_MAP_NR(kaddr))
 106
 107 #define virt_addr_valid(kaddr)  (KVADDR_TO_NID(kaddr) < NR_NODES)
 108
 109 /*
 110  * Common discontigmem stuff.
 111  *  PHYS_TO_NID is used by the ARM kernel/setup.c
 112  */
 113 #define PHYS_TO_NID(addr)       PFN_TO_NID((addr) >> PAGE_SHIFT)
 114
 115 /*
 116  * 2.4 compatibility
 117  *
 118  * VALID_PAGE returns a non-zero value if given page pointer is valid.
 119  * This assumes all node's mem_maps are stored within the node they
 120  * refer to.  This is actually inherently buggy.
 121  */
 122 #define VALID_PAGE(page) \
 123 ({ unsigned int node = KVADDR_TO_NID(page); \
 124    ((node < NR_NODES) && \
 125      ((unsigned)((page) - NODE_MEM_MAP(node)) < NODE_DATA(node)->node_size)); \
 126 })
 127
 128 #endif
 129
 130 /*
 131  * We should really eliminate virt_to_bus() here - it's depreciated.
 132  */
 133 #define page_to_bus(page)       (virt_to_bus(page_address(page)))
 134
 135 #endif  /* XXX###XXX */
 136
 137 #endif  /* __ASM_ARM_MEMORY_H */