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