LXR uboot/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 */
  32static inline unsigned long virt_to_phys(void *x)
  33{
  34        return __virt_to_phys((unsigned long)(x));
  35}
  36
  37static 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 *deprecated*.
  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 deprecated.
 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 */
 137