include/asm-arm/arch-aaec2000/memory.h

   1 /*
   2  *  linux/include/asm-arm/arch-aaec2000/memory.h
   3  *
   4  *  Copyright (c) 2005 Nicolas Bellido Y Ortega
   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
  11 #ifndef __ASM_ARCH_MEMORY_H
  12 #define __ASM_ARCH_MEMORY_H
  13
  14 #include <linux/config.h>
  15
  16 #define PHYS_OFFSET     (0xf0000000UL)
  17
  18 #define __virt_to_bus(x)        __virt_to_phys(x)
  19 #define __bus_to_virt(x)        __phys_to_virt(x)
  20
  21 #ifdef CONFIG_DISCONTIGMEM
  22
  23 /*
  24  * The nodes are the followings:
  25  *
  26  *   node 0: 0xf000.0000 - 0xf3ff.ffff
  27  *   node 1: 0xf400.0000 - 0xf7ff.ffff
  28  *   node 2: 0xf800.0000 - 0xfbff.ffff
  29  *   node 3: 0xfc00.0000 - 0xffff.ffff
  30  */
  31
  32 /*
  33  * Given a kernel address, find the home node of the underlying memory.
  34  */
  35 #define KVADDR_TO_NID(addr) \
  36         (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
  37
  38 /*
  39  * Given a page frame number, convert it to a node id.
  40  */
  41 #define PFN_TO_NID(pfn) \
  42         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
  43
  44 /*
  45  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  46  * and return the mem_map of that node.
  47  */
  48 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  49
  50 /*
  51  * Given a page frame number, find the owning node of the memory
  52  * and return the mem_map of that node.
  53  */
  54 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  55
  56 /*
  57  *  Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  58  *  and returns the index corresponding to the appropriate page in the
  59  *  node's mem_map.
  60  */
  61 #define LOCAL_MAP_NR(addr) \
  62         (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
  63
  64 #define NODE_MAX_MEM_SHIFT      26
  65 #define NODE_MAX_MEM_SIZE       (1 << NODE_MAX_MEM_SHIFT)
  66
  67 #else
  68
  69 #define PFN_TO_NID(addr)        (0)
  70
  71 #endif /* CONFIG_DISCONTIGMEM */
  72
  73 #endif /* __ASM_ARCH_MEMORY_H */