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
  15 #define PHYS_OFFSET     UL(0xf0000000)
  16
  17 #define __virt_to_bus(x)        __virt_to_phys(x)
  18 #define __bus_to_virt(x)        __phys_to_virt(x)
  19
  20 #ifdef CONFIG_DISCONTIGMEM
  21
  22 /*
  23  * The nodes are the followings:
  24  *
  25  *   node 0: 0xf000.0000 - 0xf3ff.ffff
  26  *   node 1: 0xf400.0000 - 0xf7ff.ffff
  27  *   node 2: 0xf800.0000 - 0xfbff.ffff
  28  *   node 3: 0xfc00.0000 - 0xffff.ffff
  29  */
  30
  31 /*
  32  * Given a kernel address, find the home node of the underlying memory.
  33  */
  34 #define KVADDR_TO_NID(addr) \
  35         (((unsigned long)(addr) - PAGE_OFFSET) >> NODE_MAX_MEM_SHIFT)
  36
  37 /*
  38  * Given a page frame number, convert it to a node id.
  39  */
  40 #define PFN_TO_NID(pfn) \
  41         (((pfn) - PHYS_PFN_OFFSET) >> (NODE_MAX_MEM_SHIFT - PAGE_SHIFT))
  42
  43 /*
  44  * Given a kaddr, ADDR_TO_MAPBASE finds the owning node of the memory
  45  * and return the mem_map of that node.
  46  */
  47 #define ADDR_TO_MAPBASE(kaddr)  NODE_MEM_MAP(KVADDR_TO_NID(kaddr))
  48
  49 /*
  50  * Given a page frame number, find the owning node of the memory
  51  * and return the mem_map of that node.
  52  */
  53 #define PFN_TO_MAPBASE(pfn)     NODE_MEM_MAP(PFN_TO_NID(pfn))
  54
  55 /*
  56  *  Given a kaddr, LOCAL_MEM_MAP finds the owning node of the memory
  57  *  and returns the index corresponding to the appropriate page in the
  58  *  node's mem_map.
  59  */
  60 #define LOCAL_MAP_NR(addr) \
  61         (((unsigned long)(addr) & (NODE_MAX_MEM_SIZE - 1)) >> PAGE_SHIFT)
  62
  63 #define NODE_MAX_MEM_SHIFT      26
  64 #define NODE_MAX_MEM_SIZE       (1 << NODE_MAX_MEM_SHIFT)
  65
  66 #endif /* CONFIG_DISCONTIGMEM */
  67
  68 #endif /* __ASM_ARCH_MEMORY_H */