#include <linux/init.h>
  #include <linux/module.h>
  #include <asm/sizes.h>
  #include <asm/page.h>
  #include <asm/addrspace.h>
  
  /*
   * This is the offset of the uncached section from its cached alias.
   *
   * Legacy platforms handle trivial transitions between cached and
   * uncached segments by making use of the 1:1 mapping relationship in
   * 512MB lowmem, others via a special uncached mapping.
   *
   * Default value only valid in 29 bit mode, in 32bit mode this will be
   * updated by the early PMB initialization code.
   */
  unsigned long cached_to_uncached = SZ_512M;
  unsigned long uncached_size = SZ_512M;
  unsigned long uncached_start, uncached_end;
  EXPORT_SYMBOL(uncached_start);
  EXPORT_SYMBOL(uncached_end);
  
  int virt_addr_uncached(unsigned long kaddr)
  {
  	return (kaddr >= uncached_start) && (kaddr < uncached_end);
  }
  EXPORT_SYMBOL(virt_addr_uncached);
  
  void __init uncached_init(void)
  {
  #if defined(CONFIG_29BIT) || !defined(CONFIG_MMU)
  	uncached_start = P2SEG;
  #else
  	uncached_start = memory_end;
  #endif
  	uncached_end = uncached_start + uncached_size;
  }
  
  void __init uncached_resize(unsigned long size)
  {
  	uncached_size = size;
  	uncached_end = uncached_start + uncached_size;
  }