LXR linux/arch/unicore32/include/asm/cache.h

   1/*
   2 * linux/arch/unicore32/include/asm/cache.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __UNICORE_CACHE_H__
  13#define __UNICORE_CACHE_H__
  14
  15#define L1_CACHE_SHIFT          (5)
  16#define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
  17
  18/*
  19 * Memory returned by kmalloc() may be used for DMA, so we must make
  20 * sure that all such allocations are cache aligned. Otherwise,
  21 * unrelated code may cause parts of the buffer to be read into the
  22 * cache before the transfer is done, causing old data to be seen by
  23 * the CPU.
  24 */
  25#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
  26
  27#endif
  28