arch/arm64/include/asm/cache.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_CACHE_H
  17 #define __ASM_CACHE_H
  18
  19 #define L1_CACHE_SHIFT          6
  20 #define L1_CACHE_BYTES          (1 << L1_CACHE_SHIFT)
  21
  22 /*
  23  * Memory returned by kmalloc() may be used for DMA, so we must make
  24  * sure that all such allocations are cache aligned. Otherwise,
  25  * unrelated code may cause parts of the buffer to be read into the
  26  * cache before the transfer is done, causing old data to be seen by
  27  * the CPU.
  28  */
  29 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
  30 #define ARCH_SLAB_MINALIGN      8
  31
  32 #endif