| GuanXuetao | b50f170 | 2011-01-15 18:16:59 +0800 | [diff] [blame] | 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 |