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 #include <asm/cachetype.h> 20 21 #define L1_CACHE_SHIFT 6 22 #define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT) 23 24 /* 25 * Memory returned by kmalloc() may be used for DMA, so we must make 26 * sure that all such allocations are cache aligned. Otherwise, 27 * unrelated code may cause parts of the buffer to be read into the 28 * cache before the transfer is done, causing old data to be seen by 29 * the CPU. 30 */ 31 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES 32 33 #ifndef __ASSEMBLY__ 34 35 #define __read_mostly __attribute__((__section__(".data..read_mostly"))) 36 37 static inline int cache_line_size(void) 38 { 39 u32 cwg = cache_type_cwg(); 40 return cwg ? 4 << cwg : L1_CACHE_BYTES; 41 } 42 43 #endif /* __ASSEMBLY__ */ 44 45 #endif 46