Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm64 / include / asm / cache.h

diff --git a/kernel/arch/arm64/include/asm/cache.h b/kernel/arch/arm64/include/asm/cache.h
new file mode 100644 (file)
index 0000000..bde4499
--- /dev/null
+++ b/kernel/arch/arm64/include/asm/cache.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __ASM_CACHE_H
+#define __ASM_CACHE_H
+
+#include <asm/cachetype.h>
+
+#define L1_CACHE_SHIFT         6
+#define L1_CACHE_BYTES         (1 << L1_CACHE_SHIFT)
+
+/*
+ * Memory returned by kmalloc() may be used for DMA, so we must make
+ * sure that all such allocations are cache aligned. Otherwise,
+ * unrelated code may cause parts of the buffer to be read into the
+ * cache before the transfer is done, causing old data to be seen by
+ * the CPU.
+ */
+#define ARCH_DMA_MINALIGN      L1_CACHE_BYTES
+
+#ifndef __ASSEMBLY__
+
+#define __read_mostly __attribute__((__section__(".data..read_mostly")))
+
+static inline int cache_line_size(void)
+{
+       u32 cwg = cache_type_cwg();
+       return cwg ? 4 << cwg : L1_CACHE_BYTES;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif