v4.19.13 snapshot.
diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
new file mode 100644
index 0000000..5ee5bca
--- /dev/null
+++ b/arch/arm64/include/asm/cache.h
@@ -0,0 +1,89 @@
+/*
+ * 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/cputype.h>
+
+#define CTR_L1IP_SHIFT 14
+#define CTR_L1IP_MASK 3
+#define CTR_DMINLINE_SHIFT 16
+#define CTR_IMINLINE_SHIFT 0
+#define CTR_ERG_SHIFT 20
+#define CTR_CWG_SHIFT 24
+#define CTR_CWG_MASK 15
+#define CTR_IDC_SHIFT 28
+#define CTR_DIC_SHIFT 29
+
+#define CTR_CACHE_MINLINE_MASK \
+ (0xf << CTR_DMINLINE_SHIFT | 0xf << CTR_IMINLINE_SHIFT)
+
+#define CTR_L1IP(ctr) (((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK)
+
+#define ICACHE_POLICY_VPIPT 0
+#define ICACHE_POLICY_VIPT 2
+#define ICACHE_POLICY_PIPT 3
+
+#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 (128)
+
+#ifndef __ASSEMBLY__
+
+#include <linux/bitops.h>
+
+#define ICACHEF_ALIASING 0
+#define ICACHEF_VPIPT 1
+extern unsigned long __icache_flags;
+
+/*
+ * Whilst the D-side always behaves as PIPT on AArch64, aliasing is
+ * permitted in the I-cache.
+ */
+static inline int icache_is_aliasing(void)
+{
+ return test_bit(ICACHEF_ALIASING, &__icache_flags);
+}
+
+static inline int icache_is_vpipt(void)
+{
+ return test_bit(ICACHEF_VPIPT, &__icache_flags);
+}
+
+static inline u32 cache_type_cwg(void)
+{
+ return (read_cpuid_cachetype() >> CTR_CWG_SHIFT) & CTR_CWG_MASK;
+}
+
+#define __read_mostly __attribute__((__section__(".data..read_mostly")))
+
+static inline int cache_line_size(void)
+{
+ u32 cwg = cache_type_cwg();
+ return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif