File 0009-bitwise.h-swap-bitwise-for-different-CPU-e... of Package bcache-tools

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File 0009-bitwise.h-swap-bitwise-for-different-CPU-endians.patch of Package bcache-tools

From da01240e8d4e2ea1726601e1537354ccb29e9e66 Mon Sep 17 00:00:00 2001
From: Coly Li <colyli@suse.de>
Date: Thu, 12 Dec 2019 20:46:24 +0800
Subject: [PATCH 14/16] bitwise.h: swap bitwise for different CPU endians
Git-commit: da01240e8d4e2ea1726601e1537354ccb29e9e66
Patch-mainline: bcache-tools-1.1
References: bsc#1139948

To support bcache-tools for s390x (big endian machine), the following
routines are required for writting super block out,
        cpu_to_le64()
        cpu_to_le32()
        cpu_to_le16()
The code is cherry-picked from include/uapi/linux/swab.h of Linux
kernel v5.3 source code.

Signed-off-by: Coly Li <colyli@suse.de>
---
 bitwise.h | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 bitwise.h

diff --git a/bitwise.h b/bitwise.h
new file mode 100644
index 0000000..968002f
--- /dev/null
+++ b/bitwise.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/**
+ * Author: Coly Li
+ *
+ * Cherry-picked from include/uapi/linux/swab.h of
+ * Linux kernel v5.3 source code.
+ */
+
+#include <linux/types.h>
+#include <asm/swab.h>
+
+#ifndef __BCH_BITWISE_H
+#define __BCH_BITWISE_H
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define BCH_LITTLE_ENDIAN_LOCAL 1
+#else
+#undef BCH_LITTLE_ENDIAN_LOCAL
+#endif
+
+
+#define __swab16(x) ((__u16)(			\
+	(((__u16)(x) & (__u16)0x00ffU) << 8) |	\
+	(((__u16)(x) & (__u16)0xff00U) >> 8)))
+
+#define __swab32(x) ((__u32)(				\
+	(((__u32)(x) & (__u32)0x000000ffUL) << 24) |	\
+	(((__u32)(x) & (__u32)0x0000ff00UL) <<  8) |	\
+	(((__u32)(x) & (__u32)0x00ff0000UL) >>  8) |	\
+	(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
+
+#define __swab64(x) ((__u64)(					\
+	(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) |	\
+	(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) |	\
+	(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) |	\
+	(((__u64)(x) & (__u64)0x00000000ff000000ULL) <<  8) |	\
+	(((__u64)(x) & (__u64)0x000000ff00000000ULL) >>  8) |	\
+	(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) |	\
+	(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) |	\
+	(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
+
+
+#ifdef BCH_LITTLE_ENDIAN_LOCAL
+/* For little endian*/
+#define cpu_to_le16(val)	((__le16)(val))
+#define cpu_to_le32(val)	((__le32)(val))
+#define cpu_to_le64(val)	((__le64)(val))
+#else
+/* For big endian */
+#define cpu_to_le16(val)	((__be16)__swab16((__u16)(val)))
+#define cpu_to_le32(val)	((__be32)__swab32((__u32)(val)))
+#define cpu_to_le64(val)	((__be64)__swab64((__u64)(val)))
+#endif
+
+#endif
-- 
2.25.0

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