[RFC][PATCH 1/6] tools/include: Add byteshift headers for endian access

[Matt Fleming <matt@console-pimps.org>]

From: Matt Fleming <matt.fleming@intel.com>

There are various hostprogs in the kernel that are rolling their own
implementations of {get,put}_unaligned_le*(). Copy the byteshift
headers from include/linux/unaligned so that they can all use a single
implementation.

This requires changing some of the data types to the userspace
exported ones (u32 -> __u32, etc).

Signed-off-by: Matt Fleming <matt.fleming@intel.com>
---
 tools/include/tools/be_byteshift.h |   70 ++++++++++++++++++++++++++++++++++++
 tools/include/tools/le_byteshift.h |   70 ++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+), 0 deletions(-)
 create mode 100644 tools/include/tools/be_byteshift.h
 create mode 100644 tools/include/tools/le_byteshift.h

diff --git a/tools/include/tools/be_byteshift.h b/tools/include/tools/be_byteshift.h
new file mode 100644
index 0000000..f4912e2
--- /dev/null
+++ b/tools/include/tools/be_byteshift.h
@@ -0,0 +1,70 @@
+#ifndef _TOOLS_BE_BYTESHIFT_H
+#define _TOOLS_BE_BYTESHIFT_H
+
+#include <linux/types.h>
+
+static inline __u16 __get_unaligned_be16(const __u8 *p)
+{
+	return p[0] << 8 | p[1];
+}
+
+static inline __u32 __get_unaligned_be32(const __u8 *p)
+{
+	return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
+}
+
+static inline __u64 __get_unaligned_be64(const __u8 *p)
+{
+	return (__u64)__get_unaligned_be32(p) << 32 |
+	       __get_unaligned_be32(p + 4);
+}
+
+static inline void __put_unaligned_be16(__u16 val, __u8 *p)
+{
+	*p++ = val >> 8;
+	*p++ = val;
+}
+
+static inline void __put_unaligned_be32(__u32 val, __u8 *p)
+{
+	__put_unaligned_be16(val >> 16, p);
+	__put_unaligned_be16(val, p + 2);
+}
+
+static inline void __put_unaligned_be64(__u64 val, __u8 *p)
+{
+	__put_unaligned_be32(val >> 32, p);
+	__put_unaligned_be32(val, p + 4);
+}
+
+static inline __u16 get_unaligned_be16(const void *p)
+{
+	return __get_unaligned_be16((const __u8 *)p);
+}
+
+static inline __u32 get_unaligned_be32(const void *p)
+{
+	return __get_unaligned_be32((const __u8 *)p);
+}
+
+static inline __u64 get_unaligned_be64(const void *p)
+{
+	return __get_unaligned_be64((const __u8 *)p);
+}
+
+static inline void put_unaligned_be16(__u16 val, void *p)
+{
+	__put_unaligned_be16(val, p);
+}
+
+static inline void put_unaligned_be32(__u32 val, void *p)
+{
+	__put_unaligned_be32(val, p);
+}
+
+static inline void put_unaligned_be64(__u64 val, void *p)
+{
+	__put_unaligned_be64(val, p);
+}
+
+#endif /* _TOOLS_BE_BYTESHIFT_H */
diff --git a/tools/include/tools/le_byteshift.h b/tools/include/tools/le_byteshift.h
new file mode 100644
index 0000000..c99d45a
--- /dev/null
+++ b/tools/include/tools/le_byteshift.h
@@ -0,0 +1,70 @@
+#ifndef _TOOLS_LE_BYTESHIFT_H
+#define _TOOLS_LE_BYTESHIFT_H
+
+#include <linux/types.h>
+
+static inline __u16 __get_unaligned_le16(const __u8 *p)
+{
+	return p[0] | p[1] << 8;
+}
+
+static inline __u32 __get_unaligned_le32(const __u8 *p)
+{
+	return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
+}
+
+static inline __u64 __get_unaligned_le64(const __u8 *p)
+{
+	return (__u64)__get_unaligned_le32(p + 4) << 32 |
+	       __get_unaligned_le32(p);
+}
+
+static inline void __put_unaligned_le16(__u16 val, __u8 *p)
+{
+	*p++ = val;
+	*p++ = val >> 8;
+}
+
+static inline void __put_unaligned_le32(__u32 val, __u8 *p)
+{
+	__put_unaligned_le16(val >> 16, p + 2);
+	__put_unaligned_le16(val, p);
+}
+
+static inline void __put_unaligned_le64(__u64 val, __u8 *p)
+{
+	__put_unaligned_le32(val >> 32, p + 4);
+	__put_unaligned_le32(val, p);
+}
+
+static inline __u16 get_unaligned_le16(const void *p)
+{
+	return __get_unaligned_le16((const __u8 *)p);
+}
+
+static inline __u32 get_unaligned_le32(const void *p)
+{
+	return __get_unaligned_le32((const __u8 *)p);
+}
+
+static inline __u64 get_unaligned_le64(const void *p)
+{
+	return __get_unaligned_le64((const __u8 *)p);
+}
+
+static inline void put_unaligned_le16(__u16 val, void *p)
+{
+	__put_unaligned_le16(val, p);
+}
+
+static inline void put_unaligned_le32(__u32 val, void *p)
+{
+	__put_unaligned_le32(val, p);
+}
+
+static inline void put_unaligned_le64(__u64 val, void *p)
+{
+	__put_unaligned_le64(val, p);
+}
+
+#endif /* _TOOLS_LE_BYTESHIFT_H */
-- 
1.7.4.4