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    Subject[tip:x86/build] tools/include: Add byteshift headers for endian access
    Commit-ID:  a07f7672d7cf0ff0d6e548a9feb6e0bd016d9c6c
    Gitweb: http://git.kernel.org/tip/a07f7672d7cf0ff0d6e548a9feb6e0bd016d9c6c
    Author: Matt Fleming <matt.fleming@intel.com>
    AuthorDate: Tue, 28 Feb 2012 13:37:20 +0000
    Committer: H. Peter Anvin <hpa@zytor.com>
    CommitDate: Tue, 28 Feb 2012 10:22:51 -0800

    tools/include: Add byteshift headers for endian access

    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>
    Link: http://lkml.kernel.org/r/1330436245-24875-2-git-send-email-matt@console-pimps.org
    Signed-off-by: H. Peter Anvin <hpa@zytor.com>
    ---
    tools/include/tools/be_byteshift.h | 70 ++++++++++++++++++++++++++++++++++++
    tools/include/tools/le_byteshift.h | 70 ++++++++++++++++++++++++++++++++++++
    2 files changed, 140 insertions(+), 0 deletions(-)

    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 */

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