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    Subject[PATCH 0/3] Workaround the Out-of-order Issue of Loongson-2F
    Date
    From: Wu Zhangjin <wuzhangjin@gmail.com>

    As the Chapter 15: "Errata: Issue of Out-of-order in loongson"[1] shows, to
    workaround the Issue of Loongson-2F,We need to do:

    o When switching from user model to kernel model, you should flush the branch
    target history such as BTB and RAS.

    o Doing some tricks to the indirect branch target to make sure that the
    indirect branch target can not be in the I/O region.

    This patchset applied the above methods and for the binutils patch[3] have been
    merged into binutils 2.20.1, so, it's time to upstream this patchset now.
    without this patch, the machines will hang when the instruction sequence hit
    the Out-of-order Issue of Loongson-2F, therefore, this patchset is very urgent
    for both 2.6.33 and 2.6.34.

    [1] Chinese Version: http://www.loongson.cn/uploadfile/file/20080821113149.pdf
    [2] English Version of Chapter 15:
    http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source
    [3] http://sourceware.org/ml/binutils/2009-11/msg00387.html

    Regards,
    Wu Zhangjin

    Wu Zhangjin (3):
    Loongson-2F: Flush the branch target history such as BTB and RAS
    Loongson-2F: Enable fixups of binutils 2.20.1
    Loongson-2F: Fixup of problems introduced by -mfix-loongson2f-jump of
    binutils 2.20.1

    arch/mips/Makefile | 4 +++-
    arch/mips/include/asm/stackframe.h | 19 +++++++++++++++++++
    arch/mips/loongson/common/reset.c | 12 +++++++++++-
    3 files changed, 33 insertions(+), 2 deletions(-)

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