linux-kernel - [PATCH 0/3] Workaround the Out-of-order Issue of Loongson-2F

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Date:	Wed, 10 Mar 2010 01:12:30 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>, Greg KH <gregkh@...e.de>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Wu Zhangjin <wuzhangjin@...il.com>
Subject: [PATCH 0/3] Workaround the Out-of-order Issue of Loongson-2F

From: Wu Zhangjin <wuzhangjin@...il.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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