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From: Ralf Baechle <ralf@linux-mips.org>
To: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org,
	Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Subject: Re: [PATCH v3 1/3] Loongson-2F: Flush the branch target history such as BTB and RAS
Date: Wed, 17 Mar 2010 16:11:24 +0100	[thread overview]
Message-ID: <20100317151124.GC4554@linux-mips.org> (raw)
In-Reply-To: <05e2ba2596f23fa4dda64d63ce2480504b1be4ac.1268453720.git.wuzhangjin@gmail.com>

On Sat, Mar 13, 2010 at 12:34:15PM +0800, Wu Zhangjin wrote:

> 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:
> 
> "When switching from user mode to kernel mode, you should flush the
> branch target history such as BTB and RAS."
> 
> This patch did clear BTB(branch target buffer), forbid RAS(return
> address stack) via Loongson-2F's 64bit diagnostic register.
> 
> [1] Chinese Version: http://www.loongson.cn/uploadfile/file/200808211
> [2] English Version of Chapter 15:
> http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source

Thanks, applied.

  Ralf

  reply	other threads:[~2010-03-17 15:11 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-13  4:34 [PATCH v3 0/3] Workaround the Out-of-order Issue of Loongson-2F Wu Zhangjin
2010-03-13  4:34 ` [PATCH v3 1/3] Loongson-2F: Flush the branch target history such as BTB and RAS Wu Zhangjin
2010-03-17 15:11   ` Ralf Baechle [this message]
2010-04-02 14:54   ` Andreas Barth
2010-04-03  1:42     ` Wu Zhangjin
2010-04-06 19:10       ` Andreas Barth
2010-04-07  7:30         ` Wu Zhangjin
2010-04-10  8:10           ` Andreas Barth
2010-04-12  3:33             ` Wu Zhangjin
2010-04-03  1:53     ` Zhang Le
2010-04-03  3:11       ` Andreas Barth
2010-03-13  4:34 ` [PATCH v3 2/3] Loongson-2F: Enable fixups of binutils 2.20.1 Wu Zhangjin
2010-03-17 13:52   ` Ralf Baechle
2010-03-27 16:29     ` Zhang Le
2010-03-27 17:20       ` Zhang Le
2010-03-27 23:17         ` zhangfx
2010-04-07 13:02     ` Wu Zhangjin
2010-03-13  4:34 ` [PATCH v3 3/3] Loongson-2F: Fixup of problems introduced by -mfix-loongson2f-jump " Wu Zhangjin
2010-03-17 15:02   ` Ralf Baechle
2010-03-27 17:13     ` Zhang Le
2010-04-07 12:57     ` Wu Zhangjin

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