| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <d513f16856e499e82f0b4e428c97fe06afb5a426.1268153722.git.wuzhangjin@gmail.com> Date: Wed, 10 Mar 2010 01:12:31 +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 1/3] Loongson-2F: Flush the branch target history such as BTB and RAS 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: "When switching from user model to kernel model, you should flush the branch target history such as BTB and RAS." This patch did clear BTB(branch target buffer), forbid RAS(row address strobe) 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 Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com> --- arch/mips/include/asm/stackframe.h | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index 3b6da33..b84cfda 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -121,6 +121,25 @@ .endm #else .macro get_saved_sp /* Uniprocessor variation */ +#ifdef CONFIG_CPU_LOONGSON2F + /* + * Clear BTB(branch target buffer), forbid RAS(row address + * strobe) to workaround the Out-of-oder Issue in Loongson2F + * via it's diagnostic register. + */ + move k0, ra + jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: jal 1f + nop +1: move ra, k0 + li k0, 3 + mtc0 k0, $22 +#endif /* CONFIG_CPU_LOONGSON2F */ #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) lui k1, %hi(kernelsp) #else -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists