From: Huacai Chen <chenhc@lemote.com>
Date: Thu, 26 Jun 2014 03:41:31 +0000 (+0800)
Subject: MIPS: Loongson-3: Enable the COP2 usage
X-Git-Tag: cleanup-for-v3.18~94^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef2f826c8f2ff1e4215968042139604633581a13;p=pandora-kernel.git

MIPS: Loongson-3: Enable the COP2 usage

Loongson-3 has some specific instructions (MMI/SIMD) in coprocessor 2.
COP2 isn't independent because it share COP1 (FPU)'s registers. This
patch enable the COP2 usage so user-space programs can use the MMI/SIMD
instructions. When COP2 exception happens, we enable both COP1 (FPU)
and COP2, only in this way the fp context can be saved and restored
correctly.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7189/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

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