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6 Commits

Author SHA1 Message Date
Wu Zhangjin
b197b62866 MIPS: Loongson-2F: Use CONFIG_CPU_JUMP_WORKAROUNDS to control workarounds. 
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/1106/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2010-04-30 20:52:58 +01:00
Wu Zhangjin
f1df323924 MIPS: Loongson-2F: Flush the branch target history in BTB and RAS 
As per chapter 15 "Errata: Issue of Out-of-order in loongson"[1] to work
around the Loongson 2F erratum we need to do:

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

[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@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Patchwork: http://patchwork.linux-mips.org/patch/1066/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2010-04-12 17:26:15 +01:00
David Daney
82622284dd MIPS: Put PGD in C0_CONTEXT for 64-bit R2 processors. 
Processors that support the mips64r2 ISA can in four instructions
convert a shifted PGD pointer stored in the upper bits of c0_context
into a usable pointer.  By doing this we save a memory load and
associated potential cache miss in the TLB exception handlers.

Since the upper bits of c0_context were holding the CPU number, we
move this to the upper bits of c0_xcontext which doesn't have enough
bits to hold the PGD pointer, but has plenty for the CPU number.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2009-12-17 01:57:01 +00:00
David Daney
362e696428 MIPS: Reorder operations in stackframe.h for better scheduling 
Reorder PT ops to avoid pipeline stalls.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2009-12-17 01:56:57 +00:00
David Daney
2a219b0eaa MIPS: Cavium OCTEON multiplier state preservation. 
For OCTEON, implement a save and restore of the multiplier state
across context switches.

Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2009-01-11 09:57:24 +00:00
Ralf Baechle
384740dc49 MIPS: Move headfiles to new location below arch/mips/include 
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 2008-10-11 16:18:52 +01:00