MIPS: kernel: cpu-probe: Detect unique RI/XI exceptions

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Detect if the core supports unique exception codes for the
Read-Inhibit and Execute-Inhibit exceptions and set the
option accordingly. The RI/XI exception support is detected
by setting the 27th bit (IEC) of the PageGrain C0 register
and reading back the value of that register to verify the
bit is enabled.

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7340/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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Leonid Yegoshin 2014-07-15 14:09:57 +01:00 • committed by Ralf Baechle

parent 5890f70f15

commit 6575b1d417

2 changed files with 10 additions and 0 deletions

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arch/mips/include/asm/mipsregs.h

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9

arch/mips/kernel/cpu-probe.c

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