diff options
| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2014-07-15 13:09:57 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-08-01 22:06:40 (GMT) |
| commit | 6575b1d4173eaeff6742a2c6dcbd835bb052952b (patch) | |
| tree | 786eada52d0db5a02411bb1aae5a138d4aacc782 /arch/mips/include | |
| parent | 5890f70f15c52d0204a578422f8da828a0ba1096 (diff) | |
| download | linux-6575b1d4173eaeff6742a2c6dcbd835bb052952b.tar.xz | |
MIPS: kernel: cpu-probe: Detect unique RI/XI exceptions
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>
Diffstat (limited to 'arch/mips/include')
| -rw-r--r-- | arch/mips/include/asm/mipsregs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h index 4171255..9775c1a 100644 --- a/arch/mips/include/asm/mipsregs.h +++ b/arch/mips/include/asm/mipsregs.h @@ -265,6 +265,7 @@ #define PG_XIE (_ULCAST_(1) << 30) #define PG_ELPA (_ULCAST_(1) << 29) #define PG_ESP (_ULCAST_(1) << 28) +#define PG_IEC (_ULCAST_(1) << 27) /* * R4x00 interrupt enable / cause bits |