diff options
| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2014-07-15 15:09:57 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-08-02 00:06:40 +0200 |
| commit | 6575b1d4173eaeff6742a2c6dcbd835bb052952b (patch) | |
| tree | 786eada52d0db5a02411bb1aae5a138d4aacc782 /arch/mips/kernel/cpu-probe.c | |
| parent | MIPS: Use dedicated exception handler if CPU supports RI/XI exceptions (diff) | |
| download | linux-6575b1d4173eaeff6742a2c6dcbd835bb052952b.tar.xz linux-6575b1d4173eaeff6742a2c6dcbd835bb052952b.zip | |
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/kernel/cpu-probe.c')
| -rw-r--r-- | arch/mips/kernel/cpu-probe.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 0d30433db54b..cd252fd684b7 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -438,6 +438,15 @@ static void decode_configs(struct cpuinfo_mips *c) mips_probe_watch_registers(c); + if (cpu_has_rixi) { + /* Enable the RIXI exceptions */ + write_c0_pagegrain(read_c0_pagegrain() | PG_IEC); + back_to_back_c0_hazard(); + /* Verify the IEC bit is set */ + if (read_c0_pagegrain() & PG_IEC) + c->options |= MIPS_CPU_RIXIEX; + } + #ifndef CONFIG_MIPS_CPS if (cpu_has_mips_r2) { c->core = get_ebase_cpunum(); |