diff options
| author | Alistair Popple <alistair@popple.id.au> | 2020-05-06 13:40:41 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-19 00:10:38 +1000 |
| commit | 2aa6195e43b3740258ead93aee42ac719dd4c4b0 (patch) | |
| tree | 07ee5ab059b1b8f47ce98a1bbde1b801ea8f671b /arch/powerpc/kernel/traps.c | |
| parent | 0b582db5490a1f250ef63337dd46d5c7599dae80 (diff) | |
powerpc: Enable Prefixed Instructions
Prefix instructions have their own FSCR bit which needs to enabled via
a CPU feature. The kernel will save the FSCR for problem state but it
needs to be enabled initially.
If prefixed instructions are made unavailable by the [H]FSCR, attempting
to use them will cause a facility unavailable exception. Add "PREFIX" to
the facility_strings[].
Currently there are no prefixed instructions that are actually emulated
by emulate_instruction() within facility_unavailable_exception().
However, when caused by a prefixed instructions the SRR1 PREFIXED bit is
set. Prepare for dealing with emulated prefixed instructions by checking
for this bit.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Link: https://lore.kernel.org/r/20200506034050.24806-22-jniethe5@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/traps.c')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 477befcda8d3..e37bf7945d27 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1737,6 +1737,7 @@ void facility_unavailable_exception(struct pt_regs *regs) [FSCR_TAR_LG] = "TAR", [FSCR_MSGP_LG] = "MSGP", [FSCR_SCV_LG] = "SCV", + [FSCR_PREFIX_LG] = "PREFIX", }; char *facility = "unknown"; u64 value; |