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| author | John A. Williams <john.williams@petalogix.com> | 2011-05-24 10:57:11 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2011-07-25 09:13:42 +0200 |
| commit | 8904976e8ca45be3ec75acc71f5d855ef671a079 (patch) | |
| tree | 9c76c35266329312ace36ab009d686d5e2cd77f8 /arch/microblaze/kernel/cpu/cpuinfo.c | |
| parent | microblaze: trivial: Fix typo fault (diff) | |
| download | linux-8904976e8ca45be3ec75acc71f5d855ef671a079.tar.xz linux-8904976e8ca45be3ec75acc71f5d855ef671a079.zip | |
microblaze: Unprivileged stream instruction awareness
Add cpuinfo support for the new MicroBlaze option permitting userspace
(unprivileged) access to the streaming instructions (FSL / AXI-stream).
Emit a noisy warning at bootup if this is enabled, because bad user code
can potentially lockup the CPU.
Signed-off-by: John A. Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/cpu/cpuinfo.c')
| -rw-r--r-- | arch/microblaze/kernel/cpu/cpuinfo.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/cpu/cpuinfo.c b/arch/microblaze/kernel/cpu/cpuinfo.c index c1640c52711f..44394d80a683 100644 --- a/arch/microblaze/kernel/cpu/cpuinfo.c +++ b/arch/microblaze/kernel/cpu/cpuinfo.c @@ -88,4 +88,8 @@ void __init setup_cpuinfo(void) printk(KERN_WARNING "%s: Unsupported PVR setting\n", __func__); set_cpuinfo_static(&cpuinfo, cpu); } + + if (cpuinfo.mmu_privins) + printk(KERN_WARNING "%s: Stream instructions enabled" + " - USERSPACE CAN LOCK THIS KERNEL!\n", __func__); } |