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| author | Mark Rutland <mark.rutland@arm.com> | 2012-11-14 11:32:24 +0100 |
|---|---|---|
| committer | Mark Rutland <mark.rutland@arm.com> | 2013-01-31 16:51:39 +0100 |
| commit | b2deabe3ba664a1ec47400c0ca285e951874e0cc (patch) | |
| tree | f23f2dfe4abb6d10a40801edbaf227d21cb31471 /include/clocksource/arm_arch_timer.h | |
| parent | arm: arch_timer: divorce from local_timer api (diff) | |
| download | linux-b2deabe3ba664a1ec47400c0ca285e951874e0cc.tar.xz linux-b2deabe3ba664a1ec47400c0ca285e951874e0cc.zip | |
arm: arch_timer: add arch_counter_set_user_access
Several bits in CNTKCTL reset to 0, including PL0VTEN. For architectures
using the generic timer which wish to have a fast gettimeofday vDSO
implementation, these bits must be set to 1 by the kernel. For
architectures without a vDSO, it's best to leave the bits set to 0 for
now to ensure that if and when support is added, it's implemented sanely
architecture wide.
As the bootloader might set PL0VTEN to a value that doesn't correspond
to that which the kernel prefers, we must explicitly set it to the
architecture port's preferred value.
This patch adds arch_counter_set_user_access, which sets the PL0 access
permissions to that required by the architecture. For arch/arm, this
currently means disabling all userspace access.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'include/clocksource/arm_arch_timer.h')
0 files changed, 0 insertions, 0 deletions