linux-toradex.git/arch/arm/lib, branch v3.6

ARM: 7529/1: delay: set loops_per_jiffy when moving to timer-based loop

2012-09-09T16:28:48+00:00

The delay functions may be called by some platforms between switching to
the timer-based delay loop but before calibration. In this case, the
initial loops_per_jiffy may not be suitable for the timer (although a
compromise may be achievable) and delay times may be considered too
inaccurate.

This patch updates loops_per_jiffy when switching to the timer-based
delay loop so that delays are consistent prior to calibration.

Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS

2012-09-09T16:28:47+00:00

The {get,put}_user macros don't perform range checking on the provided
__user address when !CPU_HAS_DOMAINS.

This patch reworks the out-of-line assembly accessors to check the user
address against a specified limit, returning -EFAULT if is is out of
range.

[will: changed get_user register allocation to match put_user]
[rmk: fixed building on older ARM architectures]

Reported-by: Catalin Marinas 
Signed-off-by: Will Deacon 
Cc: stable@vger.kernel.org
Signed-off-by: Russell King

ARM: Bring back ARMv3 IO and user access code

2012-08-13T10:44:13+00:00

This partially reverts 357c9c1f07d4546bc3fbc0fd1044d96b114d14ed
(ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs).

Although we only support StrongARM on the RiscPC, we need to keep the
ARMv3 user access code for this platform because the bus does not
understand half-word load/stores.

Reported-by: Arnd Bergmann 
Signed-off-by: Russell King

arch: remove direct definitions of KERN_ uses

2012-07-31T00:25:13+00:00

Add #include  so that the #define KERN_ macros
don't have to be duplicated.

Signed-off-by: Joe Perches 
Cc: Kay Sievers 
Cc: Russell King 
Cc: Kay Sievers 
Acked-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branches 'audit', 'delay', 'fixes', 'misc' and 'sta2x11' into for-linus

2012-07-27T22:06:32+00:00

ARM: 7452/1: delay: allow timer-based delay implementation to be selected

2012-07-09T16:42:23+00:00

This patch allows a timer-based delay implementation to be selected by
switching the delay routines over to use get_cycles, which is
implemented in terms of read_current_timer. This further allows us to
skip the loop calibration and have a consistent delay function in the
face of core frequency scaling.

To avoid the pain of dealing with memory-mapped counters, this
implementation uses the co-processor interface to the architected timers
when they are available. The previous loop-based implementation is
kept around for CPUs without the architected timers and we retain both
the maximum delay (2ms) and the corresponding conversion factors for
determining the number of loops required for a given interval. Since the
indirection of the timer routines will only work when called from C,
the sa1100 sleep routines are modified to branch to the loop-based delay
functions directly.

Tested-by: Shinya Kuribayashi 
Reviewed-by: Stephen Boyd 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 7449/1: use generic strnlen_user and strncpy_from_user functions

2012-07-09T16:41:11+00:00

This patch implements the word-at-a-time interface for ARM using the
same algorithm as x86. We use the fls macro from ARMv5 onwards, where
we have a clz instruction available which saves us a mov instruction
when targetting Thumb-2. For older CPUs, we use the magic 0x0ff0001
constant. Big-endian configurations make use of the implementation from
asm-generic.

With this implemented, we can replace our byte-at-a-time strnlen_user
and strncpy_from_user functions with the optimised generic versions.

Reviewed-by: Nicolas Pitre 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: Remove support for ARMv3 ARM610 and ARM710 CPUs

2012-05-05T04:50:50+00:00

This patch removes support for ARMv3 CPUs, which haven't worked properly
for quite some time (see the FIXME comment in arch/arm/mm/fault.c).  The
only V3 parts left is the cache model for ARMv3, which is needed for some
odd reason by ARM740T CPUs, and being able to build with -march=armv3,
which is required for the RiscPC platform due to its bus structure.

Acked-by: Will Deacon 
Acked-by: Jean-Christophe PLAGNIOL-VILLARD 
Signed-off-by: Russell King

ARM: 7301/1: Rename the T() macro to TUSER() to avoid namespace conflicts

2012-01-25T11:07:40+00:00

This macro is used to generate unprivileged accesses (LDRT/STRT) to user
space.

Signed-off-by: Catalin Marinas 
Acked-by: Nicolas Pitre 
Signed-off-by: Russell King

ARM: lib: add call_with_stack function for safely changing stack

2011-12-12T16:07:35+00:00

When disabling the MMU, it is necessary to take out a 1:1 identity map
of the reset code so that it can safely be executed with and without
the MMU active. To avoid the situation where the physical address of the
reset code aliases with the virtual address of the active stack (which
cannot be included in the 1:1 mapping), it is desirable to change to a
new stack at a location which is less likely to alias.

This code adds a new lib function, call_with_stack:

	void call_with_stack(void (*fn)(void *), void *arg, void *sp);

which changes the stack to point at the sp parameter, before invoking
fn(arg) with the new stack selected.

Reviewed-by: Nicolas Pitre 
Reviewed-by: Catalin Marinas 
Signed-off-by: Dave Martin 
Signed-off-by: Will Deacon