linux.git/arch/xtensa/kernel/entry.S, branch v3.10

xtensa: disable IRQs while IRQ handler is running

2013-05-09T08:07:11+00:00

IRQ handlers are expected to run with IRQs disabled.
See e.g. http://lwn.net/Articles/380931/ for a longer story.

This was overlooked in the commit
  2d1c645 xtensa: dispatch medium-priority interrupts
Revert to old behavior and simplify interrupt entry and exit code.
Interrupt handler still honours IRQ priority.

do_notify_resume/schedule must be called with interrupts enabled, enable
interrupts if we return from user exception.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add irq flags trace support

2013-05-09T08:07:11+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: add support for TLS

2013-02-24T03:35:57+00:00

The Xtensa architecture provides a global register called THREADPTR
for the purpose of Thread Local Storage (TLS) support. This allows us
to use a fairly simple implementation, keeping the thread pointer in
the regset and simply saving and restoring it upon entering/exiting
the from user space.

Signed-off-by: Chris Zankel

xtensa: add support for oprofile

2013-02-24T03:22:54+00:00

Support call graph profiling.
Keep upper two bits of PC unchanged through backtrace rather than take
them from sp (a1). The stack pointer is usually in the same GB (same
upper 2 bits) as PC, but technically doesn't always have to be (and
might not in the future, when taking full advantage of MMU v3).

Signed-off-by: Dan Nicolaescu 
Signed-off-by: Pete Delaney 
Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: dispatch medium-priority interrupts

2013-02-24T03:12:52+00:00

Add support for dispatching medium-priority interrupts, that is,
interrupts of priority levels 2 to EXCM_LEVEL. IRQ handling may be
preempted by higher priority IRQ.

Signed-off-by: Marc Gauthier 
Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: clean up files to make them code-style compliant

2012-12-19T05:10:25+00:00

Remove heading and trailing spaces, trim trailing lines, and wrap lines
that are longer than 80 characters.

Signed-off-by: Chris Zankel

xtensa: save and restore scompare1 SR on kernel entry

2012-12-19T05:10:22+00:00

Although scompare1 may be saved/restored by xchal_ncp_{load,store}
macros, explicit save/restore of registers manipulated by the kernel
itself is considered more correct.

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: provide proper assembler function boundaries with ENDPROC()

2012-12-19T05:10:20+00:00

Use ENDPROC() to mark the end of assembler functions.

Signed-off-by: Chris Zankel

xtensa: switch to generic kernel_execve()

2012-10-25T22:00:36+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel

xtensa: switch to generic kernel_thread()

2012-10-25T22:00:03+00:00

Signed-off-by: Max Filippov 
Signed-off-by: Chris Zankel