I create wrong asm code but none test shows that this part of code is wrong.
I am not convinces that were good idea to create asm optimized macros
for caches. The reason is that there is not optimization with previous code
that's why make sense to add old code and do some benchmarking which
functions are faster.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

We found that on write-trough kernel is necessary to do that invalidation.
One WB is possible to use invalidation too.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Interrupts must be disabled while an interrupt state restore
(prep for interrupt return) is in progress.
Code to do this was lost in the port to the mainline kernel.
Signed-off-by: NSteven J. Magnani <steve@digidescorp.com>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

we are follow powerpc change:
44ef3390Signed-off-by: NMichal Simek <monstr@monstr.eu>

We had wrong name in unistd.h + I wire up this syscall
in syscall table.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NPeter Zijlstra <peterz@infradead.org>
Acked-by: NIngo Molnar <mingo@elte.hu>

Generic rt_sigsuspend syscalls doesn't need any asm wrapper.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

The noMMU syscall trap has a bug that causes R11 to be zero on return to
userland. Remove the extra "save" of R11 responsible for the bug.

Remove reloading of mode indicator because r11 already contains it.
Signed-off-by: NSteven J. Magnani <steve@digidescorp.com>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Microblaze version 7.20.d is the first MB version which can be run
on MMU linux. Please do not used previous version because they contain
HW bug.
Based on WB support was necessary to redesign whole cache design.
Microblaze versions from 7.20.a don't need to disable IRQ and cache
before working with them that's why there are special structures for it.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Microblaze v7.30.a will have 0x10 version string.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

We need to continue with next microblaze PVR version that's why
I have to remove that ancient version. These version strings not match
any versions. From Microblaze v5.00.a is possible to use this style.
I believe that none use ancients versions. If yes they will be just
labeled as unknown version.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

panic_timeout is in BSS section and it is cleared with BSS section.
This means that value is setup to 0.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

There is not necessary to count system calls that's why
I added DEBUG macro
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Level interrupts need to be ack'd in the unmask handler, as in powerpc.
Among other issues, this bug causes the system clock to appear to run at
double-speed.
Signed-off-by: NSteven J. Magnani <steve@digidescorp.com>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Futimesat was disabled. LTP testing shows that MB has no
problem with this syscall.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

WB cache has special flag in PVR. There is added checking mechanism
for PVR and DTS.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

The device tree handling for the gpio in the heart beat was not handling
the system when there was no gpio and it wasn't working with a newer version
of the gpio core which does not have the is-bidir property.
Signed-off-by: NJohn Linn <john.linn@xilinx.com>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Signed-off-by: NMichal Simek <monstr@monstr.eu>

After the signal frame is set up on the userspace stack, ptrace() should
be given an opportunity to single-step into the signal handler

FRV, Blackfin, mn10300 and UM. Worth to look at that patches.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

There is missing checking agains PVR but this is not important
for now. There are some missing checking too.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

We used cache_line as cache_line_lenght. For this reason
we did cache flushing 4 times longer than was necessary.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Signed-off-by: NMichal Simek <monstr@monstr.eu>

Till this patch reset always perform writen to 1.
Now we can use negative logic and perform reset write to 0.

It is opposite level than is currently read from that pin
Signed-off-by: NMichal Simek <monstr@monstr.eu>

I had to change message for gpio-reset because I always
not to see it. Prefix RESET is big and visible.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Saving is done in SAVE_STATE macros that's why another save discard
previous saved value.

This change has no effect to normal programs because they ends in any exception
and they are killed. On the other side has effect on debugging.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

This patch add support for dynamic function graph tracer.

There is one my expactation that I can do flush_icache after
all code modification. On microblaze is this safer than do
flush for every entry. For icache is used name flush but
correct should be invalidation - this will be fix in upcomming
new cache implementaion and WB support.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

For more information look at Documentation/trace folder.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

With dynamic function tracer, by default, _mcount is defined as an
"empty" function, it returns directly without any more action. When
enabling it in user-space, it will jump to a real tracing
function(ftrace_caller), and do the real job for us.

Differ from the static function tracer, dynamic function tracer provides
two functions ftrace_make_call()/ftrace_make_nop() to enable/disable the
tracing of some indicated kernel functions(set_ftrace_filter).

In the kernel version, there is only one "_mcount" string for every
kernel function, so, we just need to match this one in mcount_regex of
scripts/recordmcount.pl.

For more information please look at code and Documentation/trace folder.

Steven ACK that scripts/recordmcount.pl part.
Acked-by: NSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Implement MCOUNT_TEST in asm code - it is faster than use
generic code
Signed-off-by: NMichal Simek <monstr@monstr.eu>

If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to
_mcount will be inserted into each kernel function. so, there is a
possibility to trace the kernel functions in _mcount.

This patch add the specific _mcount support for static function
tracing. by default, ftrace_trace_function is initialized as
ftrace_stub(an empty function), so, the default _mcount will introduce
very little overhead. after enabling ftrace in user-space, it will jump
to a real tracing function and do static function tracing for us.

Commit message from Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: NMichal Simek <monstr@monstr.eu>

There are just two major changes
Renamed local_irq functions to raw_local_irq in irq.c.
Added TRACE_IRQFLAGS_SUPPORT to Kconfig.debug.

Look at Documentation/irqflags-tracing.txt
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Microblaze needs to do lock_init very soon because MMU init calls lock functions.

Here is the explanation from Peter Zijlstra why we have to enable
__ARCH_WANTS_INTERRUPTS_ON_CTSW.

"So we schedule while holding rq->lock (for obvious reasons), but since
lockdep tracks held locks per tasks, we need to transfer the held state
from the prev to the next task. We do this by explicity calling
spin_release(&rq->lock) in context_switch() right before switch_to(),
and calling spin_acquire(&rq->lock) in
finish_task_switch()->finish_lock_switch().

Now, for some reason lockdep thinks that interrupts got enabled over the
context switch (git grep __ARCH_WANTS_INTERRUPTS_ON_CTSW arch/microblaze
doesn't seem to turn up anything).

Clearly trying to acquire the rq->lock with interrupts enabled is a bad
idea and lockdep warns you about this."
Signed-off-by: NMichal Simek <monstr@monstr.eu>

It is the same counter as we use as free running one.
I would like to use it for ftrace.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

This is working implemetation but the problem is that
Microblaze misses frame pointer that's why is there
big loop which trace and show all addresses which are in text.
It shows addresses which are in registers, etc.

This is problem and this is the reason why all Microblaze
traces are wrong. There is an option to do hacks and trace
the kernel code but this is too complicated.
Signed-off-by: NMichal Simek <monstr@monstr.eu>

It is important for ftrace irqsoff support
Signed-off-by: NMichal Simek <monstr@monstr.eu>

The problem was that free_initmem pass to  free_initrd_mem got
bad aligned __init_begin symbol and free_initrd_mem don't care
about __init_end but take PAGE_SIZE instead.

Here is behavior in kernel bootlog.
ramdisk_execute_command from (init/main.c) was rewrite

Freeing unused kernel memory: 6224k freed
Failed to execute ��������������{���
Failed to execute ��������������{����.  Attempting defaults...
Mounting proc:
Mounting var:
Signed-off-by: NMichal Simek <monstr@monstr.eu>

Signed-off-by: NMichal Simek <monstr@monstr.eu>

New helper - sys_mmap_pgoff(); switch syscalls to using it.
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Merge common code between Microblaze and PowerPC, and make it available
to Sparc
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NMichal Simek <monstr@monstr.eu>
Acked-by: NStephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: NStephen Rothwell <sfr@canb.auug.org.au>

Add a common header file for working with the flattened device tree
data structure and merge the shared data tags used by Microblaze and
PowerPC
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NWolfram Sang <w.sang@pengutronix.de>
Acked-by: NMichal Simek <monstr@monstr.eu>
Acked-by: NStephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: NStephen Rothwell <sfr@canb.auug.org.au>