linux-toradex.git/arch/s390/kernel/head31.S, branch v3.0.64

[S390] correct address of _stext with CONFIG_SHARED_KERNEL=y

2010-05-12T07:32:26+00:00

As of git commit 1844c9bc0b2fed3023551c1affe033ab38e90b9a head64.S/head31.S
are not included in head.S anymore but build as an extra object. This breaks
shared kernel support because the .org statement in head64.S/head31.S for
CONFIG_SHARED_KERNEL=y will have a different effect. The end address of the
head.text section in head.o will be added to the .org value, to compensate
for this subtract 0x11000 to get the required value of 0x100000 again.

Signed-off-by: Martin Schwidefsky

[S390] add support for compressed kernels

2010-02-26T21:37:33+00:00

Add the "bzImage" compile target and the necessary code  to generate
compressed kernel images. The old style uncompressed "image" target
is preserved, a simple make will build them both.

Signed-off-by: Martin Schwidefsky

[S390] Initialize __LC_THREAD_INFO early.

2009-09-11T08:29:53+00:00

"lockdep: Fix backtraces" reveales a bug in early setup code: when
lockdep tries to save a stack backtrace before setup_arch has been
called the lowcore pointer for the current thread info pointer isn't
initialized yet.
However our save stack backtrace code relies on it. If the pointer
isn't initialized the saved backtrace will have zero entries.
lockdep however relies (correctly) on the fact that that cannot
happen.
A write access to some random memory region is the result.

Fix this by initializing the thread info pointer early.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] eliminate ipl_device from lowcore

2009-03-26T14:24:27+00:00

Signed-off-by: Martin Schwidefsky

[S390] Remove initial kernel stack backchain initialization.

2008-12-25T12:39:13+00:00

Early init code clears the backchain of the initial kernel stack frame.
This is not necessary since it is pre initialized with zeros. Plus it
was broken on 64 bit since it cleared only four of eight bytes.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] Add processor type march=z10 and a processor type safety check.

2008-12-25T12:39:12+00:00

This patch adds the code generation option for IBM System z10 and
adds a check in head[31,64].S to prevents the execution of a kernel
compiled for a new processor type on an old machine.

Signed-off-by: Martin Schwidefsky

[S390] Convert machine feature detection code to C.

2008-04-30T11:38:47+00:00

From: Heiko Carstens 
From: Carsten Otte 

This lets us use defines for the magic bits in machine flags instead
of using plain numbers all over the place.
In addition on newer machines features/facilities are indicated by the
result of the stfl instruction. So we use these bits instead of trying
to execute new instructions and check wether we get an exception or
not.
Also the mvpg instruction is always available when in zArch mode,
whereas the idte instruction is only available in zArch mode. This
results in some minor optimizations.

Signed-off-by: Heiko Carstens 
Signed-off-by: Carsten Otte 
Signed-off-by: Martin Schwidefsky

[S390] Fixed handling of access register mode faults.

2007-03-05T22:35:54+00:00

Replaced check_user_space() + __check_access_register with the new
check_space(). The old functions made wrong assumptions about kernel
and user space when the kernel and user address spaces are switched
(kernel in home space, user in primary/secondary space).
Secondly the user process can switch to the accress register mode if
it is running in primary or secondary mode. In addition it can load
an arbitrary value to the access registers. If any other value than
0 for primary space or 1 for secondary space is loaded and memory
is accessed using the base register related to the access register,
the program should be terminated with a SIGSEGV. To achieve that the
DUALD pointer in the DUCT and the PSALD pointer in the PASTE need
to point to an array of 8 invalid access-list entries to get a
ALEN-translation exception if an invalid alet is used.

Signed-off-by: Gerald Schaefer 
Signed-off-by: Martin Schwidefsky

[S390] nss: Free unused memory in kernel image.

2007-02-21T09:55:37+00:00

With CONFIG_SHARED_KERNEL the kernel text segment that might be in a
read only memory sections starts at 1MB. Memory between 0x12000 and
0x100000 is unused then. Free this, so we have appr. an extra MB
of memory available.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] Convert memory detection into C code.

2007-02-05T20:18:37+00:00

Hopefully this will make it more maintainable and less error prone.
Code makes use of search_exception_tables(). Since it calls this
function before the kernel exeception table is sorted, there is an
early call to sort_main_extable().

This way it's easy to use the already present infrastructure of fixup
sections. Also this would allows to easily convert the rest of
head[31|64].S into C code.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky