While an earlier patch already did a small step into that direction,
this patch moves initialization of all memory end variables to as
early as possible, so that dependent code doesn't need to check
whether these variables have already been set.

Also, remove a misleading (perhaps just outdated) comment, and make
static a variable only used in a single file.
Signed-off-by: NJan Beulich <jbeulich@novell.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

CVS hasn't been used for a long time for them.
Signed-off-by: NAndi Kleen <ak@suse.de>

... instead of using a CONFIG option. The config option still controls
if the resulting executable actually has unwind information.

This is useful to prevent compilation errors when users select
CONFIG_STACK_UNWIND on old binutils and also allows to use
CFI in the future for non kernel debugging applications.

Cc: jbeulich@novell.com
Cc: sam@ravnborg.org
Signed-off-by: NAndi Kleen <ak@suse.de>

Makes code a little shorter.
Signed-off-by: NAndi Kleen <ak@suse.de>

Remove some unlinuxy ways to write function parameter definitions.
Remove some stray "return;"s

No functional change.

Cc: len.brown@intel.com
Signed-off-by: NAndi Kleen <ak@suse.de>

No functional changes.

Cc: len.brown@intel.com
Signed-off-by: NAndi Kleen <ak@suse.de>

They are not used in this file so remove them. i386 didn't have them either.

Cc: len.brown@intel.com
Signed-off-by: NAndi Kleen <ak@suse.de>

It used to contain support code for NUMAQ, but that is long gone already
on 64bit.
Signed-off-by: NAndi Kleen <ak@suse.de>

Since we only support PCI and ISA legacy busses now there is no need to
have an full array with checking.
Signed-off-by: NAndi Kleen <ak@suse.de>

They did not really belong into io_apic.c. Move them into a new file
and clean it up a bit.

Also remove outdated ATI quirk that was obsolete,
Signed-off-by: NAndi Kleen <ak@suse.de>

The MPS table specification says that the operating system should
renumber the IO-APICs following the table as needed.  However in
ACPI this is not allowed or neeeded and all x86-64 systems are ACPI
compliant.

The code was already disabled on some systems because it caused
problems there. Remove it completely now.

CC: mdomsch@dell.com
Signed-off-by: NAndi Kleen <ak@suse.de>

Bugzilla #6552 says:

"In arch/i386/boot/setup.S, movw is used instead of movb for PS/2 mouse
information, although it is unsigned char. This does not harm, because
the jmp instruction overwritten by movw is used before executing movw,
and never be used again"

I've no idea if this is a real bug or how it gets fixed, so I'm submitting
it for review instead of letting it die of boredom in bugzilla. Aditionally
to i386, I've changed x86-64, which mirrors the same code.

Credits to Yoshinori K. Okuji, who found the problem and suggested a fix.
Signed-off-by: NDiego Calleja <diegocg@gmail.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

The IO APIC code had lots of duplicated code to read/write 64bit
routing entries into the IO-APIC. Factor this out int common read/write
functions

In a few cases the IO APIC lock is taken more often now, but this
isn't a problem because it's all initialization/shutdown only
slow path code.

Similar to earlier x86-64 patch.

Includes a fix by Jiri Slaby for a mistake that broke resume
Signed-off-by: NAndi Kleen <ak@suse.de>

The IO APIC code had lots of duplicated code to read/write 64bit
routing entries into the IO-APIC. Factor this out int common read/write
functions

In a few cases the IO APIC lock is taken more often now, but this
isn't a problem because it's all initialization/shutdown only
slow path code.
Signed-off-by: NAndi Kleen <ak@suse.de>

It apparently has never triggered in many years.
Signed-off-by: NAndi Kleen <ak@suse.de>

PIC mode is an outdated way to drive the APICs that was used on
some early MP boards. It is not supported in the ACPI model.

It is unlikely to be ever configured by any x86-64 system

Remove it thus.
Signed-off-by: NAndi Kleen <ak@suse.de>

No 64bit EISA or Microchannel systems ever. Remove the left over code
in the IO-APIC driver and the mptable parser
Signed-off-by: NAndi Kleen <ak@suse.de>

This was an old workaround for broken MP-BIOS. The user could
specify overwrites on the command line.

I've never seen it being used for anything on 64bit. So get
rid of it for now.
Signed-off-by: NAndi Kleen <ak@suse.de>

And remove some old obsolete ones.
Signed-off-by: NAndi Kleen <ak@suse.de>

(based on x86-64 changes)
- Add a proper memory clobber to invlpg
- Remove an unused extern
Signed-off-by: NAndi Kleen <ak@suse.de>

- Convert CR* accesses to dedicated inline functions and rewrite
the rest as C inlines
- Don't do a double flush for global flushes (pointed out by Zach Amsden)
This was a bug workaround for old CPUs that don't do 64bit and is obsolete.
- Add a proper memory clobber to invlpg
- Remove an unused extern
Signed-off-by: NAndi Kleen <ak@suse.de>

The new systems already use focus disabled and the comment was
completely outdated.
Signed-off-by: NAndi Kleen <ak@suse.de>

Nobody has been setting the mismatch counter and the ifdef was never
set so remove it.
Signed-off-by: NAndi Kleen <ak@suse.de>

IO-APIC or local APIC can only be disabled at runtime anyways and
Kconfig has forced these options on for a long time now.

The Kconfigs are kept only now for the benefit of the shared acpi
boot.c code.
Signed-off-by: NAndi Kleen <ak@suse.de>

Signed-off-by: NAndi Kleen <ak@suse.de>

And move the comment to a proper place.
Signed-off-by: NAndi Kleen <ak@suse.de>

- Move them to a pure assembly file. Previously they were in
a C file that only consisted of inline assembly. Doing it in pure
assembler is much nicer.
- Add a frame.i include with FRAME/ENDFRAME macros to easily
add frame pointers to assembly functions
- Add dwarf2 annotation to them so that the new dwarf2 unwinder
doesn't get stuck on them
- Random cleanups

Includes feedback from Jan Beulich and a UML build fix from Andrew
Morton.

Cc: jbeulich@novell.com
Cc: jdike@addtoit.com
Signed-off-by: NAndi Kleen <ak@suse.de>

LOCK_PREFIX is replaced by nops on UP systems, so it has to be a special
macro.  Previously this was only possible from C. Allow it for pure
assembly files too. Similar to earlier x86-64 patch.
Signed-off-by: NAndi Kleen <ak@suse.de>

Previously it didn't align. Use the same one as the C compiler
in blended mode, which is good for K8 and Core2 and doesn't hurt
on P4.
Signed-off-by: NAndi Kleen <ak@suse.de>

rwlocks are now out of line, so it near never triggers.  Also it was
incompatible with the new dwarf2 unwinder because it had unannotiatable
push/pops.
Signed-off-by: NAndi Kleen <ak@suse.de>

- Move the slow path fallbacks to their own assembly files
This makes them much easier to read and is needed for the next change.
- Add CFI annotations for unwinding (XXX need review)
- Remove constant case which can never happen with out of line spinlocks
- Use patchable LOCK prefixes
- Don't use lock sections anymore for inline code because they can't
be expressed by the unwinder (this adds one taken jump to the lock
fast path)

Cc: jbeulich@novell.com
Signed-off-by: NAndi Kleen <ak@suse.de>

Signed-off-by: NAndi Kleen <ak@suse.de>

Signed-off-by: NAndi Kleen <ak@suse.de>

Use knowledge about EFLAGS layout (bits 22:63 are always 0) to distingush
EFLAGS word and kernel address in the spin lock stack frame.
Signed-off-by: NAndi Kleen <ak@suse.de>

This ports the algorithm from x86-64 (with improvements) to i386.
Previously this only worked for frame pointer enabled kernels.
But spinlocks have a very simple stack frame that can be manually
analyzed. Do this.
Signed-off-by: NAndi Kleen <ak@suse.de>

Based on patch from Frank van Maarseveen <frankvm@frankvm.com>, but
extended.
Signed-off-by: NAndi Kleen <ak@suse.de>

A few trivial spelling and grammar mistakes picked up in
"arch/x86_64/aperture.c", "arch/x86_64/crash.c" and
"arch/x86_64/apic.c". I think all are correct fixes but am ever aware
of my fallibility :o) This is my first patch submission so all
feedback is appreciated, esp. WRT CCing to Linus, Andi and
trivial@kernel.org, is this correct? And which is the most appropriate
kernel version to diff against? If any.

Should apply cleanly to 2.6.18-rc1
Signed-off-by: NAdam Henley <adamazing@gmail.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

-  adam

virtual addresses don't belong into kernel logs for non debugging

Cc: clemens@ladisch.de
Signed-off-by: NAndi Kleen <ak@suse.de>

Hello,

Following my discussion with Andi. Here is a patch that introduces
two new TIF flags to simplify the context switch code in __switch_to().
The idea is to minimize the number of cache lines accessed in the common
case, i.e., when neither the debug registers nor the I/O bitmap are used.

This patch covers the x86-64 modifications. A patch for i386 follows.

Changelog:
	- add TIF_DEBUG to track when debug registers are active
	- add TIF_IO_BITMAP to track when I/O bitmap is used
	- modify __switch_to() to use the new TIF flags

<signed-off-by>: eranian@hpl.hp.com
Signed-off-by: NAndi Kleen <ak@suse.de>

No need to include it from entry.S
Drop all the #ifdef __ASSEMBLY__
Signed-off-by: NAndi Kleen <ak@suse.de>