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  1. 03 5月, 2013 1 次提交
    • K
      x86, gdt, hibernate: Store/load GDT for hibernate path. · cc456c4e
      由 Konrad Rzeszutek Wilk 提交于 
      The git commite7a5cd06
("x86-64, gdt: Store/load GDT for ACPI S3 or hibernate/resume path
is not needed.") assumes that for the hibernate path the booting
kernel and the resuming kernel MUST be the same. That is certainly
the case for a 32-bit kernel (see check_image_kernel and
CONFIG_ARCH_HIBERNATION_HEADER config option).

However for 64-bit kernels it is OK to have a different kernel
version (and size of the image) of the booting and resuming kernels.
Hence the above mentioned git commit introduces an regression.

This patch fixes it by introducing a 'struct desc_ptr gdt_desc'
back in the 'struct saved_context'. However instead of having in the
'save_processor_state' and 'restore_processor_state' the
store/load_gdt calls, we are only saving the GDT in the
save_processor_state.

For the restore path the lgdt operation is done in
hibernate_asm_[32|64].S in the 'restore_registers' path.

The apt reader of this description will recognize that only 64-bit
kernels need this treatment, not 32-bit. This patch adds the logic
in the 32-bit path to be more similar to 64-bit so that in the future
the unification process can take advantage of this.

[ hpa: this also reverts an inadvertent on-disk format change ]
Suggested-by: N"H. Peter Anvin" <hpa@zytor.com>
Acked-by: N"Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1367459610-9656-2-git-send-email-konrad.wilk@oracle.comSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
      cc456c4e
  3. 21 2月, 2012 2 次提交
  5. 18 11月, 2011 1 次提交
    • H
      x86: Generate system call tables and unistd_*.h from tables · 303395ac
      由 H. Peter Anvin 提交于 
      Generate system call tables and unistd_*.h automatically from the
tables in arch/x86/syscalls.  All other information, like NR_syscalls,
is auto-generated, some of which is in asm-offsets_*.c.

This allows us to keep all the system call information in one place,
and allows for kernel space and user space to see different
information; this is currently used for the ia32 system call numbers
when building the 64-bit kernel, but will be used by the x32 ABI in
the near future.

This also removes some gratuitious differences between i386, x86-64
and ia32; in particular, now all system call tables are generated with
the same mechanism.

Cc: H. J. Lu <hjl.tools@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
      303395ac
  7. 10 2月, 2011 1 次提交
  9. 27 8月, 2009 1 次提交
    • J
      tracing: Define NR_syscalls for x86_64 · a5a2f8e2
      由 Jason Baron 提交于 
      Express the available number of syscalls in a standard way by defining
NR_syscalls.

The common way to define it is to place its definition in asm/unistd.h
However, the number of syscalls is defined using __NR_syscall_max in
x86-64 after building a dynamic header file "asm-offsets.h"

The source file that generates this header, asm-offsets-64.c includes
unistd.h, then if we want to express NR_syscalls from __NR_syscall_max
in unistd.h only after generating the dynamic header file, we need a
watchguard.

If unistd.h is included from asm-offsets-64.c, then we are generating
asm-offset.h which defines __NR_syscall_max. At this time, we don't
want to (we can't) define NR_syscalls, then we do nothing.
Otherwise we define NR_syscalls because we know asm-offsets.h has
been generated.
Signed-off-by: NJason Baron <jbaron@redhat.com>
Acked-by: NSteven Rostedt <rostedt@goodmis.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Jiaying Zhang <jiayingz@google.com>
Cc: Martin Bligh <mbligh@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Josh Stone <jistone@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anwin <hpa@zytor.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
LKML-Reference: <20090826160910.GB2658@redhat.com>
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
      a5a2f8e2
  11. 12 5月, 2009 1 次提交
    • H
      x86, boot: make kernel_alignment adjustable; new bzImage fields · 37ba7ab5
      由 H. Peter Anvin 提交于 
      Make the kernel_alignment field adjustable; this allows us to set it
to a large value (intended to be 16 MB to avoid ZONE_DMA contention,
memory holes and other weirdness) while a smart bootloader can still
force a loading at a lesser alignment if absolutely necessary.

Also export pref_address (preferred loading address, corresponding to
the link-time address) and init_size, the total amount of linear
memory the kernel will require during initialization.

[ Impact: allows better kernel placement, gives bootloader more info ]
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      37ba7ab5
  13. 01 4月, 2009 1 次提交
  15. 20 1月, 2009 2 次提交
  17. 18 1月, 2009 6 次提交
  19. 16 1月, 2009 2 次提交
    • T
      x86: merge 64 and 32 SMP percpu handling · 9939ddaf
      由 Tejun Heo 提交于 
      Now that pda is allocated as part of percpu, percpu doesn't need to be
accessed through pda.  Unify x86_64 SMP percpu access with x86_32 SMP
one.  Other than the segment register, operand size and the base of
percpu symbols, they behave identical now.

This patch replaces now unnecessary pda->data_offset with a dummy
field which is necessary to keep stack_canary at its place.  This
patch also moves per_cpu_offset initialization out of init_gdt() into
setup_per_cpu_areas().  Note that this change also necessitates
explicit per_cpu_offset initializations in voyager_smp.c.

With this change, x86_OP_percpu()'s are as efficient on x86_64 as on
x86_32 and also x86_64 can use assembly PER_CPU macros.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      9939ddaf
    • T
      x86: fold pda into percpu area on SMP · 1a51e3a0
      由 Tejun Heo 提交于 
      [ Based on original patch from Christoph Lameter and Mike Travis. ]

Currently pdas and percpu areas are allocated separately.  %gs points
to local pda and percpu area can be reached using pda->data_offset.
This patch folds pda into percpu area.

Due to strange gcc requirement, pda needs to be at the beginning of
the percpu area so that pda->stack_canary is at %gs:40.  To achieve
this, a new percpu output section macro - PERCPU_VADDR_PREALLOC() - is
added and used to reserve pda sized chunk at the start of the percpu
area.

After this change, for boot cpu, %gs first points to pda in the
data.init area and later during setup_per_cpu_areas() gets updated to
point to the actual pda.  This means that setup_per_cpu_areas() need
to reload %gs for CPU0 while clearing pda area for other cpus as cpu0
already has modified it when control reaches setup_per_cpu_areas().

This patch also removes now unnecessary get_local_pda() and its call
sites.

A lot of this patch is taken from Mike Travis' "x86_64: Fold pda into
per cpu area" patch.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      1a51e3a0
  21. 19 12月, 2008 1 次提交
  23. 23 10月, 2008 1 次提交
  25. 23 7月, 2008 1 次提交
  27. 16 7月, 2008 2 次提交
  29. 09 7月, 2008 1 次提交
  31. 08 7月, 2008 4 次提交
  33. 29 4月, 2008 1 次提交
  35. 30 1月, 2008 6 次提交
  37. 28 10月, 2007 1 次提交
  39. 24 10月, 2007 1 次提交
  41. 11 10月, 2007 2 次提交
  43. 03 5月, 2007 1 次提交