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  1. 09 Jul, 2008 30 commits
  3. 08 Jul, 2008 10 commits
    • Bernhard Walle's avatar
      x86: use FIRMWARE_MEMMAP on x86/E820 · 5dfcf14d
      Bernhard Walle authored 
      This patch uses the /sys/firmware/memmap interface provided in the last patch
on the x86 architecture when E820 is used. The patch copies the E820
memory map very early, and registers the E820 map afterwards via
firmware_map_add_early().
Signed-off-by: default avatarBernhard Walle <bwalle@suse.de>
Acked-by: default avatarGreg KH <gregkh@suse.de>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Cc: kexec@lists.infradead.org
Cc: yhlu.kernel@gmail.com
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      5dfcf14d
    • Bernhard Walle's avatar
      sysfs: add /sys/firmware/memmap · 69ac9cd6
      Bernhard Walle authored 
      This patch adds /sys/firmware/memmap interface that represents the BIOS
(or Firmware) provided memory map. The tree looks like:

    /sys/firmware/memmap/0/start   (hex number)
                           end     (hex number)
                           type    (string)
    ...                 /1/start
                           end
                           type

With the following shell snippet one can print the memory map in the same form
the kernel prints itself when booting on x86 (the E820 map).

  --------- 8< --------------------------
    #!/bin/sh
    cd /sys/firmware/memmap
    for dir in * ; do
        start=$(cat $dir/start)
        end=$(cat $dir/end)
        type=$(cat $dir/type)
        printf "%016x-%016x (%s)\n" $start $[ $end +1] "$type"
    done
  --------- >8 --------------------------

That patch only provides the needed interface:

 1. The sysfs interface.
 2. The structure and enumeration definition.
 3. The function firmware_map_add() and firmware_map_add_early()
    that should be called from architecture code (E820/EFI, for
    example) to add the contents to the interface.

If the kernel is compiled without CONFIG_FIRMWARE_MEMMAP, the interface does
nothing without cluttering the architecture-specific code with #ifdef's.

The purpose of the new interface is kexec: While /proc/iomem represents
the *used* memory map (e.g. modified via kernel parameters like 'memmap'
and 'mem'), the /sys/firmware/memmap tree represents the unmodified memory
map provided via the firmware. So kexec can:

 - use the original memory map for rebooting,
 - use the /proc/iomem for setting up the ELF core headers for kdump
   case that should only represent the memory of the system.

The patch has been tested on i386 and x86_64.
Signed-off-by: default avatarBernhard Walle <bwalle@suse.de>
Acked-by: default avatarGreg KH <gregkh@suse.de>
Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
Cc: kexec@lists.infradead.org
Cc: yhlu.kernel@gmail.com
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      69ac9cd6
    • Yinghai Lu's avatar
      x86: remove acpi_srat config v2 · 6247943d
      Yinghai Lu authored 
      use ACPI_NUMA directly

and move srat_32.c to mm/
Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      6247943d
    • Yinghai Lu's avatar
      x86: remove have_arch_parse_srat -v2 · 698839fe
      Yinghai Lu authored 
      we already have the same srat handling interface for 32bit.
Signed-off-by: default avatarYinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      698839fe
    • Ingo Molnar's avatar
      printk: export console_drivers · a29d1cfe
      Ingo Molnar authored 
      this symbol is needed by drivers/video/xen-fbfront.ko.

[ cherry-picked from tip/core/printk ]
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a29d1cfe
    • Jeremy Fitzhardinge's avatar
      x86/cpa: use an undefined PTE bit for testing CPA · 5a654ba7
      Jeremy Fitzhardinge authored 
      Rather than using _PAGE_GLOBAL - which not all CPUs support - to test
CPA, use one of the reserved-for-software-use PTE flags instead.  This
allows CPA testing to work on CPUs which don't support PGD.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      5a654ba7
    • Jeremy Fitzhardinge's avatar
      x86_32: remove __PAGE_KERNEL(_EXEC) · ef5e94af
      Jeremy Fitzhardinge authored 
      From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

Older x86-32 processors do not support global mappings (PGD), so must
only use it if the processor supports it.

The _PAGE_KERNEL* flags always have _PAGE_KERNEL set, since logically
we always want it set.

This is OK even on processors which do not support PGD, since all
_PAGE flags are masked with __supported_pte_mask before being turned
into a real in-pagetable pte.  On 32-bit systems, __supported_pte_mask
is initialized to not contain _PAGE_GLOBAL, and it is then added if
the CPU is found to support it.

The x86-32 code used to use __PAGE_KERNEL/__PAGE_KERNEL_EXEC for this
purpose, but they're now redundant and can be removed.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      ef5e94af
    • Jeremy Fitzhardinge's avatar
      x86: always set _PAGE_GLOBAL in _PAGE_KERNEL* flags · 8490638c
      Jeremy Fitzhardinge authored 
      Consistently set _PAGE_GLOBAL in _PAGE_KERNEL flags.  This makes 32-
and 64-bit code consistent, and removes some special cases where
__PAGE_KERNEL* did not have _PAGE_GLOBAL set, causing confusion as a
result of the inconsistencies.

This patch only affects x86-64, which generally always supports PGD.
The x86-32 patch is next.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      8490638c
    • Jeremy Fitzhardinge's avatar
      x86_64/setup: unconditionally populate the pgd · 574977a2
      Jeremy Fitzhardinge authored 
      When allocating a new pud, unconditionally populate the pgd (why did
we bother to create a new pud if we weren't going to populate it?).

This will only happen if the pgd slot was empty, since any existing
pud will be reused.
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      574977a2
    • Ingo Molnar's avatar
      x86: fix "x86: let setup_arch call init_apic_mappings for 32bit" · aea5f9f8
      Ingo Molnar authored 
      add back this line lost from trap_init():

        set_trap_gate(0,  &divide_error);
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      aea5f9f8
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