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  1. 31 Oct, 2008 1 commit
    • Huang Ying's avatar
      kexec/i386: allocate page table pages dynamically · 92be3d6b
      Huang Ying authored
      Impact: save .text size when kexec is built in but not loaded
      
      This patch adds an architecture specific struct kimage_arch into
      struct kimage. The pointers to page table pages used by kexec are
      added to struct kimage_arch. The page tables pages are dynamically
      allocated in machine_kexec_prepare instead of statically from BSS
      segment. This will save up to 20k memory when kexec image is not
      loaded.
      Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      92be3d6b
  2. 23 Oct, 2008 2 commits
  3. 15 Aug, 2008 2 commits
  4. 26 Jul, 2008 1 commit
    • Huang Ying's avatar
      kexec jump · 3ab83521
      Huang Ying authored
      This patch provides an enhancement to kexec/kdump.  It implements the
      following features:
      
      - Backup/restore memory used by the original kernel before/after
        kexec.
      
      - Save/restore CPU state before/after kexec.
      
      The features of this patch can be used as a general method to call program in
      physical mode (paging turning off).  This can be used to call BIOS code under
      Linux.
      
      kexec-tools needs to be patched to support kexec jump. The patches and
      the precompiled kexec can be download from the following URL:
      
             source: http://khibernation.sourceforge.net/download/release_v10/kexec-tools/kexec-tools-src_git_kh10.tar.bz2
             patches: http://khibernation.sourceforge.net/download/release_v10/kexec-tools/kexec-tools-patches_git_kh10.tar.bz2
             binary: http://khibernation.sourceforge.net/download/release_v10/kexec-tools/kexec_git_kh10
      
      Usage example of calling some physical mode code and return:
      
      1. Compile and install patched kernel with following options selected:
      
      CONFIG_X86_32=y
      CONFIG_KEXEC=y
      CONFIG_PM=y
      CONFIG_KEXEC_JUMP=y
      
      2. Build patched kexec-tool or download the pre-built one.
      
      3. Build some physical mode executable named such as "phy_mode"
      
      4. Boot kernel compiled in step 1.
      
      5. Load physical mode executable with /sbin/kexec. The shell command
         line can be as follow:
      
         /sbin/kexec --load-preserve-context --args-none phy_mode
      
      6. Call physical mode executable with following shell command line:
      
         /sbin/kexec -e
      
      Implementation point:
      
      To support jumping without reserving memory.  One shadow backup page (source
      page) is allocated for each page used by kexeced code image (destination
      page).  When do kexec_load, the image of kexeced code is loaded into source
      pages, and before executing, the destination pages and the source pages are
      swapped, so the contents of destination pages are backupped.  Before jumping
      to the kexeced code image and after jumping back to the original kernel, the
      destination pages and the source pages are swapped too.
      
      C ABI (calling convention) is used as communication protocol between
      kernel and called code.
      
      A flag named KEXEC_PRESERVE_CONTEXT for sys_kexec_load is added to
      indicate that the loaded kernel image is used for jumping back.
      
      Now, only the i386 architecture is supported.
      Signed-off-by: default avatarHuang Ying <ying.huang@intel.com>
      Acked-by: default avatarVivek Goyal <vgoyal@redhat.com>
      Cc: "Eric W. Biederman" <ebiederm@xmission.com>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
      Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3ab83521
  5. 22 Jul, 2008 1 commit
    • Vegard Nossum's avatar
      x86: consolidate header guards · 77ef50a5
      Vegard Nossum authored
      This patch is the result of an automatic script that consolidates the
      format of all the headers in include/asm-x86/.
      
      The format:
      
      1. No leading underscore. Names with leading underscores are reserved.
      2. Pathname components are separated by two underscores. So we can
         distinguish between mm_types.h and mm/types.h.
      3. Everything except letters and numbers are turned into single
         underscores.
      Signed-off-by: default avatarVegard Nossum <vegard.nossum@gmail.com>
      77ef50a5
  6. 17 Apr, 2008 1 commit
  7. 30 Jan, 2008 1 commit
  8. 11 Oct, 2007 1 commit