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    [IA64] kexec: Use EFI_LOADER_DATA for ELF core header · cee87af2
    Magnus Damm authored
    The address where the ELF core header is stored is passed to the secondary
    kernel as a kernel command line option.  The memory area for this header is
    also marked as a separate EFI memory descriptor on ia64.
    
    The separate EFI memory descriptor is at the moment of the type
    EFI_UNUSABLE_MEMORY.  With such a type the secondary kernel skips over the
    entire memory granule (config option, 16M or 64M) when detecting memory.
    If we are lucky we will just lose some memory, but if we happen to have
    data in the same granule (such as an initramfs image), then this data will
    never get mapped and the kernel bombs out when trying to access it.
    
    So this is an attempt to fix this by changing the EFI memory descriptor
    type into EFI_LOADER_DATA.  This type is the same type used for the kernel
    data and for initramfs.  In the secondary kernel we then handle the ELF
    core header data the same way as we handle the initramfs image.
    
    This patch contains the kernel changes to make this happen.  Pretty
    straightforward, we reserve the area in reserve_memory().  The address for
    the area comes from the kernel command line and the size comes from the
    specialized EFI parsing function vmcore_find_descriptor_size().
    
    The kexec-tools-testing code for this can be found here:
    http://lists.osdl.org/pipermail/fastboot/2007-February/005983.htmlSigned-off-by: default avatarMagnus Damm <magnus@valinux.co.jp>
    Cc: Simon Horman <horms@verge.net.au>
    Cc: Vivek Goyal <vgoyal@in.ibm.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
    cee87af2
setup.c 26.6 KB