linux/arch/ia64
Magnus Damm cee87af2a5 [IA64] kexec: Use EFI_LOADER_DATA for ELF core header
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.html

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Cc: Simon Horman <horms@verge.net.au>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
2007-03-06 14:50:33 -08:00
..
configs [IA64] update sn2_defconfig 2006-10-17 14:55:45 -07:00
dig [PATCH] tty: Remove include of screen_info.h from tty.h 2006-07-10 13:24:16 -07:00
hp [PATCH] mark struct file_operations const 2 2007-02-12 09:48:44 -08:00
ia32 [IA64] sync compat getdents 2007-03-06 14:49:24 -08:00
kernel [IA64] kexec: Use EFI_LOADER_DATA for ELF core header 2007-03-06 14:50:33 -08:00
lib [IA64] always build arch/ia64/lib/xor.o 2007-03-06 14:48:52 -08:00
mm [IA64] point saved_max_pfn to the max_pfn of the entire system 2007-03-06 14:47:54 -08:00
oprofile Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
pci [IA64] replace kmalloc+memset with kzalloc 2006-12-07 13:46:43 -08:00
scripts
sn [PATCH] irq: Remove set_native_irq_info 2007-02-26 10:34:07 -08:00
defconfig [PATCH] sgiioc4: Always share IRQ 2006-07-31 13:28:40 -07:00
install.sh
Kconfig ATA convert GSI to irq on ia64 2007-02-15 18:04:53 -05:00
Kconfig.debug [PATCH] Move Kprobes and Oprofile to "Instrumentation Support" menu 2005-11-07 07:53:35 -08:00
Makefile [IA64] add vmlinuz target 2006-06-21 14:31:07 -07:00
module.lds