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path: root/include/asm-arm/kexec.h
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2008-05-30There is no need to have BOOT_PARAMS_SIZE known outside of atags.cUwe Kleine-König
atags.c was the only user of KEXEC_BOOT_PARAMS_SIZE and kexec.h was only included to get that definition. Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> Acked-by: Uli Luckas <u.luckas@road.de>
2008-02-29[ARM] 4838/1: Fix kexec for SA1100 machinesThomas Kunze
This patch sets KEXEC_CONTROL_MEMORY_LIMIT to (-1)UL. As the value is compared with physical addresses TASK_SIZE makes no sense. Machines where the RAM addresses start above TASK_SIZE kexecs eats all memory and crashes the kernel without this patch. Signed-off-by: Thomas Kunze <thommycheck@gmx.de> Acked-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2008-02-04[ARM] 4736/1: Export atags to userspace and allow kexec to use customised atagsRichard Purdie
Currently, the atags used by kexec are fixed to the ones originally used to boot the kernel. This is less than ideal as changing the commandline, initrd and other options would be a useful feature. This patch exports the atags used for the current kernel to userspace through an "atags" file in procfs. The presence of the file is controlled by its own Kconfig option and cleans up several ifdef blocks into a separate file. The tags for the new kernel are assumed to be at a fixed location before the kernel image itself. The location of the tags used to boot the original kernel is unimportant and no longer saved. Based on a patch from Uli Luckas <u.luckas@road.de> Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Acked-by: Uli Luckas <u.luckas@road.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-10-12[ARM] 4599/1: Preserve ATAG list for use with kexec (2.6.23)Mike Westerhof
This patch resolves a kexec boot failure that can occur because no ATAGs are passed in to the kexec'd kernel. Currently the newly-kexec'd kernel may fail if it requires specific ATAGs, or it may fail because the fixed memory location at which it expects to find the ATAGs may contain random data instead of ATAGs. The patch ensures that any ATAGs passed to the current kernel at boot time are copied to a static buffer, and are copied back when kexec copies the new kernel into place. Thus the new kernel sees the same ATAGs from kexec and the boot loader. The boot parameters are copied without regard to type, content, or length -- this patch's scope is limited soley to saving and restoring a fixed-size block of memory containing the kernel's boot parameters. Additional functionality to examine, alter, or replace the ATAGs (using kexec, for example) can be implemented by manipulating the static buffer containing the preserved ATAGs. Note: the size of the buffer (1.5KB) is selected to comfortably hold one of each ATAG type, including a maximum-length command line and the maximum number of ATAG_MEM structures currently supported by the kernel. Should an ATAG list exceed that limit, the list will be silently truncated to that limit (to do other- wise at that point in the boot process would make a simple problem exceedingly complicated). [Note: this is the same patch as 4579, modified to accomodate the ATAG changes introduced in 2.6.23] Signed-off-by: Mike Westerhof <mwester at dls.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-05-08kdump/kexec: calculate note size at compile timeSimon Horman
Currently the size of the per-cpu region reserved to save crash notes is set by the per-architecture value MAX_NOTE_BYTES. Which in turn is currently set to 1024 on all supported architectures. While testing ia64 I recently discovered that this value is in fact too small. The particular setup I was using actually needs 1172 bytes. This lead to very tedious failure mode where the tail of one elf note would overwrite the head of another if they ended up being alocated sequentially by kmalloc, which was often the case. It seems to me that a far better approach is to caclculate the size that the area needs to be. This patch does just that. If a simpler stop-gap patch for ia64 to be squeezed into 2.6.21(.X) is needed then this should be as easy as making MAX_NOTE_BYTES larger in arch/asm-ia64/kexec.h. Perhaps 2048 would be a good choice. However, I think that the approach in this patch is a much more robust idea. Acked-by: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-16[ARM] 4137/1: Add kexec supportRichard Purdie
Add kexec support to ARM. Improvements like commandline handling could be made but this patch gives basic functional support. It uses the next available syscall number, 347. Once the syscall number is known, userspace support will be finalised/submitted to kexec-tools, various patches already exist. Originally based on a patch by Maxim Syrchin but updated and forward ported by various people. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>