• Milton Miller's avatar
    powerpc: Kexec exit should not use magic numbers · 1767c8f3
    Milton Miller authored
    Commit 54622f10 ("powerpc: Support for
    relocatable kdump kernel") added a magic flag value in a register to
    tell purgatory that it should be a panic kernel.  This part is wrong
    and is reverted by this commit.
    
    The kernel gets a list of memory blocks and a entry point from user space.
    Its job is to copy the blocks into place and then branch to the designated
    entry point (after turning "off" the mmu).
    
    The user space tool inserts a trampoline, called purgatory, that runs
    before the user supplied code.   Its job is to establish the entry
    environment for the new kernel or other application based on the contents
    of memory.  The purgatory code is compiled and embedded in the tool,
    where it is later patched using the elf symbol table using elf symbols.
    
    Since the tool knows it is creating a purgatory that will run after a
    kernel crash, it should just patch purgatory (or the kernel directly)
    if something needs to happen.
    Signed-off-by: default avatarMilton Miller <miltonm@bga.com>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    1767c8f3
misc_64.S 15.2 KB