kexec: Avoid overwriting the current pgd (V2)
This patch updates the kexec code for i386 and x86_64 to avoid overwriting
the current pgd. For most people is overwriting the current pgd is not a big
problem. When kexec:ing into a new kernel that reinitializes and makes use of
all memory we don't care about saving state.
But overwriting the current pgd is not a good solution in the case of kdump
(CONFIG_CRASH_DUMP) where we want to preserve as much state as possible when
a crash occurs. This patch solves the overwriting issue.
20060524: V2
- Broke out architecture-specific data structures into asm/kexec.h
- Fixed a i386/PAE page table problem only triggering on real hardware.
- Moved segment handling code into the assembly routines.
20060501: V1
- First release
Signed-off-by: Magnus Damm <[email protected]>
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