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| author | Keir Fraser <keir.fraser@citrix.com> | 2008-02-01 11:16:37 +0000 |
|---|---|---|
| committer | Keir Fraser <keir.fraser@citrix.com> | 2008-02-01 11:16:37 +0000 |
| commit | 042397126c8e75019b4c74483d7bfdff7f501a0a (patch) | |
| tree | b5a27ec4a9c2f680b34cb155ff0eddc72a11c4dd /unmodified_drivers/linux-2.6/platform-pci/panic-handler.c | |
| parent | bd03fbb90e6bfcbed2f71a4ef815840f86e66136 (diff) | |
| download | xen-042397126c8e75019b4c74483d7bfdff7f501a0a.tar.gz xen-042397126c8e75019b4c74483d7bfdff7f501a0a.tar.bz2 xen-042397126c8e75019b4c74483d7bfdff7f501a0a.zip | |
Direct Linux boot: Support booting non-relocatable Linux kernels.
This patch introduces a hack to make non-relocatable kernels
bootable too. Non-relocatable kernels absolutely want to run
at 0x100000 and are not at all happy about being at 0x200000.
Fortunately, thanks to crazy programs like LOADLIN, Linux has
a couple of hooks in its boot process which can be used to
play games. The 'code32_switch' hook is executed immediately
following the switch to protected mode.
So, this patch installs a hook at 0x200000+kernel_size. The hook
is hand crafted assembly which sets up all the segments as needed,
then essentially does memmove(0x100000,0x200000,kernel_size) and
finally does an unconditional jmp to 0x100000.
Amazingly this actually really does work. It has been successfully
tested with RHEL-2.1 and Fedora Core 6 install kernels on i386, and
Fedora Core 6 and 7 kernels on x86_64.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'unmodified_drivers/linux-2.6/platform-pci/panic-handler.c')
0 files changed, 0 insertions, 0 deletions