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phys_to_virt() calculates virtual address. As a important factor,
page_offset is excepted to be accurate.
Since arm64 kernel exposes va_bits through vmcore, using it.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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After kernel commit 7bc1a0f9e176 ("arm64: mm: use single quantity to
represent the PA to VA translation"), phys_offset can be negative if
running 52-bits kernel on 48-bits hardware.
So changing phys_offset from unsigned to signed.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Some code related to vmcore-dmesg.c is put into the util_lib, which
is not very reasonable, so lets move it back and tidy up those code.
In addition, that will also help to limit the size of vmcore-dmesg.txt
in vmcore-dmesg.c instead of elf_info.c.
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Here, no need to wrap the read_elf() again, lets invoke it directly.
So remove the read_elf_kcore() and clean up redundant code.
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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'vmcore-dmesg.c' already implements functionality to read
'vmcoreinfo' from vmcore file. The same can be used in other
features as well (one of which is reading the elf notes from
'kcore' file), so there is merit in moving this to the utility
libraries (util_lib).
Newer kernel versions (>= 4.19, with commit 23c85094fe1895caefdd
["proc/kcore: add vmcoreinfo note to /proc/kcore"], available),
have 'kcore' which now contains a new PT_NOTE which carries
the VMCOREINFO information.
If the same is available, we can benefit by using it in 'kexec-tools'.
This is especially useful for architectures like arm64 as we can
get kernel symbols like 'PHYS_OFFSET' from the '/proc/kcore' itself
and use it to calculate 'phys_offset' before we make a call to
'set_phys_offset()'.
For older kernels, we can try and determine the PHYS_OFFSET
value from PT_LOAD segments inside 'kcore' via some jugglery
of the correct virtual and physical address combinations.
Subsequent patch(es) in this series will use the same feature
to read the 'kcore' file.
This patch also makes some of the functions which were earlier
present in 'vmcore-dmesg.c' as non-static, so as to allow
future patches to use them as library functions.
Also we add the capability to read 'NUMBER(PHYS_OFFSET)' from
vmcoreinfo to the already present 'scan_vmcoreinfo()' code.
Future patches can look at reading more vmcoreinfo information
(for e.g. 'kaslr_offset()' for x86_64 and arm64) by using the
same framework.
Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Purgatory seems to partially duplicate system headers.
It seems a log cleaner not to do so.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Simon Horman <horms@verge.net.au>
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- Initial import into git
- initial nbi image formage support
- ppc32 initial register setting fixes.
- gzipped multiboot file support
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