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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2019-07-15 15:30:33 +0200 |
|---|---|---|
| committer |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-07-23 10:43:50 +0200 |
| commit | 6abe28197024f732f1e298b1a593505282505857 (patch) | |
| tree | 51afb04f173a15ee3bb2f26b4ac1d8e268914da1 /arch/s390/boot/Makefile | |
| parent | Linus 5.3-rc1 (diff) | |
| download | linux-dev-6abe28197024f732f1e298b1a593505282505857.tar.xz linux-dev-6abe28197024f732f1e298b1a593505282505857.zip | |
s390: enable detection of kernel version from bzImage
Extend "parmarea" to include an offset of the version string, which is
stored as 8-byte big endian value.
To retrieve version string from bzImage reliably, one should check the
presence of "S390EP" ascii string at 0x10008 (available since v3.2),
then read the version string offset from 0x10428 (which has been 0
since v3.2 up to now). The string is null terminated.
Could be retrieved with the following "file" command magic (requires
file v5.34):
8 string \x02\x00\x00\x18\x60\x00\x00\x50\x02\x00\x00\x68\x60\x00\x00\x50\x40\x40\x40\x40\x40\x40\x40\x40 Linux S390
>0x10008 string S390EP
>>0x10428 bequad >0
>>>(0x10428.Q) string >\0 \b, version %s
Reported-by: Petr Tesarik <ptesarik@suse.com>
Suggested-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/boot/Makefile')
| -rw-r--r-- | arch/s390/boot/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/boot/Makefile b/arch/s390/boot/Makefile index 7cba96e7587b..4cf0bddb7d92 100644 --- a/arch/s390/boot/Makefile +++ b/arch/s390/boot/Makefile @@ -36,7 +36,7 @@ CFLAGS_sclp_early_core.o += -I$(srctree)/drivers/s390/char obj-y := head.o als.o startup.o mem_detect.o ipl_parm.o ipl_report.o obj-y += string.o ebcdic.o sclp_early_core.o mem.o ipl_vmparm.o cmdline.o -obj-y += ctype.o text_dma.o +obj-y += version.o ctype.o text_dma.o obj-$(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) += uv.o obj-$(CONFIG_RELOCATABLE) += machine_kexec_reloc.o obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o |