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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2019-04-01 19:10:45 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-04-10 17:47:09 +0200 |
| commit | bf9921a9c15bad089c08b94c300a6cafa035a612 (patch) | |
| tree | dd69b006096cdae6c93cb892d892b00dc7e63e68 /arch/s390/include/asm | |
| parent | 46a984ffb86c8542fa510656fa8cb33befe8ee8f (diff) | |
| download | linux-bf9921a9c15bad089c08b94c300a6cafa035a612.tar.bz2 | |
s390: introduce .boot.preserved.data section
Introduce .boot.preserve.data section which is similar to .boot.data and
"shared" between the decompressor code and the decompressed kernel. The
decompressor will store values in it, and copy over to the decompressed
image before starting it. This method allows to avoid using pre-defined
addresses and other hacks to pass values between those boot phases.
Unlike .boot.data section .boot.preserved.data is NOT a part of init data,
and hence will be preserved for the kernel life time.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/sections.h | 7 | ||||
| -rw-r--r-- | arch/s390/include/asm/vmlinux.lds.h | 13 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/s390/include/asm/sections.h b/arch/s390/include/asm/sections.h index 7afe4620685c..29e55739b516 100644 --- a/arch/s390/include/asm/sections.h +++ b/arch/s390/include/asm/sections.h @@ -16,4 +16,11 @@ */ #define __bootdata(var) __section(.boot.data.var) var +/* + * .boot.preserved.data is similar to .boot.data, but it is not part of the + * .init section and thus will be preserved for later use in the decompressed + * kernel. + */ +#define __bootdata_preserved(var) __section(.boot.preserved.data.var) var + #endif diff --git a/arch/s390/include/asm/vmlinux.lds.h b/arch/s390/include/asm/vmlinux.lds.h index 2d127f900352..cbe670a6861b 100644 --- a/arch/s390/include/asm/vmlinux.lds.h +++ b/arch/s390/include/asm/vmlinux.lds.h @@ -18,3 +18,16 @@ *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.boot.data*))) \ __boot_data_end = .; \ } + +/* + * .boot.preserved.data is similar to .boot.data, but it is not part of the + * .init section and thus will be preserved for later use in the decompressed + * kernel. + */ +#define BOOT_DATA_PRESERVED \ + . = ALIGN(PAGE_SIZE); \ + .boot.preserved.data : { \ + __boot_data_preserved_start = .; \ + *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.boot.preserved.data*))) \ + __boot_data_preserved_end = .; \ + } |