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s390: introduce .boot.data section

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Introduce .boot.data section which is "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.

.boot.data section is a part of init data, and will be freed after kernel
initialization is complete.

For uncompressed kernel image, .boot.data section is basically the same
as .init.data

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik
2018-04-10 14:14:02 +02:00
committed by Martin Schwidefsky
parent 7516fc11e4
commit d1b52a4388
6 changed files with 56 additions and 4 deletions
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12
arch/s390/include/asm/sections.h
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@@ -4,4 +4,16 @@
#include <asm-generic/sections.h>
/*
* .boot.data section contains variables "shared" between the decompressor and
* the decompressed kernel. The decompressor will store values in them, and
* copy over to the decompressed image before starting it.
*
* Each variable end up in its own intermediate section .boot.data.<var name>,
* those sections are later sorted by alignment + name and merged together into
* final .boot.data section, which should be identical in the decompressor and
* the decompressed kernel (that is checked during the build).
*/
#define __bootdata(var) __section(.boot.data.var) var
#endif