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s390/sclp: do not use static sccbs

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The sccbs for init/read/sdias/early have to be located below 2 GB, and
they are currently defined as a static buffer.

With a relocatable kernel that could reside at any place in memory, this
will no longer guarantee the location below 2 GB, so use a dynamic
GFP_DMA allocation instead.

The sclp_early_sccb buffer needs special handling, as it can be used
very early, and by both the decompressor and also the decompressed
kernel. Therefore, a fixed 4 KB buffer is introduced at 0x11000, the
former PARMAREA_END. The new PARMAREA_END is now 0x12000, and it is
renamed to HEAD_END, as it is rather the end of head.S and not the end
of the parmarea.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Reviewed-by: Philipp Rudo <prudo@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer
2019-04-08 12:49:58 +02:00
committed by Martin Schwidefsky
parent fd3d2742d5
commit 087c4d7423
9 changed files with 70 additions and 56 deletions
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5
arch/s390/include/asm/setup.h
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@@ -12,7 +12,10 @@
#define EP_OFFSET 0x10008
#define EP_STRING "S390EP"
#define PARMAREA 0x10400
#define PARMAREA_END 0x11000
#define EARLY_SCCB_OFFSET 0x11000
#define HEAD_END 0x12000
#define EARLY_SCCB_SIZE PAGE_SIZE
/*
* Machine features detected in early.c