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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2019-04-08 12:49:58 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-29 10:47:10 +0200
commit087c4d7423989b110c3312592db05acc009a5d58 (patch)
tree62ff0f5c1121de80e098cbe317a287b4329c2194 /arch/s390/boot
parentfd3d2742d558d33560ec5dfee3001e561b5c0822 (diff)
s390/sclp: do not use static sccbs
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>
Diffstat (limited to 'arch/s390/boot')
-rw-r--r--arch/s390/boot/head.S5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index d585c4dbdac7..c6b4b4c5dd58 100644
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -336,4 +336,7 @@ ENTRY(startup_kdump)
.byte "root=/dev/ram0 ro"
.byte 0
- .org 0x11000
+ .org EARLY_SCCB_OFFSET
+ .fill 4096
+
+ .org HEAD_END