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authorGerald Schaefer <gerald.schaefer@de.ibm.com>2019-02-03 21:37:20 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-29 10:47:10 +0200
commita80313ff91abda67641dc33bed97f6bcc5e9f6a4 (patch)
treefce012f16f783ae75583b9f2ca3f0925abff7216 /arch/s390/include/asm/linkage.h
parent087c4d7423989b110c3312592db05acc009a5d58 (diff)
s390/kernel: introduce .dma sections
With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. 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/include/asm/linkage.h')
-rw-r--r--arch/s390/include/asm/linkage.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/include/asm/linkage.h b/arch/s390/include/asm/linkage.h
index 1b95da3fdd64..7f22262b0e46 100644
--- a/arch/s390/include/asm/linkage.h
+++ b/arch/s390/include/asm/linkage.h
@@ -28,5 +28,12 @@
.long (_target) - . ; \
.previous
+#define EX_TABLE_DMA(_fault, _target) \
+ .section .dma.ex_table, "a" ; \
+ .align 4 ; \
+ .long (_fault) - . ; \
+ .long (_target) - . ; \
+ .previous
+
#endif /* __ASSEMBLY__ */
#endif

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