[S390] Add processor type march=z10 and a processor type safety check.

This patch adds the code generation option for IBM System z10 and
adds a check in head[31,64].S to prevents the execution of a kernel
compiled for a new processor type on an old machine.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index e6efc1277b04..7a18d2380e2c 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -230,6 +230,14 @@ config MARCH_Z9_109
           Class (z9 BC). The kernel will be slightly faster but will not
           work on older machines such as the z990, z890, z900, and z800.
 
+config MARCH_Z10
+        bool "IBM System z10"
+        help
+          Select this to enable optimizations for IBM System z10. The
+          kernel will be slightly faster but will not work on older
+          machines such as the z990, z890, z900, z800, z9-109, z9-ec
+          and z9-bc.
+
 endchoice
 
 config PACK_STACK