s390: add initial 64-bit restart PSW

To be able to start a kernel image loaded into memory with a
PSW restart, place a 64-bit restart PSW at 0x1a0 in absolute
lowcore.

Suggested-by: Dominik Klein <dominik.klein@linux.ibm.com>
Tested-by: Dominik Klein <dominik.klein@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index f721913b73f10c10c7a89d9a400dacb8ff42902a..f1cdca8ad3cc288665252a68e8a4cf1fb8d2dcfc 100644 (file)
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -60,6 +60,9 @@ __HEAD
        .long   0x02000690,0x60000050
        .long   0x020006e0,0x20000050
 
+       .org    0x1a0
+       .quad   0,iplstart
+
        .org    0x200
 
 #