s390/head: initialize all new psws

Initialize all new psws with disabled wait psws, except for the restart new
psw. This way every unexpected exception, svc, machine check, or interrupt
is handled properly.

Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S
index 0b2cec4..a63f7de 100644 (file)
--- a/arch/s390/boot/head.S
+++ b/arch/s390/boot/head.S
@@ -64,14 +64,22 @@ __HEAD
        .long   0x02000690,0x60000050
        .long   0x020006e0,0x20000050
 
-       .org    __LC_RST_NEW_PSW                # 0x1a0
+# The restart psw points to ipl_entry, which allows to load a kernel image
+# into memory and starting it by a psw restart on any cpu.
+# All other default psw new locations contain a disabled wait psw where the
+# address indicates which psw was loaded.
+       .org    __LC_RST_NEW_PSW
        .quad   0,IPL_START
-       .org    __LC_EXT_NEW_PSW                # 0x1b0
-       .quad   0x0002000180000000,0x1b0        # disabled wait
-       .org    __LC_PGM_NEW_PSW                # 0x1d0
-       .quad   0x0002000180000000,0x1d0        # disabled wait
-       .org    __LC_IO_NEW_PSW                 # 0x1f0
-       .quad   0x0002000180000000,0x1f0        # disabled wait
+       .org    __LC_EXT_NEW_PSW
+       .quad   0x0002000180000000,__LC_EXT_NEW_PSW
+       .org    __LC_SVC_NEW_PSW
+       .quad   0x0002000180000000,__LC_SVC_NEW_PSW
+       .org    __LC_PGM_NEW_PSW
+       .quad   0x0002000180000000,__LC_PGM_NEW_PSW
+       .org    __LC_MCK_NEW_PSW
+       .quad   0x0002000180000000,__LC_MCK_NEW_PSW
+       .org    __LC_IO_NEW_PSW
+       .quad   0x0002000180000000,__LC_IO_NEW_PSW
 
        .org    IPL_START
 ipl_start: