1 files changed, 14 insertions, 2 deletions

diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index fc8bf5e285f6..2710e66fefba 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -346,6 +346,13 @@ iplstart:
         la    %r2,.Lreset              
         lhi   %r3,26
         diag  %r2,%r3,8
+        la    %r5,.Lirb
+        stsch 0(%r5)                           # check if irq is pending
+        tm    30(%r5),0x0f                     # by verifying if any of the
+        bnz   .Lwaitforirq                     # activity or status control
+        tm    31(%r5),0xff                     # bits is set in the schib
+        bz    .Lnoreset
+.Lwaitforirq:
         mvc   0x78(8),.Lrdrnewpsw              # set up IO interrupt psw
 .Lwaitrdrirq:
         lpsw  .Lrdrwaitpsw
@@ -535,8 +542,13 @@ startup:basr  %r13,0                     # get base
         lhi   %r1,0
         icm   %r1,3,.Lscpincr1-PARMAREA(%r4) # use this one if != 0
         jnz   .Lscnd
-        l     %r1,.Lscpincr2-PARMAREA+4(%r4) # otherwise use this one
+        lhi   %r1,0x800                 # otherwise report 2GB
 .Lscnd:
+        lhi   %r3,0x800                 # limit reported memory size to 2GB
+        cr    %r1,%r3
+        jl    .Lno2gb
+        lr    %r1,%r3
+.Lno2gb:
         xr    %r3,%r3                   # same logic
         ic    %r3,.Lscpa1-PARMAREA(%r4)
         chi   %r3,0x00
@@ -765,7 +777,7 @@ _stext:	basr  %r13,0                    # get base
 
 # check control registers
         stctl  %c0,%c15,0(%r15)
-        oi     2(%r15),0x20             # enable sigp external interrupts
+        oi     2(%r15),0x40             # enable sigp emergency signal
         oi     0(%r15),0x10             # switch on low address protection
         lctl   %c0,%c15,0(%r15)