[S390] fix boot failures with compressed kernels
Fix two bugs with the kernel image compression:
1) reset the bss section of the compressed vmlinux
2) clear the high half of the registers for 64 bit early enough
for the decompression step
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index ca4a62b..9d1f767 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -517,7 +517,10 @@
lhi %r1,2 # mode 2 = esame (dump)
sigp %r1,%r0,0x12 # switch to esame mode
sam64 # switch to 64 bit mode
+ larl %r13,4f
+ lmh %r0,%r15,0(%r13) # clear high-order half
jg startup_continue
+4: .fill 16,4,0x0
#else
mvi __LC_AR_MODE_ID,0 # set ESA flag (mode 0)
l %r13,4f-.LPG0(%r13)