s390x assembly pack: cache capability query results.
IBM argues that in certain scenarios capability query is really
expensive. At the same time it's asserted that query results can
be safely cached, because disabling CPACF is incompatible with
reboot-free operation.
Reviewed-by: Tim Hudson <tjh@openssl.org>
diff --git a/crypto/modes/asm/ghash-s390x.pl b/crypto/modes/asm/ghash-s390x.pl
index a46f3eb..8c3ce69 100644
--- a/crypto/modes/asm/ghash-s390x.pl
+++ b/crypto/modes/asm/ghash-s390x.pl
@@ -85,9 +85,7 @@
tmhl %r0,0x4000 # check for message-security-assist
jz .Lsoft_gmult
lghi %r0,0
- la %r1,16($sp)
- .long 0xb93e0004 # kimd %r0,%r4
- lg %r1,24($sp)
+ lg %r1,24(%r1) # load second word of kimd capabilities vector
tmhh %r1,0x4000 # check for function 65
jz .Lsoft_gmult
stg %r0,16($sp) # arrange 16 bytes of zero input
