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authorGerald Schaefer <geraldsc@de.ibm.com>2006-09-20 15:59:44 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-09-20 15:59:44 +0200
commit6c2a9e6df60478e712f3c3d98b5047778a82a3d7 (patch)
tree6768eb3991f4f1616b211a21ccf1b8e27820ae79 /arch/s390/kernel/head64.S
parentd02765d1af743567398eb6d523dea0ba5e5e7e8e (diff)
downloadop-kernel-dev-6c2a9e6df60478e712f3c3d98b5047778a82a3d7.zip
op-kernel-dev-6c2a9e6df60478e712f3c3d98b5047778a82a3d7.tar.gz
[S390] Use alternative user-copy operations for new hardware.
This introduces new user-copy operations which are optimized for copying more than 256 Bytes on new hardware. Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/head64.S')
-rw-r--r--arch/s390/kernel/head64.S13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 1ebaa33..a8bdd96 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -250,6 +250,19 @@ startup_continue:
oi 7(%r12),0x80 # set IDTE flag
0:
+#
+# find out if we have the MVCOS instruction
+#
+ la %r1,0f-.LPG1(%r13) # set program check address
+ stg %r1,__LC_PGM_NEW_PSW+8
+ .short 0xc800 # mvcos 0(%r0),0(%r0),%r0
+ .short 0x0000
+ .short 0x0000
+0: tm 0x8f,0x13 # special-operation exception?
+ bno 1f-.LPG1(%r13) # if yes, MVCOS is present
+ oi 6(%r12),2 # set MVCOS flag
+1:
+
lpswe .Lentry-.LPG1(13) # jump to _stext in primary-space,
# virtual and never return ...
.align 16
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