[S390] Use alternative user-copy operations for new hardware.

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / s390 / kernel / head64.S

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 1ebaa33..a8bdd96 100644 (file)
--- 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