diff options
| author | Cornelia Huck <cohuck@redhat.com> | 2018-05-02 14:52:21 +0200 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2018-05-02 15:35:19 +0200 |
| commit | 63d8b5ace31c1e1f3996fe4cd551d6d377594d5a (patch) | |
| tree | e522b52214fcb7f5a19117266e9528f25995d952 /pc-bios | |
| parent | c4942ee94271052b68125ec8c06e8c71a967aad3 (diff) | |
s390-ccw: force diag 308 subcode to unsigned long
We currently pass an integer as the subcode parameter. However,
the upper bits of the register containing the subcode need to
be 0, which is not guaranteed unless we explicitly specify the
subcode to be an unsigned long value.
Fixes: d046c51dad3 ("pc-bios/s390-ccw: Get device address via diag 308/6")
Cc: qemu-stable@nongnu.org
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'pc-bios')
| -rw-r--r-- | pc-bios/s390-ccw/iplb.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/pc-bios/s390-ccw/iplb.h b/pc-bios/s390-ccw/iplb.h index 5357a36d51..ded20c834e 100644 --- a/pc-bios/s390-ccw/iplb.h +++ b/pc-bios/s390-ccw/iplb.h @@ -101,10 +101,11 @@ static inline bool manage_iplb(IplParameterBlock *iplb, bool store) { register unsigned long addr asm("0") = (unsigned long) iplb; register unsigned long rc asm("1") = 0; + unsigned long subcode = store ? 6 : 5; asm volatile ("diag %0,%2,0x308\n" : "+d" (addr), "+d" (rc) - : "d" (store ? 6 : 5) + : "d" (subcode) : "memory", "cc"); return rc == 0x01; } |