s390: Channel I/O basic definitions.

Basic channel I/O structures and helper function.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 36 insertions, 0 deletions

diff --git a/target-s390x/ioinst.c b/target-s390x/ioinst.c
new file mode 100644
index 0000000000..06a16eec0a
--- /dev/null
+++ b/target-s390x/ioinst.c
@@ -0,0 +1,36 @@
+/*
+ * I/O instructions for S/390
+ *
+ * Copyright 2012 IBM Corp.
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at
+ * your option) any later version. See the COPYING file in the top-level
+ * directory.
+ */
+
+#include <sys/types.h>
+
+#include "cpu.h"
+#include "ioinst.h"
+
+int ioinst_disassemble_sch_ident(uint32_t value, int *m, int *cssid, int *ssid,
+                                 int *schid)
+{
+    if (!IOINST_SCHID_ONE(value)) {
+        return -EINVAL;
+    }
+    if (!IOINST_SCHID_M(value)) {
+        if (IOINST_SCHID_CSSID(value)) {
+            return -EINVAL;
+        }
+        *cssid = 0;
+        *m = 0;
+    } else {
+        *cssid = IOINST_SCHID_CSSID(value);
+        *m = 1;
+    }
+    *ssid = IOINST_SCHID_SSID(value);
+    *schid = IOINST_SCHID_NR(value);
+    return 0;
+}