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Diffstat (limited to 'qemu/hw/s390x/s390-virtio-hcall.c')
-rw-r--r--qemu/hw/s390x/s390-virtio-hcall.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/qemu/hw/s390x/s390-virtio-hcall.c b/qemu/hw/s390x/s390-virtio-hcall.c
new file mode 100644
index 000000000..c7bdc2005
--- /dev/null
+++ b/qemu/hw/s390x/s390-virtio-hcall.c
@@ -0,0 +1,40 @@
+/*
+ * Support for virtio hypercalls on s390
+ *
+ * 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 "cpu.h"
+#include "hw/s390x/s390-virtio.h"
+
+#define MAX_DIAG_SUBCODES 255
+
+static s390_virtio_fn s390_diag500_table[MAX_DIAG_SUBCODES];
+
+void s390_register_virtio_hypercall(uint64_t code, s390_virtio_fn fn)
+{
+ assert(code < MAX_DIAG_SUBCODES);
+ assert(!s390_diag500_table[code]);
+
+ s390_diag500_table[code] = fn;
+}
+
+int s390_virtio_hypercall(CPUS390XState *env)
+{
+ s390_virtio_fn fn;
+
+ if (env->regs[1] < MAX_DIAG_SUBCODES) {
+ fn = s390_diag500_table[env->regs[1]];
+ if (fn) {
+ env->regs[2] = fn(&env->regs[2]);
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}