1 files changed, 131 insertions, 0 deletions
diff --git a/tools/libxc/xc_evtchn.c b/tools/libxc/xc_evtchn.c
new file mode 100644
index 0000000000..624f5b1c15
--- /dev/null
+++ b/tools/libxc/xc_evtchn.c
@@ -0,0 +1,131 @@
+/******************************************************************************
+ * xc_evtchn.c
+ * 
+ * API for manipulating and accessing inter-domain event channels.
+ * 
+ * Copyright (c) 2004, K A Fraser.
+ */
+
+#include "xc_private.h"
+
+
+static int do_evtchn_op(int xc_handle, evtchn_op_t *op)
+{
+    int ret = -1;
+    privcmd_hypercall_t hypercall;
+
+    hypercall.op     = __HYPERVISOR_event_channel_op;
+    hypercall.arg[0] = (unsigned long)op;
+
+    if ( mlock(op, sizeof(*op)) != 0 )
+    {
+        PERROR("Could not lock memory for Xen hypercall");
+        goto out1;
+    }
+
+    if ( (ret = do_xen_hypercall(xc_handle, &hypercall)) < 0 )
+        goto out2;
+
+ out2: (void)munlock(op, sizeof(*op));
+ out1: return ret;
+}
+
+
+int xc_evtchn_bind_interdomain(int xc_handle,
+                               u32 dom1,
+                               u32 dom2,
+                               int *port1,
+                               int *port2)
+{
+    evtchn_op_t op;
+    int         rc;
+
+    op.cmd = EVTCHNOP_bind_interdomain;
+    op.u.bind_interdomain.dom1 = (domid_t)dom1;
+    op.u.bind_interdomain.dom2 = (domid_t)dom2;
+   
+    if ( (rc = do_evtchn_op(xc_handle, &op)) == 0 )
+    {
+        if ( port1 != NULL )
+            *port1 = op.u.bind_interdomain.port1;
+        if ( port2 != NULL )
+            *port2 = op.u.bind_interdomain.port2;
+    }
+    
+    return rc;
+}
+
+
+int xc_evtchn_bind_virq(int xc_handle,
+                        int virq,
+                        int *port)
+{
+    evtchn_op_t op;
+    int         rc;
+
+    op.cmd = EVTCHNOP_bind_virq;
+    op.u.bind_virq.virq = (u32)virq;
+   
+    if ( (rc = do_evtchn_op(xc_handle, &op)) == 0 )
+    {
+        if ( port != NULL )
+            *port = op.u.bind_virq.port;
+    }
+    
+    return rc;
+}
+
+
+int xc_evtchn_close(int xc_handle,
+                    u32 dom,
+                    int port)
+{
+    evtchn_op_t op;
+    op.cmd = EVTCHNOP_close;
+    op.u.close.dom  = (domid_t)dom;
+    op.u.close.port = port;
+    return do_evtchn_op(xc_handle, &op);
+}
+
+
+int xc_evtchn_send(int xc_handle,
+                   int local_port)
+{
+    evtchn_op_t op;
+    op.cmd = EVTCHNOP_send;
+    op.u.send.local_port = local_port;
+    return do_evtchn_op(xc_handle, &op);
+}
+
+
+int xc_evtchn_status(int xc_handle,
+                     u32 dom,
+                     int port,
+                     xc_evtchn_status_t *status)
+{
+    evtchn_op_t op;
+    int         rc;
+
+    op.cmd = EVTCHNOP_status;
+    op.u.status.dom  = (domid_t)dom;
+    op.u.status.port = port;
+   
+    if ( (rc = do_evtchn_op(xc_handle, &op)) == 0 )
+    {
+        switch ( status->status = op.u.status.status )
+        {
+        case EVTCHNSTAT_interdomain:
+            status->u.interdomain.dom  = (u32)op.u.status.u.interdomain.dom;
+            status->u.interdomain.port = op.u.status.u.interdomain.port;
+            break;
+        case EVTCHNSTAT_pirq:
+            status->u.pirq = op.u.status.u.pirq;
+            break;
+        case EVTCHNSTAT_virq:
+            status->u.virq = op.u.status.u.virq;
+            break;
+        }
+    }
+    
+    return rc;
+}