1 files changed, 93 insertions, 0 deletions
diff --git a/linux-2.4.26-xen-sparse/include/asm-xen/evtchn.h b/linux-2.4.26-xen-sparse/include/asm-xen/evtchn.h
new file mode 100644
index 0000000000..128d766a34
--- /dev/null
+++ b/linux-2.4.26-xen-sparse/include/asm-xen/evtchn.h
@@ -0,0 +1,93 @@
+/******************************************************************************
+ * evtchn.h
+ * 
+ * Communication via Xen event channels.
+ * Also definitions for the device that demuxes notifications to userspace.
+ * 
+ * Copyright (c) 2004, K A Fraser
+ */
+
+#ifndef __ASM_EVTCHN_H__
+#define __ASM_EVTCHN_H__
+
+#include <linux/config.h>
+#include <asm/hypervisor.h>
+#include <asm/ptrace.h>
+#include <asm/synch_bitops.h>
+#include <asm/hypervisor-ifs/event_channel.h>
+
+/*
+ * LOW-LEVEL DEFINITIONS
+ */
+
+/* Entry point for notifications into Linux subsystems. */
+void evtchn_do_upcall(struct pt_regs *regs);
+
+/* Entry point for notifications into the userland character device. */
+void evtchn_device_upcall(int port);
+
+static inline void mask_evtchn(int port)
+{
+    shared_info_t *s = HYPERVISOR_shared_info;
+    synch_set_bit(port, &s->evtchn_mask[0]);
+}
+
+static inline void unmask_evtchn(int port)
+{
+    shared_info_t *s = HYPERVISOR_shared_info;
+
+    synch_clear_bit(port, &s->evtchn_mask[0]);
+
+    /*
+     * The following is basically the equivalent of 'hw_resend_irq'. Just like
+     * a real IO-APIC we 'lose the interrupt edge' if the channel is masked.
+     */
+    if (  synch_test_bit        (port,    &s->evtchn_pending[0]) && 
+         !synch_test_and_set_bit(port>>5, &s->evtchn_pending_sel) )
+    {
+        s->vcpu_data[0].evtchn_upcall_pending = 1;
+        if ( !s->vcpu_data[0].evtchn_upcall_mask )
+            evtchn_do_upcall(NULL);
+    }
+}
+
+static inline void clear_evtchn(int port)
+{
+    shared_info_t *s = HYPERVISOR_shared_info;
+    synch_clear_bit(port, &s->evtchn_pending[0]);
+}
+
+static inline void clear_evtchn_exception(int port)
+{
+    shared_info_t *s = HYPERVISOR_shared_info;
+    synch_clear_bit(port, &s->evtchn_exception[0]);
+}
+
+static inline void notify_via_evtchn(int port)
+{
+    evtchn_op_t op;
+    op.cmd = EVTCHNOP_send;
+    op.u.send.local_port = port;
+    (void)HYPERVISOR_event_channel_op(&op);
+}
+
+/*
+ * CHARACTER-DEVICE DEFINITIONS
+ */
+
+#define PORT_NORMAL    0x0000
+#define PORT_EXCEPTION 0x8000
+#define PORTIDX_MASK   0x7fff
+
+/* /dev/xen/evtchn resides at device number major=10, minor=200 */
+#define EVTCHN_MINOR 200
+
+/* /dev/xen/evtchn ioctls: */
+/* EVTCHN_RESET: Clear and reinit the event buffer. Clear error condition. */
+#define EVTCHN_RESET  _IO('E', 1)
+/* EVTCHN_BIND: Bind to teh specified event-channel port. */
+#define EVTCHN_BIND   _IO('E', 2)
+/* EVTCHN_UNBIND: Unbind from the specified event-channel port. */
+#define EVTCHN_UNBIND _IO('E', 3)
+
+#endif /* __ASM_EVTCHN_H__ */